Miniproposals

Miniproposal: 493 Date Filed: 6/18/2007 Title: Ohmic L-H Threshold Experiments First Author: Brian Labombard Session Leader: Brian Labombard (shots 1-34)

Engineering Operator Run Comment

MP493 Ohmic L-H Threshold Experiments SL: Brian LaBombard PO: Earl Marma

Session Leader Plans

Entered: Jan 23 2008 01:10:07:327PM

Author: Brian Labombard

Run Plan for 1080124 MP#493 "Ohmic L-H Threshold Experiments" Goal Investigate in detail the plasma conditions near the last-closed flux surface (pressure gradients, collisionality, plasma flows, ...) that are associated with ohmic L-H transitions. Approach We will "dial-up" some ohmic H-modes by the usual method of ramping the toroidal field down and then back up slightly after L-H transition. We will look at edge plasma flows and gradients just before and after transition with all available edge diagnositcs. In particular, we will be taking the time to optimize scanning probe insertion depths and times so as to cleanly resolve the velocity shear layer - this will involve taking some risks with the probes. Plan Start by reloading shot#1070710012. This was an NL04 = 0.75e20, Ip= 0.8 MA ohmic only shot with the desired TF rampdown, exhibiting an L-H transition at 1.0 s. If necessary, tweak ohmic H-mode start time and transition from ELM-free to EDA by adjusting TF ramp and starting density. A. 0.8 MA, LSN - 8 shots i. Optimize scanning probe plunge depths and scan times to record conditions just before (1 scan) and during H-mode (2 scans). ii. Scan probes to record conditions well before the L-H transition, while q95 is ramping down. B. 0.8 MA, USN - 2 shots Reload from shot #1071220010 (which ran on segment#3?). Then, program same plasma current, TF ramp and target density as in "A". Also, reduce inner gap by 1 mm and reduce the outer gap by 3 mm. i. Optimize scanning probe plunge depths and scan times to record conditions as q95 is ramping down (0.5, 0.75, 1.0 s) - make sure that the probes scan deep enough to resolve shear layer. C. 0.6 MA, LSN - 8 shots Go back to LSN discharge. Reprogram for 0.6 MA. Start the TF ramp-down earlier so as to attain ~2.2 tesla by 1.0s and then back up to 2.7 tesla. Program NL04 ~ 0.6 x10^20 m^-2. Optimize ohmic H-mode (start time, transition from ELM-free to EDA) by adjusting TF ramp and starting density. i. Optimize scanning probe plunge depths and scan times to record conditions just before (1 scan) and during H-mode (2 scans). ii. Optimize scanning probe plunge depths and scan times to record conditions well before the L-H transition, while q95 is ramping down. D. 0.6 MA, USN - 2 shots Reload a shot from "B" above. Program same plasma current, TF ramp and target density as in "C". i. Optimize scanning probe plunge depths and scan times to record conditions as q95 is ramping down (0.5, 0.75, 1.0 s) - make sure that the probes scan deep enough to resolve shear layer. E. 1.2 MA, LSN - 6 shots Back to LSN discharge, but with plasma current of 1.2 MA and toroidal field of 6 tesla. Program TF ramp-down to 4.4 tesla by 0.9s and then back up to 5.4 tesla. Program NL04 ~ 0.7 x10^20 m^-2. Optimize ohmic H-mode (start time, transition from ELM-free to EDA) by adjusting TF ramp and starting density. i. Optimize scanning probe plunge depths and scan times to record conditions just before (1 scan) and during H-mode (2 scans). F. 1.2 MA, USN - 2 shots Reload a shot from "D" above. Program same plasma current, TF ramp and target density as in "E". i. Optimize scanning probe plunge depths and scan times to record conditions as q95 is ramping down (0.5, 0.7, 0.9 s) - make sure that the probes scan deep enough to resolve shear layer.

Physics Operators Plans

Entered: Jan 23 2008 05:25:24:027PM

Author: Earl Marmar

Engineering Setup ----------------- Run begins at 09:00 and ends at 17:00 MP493 Ohmic L-H Threshold Experiments SL: Brian LaBombard PO: Earl Marmar Power systems as on: 1070710012 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 5 psi helium DISABLED Enable gatevalves and shutters: ECE, VUV, DNB, Z-bolo Torvac gatevalve toggle (yes/no): no Boronization(yes/no): no Overnight ECDC (yes/no): yes ICRF(yes/no): no LH(yes/no): no DNB(yes/no): yes (if available) Cryopump (yes/no): no Vessel temperature: 35/35/35 ------------------------------ ECDC Parameters ------------------------------ gas and pressure: D2 at 2e-4 Torr sweep: 44/45/103 cm scan: 20/120 s vessel temp: 60/60/60

Session Leader Summaries

Entered: Jan 24 2008 10:38:40:377PM

Author: Brian Labombard

Run Summary for 1080124 MP#493 ""Ohmic L-H Threshold Experiments"" This was a very productive run, with only 4 shots out of 34 lost to fizzle, power supply dud or data system hang. We started out by reloading an ohmic H-mode shot from last July, 1070710012. On the first plasma attempt, the discharge was reproduced, being a virtual clone of the July shot. Shots 2-10 focussed on getting all three scanning probes (ASP, FSP, WASP) reaching the last closed flux surface in three separate scans (0.6, 0.8, 1.05 s) as the TF was ramped down to utlimately produce an ohmic H-mode (0.8 MA discharges). By shot #10, we managed to accomplish this goal. The probes recorded some clean n, Te profiles as well as parallel and perpendicular flow profiles. The velocity shear layer was well resolved, showing its characteristic jump-up towards the electron diamagnetic direction, just before reaching the last-closed flux surface (both in perpendicular Mach number and in the phase velocities of the fluctuations). No obvious changes in the shear layer were evident despite the different q values of 3.5, 3.1, and 2.6 in L-mode. Shots 11-17 were dedicated to recording the H-mode profiles by targeting the probes for a single scan just after the L-H transition. The ohmic H-modes were ELM-free and short-lived - a consequence of the boronization layer being worn off. But since the goal today was primarily focused on studying the L-mode conditions that spawn the H-mode, this behavior was acceptable. It took some patience, but shots 16 and 17 rewarded us with some nice profiles with ASP and FSP scanning as far as possible in ELM-free H-mode, resolving the shear layer. While the jump in perpendicular velocities looked about the same across the shear layer, the perpendicular scale length did look a bit shorter. The pressure and temperature scale lengths were extremely short, looking like the probe hit a 'wall' of hot plasma. In retrospect, it would have been interesting to probe some EDA H-modes to see if the shear layer relaxes a bit in this case, but this will have to be saved for another run, preferably after boronization. Also it would have been smart to get some outboard CXRS measurements of flows and rotation. But the DNB was off-line and under repair - another reason to try some of these discharges again. Istvan and Jim also puffed the NINJA at these discharges at various times, recording fluctuation phase velocity information from the GPI diode and camera systems. Shots 18-25 were an attempt to cover part B of the run plan, dialing up some matched USN discharges that were otherwise identical to the LSN ones. But, we failed to get any of these discharges to continue without disruption beyond about 1s, with no obvious reason why. Perhaps the low q (< 3) discharges are somehow incompatible with USN? Anyway, rather than bang our heads on this much further, we moved on to part C of the run plan - 0.6 MA LSN ohmic H-mode discharges. These went pretty well, yielding an L-H transition (actually many of them) when q dropped below 2.6. By shot 30, we got some very nice profile data in L-mode up to a time just prior to the first L-H transition. No H-mode profile data was taken, since our shot count was high and we wanted to look at some 1.2 MA discharges. Skipping part D (more USN discharges), we went right to part E (1.2 MA). Shots 31, 33, and 34 netted us some nice profile data, including shear layer information in the L-mode phase as q was ramped down, from 3.4 to 3.1 to 2.9. Running out of time, no data was taken in the H-mode phase or for part F of the MP (1.2 MA USN). The good news is that all scanning probes survived the run intact. (You may recall that we toasted all three scanning probes in the last attempt at this MP in July.) Moreover, the SW electrode on the WASP probe, which was exhibiting some intermittent opens earlier, worked perfectly on the last shot. While this MP is still not complete (need to fugure out the problems with the USN plasmas, record more H-mode profiles and get CXRS data), we certainly collected some very nice data today to chew on. ___________________________________________________________________________________ Quick shot log 01-LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.06, NL04=0.65, no probes scanning 02-LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.1, NL04=0.81, SP @ 0.6, 1.0, 1.2s, ASP(+4), FSP(-8), WASP (+2 rho) 03-LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.14, NL04=0.75, SP @ 0.6, 1.05, 1.2s, ASP(+6), FSP(-5), WASP (+2 rho) 04-LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.08, NL04=0.63, SP @ 0.6, 1.05, 1.2s, ASP(+7), FSP(-3), WASP (+0 auto) 05 - power test 06-LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.06, NL04=0.62, SP @ 0.6, 0.8, 1.05s, ASP(+7), FSP(-1), WASP (+0 auto) 07-LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.24, NL04=0.8, SP @ 0.6, 0.8, 1.05s, ASP(+8), FSP(+2), WASP (+0 auto + 0.5V) 08-LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.25, NL04=0.85, SP @ 0.6, 0.8, 1.05s, ASP(+8.5), FSP(+3), WASP (+0 auto + 0.5V) 09-LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.1, NL04=0.62, SP @ 0.6, 0.8, 1.05s, ASP(+8.5), FSP(+3), WASP (+0 auto + 0.5V) 10-LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.03, NL04=0.54, SP @ 0.6, 0.8, 1.05s, ASP(+8.5), FSP(+3), WASP (+0 auto + 0.5V) third scan in H-mode 11-LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.15, NL04=0.62, SP @ 0.6, 0.8, 1.05s, ASP(+8.5), FSP(+3), WASP (+0 auto + 0.5V) nice data, go to single scan during H-mode 12-LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.125, NL04=0.64, SP @ 1.18s, ASP(+8.5), FSP(+3), WASP (+0 auto + 0.5V) ASP not deep enough, FSP too deep. 13-LSN, Ip=0.8, Bt=5.4-2.8, first L-H @ 1.02, NL04=0.67, SP @ 1.18s, ASP(+9), FSP(+1), WASP (+0 auto + 0.5V) EFH scan. ASP - excellent, FSP not deep enough. 14-LSN, Ip=0.8, Bt=5.4-2.8, first L-H @ 1.12, NL04=0.6, SP @ 1.18s, ASP(+9), FSP(+2), WASP (+0 auto + 0.5V) scan during H->L. FSP catches H going in, L coming out. 15-LSN, Ip=0.8, Bt=5.4-2.8, first L-H @ 1.13, NL04=0.6, SP @ 1.18s, ASP(+9), FSP(+2), WASP (+0 auto + 0.5V) scan during EFH. Nice data on FSP. ASP not deep enough. 16-LSN, Ip=0.8, Bt=5.4-2.8, first L-H @ 1.12, NL04=0.6, SP @ 1.18s, ASP(+10), FSP(+3), WASP (+0 auto + 0.5V) scan in EFH. ASP & FSP data look good. 17-LSN, Ip=0.8, Bt=5.4-2.8, first L-H @ 1.11, NL04=0.65, SP @ 1.16s, ASP(+10), FSP(+3), WASP (+0 auto + 0.5V) scan in EFH. ASP & FSP data look good. 18-USN, Ip=0.8, Bt=5.4-3.3 disrupts at 0.94 19-USN, Ip=0.8, Bt=5.4-3.5 disrupts at 0.86 20-USN, Ip=0.8, Bt=5.4-3.3 disrupts at 0.925 21-USN, Ip=0.8, Bt=5.4-2.9 disrupts at 1.08 22-USN, Ip=0.8, Bt=5.4-3.4 disrupts at 1.08 23-no power 24-power supply dud 25-USN, Ip=0.8, Bt=5.4-3.4 disrupts at .894 Punt on USN. go to LSN at 0.6 MA 26-LSN, Ip=0.6, drooping to 0.58, Bt=5.4-2.2, NL04=0.6, no probes scanning. no H-mode 27-LSN, Ip=0.6, Bt=5.4-2.2, first L-H @ 1.2 (q=2.6) NL04=0.55, SP @ 0.6, 1.0, 1.4s, ASP(+8), FSP(+0), WASP (+0 auto + 0.5V) Last scan in EFH 28-LSN, Ip=0.6, Bt=5.4-2.2, first L-H @ 1.12, NL04=0.47, SP @ 0.6, 0.8, 1.05s, ASP(+9.5), FSP(+3), WASP (+0 auto + 0.5V) ASP ok, could be deeper. FSP not deep enough. 29-LSN, Ip=0.6, Bt=5.4-2.2, first L-H @1.2, NL04=0.54, SP @ 0.6, 0.8, 1.05s, ASP(+11), FSP(+6), WASP (+0 auto + 0.5V) ASP a bit deep. FSP not deep enough. 30-LSN, Ip=0.6, Bt=5.4-2.2, first L-H @1.1, NL04=0.5, SP @ 0.6, 0.8, 1.05s, ASP(+10.5), FSP(+7.5), WASP (+0 auto + 0.5V) Nice data on ASP and FSP 31-LSN, Ip=1.2, Bt=5.9-4.9, first L-H @0.97 (q=2.9) NL04=0.91, no probes scanning, disrupted at 1.5 s 32 - fizzle 33-LSN, Ip=1.2, Bt=5.9-4.5, first L-H @1.05, NL04=0.81, SP @ 0.6, 0.8, 0.95s, ASP(+8), FSP(-3), WASP (+0 auto) ASP ok. FSP could be deeper. 34-LSN, Ip=1.2, Bt=5.9-4.5, first L-H @1.05, NL04=0.81, SP @ 0.6, 0.8, 1.00s, ASP(+8), FSP(+0), WASP (+0 auto) Excellent data on ASP, FSP and WASP (even the SW electrode on the wasp was working!)

Physics Operator Summaries

Entered: Jan 24 2008 07:06:17:070PM

Author: Earl Marmar

This was a good run from the physop point of view. Initiation was reliable. Two shots were lost to engineering problems. In one case nothing fired (shot 23), attributed to an iogr problem. The following shot was missing several power supplies. There was also an event at the end of shot 4, when EF3 turned back on at 4.5 seconds and then the breaker pulled. This was followed by a successful EF3-only test. Lower Single Null ohmic h-modes were explored at 600, 800 and 1200 kA. The attempts to get USN with toroidal field rampdowns in the up-down mirror shape were not successful, resulting in a series of shots that disrupted around 1 second. Steve Wolfe pointed out that these had outer strike point on the pumping slots, which might have caused a power handling issue, but this is unclear. Scorecard: Plasmas 30 fizzle 1 power supply dud 1 no power shot 1 test 1 Total cycles 34

Session Leader Comments
Jan 24 2008 09:32:18:457AM	1080124001	Brian Labombard	001 LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.06, NL04=0.65, no probes scanning Repeat with probes, NINJA, argon, and Li pellet at 1.5s
Jan 24 2008 09:54:24:013AM	1080124002	Brian Labombard	002 LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.1, NL04=0.81, SP @ 0.6, 1.0, 1.2s, ASP(+4), FSP(-8), WASP (+2 rho) Repeat
Jan 24 2008 10:41:51:223AM	1080124003	Brian Labombard	003 LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.14, NL04=0.75, SP @ 0.6, 1.0, 1.2s, ASP(+6), FSP(-5), WASP (+2 rho) repeat with probes deeper, lower density.
Jan 24 2008 10:45:29:807AM	1080124004	Brian Labombard	004 LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.08, NL04=0.63, SP @ 0.6, 1.05, 1.2s, ASP(+7), FSP(-3), WASP (+0 auto)
Jan 24 2008 11:04:22:280AM	1080124006	Brian Labombard	06-LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.06, NL04=0.62, SP @ 0.6, 0.8, 1.05s, ASP(+7), FSP(-1), WASP (+0 auto)
Jan 24 2008 11:13:28:057AM	1080124007	Brian Labombard	07-LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.24, NL04=0.8, SP @ 0.6, 0.8, 1.05s, ASP(+8), FSP(+2), WASP (+0 auto + 0.5V)
Jan 24 2008 11:27:52:043AM	1080124008	Brian Labombard	08-LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.25, NL04=0.85, SP @ 0.6, 0.8, 1.05s, ASP(+8.5), FSP(+3), WASP (+0 auto + 0.5V)
Jan 24 2008 11:53:13:180AM	1080124009	Brian Labombard	09-LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.1, NL04=0.62, SP @ 0.6, 0.8, 1.05s, ASP(+8.5), FSP(+3), WASP (+0 auto + 0.5V)
Jan 24 2008 12:02:07:787PM	1080124010	Brian Labombard	10-LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.03, NL04=0.54, SP @ 0.6, 0.8, 1.05s, ASP(+8.5), FSP(+3), WASP (+0 auto + 0.5V) third scan in H-mode
Jan 24 2008 12:34:07:557PM	1080124012	Brian Labombard	12-LSN, Ip=0.8, Bt=5.4-2.8, L-H @ 1.125, NL04=0.64, SP @ 1.18s, ASP(+8.5), FSP(+3), WASP (+0 auto + 0.5V) Scan is during H-mode. FSP is too deep, ASP is not deep enough Try again
Jan 24 2008 12:49:40:933PM	1080124013	Brian Labombard	13-LSN, Ip=0.8, Bt=5.4-2.8, first L-H @ 1.02, NL04=0.67, SP @ 1.18s, ASP(+9), FSP(+1), WASP (+0 auto + 0.5V) EFH scan. ASP - excellent, FSP not deep enough.
Jan 24 2008 12:54:37:347PM	1080124014	Brian Labombard	14-LSN, Ip=0.8, Bt=5.4-2.8, first L-H @ 1.12, NL04=0.6, SP @ 1.18s, ASP(+9), FSP(+2), WASP (+0 auto + 0.5V) scan during H->L. FSP catches H going in, L coming out.
Jan 24 2008 01:19:54:860PM	1080124015	Brian Labombard	15-LSN, Ip=0.8, Bt=5.4-2.8, first L-H @ 1.13, NL04=0.6, SP @ 1.18s, ASP(+9), FSP(+2), WASP (+0 auto + 0.5V) scan during EFH. Nice data on FSP. ASP not deep enough.
Jan 24 2008 01:20:15:830PM	1080124016	Brian Labombard	16-LSN, Ip=0.8, Bt=5.4-2.8, first L-H @ 1.12, NL04=0.6, SP @ 1.18s, ASP(+10), FSP(+3), WASP (+0 auto + 0.5V) scan in EFH. ASP & FSP data look good.
Jan 24 2008 01:35:09:610PM	1080124017	Brian Labombard	17-LSN, Ip=0.8, Bt=5.4-2.8, first L-H @ 1.11, NL04=0.65, SP @ 1.16s, ASP(+10), FSP(+3), WASP (+0 auto + 0.5V) scan in EFH. ASP & FSP data look good. go to USN next.
Jan 24 2008 03:58:01:853PM	1080124026	Brian Labombard	26-LSN, Ip=0.6, drooping to 0.58, Bt=5.4-2.2, NL04=0.6, no probes scanning. no H-mode
Jan 24 2008 03:59:24:917PM	1080124027	Brian Labombard	27-LSN, Ip=0.6, Bt=5.4-2.2, first L-H @ 1.2 (q=2.6) NL04=0.55, SP @ 0.6, 1.0, 1.4s, ASP(+8), FSP(+0), WASP (+0 auto + 0.5V) Last scan in EFH
Jan 24 2008 03:59:39:743PM	1080124028	Brian Labombard	28-LSN, Ip=0.6, Bt=5.4-2.2, first L-H @ 1.12, NL04=0.47, SP @ 0.6, 0.8, 1.05s, ASP(+9.5), FSP(+3), WASP (+0 auto + 0.5V) ASP ok, could be deeper. FSP not deep enough.
Jan 24 2008 04:16:30:733PM	1080124029	Brian Labombard	29-LSN, Ip=0.6, Bt=5.4-2.2, first L-H @1.2, NL04=0.54, SP @ 0.6, 0.8, 1.05s, ASP(+11), FSP(+6), WASP (+0 auto + 0.5V) ASP a bit deep. FSP not deep enough.
Jan 24 2008 04:46:58:050PM	1080124030	Brian Labombard	30-LSN, Ip=0.6, Bt=5.4-2.2, first L-H @1.1, NL04=0.5, SP @ 0.6, 0.8, 1.05s, ASP(+10.5), FSP(+7.5), WASP (+0 auto + 0.5V) Nice data on ASP and FSP
Jan 24 2008 04:49:08:240PM	1080124031	Brian Labombard	31-LSN, Ip=1.2, Bt=5.9-4.9, first L-H @0.97 (q=2.9), NL04=0.91, no probes scanning, disrupted at 1.5 s
Jan 24 2008 06:23:47:990PM	1080124033	Brian Labombard	33-LSN, Ip=1.2, Bt=5.9-4.5, first L-H @1.05, NL04=0.81, SP @ 0.6, 0.8, 0.95s, ASP(+8), FSP(-3), WASP (+0 auto) ASP ok. FSP could be deeper.
Jan 24 2008 06:23:36:300PM	1080124034	Brian Labombard	34-LSN, Ip=1.2, Bt=5.9-4.5, first L-H @1.05, NL04=0.81, SP @ 0.6, 0.8, 1.00s, ASP(+8), FSP(+0), WASP (+0 auto) Excellent data on ASP, FSP and WASP (even the SW electrode on the wasp was working!)

Physics Operator Comments
Jan 24 2008 09:20:05:100AM	1080124001	Earl Marmar	slight delay in the start of the run TF cooling on one leg is lagging; should be ready soon
Jan 24 2008 09:30:59:580AM	1080124001	Earl Marmar	load from 1070710012 (ohmic H-mode, with TF decrease starting at .3 s) call all magnetics predictors in segments 2, 3 and 4 import segment 1 from 1080123030 into segment 1 plasma startup had a bounce to the outside 4 ohmic H-modes (all ELM-free)
Jan 24 2008 09:41:08:170AM	1080124002	Earl Marmar	argon enabled, 75 msec puff starting at .325 Ninja also puffing LPI after 1.5 s plasma better startup very similar H-modes (4, ELM-free) post-LPI disruption at 1.52 s
Jan 24 2008 10:33:20:853AM	1080124003	Earl Marmar	argon puff to 100 msec, starting at 0.3 s plasma first H-mode is a bit later post-LPI disruption
Jan 24 2008 10:27:12:160AM	1080124004	Earl Marmar	nl_04 target to .6e20 (from .65e20) plasma first H-mode a little earlier post-LPI disruption EF3 came back on after 4.5 seconds, then the EF3 breaker pulled expect a delay while the engineers investigate
Jan 24 2008 10:41:35:723AM	1080124005	Earl Marmar	EF3 test under PLC control
Jan 24 2008 11:04:38:983AM	1080124006	Earl Marmar	repeat plasma no LPI
Jan 24 2008 11:11:00:993AM	1080124007	Earl Marmar	added early ninja puff plasma higher density; first H-mode delayed
Jan 24 2008 11:26:49:540AM	1080124008	Earl Marmar	turn off early ninja puff plasma density intermediate between those from shots 6 and 7 first H-mode still later than we would like
Jan 24 2008 11:39:07:850AM	1080124009	Earl Marmar	nl_04 target to 5e19 (from 6e19) plasma first H-mode is earlier
Jan 24 2008 12:13:24:800PM	1080124010	Earl Marmar	nl_04 target to 5.8e19 plasma survives the Li pellet
Jan 24 2008 12:13:13:657PM	1080124011	Earl Marmar	no pcs changes plasma survives the Li pellet
Jan 24 2008 12:39:50:797PM	1080124012	Earl Marmar	no pcs changes plasma
Jan 24 2008 12:39:40:563PM	1080124013	Earl Marmar	no pcs changes plasma
Jan 24 2008 01:09:38:240PM	1080124014	Earl Marmar	no pcs changes plasma
Jan 24 2008 01:09:48:690PM	1080124015	Earl Marmar	no pcs changes plasma
Jan 24 2008 01:08:52:783PM	1080124016	Earl Marmar	no pcs changes plasma
Jan 24 2008 01:23:33:190PM	1080124017	Earl Marmar	no pcs changes plasma
Jan 24 2008 01:47:53:887PM	1080124018	Earl Marmar	go to USN import 1071220010 segment 3 into segment 3 nl_04 target to 5.8e19 copy TF current waveform from shot 17 (ramp-down starting at .3 seconds) plasma lots of early MHD disrupt 0.9s (locked?)
Jan 24 2008 02:00:13:773PM	1080124019	Earl Marmar	slow the early density rise, nl_04 target to 5.519 plasma disrupts a little earlier
Jan 24 2008 02:22:32:743PM	1080124020	Earl Marmar	ZCUR TO +.004 (from 0) nl_04 target to 5.9e19 plasma still disrupting before 1 second
Jan 24 2008 02:33:44:740PM	1080124021	Earl Marmar	nl_04 target to 7e19 plasma lasted a little longer
Jan 24 2008 03:23:04:720PM	1080124022	Earl Marmar	nl_04 target to 6e19 ramp TF down a little less (to 90 kA) disable argon plasma similar disruption time
Jan 24 2008 02:53:01:200PM	1080124023	Earl Marmar	start TF increase at .95 s (after rampdown) no power; problem with iogr
Jan 24 2008 03:03:42:883PM	1080124024	Earl Marmar	try again TF re-ramp starting at .95 s power supply dud no OH1, no EF1
Jan 24 2008 03:22:30:513PM	1080124025	Earl Marmar	once more, with feeling TF re-ramp starting at .95 s plasma no improvement, disrupt at .95 s
Jan 24 2008 03:23:25:530PM	1080124026	Earl Marmar	back to lower single null segment 3 off segment 2 on Ip to 600 kA TF rampdown to 55kA, starting at .25s enable argon (100 msec, starting at .3 s)
Jan 24 2008 03:57:09:133PM	1080124027	Earl Marmar	nl_04 target to 5e19 TF rampdown to 55kA, starting at .2s program a slight ramp-up in Ip (to compensate a droop on shot 26) plasma 7 H-modes (ELM-free)
Jan 24 2008 03:57:24:540PM	1080124028	Earl Marmar	no pcs changes plasma density is a bit lower 10 short H-modes
Jan 24 2008 04:31:40:953PM	1080124029	Earl Marmar	no pcs changes plasma
Jan 24 2008 04:32:11:330PM	1080124030	Earl Marmar	no pcs changes plasma
Jan 24 2008 04:47:31:470PM	1080124031	Earl Marmar	1.2 MA TF ramp up to 6 T, then down to 4.9 T nl_04 target to 8e19 plasma got h-modes disrupt just before 1.5 s hit various supply PLC limits
Jan 24 2008 04:47:06:017PM	1080124032	Earl Marmar	reduce prefill to 20 msec (from 24) nl_04 target to 7e19 increase OH1 and EF3 PLC limits modify TF ramp (start down from 6 T at 0.5 s, go lower) start Ip rampdown at 1.4 s fizzle
Jan 24 2008 05:18:27:303PM	1080124033	Earl Marmar	no additional PCS changes plasma multiple h-modes ramped down to 700 kA, then disrupted Power supplies look like they stayed within limits
Jan 24 2008 05:19:27:633PM	1080124034	Earl Marmar	no additional PCS changes plasma multiple h-modes peaks up nicely after the pellet (which was injected into H-mode), then disrupts

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:20:38:303AM	Plasma	Ok
2	09:33:43:210AM	Plasma	Ok
3	09:54:19:450AM	Plasma	Ok
4	10:12:20:110AM	Plasma	Ok	EF3 & UPS fault right after the shot
5	10:38:56:707AM	Test	Ok	EF3 PLC test
6	10:50:37:920AM	Plasma	Ok
7	11:03:02:343AM	Plasma	Ok
8	11:16:13:670AM	Plasma	Ok
9	11:30:28:843AM	Plasma	Ok
10	11:43:11:840AM	Plasma	Ok
11	11:56:30:387AM	Plasma	Ok
12	12:12:27:423PM	Plasma	Ok
13	12:28:44:380PM	Plasma	Ok
14	12:41:18:690PM	Plasma	Ok
15	12:54:01:657PM	Plasma	Ok
16	01:06:20:500PM	Plasma	Ok
17	01:18:49:153PM	Plasma	Ok
18	01:33:21:017PM	Plasma	Ok
19	01:47:45:910PM	Plasma	Ok
20	02:00:13:523PM	Plasma	Ok
21	02:21:54:257PM	Plasma	Ok
22	02:34:21:147PM	Plasma	Ok
23	02:46:54:880PM	Plasma	Ok
24	02:58:31:283PM	Plasma	Bad	EF1 and OH1 didn't fire.
25	03:10:57:877PM	Plasma	Ok
26	03:23:31:127PM	Plasma	Ok
27	03:36:16:827PM	Plasma	Ok
28	03:48:44:513PM	Plasma	Ok
29	04:01:45:170PM	Plasma	Ok
30	04:14:17:027PM	Plasma	Ok
31	04:30:30:077PM	Plasma	Ok
32	04:44:07:827PM	Plasma	Ok
33	04:56:30:373PM	Plasma	Ok
34	05:08:50:950PM	Plasma	Ok

System Availability

Jan 24 2008 09:20:15:270AM

System Available Comment Availability Changed Owner Description Who Can Change Active MHD yes Fully operational Mar 28 2007 09:19PM (sears) Joe Snipes Active MHD Antenna sears,snipes BES yes vertical array of six views at R ~ 87.3 cm, radial array of three views out to R ~ 89 cm, both at outboard midplane. Three discrete fiber views of beam at R ~ 70.0, 76.5 and 82.5 cm. Feb 06 2007 10:00AM (bravenec) Ron Bravenec Beam Emission Spectroscopy bravenec,rowan Bolometers yes Diode 2pi working fine, foil 2pi being low-pass filtered to remove noise. Outboard miidplane AXUV fine. Midplane foils working fine, but need to fill tree with calibrations. 2D AXUV arrays are being digitized but need further debugging and calibration. Dec 19 2007 07:16PM (mlreinke) Matt Reinke Bolometers hutch,mlreinke Boronization no First Boronization 5/9/07 Bottle has been removed from the cell Sep 14 2007 12:42PM (dekow) Jim Irby Boronization dekow,irby CNPA yes Single channel CNPA available as of 12/1707 Dec 17 2007 05:48PM (parker) Ron Parker Compact Neutral Analyzer parker Cryopump - Upper Divertor yes Cryopump is operational Dec 11 2007 10:13AM (labombard) Brian LaBombard Upper Divertor Cryopump irby,labombard CXRS yes The pedestal toroidal array was installed, spatially and absolutely calibrated. There are 10 chords intersect the beam at the major_R_range=[74.2:86.3]cm. Spatial resolution: 1.2 cm. The F-top poloidal array was installed and spatially calibrated. There are 19 chords intersect the beam at the major_R_range=[67.8:91.0]cm. Spatial resolution: 1.22 cm. Nov 27 2007 10:21AM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,rachmcd,rowan D Alpha yes \ha2_bright and \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 are available Nov 26 2007 04:23PM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe Dalsa yes optics repaired, camera re-installed, and view has been re-calibrated Nov 27 2007 09:54AM (marmar) Earl Marmar Visible Bremsstrahlung marmar Disruption Mitigation no   Nov 20 2007 10:47PM (granetz) Robert Granetz Gas Jet granetz,whyte Divertor IR no   Mar 06 2007 10:50AM  Glen Wurden Divertor IR Digital Video gwurden,terry Divertor IR Spectroscopy no   Mar 06 2007 10:51AM  Glen Wurden Divertor IR Spectroscopy gwurden,terry DNB no   Nov 20 2007 10:47PM (granetz) Robert Granetz Diagnostic Neutral Beam beals,granetz FRC-ECE no Problem with LO's Jan 10 2008 01:17PM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips G-Side Ratiomatic yes Gauge is operational and calibrated against G-side MKS on shot#1071127002 Nov 27 2007 01:25PM (labombard) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland GPC yes All 9 channels operational as of new year. Jan 03 2008 09:31AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt GPC2 yes Most channels operational. Jan 02 2008 12:22PM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt GPI no Neither the Xpt-view nor the midplane-view camera is operational. Nov 26 2007 04:25PM (terry) Jim Terry Gas Puff Imaging terry,zweben H/D yes Should be operational for the FY08 campaign Nov 27 2007 09:54AM (marmar) Earl Marmar H/D Ratio marmar Hirex Jr yes   Mar 06 2007 08:59AM (rice) John Rice High Resolution X-Ray ince,rice Hirex Sr no Be Window has a leak and so the gate valve is closed Nov 23 2007 12:50PM (ince) John Rice High Resolution X-Ray ince,rice HXR yes Something might be wrong with channel 26; all others working fine. Mar 23 2007 10:43AM (schmidt) Ron Parker Hard X-Ray Array parker,schmidt ICRF D-Antenna yes available (quarter-wave transformer for pre-matching) Dec 11 2007 09:01AM (ylin) Steve Wukitch D-port antenna wukitch,ylin ICRF E-Antenna yes available (with FFT for automatical matching) Dec 11 2007 09:01AM (ylin) Steve Wukitch E-port antenna wukitch,ylin ICRF J-Antenna yes normally in [0,pi,pi,0] phase for heating. current drive phase available if requested. Dec 11 2007 09:03AM (ylin) Steve Wukitch J-port antenna wukitch,ylin Lower Hybrid yes Body I Fault Circuits Repaired and tested. High power tests completed Dec 05 2007 06:40PM (dterry) Ron Parker Lower Hybrid dterry,parker LPI yes 1/9/08 Jan 09 2008 03:23PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar Ly-alpha yes Midplane working fine, emissivity profiles being stored in tree, but still need to apply in-vessel calibrations to data. WB1-LY being digitized, but not processed in tree. Dec 09 2007 06:53PM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke McPherson yes Working fine. Nov 29 2007 01:36PM (mlreinke) Jim Terry VUV Spectrometer mlreinke,terry Michelson yes Working, moderate speed for now. Jan 02 2008 01:19PM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt MKS yes E-Top, E-Bottom, F-top (cryo), G-side, and B-bottom are operational. F-top gauge has a 'sniffer tube' to measure pressures in cryopump gas box. Mar 20 2007 06:42PM (g) Brian LaBombard Baratron pressure gauges labombard MLP no Initial tests on the A-port scanning probe went well. We need to take care of some control glitches that caused some component failures. May 30 2007 08:01PM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard MSE no We are basically awaiting the DNB & its new aperture. MSE itself is OK. 5 photo detectors have been shipped out for repair, so currently only 5 channels are available. We expect the full channels will be available late in Jan 08. Jan 04 2008 01:11PM (jinseok) Steve Scott Motional Stark Effect jinseok,sscott Neutrons yes Voltage is on for the He3 bank. Voltage will be turned on for the global system at the first plasma attempts. Nov 26 2007 08:31AM (fiore) Catherine Fiore Neutron Detectors fiore Neuts and Hards yes calibration unchanged from 2007 campaign Dec 04 2007 08:56PM (irby) Jim Irby X-Ray/Neutron Detector at K-Hor irby NINJA yes All capillaries displayed by the NINJA_CONTROL GUI have been tested. Nov 26 2007 04:26PM (terry) Brian LaBombard NINJA gas puff labombard,terry PCI no Both CO2 and HeNe Lasers are disabled----- safe for machine entry. Sep 14 2007 03:21PM (lianglin) Miklos Porkolab Phase Contrast Imaging edlund,lianglin,ntsujii,porkolab Penning Gauges yes All gauges except B_DivL are operating Nov 27 2007 01:31PM (labombard) Brian LaBombard Penning Ionization Gauges labombard Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational. Nov 26 2007 04:27PM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe Polarimeter no Safe for Machine Entry Sep 14 2007 12:17PM (irby) Jim Irby C-Mod Polarimeter irby Probe Array - ISD yes Operational Nov 27 2007 01:40PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard Probe Array - LH yes Operational Nov 27 2007 01:40PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard Probe Array - OSD yes Operational Nov 27 2007 01:41PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard Probe Array - UDIV yes Operational Nov 27 2007 01:41PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard Reflectometer yes 50, 60, 75 and 88GHz channels are connected and being tested for the campaign Dec 18 2007 10:28AM (dominguez) Earl Marmar Reflectometer dominguez,marmar Scanning Probe - ASP yes Operational, but needs to be checked with plasma. Nov 27 2007 01:45PM (labombard) Brian LaBombard A-Port Scanning Probe labombard Scanning Probe - FSP yes FSP is operational Dec 11 2007 10:13AM (labombard) Brian LaBombard F-Port Scanning Probe labombard Scanning Probe - WASP yes A- and K-port WASP electrodes have been replaced/tested. Nov 27 2007 01:44PM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick TCI yes CO2 Laser is on --- initial alignment complete Nov 16 2007 01:23PM (irby) Jim Irby Two-Color Interferometer irby,murray TS - Core yes 8 polychromators, 1 laser. Density is calibrated for YAG2. YAG1 is not calibrated yet. Jan 17 2008 11:51PM (yma) Jerry Hughes Core Thomson scattering jwhughes,yma TS - Edge yes System is working. Density is derived with last year's calibration, and should be good to within ~20%. Jan 18 2008 07:27AM (jwhughes) Jerry Hughes Millimeter resolution edge Thomson scattering jwhughes,yma Vispec no 350 and 670 nm, 4 spatial channels Nov 28 2007 09:58AM (agraf) Alex Graf Visible Spectrometer agraf XTOMO yes system operational Jan 10 2008 11:41AM (mlreinke) Bob Granetz X-Ray Tomography granetz,mlreinke