| Miniproposals | ||||||||||||
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| Operators | |
| Session leader(s): | Robert Granetz,Geoff Olynyk |
| Physics operator(s): | Jim Irby |
| Engineering operator(s): | Sam Pierson,Bill Parkin,Bill Byford |
| Engineering Operator Run Comment |
| MP 675 Initial disruption mitigation experiments with two gas jets |
| Session Leader Plans |
| Entered: Feb 1 2012 04:36:10:670PM |
| Author: Geoff Olynyk |
| Session leader plan for run 1120202 (Thursday, February 2, 2012)
MP 675 - "Initial disruption mitigation experiments with two gas jets", run 1 of 2. G.M. Olynyk Objectives: (a) Commission second disruption mitigation gas jet and toroidal radiation asymmetry diagnostic (DMBolo). (b) Begin to study the performance of massive gas injection disruption mitigation with two gas jets, especially as regards toroidal radiation asymmetry during thermal quench. Gas request: - D2 majority fuelling. - Load Ar into B-side lower gas puff in order to get core rotation from HiReX Jr. Essential diagnostics & systems: - Fast magnetics - at least the low-n coils on stalks. [T. Golfinopoulos] - Two-color interferometer [J. Irby] - ICRF - 1 MW, from E-port 2-strap antenna (transmitter #2) [S.J. Wukitch, Y. Lin] - X-ray tomography - at least array 3 [R.S. Granetz, I. Faust] - Core CXRS - impurity temperature and rotation [I. Bespamyatnov] - FRCECE - [P. Phillips, W. Rowan (U. Texas)] - Foil bolometry [M.L. Reinke] - AXUV diode arrays AXA, AXJ with gains turned down for disruption mitigation [M.L. Reinke] - Disruption mitigation gas jets [R.S. Granetz] - Fast AXUV diode toroidal array (DMBolo) [G.M. Olynyk] Desired diagnostics & systems: - Divertor thermocouples [D. Brunner] - IR imaging - Already discussed, this will not be available for this run [J. Terry] - Core rotation from HiReX Jr [J. Rice, Y. Podpaly] - Core Thomson temperature and density [J. Hughes] - DNB [R.S. Granetz] - MSE [R.T. Mumgaard, S. Scott] Important note for diagnosticians: After disruption mitigation gas jets are fired, torus pressures can rise as high as 1 torr. If you have sensitive diagnostics, these should have their protective gate valves closed. PhysOp instructions: We will be running identical, steady target plasmas all day, with the variation coming from the gas jet system. Requested plasma parameters are as follows: - Target plasma 1120117015 but with X-point moved in radially by 1 cm to lower strike point on outer divertor. (rxl in by 1 cm) - Ip 1.0 MA - Btor 5.4 T - nl04 1.0e20 m-2 Auxiliary system setup instructions: - ICRF request: 1 MW on E-antenna (transmitter #2), turning on at t=0.800 s, remaining on until (induced) disruption at t=1.000 s - Timing of DNB pulses should be set so that the DNB is off when the gas jets fire at t=1.000 s. For example, 60 ms on, 40 ms off (100 ms between pulse starts) at 0.520 s, 0.620 s, 0.720 s, 0.820 s, 0.920 s, 1.020 s, etc. would work. - Load disruption mitigation gas jet plenums with mixture of 85% He, 15% Ar for both of B-port (old) and F-port (new) gas jets. Run plan: 0. (This will possibly be done before the run, on Wednesday 2012-02-01) Determination of relative timing offset between old (B-port) and new (F-port) gas jets without plasma. Fire gas jets individually and look at pressure pulse on fast pressure transducers on injection pipes. Record relative offset so that jets can be timed relative to both jets arriving at plasma edge at the same time. (No plasma for this phase.) 1. Initial operation, and adjustment of gains on DMBolo. Load target and make field/current/shape adjustments as necessary. Fire old (B-port) and new (F-port) gas jets into plasma at t=1.000 s, twice each. In between shots, this may require cell access to adjust gain on DMBolo system. Refine relative timing between B-port and F-port gas jets. (4 shots) 2. Simultaneous operation of two gas jets. Fire both gas jets at the same time into identical plasma. Repeat three times to figure out any unexpected offsets in the timing of each jet. Attempt to get the two gas jets to fire at the exact same time. Up to four shots allocated for this. (If it is attained earlier, move on to step 3.) (3-4 shots) 3. Staggered gas jet operation scan. This is a scan of the advancement time between triggering to each gas jet. Define delta_T = t_trig_F - t_trig_B - offset_FB. That is, delta_T is the length of time between the triggering signal being sent to the B-port and the F-port gas jets, corrected for the relative offset determined in earlier steps, such that delta_T = 0 means that the two gas jets arrive at the plasma at the same time. Fire gas jets into identical plasmas (as described above in PhysOp instructions) with delta_T = -2.0, -1.0, +1.0, and +2.0 ms. (delta_T = 0 was already covered in the last step.) (4-6 shots) 4. q-scan. Repeat earlier steps with B-port gas jet alone; F-port gas jet alone; both gas jets at the same time (delta_T = 0); and both gas jets with delta_T = +/- 1.0 ms at 5.4 T with currents of 600 kA, 800 kA, and 1.2 MA. Adjust density to maintain fixed T_e. This step will be completed on the first day only if time permits. ~9 shots |
| Physics Operators Plans |
| Entered: Feb 1 2012 04:47:51:277PM |
| Author: Jim Irby |
| -----------------
Engineering Setup ----------------- Run begins at 09:00 and ends at 17:00 Power systems as on: 1120117015 Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid Enabled Gas setup: Fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid Enabled (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill NINJA with 10 psi D2 DISABLED Enable gate-valves and shutters: ECE, VUV, HiREX Sr, Xeus, Loeus Leave z-bolo shutter as is (should be open) Torvac gatevalve toggle (yes/no): no Boronization(yes/no): no Overnight ECDC (yes/no): yes ICRF(yes/no): yes LH(yes/no): no Cryopump (yes/no): no DNB (yes/no): yes Vessel temperature: 35/35/35 ------------------------------ ECDC Parameters (if requested) ------------------------------ gas and pressure: D2 at 2e-4 Torr sweep: 44/45/103 cm scan: 20/120 s |
| Session Leader Summaries |
| Entered: Feb 2 2012 05:14:37:350PM |
| Author: Geoff Olynyk |
| Session leader summary for run 1120202 (Thursday, February 2, 2012)
MP 675 - "Initial disruption mitigation experiments with two gas jets", run 1 of 2. G.M. Olynyk Today was extremely successful. We commissioned the second (F-port) massive gas injection disruption mitigation gas jet system, confirmed that the original (B-port) gas jet system still works, and got a lot of good data for analysis from the new disruption mitigation bolometry (DMBolo) system. The start of the run was delayed by about 60 minutes due to the alternator getting too cold over the maintenance day, and then by another ~15 minutes due to a software problem with the EngOps widget/panel (changing the start of the fizzle detector was not working). Thus, we took our first plasma shot (003) around 10:15 am, and from then on had no more system problems. The MGI system was exercised from shot 004 onwards. We ran identical plasmas all day, except that shots 003-011 had Btor=5.42 T, and then we changed to Btor=5.6 T in order to push the FRCECE resonance layers out to r/a = 1.0. (With the lower Btor, they were only out to about r/a=0.9.) Shots 004-009 were with single MGI gas jets in order to refine the relative timing and duration of the jets (007 was a fizzle but the B-jet still fired and thus we could still get timing information from it). From then on, shots 010-023 used both gas jets. Aside from shot 004, when channel 2 had a dead op-amp on the transimpedance board, the DMBolo system seemed to be working well all day. There are lots of data to analyze! Lessons learned: - Relative timing of gas jets to get same gas front arrival: for 55 bar plenum pressure, you want to trigger the F-port gas jet about 1.0 ms before the B-port gas jet. This seems to be reproducible to within about 0.1 ms. - Gas jet duration to get same injected amount: this was figured from the torus pressure change when firing one gas jet or the other. For 55 bar plenum pressure, you want to use a duration of 1.25 ms for the B-port gas jet and 3.0 ms for the F-port gas jet. - With the double gas jet shots, it takes a long time to pump out the torus, and so the inter-shot delay is longer than in a normal run. We got started late - didn't take our first plasma shot until about 10:15 am (no MGI on this shot). First MGI shot was 004 at 10:30 am. Shots 004, 005, 006, 007, 008, 009 used a single gas jet. (007 was a fizzle but the B-jet still fired.) All shots from 010 on used both gas jets. We took shot 023 at about 5:07 pm. So that is 14 shots in about 6.5 hours. - I think we can now say that mitigated disruption shots do NOT lead to fizzles on the next shot. This has been confirmed by this run as well as run 1090925. They do, however, delay the next shot because the torus has to be pumped down, as discussed above. "Scorecard" No-power shots 2 (shots 001, 002) Fizzles, no MGI 0 Fizzles with MGI 1 (shot 007) Plasma, no MGI 1 (shot 003) Plasma, B port jet only 3 (shots 004, 008, 009) Plasma, F port jet only 2 (shots 005, 006) Plasma, both MGI jets 14 (shots 010-023) Shot summaries
001 No plasma. Test of whether MGI system gate valves are automatically opening
in the shot cycle (supposed to be at t = -3.0 s). Gas jets not
fired on this shot. Gate valves worked as expected.
002 No plasma. Test of F-port gas valve interlocking and pressure transducer.
Interlock failed so gas jet didn't fire.
003 Plasma, 1 MW ICRF but had lots of faults. No MGI gas jets (as expected -
did not fire them). Rampdown disruption at t = 1.65 s.
004 Plasma. 1 MW ICRF successful. Successfully fired B-port gas jet at
t = 1.000 s with duration 1.9 ms.
005 Plasma. 1 MW ICRF successful. Fired F-port gas jet at t = 1.000 s but not
much gas made it through.
006 Plasma. 1 MW ICRF successful with no faults. Successfully fired F-port gas
jet at t = 1.000 s. More gas made it through (about half what was injected
through B-port jet on shot 004).
007 Fizzle. B-port gas jet only fired, with duration 1.4 ms (compare to shot
004 when duration was 1.9 ms). Still got more gas through on this shot than
we got from F-port jet on shot 6.
008 Plasma. 1 MW ICRF with no faults. B-port gas jet successfully fired. Short
duration (1.1 ms). Not much gas made it through (torus pressure change 40
mtorr).
009 Plasma. 1 MW ICRF with no faults. B-port gas jet only successfully fired.
Duration 1.28 ms puts a sufficient amount of gas through.
010 Plasma. 1 MW ICRF with no faults. Both gas jets successfully fired, with
F jet triggering 1.1 ms earlier than B jet in order to get the gas to hit
the plasma edge at the same time.
011 Plasma. 1 MW ICRF with one fault, but was only off for a short time. Both
gas jets fired successfully as in shot 010. Raised toroidal field to 5.6 T
on this shot in order to pull FRCECE resonance layer locations out to the
very edge of the plasma.
012 Plasma. 1 MW ICRF, no faults. Both gas jets fired successfully with timing
such that the gas hits the plasma at the same time.
013 Plasma. 1 MW ICRF, no faults. Both MGI gas jets fired successfully. Timing
was such that F jet hit the plasma 0.5 ms before B jet.
014 Plasma. 1 MW ICRF, no faults. Both MGI gas jets fired successfully. Timing
was such that F jet hit the plasma 1.0 ms before B jet.
015 Plasma. 1 MW ICRF, no faults. Both MGI gas jets fired successfully. Timing
was such that F jet hit the plasma about 1.5-1.6 ms before B jet.
016 Plasma. 1 MW ICRF, with one short fault. Both MGI gas jets fired
successfully. Timing was such that the F jet hit the plasma about 0.35-0.5
ms after the B jet. (We wanted it to hit 0.5 ms after.)
017 Plasma. 1 MW ICRF, no faults. Both MGI gas jets fired successfully. Timing
was such that the F jet pressure transducer started to rise about 0.9-1.0
ms later than the B jet pressure transducer. (Wanted 1.0 ms.)
018 Plasma. 1 MW ICRF, with some faults between 0.800 and 0.900 s. Wth steady
when gas jets fire. Both MGI jets fired successfully. Timing was such that
the F-jet hit the plasma about 1.4-1.5 ms after B-jet.
019 Plasma. 1 MW ICRF, no faults. Both MGI jets fired successfully. Timing was
such that the F-jet hit the plasma about 2.0 ms after the B-jet did.
020 Plasma. 1 MW ICRF, no faults. Both MGI jets fired successfully. This was
a repeat of shot 016 (F-jet hits plasma ~0.5 ms after B-jet).
021 Plasma. 1 MW ICRF, no faults. Both MGI jets fired successfully. This was
a repeat of shot 013 (F-jet hits plasma ~0.5 ms before B-jet).
022 Plasma. 1 MW ICRF, with some faulting between 0.800 and 0.900 s. Wth steady
when gas jets hit. Both gas jets fired successfully. Aimed to have F-jet
hit plasma ~1.25 ms after B-jet.
023 Plasma. 1 MW ICRF, with no faults. Both MGI gas jets fired successfully.
Aimed to have F-jet hit plasma ~1.25 ms before B-jet.
|
| Entered: Feb 2 2012 09:23:28:500PM |
| Author: Robert Granetz |
Session leader summary for Thursday 2012/02/02: MP #675 -- Initial disruption mitigation experiments with two gas jets Session leaders: G. Olynyk & R. Granetz Physics operator: J. Irby This run's primary goal is to look at the toroidal asymmetry of the gas-jet-induced radiated power using two gas jets as a function of the relative timing of the gas jet firings. We got the hardware operational during yesterday's maintenance day. During a couple of no-plasma test shots this morning, we confirmed that the B and F gate valves properly open automatically when we go into PULSE state, but we also determined that the PLC interlock hardware and/or logic is not working properly. So after shot 2, I bypassed the interlock box, and from then on the gas jet system worked flawlessly. We spent an hour or two firing a single gas jet per shot to determine the proper durations to get roughly equal amounts of gas into the torus, and to determine that the F gas jet fires about 1.1 ms later than the B gas jet for the same start setting. Using this information, we then fired both gas jets on each shot, starting with shot 10. We raised the toroidal field to 5.6 T on shot 11 in order to optimize the plasma coverage of FRC ECE, and ran identical plasmas for the rest of the day. We spend most of the run doing a scan of relative starting times for the two gas jets by varying F_START from about 1.5 ms before the optimal ""simultaneous"" setting, to +2.1 ms after. Analysis of the AXA and AXJ arrays, and the DMBOLO signals will be done shortly to determine the toroidal asymmetry for each of today's shots. See Geoff's SL summary for additional information. |
| Entered: Feb 3 2012 12:31:38:370AM |
| Author: Robert Granetz |
Table of relative timing delay and corresponding shots
------------------------------------------------------
Note: B_START = 1.0000s and F_START = 0.9989 s corresponds to
a "relative" delay of 0.0 ms, i.e. this gives a pretty good
simultaneous start on the pressure transducer signals.
Relative delay Shots
-------------- -----
-1.5 ms (F before B) 15
-1.25 23
-1.0 14
-0.5 13, 21
0.0 10, 11, 12
+0.5 16, 20
+1.1 17
+1.25 22
+1.6 18
+2.1 19
B only (optimal duration) 09
F only (optimal duration) 06
B only (other durations) 04, 08
F only (other durations) 05
no gas jets 03
|
| Entered: Feb 3 2012 12:52:25:543AM |
| Author: Robert Granetz |
I wrote a routine to plot the ratio AXA[19]/AXJ[10] (these two chords have the same tangency radii, and look near the center). If you look at the ratio during the pre-TQ, there's an incredibly consistent dependence on the relative timing of the two jets, in the direction that one would expect. At the extremes of the range of relative timings, the pre-TQ ratios match the corresponding single-jet results...absolutely phenominal result. I need to decide how to distill the ratio vs time during the pre-TQ into a single number for each shot, so I can make a simple plot vs relative timing. It's good news for ITER. |
| Physics Operator Summaries |
| Session Leader Comments | |||
| Feb 2 2012 09:28:20:343PM | Robert Granetz | I hooked up the F pressure transducer signal to channel 2 of the ORNL amplifier box. (At least, I'm hoping it's a 2nd channel.) | |
| Feb 2 2012 09:28:44:947PM | Robert Granetz | I filled both B and F plena to 55 bar with a mixture of 85% He / 15% Ar | |
| Feb 3 2012 12:28:29:220AM | Robert Granetz |
Table of relative timing delay and corresponding shots
------------------------------------------------------
Note: B_START = 1.0000s and F_START = 0.9989 s corresponds to
a "relative" delay of 0.0 ms, i.e. this gives a pretty good
simultaneous start on the pressure transducer signals.
Relative delay Shots
-------------- -----
-1.5 ms (F before B) 15
-1.25 23
-1.0 14
-0.5 13, 21
0.0 10, 11, 12
+0.5 16, 20
+1.1 17
+1.25 22
+1.6 18
+2.1 19
B only (optimal duration) 09
F only (optimal duration) 06
B only (other durations) 04, 08
F only (other durations) 05
no gas jets 03
| |
| Feb 3 2012 12:53:43:990AM | Robert Granetz | I wrote a routine to plot the ratio AXA[19]/AXJ[10] (these two chords have the same tangency radii, and look near the center). If you look at the ratio during the pre-TQ, there's an incredibly consistent dependence on the relative timing of the two jets, in the direction that one would expect. At the extremes of the range of relative timings, the pre-TQ ratios match the corresponding single-jet results...absolutely phenominal result. I need to decide how to distill the ratio vs time during the pre-TQ into a single number for each shot, so I can make a simple plot vs relative timing. It's good news for ITER. | |
| Feb 7 2012 02:14:45:327PM | Geoff Olynyk | I have defined and retrieved several key times for the disruptions in today's
run. NOTE! Shot 007 (the fizzle) is not included in this list. Only the 19 plasmas that have gas jets are included. Also note that there is no entry for the F-jet pressure rise on shot 005, or the B-jet pressure rise on shot 008, because these MGI shots had very small amounts of gas making it through the valve; not enough to cause a significant pressure rise on the transducer and get the timing. So these ones are in there as NaN. Definitions: 1. BTrig - Start of rise on TTL waveform to B-jet [s] 2. FTrig - Start of rise on TTL waveform to F-jet [s] 3. BDur - Duration of TTL pulse to B-jet [ms] 4. FDur - Duration of TTL pulse to F-jet [ms] 5. BPres - Start of rise of pressure transducer waveform for B-jet [s] 6. FPres - Start of rise of pressure transducer waveform for F-jet [s] 7. tStag = (FPres - BPres)*1.e3 - This is the stagger time between the two gas jets, as defined by their pressure waveforms. Plot vs. this when plotting things like integrated radiation asymmetry. [ms] 8. gEdge - Time when DMBolo average signal rises from 0, indicating presence of significant impurities in plasma. [s] 9. TQ_dm - Time when DMBolo average emissivity signal starts to sharply rise, indicating that the thermal quench event has started. [s] 10. TQ_end - Time at which the DMBolo average emissivity signal reaches a local minimum before rising again during the CQ. This is typically ~0.2-0.4 ms before the peak in the plasma current waveform. [s] 11. TQ_SXR - Time at which the core SXR (XTomo array 3 chord 19) has fallen to half its peak value. [s] 12. CQ - Peak in plasma current as measured by Rogowski coil (the 10 kHz signal stored in the HYBRID tree) [s] OK, here comes the table, as comma-separated values: "SHOT","BTrig","FTrig","BDur","FDur","BPres","FPres","tStag","gEdge","TQ_dm","TQ_end","TQ_SXR","CQ" 1120202004,1.00000,"NaN",1.90,"NaN",1.00162,"NaN","NaN",1.00299,1.00406,1.00469,1.00452,1.00490 1120202005,"NaN",1.00000,"NaN",1.90,"NaN","NaN","NaN",1.00471,1.00683,1.00735,1.00729,1.00763 1120202006,"NaN",1.00000,"NaN",3.00,"NaN",1.00284,"NaN",1.00399,1.00536,1.00592,1.00582,1.00619 1120202008,1.00000,"NaN",1.10,"NaN","NaN","NaN","NaN",1.00317,1.00426,1.00485,1.00471,1.00508 1120202009,1.00000,"NaN",1.28,"NaN",1.00162,"NaN","NaN",1.00300,1.00411,1.00467,1.00462,1.00490 1120202010,1.00000,0.99890,1.28,3.00,1.00159,1.00144,-0.15,1.00283,1.00401,1.00438,1.00446,1.00470 1120202011,1.00000,0.99890,1.28,3.00,1.00164,1.00130,-0.34,1.00240,1.00398,1.00436,1.00442,1.00470 1120202012,1.00000,0.99890,1.28,3.00,1.00160,1.00156,-0.04,1.00252,1.00399,1.00439,1.00442,1.00469 1120202013,1.00000,0.99840,1.28,3.00,1.00163,1.00103,-0.60,1.00200,1.00365,1.00409,1.00410,1.00440 1120202014,1.00000,0.99790,1.28,3.00,1.00166,1.00050,-1.16,1.00140,1.00306,1.00367,1.00355,1.00394 1120202015,1.00000,0.99740,1.28,3.00,1.00166,0.99998,-1.68,1.00090,1.00265,1.00324,1.00308,1.00341 1120202016,1.00000,0.99940,1.28,3.00,1.00162,1.00195,0.33,1.00298,1.00406,1.00454,1.00450,1.00480 1120202017,1.00000,1.00000,1.28,3.00,1.00166,1.00252,0.86,1.00303,1.00415,1.00453,1.00461,1.00490 1120202018,1.00000,1.00050,1.28,3.00,1.00162,1.00299,1.37,1.00296,1.00416,1.00453,1.00464,1.00490 1120202019,1.00000,1.00100,1.28,3.00,1.00163,1.00347,1.84,1.00294,1.00416,1.00462,1.00469,1.00491 1120202020,1.00000,0.99940,1.28,3.00,1.00166,1.00192,0.26,1.00291,1.00407,1.00447,1.00452,1.00480 1120202021,1.00000,0.99840,1.28,3.00,1.00164,1.00081,-0.83,1.00180,1.00354,1.00400,1.00399,1.00430 1120202022,1.00000,1.00015,1.28,3.00,1.00164,1.00276,1.12,1.00290,1.00428,1.00476,1.00465,1.00501 1120202023,1.00000,0.99765,1.28,3.00,1.00162,1.00017,-1.45,1.00100,1.00282,1.00336,1.00327,1.00360 It can also be found in worksheet 'events' of the following spreadsheet: /home/golynyk/mpdata/mp675/gas_jet_timing.ods Or all of them can be loaded into memory in IDL by running the following two IDL scripts, in order (run scripts using .r program_name.pro) 1. /home/golynyk/mpdata/mp675/idl/mp675_load.pro (This takes a while to run because it's loading 19x6 = 114 DMBolo signals) 2. /home/golynyk/mpdata/mp675/idl/mp675_anal.pro | |
| Oct 1 2012 06:29:52:097PM | Geoff Olynyk | Here is a chart showing the stagger time scan from today. Note we assume a 0.790 ms relative delay (that is, if you fire them at the same time, the F-jet arrives at the plasma edge 0.79 ms after the B-jet).
shot nebar Wth t_stag Other notes -------------------------------------------------------------- 1120202006 1.55 52 F only Normal field, LSN, L-mode 1120202015 1.61 43 -1.81 Normal field, LSN, L-mode 1120202023 1.58 50 -1.56 Normal field, LSN, L-mode 1120202014 1.56 48 -1.31 Normal field, LSN, L-mode 1120202013 1.56 48 -0.81 Normal field, LSN, L-mode 1120202021 1.56 49 -0.81 Normal field, LSN, L-mode 1120202010 1.58 52 -0.31 Normal field, LSN, L-mode 1120202011 1.55 45 -0.31 Normal field, LSN, L-mode 1120202012 1.56 48 -0.31 Normal field, LSN, L-mode 1120202016 1.59 46 +0.19 Normal field, LSN, L-mode 1120202020 1.58 51 +0.19 Normal field, LSN, L-mode 1120202017 1.57 48 +0.79 Normal field, LSN, L-mode 1120202022 1.59 48 +0.94 Normal field, LSN, L-mode 1120202018 1.57 52 +1.29 Normal field, LSN, L-mode 1120202019 --- 50 +1.79 Normal field, LSN, L-mode 1120202009 1.56 47 B only Normal field, LSN, L-mode | |
| Feb 2 2012 08:52:55:720AM | 1120202001 | Geoff Olynyk | I'm told the alternator is delayed spinning up and the start of the run is delayed 1 hour. We are planning to use this time do no-plasma shots to test the TORVAC (and other) interlocking on the gas jet system.
Both gas jet plenums are loaded with 85% He, 15% Ar at 55 bar. Normal pressure for the MGI system is 70 bar but according to Oak Ridge, the new (F-port) gas valve apparently is having problems opening at that pressure. (No 100,000-mile powertrain warranty on these valves.) We are going to start at 55 bar and possibly increase to 60 bar later. |
| Feb 2 2012 09:18:26:587AM | 1120202001 | Geoff Olynyk | Shot 001 will be a test of the gate valves on the MGI system only. They are supposed to open at t = -3.0 s in the shot cycle. We will have both gate valves (B and F) open but will not be firing the gas jets on this one.
Result: Both gate valves successfully opened. Gas jets did not fire (as expected). Next shot: No plasma; full test of F-port gas jet. |
| Feb 2 2012 09:29:20:477PM | 1120202001 | Robert Granetz |
Shot 01 - No-plasma shot to test whether both gas jet gate valves open
automatically during the PULSE state. I'll check this by watching
the RSView status. I will NOT fire the fast valves for this test.
|
| Feb 2 2012 09:29:56:647PM | 1120202001 | Robert Granetz |
Shot 01 - Both gas jet gate valves opened automatically in PULSE state.
So far, so good.
Next shot: Try firing just the F gas jet to test that everything works with
all the interlocks involved, and also to see if the fast pressure
transducer signal works. The start of the fizzle detector will
be set at t=1.2 s so it doesn't confuse us.
|
| Feb 2 2012 10:12:09:667AM | 1120202002 | Geoff Olynyk | Shot 002
----------------------------- Plan: This will be a no-plasma test of the F-port (new) gas jet. Two things are being tested here: (1) The TORVAC interlock on the gas jet chassis, and (2) Whether the pressure transducer for F-port valve is being amplified. (Granetz hooked up the F-port gas valve pressure transducer to what we think is another amplifier channel on our lone Oak Ridge pressure transducer amplifier, but we're not sure whether it will actually work.) If the gas jet does not fire because of some problem with getting a permissive from the gas jet interlock, we will disable the interlock on the gas jet system. This has been the case in past years. Moving the fizzle detector start time to 1.2 s so that the gas jet system gets a permissive from the fizzle detector despite not having any plasma on this shot. ~30 minute delay while EngOps and IT support troubleshoot a problem with changing the fizzle detector start time. Result: F-port gas jet did not fire. Triggering worked (TTL drive from trigger to interlock box shows on scope) but no voltage on output from gas jet chassis (power supply). So this means that either the interlock box never went permissive, or the power supply failed. The power supply was working last night, so we assume that it was the interlocking that failed. Took a cell access and bypassed the interlocking on the gas jet. Also having Maria Silveira make two more BNC-to-2pinLEMO cables so that we can digitize the output of the interlock box, and in future we can know whether problems are with the interlocking or the gas jet chassis (power supply). Next shot: Attempt plasma with RF heating; no gas jet. Use this shot to check out the plasma and RF after a maintenance day (no plasma since Tuesday 2012-01-31) and for background for our diagnostics. Fizzle detector turn-on has been restored to 0.080 s since MGI system is now bypassing the interlock anyway. |
| Feb 2 2012 09:30:31:553PM | 1120202002 | Robert Granetz |
Shot 02 - Gas jet didn't fire. So we're going to have to have a cell access in
order to bypass the interlock box.
|
| Feb 2 2012 10:24:23:430AM | 1120202003 | Geoff Olynyk | Shot 003
----------------------------- Plan: Attempt plasma with RF heating from t=0.800 s. Do not fire gas jets. Result: RF on at t=0.800 s as requested. 1 MW from E antenna. Lots of faults. Density request was erroneously low (nl04 = 0.6e20); will up for next shot. Went into H-mode at about 0.98 s (we think this is because of the low density), came out again when RF turns off at t=1.1 s. Disruption early in rampdown at about 1.6465 s. Next shot: Up density to nl04=1.0e20 m-3. Same RF heating. Fire B-port gas jet at t=1.000 s for duration of 1.9 ms. |
| Feb 2 2012 09:31:43:020PM | 1120202003 | Robert Granetz |
Shot 03 - This will be the first plasma shot, and NO gas jets. Note that the
gas jet signals are bypassing the interlock box.
|
| Feb 2 2012 09:58:43:220PM | 1120202003 | Robert Granetz |
Shot 03 - Plasma, pretty good, but disrupted in rampdown. 1 MW RF with faults.
We got an ELMfree H-mode starting at t=1.0 s, perhaps because the
density was too low.
Next shot: fire B gas jet at 1.0 s for 1.9 ms
|
| Feb 2 2012 10:36:35:270AM | 1120202004 | Geoff Olynyk | Shot 004
----------------------------- Plan: Plasma with RF, fire B-port gas jet only at t=1.000 s. Result: RF worked perfectly; plasma stayed in L-mode. B-port gas jet fired as expected. Next shot: Plasma with RF, fire F-port gas jet only at t=1.000 s. |
| Feb 2 2012 09:32:10:510PM | 1120202004 | Robert Granetz |
Shot 04 - Plasma. Disrupted at t=1.005 s due to B gas jet at t=1.000 s.
delta_P = 9 bar
1.0 MA, 5.4 T, 1.0e20 m-2, LSN, Prf=1 MW, L-mode.
Next shot: Fire F gas jet (only) at t=1.0 s for 1.9 ms.
|
| Feb 2 2012 11:10:04:167AM | 1120202005 | Geoff Olynyk | Shot 005
----------------------------- Plan: Plasma with RF, fire F-port gas jet only at t=1.000 s. Result: Plasma with RF. F-port gas jet fired at t=1.000 s but not, er, massively enough. Got a disruption but it wasn't mitigated very well - triggered a downward VDE. F-port gas jet pressure transducer is not being amplified. (Whatever it was that we plugged the BNCs into on that ORNL pressure transducer amplifier, it wasn't a second amplifier channel!) Next shot: Same thing, fire F-port MGI jet again. Up the duration of the F-port MGI jet to 3.0 ms (from current 1.9 ms). |
| Feb 2 2012 09:33:22:437PM | 1120202005 | Robert Granetz |
Shot 05 - Plasma, disrupted at t=1.007 s due to F gas jet at t=1.0 s for 1.9 ms,
but there wasn't very much gas injected.
Next shot:
|
| Feb 2 2012 09:56:39:397PM | 1120202005 | Robert Granetz | For next shot increase F gas jet duration to 3 ms. Fire F gas jet only. Refill plenum prior to next shot. |
| Feb 2 2012 11:38:14:440AM | 1120202006 | Geoff Olynyk | Shot 006
----------------------------- Plan: Same plasma as before. Fire F-port gas jet only at t=1.000 s, but with increased duration (3.0 ms instead of 1.9 ms). Result: Plasma with no RF faults. Much more successful. Got more gas in this time. Next shot: Same plasma. Fire B-port gas jet only at t = 1.000 s, with duration shortened to 1.4 ms. |
| Feb 2 2012 09:33:52:017PM | 1120202006 | Robert Granetz |
Shot 06 - Plasma, disrupted at 1.006 s due to F gas jet. We got much more
gas with this 3 ms pulse, and the F fast pressure transducer is
is working nicely. The z-centroid went down more than shot 4 (B gas
jet), but not as far as shot 5 (F gas jet). Pressure drop in
F plenum is too noisy to get a useful measurement.
|
| Feb 2 2012 11:50:31:763AM | 1120202007 | Geoff Olynyk | Shot 007
----------------------------- Plan: Same plasma as before. Fire B-port gas jet only at t=1.000 s, but with decreased duration from shot 004 (1.4 ms instead of 1.9 ms). Result: Fizzle. B-port gas jet still fired. Still got more gas than F-port gas jet had put in on shot 6. Next shot: Same plasma. Fire B-port gas jet only at t = 1.000 s. Reduce duration of gas jet to 1.1 ms from 1.4 ms. |
| Feb 2 2012 09:34:56:597PM | 1120202007 | Robert Granetz |
Shot 07 - Fire B gas jet, but with a duration of 1.4 ms to see if we can
match the lower amount of gas that the F gas jet injects.
Both plena have been refilled to 55 bar before the shot.
|
| Feb 2 2012 09:57:32:590PM | 1120202007 | Robert Granetz |
Shot 07 - Fizzle. B gas jet fired for 1.4 ms, and torus pressure was
still much more than the F gas jet for 3 ms
Next shot: decrease B pulse duration to 1.1 ms; replenish B plenum before shot
|
| Feb 2 2012 12:17:14:703PM | 1120202008 | Geoff Olynyk | Shot 008
----------------------------- Plan: Same plasma as before. Fire B-port gas jet only, at t = 1.000 s, but with decreased duration from shot 007 (1.1 ms instead of 1.4 ms). Result: Plasma with RF, no faults. B port jet fired as expected. Not much gas made it through (torus pressure change only ~ 40 mtorr). Next shot: Same plasma, B jet only. Increase duration to 1.28 ms. Want to get torus pressure change of about 150 mtorr from B jet, in order to match F jet with pulse duration 3.0 ms. Cell access before shot 009 in order for diagnosticians who are not me or Granetz to tweak things. |
| Feb 2 2012 09:38:17:900PM | 1120202008 | Robert Granetz |
Shot 08 - Plasma, disrupted at t=1.005 s due to B gas jet, which fired at
t=1.0 s for 1.1 ms. Much, much less gas was injected on this shot.
So we've bracketed the B durations to between 1.1 and 1.4 ms in order
to match 3 ms on the F gas jet.
Next shot: fire B gas jet only, for a duration of 1.28 ms. Refill plena
before shot.
|
| Feb 2 2012 12:32:10:850PM | 1120202009 | Geoff Olynyk | Shot 009
----------------------------- Plan: Same plasma as before. Fire B-port gas jet only, at t = 1.000 s, but with increased duration from shot 008 (1.28 ms instead of 1.1 ms). Attempting to get torus pressure change of about 150 mtorr from B jet in order to match F jet with 3.0 ms duration. Result: Plasma, RF heating with no faults. B jet fired as expected. Next shot: Fire both jets. Set duration on B jet to 1.28 ms, and on F jet to 3.0 ms. Fire F jet 1.1 ms earlier than B jet in an attempt to get them to hit at the same time. |
| Feb 2 2012 09:38:51:030PM | 1120202009 | Robert Granetz |
Shot 09 - Plasma, disrupted at t=1.005 ms due to B gas jet with a duration
of 1.28 ms. delta_P is about 5 bar in plenum.
|
| Feb 2 2012 12:55:21:680PM | 1120202010 | Geoff Olynyk | Shot 010
----------------------------- Plan: Same plasma as before. Fire both gas jets. Duration: B jet 1.28 ms F jet 3.00 ms Trigger time: B jet 1.0000 s F jet 0.9989 s (= 1.0000 s - 1.1 ms) Result: Plasma and RF good. Both gas jets fired, pressure transducer signals show them leaving the valves at the same time! (To within 0.1 ms anyway.) Next shot: Repeat, identical |
| Feb 2 2012 09:39:19:803PM | 1120202010 | Robert Granetz |
Shot 10 - Fire both gas jets:
B start = 1.0000 s
B duration = 1.28 ms
F start = 0.9989 s (1.1 ms before B)
F duration = 3.00 ms
Refill both plena prior to shot
|
| Feb 2 2012 09:39:50:600PM | 1120202010 | Robert Granetz |
Shot 10 - Plasma, disrupted at t=1.0045 s; both gas jets fired, with timings
specified in my previous logbook entry. The fast pressure transducers
show that we did a good job of matching the relative amounts and
timings.
Next shot: repeat, no changes; refill plena prior to shot
|
| Feb 2 2012 01:24:48:690PM | 1120202011 | Geoff Olynyk | Shot 011
----------------------------- Plan: Same plasma current, density, and heating as shot 010. Fire both gas jets as in shot 010. FRCECE right now is seeing out to r/a of about 0.9 only. Since we want to use that diagnostic to look at the inward movement of the pre-TQ cooling front, we need to up the toroidal field slightly in order to bring the resonance layers out in radial location. So upping toroidal field to 5.6 T for this shot, and all subsequent shots today. Gas jet trigger time: B jet 1.0000 s F jet 0.9989 s (= 1.0000 s - 1.1 ms) Gas jet duration: B jet 1.28 ms F jet 3.00 ms Result: Plasma, with one RF trip at about 0.86 s. Came back on quickly. Wth was steady at time of disruption. Both gas jets fired successfully. Next shot: |
| Feb 2 2012 09:40:32:013PM | 1120202011 | Robert Granetz |
Shot 11 - At Amanda's suggestion, we'll raise Btor to 5.6 T for the rest
of the run. This is to enable the FRC ECE to give profiles all
the way to the plasma edge. This is important because Amanda will
be keeping the GPC gate valve closed for the rest of the day, and
also because the FRC ECE has good time resolution.
|
| Feb 2 2012 09:41:03:660PM | 1120202011 | Robert Granetz |
Shot 11 - Plasma, disrupted at t=1.0045 s. Both gas jets fired with the
same timings as the previous shot. The B-field was supposed to
be increased to 5.6 T, but Jim forgot to load into the tree.
Next shot: repeat with Btor=5.6 T
|
| Feb 2 2012 09:41:33:747PM | 1120202011 | Robert Granetz |
Shot 11 - Actually, Jim did load the Btor change. This shot has Btor=5.6 T,
as desired.
|
| Feb 2 2012 01:28:27:400PM | 1120202012 | Geoff Olynyk | Shot 012
----------------------------- Plan: Same plasma current, density, field, and heating as shot 011. Fire both gas jets as in shot 011. Toroidal field at 5.6 T. Gas jet trigger time: B jet 1.0000 s F jet 0.9989 s (= 1.0000 s - 1.1 ms) Gas jet duration: B jet 1.28 ms F jet 3.00 ms Result: Plasma. RF 1 MW; no faults. Both gas jets fired successfully. Next shot: Same plasma and heating. Same gas jet duration. Start scan of gas jet staggering time: move F-port jet 0.5 ms earlier. |
| Feb 2 2012 09:42:03:513PM | 1120202012 | Robert Granetz |
Shot 12 - Plasma, disrupted at t=1.0045 s; both gas jets fired with same
timings as previous few shots. Btor=5.6 T. Plena pressures
are dropping by about 5-6 bar on all of these shots.
Next shot: move start time of F gas jet by -0.5 ms, i.e. 0.5 ms earlier
than shot 12. (F_START = 0.9984 s)
|
| Feb 2 2012 01:48:32:450PM | 1120202013 | Geoff Olynyk | Shot 013
----------------------------- Plan: Same plasma and heating as shot 012. Fire both gas jets, with F-jet firing 0.5 ms earlier than the "hits plasma at the same time" time. Gas jet trigger time: B jet 1.0000 s F jet 0.9984 s (= 1.0000 s - 1.1 ms - 0.5 ms) Gas jet duration: B jet 1.28 ms F jet 3.00 ms Result: Success. Plasma, RF, gas jets worked as expected. Next shot: Move F jet 0.5 ms earlier than on this shot. |
| Feb 2 2012 09:42:36:323PM | 1120202013 | Robert Granetz |
Shot 13 - Both gas jets are firing with the following timings:
B_START = 1.0000 s
B_DURATION = 0.00128 s
F_START = 0.9984 s
F_DURATION = 0.0030 s
Both plena were refilled prior to the shot
|
| Feb 2 2012 09:43:08:900PM | 1120202013 | Robert Granetz |
Shot 13 - Plasma, disrupted at t=1.004 s; two gas jets with timing as specified
in my preceding logbook entry.
Next shot: move F gas jet another 0.5 ms earlier, i.e. F_START = 0.9979 s
|
| Feb 2 2012 02:05:35:130PM | 1120202014 | Geoff Olynyk | Shot 014
----------------------------- Plan: Same plasma and heating as shot 013. Fire both gas jets, with F-jet firing 1.0 ms earlier than the "hits plasma at the same time" time. Gas jet trigger time: B jet 1.0000 s F jet 0.9979 s (= 1.0000 s - 1.1 ms - 1.0 ms) Gas jet duration: B jet 1.28 ms F jet 3.00 ms Result: Plasma. RF, no faults. Gas jets fired as expected. Next shot: Advance F-port gas jet (earlier) by another 0.5 ms. |
| Feb 2 2012 09:43:48:980PM | 1120202014 | Robert Granetz |
Shot 14 - Gas jet timings:
B_START = 1.0000 s
B_DURATION = 0.00128 s
F_START = 0.9979 s
F_DURATION = 0.0030 s
Both plena were refilled to 55 bar prior to the shot.
Next shot:
|
| Feb 2 2012 09:44:15:153PM | 1120202014 | Robert Granetz |
Shot 14 - Plasma, disrupted at t=1.004 s; two gas jets with timings specified in
my preceding logbook entry
Next shot: move F gas jet another 0.5 ms earlier, i.e. F_START = 0.9974 s
|
| Feb 2 2012 02:29:51:997PM | 1120202015 | Geoff Olynyk | Shot 015
----------------------------- Plan: Same plasma and heating as shot 014. Fire both gas jets, with F-jet firing 1.5 ms earlier than the "hits plasma at the same time" time. Gas jet trigger time: B jet 1.0000 s F jet 0.9974 s (= 1.0000 s - 1.1 ms - 1.5 ms) Gas jet duration: B jet 1.28 ms F jet 3.00 ms Result: Plasma. RF, 1 MW, no faults. Both jets fired successfully. F jet pressure rise started about 1.6 ms before B jet pressure rise (not 1.5 ms as desired). Next shot: Same plasma and heating. Fire both jets, this time with the F jet set to arrive at the plasma 0.5 ms AFTER the B jet. |
| Feb 2 2012 09:44:43:580PM | 1120202015 | Robert Granetz |
Shot 15 - Gas jet timings:
B_START = 1.0000 s
B_DURATION = 0.00128 s
F_START = 0.9974 s
F_DURATION = 0.0030 s
Both plena were refilled to 54 bar prior to this shot.
|
| Feb 2 2012 09:45:53:990PM | 1120202015 | Robert Granetz |
Shot 15 - Plasma, disrupted at t=1.003 s; two gas jets with timing as specified
in previous logbook entry
Next shot: move F gas jet start by +2.0 ms (F_START = 0.9994 s), i.e. 0.5 ms
later than the optimal value to match the B gas jet.
|
| Feb 2 2012 02:59:55:667PM | 1120202016 | Geoff Olynyk | Shot 016
----------------------------- Plan: Same plasma and heating as shot 015. Fire both gas jets, with F-jet firing 0.5 ms later than the "hits plasma at the same time" time. Gas jet trigger time: B jet 1.0000 s F jet 0.9994 s (= 1.0000 s - 1.1 ms + 0.5 ms) Gas jet duration: B jet 1.28 ms F jet 3.00 ms Result: Plasma. RF tripped briefly once again. Both gas jets fired correctly. Note that the F jet pressure transducer started rising about 0.35-0.40 ms after B jet pressure transducer, not 0.50 ms as desired. Looking back, we may have had our original timing off by ~0.10 ms. From now on, adjust relative timing to 1.0 ms advance on F (instead of 1.1 ms). Next shot: Make F-jet 0.6 ms later than this shot. |
| Feb 2 2012 09:45:19:160PM | 1120202016 | Robert Granetz |
Shot 16 - Gas jet timings:
B_START = 1.0000 s
B_DURATION = 0.00128 s
F_START = 0.9994 s
F_DURATION = 0.0030 s
Both plena were filled to 54 bar prior to this shot.
|
| Feb 2 2012 09:46:34:993PM | 1120202016 | Robert Granetz |
Shot 16 - Plasma, disrupted at t=1.0045 s; two gas jets with timing as specified
in preceding logbook entry
Next shot: move F gas jet start time by +0.6 ms, i.e. F_START = 1.0000 s
|
| Feb 2 2012 03:11:15:110PM | 1120202017 | Geoff Olynyk | Shot 017
----------------------------- Plan: Same plasma and heating as shot 016. Fire both gas jets, with F-jet firing 1.0 ms later than the "hits plasma at the same time" time. Note that the "hits plasma at the same time" time has been adjusted to mean "F jet earlier than B jet by 1.0 ms". This may be confusing. Later when analyzing data, we will get the actual trigger times and pressure transducer start-of-rise (break-in-slope) times. Gas jet trigger time: B jet 1.0000 s F jet 1.0000 s (= 1.0000 s - 1.0 ms + 1.0 ms) Gas jet duration: B jet 1.28 ms F jet 3.00 ms Result: Plasma. 1 MW ICRF, no faults. Both gas jets fired successfully. TQ occurs at the same time as in shot 016, indicating that the B-jet (the one that is injected first) is what is triggering the TQ. This is not surprising. Next shot: Same plasma and heating. Fire both gas jets. Delay F-port jet by 0.5 ms relative to this shot. |
| Feb 2 2012 09:47:21:380PM | 1120202017 | Robert Granetz |
Shot 17 - Gas jet timings:
B_START = 1.0000 s
B_DURATION = 0.00128 s
F_START = 1.0000 s
F_DURATION = 0.0030 s
Both plena were refilled prior to this shot.
|
| Feb 2 2012 09:47:45:197PM | 1120202017 | Robert Granetz |
Shot 17 - Plasma, disrupted at t=1.0045 s; two gas jets with timing specified in
my previous logbook entry.
Next shot: move F gas jet start time by another +0.5 ms (F_START = 1.0005 s)
|
| Feb 2 2012 03:32:34:853PM | 1120202018 | Geoff Olynyk | Shot 018
----------------------------- Plan: Same plasma and heating as shot 017. Fire both gas jets, with F-jet firing 1.5 ms later than the "hits plasma at the same time" time. Gas jet trigger time: B jet 1.0000 s F jet 1.0005 s (= 1.0000 s - 1.0 ms + 1.5 ms) Gas jet duration: B jet 1.28 ms F jet 3.00 ms Result: Plasma. 1 MW RF with a few faults between 0.8 and 0.9 s. Wth seems to be steady, though. Next shot: Same plasma and heating. Fire both gas jets. Delay F-jet by another 0.5 ms. |
| Feb 2 2012 09:48:12:257PM | 1120202018 | Robert Granetz |
Shot 18 - Gas jet timings:
B_START = 1.0000 s
B_DURATION = 0.00128 s
F_START = 1.0005 s
F_DURATION = 0.0030 s
Both plena were refilled prior to this shot.
|
| Feb 2 2012 09:49:08:897PM | 1120202018 | Robert Granetz |
Shot 18 - Plasma, disrupted at t=1.0045 s; both gas jets fired; timing as
specified in previous logbook entry for this shot
Next shot: move F gas jet start time by another +0.5 ms (F_START = 1.0010 s)
|
| Feb 2 2012 04:03:47:787PM | 1120202019 | Geoff Olynyk | Shot 019
----------------------------- Plan: Same plasma and heating as shot 018. Fire both gas jets, with F-jet firing 2.0 ms later than the "hits plasma at the same time" time. Gas jet trigger time: B jet 1.0000 s F jet 1.0010 s (= 1.0000 s - 1.0 ms + 2.0 ms) Gas jet duration: B jet 1.28 ms F jet 3.00 ms Result: Plasma. RF, no faults. Both jets fired successfully with timing as expected. nl04 signal on bigboard (display at front of control room) drops to zero at aobut t=0.1 s. Next shot: Repeat shot 016 exactly. |
| Feb 2 2012 09:49:36:103PM | 1120202019 | Robert Granetz |
Shot 19 - gas jet timings:
B_START = 1.0000 s
B_DURATION = 0.00128 s
F_START = 1.0010 s
F_DURATION = 0.0030 s
Both plena were refilled prior to this shot.
|
| Feb 2 2012 09:50:01:733PM | 1120202019 | Robert Granetz |
Shot 19 - Plasma, disrupted at t=1.0045 s; both gas jets fired
See previous entry for timings for this shot
Next shot: start scan back in opposite direction; F_START = 0.9994 s
|
| Feb 2 2012 04:13:05:327PM | 1120202020 | Geoff Olynyk | Shot 020
----------------------------- Plan: Repeat of shot 016. Same plasma and heating as shot 016. Same gas jet setup as shot 016. (That is, fire both gas jets, with F-jet firing approximately 0.4 ms later than the "hits plasma at the same time" time.) Gas jet trigger time: B jet 1.0000 s F jet 0.9994 s (= 1.0000 s - 1.0 ms + 0.4 ms) Gas jet duration: B jet 1.28 ms F jet 3.00 ms Result: Plasma. RF. B-jet. F-jet. All were functioning as they are supposed to. Next shot: Repeat shot 013. |
| Feb 2 2012 09:50:34:330PM | 1120202020 | Robert Granetz |
Shot 20 - gas jet timings for this shot:
B_START = 1.0000 s
B_DURATION = 0.00128 s
F_START = 0.9994 s
F_DURATION = 0.0030 s
Both plena were refilled prior to this shot.
|
| Feb 2 2012 09:51:00:537PM | 1120202020 | Robert Granetz |
Shot 20 - Plasma disrupted at 1.0045 s; two gas jets; timings as per my other
logbook entry for this shot
Next shot: set F_START = 0.9984 s
|
| Feb 2 2012 04:16:56:263PM | 1120202021 | Geoff Olynyk | Just as a general note, today would be a great day for people looking to get statistics about the variability of their diagnostic in identical plasmas. |
| Feb 2 2012 04:30:57:607PM | 1120202021 | Geoff Olynyk | Shot 021
----------------------------- Plan: Repeat of shot 013. Same plasma and heating as shot 013. Same gas jet setup as shot 013. (That is, fire both gas jets, with F-jet firing approximately 0.6 ms earlier than the "hits plasma at the same time" time.) Gas jet trigger time: B jet 1.0000 s F jet 0.9984 s (= 1.0000 s - 1.0 ms - 0.6 ms) Gas jet duration: B jet 1.28 ms F jet 3.00 ms Result: Plasma. RF, 1.0 MW, no faults. Both gas jets worked as expected. Next shot: Fire F-jet 1.25 ms after B-jet. |
| Feb 2 2012 09:51:25:170PM | 1120202021 | Robert Granetz |
Shot 21 - gas jet timings for this shot:
B_START = 1.0000 s
B_DURATION = 0.00128 s
F_START = 0.9984 s
F_DURATION = 0.0030 s
Both plena were refilled to 54 bar prior to this shot .
|
| Feb 2 2012 10:00:29:433PM | 1120202021 | Robert Granetz |
Shot 21 - Plasma, disrupted at t=1.004 s; two gas jets; timings specified in
my other entry for this shot
Next shot: F_START = 1.00015 s
|
| Feb 2 2012 04:52:48:287PM | 1120202022 | Geoff Olynyk | Shot 022
----------------------------- Plan: Plasma and heating same as the last several shots. Fire both gas jets, with F-jet approximately 1.15 ms after B-jet. Gas jet trigger time: B jet 1.00000 s F jet 1.00015 s (= 1.0000 s - 1.0 ms + 1.15 ms) Gas jet duration: B jet 1.28 ms F jet 3.00 ms Result: Plasma. RF, 1 MW with some faults. Both gas jets fired successfully as requested. Next shot: Fire F-jet about 1.25-1.35 ms before B-jet. |
| Feb 2 2012 09:35:45:420PM | 1120202022 | Robert Granetz |
Shot 22 - Plasma, disrupted at t=1.0045 s; two gas jets
B_START = 1.0000 s
B_DURATION = 0.00128 s
F_START = 1.00015 (+1.25 ms from optimally simultaneous)
F_DURATION = 0.0030 s
Both plena were refilled to 54 bar prior to this shot.
Next shot: F_START = 0.99765
(This will be the last shot of today's run.)
|
| Feb 2 2012 05:12:24:383PM | 1120202023 | Geoff Olynyk | Shot 023
----------------------------- Plan: Plasma and heating same as the last several shots. Fire both gas jets, with F-jet approximately 1.35 ms before B-jet. Gas jet trigger time: B jet 1.00000 s F jet 0.99765 s (= 1.0000 s - 1.0 ms - 1.35 ms) Gas jet duration: B jet 1.28 ms F jet 3.00 ms This will be the last shot for today's run. Thank you to the staff for staying slightly late to accommodate this shot. Result: Plasma. 1 MW ICRF, no faults. Gas jet worked as requested. |
| Feb 2 2012 09:36:11:080PM | 1120202023 | Robert Granetz |
Shot 23 - Plasma, disrupted at t=1.0035 s; two gas jets
B_START = 1.0000 s
B_DURATION = 0.00128 s
F_START = 0.99765 s
F_DURATION = 0.0030 s
Both plena were refilled to 54 bar prior to this shot.
End of run
|
| Physics Operator Comments | |||
| Feb 2 2012 08:36:29:380AM | Jim Irby | One hour delay in run start for alternator | |
| Feb 2 2012 09:21:20:397AM | 1120202001 | Jim Irby | Loaded from 1120117015 --- seg 1 and seg 2 are on
prepuff 17 ms pg3 100% at -20 ms ef4 -1310 A RXL 0.005 m Argon enabled for first shot: 1 psi, 375 ms RXL from 0.005 m to -0.005 m loaded -- open tree done ********************************** 1 hour delay in alternator ********************************** Use time to continue testing of MGJs. ------------------------------------ no main gas on this shot --- give it a good hit on the next shots |
| Feb 2 2012 10:03:32:547AM | 1120202002 | Jim Irby | changes --------------------------------
pg3 from -56 to -1 ms at 100% fizzle start to 1.2 s turned off seg 2 to keep nl_04 feedback from adding even more gas open tree done results -------------------------------- looks like pg3 is working now |
| Feb 2 2012 10:17:34:587AM | 1120202003 | Jim Irby | changes --------------------------------
Try for plasma --- but no gas jet fizzle detector back to 0.080 s start seg2 back on pg3 back to -20 ms pulse loaded open tree done results -------------------------------- plasma --- I had the density programming too low -- raise to 1e20 for next shot |
| Feb 2 2012 10:36:12:487AM | 1120202004 | Jim Irby | changes --------------------------------
nl04 request from 6 to 10e19 /m^2 loaded results -------------------------------- Plasma into rampdown --- MGJ fired |
| Feb 2 2012 11:16:49:747AM | 1120202005 | Jim Irby | changes --------------------------------
no dpcs changes results -------------------------------- plasma ---- for last two shots: polarimeter follows disruption nicely on all chords -- 60 degree rotations |
| Feb 2 2012 11:26:17:383AM | 1120202006 | Jim Irby | changes --------------------------------
no dpcs changes results -------------------------------- plasma |
| Feb 2 2012 11:48:22:063AM | 1120202007 | Jim Irby | changes --------------------------------
no dpcs changes results -------------------------------- fizzle |
| Feb 2 2012 12:03:26:267PM | 1120202008 | Jim Irby | changes --------------------------------
no dpcs changes results -------------------------------- plasma |
| Feb 2 2012 12:26:35:100PM | 1120202009 | Jim Irby | changes --------------------------------
pg4 from 17 to 15 ms --- disruption recovery improvement? results -------------------------------- plasma |
| Feb 2 2012 12:43:00:073PM | 1120202010 | Jim Irby | changes --------------------------------
no dpcs changes results -------------------------------- plasma |
| Feb 2 2012 01:23:20:163PM | 1120202011 | Jim Irby | changes --------------------------------
Bt from 5.42 to 5.6 T results -------------------------------- plasma |
| Feb 2 2012 01:26:17:567PM | 1120202012 | Jim Irby | changes --------------------------------
seg 1 Bt changed to 5.6 T results -------------------------------- plasma |
| Feb 2 2012 01:45:16:673PM | 1120202013 | Jim Irby | changes --------------------------------
no dpcs changes results -------------------------------- plasma |
| Feb 2 2012 02:12:39:947PM | 1120202014 | Jim Irby | changes --------------------------------
no dpcs changes results -------------------------------- plasma |
| Feb 2 2012 02:26:16:040PM | 1120202015 | Jim Irby | changes --------------------------------
no dpcs changes results -------------------------------- plasma |
| Feb 2 2012 02:59:46:503PM | 1120202016 | Jim Irby | changes --------------------------------
no dpcs changes results -------------------------------- plasma |
| Feb 2 2012 03:52:29:343PM | 1120202017 | Jim Irby | changes --------------------------------
no dpcs changes results -------------------------------- plasma |
| Feb 2 2012 03:52:36:157PM | 1120202018 | Jim Irby | changes --------------------------------
no dpcs changes results -------------------------------- plasma |
| Feb 2 2012 03:52:42:707PM | 1120202019 | Jim Irby | changes --------------------------------
no dpcs changes results -------------------------------- plasma |
| Feb 2 2012 04:15:37:627PM | 1120202020 | Jim Irby | changes --------------------------------
no dpcs changes results -------------------------------- plasma |
| Feb 2 2012 04:29:42:673PM | 1120202021 | Jim Irby | changes --------------------------------
no dpcs changes results -------------------------------- plasma |
| Feb 2 2012 04:49:26:123PM | 1120202022 | Jim Irby | changes --------------------------------
no dpcs changes results -------------------------------- plasma |
| Feb 2 2012 05:04:28:510PM | 1120202023 | Jim Irby | changes --------------------------------
no dpcs changes results -------------------------------- plasma |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:13:58:630AM | Test | Ok | |
| 2 | 09:51:43:637AM | Test | Bad | Gas Jet didn't work |
| 3 | 10:11:40:963AM | Plasma | Ok | |
| 4 | 10:29:55:123AM | Plasma | Ok | |
| 5 | 10:57:47:227AM | Plasma | Ok | |
| 6 | 11:20:37:377AM | Plasma | Ok | |
| 7 | 11:42:21:140AM | Plasma | Ok | |
| 8 | 12:01:23:577PM | Plasma | Ok | |
| 9 | 12:22:28:777PM | Plasma | Ok | |
| 10 | 12:35:23:860PM | Plasma | Ok | |
| 11 | 12:58:40:407PM | Plasma | Ok | |
| 12 | 01:20:17:877PM | Plasma | Ok | |
| 13 | 01:40:51:667PM | Plasma | Ok | |
| 14 | 02:00:55:360PM | Plasma | Ok | |
| 15 | 02:24:03:567PM | Plasma | Ok | |
| 16 | 02:44:57:587PM | Plasma | Ok | |
| 17 | 03:05:06:207PM | Plasma | Ok | |
| 18 | 03:26:46:770PM | Plasma | Ok | |
| 19 | 03:46:43:330PM | Plasma | Ok | |
| 20 | 04:07:39:917PM | Plasma | Ok | |
| 21 | 04:26:48:473PM | Plasma | Ok | |
| 22 | 04:46:20:713PM | Plasma | Ok | |
| 23 | 05:05:34:887PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Feb 2 2012 09:13:38:790AM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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