| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Catherine Fiore,Darin Ernst |
| Physics operator(s): | David Pace |
| Engineering operator(s): | Bill Parkin,Andy Pfeiffer,Bill Byford |
| Engineering Operator Run Comment |
| automatically entered by signon - please replace with real comment |
| Session Leader Plans |
| Entered: Jan 18 2011 05:22:03:923PM |
| Author: Catherine Fiore |
| MP521A continued
Resume run from yesterdays plan, shot 13, 5.22 T. Set up an EDA H-mode plasma at 5.5 T using 70 Mhz ICRF. Suggested target shot is 1100322007, but do not use the short pulse of 80 Mhz at 0.5 s. Use higher plasma current, 0.9 MA. Start without an argon pulse. Ensure that all of the other required diagnostics are obtaining good data: CXRS, MSE, PCI. Establish an ITB, then slowly add argon, 40 ms to begin. Increment until HIREX has adequate data. Once an ITB is established, begin scanning the magnetic field down in 0.1 T increments, reducing the plasma current to maintain fixed q_95 if possible. When ITB is lost, increase the magnetic field increment to 0.2 T until reaching 4.2 T Decrease the magnetic field increment to 0.1 T and continue until 3.9 T Once the field scan is completed, return to 5.4 T and add 80 Mhz central heating late in the pulse to hold the ITB in steady state. |
| Entered: Jan 19 2011 11:00:25:173AM |
| Author: Darin Ernst |
| Expect to start around 1:00 pm and continue Thursday. Boronization tonight.
GOAL: Develop strongly peaked ITB with off-axis heating. Apply modulated on-axis heating and fully document associated changes in core and edge fluctuations and kinetic profiles. Time permitting, use vertical jogs to double Thomson scattering radial coverage. PCI will be using mask. Fast TCI will be available in either single channel or two-channel (67.5, 69.0 cm) differential config. DNB, CXRS, and HIREX Sr. operational and acquiring good profile data. Set up 1100324019 5.4T 800kA Use 40ms Ar puff as in 1110118007. Keep same J-port 70 MHz with D-port 80 MHz, but leave D,E off. NOTE: Want to synchronize DNB pulses so they fall within the 50 ms on-axis heating pulses. Want the DNB pulses early in the on-axis heating for at least 20 ms for core Ti, Vphi measurement. Then DNB off for 20 ms for background subtraction. Te will rise about 40% in 14 ms following the start of the on-axis heating pulse. We may adjust the on-axis pulses to optimize, and may also change DNB timing. Check data acquisition by HIREX Sr., core CXRS, PCI, Reflectometry, fast TCI, ECE, TS, GPI, edge DNB CXRS, edge NINJA CXRS. Increase Ar puff as needed. Add D or E 80 MHz 50ms on / 50ms off 1.45 - 1.65 sec. Optimize timing and power of on-axis D- or E- port 80 MHz ICRH. (possibly several shots) Consider synchronizing DNB modulation relative to on-axis ICRH timing. Want DNB on during 50ms on-axis heating pulses. Monitor PCI, Mirnovs, Reflectometry, GPI for changes during on-axis heating pulses. Expect increased PCI fluctuations during on-axis heating, but diminished fluctuation levels on Mirnovs, Reflectometry, GPI, as in 1100324019. Once achieve optimized scenario, repeat to allow rotation of PCI mask. Add for comparison: 1. Baseline case without on-axis 80 MHz heating (if don't already have). 2. Case with earlier on-axis 80 MHz heating pulses, to confirm strong density gradient required to observe the bursts on PCI. Begin vertical jogs: Setup jogs similar to 1100324024 (asking for delta-Z = 4mm, and expecting overshoot, desire ~1 cm). Steve Wolfe's post-mortem simulation suggests success likely. Only the jogs will be copied from 1100324024, but other aspects of shot should be from whatever optimization we have achieved in this run. Check jog timing relative to TS. Want one laser just before jog, one laser immediately after jog. Repeat to allow rotation of PCI mask. |
| Physics Operators Plans |
| Entered: Jan 18 2011 05:07:24:017PM |
| Author: David Pace |
| -----------------
Engineering Setup ----------------- Run begins at 09:00 and ends at 17:00 Power systems as on: 1110118013 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) fill NINJA with 10 psi D2 DISABLED Enable gate-valves and shutters: ECE, VUV, HiREX Sr, Xeus Leave z-bolo shutter as is (should be open) Torvac gatevalve toggle (yes/no): no Boronization(yes/no): no Overnight ECDC (yes/no): yes, see below ICRF(yes/no): yes LH(yes/no): no Cryopump (yes/no): yes, starting with first shot DNB (yes/no): yes ------------------------------ ECDC Parameters ------------------------------ dP=120psi pulser .7s on- .3s off rmin/rdwell/rmax: 44/75/80 cm tdwell/tsweep: 60/120 s EF4 current: 0 A ------------------------------ Experimental Plan ------------------------------ 1. Will begin with continuation of Fiore's run MP #521a from the previous day. Load shot 1110118013. 2. Adapt run setups according to SL demands (MPs 521a and 602). |
| Session Leader Summaries |
| Entered: Jan 19 2011 05:24:33:113PM |
| Author: Catherine Fiore |
| MP521A continued
Resume run from yesterdays plan, shot 13, 5.22 T. Set up an EDA H-mode plasma at 5.5 T using 70 Mhz ICRF. Suggested target shot is 1100322007, but do not use the short pulse of 80 Mhz at 0.5 s. Use higher plasma current, 0.9 MA. Start without an argon pulse. Ensure that all of the other required diagnostics are obtaining good data: CXRS, MSE, PCI. Establish an ITB, then slowly add argon, 40 ms to begin. Increment until HIREX has adequate data. Once an ITB is established, begin scanning the magnetic field down in 0.1 T increments, reducing the plasma current to maintain fixed q_95 if possible. When ITB is lost, increase the magnetic field increment to 0.2 T until reaching 4.2 T Decrease the magnetic field increment to 0.1 T and continue until 3.9 T -------------- This run met the objectives of MP521a. The field scan was successful. It appears that we have adequate rotation profile data. ITBs appeared at the field extremes. Shots 12 and 15, at 3.9 T, had the best ITBs. _______ Once the field scan is completed, return to 5.4 T and add 80 Mhz central heating late in the pulse to hold the ITB in steady state. 1110119001 This shot had a nice long H-mode that was prime for devoloping an ITB, but didn't. This is what would be expected at 5.2 T. Unfortunately, the argon was not enabled so that we did not get the HIREX data. We will try to repeat this shot. 11110119002 Shot ended with a disruption, a breaker pulled. 1110119003 Several H-modes, no ITB. HIREX has data. We will continue the scan to 5T. 1110119004 Several H-modes, one nice long sustained one. No ITB, as expected for 5T. HIREX has data. We will continue the scan to 4.8T. 1110119005 Several H-modes. No ITB, as expected for 4.8T. HIREX has data. We will continue the scan to 4.6T. 1110119006 Several H-modes. No ITB, as expected for 4.6T. HIREX has data. We will continue the scan to 4.4T. 1110119007 Good long steady H-mode. No ITB, as expected at 4.4 T. Continue scanning to 4.2 T 1110119008 Two H-modes. No ITB, as expected for 4,2 T. HIREX has data. We will continue the scan to 4.0T. 1110119009 Three H-modes. Weak ITB on the first one, not on the other 2. We will repeat the 4.0T shot. 1110119010 Two H-modes. ITB on the first one. We will go to 4.1T which we skipped on the way down. 1110119011 Two H-modes. ITB on the first one. We will go to 3.9T. 1110119012 One H-mode. Best ITB of the day so far. We are going to repeat the 4.2 T shot, where we probably should have seen an ITB but didn't. 1110119013 The lack of an ITB at 4.2 T was reproducible. We are going to try to repeat shot 13 at 3.9 T. 1110119014 Disruption. 1110119015 This shot is nearly identical to shot 12, complete with ITB. We will now return to the low field side ITBs at 5.4 T 1110119016 This shot did not have any steady H-modes long enough to form an ITB. We will repeat the shot and try to get a steady EDA H-mode and ITB. This shot was at 5.4 T. 1110119017 This shot had3 H-modes, and an ITB that appears to have survied one of the back transitions. The run is being turned over now. [ |
| Entered: Jan 19 2011 07:55:12:050PM |
| Author: Darin Ernst |
| The machine and diagnostics performed very well for this run. We spent
most of the afternoon attempting to avoid early H-Mode back-transitions. These may in fact be caused by the ITB itself, rather than random impurity injections, as they were fairly consistent in time and occurred when the central density and Zeff rose sharply. The ITB developed much more quickly than in our previous best case 1100324019. We varied Bt, Ip, and target density, as well as on-axis (D,E) and off-axis power (J) to try to avoid the H-Mode back transitions. We were successful on shots 26 and 32. Shot 26 had a little too much on-axis heating, but was successfully controlled. In shot 32, we increased the J-port power to 2.4 MW, but also used D&E preheating. This avoided the back transition, but had no ITB. The early shots 18, 19 had great ITB's, but no on-axis heating, while 21 had a medium grade ITB successfully controlled by on-axis heating. For tomorrow's run, we plan to start by repeating shot 33, perhaps with lower target density, but making sure J-port power is the same as shot 32. We are seeing ne_ped ~ 3.2e20 m-3, which is a little large. *| shot| Bt| Ip| t1 H->L| ne0_max| J-port (MW)| D, E ports (MW)| ITB| comment| * 18 5.5 0.8 1.2 5 2.4 0 strong no on-axis power but great ITB * 19 5.5 0.8 1.2 5.5 2.2 0 strong amazing ITB at 1.16 sec 20 early disruption * 21 5.5 0.8 1.18 4.2 2.2 50ms/50ms @ 1.12 medium On-axis pulse successfully controlled ne0, Zeff 22 5.5 0.8 1.2 4 2 50ms/50ms @ 1.12 weak ITB not as pronounced as 21 23 5.5 0.8 1.07 ? 2 missed ITB strong HIREX Sr. shows incredible ITB in Ti, but no TS data for this shot 24 25 5.5 0.8 1.02 4 2 missed ITB strong very strong ITB killed early by back-transition * 26 5.5 0.9 none 5 2 60ms/40ms @ 1.2s medium ne_ped=3.2; on-axis controlled, but a little too strong 27 5.5 0.9 1.02 4 2 missed ITB strong very strong ITB killed early by back transition 28 5.5 1 0.9, 1.1, 1 4.4 2 missed ITB weak Periodic dithering H-modes 29 5.3 0.9 disrupted 30 5.3 0.9 1.17 4 2 preheat weak Inc. density nl04 to 1e20, preheat not good for ITB 31 5.3 0.85 0.86 4 2 preheat weak early back transition * 32 5.3 0.8 none 3.6 2.4 preheat, extra no add 400kW E 1.1-1.2, no ITB, but NO BACK TRANSITION 33 early RF fault |
| Entered: Jan 20 2011 09:02:43:357AM |
| Author: Darin Ernst |
| Some RF conditioning shots...following boronization. |
| Physics Operator Summaries |
| Entered: Jan 19 2011 05:32:32:340PM |
| Author: David Pace |
| Startup ---
The last shot of the day features the best startup achieved, shot 1110119033. A 10 A change to EF4 and slight increase in PG4 were incorporated this afternoon. Disruptions --- All disruptions were addressed by repeating the shot. In each case the plasma ran full on the next attempt. General --- Another good learning experience for the Physics Operator. The tokamak ran well and all problems were addressed by the Engineering Team with no time delay in operations. PIEZO_CHOPPER and XJUMP deactivated: Shot 22 was fired without the XJUMP and PIEZO_CHOPPER procedures. After the switch to the afternoon experiment I loaded the reference shot from March 2010 (1100324019). I loaded this shot in its entirety to verify that segment 2 was used as the active segment. Once this reference was loaded, however, I simply brought over the startup segment from today's run. This caused a problem because the two necessary procedures were not active in the reference shot from March 2010. Shot 22 produced a large hard x-ray population and created a red zone on the limiter tile monitors. It was interesting that the shot actually recovered and ran after the poor startup. Lesson Learned: While it may be helpful to confirm the active segments of older shots, the loaded programming should always include a recently completed discharge. The presence of the PIEZO_CHOPPER is easily confirmed because the gas puffs under its control will be chopped when it is active. Argon Pulse: No Ar puff was produced on shot 1, though the SL had requested it to be active. Lesson Learned: B-side lower was still DISABLED. The PO needs to request that it be ENABLED in order to produce gas. |
| Session Leader Comments | |||
| Jan 19 2011 10:33:20:920AM | 1110119001 | Catherine Fiore | This shot had a nice long H-mode that was prime for devoloping an ITB, but didn't. This is what would be expected at 5.2 T. Unfortunately, the argon was not enabled so that we did not get the HIREX data. We will try to repeat this shot. |
| Jan 19 2011 10:34:12:793AM | 1110119002 | Catherine Fiore | Shot ended with a disruption, a breaker pulled. |
| Jan 19 2011 10:35:04:407AM | 1110119003 | Catherine Fiore | Several H-modes, no ITB. HIREX has data. We will continue the scan to 5T. |
| Jan 19 2011 10:35:45:010AM | 1110119004 | Catherine Fiore | Several H-modes, one nice long sustained one. No ITB, as expected for 5T. HIREX has data. We will continue the scan to 4.8T. |
| Jan 19 2011 10:26:39:340AM | 1110119005 | Catherine Fiore | Several H-modes. No ITB, as expected for 4.8T. HIREX has data. We will continue the scan to 4.6T. |
| Jan 19 2011 10:23:24:970AM | 1110119006 | Catherine Fiore | Several H-modes. No ITB, as expected for 4.6T. HIREX has data. We will continue the scan to 4.4T. |
| Jan 19 2011 10:31:36:273AM | 1110119007 | Catherine Fiore | Good long steady H-mode. No ITB, as expected at 4.4 T. Continue scanning to 4.2 T |
| Jan 19 2011 10:48:04:503AM | 1110119008 | Catherine Fiore | Two H-modes. No ITB, as expected for 4,2 T. HIREX has data. We will continue the scan to 4.0T. |
| Jan 19 2011 11:05:07:893AM | 1110119009 | Catherine Fiore | Three H-modes. Weak ITB on the first one, not on the other 2. We will repeat the 4.0T shot. |
| Jan 19 2011 11:19:10:457AM | 1110119010 | Catherine Fiore | Two H-modes. ITB on the first one. We will go to 4.1T which we skipped on the way down. |
| Jan 19 2011 11:33:21:680AM | 1110119011 | Catherine Fiore | Two H-modes. ITB on the first one. We will go to 3.9T. |
| Jan 19 2011 11:49:10:180AM | 1110119012 | Catherine Fiore | One H-mode. Best ITB of the day so far. We are going to repeat the 4.2 T shot, where we probably should have seen an ITB but didn't. |
| Jan 19 2011 12:00:55:910PM | 1110119013 | Catherine Fiore | The lack of an ITB at 4.2 T was reproducible. We are going to try to repeat shot 13 at 3.9 T. |
| Jan 19 2011 12:16:05:177PM | 1110119014 | Catherine Fiore | Disruption |
| Jan 19 2011 12:32:29:247PM | 1110119015 | Catherine Fiore | This shot is nearly identical to shot 12, complete with ITB. We will now return to the low field side ITBs at 5.4 T |
| Jan 19 2011 12:51:41:020PM | 1110119016 | Catherine Fiore | This shot did not have any steady H-modes long enough to form an ITB. We will repeat the shot and try to get a steady EDA H-mode and ITB. This shot was at 5.4 T. |
| Jan 19 2011 01:04:38:830PM | 1110119017 | Catherine Fiore | This shot had3 H-modes, and an ITB that appears to yhave survied one of the back transitions. The run is being turned over now. |
| Jan 19 2011 01:12:44:280PM | 1110119018 | Darin Ernst | This will be with off-axis J-port only, to establish ITB.
Add on-axis D,E once have good ITB going, successive shots. NINJA 1.4 sec. |
| Jan 19 2011 01:22:59:050PM | 1110119018 | Darin Ernst | RF faulted about 1.2 sec. No sign of impurity injection. Similar fault
on shot 17 about same time. H-Mode back transition at 1.2. Good ITB. NEXT: Hope for no fault next time, set up on-axis ICRH as in 1100324019. On axis D,E 50 ms on, 50ms off, starting 1.45 sec. |
| Jan 19 2011 01:24:26:503PM | 1110119018 | Darin Ernst | RF faulted about 1.2 sec. No sign of impurity injection. Similar fault
on shot 17 about same time. H-Mode back transition at 1.2. Good ITB. NEXT: Hope for no fault next time, set up on-axis ICRH as in 1100324019. On axis D,E 50 ms on, 50ms off, starting 1.45 sec. Drop J port power by 10% to try to avoid fault. |
| Jan 19 2011 01:37:17:650PM | 1110119019 | Darin Ernst | RF faulted slightly earlier. Looks like ne0 made it to 5.3e20 m-3. So
try some on-axis at 1.15 sec. Just move the on-axis modulation to start at 1.15 sec. |
| Jan 19 2011 01:39:04:540PM | 1110119019 | Darin Ernst | RF faulted slightly earlier. Looks like ne0 made it to 5.3e20 m-3. So
try some on-axis at 1.15 sec. Just move the on-axis modulation to start at 1.15 sec. Looks like we are getting ITB peaking at a much faster rate than 1100324019. We need to control the impurity accumulation earlier than before. |
| Jan 19 2011 01:46:51:647PM | 1110119020 | Darin Ernst | Early disruption due to possible large injection... |
| Jan 19 2011 01:51:09:450PM | 1110119021 | Darin Ernst | Repeat 20.
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| Jan 19 2011 01:52:25:417PM | 1110119021 | Darin Ernst | Repeat 20, but move D,E to 1.12 sec. insteadl of 1.15 sec.
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| Jan 19 2011 02:14:21:510PM | 1110119022 | Darin Ernst |
Looks like 80 MHz on-axis power controlled Zeff and prad (got nice plateaus), but soft xray shows activity just prior to fault. Back off on the on-axis power to 700 kW pulses, adjust period to 60 ms on, 40 ms off. Next shot: DNB will be 40 ms on, 60 ms off, with one of the pulses starting at 1.12 sec. |
| Jan 19 2011 02:15:27:753PM | 1110119022 | Darin Ernst | Looks like 80 MHz on-axis power controlled Zeff and prad (got nice plateaus),
but soft xray shows activity just prior to fault. Back off on the on-axis power to 700 kW pulses, adjust period to 60 ms on, 40 ms off. Next shot: DNB will be 40 ms on, 60 ms off, with one of the pulses starting at 1.12 sec. Still trying to optimize on-axis RF to maintain ITB beyond 1.2 sec. |
| Jan 19 2011 02:27:13:980PM | 1110119023 | Darin Ernst | Repeat to see if startup changes help.
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| Jan 19 2011 02:34:42:803PM | 1110119023 | Darin Ernst | Repeat to see if startup changes help.
Take on-axis power back up to 1 MW, turn J-port down slightly. |
| Jan 19 2011 02:45:07:213PM | 1110119023 | Darin Ernst | Repeat to see if startup changes help.
Take on-axis power back up to 1 MW, turn J-port down slightly. J-port fault 1.07 s or so -> H-Mode back transition. Repeat with even less J-port power. |
| Jan 19 2011 02:48:57:187PM | 1110119023 | Darin Ernst | Repeat to see if startup changes help.
Take on-axis power back up to 1 MW, turn J-port down slightly. J-port fault 1.07 s or so -> H-Mode back transition. Repeat with even less J-port power. Seeing moderate ITB's, probably want to delay on-axis power next time. On axis power raising Te from 1.5 to 2.7 keV. Check core TS data. |
| Jan 19 2011 03:00:08:807PM | 1110119024 | Darin Ernst | Bonked.
Next shot: Delay on-axis power to 1.2 sec. to improve peaking. |
| Jan 19 2011 03:01:28:290PM | 1110119024 | Darin Ernst | Bonked.
Next repeat. 26: Delay on-axis power to 1.2 sec. to improve peaking. |
| Jan 19 2011 03:06:19:950PM | 1110119026 | Darin Ernst | Move from 800 kA to 900kA, stay at 5.4 T.
On-axis RF starting 1.2 sec. |
| Jan 19 2011 03:24:12:810PM | 1110119026 | Darin Ernst | Move from 800 kA to 900kA, stay at 5.4 T.
On-axis RF starting 1.2 sec. Great shot -- but too much on-axis to early. Change to 100 ms between pulses, instead of 40 ms. |
| Jan 19 2011 03:24:58:443PM | 1110119026 | Darin Ernst | Move from 800 kA to 900kA, stay at 5.4 T.
On-axis RF starting 1.2 sec. Great shot -- but too much on-axis to early. Change to 100 ms between pulses, instead of 40 ms. |
| Jan 19 2011 03:41:27:727PM | 1110119027 | Darin Ernst | ITB formation very similar to 26 until back transition.
Try going to 1 MA, 5.5 T. |
| Jan 19 2011 03:51:31:543PM | 1110119027 | Darin Ernst | ITB formation very similar to 26 until back transition (moly injection at ~ 1.0s)
Try going to 1 MA, 5.5 T. |
| Jan 19 2011 03:55:14:630PM | 1110119028 | Darin Ernst | Looks like a dithering H-Mode. No time for ITB formation.
Maybe raising Bt raised the H-Mode threshold a little too high. Move back to lower Bt = 5.3 T. Access requested. |
| Jan 19 2011 04:03:52:047PM | 1110119028 | Darin Ernst | Looks like a dithering H-Mode. No time for ITB formation.
Maybe raising Bt raised the H-Mode threshold a little too high. Move back to lower Bt = 5.3 T. Move to 0.9 MA at 5.3 T. 1 MA EDA is tough to do. Access requested. |
| Jan 19 2011 04:14:21:620PM | 1110119029 | Darin Ernst | Brick?
Next shot: Steve Wukitch suggests raising target density from 0.9 to 1.0, also adding D&E at 1 MW each starting 0.6s, then ramping down to zero at J ramps up. |
| Jan 19 2011 04:33:30:363PM | 1110119030 | Darin Ernst | Back to the back-transition at 1.2 sec. Try raising density 10% and
lowering Ip to 850 kA per SW suggestion. To me it looks as if perhaps the ITB is reducing power flow through the edge, which may be causing the H-Mode back transition. Try adding on-axis 400 kW at 1.1 - 1.2. |
| Jan 19 2011 04:50:07:083PM | 1110119031 | Darin Ernst | Back to the back-transition at 1.2 sec. Try raising density 10% and
lowering Ip to 850 kA per SW suggestion. To me it looks as if perhaps the ITB is reducing power flow through the edge, which may be causing the H-Mode back transition. Try adding on-axis 400 kW at 1.1 - 1.2. RESULT: back transition at ~ 0.86 sec. Moderate ITB in second H-Mode reaching ne0 ~ 4. Next: try raising J-port power to 2.4 MW. |
| Jan 19 2011 05:02:51:577PM | 1110119032 | Darin Ernst | Raised J-port power to 2.4 MW.
Result: NO BACK TRANSITIONS! But, no ITB to speak of. NEXT: remove on-axis pre-heat and on-axis heating from 1.1-1.2. Also reduce on-axis power pulses to 800 kW. |
| Jan 19 2011 05:22:02:640PM | 1110119033 | Darin Ernst | Remove on-axis pre-heat and on-axis heating from 1.1-1.2.
Also reduce on-axis power pulses to 800 kW. Looks like RF fault at 0.8 sec. Next time: Raise Bt back up to 5.4 T, since 5.3 T makes ITB formation harder. Keep J-port at 2.4 MW. Try lowering the target density, now that we have sufficient J-port power to stay in H-mode. Thanks to all -- see you tomorrow for more excitement. |
| Physics Operator Comments | |||
| Jan 19 2011 09:11:14:977AM | 1110119001 | David Pace | Shot 1 Plan:
Repeat shot 1110118013 (last shot from yesterday's run). Shot 1 Actuality: Full shot. The countdown was not broadcast, but that does not necessarily indicate any problem. GPC traces on bounce scope (see pace/scopes/ops/bounce_gpc) indicate a startup bounce as J. Hughes reported yesterday. Performance looks good and SL is pleased with shot so there is no motivation for startup changes as of yet. Argon pulse from B-side lower (PG1) was programmed, but PO did not request it to be enabled so there was no gas. It will be enabled for the next shot. |
| Jan 19 2011 09:24:49:570AM | 1110119002 | David Pace | Shot 2 Plan:
Repeat shot 1, but add Ar puff from B-side lower (PG1). This was not available on shot 1 due to PO error. Shot 2 Actuality: Spike on OH2 supplies at t = 0.4 s caused breaker to fire and ended shot. Injection is noted on bolometer immediately preceding this OH2 spike. Engineering Team is resetting the breaker(s). Need to determine whether the early injection can be avoided on the next shot. |
| Jan 19 2011 09:35:58:320AM | 1110119003 | David Pace | Shot 3 Plan:
Repeat shot 1. No changes made from shot 2. If there is another injection on this shot, then we will try to adjust plasma positioning during this early time period. Shot 3 Actuality: Full length shot. No injection near t = 0.4 s. |
| Jan 19 2011 09:50:08:823AM | 1110119004 | David Pace | Shot 4 Plan:
Set a 5 T shot at 818 kA. Begin with shot 3 and make the following changes: - reduce TF current to -137.888 kA to achieve 5 T operation - reduced plasma current to -818 kA to maintain q-values as SL desires Shot 4 Actuality: Full length shot. Injection (must have been small?) near t = 0.15 s, but we survived with only a small reduction in plasma current. Bounce may have been reduced, though there are still notches in the startup GPC signals. |
| Jan 19 2011 10:03:57:593AM | 1110119005 | David Pace | Shot 5 Plan:
Set a 4.8 T shot at 785 kA. Begin with shot 4 and make the following changes: - reduce TF current to -131.969 kA to achieve 4.8 T operation - reduced plasma current to -785 kA to maintain q-values as SL desires This setup is completed very quickly thanks to the excellent notes and data table provided by J. Hughes during his PhysOp work yesterday. Shot 5 Actuality: Full length shot. Clean startup. |
| Jan 19 2011 10:19:27:587AM | 1110119006 | David Pace | Shot 6 Plan:
Set a 4.6 T shot at 753 kA. Begin with shot 5 and make the following changes: - reduce TF current to -126.051 kA to achieve 4.6 T operation - reduced plasma current to -753 kA to maintain q-values as SL desires This setup is completed very quickly thanks to the excellent notes and data table provided by J. Hughes during his PhysOp work yesterday. Shot 6 Actuality: Full length shot. Looks like a small injection slightly reduced the plasma current near t = 0.015 s. |
| Jan 19 2011 10:31:17:297AM | 1110119007 | David Pace | Shot 7 Plan:
Cell access prior to shot 7. Set a 4.4 T shot at 720 kA. Begin with shot 6 and make the following changes: - reduce TF current to -120.132 kA to achieve 4.4 T operation - reduced plasma current to -720 kA to maintain q-values as SL desires This setup is completed very quickly thanks to the excellent notes and data table provided by J. Hughes during his PhysOp work yesterday. Shot 7 Actuality: Full length shot, no pathologies. |
| Jan 19 2011 10:45:56:310AM | 1110119008 | David Pace | Shot 8 Plan:
Set a 4.2 T shot at 687 kA. Begin with shot 7 and make the following changes: - reduce TF current to -114.214 kA to achieve 4.2 T operation - reduced plasma current to -687 kA to maintain q-values as SL desires This setup is completed very quickly thanks to the excellent notes and data table provided by J. Hughes during his PhysOp work yesterday. Shot 8 Actuality: Full length shot. |
| Jan 19 2011 11:00:35:923AM | 1110119009 | David Pace | Shot 9 Plan:
Set a 4.0 T shot at 655 kA. Begin with shot 8 and make the following changes: - reduce TF current to -108.295 kA to achieve 4.0 T operation - reduced plasma current to -655 kA to maintain q-values as SL desires This setup is completed very quickly thanks to the excellent notes and data table provided by J. Hughes during his PhysOp work yesterday. Shot 9 Actuality: Full length shot. |
| Jan 19 2011 11:15:42:543AM | 1110119010 | David Pace | Shot 10 Plan:
Repeat shot 9 (4 T, 655 kA) Shot 10 Actuality: Full length shot. Density evolution differs from previous shot due to different times of ICRH trips. |
| Jan 19 2011 11:31:09:590AM | 1110119011 | David Pace | Shot 11 Plan:
Set a 4.1 T shot at 671 kA. Begin with shot 10 and make the following changes: - change TF current to -111.254 kA to achieve 4.1 T operation - change plasma current to -671 kA to maintain q-values as SL desires Shot 11 Actuality: Full length shot. |
| Jan 19 2011 11:44:44:980AM | 1110119012 | David Pace | Shot 12 Plan:
Set a 3.9 T shot at 638 kA. Begin with shot 11 and make the following changes: - change TF current to -105.336 kA to achieve 3.9 T operation - change plasma current to -638 kA to maintain q-values as SL desires Shot 12 Actuality: Full length shot. |
| Jan 19 2011 12:00:12:800PM | 1110119013 | David Pace | Shot 13 Plan:
Repeat shot 8, 4.2 T at 687 kA. Reloaded shot 1110119008 Shot 13 Actuality: Full length shot. |
| Jan 19 2011 12:25:11:300PM | 1110119014 | David Pace | Shot 14 Plan:
Repeat shot 12, 3.9 T at 638 kA. Reloaded shot 1110119012 Shot 14 Actuality: Disruption at t = 0.03 s. Will repeat as remedy. |
| Jan 19 2011 12:26:08:227PM | 1110119015 | David Pace | Shot 15 Plan:
Repeat shot 14 (3.9 T at 638 kA) but without the disruption. Shot 15 Actuality: Full length shot. |
| Jan 19 2011 12:42:45:783PM | 1110119016 | David Pace | Shot 16 Plan:
Return to 5.4 T operation. Begin with shot 15 and then, - change TF current to -149.725 kA for 5.4 T operation - change plasma current to 884 kA to achieve SL's desired q-values Shot 16 Actuality: Full length shot. |
| Jan 19 2011 01:03:06:773PM | 1110119017 | David Pace | Shot 17 Plan:
Repeat shot 16 (5.4 T at 884 kA) Shot 17 Actuality: Full length shot. |
| Jan 19 2011 01:34:47:420PM | 1110119018 | David Pace | ** This is the first shot of the afternoon experiment, MP #602**
Shot 18 Plan: 5.4 T at 800 kA - load segment 1 from 1110119017 to use a good, recent startup - load segment 2 from 1100324019 as requested by SL - change PG1 in segment 2 to match that from the other shots today Shot 18 Actuality: Full length shot. Startup quality reproduced from earlier shots of the day (as expected since we are using the same startup segment). Achieved H-mode and possibly ITB. The DPCS_PIEZO_CHOPPER was off for this shot. This occurred because of an error on my part. By reloading the reference shot from March 2010, I also updated the OUTPUT_PROS and turned off the gas chopper. Wolfe caught this issue so shot 18 is the only problematic one. For reference, reviewing the gas scopes should make it obvious whether the chopper is on because the pulses will not be chopped if it is off. |
| Jan 19 2011 01:37:59:850PM | 1110119019 | David Pace | Shot 19 Plan:
Repeat shot 18 (5.4 T at 800 kA) Shot 19 Actuality: Full length shot. Back transition (or equivalent) slightly earlier than 1.2 seconds. Small injection at 0.015 s reduces current slightly; plasma recovers. |
| Jan 19 2011 01:54:31:137PM | 1110119020 | David Pace | Shot 20 Plan:
Repeat shot 20 (5.4 T at 800 kA) - only ICRH changes requested Shot 20 Actuality: Early disruption. Bounce scope GPC series shows that plasma may have moved inward to early. Since no changes were made between this shot and 19, I think we should try this one more time. |
| Jan 19 2011 02:08:17:227PM | 1110119021 | David Pace | Shot 21 Plan:
Repeat shot 20 (5.4 T at 800 kA), but without the disruption. Shot 21 Actuality: Full length shot. Still observing loss of H-mode near 1.2 s. |
| Jan 19 2011 02:39:13:780PM | 1110119023 | David Pace | Shot 23 Plan:
Repeat shot 21 (5.4 T at 800 kA). Changes to startup, - increased PG4 by 10% to 53 ms - made EF4 current 10 A more positive: from t = -0.29 to -0.0071 set this to -1300 A (was -1310 A) Shot 23 Actuality: Full length shot with much improved startup (Bz0 closer to zero and bounce traces indicate less bouncing). |
| Jan 19 2011 02:57:52:043PM | 1110119024 | David Pace | Shot 24 Plan:
Repeat shot 23 (5.4 T at 800 kA). Shot 24 Actuality: Fizzle. Comparing with previous shot to determine the cause, - power supplies look the same - Bz0 looks the same - pressure looks the same |
| Jan 19 2011 03:05:54:070PM | 1110119025 | David Pace | Shot 25 Plan:
Repeat shot 24 (5.4 T at 800 kA), but successfully run a full length plasma this time. Shot 25 Actuality: Full length shot. |
| Jan 19 2011 03:20:23:570PM | 1110119026 | David Pace | Shot 26 Plan:
Repeat shot 25, but increase plasma current to 900 kA. Shot 26 Actuality: Full length shot. Disruption in rampdown. |
| Jan 19 2011 03:35:56:440PM | 1110119027 | David Pace | Shot 27 Plan:
Repeat shot 26. Shot 27 Actuality: Good shot, disrupted in rampdown, progressed slightly later in time compared to 26. |
| Jan 19 2011 03:38:59:313PM | 1110119028 | David Pace | Shot 28 Plan:
5.5 T at 1.0 MA Begin with shot 27 and increase plasma current to 1.0 MA and TF current to -152.685 kA. Shot 28 Actuality: |
| Jan 19 2011 04:13:46:733PM | 1110119029 | David Pace | Shot 29 Plan:
Power room access prior to this shot to allow the Engineering Team to investigate a misc. fault on OH2. 5.3 T at 0.9 MA Begin with shot 28 - change TF current to -146.766 kA for 5.3 T operation. - change plasma current to 0.9 MA Shot 29 Actuality: Disruption. |
| Jan 19 2011 04:23:21:983PM | 1110119030 | David Pace | Shot 30 Plan:
5.3 T at 0.9 MA Begin with shot 29 - increase density, nl04 to 1e20 Shot 30 Actuality: Disruption in rampdown. |
| Jan 19 2011 04:43:11:087PM | 1110119031 | David Pace | Shot 31 Plan:
5.3 T at 0.85 MA Begin with shot 30 - increase density, nl04 to 1.1e20 - decrease plasma current to 0.85 MA Shot 31 Actuality: Full length shot. |
| Jan 19 2011 04:58:35:260PM | 1110119032 | David Pace | Shot 32 Plan:
Repeat shot 31. Shot 32 Actuality: Full length shot. |
| Jan 19 2011 05:11:37:020PM | 1110119033 | David Pace | Shot 33 Plan:
Repeat shot 32. Shot 33 Actuality: Disruption in rampdown. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:01:12:300AM | Plasma | Ok | |
| 2 | 09:13:30:363AM | Plasma | Ok | PF breaker opened after plasma disrupted |
| 3 | 09:30:29:817AM | Plasma | Ok | |
| 4 | 09:44:51:483AM | Plasma | Ok | |
| 5 | 09:58:41:683AM | Plasma | Ok | |
| 6 | 10:12:59:940AM | Plasma | Ok | |
| 7 | 10:26:52:207AM | Plasma | Ok | |
| 8 | 10:41:42:367AM | Plasma | Ok | |
| 9 | 10:55:58:360AM | Plasma | Ok | |
| 10 | 11:11:21:240AM | Plasma | Ok | |
| 11 | 11:25:57:483AM | Plasma | Ok | |
| 12 | 11:41:40:657AM | Plasma | Ok | |
| 13 | 11:56:34:033AM | Plasma | Ok | |
| 14 | 12:11:07:247PM | Plasma | Ok | |
| 15 | 12:23:49:213PM | Plasma | Ok | |
| 16 | 12:38:23:503PM | Plasma | Ok | |
| 17 | 12:59:27:070PM | Plasma | Ok | |
| 18 | 01:13:31:873PM | Plasma | Ok | |
| 19 | 01:28:24:293PM | Plasma | Ok | |
| 20 | 01:44:09:427PM | Plasma | Ok | |
| 21 | 01:56:53:120PM | Plasma | Ok | |
| 22 | 02:12:11:710PM | Plasma | Ok | |
| 23 | 02:34:27:473PM | Plasma | Ok | |
| 24 | 02:48:07:670PM | Plasma | Ok | |
| 25 | 03:00:56:583PM | Plasma | Ok | |
| 26 | 03:14:51:560PM | Plasma | Ok | |
| 27 | 03:29:08:637PM | Plasma | Ok | |
| 28 | 03:44:24:947PM | Plasma | Ok | |
| 29 | 04:04:47:020PM | Plasma | Ok | |
| 30 | 04:18:31:440PM | Plasma | Ok | |
| 31 | 04:38:16:367PM | Plasma | Ok | |
| 32 | 04:51:55:923PM | Plasma | Ok | |
| 33 | 05:08:18:860PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Jan 19 2011 09:00:57:237AM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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