Miniproposals

Miniproposal: 430 Date Filed: 7/26/2005 Title: Localization of the effect of boronization First Author: Bruce Lipschultz Session Leader: Bruce Lipschultz (shots 1-30) Session Leader: Earl Marmar (shots 7-30)

Engineering Operator Run Comment

MP#430 Localization of the effect of boronization SL: Lipschultz PO: Irb

Session Leader Plans

Entered: Aug 9 2005 02:56:40:387PM

Author: Bruce Lipschultz

MP430 - Between shot boronization Assume 15 minute boronization length to start with. Pressure 5 mT. Pause at center of each scan. No ECDC before run. Note - We will be using the new 20% diborane 80% He mixture which has twice the amount of diborane as usual. Dream up different ways to reduce fizzles after boronization (e.g. wait longer, ECDC in He after the diboarne....) Note 2 - We are starting up having already done the outer scan of boronization (70-95 cm). 1) Take 1-2 shots - 1050805019 is fine. Basically our 1 MA standard shot. This will be the un-boronized background 2) Boronize between shots with scan width of 25 cm (inner edge 45 cm). Take 2 shots to ascertain the effect. Make sure the last shot returns to shot in step 1. 3) Decide which of the above scan regions is better and go to next step. 4) Boronize sequence (1 shot to measure effect, 2nd shot to determine if it has worn off) using 10 cm wide scans to cover the better 25 cm region selected above. Work from outer major radius inward in 5 cm steps. (10 shots minimum not including fizzles) 5) Once done with the scan, return to the most effective location. Vary the pressure during the boronization below the usual value to 1 mTorr and 0.5 mTorr. If there is an effect explore it (4 shots min, not including fizzles). 6) Compare the usual boronization including pulsed ECDC with leaving the ECDC on steadily during the period. 7) If not done earlier then reduce the length of boronizations now to 10 and 5 minutes length (4 shots min. if not including fizzles).

Physics Operators Plans

Entered: Aug 10 2005 09:23:55:773AM

Author: Jim Irby

Engineering setup and Physop plan for Wednesday, August 10, 2005 MP#430 Localization of the effect of boronization SL: Lipschultz/Marmar PO: Irby Run begins 09:00 and ends 17:00 (with option to extend to 19:00) No overnight ECDC, bake at 60C Depending on results, we may decide either to extend the run to 19:00 or to do an overnight boronization after completing the run at 17:00. **************************************************************************** This run will use between-shot boronization. No Non-emergency access to cell or power room once the diborane bottle is opened. **************************************************************************** We will want one successful data system cycle before the diborane bottle is opened, in case a crate needs to be power-cycled in the cell or power room. The test cycle should probably be done as early as possible, before lockup. Engineering setup: ------------------- Power systems as on 1050809016 A-coil in standard configuration: +Dtop -Dbot -Jtop +Jbot, C-coil Start=0.3sec, Invert=2.0sec ICRF in Run-on by 08:30AM Gas Setup: ---------- fill B-top 6psi D2 Hybrid Enabled (PG4) fill B-side lower 10 psi Helium Hybrid Disabled (PG1) leave B-side Upper alone (15psi He3) Hybrid Enabled (PG2) fill B-main 40psi D2 Hybrid Enabled (PG3) NINJA: 10psi D2 Boronization system set up for between-shot boronization Enable ECE, VUV, Z-bolo shutter for all plasma shots; these must be disabled for between-shot boronization The A-Side TV camera shutter must be CLOSED before the start of the run, and remain closed throughout the day. The wide1 TV view will not be available for this run. The MSE shutter must be CLOSED before the start of the run, and remain closed throughout the day.

Session Leader Summaries

Entered: Aug 11 2005 06:27:17:823PM

Author: Bruce Lipschultz

MP340 - localization of boronization co-session leaders B. Lipschultz and E. Marmar The run was generally successful. A summary of shot#s and information is at the end: We were able to run a number of 10 cm boronization scans and the best spot was identified (center 70 cm). We also were able to show that dropping the pulses in the ECDC microwaves enhanced the boronization (comparison of shots 27 and 28). Much progress was made on reducing post-boronization fizzles - see PO log. We ended 1050809 having 2 fizzles after each boronization. By the end of run we were alternating between 1 and no fizzles after a boronization. The problems from yesterday continued to dog us today along with the many fizzles. We required several entries into the cell with SCBA gear to reset CAMAC and power supplies. In addition, it is clear that there are too many things that need changing before/after a boronization leading to mistakes being made. The worst of these was the He3 being turned off which was not discovered for 1.5 hours or so. We judged the 'goodness' of boronization by a number of factors. The stored energy, the rate of increase of 2Pi bolo radiation (diode) at the beginning of the H-mode and the radiation before the H-mode. The latter 2 are important in that they are supposed to relate the reduction in Mo (radiation). On the basis of these there was a shallow minimum in the radiation and dprad/dt and a maximum in Wtot. We did run one check of the repeatability of the boronization effect. Shot 27 was basically an overlay of shot 12, the bext today. We did find that we may have boronized 'too much'. Shot 29 had very low radiation but not very good confinement. Shot 30 had much more radiation and probably would have had better confinement than 29 if not for injections and RF trips. While the above data is consistent within what happened on 1050810 there is, at first glance, an inconsistency with the little bit of data from 1050809. During that run we ran a 15 minute boronization scan from 70-95 cm, pause midway. The shot after the boronization (10) had stored energy of 164, 16kj better than our best shot today (after a 10 minute boronization). The 25 cm boronization scan was centered at a location where today's run indicates the boronization should have a poor effect. So, an inconsistency in Wtot modulo the length of the boronization. On the other hand the radiation measures are more consistent between the 1050809 and 010 data. We are not sure whether there are other variables at work across days. The fact that the Wtot data is less consistent than the Prad data may be important. We suspect that radiation being low is necessary but not sufficient for good H-modes; shot 29 from today is an example. The comparison of 1050809 data today's may be another example. The following table is a summary of the shots, When a scan width is shown it means that the boronization occured between that shot and the previous shot. shot scan_ctr scan_width ECDC_pulsed 2 none 4 57 25 yes 5 none 7 90 10 yes 9 80 10 yes 12 70 10 yes 14 none 16 60 10 yes 17 100 10 yes 19 70 10 yes 20 70 21 60 10 yes 22 60 24 65 10 yes 27 70 10 yes 28 70 10 no 29 70 20 no 30 70

Entered: Aug 12 2005 05:15:49:103PM

Author: Earl Marmar

MP430 Between-shot boronization Co-session leaders: B. Lipschultz, E. Marmar The purpose of the run was to compare the efficacy of different ECDC resonance sweeps for between-shot boronization. One decent scan was made in ~10 cm increments, with each scan covering +/- 5 cm around the dwell position. 10 minutes of boronization was done, with the usual magnetron duty factor (flashing). While the results were somewhat subtle, it appeared that scanning in the vicinity of 60 to 75 cm was most effective, 55-65 and >75 less effective. One measure that gave a reasonably clear result is to compare the L-mode radiated power during RF (~1 MW from E at 80 MHz, + ~2MW from J at 50 MHz) just before the L to H transition, as a function of ECDC dwell position. The result, using shots 7, 9, 12, 21, 24 and 27 is shown here, taking 2*prad_2pi for the radiated power: One possibly relevant observation (pointed out to me by Steve Wolfe) is that for today's shots, the He-3 minority resonance for 50 MHz is at R = 70 cm. At the top of the machine, R=70 cm is near the surface of the gusset protection tiles; at the bottom, R=70 is near the outer edge of the shelf. Discussing this with Jim Terry, he pointed out that there is a band of the outer shelf that gets bright on the IR camera images, correlated with the RF power. On shot 12, the location of the band is close to R=70 cm. This definitely bears further investigation. At the end of the run, we tried boronizing with 100% duty factor on the magnetron (no flashing). This was done for 10 minutes prior to shot 28, and 20 minutes prior to shot 29. Both 28 and 29 had quite low radiated power during the H-mode phases, although confinement was not noticeably better than on earlier shots. Shot 30 (no additional boronization) also had low radiated power (below 1 MW using 2*Prad_2pi). For the shots with the best confinement, H89~1.4.

Physics Operator Summaries

Entered: Aug 11 2005 08:05:20:983AM

Author: Jim Irby

The machine ran well today, though we still had many fizzles caused by the between shot boronization. However, during the course of the run day we were able to come up with a reasonably successful way of avoiding the fizzles by reducing the prefill gas pulse-width to 8 ms. Running the prefill as low as 6 ms still resulted in a fizzle, not a dud. We also waited until the machine basepressure reached 4e-6 Torr before we went into INIT. We had only one boronization sequence in which two fizzles followed the boronization. Small tweaks in both the prefill and Bz0 fixed the problem. Bz0 had been slowly drifting up throughout the day. Some sort of miscommunication resulted in shots 16 to 19 not having helium 3 as requested. The important scans from this range of shots were repeated later in the run. test 01 dud fizzle 03,06,10,11,13,15,18,23,25,26 plasma 02,04,05,07,08,09,12,14,16,17 19,20,21,22,24,27,28,29,30 total cycles

Session Leader Comments
Aug 10 2005 12:09:31:973PM		Earl Marmar	between-shot boronization using GA diborane bottle (16.3 liter, 20% B_2D_6, 80% helium)
Aug 10 2005 09:48:11:947AM	1050810002	Bruce Lipschultz	Unboronized shot at 1 MA RF - no trips dPrad/dt = 5.4 H89 = 1. Wtot = 124. neuts = 10e12 boronize before next shot from 45-70 cm dwell at 57 McPherson memory module has a problem. Needs to be cycled after shot 3.
Aug 10 2005 09:53:29:707AM	1050810003	Bruce Lipschultz	fizzle - almost made it.
Aug 10 2005 10:33:47:990AM	1050810005	Bruce Lipschultz	2nd shot after 45-70 cm boronization RF - no trips. dPrad/dt = 6.0 H89 = 1.2 Wtot = 121. neuts = 12e12 McPherson working Next boronization from 85 -95, pause at 90 cm
Aug 10 2005 10:52:28:717AM	1050810006	Bruce Lipschultz	fizzle
Aug 10 2005 11:31:52:093AM	1050810007	Bruce Lipschultz	1st shot after 89-95 scan dPrad/dt = 5.0 H89 = 1.1 Wtot = 127. neuts = 14e12
Aug 10 2005 11:34:45:763AM	1050810007	Earl Marmar	After shot 5, boronize 10 minutes, scan 85 - 95, dwell 90 Shot 6 was a fizzle boronization does not appear to have been effective very similar to shot 2 total neutrons (.7 < t < 1.2) = 3.5e12 initial H-mode d(Prad)/dt = 10 MW/s
Aug 10 2005 11:32:48:593AM	1050810008	Bruce Lipschultz	2nd shot after 89-95 scan disrupted early at 0.32s Next, boronize from 75-85 cm, pause at 80
Aug 10 2005 12:08:47:520PM	1050810009	Earl Marmar	10 minutes boronization before this shot ECDC scan from 75 to 85 cm, dwell at 80 plasma looks quite unboronized total neuts (.7 < t < 1.2) = 3.5e12 initial H-mode d(Prad)/dt = 14 MW/s
Aug 10 2005 12:11:46:220PM	1050810009	Bruce Lipschultz	1st shot after 75-85 scan Prad/dt = 7.0 H89 = 1.1 Wtot = 120. neuts = 11e12
Aug 10 2005 12:13:45:797PM	1050810010	Bruce Lipschultz	fizzle
Aug 10 2005 12:39:25:407PM	1050810011	Bruce Lipschultz	post-boronization fizzle
Aug 10 2005 01:10:24:223PM	1050810012	Earl Marmar	10 minute boronization prior to this shot scan from 65 to 75 cm, dwell at 70 plasma better than earlier 10 minute efforts total neuts (.7 < t < 1.2) = 4.7e12 initial H-mode d(Prad)/dt = 4.3 MW/s
Aug 10 2005 01:10:45:250PM	1050810013	Bruce Lipschultz	fizzle
Aug 10 2005 01:24:54:113PM	1050810014	Earl Marmar	second shot following 10 minute boronization scan from 65 to 75 cm, dwell at 70 plasma looks unboronized total neuts (.7 < t < 1.2) = 3.3e12 initial H-mode d(Prad)/dt = 15-20 MW/s
Aug 10 2005 01:29:08:493PM	1050810014	Bruce Lipschultz	2nd shot after 65-75 boronization scan dPrad/dt = 7 H89 = 1.1 Wtot = 124. neuts = 10e12 boronize now in range 55-65 cm
Aug 10 2005 01:42:07:820PM	1050810015	Bruce Lipschultz	fizzle
Aug 10 2005 02:17:24:557PM	1050810016	Bruce Lipschultz	1st shot after the 55-65 cm scan dPrad/dt = 5.9 H89 = 0.9 Wtot = 110. neuts = 7e12 pretty bad. Don't need a second shot to make sure that boronization is gone boronize from 95-105 before nexrt shot
Aug 10 2005 03:46:32:147PM	1050810016	Earl Marmar	first plasma following 10 minute boronization scan from 55 to 65 cm, dwell at 60 plasma looks poorly boronized total neuts (.7 < t < 1.2) = 2.0e12 initial H-mode d(Prad)/dt = 11 MW/s operator error: no He-3 puffed on this shot; discovered after shot 19 will need to repeat this part of the scan
Aug 10 2005 02:30:01:817PM	1050810017	Bruce Lipschultz	1st shot after the 95-105 cm scan dPrad/dt = 6.0 H89 = 0.86 Wtot = 100. neuts = 4e12 pretty bad. Don't need a second shot to make sure that boronization is gone boronize from 65-75 before next shot to see if the best shot reproduces
Aug 10 2005 03:47:14:540PM	1050810017	Earl Marmar	first plasma following 10 minute boronization scan from 95 to 105 cm, dwell at 100 plasma looks poorly boronized total neuts (.7 < t < 1.2) = 1.4e12 initial H-mode d(Prad)/dt = 12.5 MW/s operator error: no He-3 puffed; not a valid point
Aug 10 2005 03:28:12:797PM	1050810018	Bruce Lipschultz	fizzle
Aug 10 2005 03:31:58:373PM	1050810019	Bruce Lipschultz	return to 55-65 scan to see if the good results there reproduce, 1st shot post boronization L-mode!!! Steve Wolfe discovered that shots 16 and on have had no He3 puff so the heating should not be working. Matt Reinke has been pointing out that the Ti injections have increased by a factor of 10. So this explains that. Next shot repeat with He3 before we repeat the boronization centeredt at 60 cm.
Aug 10 2005 03:33:43:717PM	1050810020	Bruce Lipschultz	He3 on and H-modes return dPrad/dt = 6.5 H89 = 1. Wtot = 116. neuts = 12e12 Now boronize in range 55-65 for the next shot
Aug 10 2005 03:50:44:583PM	1050810021	Earl Marmar	first plasma following 10 minute boronization scan from 55 to 65 cm, dwell at 60 plasma looks similar to shot 12 total neuts (.7 < t < 1.2) = 3.9e12 initial H-mode d(Prad)/dt = 6 MW/s
Aug 10 2005 05:30:03:077PM	1050810021	Bruce Lipschultz	1st shot after boronization scan 55-65 cm dPrad/dt = 3.3 H89 = 1.3 Wtot = 136. neuts = 17e12
Aug 10 2005 05:30:55:217PM	1050810022	Bruce Lipschultz	2nd shot after 55-65 scan (repeat with He3 on) dPrad/dt = 5.6 H89 = 1. Wtot = 120. neuts = 10e12 now boronize in range 60-70 cm to go between our 2 best points
Aug 10 2005 05:02:12:730PM	1050810024	Bruce Lipschultz	1st shot after 60-70 scan (repeat with He3 on) dPrad/dt = 3.8 H89 = 1.2 Wtot = 138. neuts = 16e12 now boronize in range 65-75 cm to repeat our best point
Aug 10 2005 06:18:41:497PM	1050810024	Earl Marmar	first plasma following 10 minute boronization scan from 60 to 70 cm, dwell at 65 plasma looks similar to shot 21 total neuts (.7 < t < 1.2) = 3.7e12 initial H-mode d(Prad)/dt = 8.5 MW/s
Aug 10 2005 05:18:07:830PM	1050810025	Bruce Lipschultz	fizzle
Aug 10 2005 05:25:49:250PM	1050810026	Bruce Lipschultz	fizzle
Aug 10 2005 05:57:28:740PM	1050810027	Bruce Lipschultz	1st shot after repeat boronization scan 65-75 cm dPrad/dt = 3.2 H89 = 1.35 Wtot = 143 neuts = 22e12 A fairly good repeat of shot 12 So mow boronize at the same place but without pulsing the ECRH to let the gas circulate
Aug 10 2005 06:14:47:683PM	1050810027	Earl Marmar	first plasma following 10 minute boronization scan from 65 to 75 cm, dwell at 70 plasma a bit better than shot 12 total neuts (.7 < t < 1.2) = 4.5e12 initial H-mode d(Prad)/dt = 5.4 MW/s
Aug 10 2005 06:20:18:730PM	1050810028	Earl Marmar	first plasma following 10 minute boronization scan from 65 to 75 cm, dwell at 70, 100% duty cycle on magnetron plasma similar to 27, but heading higher, hit by injection at .88 seconds total neuts (.7 < t < 1.2) = 4.9e12 initial H-mode d(Prad)/dt = 3.2 MW/s
Aug 10 2005 06:21:33:900PM	1050810028	Bruce Lipschultz	1st shot after repeat boronization scan 65-75 cm with no 'flashing' of the ECDC on/off dPrad/dt = 1.6 H89 = 1.6 Wtot = 147 neuts = 24e12 large Mo injection at .88s better than shot 12 So mow boronize for 20 minutes at the same place but without pulsing the ECRH to let the gas circulate
Aug 10 2005 06:57:51:497PM	1050810029	Earl Marmar	first plasma following 20 minute boronization scan from 65 to 75 cm, dwell at 70, 100% duty cycle on magnetron plasma constant EDA H-mode, no droop in Wtot, neutron rate very low Prad, 2 small injections during RF stays in H-mode after RF turns off total neuts (.7 < t < 1.2) = 4.8e12 initial H-mode d(Prad)/dt = 2.1 MW/s
Aug 10 2005 06:59:39:293PM	1050810029	Bruce Lipschultz	1st shot after repeat boronization scan 65-75 cm for 20 minutes with no 'flashing' of the ECDC on/off dPrad/dt = 1.6 H89 = 1.3 Wtot = 136 neuts = 18e12 some small injections but the radiation is definitely lower. This does not correlate with the stored energy which should be correspondingly higher. repeat without boronization
Aug 10 2005 07:12:22:880PM	1050810030	Earl Marmar	second plasma following 20 minute boronization scan from 65 to 75 cm, dwell at 70, 100% duty cycle on magnetron plasma EDA H-mode, 2 RF trips, small injections Prad a bit higher than 29 stays in H-mode after RF turns off, but not as long as on shot 29 total neuts (.7 < t < 1.2) = 5.5e12 initial H-mode d(Prad)/dt = 5 MW/s
Aug 10 2005 07:31:02:280PM	1050810030	Bruce Lipschultz	2nd shot after repeat boronization scan 65-75 cm for 20 minutes with no 'flashing' of the ECDC on/off dPrad/dt = 1.6 H89 = 1.3 Wtot = 136 neuts = 18e12 radiation higher than 29 but the stored energy is lower? Other than radiation the midplane pressure is different (lower on 30).

Physics Operator Comments
Aug 10 2005 09:02:55:657AM	1050810001	Jim Irby	Cycle test --- pressure looks good
Aug 10 2005 09:19:20:043AM	1050810002	Jim Irby	Try for plasma --- no changes from 1050809016 plasma into rampdown --- 3 MW of rf again
Aug 10 2005 10:07:53:627AM	1050810003	Jim Irby	Boronization: 45/56/70 for 15 minutes Prefill from 23 to 18 ms fizzle --- no CIII --- pressure overlay of shot 1060809016 entry into cell to fix McPherson
Aug 10 2005 10:19:12:490AM	1050810004	Jim Irby	repeat --- gas still at 18 ms plasma into rampdown --- Ip hesitation at 80 ms injection at .88 s, radiated power looks better than on shot 2 except for the injection.
Aug 10 2005 10:36:13:563AM	1050810005	Jim Irby	prefill to 20 from 18 ms plasma into rampdown h/d lower than shot 4
Aug 10 2005 10:54:43:637AM	1050810006	Jim Irby	Boronization: 85/90/95 --- 10 minutes prefill from 20 to 14 ms wait for 4e-6 Torr fizzle --- ratiomatic pressure still higher than on shot 2
Aug 10 2005 11:08:13:607AM	1050810007	Jim Irby	prefill from 14 to 18 ms plasma into rampdown
Aug 10 2005 11:29:15:910AM	1050810008	Jim Irby	Cell entry before shot to fix edge TS, open RGA handvalve, and cycle probe supplies, LH data system check --- took about 20 minutes prefill from 18 to 20 ms plasma to 322 ms --- injection
Aug 10 2005 12:09:06:427PM	1050810009	Jim Irby	Boronization: 75/80/85 for 10 minutes Boronization start at 14 minutes, finish at 24 minutes IGT at 1.5e-6 Torr?? prefill from 20 to 11 ms plasma into rampdown
Aug 10 2005 12:15:40:403PM	1050810010	Jim Irby	prefill from 11 to 18 ms at init IGT at 1.5e-6 Torr fizzle --- but nearly 40 kA before we bounced
Aug 10 2005 01:09:26:223PM	1050810011	Jim Irby	Boronization: 65/70/75 for 10 minutes start at 7:00, finish at 17 minutes IGT 4e-6 Torr at init prefill from 18 to 11 ms fizzle
Aug 10 2005 12:56:36:463PM	1050810012	Jim Irby	prefill from 11 to 18 ms plasma into rampdown --- best shot of the day --- 140 kJ
Aug 10 2005 01:11:05:650PM	1050810013	Jim Irby	prefill from 18 to 20 ms 40 kA fizzle again
Aug 10 2005 01:26:33:490PM	1050810014	Jim Irby	no DPCS changes plasma into rampdown --- overlay of shot 2
Aug 10 2005 02:01:22:283PM	1050810016	Jim Irby	prefill from 9 to 18 ms plasma into rampdown --- 110 kJ --- no too good --- injection again 800 ms or s --- last two plasma shots had Ti injections (as determined from McPherson)
Aug 10 2005 02:24:26:757PM	1050810017	Jim Irby	Borononization: 95/100/105 for 10 minutes init started at 4e-6 Torr prefill to 6 ms plasma into rampdown --- not very good, but it ran...
Aug 10 2005 02:48:59:280PM	1050810018	Jim Irby	Boronization: 65/70/75 for 10 minutes prefill still at 6 ms init start at 4e-6 Torr fizzle --- nearly went (30 kA bounce)
Aug 10 2005 03:14:11:927PM	1050810019	Jim Irby	prefill to 18 ms plasma into rampdown Steve Wolfe just noticed that we have had no helium 3 puff since shot 15.
Aug 10 2005 03:25:25:310PM	1050810020	Jim Irby	prefill from 18 to 20 ms plasma into rampdown
Aug 10 2005 03:43:49:367PM	1050810021	Jim Irby	Boronization: 55/60/65 for 10 minutes prefill 7 ms IGT at 4e-6 Torr plasma into rampdown --- good startup --- very similar to shot 12
Aug 10 2005 03:55:38:050PM	1050810022	Jim Irby	prefill to 18 ms plasma into rampdown --- not as good as 21
Aug 10 2005 04:19:47:230PM	1050810023	Jim Irby	Boronization: 60/65/70 for 10 minutes prefill to 7 ms IGT at 4e-6 Torr at init fizzle
Aug 10 2005 04:48:36:200PM	1050810024	Jim Irby	prefill to 18 from 7 ms IGT 1.1e-6 at init --- long delay with LH tree hangup plasma into rampdown --- okay, but still not as good as 12 --- injection at 0.99 s
Aug 10 2005 05:19:04:330PM	1050810025	Jim Irby	Boronization: 65/70/75 for 10 minutes prefill 7 ms IGT 4e-6 at init fizzle --- pressure now too low
Aug 10 2005 05:30:31:123PM	1050810026	Jim Irby	prefill to 18 ms fizzle
Aug 10 2005 05:44:03:773PM	1050810027	Jim Irby	prefill to 19 ms ef4 from -1300 to -1325 A plasma into rampdown --- good as shot 12
Aug 10 2005 06:18:53:417PM	1050810028	Jim Irby	Boronization: 65/70/75 for 10 minutes --- no flashing prefill 8 ms IGT 4e-6 Torr at init --- took longer to pumpdown following this boronization plasma into rampdown --- looks very good --- 147 kJ
Aug 10 2005 06:55:45:387PM	1050810029	Jim Irby	Boronization: 65/70/75 for 20 minutes prefill 8 ms IGT 4.1e-6 Torr plasma into rampdown --- not as much stored energy, but Prad lower
Aug 10 2005 07:05:51:883PM	1050810030	Jim Irby	prefill to 18 ms plasma into rampdown

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:39:51:540AM	Test	Ok
2	09:14:03:033AM	Plasma	Ok
3	09:48:19:980AM	Plasma	Ok
4	10:07:53:987AM	Plasma	Ok
5	10:20:48:987AM	Plasma	Ok
6	10:47:11:800AM	Plasma	Ok
7	10:59:44:660AM	Plasma	Ok
8	11:24:48:197AM	Plasma	Ok
9	11:56:52:953AM	Plasma	Ok
10	12:11:50:877PM	Plasma	Ok
11	12:37:08:457PM	Plasma	Ok
12	12:49:25:457PM	Plasma	Ok
13	01:02:02:363PM	Plasma	Ok
14	01:14:34:877PM	Plasma	Ok
15	01:40:11:197PM	Plasma	Ok
16	01:52:40:457PM	Plasma	Ok
17	02:18:43:667PM	Plasma	Ok
18	02:45:11:203PM	Plasma	Ok
19	02:57:43:480PM	Plasma	Ok
20	03:13:15:503PM	Plasma	Ok
21	03:38:09:590PM	Plasma	Ok
22	03:50:55:257PM	Plasma	Ok
23	04:15:42:607PM	Plasma	Ok
24	04:41:37:767PM	Plasma	Ok
25	05:11:39:850PM	Plasma	Ok
26	05:24:10:423PM	Plasma	Ok
27	05:36:43:090PM	Plasma	Ok
28	06:07:25:220PM	Plasma	Ok
29	06:47:39:157PM	Plasma	Ok
30	07:00:43:417PM	Plasma	Ok