Miniproposals

Miniproposal: Date Filed: Title: First Author: Session Leader: Joseph Snipes (shots 1-29)

Engineering Operator Run Comment

H-MODE Silva/Bertolino-Snipe/Goetz

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:12:193PM

Author: To Be Determined

Run Summary for MP064A - ICRF H-mode Thresholds Engineer in Charge: Frank Silva Physicist in Charge: John Goetz Session Leader: Joseph Snipes The purpose of this run was to determine as much as possible about the density and input power dependence of the H-mode threshold with ICRF power. This is an urgent ITER requirement to better understand the power requirements for ITER to attain H-mode. Based on the problems found yesterday with the low field start-up scenario, we opted to return to our normal start-up at 5.3 T by copying segment 1 from shot 950202001, but we chose the main plasma from segment 2 of shot 950203011, which was a nice lower single null diverted equilibrium reasonably well matched to the RF antenna with reasonable inner and outer gaps for H-mode. Two hours of ECDC in helium were performed shortly before the run this morning. Although we did not have problems getting plasmas, the first few shots did not go into H-mode and had relatively high H alpha emission for the chosen density of nl = 7 x 10^19 m^-2. So, it seems that not enough time was allowed for the walls to be cleaned up or for the desorbed gases to be pumped away. Nonetheless, by shot 4, we did achieve H-mode. However, CAMAC errors on DAQ1 meant that we lost essential data such as the RF power among other things, so the shot will not be analyzable for the threshold. Overall, there were nine plasmas with H-mode at various densities. Contrary to the physics operators report, I feel that the mini-proposal was not completed in that we were not able to take the plasmas up in density at high RF power due to failure of the E port transmitter on shot 24. As such, we were able to complete only the low density scan and get a couple of intermediate density points. Still, these were significant accomplishments. The basic conclusions are that when the line integrated density is in the ohmic H-mode range (determined on 941221 run), very little RF power is required to get into H-mode, only 100 kW on shot 12. Trying to go slightly below the ohmic H-mode density (5 x 10^19 m^-2) range was unsuccessful even with RF power up to 1.2 MW, which had a P/(nBS) coefficient about four times the moderate density range value (up to 0.1). These plasmas were still sawtoothing with reasonably large sawteeth with no evidence of locked modes. So, the low density limit of 5 x 10^19 m^-2, which corresponds to about 1 x 10^20 m^-3 line averaged central density, appears to be a hard limit. A careful look at the radiated power needs to be made to see whether or not high radiation can explain this low density limit. Then, we also ran a few shots above the ohmic H-mode density range and found that going only slightly above the ohmic H-mode upper density limit (at this current 8 x 10^19 m^-2) to 9 x 10^19 m^-2 required 1 MW of RF power to achieve H-mode. Then, going to 1.0 x 10^20 m^-2 required 1.4 MW of RF power. Finally, one shot with rather large steps in power at 1.1 x 10^20 m^-2 required 2.4 MW of RF to get into H-mode. Given the large steps taken, the threshold power is somewhere between 1.8 MW and 2.4 MW. Thus, although there are only a few data points, it seems that the lower density limit to achieve H-mode is a hard limit and the upper density limit is not as hard, but the required power increases sharply with densities above the ohmic H-mode range. Thus, while there were a number of problems with this run, including 5 shots lost to power supply failures, one power supply test shot, one fizzle, and three shots in which essential data were lost due to CAMAC errors, there were still some very interesting and useful physics results obtained. Thanks to the engineering and technical staff for getting the number of good shots that we did achieve and to the RF group for getting the power in a lot of the time and to John Goetz for keeping the fizzles down to unity. Shotlist (* indicates H-mode) 1 Density at 7 x 10^19 m^-2, no RF, no H-mode 2 " " , with RF, no H-mode 3 " " " " 4 * " " , short H-modes with RF, DAQ1 data lost 5 * " " " " , good data! 6 * " " , long H-mode with RF from 0.68-1.03 sec 7,8,9 EF1 problems 10 EF1 only test shot 11 EF1 problem 12 * Density at 7 x 10^19 m^-2, two H-modes with RF, 0.6-0.75,0.85-1 sec 13 OH2 problem 14 Density at 5 x 10^19 m^-2, RF from 0.1-0.5 MW, no H-mode, no DAQ1 data 15 * " 6 " , RF up to 0.5 MW, H-mode at 0.84 sec 16 " 3 " , RF up to 0.6 MW, no H-mode 17 * " 6 " , RF up to 0.8 MW, H-mode 0.85-1.03 sec 18 " 3 " , little RF, no H-mode 19 " 3 " , RF up to 1.2 MW, no H-mode 20 " 3 " , RF up to 1.2 MW, no H-mode 21 " 5 " , RF up to 1.0 MW, no H-mode 22 Fizzle 23 Density at 1.4 x 10^20 m^-2, RF up to 1 MW, no H-mode 24 * " 1.1 " , RF up to 2.4 MW, short H-mode @ 0.72 s E port transmitter failed 25 * Density at 9 x 10^19 m^-2, RF up to 1 MW, H-mode from 0.725-1.1 sec 26 " 1 x 10^20 m^-2, RF up to 1.2 MW, dithering 27 " " , RF up to 1.4 MW, dithering, lost MAX data 28 * " " , RF up to 1.4 MW, H-mode 0.83-1.03 sec 29 " " , no RF, no Li pellets, no H-mode

Physics Operator Summaries

Entered: Jul 7 2004 04:36:53:147PM

Author: To Be Determined

Physics operator summary for 950208 EO: Silva PO: Goetz SL: Snipes Run 950208 was in support of Mini-Proposal #064A - H-mode Thresholds. The goal of this mini-proposal is to investigate the threshold power for achieving H-modes. Program for this run: - Setup a lower SN discharge with Ip=0.85MA and NL_04=0.7e20 - Stairstep RF power to investigate H-mode threshold - Lower density and repeat - Raise density and repeat This program was completely carried out. See the Session Leader's summary to find out how this program was carried out and for preliminary results. Some things discovered today: 1) Lowering the gain on the ZCUR(W2) during the rampdown phase will stop breaker trips in the OH stack for disruptions during rampdown and will keep the engineers happy. A proportional gain of 1.5 starting at 1.2sec seems acceptable. 2) It was necessary to program for a slight ( 2.5mm ) ramp in the CLEARIN to maintain a constant inner gap even at the low to medium densities of today's run. 3) Most of the disruptions today were late in the ramp-down and had Ip < 0.1MA. Some plasmas did disrupt soon after ramp-down began and there was no clear reason as to why, except that n/ncrit was beginning to soar. Programming the x-points to move out and/or remain stationary as CLEARIN and RCUR are ramped in seemed to help with the ramp-down also. 4) Programming ZXU for +.04 moved the upper x-point far enough away from the separatrix so that the rho=12mm flux surface wrapped from divertor to divertor. This wasn't important for this run, but for an EDGE run this might be useful to obtain a true lower SN discharge. Engineering, computing, and diagnostics today: Engineering problems today include the EF1L losing its gates on three shots. This is a problem that will not go away. Engineering says that the phase angle is right on the edge and some tuning during the upcoming maintenance period will be done. On one shot EF1U did not fire. As a consequence, OH2U went to 26kAmps trying to compensate the radial field and was induced to 30kA during commutation. On another shot, there was a funniness with the OH2L switch closing. It looks like it tried to close early. This led to a large mismatch (10kA) in the OH2's and a dud. IGOR ran well today, there were no hangs due to the speed of the servers. Serious problems with the DAQ1 highway today. Highway errors would appear at random times on random crates. This would bring down the highway. These were not time-out errors, but access errors, which cause the highway to crash. Much data were lost because of these problems. There were also problems with timing, decoders, scalars, etc. On one shot, part of the SCSI and DAQ1 data were just bit noise. RF has a circuit breaker problem that left only one transmitter operational by the end of the day. Check with the RF group if more than 1.8MW is required for a run. Scorecard: 29 shots = 25 plasmas + 1 fizzles + 2 p.s. dud + 1 p.s. test Shot summary for Run 950208 2 hours of He ECDC prior to the run Load segment 1 of 950202001 into segment 1 Load segment 2 of 950203011 into segment 2 NL_04 = 0.7e20 IP = -850000 CLEARIN = -.002 and I gain = 4 @ 0.375 P gain on ZCUR(W3) = 3 P_0 = 2.0e-5 Shot change result ____ _____ ______ 1 see above plasma - 0.88MA - disr @ 1.48 2 P gain on NL_04 off @ 0.6sec; PG3 off plasma - 0.85MA - disr. @ 1.36 CLEARIN=0; IP=-820000; P_0=1.8e-5 i.gap=1.5->1.3; o.gap=1.7 3 P gain on NL_04 off @ 0.8; P_0=1.6e-5 plasma - disr. @ 1.05 RCUR=0.661@1.0sec; P gain on ZCUR(W3) lots of hards =3 @ .325sec gaps better 4 NL_04 gain on always; P_0=1.8e-5 plasma - all the way down ZXU=+0.04 plenty of H-mode transitions 5 PG3=22V from 0.6 to 1.0sec; P gain on plasma - all the way down NL_04 off from 0.6 to 1.0 H-mode transitions 6 change RF step size; ZXU and ZXL out plasma - disr. @ 1.45 during rampdown H-mode from 0.68 to 1.0 (.25MW) 7 enable B_SIDE_LOWER and change RF steps plasma - crowbar @ 0.12 EF1L loses its gates 8 no changes plasma - disr. @ 0.633 EF1L loses its gates 9 no changes dud - EF1U didn't fire 10 no changes EF1 test; looks o.k. 11 no changes plasma - disr. @ 0.6 EF1L loses its gates again 12 delay ZXL gain switch until 0.125sec plasma - disr. @ 1.45 13 ZXL gain switch @ .11; NL_04=0.5e20 dud - large OH2 imbalance PG3=19V from 0.6 to 1.0 OH2U and OH1 didn't commutate 14 NL_04 gain notch from 0.5 to 1.0 plasma - disr. @ 1.43 NL_04=3e19 15 PG3=23V plasma - disr. @ 1.45 density rising thru shot 16 PG3=21.5V plasma - disr. @ 1.43 NL_04->0.3e20 thru shot 17 PG3=22.5->22->21.5 thru feedback plasma - disr. @ 1.43 NL_04->0.64e20 18 PG3=23V->18V plasma - disr. @ 1.08 NL_04->0.34e20; no RF 19 no changes plasma - disr. @ 1.43 NL_04=0.34e20 20 no changes plasma - disr. @ 1.09 NL_04=0.33e20 21 PG3=23V->21V plasma - disr. @ 1.07 NL_04=0.5e20 22 P gain on NL_04 = 4 fizzle - no current channel 23 NL_04=1.5e20; P_0=1.6e-5 plasma - disr. @ 1.42 NL_04 doesn't reach until 0.75 24 NL_04=1.1e20 plasma - disr. @ 1.43 25 NL_04 gain off from 0.6 to 1.05 plasma - disr. @ 1.45 PG3 = 26V from 0.5 to 1.0 26 NL_04=1.0e20 plasma - disr. @ 1.44 27 no changes plasma - disr. @ 1.44 28 NL_04=0.9e20; RXL=-.01 plasma - disr. @ 1.45 29 Li pellets @ 0.53 & 0.8sec; NL_04 plasma - disr. @ 1.32 feedback off; PG3=30V and notches

Session Leader Comments
Feb 8 1995 08:58:31:810AM	950208001	Joseph Snipes	Shot 1 Good set up shot. Copied programming from 950203011 for segment 2 and start up segment 1 from 950202001. Starting at 7 x 10^19 m^-2. No RF, no H-mode.
Feb 8 1995 09:03:37:100AM	950208002	Joseph Snipes	Shot 2 Good shot. Good steps starting at 0.5 s to 0.5 MW, then 0.7 sec to more than requested at about 1.2 MW until 1 sec. No H-mode.
Feb 8 1995 09:29:25:700AM	950208003	Joseph Snipes	Shot 3 Decent shot. Hard X rays. Good steps starting at 0.5 s to 0.5 MW, then 0.7 sec to 1 MW, then 0.8 sec to 1.7 MW to 1 sec. No H-mode.
Feb 8 1995 09:45:14:520AM	950208004	Joseph Snipes	Shot 4 Good shot. Nice short H-modes throughout the flattop. RF power stepped up to about 1 MW at 0.5 sec then up to 1.0 MW or so at 0.6 sec until 1 sec. However, we lost some data on DAQ1 including the RF power and gas pulse.
Feb 8 1995 10:01:11:750AM	950208005	Joseph Snipes	Shot 5 Great shot. Nice short H-modes throughout the flattop. RF power stepped up to about 0.4 MW at 0.5 sec then up to 1.0 MW at 0.6 sec, up to 1.5 at 0.7 sec with a small step at 0.8 sec then back to 1.5 MW at 0.85 sec until 1 sec. H-mode threshold at 0.4 MW.
Feb 8 1995 10:18:58:090AM	950208006	Joseph Snipes	Shot 6 Great shot. Nice long H-mode from 0.68 to 1.03 sec. RF power stepped up to about 0.1 MW at 0.5 sec then up to 0.26 MW at 0.6 sec, up to 0.4 MW at 0.7 sec with a small step at 0.8 sec to 0.45 MW then up to 0.5 MW at 0.9 sec until 1 sec. H-mode threshold at 0.26 MW.
Feb 8 1995 10:19:28:960AM	950208006	Joseph Snipes	Shot 6 Great shot. Nice long H-mode from 0.68 to 1.03 sec. RF power stepped up to about 0.1 MW at 0.5 sec then up to 0.26 MW at 0.6 sec, up to 0.4 MW at 0.7 sec with a small step at 0.8 sec to 0.45 MW then up to 0.5 MW at 0.9 sec until 1 sec. H-mode threshold at 0.26 MW.
Feb 8 1995 10:29:47:320AM	950208007	Joseph Snipes	Shot 7 Bad shot! EF1L power supply failure around 0.1 sec.
Feb 8 1995 10:46:05:070AM	950208008	Joseph Snipes	Shot 8 Bad shot! EF1L power supply failure around 0.5 sec. Violent disruption at about 0.64 sec.
Feb 8 1995 10:57:28:760AM	950208009	Joseph Snipes	Shot 9 No EF1U. No plasma!
Feb 8 1995 11:27:22:190AM	950208010	Joseph Snipes	Shot 10 EF1 only test.
Feb 8 1995 11:56:04:660AM	950208011	Joseph Snipes	Shot 11 Another EF1 failure at 0.6 sec.
Feb 8 1995 12:05:28:660PM	950208012	Joseph Snipes	Shot 12 Good shot! H-mode at 0.6 sec with about 100 kW of RF. Drops back to L-mode at 0.75 sec then returns to H-mode at about 0.85 sec until 1 sec with 250 - 300 kW of RF.
Feb 8 1995 12:26:52:990PM	950208013	Joseph Snipes	Shot 13 OH2 failure at commutation. No plasma!
Feb 8 1995 12:47:40:580PM	950208014	Joseph Snipes	Shot 14 Good shot. Lost data due to DAQ1 failure again. Got RF power steps from 0.1 MW to 0.5 MW. No H-mode. Try again without Ar puff.
Feb 8 1995 01:12:48:870PM	950208015	Joseph Snipes	Shot 15 Good shot. H-mode at 0.84 sec where nel was just under 6 x 10^19 m^-2 and the RF power was just below 0.5 MW.
Feb 8 1995 01:14:08:850PM	950208016	Joseph Snipes	Shot 16 Good shot. No H-mode. RF steps from 0.1 to 0.6 MW. Density drooped to 3 x 10^19 m^-2. Try again tweaking the density up a bit.
Feb 8 1995 01:39:20:380PM	950208017	Joseph Snipes	Shot 17 Good shot. H-mode from 0.85 to 1.03 sec. RF steps to 0.8 MW. Density a bit higher than I'd like at 6 x 10^19 m^-2. Try again tweaking the density down a bit.
Feb 8 1995 01:55:49:390PM	950208018	Joseph Snipes	Shot 18 Good shot. No H-mode. Very little RF. Ohmic power well above H-mode threshold. Density at 3 x 10^19 m^-2.
Feb 8 1995 01:57:47:620PM	950208019	Joseph Snipes	Shot 19 Good shot. No H-mode. RF up to 1.2 MW. Density at 3 x 10^19 m^-2.
Feb 8 1995 02:04:33:540PM	950208020	Joseph Snipes	Shot 19 Good shot. No H-mode. RF up to 1.2 MW. Density at 3 x 10^19 m^-2.
Feb 8 1995 02:05:28:850PM	950208020	Joseph Snipes	Shot 20 Good shot. No H-mode. RF up to 1.2 MW. Density at 3 x 10^19 m^-2. Next shot put density feedback back on to try to get 5 x 10^19 m^-2.
Feb 8 1995 02:32:19:640PM	950208021	Joseph Snipes	Shot 21 Now with density feedback again trying to get 5 x 10^19 m^-2. Good shot. Managed to get more or less the desired density. But, the RF reached only just over 1 MW.
Feb 8 1995 02:42:31:740PM	950208022	Joseph Snipes	Shot 22 Trying to get higher RF power. Fizzle. Forget it. Let's go to higher density and try to get higher power as well.
Feb 8 1995 03:06:56:970PM	950208023	Joseph Snipes	Shot 23 Good shot. Density up to about 1.4 x 10^20 m^-2. Goes detached late. Try lower density at 1.1 x 10^20 m^-2. Argon re-enabled for the next shot. No H-mode. RF power up to only 1 MW.
Feb 8 1995 03:27:00:770PM	950208024	Joseph Snipes	Shot 24 Good shot. Short H-mode at 0.72 sec with 2.4 MW of RF power. Next try to step the power around this level.
Feb 8 1995 04:19:46:700PM	950208025	Joseph Snipes	Shot 25 RF transmitter 2 failed. Maximum power now about 1.6 MW. So, we will go down to lower density at 9 x 10^19 m^-2. H-mode from 0.725 to 1.1 sec. Seems to be at threshold at about 1 MW.
Feb 8 1995 04:22:23:420PM	950208026	Joseph Snipes	Shot 26 Density set to 1.0 x 10^20 m^-2. Nearly got H-mode with many dithers. Try again with more power. RF had reached 1.2 MW.
Feb 8 1995 04:36:39:830PM	950208027	Joseph Snipes	Shot 27 Good shot. No H alpha data due to MAX failure. Seems to be dithering with no real H-mode. Try again to get higher power. RF power reached 1.4 MW.
Feb 8 1995 05:02:20:100PM	950208028	Joseph Snipes	Shot 28 Good shot! H-mode from 0.83 sec to 1.03 sec preceded by a dithering phase from 0.57 sec. RF power at 1.4 MW.
Feb 8 1995 05:33:13:010PM	950208028	Joseph Snipes	Shot 29 Injecting medium Li pellets (1.2 x 10^20 electrons) at 0.53 and 0.8 sec. Trying to get full RF from D port antenna from 0.564 sec to 1 sec. No pellets (gate valve failed to open), no RF, and no H-mode.
Feb 8 1995 05:39:13:910PM	950208029	Joseph Snipes	Overall, it was a reasonably successful run despite a series of diverse problems. Power supply failures cost us a number of shots, DAQ1 camac errors lost essential data for a couple of shots and slowed us down for several more because we had to reset the camac just as the shot was initializing. Finally, there were also some problems with the RF power, particularly the E port transmitter, which failed on shot 24. So, we were forced to go to lower density since we could not get enough power to explore H-modes at higher density. Nonetheless, we succeeded in finding a low density limit, which was basically at the ohmic H-mode low density limit of 5 x 10^19 m^-2 up to at least 1.4 MW of RF power. We also succeeded in getting H-modes up to nl's of 1.1 x 10^20 m^-2 with 2.4 MW of RF power.
Feb 8 1995 05:44:32:580PM	950208029	Joseph Snipes	The results show that the power thresholds with RF in the same density range in which ohmic H-mode is possible are about P/(nBS) = 0.02, which is about the ohmic value. Outside of that density range toward higher densities above nl = 8 x 10^19 m^-2, the threshold increases to 0.03 or even 0.04, approaching the ASDEX-Upgrade values. At densities below the ohmic H-mode range, no RF H-modes were observed up to P/(nBS) values of at least 0.08.

Physics Operator Comments
Feb 8 1995 08:14:39:470AM		John Goetz	Run 950208 - MiniProposal #064A - H Mode Threshold Plan for the day: 1) setup a 0.85MA lower SN discharge with NL_04=0.7e20 2) stairstep RF power to investigate the H-mode power threshold 3) lower density and repeat 4) raise density and repeat
Feb 8 1995 08:54:09:300AM	950208001	John Goetz	Shot 950208001: Load 950202001 segment 1 into segment 1 Load 950203011 segment 2 into segment 2 NL_04 = 0.7e20 IP = -850000 CLEARIN = -.002 and I gain = 4 @ 0.375 P gain on ZCUR(W3) = 3 P_0 = 2.0e-5 Results: Plasma - 0.88MA - disrupt @ 1.48 slow current rise i.gap = 1.2 o.gap = 1.6
Feb 8 1995 09:06:59:960AM	950208002	John Goetz	Shot 950208002: P gain on NL_04 off @ 0.6sec PG3 = 0 after 0.6sec CLEARIN = 0 IP = -820000 P_0 = 1.8E-5 Results: Plasma - 0.85MA - disrupts @ 1.36 current rise still slow i.gap = 1.5->1.3; o.gap=1.7
Feb 8 1995 09:20:44:600AM	950208003	John Goetz	Shot 950208003: P gain on NL_04 off @ 0.8sec puff PG3 in rampdown P_0 = 1.6E-5 RCUR = 0.661 @ 1.0 P gain on ZCUR(W3) = 3 @ .325sec Results: Plasma - disr. @ 1.05 lots of hards current rise is still slow
Feb 8 1995 09:43:47:100AM	950208004	John Goetz	Shot 950208004: P gain on NL_04 on for all time ZXU = +0.04 P_0 = 1.8e-5 Results: plasma - all the way down plenty of H-mode transitions density feedback going crazy during transitions
Feb 8 1995 09:55:39:890AM	950208005	John Goetz	Shot 950208005: P gain on NL_04 = 0 from 0.6 to 1.0sec PG3 = 22V from 0.6 to 1.0sec Results: plasma - all the way down H-mode transition at 0.4MW
Feb 8 1995 10:16:15:380AM	950208006	John Goetz	Shot 950208006: change RF step sizes Results: plasma - disr @ 1.45 H-mode from 0.68 to 1.0sec ( @ 0.25MW RF)
Feb 8 1995 10:51:23:220AM	950208007	John Goetz	Shot 950208007: enable B_SIDE_LOWER move ZXL out during rampdown Results: plasma - crowbars @ .12 EF1L loses its gates @ .038 - crowbars @ .1
Feb 8 1995 10:52:07:450AM	950208008	John Goetz	Shot 950208008: no changes Results: plasma - disrupts @ 0.633 EF1L loses its gates @ about .5 - crowbars @ .55
Feb 8 1995 11:29:50:900AM	950208010	John Goetz	Shot 950208010: EF1 test shot - PLC control Results: looks o.k.
Feb 8 1995 11:49:34:600AM	950208011	John Goetz	Shot 950208011: no changes Results: plasma - disr. @ 0.6sec EF1L loses its gates again
Feb 8 1995 12:04:51:230PM	950208012	John Goetz	Shot 950208012: delay ZXL gain switch until 0.125sec Results: plasma - disr. @ 1.45 H-mode transition @ .12MW (in and out and in)
Feb 8 1995 12:38:18:920PM	950208013	John Goetz	Shot 950208013: move ZXL gain switch until 0.11sec NL_04 = 0.5e20 PG3 = 19V from 0.6 to 1.0sec Results: Dud OH2 imbalance of 10kA - OH2L problems @ -0.8 OH2U and OH1 didn't commutate
Feb 8 1995 12:45:47:270PM	950208014	John Goetz	Shot 950208014: NL_04 gain notch from 0.5 to 1.0 Results: plasma - disr. @ 1.43 no H-mode many DAQ1 errors
Feb 8 1995 12:59:08:960PM	950208015	John Goetz	Shot 950208015: PG3 = 23V Results: plasma - disr. @ 1.45 density rising to 0.6e20 H-mode @ 0.44MW
Feb 8 1995 01:09:29:230PM	950208016	John Goetz	Shot 950208016: PG3 = 21.5V Results: plasma - disr. @ 1.43 density -> 3e19 thru shot no H-mode
Feb 8 1995 01:22:57:060PM	950208017	John Goetz	Shot 950208017: PG3 = 22.5V -> 22 -> 21.5 thru feedback window Results: plasma - disr. @ 1.43 NL_04->0.64e20 H-mode transition
Feb 8 1995 01:37:34:390PM	950208018	John Goetz	Shot 950208018: PG3 = 23V->18V thru feedback window P gain on ZCUR(W2) = 1.5 @ 1.2sec Results: plasma - disr. @ 1.08 no RF pulses during flat-top - no H-mode RF pulse @ 1.0 sec
Feb 8 1995 01:53:56:700PM	950208019	John Goetz	Shot 950208019: no changes Results: plasma - disr. @ 1.43 NL_04 = 0.34e20 no H-mode with RF->1.2MW
Feb 8 1995 02:01:57:740PM	950208020	John Goetz	Shot 950208020: no changes Results: plasma - disr. @ 1.09 NL_04=0.33e20 RF->1.2MW; no H-mode
Feb 8 1995 02:18:22:550PM	950208021	John Goetz	Shot 950208021: PG3 ramp from 23V to 21V turn on NL_04 feedback Results: plasma - disr. @ 1.07 NL_04 = 0.5e20 no H-mode; RF->1.0MW
Feb 8 1995 02:53:09:630PM	950208022	John Goetz	Shot 950208022: P gain on NL_04 = 4 Results: fizzle - no current channel forms
Feb 8 1995 02:59:58:360PM	950208023	John Goetz	Shot 950208023: NL_04 = 1.5e20 P_0 = 1.6e-5 Results: plasma - disr. @ 1.42 NL_04 doesn't reach flat-top until 0.75 no H-mode
Feb 8 1995 03:13:51:500PM	950208024	John Goetz	Shot 950208024: NL_04 = 1.1e20 Results: plasma - disr. @ 1.43 NL_04 flat from 0.4 on H-mode transition @ 0.7sec ( RF = 2.3MW )
Feb 8 1995 04:05:45:170PM	950208025	John Goetz	Shot 950208025: NL_04 = 0.9e20 Results: plasma - disr. @ 1.45 dithering H-mode ( 1MW RF )
Feb 8 1995 04:18:14:870PM	950208026	John Goetz	Shot 950208026: NL_04 = 1.0e20 Results: plasma - disr. @ 1.44 dithering H-mode
Feb 8 1995 05:01:14:490PM	950208027	John Goetz	Shot 950208027: no changes Results: plasma - disr. @ 1.44 part of SCSI and DAQ1 CAMAC are lost
Feb 8 1995 05:02:16:370PM	950208028	John Goetz	Shot 950208028: no changes Results: plasma - disr. @ 1.45 dithering and ELMy H-mode ( RF=1.4MW for ELMy )
Feb 8 1995 05:54:32:450PM	950208029	John Goetz	Shot 950208029: Li pellets at 0.53 and 0.8sec NL_04 feedback off from 0.6 to 1.0 PG3=30V from 0.5 to 1.0sec with notches for pellets Results: plasma - disr. @ 1.32 no RF; no pellets

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:29:37:300AM	Plasma	Ok	no faults, plasma
2	08:52:59:980AM	Plasma	Ok	no faults, plasma
3	09:08:07:830AM	Plasma	Ok	comm fault ef1L, plasma
4	09:26:55:770AM	Plasma	Ok	comm. fault, plasma ef1
5	09:44:27:660AM	Plasma	Ok	oh2U comm. fault after plasma
6	09:58:41:970AM	Plasma	Ok	no faults, plasma
7	10:20:23:780AM	Plasma	Ok	comm. fault, ef1L appears to have l0st gates
8	10:35:37:030AM	Plasma	Ok	comm. fault, ef1L, plasma disrupt
9	10:51:50:230AM	Plasma	Ok	no gates ef1 upper
10	11:25:39:690AM	Plasma	Ok	ef1u,l test--O.K.
11	11:36:16:990AM	Plasma	Ok	comm fault ef1l
12	11:51:07:350AM	Plasma	Ok	comm fault oh2u after plasma
13	12:10:07:920PM	Plasma	Ok	no faults, no plasma
14	12:37:54:450PM	Plasma	Ok	no faults ploasma
15	12:47:46:900PM	Plasma	Ok	no faults plasma
16	12:58:01:850PM	Plasma	Ok	comm fault, no data
17	01:14:03:950PM	Plasma	Ok	comm fault, oh2u plasma
18	01:24:55:050PM	Plasma	Ok	no faults, plasma
19	01:37:20:100PM	Plasma	Ok	no faults, plasma
20	01:52:50:000PM	Plasma	Ok	no faults, plasma
21	02:08:01:460PM	Plasma	Ok	no fault, plasma
22	02:29:59:580PM	Plasma	Ok	no faults
23	02:52:09:990PM	Plasma	Ok	faults, p[lasma
24	03:08:13:410PM	Plasma	Ok	no faults, plasma
25	03:28:43:870PM	Plasma	Ok	no faults, plasma
26	04:09:34:520PM	Plasma	Ok	no fault, plasma
27	04:20:50:520PM	Plasma	Ok	no faults, plasma
28	04:34:47:500PM	Plasma	Ok	no faults, plasma
29	05:02:30:910PM	Plasma	Ok	no faults, plasma