| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Brian Labombard |
| Physics operator(s): | Ian Hutchinson |
| Engineering operator(s): | Ed Fitzgerald,Sam Pierson,Gary Dekow |
| Engineering Operator Run Comment |
| MP#475 Cryopump Startup PO:Hutchinson SL:Labombard EO:Fitzgerald,Pierson |
| Session Leader Plans |
| Entered: May 24 2007 02:33:08:250PM |
| Author: Brian Labombard |
| Run Plan for 1070525 MP#475 ""Cryopump Startup"" Goal Complete three cryopump commissioning phases, called out in MP#475: Phase I ""System Assembly and Checkout"" Phase II ""Cool-down/Regeneration and Pumping Speed Benchmarks"" Phase III ""Operation during C-Mod Discharge"" Plan We will begin cooldown of the cryopump at around 7:00AM in anticipation for a full day of cryopump operation. First we will perform some simple pumping speed tests, puffing in D2 via the NINJA system and operating with the torus gatevalves closed. We will also perform a series of pump/regeneration cycles to get familiar with how the pump behaves. Once we are satisfied that we have control, we will begin operation of the pump in C-Mod plasmas. First we will try LSN discharges with no or weak pumping. Then we will move on to USN plasmas, which should exhibit strong pumping. Plan (1) No-power shot cycles with gatevalves closed. Pump/regen cycles. Benchmarks. (2) Reload from shot#1070511025, turn on segment#2 (LSN). Program NL04 = 0.8e20 Operate with pump warm (20 deg K) and cold. Assess neutral pressures and pumping speeds. (3) Turn on segment#3 (LSN). Program NL04 = 0.8e20 Operate with pump warm (20 deg K) and cold. Assess neutral pressures and pumping speeds. |
| Physics Operators Plans |
| Entered: May 24 2007 02:30:50:063PM |
| Author: Brian Labombard |
| Physop plan for Friday, May 25, 2007 MP#475 Cryopump Startup Session leader: B. Labombard Physics operator: I. Hutchinson We will start cooling down the cryopump to LN2 and LHe temperatures at 7:00AM. By 8:00AM we will begin some pumping and regeneration cycles. This will involve running some no-power C-Mod shot cycles, puffing D2 into the vessel via the NINJA system and operating with gatevalves closed. If things go well, we will be ready to operate the pump with plasma at around 9:00 AM. Engineering Setup ------------------- Alternator and Machine cooldown for a 9:00AM Start Lockup no earlier than 8:30 AM. Run will end at 5:00PM. No overnight ECDC Power Systems as on 1070511001 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 DISABLED (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) NINJA backfill with 25 PSI of D2. Enable the following gate valves and shutters, assuming no vacuum problems: ECE, VUV, Z-bolo shutters; Enable DNB gatevalve when requested by DNB operator. Torvac setup: Pumpstack gatevalves CLOSED in PULSE (close time tbd) ICRF: not required LH: not required Physop plan: ------------ No-power C-Mod shot cycles will be taken prior to 9:00AM to perform pumping speed benchmarks and pumping/regeneration cycle tests. Then, once the pump is deemed ready for plasmas: LSN Discharges: reload 1070511025, turn on seg2 (LSN), set nl04=0.8e20 Run a few shots with the pump 'warm', then cool the pump to helium temperature. May need to adjust pg4 puff for breakdown. We expect little pumping in this configuration, but this needs to be quantified. Demonstrate pumping and regen cycles with plasma. USN Discharges: turn on seg3 (USN), set nl04=0.8e20 This should be maximum pumping configuration. Run a reference shot with pump ""off"". Then cool it down and pump away. |
| Session Leader Summaries |
| Entered: May 29 2007 11:38:07:450AM |
| Author: Brian Labombard |
| Run Summary for 1070525
MP#475 ""Cryopump Startup"" This was a very successful, milestone-crushing run for the Upper Divertor Cryopump. Not only was the pump cooled down to liquid helium temperatures for the first time in C-Mod today, it also cranked out some impressive particle pumping performances. Congratulations to the entire cryopump team for putting together this new density control tool - a nontrivial task representing about 2 years of thankless hard work. We began cooling down the system to LN2 temperatures starting at 7:10 AM. By 7:35 we had attained a TC reading of -173 C on the LN2 exhaust, indicating the the pump was ready for cooldown to liquid helium temperatures. During cooldown, we attempted to keep temperature differences between the LN2 and LHe circuits minimized by also flowing some LHe. However, temperature differences momentarily exceeded 150 C. Such differences proved to be very difficult (if not impossible) to avoid. After LN2 cooldown, the first cool-down to LHe was started at 7:55AM and by 7:58AM we recorded our first reading of liquid helium on the superconducting ""dip-stick"", exceeding a 36% level. As a result of the cryopump, the torus base pressure dropped by an order of magnitude, starting at 9.8e-8 torr and threatening to dip down onto the -9 scale at 1.0e-8 torr. The first experiment was pumping speed benchmarks in D2 gas. No-power shots 1-3 were dedicated to this. A steady flow of 35 torr-l/s D2 gas was injected through the NINJA capillary, ABLim. Steady torus chamber pressures of 3.3 mtorr were recorded (shot 2) indicating a system pumping speed of 10,600 liters D2 per second. This value exceeds the pumping speed benchmark of 9,700 liters per second obtained last September with the full-scale prototype cryopump in the test chamber. This was the first great news - the C-Mod pump had clearly demonstrated excellent pumping performance for room temperature gas, at or exceeding the expected level. After a standard LSN discharge was obtained without pumping (shot 6), the pump was turned on (i.e., cooled to LHe temperatures) for shot 8. In order to compensate for the cryopump, Ian extended the prefill gas puff duration by about a factor of 2 (36ms instead of 20ms). The LSN shot ran fine with the cryopump cold. However, as expected, there was essentially no particle pumping observed by the system; the LSN topology produces very low neutral pressures in the upper divertor chamber. We then turned our attention to USN plasmas, which should exhibit strong particle removal. First we ran shot 13, a standard USN 'baseline' plasma (NL04 ~ 0.85e20) with no pumping. 20 mtorr was observed in the upper divertor. 30 torr-liters of D2 were injected to fuel this discharge. Then we ran the same shot with the pump on (shot 14). By gas feedback, the plasma density was maintained flat at NL04 ~ 0.8 until 1 s (drooping afterwards), but now the upper divertor pressure was only 2.5 mtorr and 69 torr-liters of D2 were need to fuel this discharge. Based on the gas fueling rate, the cryopumping throughput was estimated to be about 50 torr-liters/s - not too shabby. Thinking that lower density plasmas would be more difficult for the pump to remove particles, we started probing such conditions. First we programmed a repeat of shot 14, (shot 15) but with the gas puff turned off at 0.5 seconds. As expected, the plasma density 'pumped out' dropping from NL04 ~ 0.75 to NL04 ~ 0.4 in 1 second. The effect was reproduced on a repeat shot (shot 16). To explore what happens at even lower densities, we ran a shot with NL04 ~ 0.5 target, also turning off the gas at 0.5 s. The cryopump has able to reduce NL04 from 0.48 to 0.3 in 1 second. At these densities the upper divertor pressure was very low: 0.3 mtorr dropping down to 0.1 mtorr - not much neutral density for the pump to chew on. The most dramatic results of the run came when we explored pumping throughputs for higher density USN plasmas. Shot 24 was run with a density program of NL04 ~ 1.0. At this density, the piezo valve had trouble competing with the cryopump. The resultant density was NL04 ~ 0.9 with the piezo nearly full on. Then we ran shot 26, which became one of the 'trophy shots' for this run. The NINJA system was set up to provide a gas-puff 'assist' for the piezo valve, at an input rate of about 50 torr-liter/s. The resulting shot displayed a remarkably flat density trace with NL04 ~ 0.94 - a true example of density control. Based on the gas injection rates, the cryopump gas throughput was estimated to be 140 torr-liters/s - very impressive indeed. The final topic that we touched on today was gas throughput and density control in lower x-point dominant, double-null plasmas. Here we were looking to set up some good L-mode target plasmas for H-mode pumpout studies (to be performed later). Shots 29, 30 and 31 are a series of near DN plasmas (NL04 ~ 1.0) with SSEP ~ 0, -3 and -6 mm. Despite the different SSEP values, all three plasmas exhibited excellent pumping throughputs, exceeding 70 torr-liters/s. Pressures in the upper chamber exceeded 3 mtorr with the pump on. These results are very encouraging and suggest that the upper chamber tile geometry and baffling structures are working more or less according to plan. We will need to investigate the pumping performance and throughputs in lower density plasmas and also in plasmas with higher currents. These tend to have less pronounced 'shoulders' in the SOL density profile and therefore may be more sensitive to the SSEP values. |
| Physics Operator Summaries |
| Entered: May 25 2007 05:09:28:573PM |
| Author: Ian Hutchinson |
| A fairly tough day for physop. Several power supply problems with OH1 and EF1
which appeared to semi-cure themselves. These were a source of fizzles. Also the plasmas from which we started have a major problem that EF2u zeros itself at around .3s leading to VDEs in some cases. A fix for this is to reduce the EF4 current demanded, maybe even to a negative value. But this was not fully implemented during the shots we had. Scorecard __________
Shot,Duration(s),Ipmax(MA),Result Shot,Duration(s),Ipmax,Result
| 01 0.000 0.002 Dud | 02 0.000 0.002 Dud |
| 03 0.000 0.002 Dud | 04 0.000 0.028 Fizzle |
| 05 0.000 0.030 Fizzle | 06 1.958 0.810 Plasma |
| 07 0.000 0.002 Dud | 08 1.959 0.811 Plasma |
| 09 0.000 0.031 Fizzle | 10 0.000 0.031 Fizzle |
| 11 0.000 0.032 Fizzle | 12 0.429 0.809 Plasma |
| 13 1.953 0.824 Plasma | 14 1.959 0.822 Plasma |
| 15 1.960 0.818 Plasma | 16 1.958 0.817 Plasma |
| 17 0.258 0.764 Plasma | 18 1.955 0.813 Plasma |
| 19 1.959 0.829 Plasma | 20 0.000 0.056 Dud |
| 21 1.959 0.815 Plasma | 22 0.000 0.058 Fizzle |
| 23 0.371 0.797 Plasma | 24 1.959 0.814 Plasma |
| 25 0.151 0.647 Plasma | 26 1.956 0.812 Plasma |
| 27 1.954 0.837 Plasma | 28 1.968 0.826 Plasma |
| 29 1.958 0.831 Plasma | 30 1.955 0.828 Plasma |
| 31 1.956 0.822 Plasma
Date 1070525: 31 shots. 20 plasmas. 6 fizzles. 5 duds. 0 System Error.
(Plasma = Ip gt 60.0 kA Dud = H_alpha lt 0.40 V)
Total plasma duration: 32.54 s (exceeding -100 kA)
|
| Session Leader Comments | |||
| May 25 2007 09:33:32:163AM | 1070525001 | Brian Labombard | 1 - Baseline no-power shot with NINJA puff - ABLim capillary, trig: 0.0, duration 1.0, 1148 torr LN2 cold, LHe cold, 89% on dip-stick gatevalves closed for 3? minutes after shot got about 3 mtorr in the vessel with a gas input rate of 36 torr-l/s => 10,000 l/s D2 pumping speed gatevalves opened too soon - truncating the regen cycle Next: repeat with 5s NINJA and gate valves closed for 10 minutes |
| May 25 2007 09:53:03:340AM | 1070525002 | Brian Labombard | 2 - Baseline no-power shot with NINJA puff - ABLim capillary, trig: 0.0, duration 5.0, 1140 torr LN2 cold, LHe cold, 90% on dip-stick 3.3 mtorr in vessel. Gas injection rate is 33 torr-l/s => 10,000 torr-l/s Next: repeat with Helium warm, 2s NINJA puff and gate valves closed for 3 minutes |
| May 25 2007 10:03:43:987AM | 1070525003 | Brian Labombard | 3 - Baseline no-power shot with NINJA puff - ABLim capillary, trig: 0.0, duration 2.0, 1110 torr D2 LN2 cold, LHe WARM, gatevalves closed for 3 minutes after shot NINJA puff rate is verified to be 35 torr-liters/s Next: Go for LSN plasma with pump off (helium circuit WARM) |
| May 25 2007 10:47:28:160AM | 1070525006 | Brian Labombard | 6 - LSN, Ip=0.8, NL04=0.75, Bt=5.47 Cryopump warm, 41 torr-liters injected, 8 torr-liters in chamber after shot NINJA puff rate is verified to be 35 torr-liters/s Next: Go for LSN plasma with pump off (helium circuit WARM) |
| May 25 2007 11:02:28:523AM | 1070525007 | Brian Labombard | 7 - No power shot with Cryopump COLD. This will help us assess the impact of the pump on the pre-puff |
| May 25 2007 11:16:19:250AM | 1070525008 | Brian Labombard | 8 - LSN, Ip=0.8, NL04=0.81, Bt=5.47 Cryopump COLD, 31 torr-liters injected Next: Go for USN plasma with pump off (helium circuit WARM) |
| May 25 2007 12:34:00:153PM | 1070525013 | Brian Labombard | 13 - USN, Ip=0.8, NL04=0.85, Bt=5.47 Cryopump WARM, 30 torr-liters injected, 7 torr-liters in torus after shot Next: repeat USN plasma with pump on |
| May 25 2007 12:54:02:333PM | 1070525014 | Brian Labombard | 14 - USN, Ip=0.8, NL04=0.8, dropping after 1.1s, Bt=5.47 Cryopump COLD, 69 torr-liters injected, 2.5 mtorr at pump entrance 52 torr-liters recovered during regen. Crypumping throughput is 50 torr-liters/s Next: Repeat, with gas input shutoff at 0.5 s |
| May 25 2007 01:07:00:277PM | 1070525015 | Brian Labombard | 15 - USN, Ip=0.8, NL04=0.78 dropping to 0.4 in about 1 sec, Bt=5.47 Cryopump COLD, 32 torr-liters injected, 2.5 mtorr down to 0.2 mtorr at pump entrance 25 torr-liters recovered during regen. Next: Repeat |
| May 25 2007 01:20:17:437PM | 1070525016 | Brian Labombard | 16 - USN, Ip=0.8, NL04=0.76 dropping to 0.4 in about 1 sec, Bt=5.47 gas puff programmed to zero at 0.5 sec Cryopump COLD, 38 torr-liters injected, 2.5 mtorr down to 0.25 mtorr at pump entrance 26 torr-liters recovered during regen. Next: Repeat with cryopump warm |
| May 25 2007 01:27:59:003PM | 1070525017 | Brian Labombard | 17 - Early disruption |
| May 25 2007 01:53:12:183PM | 1070525018 | Brian Labombard | 18 - USN, Ip=0.8, NL04=0.86 dropping to 0.72 in about 1 sec, Bt=5.47 gas puff programmed to zero at 0.5 sec Cryopump WARM, 27 torr-liters injected, 22 mtorr down to 9 mtorr at pump entrance 9 torr-liters recovered during regen. Next: Repeat with cryopump COLD and NL04=0.4, puff off at 0.5s |
| May 25 2007 02:05:29:127PM | 1070525019 | Brian Labombard | 19 - USN, Ip=0.8, NL04=0.48 dropping to 0.3 in about 1 sec, Bt=5.47 gas puff programmed to zero at 0.5 sec Cryopump COLD, 5 torr-liters injected, 0.3 mtorr down to 0.1 mtorr (Penning) at pump entrance 9 torr-liters recovered during regen. Next: Repeat with cryopump COLD and flat program of NL04=1.0 |
| May 25 2007 02:35:49:607PM | 1070525021 | Brian Labombard | 21 - USN, Ip=0.8, NL04=0.86 dropping to 0.46 in about 0.7 sec, Bt=5.47 gas puff programmed to zero at 0.75 sec Cryopump COLD, 73 torr-liters injected, 4 mtorr peak pressure at pump entrance 45 torr-liters recovered during regen. Next: Repeat with cryopump COLD and flat program of NL04=1.0 |
| May 25 2007 03:00:26:163PM | 1070525023 | Brian Labombard | 23 - Early disruption. |
| May 25 2007 03:24:16:970PM | 1070525024 | Brian Labombard | 24 - USN, Ip=0.8, NL04=0.9 to 1.05 s, dropping to 0.73, Bt=5.47 120 torr-l/sec pumping, Cryopump COLD, 122 torr-liters injected, 5 mtorr peak pressure at pump entrance 89 torr-liters recovered during regen. Next: Repeat with cryopump COLD, flat program of NL04=1.0, NINJA puff assist of 36 torr-l/s starting at 0.5 s for duration of 1s. Also enable argon puff. |
| May 25 2007 03:28:53:830PM | 1070525025 | Brian Labombard | 25 - Early disruption. |
| May 25 2007 03:56:46:170PM | 1070525026 | Brian Labombard | 26 - USN, Ip=0.8, Very flat NL04=0.94, Bt=5.47 NINJA D2 at 1370 torr, trig: 0.3 duration: 1.0 Ninja puffs 50 torr-l/s 140 torr-l/sec pumping, Cryopump COLD, 183 torr-liters injected, 5 mtorr peak pressure at pump entrance 89 torr-liters recovered during regen. Next: go to Double Null, cryopump COLD, flat program of NL04=1.0, NINJA puff assist of 50 torr-l/s starting at 0.5 s for duration of 1s. Argon enabled. |
| May 25 2007 04:08:34:017PM | 1070525027 | Brian Labombard | 27 - DN, SSEP close to 0, Ip=0.8, NL04=1.0 dropping to 0.96, Bt=5.47 NINJA D2 at 1351 torr, trig: 0.3 duration: 1.0 Ninja puffs 50 torr-l/s ~50 torr-l/sec pumping, Cryopump COLD, 103 torr-liters injected, 4 mtorr peak pressure at pump entrance 83 torr-liters recovered during regen. Next: Repeat, cryopump COLD, flat program of NL04=1.0, NINJA puff off Argon enabled. |
| May 25 2007 04:26:00:227PM | 1070525028 | Brian Labombard | 28 - DN, SSEP close to 0, Ip=0.8, NL04=1.0 dropping to 0.8, Bt=5.47 ~30 torr-l/sec pumping, Cryopump COLD, 74 torr-liters injected, 2.5 mtorr peak pressure at pump entrance 55 torr-liters recovered during regen. Next: Repeat |
| May 25 2007 04:37:48:427PM | 1070525029 | Brian Labombard | 29 - DN, SSEP close to 0, Ip=0.8, Very flat NL04=1.0, Bt=5.47 72 torr-l/sec pumping, Cryopump COLD, 111 torr-liters injected, 3.3 mtorr peak pressure at pump entrance 80 torr-liters recovered during regen. Next: Repeat with SSEP = -3 mm |
| May 25 2007 04:57:54:287PM | 1070525030 | Brian Labombard | 30 - LSN, SSEP = ~-3mm drifting to 0, Ip=0.8, Very flat NL04=1.0, Bt=5.47 80 torr-l/sec pumping, Cryopump COLD, 114 torr-liters injected, 4 mtorr peak pressure at pump entrance 85 torr-liters recovered during regen. Next: Repeat with SSEP = -6 mm |
| May 25 2007 05:53:39:213PM | 1070525031 | Brian Labombard | 31 - LSN, SSEP = ~-6mm drifting to -3mm, Ip=0.8, Very flat NL04=1.0, Bt=5.38 70 torr-l/sec pumping, Cryopump COLD, 109 torr-liters injected, 3.2 mtorr peak pressure at pump entrance 80 torr-liters recovered during regen. |
| Physics Operator Comments | |||
| May 25 2007 09:55:34:093AM | Ian Hutchinson | Load from 1070511025.
Call ZXU controller to update for broken loop. Br offset to -0.003 from .0033. NL04 to .8e20 in segment 2. Load. Check segment 3 controllers. Set NL04 to .8e20 in segment 3. Load | |
| May 25 2007 09:55:54:920AM | 1070525003 | Ian Hutchinson | Shots 1-3 are gas only cycles. |
| May 25 2007 10:20:00:150AM | 1070525004 | Ian Hutchinson | Fizzle. Magnetics show a substantial difference between f09 and f19.
But it is hard to be sure that we know what we are doing with flux loops bad. Raise fill puff to 20ms from 16ms. |
| May 25 2007 10:34:27:653AM | 1070525005 | Ian Hutchinson | Fizzle.
B_r offset to -.0033 from -.003 Rcur offset to 1000 from 1300. Load. |
| May 25 2007 10:51:20:443AM | 1070525006 | Ian Hutchinson | Plasma.
Next shot is to be pump. Fill puff to 40ms to compensate. Take no power shot. |
| May 25 2007 11:09:04:090AM | 1070525007 | Ian Hutchinson | Gas only shot. Shows that 40ms is a bit too much
Gas fill to 36ms. Load. |
| May 25 2007 11:23:05:033AM | 1070525008 | Ian Hutchinson | Plasma. Satisfactory shot.
Switch off segment 2 switch on segment 3. Fill puff to 20ms in preparation for no pumping upper null. load. |
| May 25 2007 11:35:05:930AM | 1070525009 | Ian Hutchinson | Fizzle. Very weak current. Slightly high initial pressure caused by high
base pressure. Rcur offset to 800. EF4 Voltage to 2600 from 2800. load. |
| May 25 2007 11:47:14:230AM | 1070525010 | Ian Hutchinson | Fizzle. Very late breakdown caused by OH1 current error. The power supply is
misbehaving as yesterday (suddenly). ICOH1 integral gain to 4. It is integrating only for the period -.1 to 0s. |
| May 25 2007 11:56:17:937AM | 1070525011 | Ian Hutchinson | Fizzle. Breakdown time is OK and OH1 current is much better.
We observe, however, that the problem at breakdown appears in fact to be with the EF1U power supply, which suddenly started giving a voltage that is half of its demand on shot 10 (and 11). Br offset to -.003 from -.0033. Fill puff to 18ms. |
| May 25 2007 12:25:34:103PM | 1070525012 | Ian Hutchinson | Plasma. Disrupts at 0.4 because of VDE.
Ef2byEF4 gain brought up at 2.1s to 0.5 to try to prevent the EF2 lurch. Clearin gain at .236 lowered to 5 from 7. load. |
| May 25 2007 12:39:44:983PM | 1070525013 | Ian Hutchinson | Plasma.
Fix the A-coil programming for integral gain control at .2s not preprogrammed. Program clearin to be zero at .23s instead of -.01. Load. |
| May 25 2007 12:55:48:787PM | 1070525014 | Ian Hutchinson | Plasma. Quite strong pumping.
NL04 to zero at 0.5s, also remove preprogrammed puff. |
| May 25 2007 01:05:50:557PM | 1070525015 | Ian Hutchinson | Plasma. Good pumpout. |
| May 25 2007 01:27:38:110PM | 1070525016 | Ian Hutchinson | Plasma. Good repeat, but a bounce on startup.
IC_EF4 to -1325A from -1335. Fill puff to 18ms. |
| May 25 2007 02:02:12:017PM | 1070525018 | Ian Hutchinson | Plasma.
Lower ZXU gains during the bad time .2-.35s to try to prevent EF2 railing. NL04 to .4e20 turning off at .5s. |
| May 25 2007 02:09:31:673PM | 1070525019 | Ian Hutchinson | Plasma.
EF1 step at .2s increased from 150V to 200V. NL04 to 1e20 constant. |
| May 25 2007 02:21:57:930PM | 1070525020 | Ian Hutchinson | Fizzle. Late breakdown. Fill pressure very low. Did not increase it.
Fill puff to 36ms. |
| May 25 2007 02:39:49:763PM | 1070525021 | Ian Hutchinson | Plasma
Restore nl04 gain erroneously omitted after 0.7s. |
| May 25 2007 03:08:21:010PM | 1070525022 | Ian Hutchinson | Fizzle.
EF4 to -1315 from -1325A |
| May 25 2007 03:20:01:450PM | 1070525023 | Ian Hutchinson | Plasma disrupts owing to EF2U zeroing.
Delay the RXU ramp so that it reaches -0.02 at .5s. |
| May 25 2007 03:29:11:003PM | 1070525024 | Ian Hutchinson | Plasma. Full out gas puff is pumped out.
IC_EF4 demand dropped to 1300A at .2s on. Enable Argon. Increase nl04 preprogram after 1s |
| May 25 2007 03:49:31:930PM | 1070525025 | Ian Hutchinson | Plasma disrupts at .15s owing to vertical instability from the start.
Possibly induced by pause associated with bounce. Rcur ofset to 1000 from 800. |
| May 25 2007 04:01:26:920PM | 1070525026 | Ian Hutchinson | Plasma. Density well controlled.
Move to double null and related variations. Switch off segment 3. Switch on segment 4. Set SSEP to zero. Import B21_proj onto wire 9. NL04 to 1e20 Load. |
| May 25 2007 04:11:36:173PM | 1070525027 | Ian Hutchinson | Plasma. Satisfactory but EF2u rails for most of the shot.
IC_EF4 to 1300 from 2000A seg 4. Set Acoil current demand to zero Move c-integrator time to .2. |
| May 25 2007 04:28:30:947PM | 1070525028 | Ian Hutchinson | Plasma
EF4C to 500A? Oops. Did segment 3 by mistake. |
| May 25 2007 04:46:57:880PM | 1070525028 | Ian Hutchinson | Plasma
EF4C to 500A? Oops. Did segment 3 by mistake. |
| May 25 2007 04:46:59:723PM | 1070525028 | Ian Hutchinson | Plasma
EF4C to 500A? Oops. Did segment 3 by mistake. |
| May 25 2007 04:46:51:177PM | 1070525029 | Ian Hutchinson | Plasma.
ICEF4 to 500A (really) SSEP to -.003 Intermediate gain step in EF2byEF4 |
| May 25 2007 05:03:09:150PM | 1070525030 | Ian Hutchinson | Plasma.
SSEP to -.006 Lower EF4 again. Move EF2byEF4 control earlier. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:17:44:563AM | Test | Ok | |
| 2 | 09:34:17:053AM | Test | Ok | |
| 3 | 09:52:47:140AM | Test | Ok | |
| 4 | 10:05:59:643AM | Plasma | Ok | |
| 5 | 10:20:04:413AM | Plasma | Ok | |
| 6 | 10:32:45:623AM | Plasma | Ok | |
| 7 | 10:49:31:130AM | Test | Ok | |
| 8 | 11:01:55:667AM | Plasma | Ok | |
| 9 | 11:15:04:687AM | Plasma | Ok | |
| 10 | 11:27:50:987AM | Plasma | Ok | |
| 11 | 11:40:15:930AM | Plasma | Ok | |
| 12 | 11:54:35:310AM | Plasma | Bad | OH2 Comm Fault OH1 Self Powered |
| 13 | 12:24:02:400PM | Plasma | Ok | |
| 14 | 12:37:59:157PM | Plasma | Ok | |
| 15 | 12:53:02:850PM | Plasma | Ok | |
| 16 | 01:05:57:087PM | Plasma | Ok | |
| 17 | 01:20:49:810PM | Plasma | Ok | |
| 18 | 01:36:05:803PM | Plasma | Ok | |
| 19 | 01:52:21:823PM | Plasma | Ok | |
| 20 | 02:06:11:940PM | Plasma | Ok | |
| 21 | 02:23:16:150PM | Plasma | Ok | |
| 22 | 02:35:44:200PM | Plasma | Ok | |
| 23 | 02:54:37:240PM | Plasma | Ok | |
| 24 | 03:09:08:010PM | Plasma | Ok | |
| 25 | 03:22:54:670PM | Plasma | Ok | |
| 26 | 03:39:11:163PM | Plasma | Ok | |
| 27 | 03:53:33:543PM | Plasma | Ok | |
| 28 | 04:06:49:140PM | Plasma | Ok | |
| 29 | 04:24:10:150PM | Plasma | Ok | |
| 30 | 04:37:12:523PM | Plasma | Ok | |
| 31 | 04:56:45:897PM | Plasma | Ok | |
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| May 25 2007 08:11:41:380AM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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