| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Dennis Whyte,Dennis Whyte |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Andy Pfeiffer,Bill Byford,Gary Dekow |
| Engineering Operator Run Comment |
| MP 419 Wall pumping measurements with cryopumping Session leaders: D. Wh |
| Session Leader Plans |
| Entered: Dec 2 2009 08:01:18:450PM |
| Author: Dennis Whyte |
| MP 419
Wall pumping measurements with cryopumping Purpose: Ascertain the differences in wall pumping rates and retention dynamics when using the upper cryopump as compared to shots without cryopumping. Background: A large set of experiments have been performed on wall pumping (fuel retention) using the static particle balance method. That experimental campaign used repeated discharges with no disruptions, and methodically changed plasma conditions to see the effect on shot-averaged retention. These experiments showed retention scaled proportional to incident ion fluence and was likely occurring at divertor surfaces which were primarily cleaned of B layers. At the same time, analysis of previous experiments that tested the upper cryopump showed that most often the retention rate during flattop, diverted stages was ~zero, in apparent contradiction to the physics interpretation of the static experiments. This experiment naturally repeats/extends the previous work in the retention MP419 to explore the effect of cryopumping on retention with the added information gained from dynamic particle balance. Approach ------------- Gate valves are closed throughout shot and until the cryopump regenerates (typically 4-5 minutes after shot). Repeated shots at fixed flattop density to gain information about repeatable retention rates and/or saturation of the retention. Will then scan (primarily) density, ssep or RF power to see effect on retention It is critical to avoid disruptions in rampdown since these are known to desorb large quantities of fuel from the wall, thus perturbing the experiment. Plasma startup and rampup are quite different with the cryo, so we'll use a more recent shot as our reference shot from I-mode experiments where cryo was used routinely. Experiment --------------- Cryopump ON or available entire run Gate valves closed until cryo regenerates after shot RGA bypass to assess gas content TF: ~5.4 Tesla (normal direction) Ip: ~0.8 - 1 MA (normal direction) Working gas: D2 Density: NL04 ~ 0.4 - 1.2 e20 Equilibrium condition: Reference shot (recent) 1091016029 (USN) BUT make change to flattop Ip = 0.8 MA, Bt = 5.4 T. NL04~0.6e20 for first shot RF: < 3 MW Diagnostics --------------- - Bypassed RGA - Verify long-time digitization of in-vessel pressure. Shot plan ------------- Ohmic -------- 1. Develop USN shape from reference, move strikepoint outboard ~2 cm to match pump entrance. - Ip = 0.8 MA, Bt = 5.4 T. NL04~0.6e20, SSEP ~ 1 cm, no RF - assure density control through startup and rampup - assure no disruptions in rampdown 2. ~4-5 repeat shots each at NL04~0.6e20 to assure that the retention is not changing from shot to shot. 3. Repeat x2-3 at NL04 ~ 0.9e20 4. Repeat x2-3 at NL04 ~ 1.2e20 5. Return to intermediate density to see retention evolution x2-3 NL04 ~ 0.9e20 and prepare for ssep scan. 6. SSEP scan at fixed NL04~0.9e20. This will vary both strikepoint locations and vary the relative amount of pumping in upper divertor a) SSEP = +10 mm x2 b) SSEP = 0 mm x2 c) SSEP = -10 mm x2 d) SSEP = -20 mm x2 7. Fiducial shot with no pumping at SSEP -20 mm (LSN) - ALL early fixed gas programming turned off! Feedback density control only 8. Repeat 6 with 1 to 1.5 MW of ICRF at fixed density: target NL04~0.9e20 a) SSEP = +10 mm x2 b) SSEP = 0 mm x2 c) SSEP = -10 mm x2 d) SSEP = -20 mm x2 |
| Entered: Dec 3 2009 12:43:42:823PM |
| Author: Dennis Whyte |
| Characterization and Optimization of I-mode
---------------------------------- Day 3 The purpose of these experiments is to characterize the necessary parameters to obtain I-mode (a.k.a. enhanced L-mode) while documenting I-mode plasma characteristics and optimizing I-mode towards its application in Alcator C-Mod for high confinement at low density. The experiment will focus on expanding the available I-mode operating space by exploring the effects of shaping, density, q95, and Ip with a goal of obtaining basic scaling relationships for further use on C-Mod and possible exploration on other devices. Reference shot: start at 1091016033 which was a good I-mode shot Cryopump ON Toroidal Field: 5.0 - 5.8 T (clockwise) Plasma Current: 0.8 - 1.4 MA Working Gas Species: D2 Density: Target NL04 densities from 0.3 to 1 (1e20) Boronization Requested: NO ICRF Power: > 5 MW, Each shot will have 4 steps in RF of 200 ms each. Diagnostics: ECE with varying B field Edge TS with alignment for pedestal/edge as reference shot Note: DNB is offline so no pedestal diagnosis available from CXRS Run Plan -------- focus today on getting the density dependence 4. Density scan at high Ip / low q95 N.B. ordering of density scan is reversed from MP Reference shape: #1080416015, Ip = 1.35 MA, Bt = 5.63 T 6 shots a) NL04 = 0.5e20, Prf steps: 4.3, 4.6, 4.9, 5.2 (or lowest density achievable) b) NL04 = 0.6e20, Prf steps: 4.3, 4.6, 4.9, 5.2 c) NL04 = 0.7e20, Prf steps: 4.3, 4.6, 4.9, 5.2 d) NL04 = 0.8e20, Prf steps: 4.3, 4.6, 4.9, 5.2 e) NL04 = 0.9e20, Prf steps: 4.3, 4.6, 4.9, 5.2 f) NL04 = 1.0e20, Prf steps: 4.3, 4.6, 4.9, 5.2 5. Density scan at low Ip / high q95 (3b forms part of scan) Reference shape: #1080416015, Ip = 1.0 MA, Bt = 5.63 T 6 shots a) NL04 = 0.3e20, Prf steps: 3.1, 3.2, 3.3, 3.4 (or lowest density achievable) b) NL04 = 0.4e20, Prf steps: 3.1, 3.2, 3.3, 3.4 c) NL04 = 0.5e20, Prf steps: 3.1, 3.2, 3.3, 3.4 d) NL04 = 0.6e20, Prf steps: 3.1, 3.2, 3.3, 3.4 e) NL04 = 0.7e20, Prf steps: 3.1, 3.2, 3.3, 3.4 f) NL04 = 1e20, Prf steps: 3.1, 3.2, 3.3, 3.4 When we get through this we move the "shaping study" 6. Increase κ to ~1.7, same triangularity ~ 0.6 as Day 1 (Circle 2 Fig. 3) 3 shots a) Ip = 1 MA, Bt = 5.63 T, q95 ~ 3.9, NL04 = 0.8e20, Prf steps: 3.1, 3.2, 3.3, 3.4 b) Ip = 1 MA, Bt = 5.63 T, q95 ~ 3.9, NL04 = 0.5e20 (or lowest possible) , Prf steps: 3.1, 3.2, 3.3, 3.4 c) Ip = 1.35 MA, Bt = 5.63 T, q95 ~ 2.9, NL04 = 0.8e20, Prf steps: 4.3, 4.6, 4.9, 5.2 7. Increase κ to ~1.8 (or max.), same triangularity ~ 0.6 as Day 1 (Circle 3 Fig. 3) 3 shots a) Ip = 1 MA, Bt = 5.63 T, q95 ~ 3.9, NL04 = 0.8e20, Prf steps: 3.1, 3.2, 3.3, 3.4 b) Ip = 1 MA, Bt = 5.63 T, q95 ~ 3.9, NL04 = 0.5e20 (or lowest possible) , Prf steps: 3.1, 3.2, 3.3, 3.4 c) Ip = 1.35 MA, Bt = 5.63 T, q95 ~ 2.9, NL04 = 0.8e20, Prf steps: 4.3, 4.6, 4.9, 5.2 8. Keep κ at ~1.8 (or max.), increase triangularity to 0.8 (Circle 4 Fig. 3) 3 shots a) Ip = 1 MA, Bt = 5.63 T, q95 ~ 3.9, NL04 = 0.8e20, Prf steps: 3.1, 3.2, 3.3, 3.4 b) Ip = 1 MA, Bt = 5.63 T, q95 ~ 3.9, NL04 = 0.5e20 (or lowest possible) , Prf steps: 3.1, 3.2, 3.3, 3.4 c) Ip = 1.35 MA, Bt = 5.63 T, q95 ~ 2.9, NL04 = 0.8e20, Prf steps: 4.3, 4.6, 4.9, 5.2 9. Reduce κ to ~1.7 (or max.), keep triangularity at 0.8 (Circle 5 Fig. 3) 3 shots a) Ip = 1 MA, Bt = 5.63 T, q95 ~ 3.9, NL04 = 0.8e20, Prf steps: 3.1, 3.2, 3.3, 3.4 b) Ip = 1 MA, Bt = 5.63 T, q95 ~ 3.9, NL04 = 0.5e20 (or lowest possible) , Prf steps: 3.1, 3.2, 3.3, 3.4 c) Ip = 1.35 MA, Bt = 5.63 T, q95 ~ 2.9, NL04 = 0.8e20, Prf steps: 4.3, 4.6, 4.9, 5.2 10. Steady demonstration shot Type #1: �??ITER q=3�?? 4 shots Bt=5.4 T, q95~3, shape: TBD Variables (influenced on parameter scan results of 2-4. - target density: NL04 ~ 0.5-0.7 to reduce pedestal collisionality to ITER target 0.08 - RF: constant through shot, ~ 4.5 - 5 MW 11. Steady demonstration shot Type #2: Low collisionality AT / LH target 4 shots Bt= TBD, q95~4, shape: TBD Variables (influenced on parameter scan results of 2-4. - target density: minimum possible NL04 ~ 0.5-0.7 - RF: constant through shot, ~ 3.5 - 4 MW |
| Physics Operators Plans |
| Entered: Dec 2 2009 04:55:38:013PM |
| Author: Robert Granetz |
Engineering setup for Thursday 2009/12/03
MP419 - Wall pumping measurements with cryopumping
Session leaders: D. Whyte
Physics operator: R. Granetz
Overnight: usual ECDC in D2 and 60 C bake
Run will start at 09:00 and end at 17:00.
Power systems as on 1091016029 (USN), but change Ip to 0.8 MA, Btor to 5.4 T,
and nl_04 to 0.6e20 m-2)
A-coil configuration: +Dtop -Dbot -Jtop +Jbot; Enabled (standard
configuration)
Gas Setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar Hybrid DISABLED (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3)
leave NINJA as is DISABLED
Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo
Torvac setup: keep gate valves CLOSED during PULSE, and remaining closed
after the shot until the cryopump regenerates (typically 5 minutes)
Specific diagnostics: RGA (using bypass, since the gate valves will be
closed during and after each shot); in-vessel neutral pressure must be
digitized for at least the first 5 minutes after each shot
------------------------------------------------------------------------------
Boronization: no
ICRF Setup: Prf <= 3 MW
LH Setup: no
DNB: no
Cryopump: yes, ready for the start of the run
------------------------------------------------------------------------------
Run plan: Load seg 2 from seg 2 of 1091016029, but set Ip to 0.8 MA,
Btor to 5.4 T, and nl_04 to 0.6e20 m-2. Load seg 1 with seg 1 of
a recent startup with the cryopump on (1091202030). Have the cryopump
on for the first shot. During the run we will vary the density, the
RF power, and the equilibrium (USN, DN, LSN).
|
| Session Leader Summaries |
| Entered: Dec 3 2009 05:56:24:753PM |
| Author: Dennis Whyte |
| Very "interesting" day.
Wall pumping experiment was a bust due to broken c-side plenum gauge Finally got I-mode experiment going at about 1:30 (first shot #8) We got a lot of very nice data today on I-mode triggering and H-mode avoidance. Lessons / highlights: - triangularity matters. I-mode access was easier at higher upper tri. as seen by turning off the strikepoint sweep (which did not melt divertor) - sawtooth control is paramount in avoiding H-mode, i.e. we need to use off-axis ICRH to decrease sawtooth period. The "gap" between I-mode and H-mode disappeared when we were at 5.3 T and on-axis heating. Moving ICRH off axis with higher B (and keeping q low by increasing Ip) gave us nice I-modes (see #12 and #20) as best examples. This is clearly affecting our H-mode access results. Shot 21 showed that higher B was even better to reduce sawtooth size. - simultaneous QQC observations on reflectometry, magnetic and PCI on shot 20 (1.3 MA, 5.8 T) - Shot 20 is a performance record for I-mode: Wth ~ 220 kJ, 1.6e14 n/s. And this shows somewhat contradictory behaviour of Imode for particle confinement, which is easy to see because the L-I transition is SO sharp here at fixed Prf. The Prad takes a sudden turn downward and the QQC mode is clear...YET at the same time the core density increases from its demand value and the external fuelling turns off despite the very strong cryopumping!!?? - Shot 21 at 6 Tesla and small sawteeth would have probably been better but was under-powered at 7 MW total input power (no H-mode!). It appear the I-mode is triggered by a sawtooth, and possibly its threshold was affect by a slow upward drift in triangularity through the flattop. |
| Physics Operator Summaries |
| Entered: Dec 3 2009 09:43:27:300PM |
| Author: Robert Granetz |
Run summary for Thursday 2009/12/03
am: MP419 - Wall pumping measurements with cryopumping
pm: MP579 - Characterization and optimization of I-mode
Session leaders: D. Whyte
Physics operator: R. Granetz
Although the tokamak, RF, and cryopump systems all ran well today, a
pressure gauge on the main fueling plenum was found to be inoperative. (It
may have been faulty for the entire campaign.) Since this was a key
diagnostic for the wall pumping measurements, the initial miniproposal was
abandoned after 5 shots. We spent about 2 hours trying to determine the
problem, as well as the status of the other plenum gauges, but could not
resolve the problem or effect a short-term solution. So at midday we
switched to finishing up the recent I-mode plasma runs, although we had a
slow start due to a network problem in the cell which cost us another
half-hour. In the 2nd half-day we ran a number of different currents
(0.8-1.3 MA), toroidal fields (5.3-6.0 T), and densities (nl_04 =
0.6-1.2e20 m-2). See the session leader's summary for more information on
the I-mode performance.
Scorecard: 17 plasmas
1 duds
2 fizzles
0 power supply tests
1 no-power MDS shot cycles
--------------
Total: 21 shot cycles
|
| Session Leader Comments | |||
| Dec 3 2009 09:07:39:353AM | 1091203001 | Dennis Whyte | Fizzle |
| Dec 3 2009 09:45:05:167AM | 1091203002 | Dennis Whyte | NL04 ~ 0.65
Very nice constant density Will now work to fix strikepoint position closer to pump entrance. However a major problem with the C-side plenum. It does not seem to be working at all, i.e. it does not tell us the absolute change in the fuelling plenum pressure so we don't know how much we're fuelling through the shot. |
| Dec 3 2009 09:46:31:527AM | 1091203003 | Dennis Whyte | NL04 ~ 0.65
Strikepoint was pulled over, but need to get rid of jog in OSP position. Cryopumping and regen working very nicely C-side not working. |
| Dec 3 2009 12:10:04:213PM | 1091203005 | Dennis Whyte | NL04 ~ 0.65
Great strikepoint location and density control Use this as target for eventual completion of this MP. Unfortunately we have no C-side plenum... |
| Dec 3 2009 02:21:26:080PM | 1091203008 | Dennis Whyte | First shot in I-mode run
Got a beauty I-mode transition at 1.33 s Edge Te jumps factor of 50% very suddenly, neutrons up to 1e14 /s Target density is 0.9e20, but jumps to 1e20 with RF onset Missed transition with reflectometry We were getting mini H-modes before I-mode |
| Dec 3 2009 02:32:24:427PM | 1091203009 | Dennis Whyte | Early impurity injections.
I-mode at 1.33 s, H98~1 @ NL04=1e20 No H-mode As in the last run I'm getting suspicious that our OSP scan, i.e triangularity scan, is having an effect on the I-mode transition Will get rid of this sweep in next shot... |
| Dec 3 2009 03:02:25:317PM | 1091203011 | Dennis Whyte |
I-mode at 1.05 s, Prf 5 MW H98~1.05 @ NL04=1.1 e20 H-mode in final step, but an impurity injection temporarily killed I=mode We got I-mode at lower power on this shot that 9. I think this is confirming the suspicion that the triangularity was playing a role in the I-mode access. Interesting data on upper divertor probes at I-mode looks like broad L-mode profile |
| Dec 3 2009 03:15:02:033PM | 1091203012 | Dennis Whyte | I-mode at 0.95 s, Prf 5.1 MW H98~1.0 @ NL04=1.1 e20
Increased B to move GPC to optimal pedestal position H-mode at 1.4 s A bit worried that RF is putting impurities into I-mode Matt says increase at 1.3 s in Prad is not Moly |
| Dec 3 2009 03:15:18:643PM | 1091203012 | Dennis Whyte | I-mode at 0.95 s, Prf 5.1 MW H98~1.0 @ NL04=1.1 e20
Increased B to move GPC to optimal pedestal position H-mode at 1.4 s A bit worried that RF is putting impurities into I-mode Matt says increase at 1.3 s in Prad is not Moly next: target NL04=1.1 |
| Dec 3 2009 03:45:10:580PM | 1091203014 | Dennis Whyte | NL04~1.2e20
No I-mode H-modes It seems the gap between I-mode and H-mode narrows with increasing density Next: try lower density |
| Dec 3 2009 04:19:12:847PM | 1091203017 | Dennis Whyte | NL04~0.9e20
B~5.33 Tesla, q95~3.1 Brief I-mode but we're getting a lot of ELM like events in the edge which are tripping out RF Next: Increase density |
| Dec 3 2009 04:51:50:847PM | 1091203019 | Dennis Whyte | NL04~1.1e20
B~5.33 Tesla, q95~3.1 Brief I-mode again, but immediately goes into H-mode Wukitch points out that at 5.33 Tesla our ICRF is right on axis and our sawteeth are much larger than at >5.6 T (c.f. shot 12 today) In other words our exploration of H-mode avoidance seems to be coming down to sawtooth control Next: Increase B and I to move ICRH off-axis, and keep same q95~3.1 |
| Dec 3 2009 05:12:53:940PM | 1091203020 | Dennis Whyte | NL04~1.e20
B~5.8 Tesla, Ip~ 1.3 MA, q95~3.15 Very nice Imode from 1.05 to 1.25 when it is ruined by a sawtooth triggered H-mode But sawteeth are much smaller in amplitude with this off axis heating which was the idea. 1.2 s, 1.5 n/s, Wth ~ 219 kJ, Te_ped ~ 1 keV A very interesting observation is that we start to lose active density control when the I-mode starts, and we get an unrequested increase in density despite strong cryopumping. So while nothing like H-mode there is some amount of particle barrier forming here. Clear signs of QQC mode on PCI, reflectometery and magnetics on same shot! (first time I think) |
| Dec 3 2009 05:25:48:080PM | 1091203021 | Dennis Whyte | NL04~1.e20
B~6 Tesla, Ip~ 1.3 MA, q95~3.25 No H-mode Brief I-mode at 1.45 seconds. Amazing difference from last shot by just changing B from 5.8 to 6.0 Tesla! Sawtooth have shorter period and are less perturbing to edge Te. No H-mode up to Prf= 5.4 MW and 1.6 MW OH It would seem this is the way to go in the future to avoid H-mode. This just needed more power (RF was very happy) |
| Physics Operator Comments | |||
| Dec 3 2009 09:08:07:493AM | 1091203001 | Robert Granetz |
Shot 01 -- Fizzle. Pre-fill pressure might be a bit high, but it's within the range that we were
running yesterday. (Cryopump is on.)
Next shot: reduce pre-fill puff to 57 ms (from 65 ms)
|
| Dec 3 2009 09:25:15:463AM | 1091203002 | Robert Granetz | Shot 02 -- Plasma, full length. 0.8 MA, 5.4 T, 0.6e20 m-2, USN, ohmic. Good startup. No hard x-rays. Next shot: move RXU out by 2 cm to move the outboard strikepoint out by a similar amount. |
| Dec 3 2009 09:41:18:730AM | 1091203003 | Robert Granetz |
Shot 03 -- Plasma, full length. 0.8 MA, 5.4 T, 0.66e20 m-2, USN, no hard x-rays.
Plenum pressure signals are suspect. Upper outboard strikepoint did indeed
move out 2 cm.
Cell access to check on plenum pressure signals.
Next shot: tweak RXU programming to remove waggle
|
| Dec 3 2009 10:18:58:450AM | 1091203004 | Robert Granetz |
Shot 04 -- Plasma, full length. 0.8 MA, 5.4 T, 0.67e20 m-2, USN. Ohmic. No runaways.
Good RXU control. The attempted fix to the plena pressure signal cables didn't work.
Another cell access to continue debugging the plena pressure signals.
Next shot: reduce nl_04 programming to 0.54e20 m-2 to reduce density a bit
|
| Dec 3 2009 10:37:47:323AM | 1091203005 | Robert Granetz |
Shot 05 -- Plasma, full length. 0.8 MA, 5.4 T, 0.6e20 m-2, USN. Ohmic. No runaways.
Good RXU control. The attempted fix to the plena pressure signal cables didn't work.
Another cell access to continue debugging the plena pressure signals.
Next shot: repeat, no changes
|
| Dec 3 2009 12:13:53:963PM | 1091203005 | Robert Granetz | After testing the plena pressure gauges after shot 5, we have concluded that they are not working properly, and it would take too long to make a hardware fix. So we're going to switch to an I-mode run, MP579, since Dennis is the session leader today anyway. |
| Dec 3 2009 12:43:53:540PM | 1091203006 | Robert Granetz | For shot 6, we will start from a successful I-mode shot and then do a density scan. Load seg 2 from shot 1091016033 seg 2. Cryopump on. Fill B-side-lower with 1.1 psi of neon. Turn on RF. |
| Dec 3 2009 12:45:15:057PM | 1091203006 | Robert Granetz | Shot 06 -- no power shot due to some INIT failures Next shot: try again; keep torus gate valves open (forgot to switch this back) |
| Dec 3 2009 01:10:53:667PM | 1091203006 | Robert Granetz | A network problem caused problems in INIT with the RF FFT computer. Josh says that it's a more general network problem than just the FFT computer. He's working on it. |
| Dec 3 2009 02:06:07:847PM | 1091203007 | Robert Granetz |
Shot 07 -- Plasma, full length. 1.2 MA, 5.6 T, 1.0e20 m-2, USN. Cryopump on. Prf=4.0-4.8 MW (stepped) from
D+E+J. No early hard x-rays. Laser blowoff injections occurred at
t=0.8 and 1.2 s.
Next shot: decrease nl_04 to 0.9e20 m-2
|
| Dec 3 2009 02:13:07:660PM | 1091203008 | Robert Granetz |
Shot 08 -- Plasma, full length. 1.2 MA, 5.6 T, 1.0e20 m-2, USN, cryopump on. No LBO (at session leader's
request). Prf=4.0-4.8 stepped. I-mode starts at t=1.3 s.
Next shot: no DPCS changes; increase Prf; NINJA will puff D2 after t=1.2 s
|
| Dec 3 2009 02:33:02:910PM | 1091203009 | Robert Granetz |
Shot 09 -- Plasma, full length. 1.2 MA, 5.6 T, 0.9-1.0e20 m-2, USN, cryopump on. Prf=4.4-5.1 MW, stepped.
Next shot: tweak RXU programming to make it more constant; put 1 psi of argon into the H-bottom plenum, enable
that valve, and program a 50 ms pulse into wire 17 (H-bot valve) starting at t=0.3 s
|
| Dec 3 2009 02:40:20:940PM | 1091203010 | Robert Granetz |
Shot 10 -- Fizzle. The H-bottom valve started spitting gas as soon as we went into pulse. This was the
first attempt to use it during plasma operation this year, and apparently it has a problem.
Next shot: disable the H-bottom valve
|
| Dec 3 2009 02:54:34:427PM | 1091203011 | Robert Granetz |
Shot 11 -- Plasma, full length. 1.2 MA, 5.6 T, 1.0-1.1e20 m-2, USN, cryopump on. Prf=4.7-5.9 MW, stepped.
Lots of early hard x-rays.
Next shot: increase Btor by 0.07 T (2 kA) for better edge GPC coverage; increase pre-fill by 4 ms.
|
| Dec 3 2009 03:09:59:800PM | 1091203012 | Robert Granetz |
Shot 12 -- Plasma, full length. 1.2 MA, 5.6 T, 1.0e20 m-2, USN, cryopump on. Prf=4.8-5.4 MW, stepped.
Some early hard x-rays.
Next shot: increase pre-fill another 2 ms; increase nl_04 to 1.1e20 m-2
|
| Dec 3 2009 03:24:22:393PM | 1091203013 | Robert Granetz |
Shot 13 -- Plasma, disrupted in rampdown. 1.2 MA, 5.6 T, 1.1e20 m-2, USN, cryopump on. Prf=4.6-5.6 MW, stepped.
Almost no early hard x-rays.
Next shot: decrease pre-fill by 10 ms (disruption recovery); increase nl_04 to 1.2e20 m-2
|
| Dec 3 2009 03:36:23:753PM | 1091203014 | Robert Granetz |
Shot 14 -- Plasma, full length. 1.2 MA, 5.6 T, 1.2e20 m-2, USN, cryopump on. Prf=4.7-5.4 MW, stepped.
Early hard x-rays.
Next shot: set nl_04 to 0.8e20 m-2; increase pre-fill by 6 ms (to 59 ms)
|
| Dec 3 2009 03:54:26:377PM | 1091203015 | Robert Granetz |
Shot 15 -- Plasma, full length. 1.2 MA, 5.6 T, 0.9e20 m-2, USN, cryopump on. Prf=4.8-5.4 MW, stepped.
Early hard x-rays.
Next shot: nl_04 to 0.9e20 m-2; decrease Itor to 148235 A (5.3 T); increase pre-fill another 3 ms
|
| Dec 3 2009 04:08:07:393PM | 1091203016 | Robert Granetz | Shot 16 -- Plasma, short and disruptive. Blame it on an early injection. Next shot: repeat, no changes |
| Dec 3 2009 04:18:19:113PM | 1091203017 | Robert Granetz |
Shot 17 -- Plasma, full length. 1.2 MA, 5.35 T, 1.0e20 m-2, USN, cryopump on. Prf=4.8-5.4 MW, stepped.
RF wasn't happy. No arly hard x-rays.
Next shot: increase nl_04 to 1.05e20 m-2
|
| Dec 3 2009 04:28:26:097PM | 1091203018 | Robert Granetz | Shot 18 -- Dud. No EF4. Next shot: repeat, no changes |
| Dec 3 2009 04:51:15:800PM | 1091203019 | Robert Granetz |
Shot 19 -- Plasma, disrupted at t=1.13 s. 1.2 MA, 5.35 T, 1.0-1.1e20 m-2, USN, cryopump on. Prf=4.8-5.0 MW, stepped.
Lots of early hard x-rays.
Next shot: reduce pre-fill by 9 ms (disruption recovery); increase Btor to 5.8 T, increase
Ip to 1.3 MA, set nl_04 to 1.0e20 m-2
|
| Dec 3 2009 04:58:50:783PM | 1091203020 | Robert Granetz |
Shot 20 -- Plasma, full length. 1.3 MA, 5.8 T, 1.0e20 m-2, USN, cryopump on. Prf=4.8-5.4 MW, stepped.
Only a few early hard x-rays.
Next shot: increase Btor to 6.0 T
|
| Dec 3 2009 06:50:02:190PM | 1091203021 | Robert Granetz |
Shot 21 -- Plasma, full length. 1.3 MA, 6.0 T, 1.0e20 m-2, USN, cryopump on. Prf=4.3-5.4 MW. Lots of
early hard x-rays.
End of run
|
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:03:06:290AM | Plasma | Ok | |
| 2 | 09:15:58:260AM | Plasma | Ok | |
| 3 | 09:28:52:950AM | Plasma | Ok | |
| 4 | 10:06:28:213AM | Plasma | Ok | |
| 5 | 10:25:03:167AM | Plasma | Ok | |
| 6 | 12:41:30:087PM | Plasma | Bad | Critical Failure Cryo valve closed |
| 7 | 01:50:19:863PM | Plasma | Ok | |
| 8 | 02:05:01:080PM | Plasma | Ok | |
| 9 | 02:19:36:113PM | Plasma | Ok | |
| 10 | 02:34:04:237PM | Plasma | Bad | H-Bottom Piezo Did Work Correctly |
| 11 | 02:46:59:143PM | Plasma | Ok | |
| 12 | 02:59:49:360PM | Plasma | Ok | |
| 13 | 03:13:06:707PM | Plasma | Ok | |
| 14 | 03:30:44:380PM | Plasma | Ok | |
| 15 | 03:44:33:253PM | Plasma | Ok | |
| 16 | 03:58:59:550PM | Plasma | Ok | |
| 17 | 04:12:00:080PM | Plasma | Ok | |
| 18 | 04:25:11:940PM | Plasma | Ok | |
| 19 | 04:38:37:317PM | Plasma | Ok | |
| 20 | 04:51:52:893PM | Plasma | Ok | |
| 21 | 05:04:46:720PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Dec 3 2009 09:02:41:307AM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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