| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Yuichi Takase |
| Physics operator(s): | Joseph Snipes |
| Engineering operator(s): | Vinny Bertolino,Joe Daigle |
| Engineering Operator Run Comment |
| H-mode |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:14:430PM |
| Author: To Be Determined |
| Run Summary 951206 SL: Takase PO: Snipes EO: Daigle/bertolino Run Plan for 951206: ------------------- The objective is to optimize H-mode performance, primarily in the H-factor (confinement enhancement relative to L-mode) and secondarily in H-mode duration. Considerable progress has already been made during the 951205 run, after completing the position feedback mini-proposal ahead of schedule. It was demonstrated that both high starting density and active gas-puffing during H-mode were beneficial. The position feedback was not able to maintain constant loading, but appeared to help prevent RF trip-outs to some degree. The plan is to start from 951205039 and continue exploratory investigation. Possibilities include: X-point (or more precisely strike point) scan Outer gap scan (using position feedback offset) I_p scan Use of pellet fuelling Results: ------- The "D-port" transmitter plate voltage was reduced last night to avoid crowbars which have been occurring on practically all high power rf pulses. This has solved the problem of crowbars, but it means we will not get as high a power from this transmitter. Frequent "overloads" were still observed causing transmitter trips, but these faults are less damaging to the transmitter. The plan is to disassemble and inspect the final cavity over the weekend (through Monday). The plasma position feedback worked fairly well, but as noted yesterday plasma excursion away from the antenna must be limited. This limit will be incorporated before next week. We started the run by reproducing a quasi-steady-state ELMy discharge (shots 29 and 39 from yesterday, for example). This was accomplished early in the run (shots 5 and 6, for example), and was used as the baseline for further optimization. We have confirmed again that "grassy ELM"-type discharges can be reproduced reliably with high initial density and active gas-puffing during the RF pulse. The first attempt at the fiducial shot was a fizzle. RF ran well (1MW each from D and E) on the fiducial shot (shot 11), but no H-mode was observed with 2MW of RF power (usually we get H-mode with only 1MW of RF power). The strike point was moved by programming RXL and ZXL. Initial indications are that moving the X-point up and out (which does raise the strike point) and moving the X-point down and out (which did not really lower the strike point, rather the separatrix below the X-point got stretched apart, and the strike point was about half way up the outer vertical plate) did not improve the H-mode performance. An attempt was made to use STRKPSI control to really get the strike point lower was unsuccessful, and was abandoned for today we (really Steve Wolfe) didn't understand why it didn't work. Both lower and higher currents (0.6 and 1.0MA instead of the 0.8MW baseline) plasmas were produced, but there were no obvious improvements in the H-factor. The outer gap was varied somewhat by programming a higher target value for loading on position feedback (main reason was to avoid pushing the plasma away from the antenna when the loading got too high). No systematic study could be carried out, but no indication of improvement was observed. Finally, we tried to inject Li pellet (D2 pellet was not available today) prior to RF. Some encouraging signs were observed, but a clean shot could not be taken. This was partly because we had to turn off the radial position feedback for combined pellet-RF shots. Although some important information was obtained during this run, it would be desirable to repeat the "low outer strike-point" shot with STRKPSI control. Combination of pellet (either Li or D2) clearly needs some more work. Shot 01 dud (PS) 02 pla early disruption @ .65sec (too much gas) 03 pla load 951205039, reduce gas, 800kA, nel=1.2->2.3, 2.7MW, 110kJ 04 pla similar to 951205029, RF cutting off @ 0.9sec 05 pla RF still cutting off @ .9sec 06 pla extended RF gate 07 pla D-port tripped early, disrupt @ .92sec 08 pla loading target value increased, early disruption @ .25s (PS), lost TCI 09 pla fiducial (didn't load fiducial shot) 10 fiz retake fiducial (loaded 951205025) 11 pla fiducial shot (no H-mode with 2MW RF!) 12 pla early disruption 13 pla reload 951206005, D-port a little short 14 pla RXL 1cm out, ZXL 1cm up, D-port interrupts 15 pla good shot, 2.8MW, 105kJ, strike points just below the nose high divertor D_alpha level 16 pla RXL back in 1cm, ZXL down 2cm, not very good (similar to 15) 17 pla RXL 0.5cm out, ZXL 0.5cm down, much worse, only 85kJ outer strike point is half way up the vertical plate 18 pla reload 951206013, disrupt @ .53sec 19 pla loaded 950131011 STRKPSI control, early disruption @ .22sec trying to get slot divertor (i.e., very low strike point) 20 pla disrupt @ .51sec (right after STRKPSI control turns on) 21 pla reload 951206018, good shot, some E-port trip-outs 22 pla 600kA, nel=0.8->1.6, 28->87kJ 23 pla higher dens., nel=1.0->1.9, 28->86kJ 24 pla still higher dens., short D-port 25 pla 1MA, E-port tripped early, nel=1.0->2.1, 100kJ/2.5MW=40msec 26 pla higher dens. lost TCI (get lower dens), DAQ1 errors, short E-port 27 pla higher dens. nel=1.1->2.6, 131kJ 28 pla more gas, nel=1.2->2.7, 130kJ 29 pla add D2 puff from B-side-upper (didn't load into model?) nel=1.1->2.6, 134kJ 30 pla repeat, add D2 puff from B-side-upper (didn't get higher dens) short D-port pulse 31 pla got linear dens rise to nel=2.4, but no RF 32 fiz remove extra gas, Li pellet @.58sec 33 pla Li pellet @ .57sec, disrupt @ .72sec, H-mode, no PEP 34 pla Li pellet @ .57sec, disrupt @ .68sec, PEP (5e13 neuts/sec), no H-mode 35 pla turned off position feedback no pellet, got H-mode, short D-port 36 pla got pellet, D-port tripped early, PEP, no H-mode 37 pla disruption @ .22sec, runaway shot 38 pla over-gassed, disrupt @ .46sec 39 pla disrupt @.41sec 40 pla reload 951206036 41 fiz remove extra gas after RF turn-on |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:55:503PM |
| Author: To Be Determined |
| ICRF H-mode Run 951206 Engineer in Charge: Vince Bertolino Physicist in Charge: Joseph Snipes Session Leader: Yuichi Takase Goal: To improve the ICRF H-mode with high ICRF power (3 MW). We will attempt to improve the H-mode by moving the lower X point up and down and vary the gas feed and density programming. We succeeded in getting a number of ELMy H-modes today with up to 3 MW of ICRF power. However, the H factors have not improved with values of about 1.4 today. Nonetheless, some long ELMy H-modes were obtained with 300 msec durations. Higher gas puffing, allowed increased length of the H-modes because the RF coupling resistance remained constant with the radial feedback. But, the H-modes were ELMy. Raising or lowering the position of the X point seemed to make the H-modes worse. This may be a conditioning issue in the new location. Another thing worth trying is to have strike point control. It was attempted for a few shots, but they led to disruptions as soon as the STRKPSI control was turned on. Several nice 1 MA H-modes were obtained. However, disruptions were rampant. Almost all discharges disrupted with significant current. Some work still needs to be done to ramp down a high density discharge without disrupting. Several lithium pellets were also injected prior to RF and some short PEP/H-modes were obtained. However, they disrupted violently apparently due to an interaction between the RF radial position feedback and the pellet. There was one magnet resistance fault on shot 1 and an OH2 fault on shot 8, but otherwise, the engineering systems worked well. There were, however, several, unexplained early disruptions and a couple of runaway shots. Overall, the run was reasonably successful, though H-modes were not improved. Scorecard: 41 shots, 37 plasmas, 3 fizzles, 1 magnet resistance fault Shot 1 : Start with shot 951205043 with Br offset set to 7.5 mT. No TF. Magnet resistance fault. Shot 2 : Added 1 ms to the pre-puff. Got plasma, but too much gas. Disrupted at 0.62 sec. Shot 3 : Copied shot 951205039, but reduced the gas early and throughout the pulse. Set the pre-RF density to 1.4 x 10^20 m^-3. Br offset set to 7.5 mT. Ip set to 0.8 MA. Short H-mode. Disrupted at 1.2 sec. Shot 4 : Increased ramp of RCUR and CLEARIN during rampdown to bring the plasma against the inner wall to pump out the density. Still disrupted at 1.14 sec. H-mode 0.6 - 0.9 sec. Shot 5 : Increased ramp of RCUR and CLEARIN during rampdown to bring the plasma against the inner wall to pump out the density. H-mode from 0.6 - 0.9 sec. Disrupted at 1.26 sec. Shot 6 : Increased ramp of RCUR and CLEARIN during rampdown to bring the plasma against the inner wall to pump out the density. H-mode from 0.66 - 0.87 sec. Disrupted at 1.15 sec. Shot 7 : Set RXL gain to 18 from 1 to 1.4 sec to try to keep the strike point from crawling up the inner nose during rampdown. Disrupted violently at 0.92 sec apparently due to the RF radial position feedback causing a vertical instability. It disrupted up. Shot 8 : Golovato reduced the feedback loading resistance. Plasma disrupted at 0.25 sec. OH2L fault. Interferometer died as well. Shot 9 : Repeat. Disrupted at 0.96 sec. Shot 10: Copied shot 951205025. Fiducial. Fizzle! Shot 11: Fiducial. Changed pre-puff to 13 ms flattop and Br offset to 7.5 mT. Good fiducial. Wall conditions look pretty bad. No H-mode. Disrupted at 1.2 sec. Shot 12: Loaded shot 951206005. Hard x rays from 0.03 sec. Disrupted at 0.23 sec. Shot 13: Increased early gas a bit between 0.01 and 0.1 sec. Good shot. H-mode from 0.66 - 0.76 sec. Shot 14: Changed RXL and ZXL programming to move the X point up and out by 1 cm in each direction from 0.6 to 1 sec. Large density oscillations. Gas feedback unstable. Disrupted at 1.28 sec. Shot 15: Lowered nl04 request to 1.2 x 10^20 m^-2. H-mode from 0.64 - 1.01 sec. with high recycling in the divertor. Shot 16: Moved RXL back to -0.005 m and ZXL down 2 cm. ELMy H-mode from 0.68 - 0.82 sec. RF tripped at 0.82 sec to half the peak power. Shot 17: Moved RXL to 0 and ZXL down another 0.5 cm ramping from -3.2 to -3.5 cm. Some signs of H-mode from 0.62 - 0.84 sec in the divertor, but not much of a density rise. Shot 18: Increased Ar puff duration by 2 msec. Reloaded shot 951206013 Disrupted violently at 0.52 sec. Appears to be a moly UFO. Shot 19: Copied STRKPSI controllers from shot 950131011 as well as RXL and ZXL. Disrupted at 0.22 sec. STRKPSI control killed the plasma. Shot 20: Changed start time of STRKPSI controller to 0.47 sec. Disrupted at 0.5 sec. Clearly the STRKPSI controller is not working. Shot 21: Loaded shot 951206018. Good shot. H-modes from 0.65 - 0.79 sec. Shot 22: Ip set to 0.6 MA. Reduced Ar by 2 msec. Reduced density to 1 x 10^20 m^-2 with a step up to 1.5 x 10^20 m^-2. Good shot. H-modes from 0.66 - 0.98 sec. Shot 23: Increased density from 0.6 to 1 sec from 1.5 to 1.8 x 10^20 m^-2. Added gas pre-programming on A side valve. Good shot. H-mode from 0.68 - 0.96 sec. Shot 24: Raised nl04 to 1.2 x 10^20 m^-2 before the RF and then increased to 2.2 x 10^20 m^-2 during the RF. Good shot. RF tripped. Short H-mode from 0.67 to 0.7 sec. Shot 25: Raised Ip to 1 MA. Good shot. ELMy H-mode from 0.65 - 0.98 sec. Shot 26: Increased Ar puff to 22 msec duration. Increased density to 1.5 x 10^20 m^-2 before RF and up to 3 x 10^20 m^-2 during RF. Increased pre-programmed gas on A side throughout the discharge. Good shot. nl04 and density feedback failed. Shot 27: Repeat with nl04. Good shot. ELMy H-modes from 0.62 - 1.06 sec. Shot 28: Raised nl04 from 0.8 to 1 sec to 3 x 10^20 m^-2. Increased gas puffing on A side. ELMy H-mode from 0.63 - 0.9 sec. Shot 29: Turned on B side upper gas valve with deuterium at 50 V during the flattop. Good shot. H-mode from 0.64 - 0.88 sec. Shot 30: Only 1.5 MW of RF. No H-mode. Shot 31: B side upper gas set to 100 V from 0.3 to 0.45 sec, then 90 V from 0.45 to 1 sec. Good shot. Density ramps up to 2.4 x 10^20 m^-2 without RF. No H-mode. Shot 32: B side upper turned off. A side pre-programmed gas turned down to 60 V. Lithium pellet at 0.58 sec. Fizzle! Shot 33: Lithium pellet at 0.58 sec. Disrupted at 0.72 sec. Large oscillation in RCUR. Short PEP H-mode from 0.62 - 0.67 sec. Shot 34: RF radial feedback gain changed from -2750 to -2000. Li pellet at 0.58 sec. Disrupted at 0.675 sec. Short PEP mode. Shot 35: RF radial feedback turned off by Golovato. Li pellet requested at 0.58 sec. No pellet. RF tripped at 0.67 s. H-modes between 0.65 and 0.79 sec. Shot 36: One more time. Li pellet at 0.58 sec. Low RF. No H-mode. No PEP mode. Shot 37: Runaway discharge from 0.03 sec. Disrupted at 0.215 sec. Shot 38: Increased early gas puff. Still hard x rays from 0.03 sec. Disrupted at 0.46 sec. Shot 39: Increased early gas puff some more and increased pre-puff by 2 msec. Shot 40: Loaded segment 1 from shot 36. Increased pre-puff to 15 msec duration. O.K. shot. Li pellet at 0.58 sec. Disrupted at 0.835 sec. Shot 41: Fizzle! |
| Session Leader Comments | |||
| Dec 6 1995 08:36:40:080AM | Yuichi Takase | Run Plan for 951206
The objective is to optimize H-mode performance, primarily in the H-factor (confinement enhancement relative to L-mode) and secondarily in H-mode duration. Considerable progress has already been made during the 951205 run, after completing the position feedback mini-proposal ahead of schedule. It was demonstrated that both high starting density and active gas-puffing during H-mode were beneficial. The position feedback was not able to maintain constant loading, but appeared to help prevent RF trip-outs to some degree. The plan is to start from 951205039 and continue exploratory investigation. Possibilities include: X-point (or more precisely strike point) scan Outer gap scan (using position feedback offset) I_p scan Use of pellet fuelling Other suggestions will also be considered. Engineering setup as in 951205039. Fiducial will be taken mid-day if diagnostics are not ready on shot 1. | |
| Dec 6 1995 08:58:18:920AM | 951206001 | Yuichi Takase | Shot 1 dud (PS)
|
| Dec 6 1995 09:08:06:050AM | 951206002 | Yuichi Takase | Shot 2 plasma
Early disruption @ .65sec (too much gas) |
| Dec 6 1995 10:19:27:840AM | 951206003 | Yuichi Takase | Shot 3 plasma
load 951205039, reduce gas, 800kA nel=1.2->2.3, 2.7MW, 110kJ |
| Dec 6 1995 10:19:46:640AM | 951206004 | Yuichi Takase | Shot 4 plasma
similar to 951205029, RF cutting off @ 0.9sec |
| Dec 6 1995 10:20:11:170AM | 951206005 | Yuichi Takase | Shot 5 plasma
RF still cutting off @ .9sec |
| Dec 6 1995 10:20:44:790AM | 951206006 | Yuichi Takase | Shot 6 plasma
extended RF gate to 1.5sec (was .9sec) |
| Dec 6 1995 10:21:03:990AM | 951206007 | Yuichi Takase | Shot 7 plasma
D-port tripped early, disrupt @ .92sec |
| Dec 6 1995 10:33:14:000AM | 951206009 | Yuichi Takase | Shot 9 plasma
fiducial (didn't load fiducial shot) loaded 951205025 for the next shot |
| Dec 6 1995 10:34:22:440AM | 951206010 | Yuichi Takase | Shot 10 fizzle
retake fiducial (loaded 951205025) try again for the next shot |
| Dec 6 1995 11:03:19:160AM | 951206011 | Yuichi Takase | Shot 11 plasma
fiducial shot (no H-mode with 2MW RF!) |
| Dec 6 1995 11:05:08:400AM | 951206012 | Yuichi Takase | Shot 12 plasma
early disruption @ .23sec |
| Dec 6 1995 01:11:51:050PM | 951206013 | Yuichi Takase | Shot 13 plasma
reload 951206005, D-port a little short |
| Dec 6 1995 01:13:04:600PM | 951206014 | Yuichi Takase | Shot 14 plasma
RXL 1cm out, ZXL 1cm up, D-port interrupts |
| Dec 6 1995 01:13:23:670PM | 951206015 | Yuichi Takase | Shot 15 plasma
good shot, 2.8MW, 105kJ, strike points just below the nose high divertor D_alpha level |
| Dec 6 1995 01:13:40:100PM | 951206016 | Yuichi Takase | Shot 16 plasma
RXL back in 1cm, ZXL down 2cm, not very good (similar to 15) |
| Dec 6 1995 01:13:59:900PM | 951206017 | Yuichi Takase | Shot 17 plasma
RXL 0.5cm out, ZXL 0.5cm down, much worse, only 85kJ outer strike point is half way up the vertical plate |
| Dec 6 1995 01:14:17:520PM | 951206018 | Yuichi Takase | Shot 18 plasma
reload 951206013, disrupt @ .53sec |
| Dec 6 1995 01:15:04:870PM | 951206019 | Yuichi Takase | Shot 19 plasma
loaded 950131011 STRKPSI control, early disruption @ .22sec trying to get slot divertor (i.e., very low strike point) |
| Dec 6 1995 01:15:33:040PM | 951206020 | Yuichi Takase | Shot 20 plasma
disrupt @ .51sec (right after STRKPSI control turns on) |
| Dec 6 1995 01:53:25:180PM | 951206021 | Yuichi Takase | Shot 21 plasma
reload 951206018, good shot, some E-port trip-outs |
| Dec 6 1995 01:53:41:640PM | 951206022 | Yuichi Takase | Shot 22 plasma
600kA, nel=0.8->1.6, 28->87kJ |
| Dec 6 1995 01:54:10:670PM | 951206023 | Yuichi Takase | Shot 23 plasma
600kA, higher dens., nel=1.0->1.9, 28->86kJ |
| Dec 6 1995 01:54:29:850PM | 951206024 | Yuichi Takase | Shot 24 plasma
still higher dens., short D-port |
| Dec 6 1995 04:40:57:270PM | 951206025 | Yuichi Takase | Shot 25 plasma
1MA, E-port tripped early, nel=1.0->2.1, 100kJ/2.5MW=40msec |
| Dec 6 1995 04:41:13:200PM | 951206026 | Yuichi Takase | Shot 26 plasma
higher dens. lost TCI (get lower dens), DAQ1 errors, short E-port |
| Dec 6 1995 04:41:30:630PM | 951206027 | Yuichi Takase | Shot 27 plasma
higher dens. nel=1.1->2.6, 131kJ |
| Dec 6 1995 04:41:47:320PM | 951206028 | Yuichi Takase | Shot 28 plasma
more gas, nel=1.2->2.7, 130kJ |
| Dec 6 1995 04:42:09:840PM | 951206029 | Yuichi Takase | Shot 29 plasma
add D2 puff from B-side-upper (didn't load into model?) nel=1.1->2.6, 134kJ |
| Dec 6 1995 04:42:32:010PM | 951206030 | Yuichi Takase | Shot 30 plasma
repeat, add D2 puff from B-side-upper (didn't get higher dens) short D-port pulse |
| Dec 6 1995 04:42:46:720PM | 951206031 | Yuichi Takase | Shot 31 plasma
got linear dens rise to nel=2.4, but no RF |
| Dec 6 1995 04:43:10:950PM | 951206032 | Yuichi Takase | Shot 32 fizzle
remove extra gas, Li pellet @.58sec |
| Dec 6 1995 04:43:30:070PM | 951206033 | Yuichi Takase | Shot 33 plasma
Li pellet @ .57sec, disrupt @ .72sec, H-mode, no PEP |
| Dec 6 1995 04:43:46:200PM | 951206034 | Yuichi Takase | Shot 34 plasma
Li pellet @ .57sec, disrupt @ .68sec, PEP (5e13 neuts/sec), no H-mode |
| Dec 6 1995 04:44:04:630PM | 951206035 | Yuichi Takase | Shot 35 plasma
turned off position feedback no pellet, got H-mode, short D-port |
| Dec 6 1995 04:44:21:940PM | 951206036 | Yuichi Takase | Shot 36 plasma
got pellet, D-port tripped early, PEP, no H-mode |
| Dec 6 1995 04:44:39:670PM | 951206037 | Yuichi Takase | Shot 37 plasma
disruption @ .22sec, runaway shot |
| Dec 6 1995 04:44:54:730PM | 951206038 | Yuichi Takase | Shot 38 plasma
over-gassed, disrupt @ .46sec |
| Dec 6 1995 05:07:26:620PM | 951206039 | Yuichi Takase | Shot 39 plasma
disrupt @.41sec |
| Dec 6 1995 05:07:47:420PM | 951206040 | Yuichi Takase | Shot 40 plasma
reload 95120603 |
| Dec 6 1995 05:08:40:000PM | 951206041 | Yuichi Takase | Shot 41 fizzle
removed extra gas after RF turn-on |
| Physics Operator Comments | |||
| Dec 6 1995 10:22:57:690AM | Joseph Snipes | ICRF H-mode Run 951206
Engineer in Charge: Vince Bertolino Physicist in Charge: Joseph Snipes Session Leader: Yuichi Takase Goal: To improve the ICRF H-mode with high ICRF power (3 MW). We will attempt to improve the H-mode by moving the lower X point up and down and vary the gas feed and density programming. | |
| Dec 6 1995 10:32:15:450AM | 951206001 | Joseph Snipes | Shot 1 : Start with shot 951205043 with Br offset set to 7.5 mT. No TF.
Magnet resistance fault. |
| Dec 6 1995 10:32:44:520AM | 951206002 | Joseph Snipes | Shot 2 : Added 1 ms to the pre-puff. Got plasma, but too much gas.
Disrupted at 0.62 sec. |
| Dec 6 1995 10:33:09:650AM | 951206003 | Joseph Snipes | Shot 3 : Copied shot 951205039, but reduced the gas early and throughout
the pulse. Set the pre-RF density to 1.4 x 10^20 m^-3. Br offset set to 7.5 mT. Ip set to 0.8 MA. Short H-mode. Disrupted at 1.2 sec. |
| Dec 6 1995 10:33:43:530AM | 951206004 | Joseph Snipes | Shot 4 : Increased ramp of RCUR and CLEARIN during rampdown to bring the
plasma against the inner wall to pump out the density. Still disrupted at 1.14 sec. H-mode 0.6 - 0.9 sec. |
| Dec 6 1995 10:34:03:650AM | 951206005 | Joseph Snipes | Shot 5 : Increased ramp of RCUR and CLEARIN during rampdown to bring the
plasma against the inner wall to pump out the density. H-mode from 0.6 - 0.9 sec. Disrupted at 1.26 sec. |
| Dec 6 1995 10:34:23:190AM | 951206006 | Joseph Snipes | Shot 6 : Increased ramp of RCUR and CLEARIN during rampdown to bring the
plasma against the inner wall to pump out the density. H-mode from 0.66 - 0.87 sec. Disrupted at 1.15 sec. |
| Dec 6 1995 10:34:47:850AM | 951206007 | Joseph Snipes | Shot 7 : Set RXL gain to 18 from 1 to 1.4 sec to try to keep the strike
point from crawling up the inner nose during rampdown. Disrupted violently at 0.92 sec apparently due to the RF radial position feedback causing a vertical instability. It disrupted up. |
| Dec 6 1995 10:35:07:130AM | 951206008 | Joseph Snipes | Shot 8 : Golovato reduced the feedback loading resistance. Plasma
disrupted at 0.25 sec. OH2L fault. Interferometer died as well. |
| Dec 6 1995 10:40:06:290AM | 951206009 | Joseph Snipes | Shot 9 : Repeat. Disrupted at 0.96 sec.
|
| Dec 6 1995 10:40:32:490AM | 951206010 | Joseph Snipes | Shot 10: Copied shot 951205025. Fiducial. Fizzle!
|
| Dec 6 1995 10:42:49:550AM | 951206011 | Joseph Snipes | Shot 11: Fiducial. Changed pre-puff to 13 ms flattop and Br offset to 7.5
mT. Good fiducial. Wall conditions look pretty bad. No H-mode. Disrupted at 1.2 sec. |
| Dec 6 1995 11:07:26:740AM | 951206012 | Joseph Snipes | Shot 12: Loaded shot 951206005. Hard x rays from 0.03 sec. Disrupted at
0.23 sec. |
| Dec 6 1995 11:31:46:800AM | 951206013 | Joseph Snipes | Shot 13: Increased early gas a bit between 0.01 and 0.1 sec.
Good shot. H-mode from 0.66 - 0.76 sec. |
| Dec 6 1995 11:32:24:760AM | 951206014 | Joseph Snipes | Shot 14: Changed RXL and ZXL programming to move the X point up and out by
1 cm in each direction from 0.6 to 1 sec. Large density oscillations. Gas feedback unstable. Disrupted at 1.28 sec. |
| Dec 6 1995 11:45:33:430AM | 951206015 | Joseph Snipes | Shot 15: Lowered nl04 request to 1.2 x 10^20 m^-2. H-mode from 0.64 - 1.01
sec. with high recycling in the divertor. |
| Dec 6 1995 11:59:21:380AM | 951206016 | Joseph Snipes | Shot 16: Moved RXL back to -0.005 m and ZXL down 2 cm. ELMy H-mode from
0.68 - 0.82 sec. RF tripped at 0.82 sec to half the peak power. |
| Dec 6 1995 12:09:47:030PM | 951206017 | Joseph Snipes | Shot 17: Moved RXL to 0 and ZXL down another 0.5 cm ramping from -3.2 to
-3.5 cm. Some signs of H-mode from 0.62 - 0.84 sec in the divertor, but not much of a density rise. |
| Dec 6 1995 01:12:03:250PM | 951206018 | Joseph Snipes | Shot 18: Increased Ar puff duration by 2 msec. Reloaded shot 951206013
Disrupted violently at 0.52 sec. Appears to be a moly UFO. |
| Dec 6 1995 01:12:27:560PM | 951206019 | Joseph Snipes | Shot 19: Copied STRKPSI controllers from shot 950131011 as well as RXL and
ZXL. Disrupted at 0.22 sec. STRKPSI control killed the plasma. |
| Dec 6 1995 01:12:53:640PM | 951206020 | Joseph Snipes | Shot 20: Changed start time of STRKPSI controller to 0.47 sec. Disrupted
at 0.5 sec. Clearly the STRKPSI controller is not working. |
| Dec 6 1995 01:13:17:330PM | 951206021 | Joseph Snipes | Shot 21: Loaded shot 951206018. Good shot. H-modes from 0.65 - 0.79 sec.
|
| Dec 6 1995 01:30:45:060PM | 951206022 | Joseph Snipes | Shot 22: Reduced Ip to 0.6 MA. Reduced Ar by 2 msec. Reduced density to
1 x 10^20 m^-2 with a step up to 1.5 x 10^20 m^-2. |
| Dec 6 1995 01:38:57:180PM | 951206023 | Joseph Snipes | Shot 23: Increased density from 0.6 to 1 sec from 1.5 to 1.8 x 10^20 m^-2.
Added gas pre-programming on A side valve. Good shot. H-mode from 0.68 - 0.96 sec. |
| Dec 6 1995 01:53:04:800PM | 951206024 | Joseph Snipes | Shot 24: Raised nl04 to 1.2 x 10^20 m^-2 before the RF and then increased
to 2.2 x 10^20 m^-2 during the RF. Good shot. RF tripped. Short H-mode from 0.67 to 0.7 sec. |
| Dec 6 1995 02:13:58:460PM | 951206025 | Joseph Snipes | Shot 25: Raised Ip to 1 MA. Good shot. ELMy H-mode from 0.65 - 0.98 sec.
|
| Dec 6 1995 02:25:39:300PM | 951206026 | Joseph Snipes | Shot 26: Increased Ar puff to 22 msec duration. Increased density to 1.5
x 10^20 m^-2 before RF and up to 3 x 10^20 m^-2 during RF. Increased pre-programmed gas on A side throughout the discharge. Good shot. nl04 and density feedback failed. |
| Dec 6 1995 02:45:27:360PM | 951206027 | Joseph Snipes | Shot 27: Repeat with nl04. Good shot. ELMy H-modes from 0.62 - 1.06 sec.
|
| Dec 6 1995 02:47:53:720PM | 951206028 | Joseph Snipes | Shot 28: Raised nl04 from 0.8 to 1 sec to 3 x 10^20 m^-2. Increased gas
puffing on A side. ELMy H-mode from 0.63 - 0.9 sec. |
| Dec 6 1995 03:52:01:200PM | 951206029 | Joseph Snipes | Shot 29: Turned on B side upper gas valve with deuterium at 50 V during the
flattop. Good shot. H-mode from 0.64 - 0.88 sec. |
| Dec 6 1995 03:52:35:890PM | 951206030 | Joseph Snipes | Shot 30: Only 1.5 MW of RF. No H-mode.
|
| Dec 6 1995 03:53:24:100PM | 951206031 | Joseph Snipes | Shot 31: B side upper gas set to 100 V from 0.3 to 0.45 sec, then 90 V from
0.45 to 1 sec. Good shot. Density ramps up to 2.4 x 10^20 m^-2 without RF. No H-mode. |
| Dec 6 1995 03:53:51:580PM | 951206032 | Joseph Snipes | Shot 32: B side upper turned off. A side pre-programmed gas turned down to
60 V. Lithium pellet at 0.58 sec. Fizzle! |
| Dec 6 1995 03:54:16:840PM | 951206033 | Joseph Snipes | Shot 33: Lithium pellet at 0.58 sec. Disrupted at 0.72 sec. Large
oscillation in RCUR. Short PEP H-mode from 0.62 - 0.67 sec. |
| Dec 6 1995 04:01:49:820PM | 951206034 | Joseph Snipes | Shot 34: RF radial feedback gain changed from -2750 to -2000. Li pellet at
0.58 sec. Disrupted at 0.675 sec. |
| Dec 6 1995 04:18:54:900PM | 951206035 | Joseph Snipes | Shot 35: RF radial feedback turned off by Golovato. Li pellet requested at
0.58 sec. No pellet. RF tripped at 0.67 s. H-modes between 0.65 and 0.79 sec. |
| Dec 6 1995 04:20:42:440PM | 951206036 | Joseph Snipes | Shot 36: One more time. Li pellet at 0.58 sec. Low RF. No H-mode. No PEP
mode. |
| Dec 6 1995 04:33:24:350PM | 951206037 | Joseph Snipes | Shot 37: Runaway discharge from 0.03 sec. Disrupted at 0.215 sec.
|
| Dec 6 1995 04:54:51:560PM | 951206038 | Joseph Snipes | Shot 38: Increased early gas puff. Still hard x rays from 0.03 sec.
Disrupted at 0.46 sec. |
| Dec 6 1995 04:55:11:130PM | 951206039 | Joseph Snipes | Shot 39: Increased early gas puff some more and increased pre-puff by 2
msec. |
| Dec 6 1995 05:08:07:170PM | 951206040 | Joseph Snipes | Shot 40: Loaded segment 1 from shot 36. Increased pre-puff to 15 msec
duration. O.K. shot. Li pellet at 0.58 sec. Disrupted at 0.835 sec. |
| Dec 6 1995 05:08:38:180PM | 951206041 | Joseph Snipes | Shot 41: Fizzle!
|
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:43:49:650AM | Plasma | Bad | mag res fault |
| 2 | 08:50:30:220AM | Plasma | Ok | |
| 3 | 09:07:06:930AM | Plasma | Ok | |
| 4 | 09:18:12:950AM | Plasma | Ok | |
| 5 | 09:29:10:040AM | Plasma | Ok | |
| 6 | 09:39:28:550AM | Plasma | Ok | |
| 7 | 09:54:27:770AM | Plasma | Ok | |
| 8 | 10:08:10:330AM | Plasma | Bad | oh2l comm fault |
| 9 | 10:22:07:890AM | Plasma | Ok | |
| 10 | 10:30:15:160AM | Plasma | Ok | |
| 11 | 10:38:58:220AM | Plasma | Ok | |
| 12 | 10:54:08:640AM | Plasma | Ok | |
| 13 | 11:04:29:910AM | Plasma | Ok | |
| 14 | 11:20:31:030AM | Plasma | Ok | |
| 15 | 11:31:16:240AM | Plasma | Ok | |
| 16 | 11:44:36:110AM | Plasma | Ok | |
| 17 | 11:59:13:960AM | Plasma | Ok | |
| 18 | 12:17:57:830PM | Plasma | Ok | |
| 19 | 12:32:27:210PM | Plasma | Ok | |
| 20 | 12:50:53:720PM | Plasma | Ok | |
| 21 | 12:58:34:060PM | Plasma | Ok | |
| 22 | 01:13:16:650PM | Plasma | Ok | |
| 23 | 01:29:38:720PM | Plasma | Ok | |
| 24 | 01:39:47:150PM | Plasma | Ok | |
| 25 | 01:54:40:320PM | Plasma | Ok | |
| 26 | 02:13:11:580PM | Plasma | Ok | |
| 27 | 02:24:33:470PM | Plasma | Ok | |
| 28 | 02:38:02:420PM | Plasma | Ok | |
| 29 | 02:48:12:490PM | Plasma | Ok | |
| 30 | 02:56:35:410PM | Plasma | Ok | |
| 31 | 03:06:01:790PM | Plasma | Ok | |
| 32 | 03:22:47:210PM | Plasma | Ok | |
| 33 | 03:31:55:970PM | Plasma | Ok | |
| 34 | 03:50:42:430PM | Plasma | Ok | |
| 35 | 04:01:36:520PM | Plasma | Ok | |
| 36 | 04:12:44:240PM | Plasma | Ok | |
| 37 | 04:25:42:570PM | Plasma | Ok | |
| 38 | 04:34:57:650PM | Plasma | Ok | |
| 39 | 04:45:18:830PM | Plasma | Ok | |
| 40 | 04:54:01:840PM | Plasma | Ok | |
| 41 | 05:05:31:000PM | Plasma | Ok | |