| Miniproposals | ||||||||||||
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| Operators | |
| Session leader(s): | Seung Gyou Baek,Ian Faust,Seung Gyou Baek,Ian Faust |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Bill Cochran,Bill Byford |
| Engineering Operator Run Comment |
| MP#664 Spectral broadening of LH waves (SL: Baek) MP#710 Impurity transp |
| Session Leader Plans |
| Entered: Jul 9 2012 02:48:24:310PM |
| Author: Seung Gyou Baek |
| Run plan (MP 664 : Study of spectral broadening of LH waves) : 1/2 day (9AM-1PM)
To have a systematic data set, I will stick to the equilibrium that was used on 1120629xxx, but with different LH phasing (90 deg instead of 75 deg) to ensure that LH waves are accessible. B=5.4 T, Ip=550 kA, Tlh=0.6-1.4sec, N||= 90 deg 1. Power optimization (LSN) : 1120629013 , nl04 : 7e19 m^-2 (1) Plh = 300 kW (2) Plh = 600 kW (3) Plh = 800 kW Use maximum available LH power 2. LSN, (4) nl04 : 5.5e19 m^-2 3. USN, (example shot : 1101019014, try to match B-field and plasma current to those of LSN) (5) nl04 : 7e19 m^-2 (6) nl04 : 5.5e19 m^-2 4. Inner wall limited (example shot : 1120612015) (7) nl04 : 7e19 m^-2 5. Density ramp during LH from nl04: 5.5 ~ 7.5 e 19 m^-2 (8) LSN (9) USN If time permits, repeat step 2,3,4,and 5 with different LH phasing. |
| Entered: Jul 9 2012 04:00:05:253PM |
| Author: Ian Faust |
| MP710 Impurity transport in non-inductive plasmas (2nd half of day)
L. Delgado-Aparicio, N. Howard, I. Faust and M. Chilenski Goal: Observe and diagnose plasmas in which known non-recycling impurities (Calcium) are injected into a tokamak plasma with reduced ware-pinch (increased non-inductive current drive). Observe sawtooth-free impurity transport in the core. Discharge Plan: Due to the high density lower hybrid discharges in the 1/2st half of the day, the second half will inherently utilize the following characteristics: 1) LH launcher is conditioned for full power operation 2) The Alcator C-Mod wall is loaded with Deuterium due to higher density operation Step 1) achieve a locked mode (reference: 1120607004) (max x2 plasmas). Set integration time to HiReX to 20 ms. Inject CaF2 at .8 s (one pulse). Due to Seung-Gyou's run, helium environment for HiReX-Sr box will have been previously verified. Step 2) Run LH at maximum power ( >=800 kW coupled). (Reference topology 1101019014, using 75 phasing, this shot does not have MHD signature) for 1s starting at .7s. LBO injections at [.9 ,1.1, 1.3,1.5]. Extend flat-top to insure LH pulse is completely in flat top (t=1.7). Ip=500 kA, Bt = 5.4 T. Change HiRex Timing to 2ms. Goal of this plasma is to achieve nl_04 = 3-4e19 (ne_bar ~ 6e19), and will probably not be achieved at first attempt. Use cryo in USN in order to assist and control density, as wall loading could be an issue. When parameters requested are achieved, move to step 3. Allocate 2-3 shots for this purpose. (3-5 plasmas total at end of step 2). In the case of e-ITB correlated MHD, continue with the plan as laid out. The power reductions set in the next step should reduce MHD drive. Step 3) Reduce LH power at ~200-300kW coupled power increments while maintaining target plasma set in step 2. LH parameters (pulse length, phasing) stay the same, and same timing for HiReX and LBO. Achieve 2 plasmas per scenario for statistical purposes. This will require 4-6 plasmas (300,600 kW LH coupled power). Total shot use: 8-11 plasmas. Caveat: If the number of fizzles puts the shot use above 10, skip to step 4. Step 4) Achieve 'control' discharge. Remove LH power entirely. Use standard phasing on E antenna (transmitter 2, standard phasing) to get 800 kW ICRF during timing laid out for LHCD. Use standard LBO/ HiReX setup as in step 2 guideline. Requires x2 plasmas. Total shot use: 10-12 plasmas. At this point, necessary goals are achieved. In the case that more run time is available. Note: it is highly unlikely that it will get to this point Step 5) Remove ICRF. Rerun step 4). x1 plasma. Any other spare shots will be dictated by the course of the run. (Possibly an MSE calibration shot) Diagnostics: Mission Critical- Thomson Scattering, HiRex with Ca crystal. LBO with CaF2 slide. MSE and DNB. XTOMO, polarimeter and HXR. Z effective systems. TCI. XEUS and LowEUS. Secondary Diagnostics (still required) Magnetics, Reflectometery for fluctuations, CECE. AXUV diodes. ECE diagnostics. Tertiary Diagnostics: All passive diagnostics that do not require modifications to said run plan. Please consult I.Faust or L.Delgado-Aparicio with any questions. LH Launcher position with repect to the limiters: mm (1278) LH Start time: .7 sec LH Stop time: 1.7 sec Phasing: 75 deg (n|| -> deg phasing) 1.6->75, 1.9->90, 2.3->110, 2.7->135, 3.1->147 Net Power desired: 800 kW LH Run Duration: Half day (2nd half of a LH day) Waveform description: 1) Standard: Square pulse (might have 50 ms initial ramp up) 2) Special: 1 second operation |
| Physics Operators Plans |
| Entered: Jul 9 2012 03:18:20:140PM |
| Author: Steve Wolfe |
| Physop plan and engineering setup for Tuesday, July 10, 2012.
MP#664 Spectral broadening of LH waves (SL: Baek) MP#710 Impurity transport in non-inductive plasmas (SL: Faust) PO: wolfe ----------------- Engineering Setup ----------------- Run begins at 09:00 and ends at 17:00 (at least one C-Mod shot cycle should be run before 08:00 to check the data system per recommendation by jas) Power systems as on: 1120629013(Morning setup) 1101019014 (afternoon setup, note Invert times and Fizzle Gate extended) 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/LoWEUS 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 *for afternoon run LH(yes/no): YES (all day) Cryopump (yes/no): YES (all day) DNB (yes/no): not required 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 ============================================= Physop Plans ------------- MP#664 (morning) Spectal broadening of LH 1) Use seg1 from cryopump startup from last week. Start from LSN reference shot 1120629013 , seg2; raise nl04 to 7e19 Note that TF is ramping from 150 to 151kA, probably an error. Change to 150kA flat. Adjust gaps, etc. as directed for coupling. Take LH power scan per SL 2) Decrease nl04 back to 5.5e19 3) Import seg2 from 1101019014 (also to be used for afternoon run), Recalculate magnetics predictors from old shot Change Ip to match LSN cases above (Ip to 540kA), shorten flattop as on 1120629. Raise nl04 to 7e19. 3b) USN but reduce nl04 to 5.5e19 4) Go to inner wall limited 1120612015, seg2, nl04=7e19 (as run) 5) Density ramps from nl04=5.5 to 7e19 in LSN and USN cases If time permits, repeat cases with different LH phasing (not my department) -------------------------------------------------------- MP#710 (afternoon) Impurity transport in non-inductive plasmas 1) Start with Locked mode shot from seg4 of 1120607004. 2) Import seg#2 from USN reference shot#1101019014 and recalculate magnetics predictors (if not set up beforehand) note extended pulse length to EOF at 1.7 sec; Need to extend gains on ZCUR2, ZCUR3, RXU, ZXU, B21_Proj, EF2_by_EF4, nl04, EF4U (others already done). Check engineering setups, including Fizzle gate. Turn on oh1_crossover loadable (TEST_PROS) 3) Carry out LH power scan (downward) as per SL plan. Adjust gaps as indicated by LH physicist. 4) Take "control" shots with 800kW ICRF in place of LH. Highly unlikely to maintain this low a density with ICRF, but try. 5) Repeat with ohmic only. 6) MSE Calibration shot ???? |
| Session Leader Summaries |
| Entered: Jul 10 2012 06:12:13:280PM |
| Author: Ian Faust |
| "Quality isn't something that can be argued into an article or promised into it. It must be put there. If it isn't put there, the finest sales talk in the world won't act as a substitute." - C. G. Campbell
Today's half run of MP710 was incomplete at best. MP critical diagnostics, namely the Diagnostic Neutral Beam (DNB) were unavailable for necessary measurements for q profiles. This mission-critical piece of hardware means that the goals set forth in MP710 were unobtainable. Without a MP critical diagnostic, the data that would have been used for modelling was unavailable. That understood, time had to be used. Some time (~1 hr) was used to debug beam problems. TF issues slowed the run and had a dud early on. Breaches further slowed progress, and HiReX data losses plagued one of the shots that were taken. Several shots were taken for Seung-Gyou as deliberations were made. No contingency plan was made for this situation. This was the third attempt at the MP, which faced previous accidental vents and DNB losses on previous rundays. With the time given, a curtailed plan was hatched which tried to maximize LH power, and reduce the loop voltage as much as possible. As soon as this goal was achieved, the power was reduced toward zero. It was decided to continue as on plan beginning at 15:00 to scope out parameter space for this MP. This occurred after the locked mode was taken, and Seung-Gyou completed his necessary scans. The goal of zero-loop voltage was not achieved, with plaguing MHD and high z_eff plausibly at cause. Still, a scan in LH power was undertaken, which provided clean, well coupled power to extended pulses, in a way that was not done previously. Hopefully, this data will be very interesting for theses associated with the polarimeter. A stable, robust 500kA plasma with line averaged density of ~6e19 was reliably created in the likeness of 110119014. These were the first low density near zero-loop voltage plasmas of the current financial year. Steve Wolfe (P.O) did a wonderful job. Interesting results were seen on non-thermal ECE, as the injections broadly increased the non-thermal emission. My guess is that more collisional tail electrons (near bulk) become depleted slightly, leading to a subtle change in downshift frequencies as the tail re-equilibrates. Those electrons predominantly driving the current are not as effected. In moderate LH power discharges, the increased pulse length proved to be interesting in seeing the evolution of current drive. The 500kW discharge nearly removed the sawteeth .5s into the pulse. It lends credence to using LH in a greater than .5s pulses, this guarantees that the effects seen in current drive stabilize given the long L/R time. Finally, the number of injections were increased as the general confinement of a 500kA plasma was poor. This switched from the every .2 s injection to every .1 s. This allowed for the proper building of some statistics, with locked mode, without locked mode, with m=2 mode, without m=2 mode, with sawteeth, and in sawteeth-stabilized plasmas. It will be a travesty as the financial year moves forward. Events of this magnitude will only likely occur with more frequency, as the required diagnostic sets and plasma parameters are more intricate and specialized. This half run day (in my opinion) serves as an epitome of this. It is only through the due diligence, proper planning, and thorough execution that we can prevent runs such as this from occurring. |
| Entered: Jul 13 2012 05:25:59:467PM |
| Author: Seung Gyou Baek |
| MP 664 (9AM -1PM)
(1) LSN : density threshold : the shot #6 (high density) and #7 (low) (2) LSN density ramp : shot #8 (3) USN : density threshold : #10 (high density), #12 (low) (4) outer gap scan during USN : #9 (R.G.=1.2cm),10 (1.5cm),11 (1.8 cm),14 (2.1),20 (2.2) (5) change of loop voltage at nebar=1.3e20 m^-3 by 0.5 Volt : #15,21 (both R.G. = 2.3 cm) (1) (2) We observed the strong sidebands (70 MHz apart) comparable to the pump when the density was raised over 1.1e20 m^-3 during LSN. (3) But, when we changed the magnetic topology to USN, the sidebands became weaker, and their frequency spacing became ~35 MHz. It does not appear strong pump depletion occured, according to the measurements. (4) We noticed that the density in front of the LH grill is higher by 10 times compared to that of LSN case, so we thought this may cause PDIs at the outboard side, and attempted to lower the density by increasing the outer gap for plasmas with nebar=1.2e20 m^-3 (shot 9, 10,11,14,20 no cryopump). When we increased the outer gap, the PDI level decreased, and the edge non-thermal temperature increased. (5) We saw the change of loop voltage for plasmas with nebar=1.3e20 m^-3 by 0.5 V and edge nonthermal temperature to 0.8 V. LSN power scan @ nl04=7e19 m^-2 #3: 200 kW #4: 500 kW #6: 600 kW LSN @ lower density #7: nl04~6e19 m^-2 LSN density scan (0.9-1.2e20 m^-3) due to puffing for GPI #8 USN #9 :1.15e20 m^-3, Right Gap = 1.3 cm #10 : repeat with R.G.= 1.5 cm #11 : repeat with R.G.= 1.8 cm #12 : low density (0.9e20 m^-3) R.G. =1.5 cm inner wall limited #13: inner wall limited, nebar = 1.3-1.2e20 m^-3 Revisit to USN, high density #14: repeat #11 with R. G. = 2.1 cm #15: Turn off the cryo pump to decrease the density in front of the grill,repeat, MARFE, but nebar=1.3e20m^-3 for 1.2-1.4 sec #16, reudce the density, turn off the cryopump. slightly low compared to the shot #11,#14 Revisit to USN, high density #20 : reload #16, raise the density (R.G= 2.2cm), matched pairs to the shot #9,10,11,and #14, #21 : raise the density to examine the change of the loop voltage,MARFE, but nebar=1.3e20 m^-3 from 1.2-1.4sec |
| Physics Operator Summaries |
| Entered: Jul 10 2012 06:02:57:880PM |
| Author: Steve Wolfe |
Physop summary for Tuesday, July 10, 2012
SL: Baek MP#664 shots 2-16, 19-21
SL: Faust MP#710 shots 17-18, 22-29
PO: wolfe
EO: Cochran, Tesfaye, Byford
The machine ran pretty well today, although cooling was somewhat slow.
Seung Gyou completed essentially all
of his planned experiment. Ian was not able to do everything he wanted,
largely because the DNB failed just before his part of the run began.
There were also a couple of power supply problems that cost a couple of
shots.
In part 1, we ran through the LSN, USN, and limiter cases without much
difficulty. The higher density (7e19) USN cases had unexpectedly good
LH response. There were several gap changes to optimize the coupling in
this condition. Some of these, especially with large outer gaps, had
marfes which resulted in increased nebar. At Syunichi's suggestion, we
tried several of these shots with the cryopump off, which were expected
to require less neutral fueling and perhaps change the density at the
launcher. There did seem to be some effect, but it's not clear what the
difference was. Startup was pretty robust with or without the cryopump;
pg4 was dropped from ~42msec to 20msec in the non-cryopump cases (which
I forgot to retitle in segment 1). Despite the equilibrium changes, Brian
was able to get the ASP conditioned up for his run tomorrow. However, he
did lose some electrodes on the Inner wall probe when the plasma moved
inward due to a glitch at crossover on one shot where the crossover time
was delayed to 0.8sec.
The first attempt (#17) at the locked mode calibration shot for Ian's experiment
had a TF failure. Shot 18 was successful, and we got set up to run the
USN low density 500kA case, but the DNB had problems with the arc current,
which could not be repaired by between shot patches. Bob estimated a
minimum of an hour delay, with no guarantees of a successful repair.
There was a long delay while we decided how to proceed, and
took a couple of shots more to extend the MP#664 experiment at
the high density condition, pending further evaluation of the DNB
and consideration of alternate experiments. Shot#19 disrupted due to
an oh2l crowbar, and 20 and 21 were somewhat successful USN high density
cases.
Ultimately it was decided (despite the SL's reluctance) to pursue the
characterization of the impurity transport with LBO for MP#710,
even though the MSE constraint to analyze the results was not going to
be present. We were not able to actually get to zero loop voltage with
available LH power and machine conditions, but we got close, under 0.2V
sustained for almost 1sec on shot#23 and briefly down to 0.1V on #24.
The OH1_crossover routine seemed to
work reasonably well, although the LH was holding the current very near
zero in some of the better current drive shots; if it had been any closer
it would have been advisable to change the LH timing.
The low density cases later in the run had problems with locked modes
before the LH came on, which was "cured" by increasing the density, at
the cost of ending up with decreasing density ramps rather than flat
targets during the RF. There were no particular problems encountered
running the longer flattops, almost all of which ramped all the way down,
ending at about 2.1 to 2.3sec. I did find that extending the EF4
program at 2kA beyond 1.5sec resulted in flooring of EF2U and loss
of vertical control at the end of the pulse, leading to a disruption
at 2sec on #28. An attempt to lower the target from 500kA to 400kA to
try to reduce the loop voltage further (shot#27) led to a locked mode
disruption at 0.9sec (locked mode onset at ~0.7sec); I didn't expect
that, but it may be that the reverse dI/dt contributes to the locked mode.
It might have been better to use an early crowbar to prevent overshoot
on the current, but by the time we got to that it was too late to
start on that development task.
The ratiomatic is working again, although there was some problem on the first
shot (#2), and the calibration appears to be low by about a factor of 2 to 3.
Good startups had initial ratiomatic pressure around 0.022mTorr both with
and without cryopump.
Scorecard:
No power tests 1
Duds 1 (no TF)
Fizzles 2
Plasmas 25 (including 2 disruptions in flattop)
========= ==
Shots 29
|
| Session Leader Comments | |||
| Jul 10 2012 09:18:19:867AM | 1120710002 | Seung Gyou Baek | fizzle
next: repeat 1-(1) : nl04~7e19 m^-2,Plh=300 kW |
| Jul 10 2012 09:26:50:973AM | 1120710002 | Seung Gyou Baek | shot ran
next : 1-(2) Plh= 500 kW |
| Jul 10 2012 09:30:01:997AM | 1120710003 | Seung Gyou Baek | shot ran
next : 1-(2) Plh= 500 kW, increase the density slightly |
| Jul 10 2012 09:55:54:777AM | 1120710004 | Seung Gyou Baek | after the shot #4 , Agilent spectrum analyzer triggered at 1.35sec |
| Jul 10 2012 10:01:18:450AM | 1120710005 | Seung Gyou Baek | fizzle, no plasma |
| Jul 10 2012 10:27:02:980AM | 1120710006 | Seung Gyou Baek | shot ran
next: lower the density : nl04 = 5.5e19 m^-2 |
| Jul 10 2012 10:27:23:153AM | 1120710006 | Seung Gyou Baek | shot ran
next: lower the density : nl04 = 5.5e19 m^-2, Agilent S.A. triggered at 1.2 sec |
| Jul 10 2012 10:38:08:057AM | 1120710007 | Seung Gyou Baek | Plh = 500 kW,
next : will repeat to match Plh to 600 kW |
| Jul 10 2012 10:54:12:837AM | 1120710009 | Seung Gyou Baek | shot ran, density rise due to GPI, had some density scan
next: 3-(5), USN, nl04 = 7e19 m^-2 without GPI |
| Jul 10 2012 11:18:26:127AM | 1120710009 | Seung Gyou Baek | 30 MHz sidebands are seen. the sidebands do not appear to be strong to cause pump depletion.(-20 dB), although they appear to be grow when they reach inside.
next : increase the outer gap with same parameters |
| Jul 10 2012 11:26:13:517AM | 1120710010 | Seung Gyou Baek | shot ran, still 30 MHz sidebands.
next: increase the outer gap to lower the density in front of the grill |
| Jul 10 2012 11:45:15:850AM | 1120710011 | Seung Gyou Baek | shot ran
next : move to 3-(6), nl04=5.5e19 m^-2 |
| Jul 10 2012 12:01:47:143PM | 1120710012 | Seung Gyou Baek | shot ran
next : move to step 4. Inner wall limited |
| Jul 10 2012 12:16:08:553PM | 1120710013 | Seung Gyou Baek | 70 MHz peak at the beginning of LH but disappears.
next: back to USN, high density case, increase the outer gap to drop the density in front of the grill |
| Jul 10 2012 12:31:10:290PM | 1120710014 | Seung Gyou Baek | shot ran, with increased gap
next: turn off the cryo pump and repeat the discharge to check whether it can lower the density in front of the grill. |
| Jul 10 2012 01:00:02:237PM | 1120710016 | Seung Gyou Baek | shot ran
next : Ian's run. Thank you. |
| Jul 10 2012 01:20:31:110PM | 1120710017 | Ian Faust | Great start to a great run. No plasma. Seems to be a TF issue (just got done with a cooling problem which is why the extended recool). |
| Jul 10 2012 01:42:48:887PM | 1120710018 | Ian Faust | Beam problems + breach. Locked mode successful. Lasted till rampdown 1.6s. |
| Jul 10 2012 03:18:37:660PM | 1120710022 | Ian Faust | .4= Vloop
LH was done using previous settings. Improper timing, and phase. HiReX has wrong timing. Should have an interesting ohmic part to look at. Next shot correct and retry. No MSE/DNB. HXR is strong. |
| Jul 10 2012 03:35:37:600PM | 1120710023 | Ian Faust | Good Plasma. No MHD. 75 degree phasing worked much better. Due to the confinement time change (being smaller than expected ) we are dramatically increasing the injections for shot 24 |
| Jul 10 2012 04:11:13:730PM | 1120710025 | Ian Faust | Max power. Coupling did not seem to change. Locking before LHCD injection at .7 density is lower between 25 vs 24. Mode period looks suprising similar. No high order mhd behavior as seen in non-locked shots... Look to increase density to prevent lock and try again. Looking to lower power soon than later. |
| Jul 10 2012 04:28:12:003PM | 1120710026 | Ian Faust | Increase in the density causes nl_04 to go above 5e19 and drops to 3. No locking. Will drop current to try to further the loop voltage as vloop is close but not actually zero... |
| Jul 10 2012 04:37:21:253PM | 1120710027 | Ian Faust | early disruption at .9. Locked plasma. No LH coupled. 400kA. Lesson learned.. Returning to 500kA and lowering LH power to complete scan... |
| Jul 10 2012 04:53:02:737PM | 1120710028 | Ian Faust | 30% less power than shot 26. Return to 500kA, drop in loop voltage. No low freqency 'bad' MHD. Drops out at 1.3 interestingly. Injections are beautiful. |
| Jul 10 2012 05:11:32:933PM | 1120710029 | Ian Faust | 350 kW. No transition to sawtooth free (seen on XTOMO5). As Steve points out, interesting injection effects on the nonthermal ECE. Great run everyone. Next time, we must have the requisite diagnostics. |
| Physics Operator Comments | |||
| Jul 9 2012 06:17:29:897PM | Steve Wolfe | Beginning setup for Run 1120710
Import seg1 from 1120705010 and increase PG4 from 20 to 40msec for cryo Note that pg3 peak at -.018sec is only 60V, which I may want to put back to 100V. For the am run, we're starting from LSN similar to 1120629013, seg2. Import that into seg2. This is programmed for -540kA, with a value at seg switch under 500kA, so it overshot and came back. Leave that alone, since it sort of worked. Change nl04 from 3.5e19 to 7e19. Decrease TF value at 1.6sec from 151 to 150kA (flat program). Build All. (took 12.8sec) Import seg2 from 1101019014 (USN) into seg3 Recalculate predictors for wires 1-8 Copy Ip and nl04 from trace in seg2 (LSN) Shorten flattop from 1.7 to 1.6sec in rcur, clearin, rxl, zxl (just move the 1.7sec point earlier) Turn off seg2 and on seg3 and build_all (took 7.1sec this time). Import seg2 from 1120612915 (Lim) to seg4. Change title to 0.54MA Limiter Seg3 off, Seg4 on and build_all (6.2sec) Seg 4 off, seg2 back on, rebuild (5.5 sec) Save as /home/wolfe/pcs_scratch/ 1120710111 That should be ok for the morning experiment tomorrow. Except that there are gas puffs on both B-side lower and H-bot in seg2 and seg4. Since I'm going to be using B-side lower (PG1) for argon, remove the H-bot (PG5) puffs and re-do the save. | |
| Jul 9 2012 06:36:53:980PM | Steve Wolfe | Continuing setup for Run 1120710
Setting up for Ian's half of the run Again import 1101019014 seg2, into seg2 this time Recalculate predictors on Wires 1-8 Extend gain to 2.5 sec on Wires 2,3,7,9,13,14,15. Turn on oh1_crossover procedure Import locked mode shot 1120607004, seg 4 into seg4. Build_all (seg1 and 2) Save as /home/wolfe/pcs/ 1120710222 Ok, that should be setup for the afternoon. | |
| Jul 9 2012 06:39:51:717PM | Steve Wolfe | Continuing setup for Run 1120710
Exit PCS/safe and bring up a live pcs Load from /home/wolfe/pcs_scratch/ 1120710111 Load at 9-Jul-2012 18:39:16.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Loaded and ready for tomorrow morning. | |
| Jul 10 2012 07:15:43:157AM | 1120710001 | Steve Wolfe | Shot#1: No-power data system cycle test Seems to have run through ok INIT was under 1 minute RECOOL seemed to complete in under 4 minutes No gas was enabled (and none fired) Ratiomatic may be ok again, reads .003mTorr |
| Jul 10 2012 08:28:03:990AM | 1120710001 | Steve Wolfe | Shot#2: Verified that the model is setup from my store yesterday. Seg2-4 have configuration for LSN, USN, LIM as requested for MP#664 Seg2 (LSN) is turned on. Seg1 is as Earl ran last week, except for 42msec on PG4 for cryopump. Should be ready to run. DNB reports the calorimeter and motor drive have been re-installed and are operational; no indication of what caused the fault last week. DNB not required for morning experiment, but will be needed in afternoon. JR reports that computer for HIREX-SR is unresponsive. Router had been unplugged. May need reboot. Problem has been resolved. |
| Jul 10 2012 09:11:58:923AM | 1120710002 | Steve Wolfe | Shot#2: Attempting LSN 7e19 300kW LH Case 1.1 Result: fizzle, late breakdown 7ms Ratiomatic is showing 2e10mTorr, seems to have gone berserk reads ok after the shot. Bz maybe a tad negative, Next: reduce pg4 from 42 to 38msec, EF4 from -1300 to -1290 Load at 10-Jul-2012 09:11:34.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done |
| Jul 10 2012 09:31:31:893AM | 1120710003 | Steve Wolfe | Shot#3: reduce pg4 from 42 to 38msec, EF4 from -1300 to -1290 Cooling is a little slow, coming up on 15minutes Result: plasma almost full length, disrupts in rampdown at 1.73sec better breakdown time, maybe a little bouncy ratiomatic reads .024mTorr, which seems low but it may need calibration Got LH ~200kW. Next: increase nl04 P gain from 6 to 9, D from 4 to 8 to try to keep density up (sagged to 6.6e19 Load at 10-Jul-2012 09:31:16.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done |
| Jul 10 2012 09:50:09:290AM | 1120710004 | Steve Wolfe | Shot#4: increase nl04 P gain from 6 to 9, D from 4 to 8 to try to keep density up Long delay for cooling and NINJA gas change. Result: plasma disrupts at 1.73sec, same as #3 Some marfing or something on Dalpha after 1.2sec LH starts at 600, sags and then recovers to 500kW density seems to be a little better this time, still sagging a little late. Next: Keep nl04 demand flat from 1.4 to 1.6sec Load at 10-Jul-2012 09:49:50.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done |
| Jul 10 2012 10:06:04:243AM | 1120710005 | Steve Wolfe | Shot#5: Keep nl04 demand flat from 1.4 to 1.6sec Move zcur down by 5mm, from -.015 to -.02 per LH request Load at 10-Jul-2012 09:55:34.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: fizzle, very late breakdown, 18msec Pressure dropped to .018mTorr? Fields look ok. Argon pressure is up a little Next: raise pg4 to 42msec Load at 10-Jul-2012 10:04:58.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done |
| Jul 10 2012 10:25:15:830AM | 1120710006 | Steve Wolfe | Shot#6: raise pg4 from 38 to 42msec From setup for #5: Keep nl04 demand flat from 1.4 to 1.6sec Move zcur down by 5mm, from -.015 to -.02 per LH request Result: plasma to 1.7 sec, still a little marfe around 1.2sec breakdown still a little late, around 6.4msec, LH between 500 and 600kW, couple of trips; density at bottom row of launcher is better (per Syunichi). Next: Reduce nl04 from 7 to 5.5e19, NINJA will also be puffing He |
| Jul 10 2012 10:38:20:950AM | 1120710007 | Steve Wolfe | Shot#7: Reduce nl04 from 7 to 5.5e19, NINJA will also be puffing He Load at 10-Jul-2012 10:26:39.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Plasma to 1.7sec, some early runaways, injection at .8sec Except for the injection, the density looks pretty close to target. LH around 500kW, with a fault around 0.7sec Bouncy startup. Next: reduce outer gap by 3mm, increase pg4 to 44msec |
| Jul 10 2012 10:52:24:420AM | 1120710008 | Steve Wolfe | Shot#8: Increase RCUR from .658 to .6595 to reduce outer gap by 3mm, increase pg4 tofrom 42 to 44msec Load at 10-Jul-2012 10:41:08.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: Plasma to 1.7 sec, small injection at 1sec density rising during pulse, PG3 is off after 0.6sec - NINJA? LH is flat at 600kW. Next: Go to Upper Null (Step 3) |
| Jul 10 2012 11:09:32:180AM | 1120710009 | Steve Wolfe | Shot#9: Go to Upper Null (Step 3) Segment 2 off, segment 3 on NINJA will be off Nl04 programmed for 7e19, extend nl04 flattop to 1.7sec May need to increase gains as before, but leave it for one shot Load at 10-Jul-2012 10:55:55.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: plasma full length (2sec), upper null LH~700kW, faulting late. Nl04 7e19 and flat. Next: increase outer gap by 4mm |
| Jul 10 2012 11:23:15:547AM | 1120710010 | Steve Wolfe | Shot#10: Reduce RCUR from .662 to .660 to increase outer gap by 4mm Load at 10-Jul-2012 11:11:39.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done plasma full length, plenty of hards during LH Density looks pretty good, late marfe Next: increase outer gap by 4mm more |
| Jul 10 2012 11:39:50:367AM | 1120710011 | Steve Wolfe | Shot#11: Reduce RCUR from .660 to 0.598 to increase outer gap by another 4mm Load at 10-Jul-2012 11:25:20.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done plasma full length, plenty of hards during LH pulse No LH faults Right gap up to ~18mm less of a marfe near EOF small bounce in startup Next: 5.5e19 and decrease outer gap by 4mm |
| Jul 10 2012 11:57:08:417AM | 1120710012 | Steve Wolfe | Shot#12: Nl04 from 7 to 5.5e19, Increase RCUR from 0.598 to .660 to decrease outer gap by 4mm Load at 10-Jul-2012 11:42:54.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Now waiting 15 minutes in recool, because scanner was ratcheting up LN2 main tank is down to 19in, truck is on the way Result: plasma full length, lots of xrays during LH nl04 not completely steady, may need to tweak gains Next: go to limiter case |
| Jul 10 2012 12:13:42:660PM | 1120710013 | Steve Wolfe | Shot#13: go to limiter case Seg 3 off, seg 4 ON Make nl04 trace flat to 1.6sec Load at 10-Jul-2012 11:59:45.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done plasma to 2sec, some early runaways slightly bouncy startup. Density is sagging a bit, no gas from .35 to 1.4sec, LH is dropping from 700kW to 500kW, but no faults Next: reload USN, 7e19 case with largest gap and increase gap 4mm more |
| Jul 10 2012 12:30:21:213PM | 1120710014 | Steve Wolfe | Shot#14: reload USN, 7e19 case with largest gap (shot#11) and reduce RCUR from .658 to .656 increase gap 4mm more Assume the startup will come back after the limiter shot Load at 10-Jul-2012 12:18:05.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done LN2 truck seems to have arrived, tank is filling Result: Marfes early and late in flattop, early one could be crossover? Right gap is over 20mm. Next: Turn off cryopump, reduce pg4 to 20msec |
| Jul 10 2012 12:48:57:830PM | 1120710015 | Steve Wolfe | Shot#15:Turn off cryopump, reduce pg4 to from 45 to 20msec Increase seg3 D gain on nl04 from 3 to 6; leave P gain at 8 Load at 10-Jul-2012 12:32:51.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done IGT=8e-7 in check Result: plasma full length, big marfe from 1.1 to 1.4, early injections nl04 was up to 1e20, pg3 is off after 0.3sec. Not sure why density comes up so high LH stayed on ok Next: Reduce nl04 to 6.5e19, leave cryopump off |
| Jul 10 2012 12:59:45:080PM | 1120710016 | Steve Wolfe | Shot#16: Reduce nl04 to 6.5e19, leave cryopump off No seg1 changes Load at 10-Jul-2012 12:50:23.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done plasma to 1.9sec, marfe late, but LH seemed to run ok before that No early injections this time. nl04 close to 7e19 Slight bump in startup, looks ok. Next: Go to Ian's half, starting with locked mode shot |
| Jul 10 2012 01:20:49:187PM | 1120710017 | Steve Wolfe | Shot#17: Go to Ian's half run, starting with locked mode shot Load from 1120710222 in ~/pcs_scratch Import seg01 from 1120710016 Seg2 off, Seg 4 ON (locked mode shot) Load at 10-Jul-2012 13:02:49.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Delay for cooling, TF peak temp; going on 20 minutes Result: No TF, no plasma Next: try that again, with field |
| Jul 10 2012 01:33:34:663PM | 1120710018 | Steve Wolfe | Shot#18: Another try at locked mode shot Load from 1120710222 in ~/pcs_scratch Import seg01 from 1120710016 Seg2 off, Seg 4 ON (locked mode shot) Result: plasma full length, locked mode as called for Next: Turn cryopump back on, Change to USN, low density case with LH |
| Jul 10 2012 02:19:15:550PM | 1120710019 | Steve Wolfe | Shot#19: Turn cryopump back on, Change to USN, low density case with LH Seg4 off, Seg2 ON PG4 from 20 to 44msec in seg1 Load at 10-Jul-2012 13:38:34.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done There is a problem with the beam, which is critical for this experiment Beamers are trying to work around. Go back to Baek's experiment for a few shots Reload shot#16 and raise density to 7e19 Load at 10-Jul-2012 14:07:51.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: Disrupted at 0.8sec, OH2L went before disruption Bounce in startup but survived (until the crowbar) |
| Jul 10 2012 02:44:51:623PM | 1120710020 | Steve Wolfe | Shot#20: If shot 19 hadn't disrupted, I'd raise pg4, but leave it alone and see it we can get a shot. Reduce nl04 P gain from 8 to 5 Load at 10-Jul-2012 14:37:20.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done plasma full length, lots of early runaways, Startup bounce is still there, need to raise the puff nl04 looks pretty good, small injections only Next: increase nl04 from 7 to 8e19 |
| Jul 10 2012 02:56:53:217PM | 1120710021 | Steve Wolfe | Shot#21: increase nl04 from 7 to 8e19 raise pg4 from 20 to 22msec Load at 10-Jul-2012 14:46:48.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done plasma full length, marfe during LH still bounces, no early hards. Next: Back to MP#710 Reload from 1120710222 and turn cryopump back on |
| Jul 10 2012 03:27:56:143PM | 1120710023 | Steve Wolfe | Shot#23: increase argon to 100msec Making changes to HIREX setup and LH program Load at 10-Jul-2012 15:12:49.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done plasma full length, Vloop=0.2 and flat to 1.7sec Current rise better this time, no idea why. Still bounces Next: Change LH program (higher power) |
| Jul 10 2012 03:46:57:193PM | 1120710024 | Steve Wolfe | Shot#24: Change LH program (higher power) No pcs changes plasma full length Loop voltage gets close to zero right after LH turn on, then goes back to ,1 to .2V LH gets 700kW Next: reduce outer gap by 2mm |
| Jul 10 2012 04:07:07:733PM | 1120710025 | Steve Wolfe | Shot#25: RCUR from .662 to .663 to reduce outer gap by 2mm Load at 10-Jul-2012 15:48:53.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done plasma full length, some early injections, but it survives through it. Loop voltage seems to be higher, up to .35V or so Outer gap is over 12mm. This shot has a locked mode from early Next: try raising the earlier density |
| Jul 10 2012 04:22:43:627PM | 1120710026 | Steve Wolfe | Shot#26: try increasing density to .6e20 at .25, then drop it back Load at 10-Jul-2012 16:10:17.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done plasma full length, but nl04 is over 4e19, falling through pulse Loop voltage falls to .17V near EOF, non-thermals ramping up. Plh ~750kW Next: Try 400kA |
| Jul 10 2012 04:37:20:227PM | 1120710027 | Steve Wolfe | Shot#27: Decrease Ip from 500 to 400ka starting at .234sec Increase pg4 from 45 to 48msec to try to get rid of bounces Also extend the ef4 current out past 1.7sec (was going to zero at 1.5sec) Load at 10-Jul-2012 16:26:41.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Disrupted at .9sec, No lh ? Marfe followed by injection. Gets a locked mode around 0.7sec Next: Back to 500kA and reduce LH power |
| Jul 10 2012 04:54:28:097PM | 1120710028 | Steve Wolfe | Shot#28: Back to 500kA and reduce LH power No seg 1 change Load at 10-Jul-2012 16:38:24.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done plasma to 2sec, some early runaways bounces worse than before loop voltage from .5 to .35V with LH at 500kW as nl04 falls from 5 to 3.5e19 EF2U is railing at zero current, losing vertical control Next: repeat with reduced LH |
| Jul 10 2012 06:07:24:050PM | 1120710029 | Steve Wolfe | Following the last shot, I turned off the oh1_crossover loadable procedure and loaded the shot, so it won't be on by default if the model is reused tomorrow. It's probably not a good idea to continue using this routine when it's not needed. Load at 10-Jul-2012 18:07:10.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 07:06:50:097AM | Test | Ok | cycle test |
| 2 | 09:01:39:200AM | Plasma | Ok | |
| 3 | 09:19:05:990AM | Plasma | Ok | |
| 4 | 09:41:09:083AM | Plasma | Ok | |
| 5 | 09:56:35:050AM | Plasma | Ok | |
| 6 | 10:16:48:183AM | Plasma | Ok | |
| 7 | 10:30:22:867AM | Plasma | Ok | |
| 8 | 10:44:32:720AM | Plasma | Ok | |
| 9 | 11:01:15:547AM | Plasma | Ok | |
| 10 | 11:16:24:233AM | Plasma | Ok | |
| 11 | 11:32:48:777AM | Plasma | Ok | |
| 12 | 11:49:48:820AM | Plasma | Ok | |
| 13 | 12:07:03:303PM | Plasma | Ok | |
| 14 | 12:23:19:957PM | Plasma | Ok | |
| 15 | 12:38:40:890PM | Plasma | Ok | |
| 16 | 12:54:50:627PM | Plasma | Ok | |
| 17 | 01:17:15:877PM | Plasma | Bad | No TF |
| 18 | 01:29:35:700PM | Plasma | Ok | |
| 19 | 02:12:29:877PM | Plasma | Bad | Commutation Failure fault on OH2 and EF1 |
| 20 | 02:37:50:457PM | Plasma | Ok | |
| 21 | 02:50:59:757PM | Plasma | Ok | |
| 22 | 03:03:53:457PM | Plasma | Ok | |
| 23 | 03:21:07:697PM | Plasma | Ok | |
| 24 | 03:38:49:243PM | Plasma | Ok | |
| 25 | 03:55:48:437PM | Plasma | Ok | |
| 26 | 04:13:20:490PM | Plasma | Ok | |
| 27 | 04:30:12:940PM | Plasma | Ok | |
| 28 | 04:43:21:687PM | Plasma | Ok | |
| 29 | 04:58:20:070PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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