| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | John Walk |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Gary Dekow,Bill Byford,Roza Tesfaye |
| Engineering Operator Run Comment |
| MP707 - Pedestal and heatflux-width scaling studies in I-mode plasmas |
| Session Leader Plans |
| Entered: Aug 23 2012 04:51:25:340PM |
| Author: John Walk |
| Pedestal and heat-flux width scaling studies in I-mode plasmas
This will be the first of two run days, examining the scaling of the pedestal and scrape-off layer heat flux with density, plasma current, and ICRF heating power. We will operate in lower single null with reversed field and current (thus with unfavorable ion grad-B drift) - this will allow steady I-mode access using the lower divertor, with shaping optimized for pedestal diagnostic coverage. This experiment will have two goals: (a) pedestal structure and scaling across a broad range in plasma current (700-1300kA) and RF power (3-5MW) at several density values, leading to empirical scaling relations and ultimately turbulence and stability analyses of the I-mode pedestal (b) scaling of SOL heat flux width at the lower divertor with plasma current and heating power (J. Terry) We will be holding the shaping as consistent as possible across the run day to isolate pedestal dependences on the three parameters of interest, with some field variation ~0.1T to shift ECE channel positions. General Parameters: toroidal field: 5.5T plasma current: 700-1300kA (steady in individual shots) working gas: D2 ICRF: 3-5MW LBO: injecting Calcium Gas puffing: D2 through NINJA for CXRS Ar for HiReX SR He for GPI Ne seeding available Diagnostics: core and edge Thomson Scattering CXRS with D2 puffing LBO with Calcium IR thermography inner and outer thermocouples HiReX SR in, high-Te configuration (M.L. Reinke) ECE (GPC, GPC2, FRC) CECE O-mode reflectometer Shot Plan: Start from reference shot 1120822018, change Bt to 5.5T, maintain shaping throughout (no strikepoint sweep). We will start with the 1000kA shot (as with 1120822018) to shoot for unambiguous I-modes to start. This experiment will consist of three sets of ten shots each. The blocks of ten shots will each be at fixed Greenwald fractions of f_Gr = 0.2, 0.3, 0.4 across a current scan. For successful shots, we will repeat the shot, swapping out D2 puffing for CXRS in favor of He puffing for GPI. These repeated shots will be held at the most favorable RF level from the corresponding stairstep, again at the SOL team's discretion. (0.) Locked-mode shots for HiReX. We will take several shots in phase (1) first to establish the helium atmosphere in HiReX, then take up to three locked-mode calibration shots. First locked-mode will be standard at 800kA, with an optional second shot at 1MA. We will hold a third shot available to reattempt the 1MA shot if necessary to scale up the density, before returning to phase (1). (1.) f_Gr = 0.2, ten shots + ~4 shots dependent on SOL team request two shots at 700kA: nl04 of 0.51. i) ICRF at 4MW starting at 0.5s, stairstep in 200ms intervals by 250kW down to 3MW, finishing at 1.5s - 4MW at 0.5s, 3.75MW at 0.7s, 3.5MW at 0.9s, 3.25MW at 1.1s, 3MW at 1.3s. ii) ICRF at 4MW starting at 0.5s, stairstep up in 200ms intervals by 250kW up to 5MW, finishing at 1.5s - 4MW at 0.5s, 4.25MW at 0.7, 4.5MW at 0.9s, 4.75MW at 1.1s, 5MW at 1.3s. two shots at 850kA: nl04 of 0.62. Identical RF heating pattern to 700kA shots. two shots at 1000kA: nl04 of 0.73. Identical RF heating pattern to 700kA shots. two shots at 1150kA: nl04 of 0.84. Identical RF heating pattern to 700kA shots. two shots at 1300kA: nl04 of 0.95. Identical RF heating pattern to 700kA shots. (2.) f_Gr = 0.3, ten shots + ~5 shots dependent on SOL team request I anticipate that the first run day will end partially through block 2. The second run day will continue where we leave off. two shots at 700kA: nl04 of 0.77. Identical RF heating pattern. two shots at 850kA: nl04 of 0.93. Identical RF heating pattern. two shots at 1000kA: nl04 of 1.09. Identical RF heating pattern. two shots at 1150kA: nl04 of 1.26. Identical RF heating pattern. two shots at 1300kA: nl04 of 1.42. Identical RF heating pattern. The third Greenwald fraction step will be held for the second run day. We anticipate that I-mode access will be difficult at the high and low ends of this density/current sweep; the goal is to achieve a scan across as broad an accessible range as possible. |
| Physics Operators Plans |
| Entered: Aug 23 2012 05:01:47:180PM |
| Author: Robert Granetz |
Engineering setup for Friday 2012/08/24
MP707 - Pedestal and heatflux-width scaling studies in I-mode plasmas
Session leader: J. Walk
Physics operator: R. Granetz
ECDC in ** HELIUM ** overnight
Power systems as on: 1120822019 (rev B, 5.4 T, 1.0 MA, 0.7e20 m-2, LSN)
A-coil configuration: -Dtop +Dbot +Jtop -Jbot; Hybrid enabled (reversed
field configuration)
Gas Setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 2 psi Ne Hybrid DISABLED (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3)
fill H-bottom with 1 psi Ar Hybrid DISABLED (PG5)
leave B-div as is Hybrid DISABLED (PG6)
leave H-div as is Hybrid DISABLED (PG7)
fill NINJA F-port with 10 psi D2 DISABLED
fill NINJA C-port with 10 psi He DISABLED
Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo, HIREX-Sr, Xeus, LoWEUS
Torvac setup: keep gate valves open during pulse
Required systems: ICRF (up to 5 MW)
Required diagnostics: CXRS, GPI, LBO w/CaF2, IR thermography & TC's,
HIREX-SR, TS, ECE, reflectometry
Desired diagnostics: DNB, CECE, HIREX-JR
------------------------------------------------------------------------------
Boronization overnight: no
ICRF: yes, up to 5 MW
LH: no
Impurity injector: yes, w/CaF2
DNB: desirable
Cryopump: no
------------------------------------------------------------------------------
Run plan: start from 1120822019, but with Bt=5.5 T and nl_04=0.73e20 m-2,
and no sweep of RXL. Density and plasma current will be varied. See
SL plan for more details. At some point there will be a locked mode
calibration shot (1110317006, updated).
|
| Entered: Aug 23 2012 05:08:30:293PM |
| Author: Robert Granetz |
Load entire shot from 1120820025 (non-cryopump rev B startup & plasma) Load seg 2 from seg 3 of 1120822019 (1 MA LSN I-mode with rev B) - change Btor to 5.5 T (152800 A) - change nl_04 to 0.73e20 m-2 - remove RXL sweep (fix at the value at t=0.5 s) Load seg 4 from seg 3 of 1110317006 (locked mode shot in rev B) - reCALL all magnetics-based estimators and B21_PROJ ENGOPS setups: - enable H-bottom (1 psi argon) - disable B-side-lower (2 psi neon) |
| Session Leader Summaries |
| Entered: Aug 24 2012 06:17:06:953PM |
| Author: John Walk |
| Pedestal and heat-flux width scaling studies in I-mode plasmas
Scorecard - 27 shots: 2 VDE for bad EFC 1 power test after fixing EFC 4 fizzle 3 locked mode (2 intentional) 4 early disruptions 4 disruptions during RF (0.5-1.5sec) 9 full-length/disruption after RF Of the in-RF disruptions, all four had I-modes prior to disrupting. Of the full plasmas, two did not achieve I-modes (with a third ambiguous). Four were mixed I- and H-mode, with the rest in I-mode. The run day got off to a badly delayed start - a frozen valve on an LN2 line delayed cell closure until 11AM, while power supply problems on delayed the first successful plasma to nearly noon. After we were able to run, we achieved several good I-modes, although we were plagued by injections and disruptions for many of the shots. Part of this was due to the plan for the RF heating, in which the ICRF would start at 4MW then step up to 5 or down to 3MW on alternating shots. The idea was to immediately kick the plasma into a hot I-mode, but this caused more problems than it solved; the 4MW phases were subject to repeated tungsten injections due to contact with divertor probes. Although the I-mode recovered nicely, this left much of the higher RF power stages without good pedestals. This was largely ameliorated by switching out the RF power step in favor of a step from 3-5MW in at 200ms in 500kW stages (rather than the 250kW stages initially proposed). Although the plasma would generally not reach an unambiguous I-mode until the later stages in the RF step (3.5-4MW) this avoided the injections. Today's run largely focused on the low-density sweep, targeting a Greenwald fraction of 0.2 across the current scan. Broad coverage in I-mode across the RF power scan was achieved at 1000kA and 1300kA, with the 1MA shot usually mixed in I- and H-mode (and suffering from tungsten injections due to my RF plan). The 1.3MA shots were our most successful of the day, with clear Te pedestals throughout the RF trace and strong turbulence suppression visible on the reflectometer. Shots at f_Gr = 0.2 at 700kA were also attempted, but did not achieve I-mode (this represents the lowest point in the density scan for this experiment). High power caused serious heat loading on the walls, including a sizeable injection from the shoelace antenna. As a result, we backed off of the low density, attempting 700kA at f_Gr = 0.3 for the middle density setting, then coming up to 850kA at f_Gr = 0.3. The 850kA attempts were again plagued by disruptions (for ambiguous reasons), finally getting a full-length plasma on the last shot (albeit unclear whether it achieved I-mode). All in all, we have data in the low-density sweep at 1000 and 1300kA, and (some) data in the middle density sweep at 850kA. We will pick up where we left off today in next tuesday's run, and begin by filling in higher-current points in the middle density sweep. |
| Physics Operator Summaries |
| Entered: Aug 24 2012 05:04:10:163PM |
| Author: Robert Granetz |
Run summary for Friday 2012/08/24
MP707 - Pedestal and heat flux width scaling studies in I-mode plasmas
Session leader: J. Walk
Physics operator: R. Granetz
The goals of today's run were to have steady I-modes at several different
currents (0.7 to 1.3 MA), and several different densities. The plasmas
were all LSN in reversed field. We got off to a very late start, initially
because of problems with a cryogenic valve on one of the PF coil LN2 lines,
and then on a problem with the TMX supplies that provide DC voltage to the
EFC chopper supply. We finally got going with I-mode plasmas around
11:00. We got plasmas with good ICRF heating at 0.7, 0.85, 1.0, and 1.3
MA, and a number of different densities. Many of these had very good,
steady, hot I-modes. But we were plagued by disruptions throughout the
day, presumably due to the high RF power. I-modes were best at the higher
currents. We will continue this run on Tuesday. Note that before this
run, we did ECDC in helium, and this, combined with the disruptions, kept
the density under control today, unlike earlier this week.
Scorecard: 22 plasmas
1 dud (no EF3)
3 fizzles
1 power supply test
0 no-power MDSplus cycle tests
0 no-power gas test
--------------
Total: 27 shot cycles
|
| Session Leader Comments | |||
| Aug 24 2012 10:53:56:193AM | 1120824001 | John Walk | shot 1:
attempt: Ip = 1000kA, f_Gr = 0.2 -> nl04 of 0.73, RF stairstep. No NINJA this shot just to see if we can start up ok. result: Iron injection? disrupts 0.5sec. next: repeat attempt. |
| Aug 24 2012 11:09:37:830AM | 1120824002 | John Walk | shot 002
attempt: repeat 001, Ip = 1MA, nl04 = 0.73, this time fire NINJA and Ar. result: another vertical disruption, sounds like trouble with EFC. next: try again. |
| Aug 24 2012 11:39:02:990AM | 1120824003 | John Walk | shot 003:
attempt: power supply test. next: re-attempt 1000kA shot. |
| Aug 24 2012 11:44:54:353AM | 1120824004 | John Walk | shot 004.
attempt: re-attempt 1MA shot. result: no plasma. next: try again. |
| Aug 24 2012 12:12:25:957PM | 1120824005 | John Walk | shot 005
attempt: repeat 1MA shot result: two ELM-free H-modes at 0.85 and 1.05sec, RF cuts out during these. May be I-mode outside these phases. Some RF trouble as well, we'll try again. next: repeat, increase Ar puff. |
| Aug 24 2012 12:26:57:013PM | 1120824006 | John Walk | shot 006
attempt: repeat 1MA shot. result: H-mode at 0.8-1.0sec, disrupts at 1.45sec. Looks like I-mode 0.5-0.8sec or so. |
| Aug 24 2012 12:40:39:943PM | 1120824007 | John Walk | shot 007
attempt: repeat 1MA. result: H-mode at 0.9sec, disrupts after. Small I-mode in first RF step. next: repeat. |
| Aug 24 2012 12:51:23:707PM | 1120824008 | John Walk | shot 008
attempt: repeat 1MA shot with longer Ne seeding. result: H-mode, then locked mode |
| Aug 24 2012 01:09:24:980PM | 1120824009 | John Walk | shot 009:
attempt 1MA, RF step down. result: disrupts at 1.2sec, Mo injection. Plasma looks good before then though, RF step is dialed in nicely. |
| Aug 24 2012 01:12:32:707PM | 1120824010 | John Walk | shot 010
attempt: repeat 1MA RF step down, shifted Ne puff earlier. result: fizzle. Disruptions catch up with you eventually. |
| Aug 24 2012 01:32:25:060PM | 1120824011 | John Walk | shot 011
attempt: 1MA, RF step down. result: full-length plasma, no RF faults. Edge Te drops with repeated W injections (melted probe?) from 0.5-0.9sec, looks good after 1.0sec. |
| Aug 24 2012 01:39:06:977PM | 1120824012 | John Walk | shot 012
attempt: 1MA RF step down result: disrupts at 0.6sec |
| Aug 24 2012 01:54:42:363PM | 1120824012 | John Walk | shot 012
early disruption, possible Mo injection. |
| Aug 24 2012 01:55:50:390PM | 1120824013 | John Walk | shot 013
fizzle. |
| Aug 24 2012 02:15:18:767PM | 1120824014 | John Walk | shot 014
disrupts after 1.5sec. smaller injections from 0.5-0.9sec, edge Te cleans up after 1.0sec. next: we're going to try changing up the RF plan for this shot - start at 3MW, step up in 500kW steps at the same timing up to 5MW. |
| Aug 24 2012 02:43:14:340PM | 1120824015 | John Walk | shot 015
changed up the RF trace, 3-5 MW step in 200ms, 500kW steps. Density ramp cuts off temperature rise after 1.0sec, but before then looks good - fast I-mode transition at 0.8sec. next: go ahead and move up to high current point - 1300kA, nl04 = 0.95. Same 3-5MW RF plan. |
| Aug 24 2012 03:32:08:207PM | 1120824019 | John Walk | shot 019
1.3MA, 3-5MW ICRF results: plasma into rampdown, ICRF faults after 1.2sec, H-mode at 1.2sec, good before 1.0sec. Ne puff was not re-enabled after locked modes. next: repeat with Ne puff enabled |
| Aug 24 2012 04:18:25:513PM | 1120824020 | John Walk | shot 020
disrupts at 1.1sec, hot L-mode before disruption |
| Aug 24 2012 04:19:59:120PM | 1120824021 | John Walk | shot 021
try for 700kA, fGr = 0.2 -> nl04 = 0.5 still with 3-5MW ICRF step disrupts at 0.5sec next: retry |
| Aug 24 2012 04:22:58:880PM | 1120824022 | John Walk | shot 022
retry 021: 700kA, nl04 of 0.5. result: no I-mode, torching the GH limiter. |
| Aug 24 2012 04:27:50:600PM | 1120824023 | John Walk | shot 023
try for Greenwald fraction of 0.3 at low current - 700kA, nl04 = 0.77, 3-5MW ICRF. result: hot edge, but no obvious pickup in edge Te gradient. next: We're not having much luck at this current, so let's try coming up a bit to 850kA. At f_gr of 0.3, that gives nl04 of 0.93. |
| Aug 24 2012 04:36:21:110PM | 1120824024 | John Walk | shot 024
attempt: 850kA, nl04 = 0.93, 3-5MW ICRF. result: disrupts at 0.6sec. next: repeat. |
| Aug 24 2012 04:46:29:627PM | 1120824025 | John Walk | shot 025.
Repeat 850kA, nl04 = 0.93. dud. |
| Aug 24 2012 05:03:24:503PM | 1120824026 | John Walk | shot 026
repeat 850kA attempt. result: disrupts at 0.35sec, not sure why next: once more with feeling |
| Aug 24 2012 05:17:57:153PM | 1120824027 | John Walk | shot 027
attempt: 850kA, 3-5MW ICRF, nl04=0.93 result: plasma into rampdown, but ICRF very faulty after 0.9sec. Maybe some weaker I-modes in earlier RF steps. next: end of run. We'll pick up where we left off next tuesday. |
| Physics Operator Comments | |||
| Aug 24 2012 10:56:23:987AM | 1120824001 | Robert Granetz |
Shot 01 -- Plasma, disrupted at t=0.48 s. VDE (upward). EFC chopper didn't output its usual voltage.
Engineers are checking on the EFC supplies. Startup wasn't so good.
Next shot: increase pre-fill by 3 ms (to 25 ms); set argon puff for t=0.30-0.35 s
|
| Aug 24 2012 11:29:23:493AM | 1120824002 | Robert Granetz |
Shot 02 -- Plasma, disrupted at t=0.46 s, again an upward VDE due to misbehavior by EFC supply.
Startup was much improved.
Engineers are checking TMX DC supply to EFC.
Next shot: PLC controlled test of TMX supplies to EFC chopper
|
| Aug 24 2012 11:36:07:430AM | 1120824003 | Robert Granetz |
Shot 03 -- power-supply test (PLC-controlled test of TMX supplies to the EFC chopper)
Result: finally got the proper DC voltage from each of the TMX supplies. (Gary changed some
chips on the regulator board)
Next shot: try again for steady plasma
|
| Aug 24 2012 11:45:50:390AM | 1120824004 | Robert Granetz |
Shot 04 -- Fizzle. Prefill pressure was noticeably higher than on shot 2, even though I didn't
change it. Maybe it was the two preceding VDEs
Next shot: reduce pre-fill by 1 ms
|
| Aug 24 2012 12:09:19:660PM | 1120824005 | Robert Granetz |
Shot 05 -- Plasma, full length. 1 MA, 5.5 T, 0.7e20 m-2, LSN, rev B, Prf=2-4 MW.
Good strike point locations. Looks like I-mode most of the time.
Good startup.
Next shot: start early ZXL upsweep even earlier, since RF is coming on at t=0.5 s;
increase Ar puff to 75 ms
|
| Aug 24 2012 12:25:18:657PM | 1120824006 | Robert Granetz |
Shot 06 -- Plasma, disrupts at 1.46 s due to an injection.
1 MA, 5.5 T, 0.7e20 m-2, LSN, rev B, Prf=3-4 MW.
Good strike point locations. Looks like I-mode most of the time.
Next shot: enable neon puff (0.45-0.65 s at 40 v)
|
| Aug 24 2012 12:42:05:013PM | 1120824007 | Robert Granetz |
Shot 07 -- Plasma, disrupts at 1.06 s due to an injection.
1 MA, 5.5 T, 0.7e20 m-2, LSN, rev B, Prf=3-4 MW. I-mode
Next shot: start neon puff at t=0.4 s (was t=0.45 s)
|
| Aug 24 2012 12:54:57:350PM | 1120824008 | Robert Granetz |
Shot 08 -- Plasma, disrupts during rampdown due to a locked mode.
1 MA, 5.5 T, 0.7e20 m-2, LSN, rev B, Prf=3-4 MW.
Next shot: increase neon puff to 60 volts; increase argon puff to 100 ms
|
| Aug 24 2012 01:05:33:867PM | 1120824009 | Robert Granetz |
Shot 09 -- Plasma, disrupts at t=1.23 s due to injection.
1 MA, 5.5 T, 0.7e20 m-2, LSN, rev B, Prf=3-4 MW. I-mode.
Next shot: shift entire neon puff 50 ms earlier
|
| Aug 24 2012 01:15:39:913PM | 1120824010 | Robert Granetz | Shot 10 -- Fizzle. Next shot: reduce prefill by 1 ms |
| Aug 24 2012 01:31:07:483PM | 1120824011 | Robert Granetz |
Shot 11 -- Plasma, full length. Nice hot steady I-mode.
1 MA, 5.5 T, 0.7e20 m-2, LSN, rev B, Prf = 4 -> 3 MW. I-mode.
Next shot: increase neon puff to 90 volts
|
| Aug 24 2012 01:46:35:607PM | 1120824012 | Robert Granetz |
Shot 12 -- Plasma, disrupted at t=0.58 s. Not sure if an injection was the cause or the result.
1 MA, 5.5 T, 0.7e20 m-2, LSN, rev B, Prf=4 MW briefly
Next shot: no DPCS changes
|
| Aug 24 2012 01:51:52:450PM | 1120824013 | Robert Granetz | Shot 13 -- Fizzle Next shot: reduce prefill another 1 ms |
| Aug 24 2012 02:14:04:120PM | 1120824014 | Robert Granetz |
Shot 14 -- Plasma, disrupted at t=1.52 s. Nice hot steady I-mode.
1 MA, 5.5 T, 0.7e20 m-2, LSN, rev B, Prf = 4 -> 3 MW. I-mode.
Cryo DFOL failure occurred. Cell access to fix.
Next shot: no DPCS changes; RF power waveform will be changed
|
| Aug 24 2012 02:52:09:413PM | 1120824015 | Robert Granetz |
Shot 15 -- Plasma, disrupted at t=1.44 s. Nice hot steady I-mode.
1 MA, 5.5 T, 0.7e20 m-2, LSN, rev B, Prf = 3 -> 5 MW. I-mode.
Next shot: set Ip at 1.3 MA and nl_04 to 0.95e20 m-2;
several minor tweaks on PG3 preprogramming, nl_04 gain, prefill pulse
|
| Aug 24 2012 02:56:59:660PM | 1120824016 | Robert Granetz |
Shot 16 -- Plasma, disrupted during rampdown. Nice hot steady I-mode.
1.3 MA, 5.5 T, 0.9e20 m-2, LSN, rev B, Prf = 3 -> 5 MW. I-mode.
Next shot: do the locked mode shot that's stored in seg 4, w/argon puff of 100 ms
|
| Aug 24 2012 03:06:33:187PM | 1120824017 | Robert Granetz | Shot 17 -- Plasma, locked mode, disrupts at t=1.07 s. But I had neon going in, as well as argon. Next shot: repeat the locked mode shot, but disable B-side-lower (neon) |
| Aug 24 2012 03:21:01:743PM | 1120824018 | Robert Granetz |
Shot 18 -- Plasma, full length. Locked mode HIREX calibration shot. Rotation locks at
t=0.7 s. Density pumps out and we eventually get a slideaway discharge.
Next shot: go back to the 1.3 MA I-mode discharge (shot 16), but increase the argon
puff to 125 ms
|
| Aug 24 2012 03:30:11:747PM | 1120824019 | Robert Granetz |
Shot 19 -- Plasma, full length.
1.3 MA, 5.5 T, 0.9e20 m-2, LSN, rev B, Prf = 3 -> 5 MW. I-mode.
I didn't re-enable the neon. Bad startup.
Next shot: re-enable B-side-lower (neon); increase prefill by 3 ms
|
| Aug 24 2012 03:50:05:707PM | 1120824020 | Robert Granetz |
Shot 20 -- Plasma, disrupted at t=1.14 s.
1.3 MA, 5.5 T, 0.9e20 m-2, LSN, rev B, Prf = 3 -> 4 MW. I-mode.
Next shot: set Ip to 0.7 MA and nl_04 to 0.51e20 m-2; reduce pre-fill by 3 ms; decrease
neon to 50 volts
|
| Aug 24 2012 03:59:25:350PM | 1120824021 | Robert Granetz |
Shot 21 -- Plasma, disrupted at t=0.53 s. Not sure why.
0.7 MA, 5.5 T, 0.5e20 m-2, LSN, rev B
Power room access to check tripped breaker
Next shot: no DPCS changes
|
| Aug 24 2012 04:16:25:527PM | 1120824022 | Robert Granetz |
Shot 22 -- Plasma, disrupted in rampdown.
0.7 MA, 5.5 T, 0.5e20 m-2, LSN, rev B, Prf = 3 -> 5 MW
Next shot: set nl_04 to 0.77e20 m-2
|
| Aug 24 2012 04:27:21:893PM | 1120824023 | Robert Granetz |
Shot 23 -- Plasma, disrupted in rampdown.
0.7 MA, 5.5 T, 0.8e20 m-2, LSN, rev B, Prf = 3 -> 5 MW
Poor startup
Next shot: set Ip to 0.85 MA and nl_04=0.93e20 m-2; increase pre-fill by 2 ms
|
| Aug 24 2012 04:47:40:523PM | 1120824024 | Robert Granetz |
Shot 24 -- Plasma, disrupted at t=0.83 s. Not sure why.
0.85 MA, 5.5 T, 0.8e20 m-2, LSN, rev B, Prf = 3 MW
Next shot: repeat; reduce pre-fill by 1 ms
|
| Aug 24 2012 04:46:27:633PM | 1120824025 | Robert Granetz | Shot 25 -- Dud. No EF3 Next shot: try again |
| Aug 24 2012 05:03:09:170PM | 1120824026 | Robert Granetz | Shot 26 -- Plasma, but disrupted at t=0.36 s. Maybe a cross-over problem. Next shot: tweak early Ip programming to change cross-over timing |
| Aug 24 2012 05:13:29:607PM | 1120824027 | Robert Granetz |
Shot 27 -- Plasma, disrupted during rampdown.
0.85 MA, 5.5 T, 0.8e20 m-2, LSN, rev B, Prf = 3 -> 5 MW, but J faulted a lot
End of run
|
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 10:42:23:890AM | Plasma | Ok | |
| 2 | 11:03:02:310AM | Plasma | Bad | Bad EFC |
| 3 | 11:32:15:493AM | Test | Ok | EFC Back Online |
| 4 | 11:41:20:397AM | Plasma | Ok | |
| 5 | 11:54:19:217AM | Plasma | Ok | |
| 6 | 12:11:32:233PM | Plasma | Ok | |
| 7 | 12:24:54:287PM | Plasma | Ok | |
| 8 | 12:42:55:443PM | Plasma | Ok | |
| 9 | 12:55:46:153PM | Plasma | Ok | |
| 10 | 01:09:04:140PM | Plasma | Ok | |
| 11 | 01:21:39:320PM | Plasma | Ok | |
| 12 | 01:35:09:603PM | Plasma | Ok | |
| 13 | 01:48:27:343PM | Plasma | Ok | |
| 14 | 02:00:59:007PM | Plasma | Ok | |
| 15 | 02:29:04:077PM | Plasma | Ok | |
| 16 | 02:44:49:653PM | Plasma | Ok | |
| 17 | 02:57:46:663PM | Plasma | Ok | |
| 18 | 03:10:15:997PM | Plasma | Ok | |
| 19 | 03:23:37:890PM | Plasma | Ok | |
| 20 | 03:36:50:857PM | Plasma | Ok | |
| 21 | 03:51:14:730PM | Plasma | Ok | |
| 22 | 04:03:39:520PM | Plasma | Ok | |
| 23 | 04:16:56:493PM | Plasma | Ok | |
| 24 | 04:30:09:903PM | Plasma | Ok | |
| 25 | 04:42:36:587PM | Plasma | Bad | EF3 Breaker opened during INIT |
| 26 | 04:56:15:980PM | Plasma | Ok | |
| 27 | 05:08:41:613PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Aug 24 2012 10:42:04:170AM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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