Miniproposals

Miniproposal: 113 Date Filed: 4/13/1995 Title: Impurity Puffing to Induce the Detached Divertor Condition in First Author: Steve Golovato Session Leader: Bruce Lipschultz (shots 1-46)

Engineering Operator Run Comment

goetz

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:15:570PM

Author: To Be Determined

run # 960227 Engineering Operator:V. Bertolino Physics Operator:J. Goetz Session leader:B. Lipschultz The aim of today's run was to achieve dissipative divertor operation with H-mode RF-heated plasmas. During the run - 960209 we tried using both D2 and Ne puffing to increase the divertor radiation. The D2 puffing did increase the divertor pressure but had little effect on the other divertor parameters. With Ne we were somewhat more successful in that the separatrix region dropped in Te and was on the verge of detachment. Unfortunately the change in divertor conditions was brought about by changes in the PSOL from Ne radiation from inside the separatrix. Let me also mention that the piggyback for today's run was killer pellets. I believe that gold pellets were completely unsuccessful in that no gold got in the plasma. Silver-doped pellets were more successful but there were timing difficulties. Speak to RSG for further details. We were mostly successful with the aims of today's run. We did achieve detachment using N2 injection. However, we were not able to create a dissipative divertor without detaching similar to pre-boronization days where the radiation from outside the separatrix was comparable to that from inside the separatrix. The good news is that detachment was achieved with good core confinement. The bad news is that the core plasma is pretty 'dirty' and screening of impurities clearly worsens as detachment proceeds. The detachment was primarily achieved both by reducing the power flowing into the SOl and by increasing the divertor radiation. This is demonstrated by the difference between Ne (or Ar) and N in the ability to cause detachment. Ne (or Ar) caused radiation in the core. The first part of the run was devoted to determining the usabilty of Ne and Ar for the purpose discussed above. The main effect of using these gases was to raise the radiation from the main plasma, not from the divertor. In addition we found that we could not cause significant plasma pressure loss at the divertor surface (as measured by the probes). The main effect in the divertor was a slight rearrangement of the pressure profile. As a final note to this part of the day the data from Ar and Ne injection into H-mode plasmas is new and will supply valuable information about screening for those plasmas. After finishing with Ne and Ar we then proceeded to puff N2 through the divertor floor capillaries. We slowly raised the fill pressure and the number of capillaries until shot 18 where, with 4 valves, we measured a significant loss of plasma pressure at the outer divertor plate. For shot 19 we did not include the notch in the RF power (included to allow an FSP scan during the H-mode and before the puff). This provided one of the best confinement shots with an H-factor of ~ 1.7-1.8 and stored energy of ~ 200 kJ. We then proceeded to scan the UV spectrum with the McPherson viewing the x-point to learn what was radiating there. The Chromex was also scanned to look at N-I, N-II and N-III. The McPherson data indicated that N was a strong radiator near the x-point with N-II through N-VII (H-like) contibuting. The existence of H-like N radiation indicates a high Te of ~ 250 eV in that region. Part of the remainder of the run was spent minimizing the amount of N2 injected to try and maximize the radiation outside the separatrix compared to inside and perhaps make a non-detached dissipative divertor. This was unsuccessful. We then went on to try and raise the initial (pre-RF) plasma density in order to possibly maximize the divertor radiation. There may have been a slight amount of success here in that for shot 46 the radiation outside the separatrix reached 1.1 MW compared to 2.7 MW inside the separatrix. A number of additional points can be made: (1) The addition of prodigious amounts of N lead to an increase of core radiation of ~ 1 MW but had little or no effect on core confinement. This was not neccesarily true for Ne or Ar (2) The core confinement was unaffected by detachment (3) Detachment was typically slow, taking of order 100 ms for the pressure loss at the divertor plate to level out. The temperatures at the plate dropped to ~ 2 eV in regions below the nose except for the separatrix where Te ranged from 5-10 eV. At the separatrix the main effect was that the density dropped leading to large pressure losses (10-40). This is in contrast to our past results where the Te dropped below 5 eV before the density dropped as the plasma detached. In all of this we must express some reservation about the pressure loss being called detachment in that we have not analyzed the upstream data yet. It is possible that the pressure upstream could have dropped by such large factors as well. (4) Record high levels of stored energy and neutrons were achieved. This was due to the increase in RF power that was achieved today. The H-factors were less than 2 typically. (5) These detached plasmas were accompanied by the usual increase in core radiation and core impurity levels brought on by reduced screening. The delta_Zeff as determined from Z_67 was ~ .6 comparing shots 19 (detachment) and 21 (no N2 puff). The increase in core radiation was ~ 1MW primarily due to the N. There was also an increase in Mo radiation, probably also due to poorer screening as opposed to higher source. (6) As a first analysis of the degradation of screening due to detachment, Jim T. has compared shots 20 (background, no N puff)), 35 (3.5 torr injected) and 36 (10 torr injected). What he found was the following: Shot N VII signal (AU) delta N (signal) ---- ---------------- --------------- 20 1.5 0 35 1.75 .25 36 5.5 4.0 The Mo brightness was constant over these shots thus reducing the concern over the fraction of the N VII signal it may be contributing to. Since 3 times as much N is puffed on shot 36 as 35 and 36 detached we infer that ~ 5 times more N penetrates when the divertor is detached compared to the non-detached case. (7) Typical division of radiation inside to outside the separatrix can be seen from shots 19 (detached) and 22. Shot Prad (inside sep) Prad (outside sep.) puff ---- ---------------- ------------------ ---- 19 3.1 MW 1.0 N2 puff 22 1.8 MW .7 no puff Thus the radiated fraction outside the separatrix was pretty poor. Shot 46 was slightly better. A shot by shot summary follows: shot # 1: test shot # 2: power supply fault shot # 3: fiducial, all looks normal shot # 4: 1 MA with 2.1 MW RF. Initial density before RF nl04=1.25 rising to 2.2-2.3 e20. Sored energy 169 at peak and doesn't loose any energy after RF power notch at .8 seconds. shot # 5: Ne puff trigger at .7 seconds for 150 ms. B30-012 and K30-012 capillaries used with 270 torr (5.1 psi). 3 torr puffed. Ne gets in sometime between .92 (div bolos and .96 seconds (McPherson). No sign of any effect on divertor plasma. Disruption at 1.1 seconds programmed for the killer pellets. 170 kJ stored energy. shot # 6: Ne puff trigger at .6 seconds for 150 ms. B30-012 and K30-012 capillaries used with 270 torr (5.1 psi). 3 torr puffed. Ne gets in sometime between .82 (div bolos and .86 seconds (McPherson). No sign of any effect on divertor plasma parameters. Disruption at 1.1 seconds programmed for the killer pellets. 170 kJ stored energy. shot # 7: Ne puff trigger at .55 seconds for 100 ms. B30-012, H30-012, D30-012 and K30-012 capillaries used with 270 torr (5.1 psi). 5 torr puffed. Ne gets in sometime between .82 (div bolos and .86 seconds (McPherson). Divertor Te's drop to 2 eV in the separatrix/private flux region. Radiation in the core rises to almost 3 MW reducing PSOL. Disruption at 1.1 seconds programmed for the killer pellets. 170 kJ stored energy. shot # 8: Ne puff trigger at .55 seconds for 100 ms. B30-012, H30-012, D30-012 capillaries used with 270 torr (5.1 psi). 4 torr puffed. Ne gets in sometime between .82 (div bolos and .86 seconds (McPherson). Divertor Te's drop to 2 eV in the separatrix/private flux region. Radiation in the core rises to almost 3 MW reducing PSOL. shot # 9: Switch to Ar puff w/trigger at .55 seconds for 100 ms. B30-012 capillaries used with 234 torr (4.5 psi). 1.5 torr puffed. Ar gets in sometime between .82 (div bolos and .86 seconds (McPherson). Divertor Te's drop to 2 eV in the separatrix/private flux region. Very similar to Ne puff. Perhaps too much Ar because the stored energy drops from 200 to 130 kJ. The RF power has steadily risen to 2.8 MW. Killer pellet went in but at the wrong time. shot # 10: Switch to Ar puff w/trigger at .55 seconds for 100 ms. B30-012 capillaries used with 133 torr (2.15 psi). .5 torr puffed. Ar gets in sometime between .92. Very little effect on the divertor but because of the lower pressure the gas came in late. The RF didn't get in the full power as well. Repeat with 3 valves and 100 ms earlier puff time. Killer pellet successfull. shot # 11: Ar puff w/trigger at .45 seconds for 100 ms. B30-012, D30 and K30 capillaries used with 133 torr (2.15 psi). 2 torr puffed, Ar gets in sometime around .82 seconds. Getting some Te drop and rearrangement of the pressure profile in the divertor. killer pellet failed? shot # 12: No impurity puff, shot disrupted because of power supply problems. shot # 13: no impurity puff, background shot. stored energy 170 kJ, RF power 2.8 and dropping. shot # 14: First N2 puff through B30-012. Fill pressure 360 torr, trigger at .5 seconds for .1 seconds. McPherson measures increase over background at ~ .8 seconds of 1 (a.u.). Small amount of Te decrease in the divertor. shot # 15: shot failure. shot # 16: N2 puff through 2 valves, B30 and H30-012. 360 torr fill with 4 torr injected. Triggered at .5 seconds for .1 seconds. No different than shot 14, little effect in the divertor, same level in the core. shot # 17: N2 puff through 2 valves, B30 and H30-012. 570 torr fill (11.26 psi) with 7 torr injected. Triggered at .5 seconds for .1 seconds. It appears to come in early (based on divertor pressure) at .75 seconds. The plasma drops out of H-mode during RF notch but recovers. The radiated power in the divertor has been creeping up from 600 to 800 kW but still no large effects on the plasma profile other than a rearrangement of pressure. shot # 18: N2 puff through 4 valves, B30, D30, K30 and H30-012. 570 torr fill(11.26 psi) with 13.7 torr injected. Triggered at .5 seconds for .1 seconds. It appears to come in at .8 seconds. Stored energy drops from 200 to 165 kJ for P_RF of 3.2 to 2.7 MW. This plasma was definately detached with over 1MW divertor radiation! The detachment occurs at ~ .8 seconds. The NVII level reaches 6 au in the core. shot # 19: No notch in the RF power. N2 puff through 4 valves, B30, D30, K30 and H30-012. 570 torr fill(11.26 psi) with 13.7 torr injected. Triggered at .5 seconds for .1 seconds. Detached again, the divertor Isat starts dropping at .8 seconds. The stored energy starts at 200 kJ and drops through the RF pulse to of order 180 kJ - no notch. The stored energy is not degraded by detachment! However, the N2 puff does have some effect on confinement independent of detachment. shot #20: 3 valves used, B,D and H30-012 with the same N2 settings. Slow detachment starting around .8 seconds. The notch at .75 seconds causes the H-mode to go away temporarily. shot # 21: No N2 puff. Notch in the RF power at .75 seconds. No detachment. The stored energy starts at 185 kJ and drops during the notch but recovers afterwards. Big Mo injection detaches the plasma at .92 seconds. shot # 22: No N2 puff. Notch in the RF power at .75 seconds. No detachment. The stored energy starts at 185 kJ and drops during the notch but recovers afterwards. shot # 23: N2 puff back on through 3 valves, 554 torr fill, triggered at .62 seconds for 100 msec. 10 torr injected. Notch in the RF power at .75 seconds. The stored energy drops with the notch but recovers. However, there is a large ELM-like occurence at .93 seconds when P_rad reaches 3 MW and the divertor is detached. After the ELM the radiated power (core) drops and the divertor plasma gradually reattaches. shot # 24: constant shots: N2 puff through 3 valves, 554 torr fill, triggered at .62 seconds for 100 msec. 10 torr injected. Notch in the RF power at .75 seconds. detaching slowly starting at around .75 - .8 seconds. shot # 25: constant shots: N2 puff through 3 valves, 554 torr fill, triggered at .62 seconds for 100 msec. 10 torr injected. Notch in the RF power at .75 seconds. detaching slowly starting at around .75 - .8 seconds. shot # 26: constant shots still. shot # 27: constant shots still. Rf partially trips at .9 seconds. shot # 28: constant shots still. shot # 29: constant shots still. shot # 30: constant shots still. Chromex switched to look at fiducial spectrum. shot # 31: disruption at .43 seconds shot # 32: disruption again shot # 33: This one made it to 1.1 seconds. However, the RF trips out partially and we are down to 1.5 MW. The divertor is detached after about .9 seconds. shot # 34: The usual 3 capillary puffs in the floor delivering 9.4 torr to machine. Detachment starts at .8 seconds. Notch at .9 seconds followed shortly by drop out of H-mode. H-mode starts up again after dumping impurities out of the plasma. During this second period the power flowing into the SOl is high, ~ 2MW and the divertor plasma appears to still be detached. shot # 35: Puff through capillary at B16-001. Fill pressure is 568 torr with 3.5 torr delivered to the tokamak. No apparent detachment. shot # 36: Background shot, no N2. Record neutron level - 1.3e14. shot # 37: disruption Shot # 38: Puff through capillaries at B16-001 (inner wall), B33-001 (outer wall) and B31-38 (outer divertor). Fill pressure is 568 torr with 10.35 torr delivered to the tokamak. Detached until the notch when all the impurities are dumped out of the core. When the RF starts up again we get more power flowing into the SOl and the divertor plasma reattaches. Shot # 39: Puff through capillaries at B30-001 and H30-001 (both floor capillaries). Fill pressure is 568 torr with 7.4 torr delivered to the tokamak. This one appears to detach around .87 seconds, just before the notch. Shot # 40: Puff through capillaries at B30-001 and H30-001 (both floor capillaries). Fill pressure is 568 torr with 7.4 torr delivered to the tokamak. No notch on this shot. Have problems with probe data. detachment at .88 seconds. Shot # 41: Puff through capillaries at B30-001 and H30-001 (both floor capillaries). Fill pressure is 568 torr with 7.4 torr delivered to the tokamak. No notch on this shot. Got probe data. McPherson NVII signal magnitude is 2e14 ph/ster/s/cm^2 at the time of detachment for shgts 19, 40 39 and 41. We will check other shots as well to confirm this. These shots had different times of detachment. Shot # 42: Puff through capillaries at B30-001 and H30-001 (both floor capillaries). Fill pressure is 568 torr with 7.4 torr delivered to the tokamak. No notch on this shot. RF pulse off at .95 seconds. Detached by that time as well. Shot # 43: Puff through capillaries at B30-001 and H30-001 (both floor capillaries). Fill pressure is 568 torr with 7.4 torr delivered to the tokamak. No notch on this shot. RF pulse off at .95 seconds. Detached at .93 seconds. Stored energy reaches 215 kJ and Steve W. says 'record neutron rate' of 1.31e14. Shot # 44: Puff through capillaries at B30-001 and H30-001 (both floor capillaries). Fill pressure is 6168 torr with 8.7 torr delivered to the tokamak. D transmitter shuts off at .71 seconds so not a good test. Starts deteching around .84 seconds. Shot # 45: Puff through capillaries at B30-001 and H30-001 (both floor capillaries). Fill pressure is 616 torr with 8.7 torr delivered to the tokamak. Starts deteching around .88 seconds slowly dropping the pressure until the end of the RF pulse. Shot # 46: Puff through capillaries at B30-001, D30-001 and H30-001 (both floor capillaries). Fill pressure is 570 torr with 11 torr delivered to the tokamak. nl04 ~

Entered: Jul 7 2004 03:49:15:600PM

Author: To Be Determined

1.4w20 at start of rf rising to 2.3 during rf and 2.7 during detachment. Starts deteching around .82 seconds slowly dropping the pressure until the end of the RF pulse.

Physics Operator Summaries

Entered: Jul 7 2004 04:36:56:287PM

Author: To Be Determined

Physics operator summary for 960227 EO: Bertolino / Silva / Daigle PO: Goetz SL: Lipschultz Run 960227 was in support of Mini-Proposal #113 - Impurity Puffing to Induce the Detached Divertor Condition in High Power RF Heated Discharges. The goals of this Mini-Proposal are (1) to determine the amount and type of puffed impurities required for divertor detachment at high RF powers and (2) to survey the conditions under which H-modes and divertor detachment exist to see if they can be made compatible. Piggy-backing experiment today was Mini-Proposal # 87 - Killer Pellets and these experiments were run until shot 016. Plan: fiducial setup plasma with high SOL power - preferably ELMy H-mode puff deuterium through the floor tiles to try and detach the divertor if successful then characterize the SOL and divertor with the FSP, McPherson, and Chromex if not successful then puff neon, argon, and nitrogen through B_SIDE until the divertor detaches, then characterize the FSP, McPherson, and Chromex. puff neon, argon, and nitrogen through the floor tiles to try and detach the divertor. Characterize the SOL and divertor plasmas with the FSP, McPherson, and Chromex. if a completely detached H-mode (CDH) is achieved, attempt to optimize The plan was carried out. The impurity gases neon, argon, and nitrogen were puffed at H-mode plasmas. Detachment of the divertor was observed but scanning probe confirmation is still awaited. See the Session Leader's report for a detailed discussion of the physics results. Some things discovered today: 1) All attempts that had fields had plasma. Shots early in the day had very fast current rises and resulted in molybdenum influxes at the segment swich. Raising the gas in segment 1 got rid of the overshoot in the current but this lasts for only one shot. The next shot, this 'rub' was back. After the 'Killer Pellets' part of the run was over, and the disruptions were no longer occuring at 1MA, the current rises were just right. 2) The radial field offset used was +.0055mT and 14msec of prefill puff was used all day. 3) Four plasmas disrupted early. Three of these disruptions ( 031, 032, and 037) are presently being blamed on the RF scanning probe. The probe operator insists that the probe was well behind the limiter, but doubts remain. The other disruption was caused by OH1 not coming out of crossover and thus the current rise glitch could not be overcome. 4) Many I_halo warnings were received today. Disruptions due to turn off of the vertical position control for 'Killer Pellet' studies and disruptions on ramp-down due to excess impurities were the rule of the day. The timing of the disruption was directly correlated with the amount of impurity being puffed. Raising the PLC limit on EF3 to 15kA did not help to alleviate these disruptions. Baseline shots ramped all the way down. As seen from point 1) above, recovery from disruptions was not a problem. 5) Several records were achieved today: Total neutrons produced Highest stored energy Highest neutron rate Highest power on D-port antenna in a long, long time. Therefore, puffing impurities at the plasma is a good thing. Engineering, computing, and diagnostics today: Shot 1 was a test of the TF under PLC control. Two shots were lost today. Shot 002 had the PF breaker pull prior to the shot due to a shoot-thru in EF4 and shot 015 was lost due to and ACK failure. No DAQ problems today but Thomson was suffering from the same problems as last week. Scorecard: 46 shots = 43 plasmas + 0 fizzles + 1 tests + 2 duds Shot summary for Run 960227: Load 960209034 BR_0 = .0055 prefill puff = 14msec coldstart hybrid - all matrices respond Shot change result ____ _____ ______ 1 PLC test of TF o.k. 2 fiducial from 960209011, BR_0 EF4 IOC shoot-thru before the shot =.0055; prefill puff = 14msec 3 try 2 again acceptable fiducial 4 load 960209034; BR_0=.0055; plasma; all the way down; good baseline prefill puff = 14msec 5 turn off gains on ZCUR @ 1.08 plasma; disrupts @ 1.11sec and goes up on wires 2 & 3; puff 270Torr neon in after 0.92sec of neon thru B30-012 & K30-012 @ 0.7sec for 0.15sec 6 puff neon at 0.6sec plasma; disrupts @ 1.10; neon in @ 0.85 7 puff neon @ 0.55 for 0.1sec plasma; disrupts @ 1.10; neon in @ 0.82 from all 4 floor valves detach @ 0.92; out of H @ 0.99 8 puff neon from B,D, H30-012 plasma; disrupts @ 1.10; in and out of H-mode 9 puff 235 Torr of argon from plasma; disrupts @ 1.10; pellet timing B30-012 @ 0.55sec for 0.1sec wrong; current rising too quickly enable LPI for Ag pellet 10 puff 130Torr of argon; add plasma; disrupts @ 1.09; current still some PG3 in segment 1 rising too quickly; 11 more PG3 in segment 1; puff plasma; disrupts @ 1.11; current rise from B30-012, D30-012, K30-012 glitch is gone 12 no puffing in the divertor plasma; disrupts @ 0.25; current rise glitch is back; OH1 never comes out of crossover 13 more PG3 in segment 1 plasma; disrupts @ 1.11 14 puff 360Torr of nitrogen thru plasma; disrupts @ 1.10; current rise B30-012 for 0.1sec @ 0.50sec glitch is back; some N2 seen 15 more PG3 in segment 1; puff dud; ACK failure thru B30-012 and H30-012 16 try again plasma; disrupts @ 1.09; current rise rub still observed 17 load wires 2 & 3 from shot 004; plasma; disrupts @ 1.42; more nitrogen ZXL changes (+1mm @ 0.8; +2mm in but too early; nice target @ 1.1); 570Torr of nitrogen; more PG3 in segment 1 18 more PG3 in segment 1; puff N2 plasma; disrupts @ 1.30; detached div. @ 0.62 and use 4 floor valves 19 remove notch in RF power plasma; disrupts @ 1.18; detached div. 20 notch in RF @ 0.75; puff thru plasma; disrupts @ 1.05; B30-012, D30-012, H30-012 21 no impurity puffing plasma; all the way down; no Chromex 22 repeat to get Chromex data plasma; all the way down; nice H-mode 23 puff thru B30-012, D30-012, plasma; disrupts @ 1.30; det. div @ 0.8? and H30-012 24 no changes plasma; disrupts @ 1.32; detdiv @ 0.8? 25 no changes plasma; disrupts @ 1.31; detdiv @ 0.8 26 remove notch in RF power plasma; disrupts @ 1.31; detdiv @ 0.82 27 no changes plasma; disrupts @ 1.23; detdiv @ 0.82 E-Port antenna trips after 0.91 28 no changes plasma; disrupts @ 1.23; detdiv @ 0.83 29 no changes plasma; disrupts @ 1.28; detdiv @ 0.83 30 no changes plasma; disrupts @ 1.30; detdiv @ 0.82 31 RF power notch @ 0.9 plasma; disrupts @ 0.4368; Mo inj @ 0.43 32 no changes plasma; disrupts @ 0.463; Mo inj @ 0.43 33 pull out RF probe plasma; disrupts @ 1.11; detdiv @ 0.88 34 no changes plasma; disrupts @ 1.32; no injections at all; detdiv @ 0.81 35 puff 570 Torr of N2 from plasma; all the way down; no detdiv B16-001 @ 0.62sec for 0.1sec 36 no puffing plasma; all the way down; good baseline 37 puff 570Torr of N2 from B16-001 plasma; disrupts @ 0.195; injections B31-038, and B33-001 @ 0.62 for beginning at 0.181 0.1sec 38 pull out RF probe plasma; disrupts @ 1.39; detdiv @ 0.81 39 puff from B30-012 and H30-012 plasma; disrupts @ 1.35; detdiv @ 0.89 40 remove RF power notch; ZXL up plasma; disrupts @ 1.33; detdiv @ 0.87 1mm @ 0.8 and 2mm @ 1.1 41 no changes plasma; disrupts @ 1.34; detdiv @ 0.87 42 turn off RF power @ 0.95 plasma; disrupts @ 1.35; detdiv @ 0.88 43 NL_04=1.5e20; more PG3 in seg2 plasma; disrupts @ 1.32; detdiv @ 0.93 44 NL_04=1.5e20 @ .375, more PG3 plasma; disrupts @ 1.29; detdiv @ 0.81 in seg2; 620Torr of N2 puffed D-port trips early 45 NL_04 = 1.5e20 @ .325sec plasma; disrupts @ 1.28; detdiv @ 0.89 46 puff 570Torr of N2 thru B30-012 plasma; disrupts @ 1.15; detdiv @ 0.85 D30-012, and H30-012 @ 0.62sec for 0.1sec

Session Leader Comments
Feb 27 1996 08:34:10:230AM		Bruce Lipschultz	run # 960227 Engineering Operator:V. Bertolino Physics Operator:J. Goetz Session leader:B. Lipschultz The aim of today's run is to achieve dissipative divertor operation with H-mode RF-heated plasmas. During the run - 960209 we tried using both D2 and Ne puffing to increase the divertor radiation. The D2 puffing did increase the divertor pressure but nad little effect on the other divertor parameters. With Ne we were somewhat more successful in that the separatrix region dropped in Te and was on the verge of detachment. Unfortunately the change in divertor conditions was brought about by changes in the PSOL from Ne radiation from inside the separatrix. Today we would like to try some new attacks: (1) puff Ne directly in the divertor with gas puff outside to increase flows into the divertor. (2) awitch to Ar and try the same. (3) switch to N2 and try the same. We do not plan to spend much time on Ne or Ar. We also plan to take care of the killer pellet piggyback early in the run.
Feb 27 1996 08:39:00:240AM	960227001	Bruce Lipschultz	shot # 1: test
Feb 27 1996 08:39:24:790AM	960227002	Bruce Lipschultz	shot # 2: power supply fault
Feb 27 1996 08:51:51:350AM	960227003	Bruce Lipschultz	shot # 3: fiducial, all looks normal
Feb 27 1996 09:17:37:350AM	960227004	Bruce Lipschultz	shot # 4: 1 MA with 2.1 MW RF. Initial density before RF nl04=1.25 rising to 2.2-2.3 e20. Sored energy 169 at peak and doesn't loose any energy after RF power notch at .8 seconds.
Feb 27 1996 09:17:47:540AM	960227004	Bruce Lipschultz	shot # 4: 1 MA with 2.1 MW RF. Initial density before RF nl04=1.25 rising to 2.2-2.3 e20. Sored energy 169 at peak and doesn't loose any energy after RF power notch at .8 seconds.
Feb 27 1996 09:36:50:740AM	960227005	Bruce Lipschultz	shot # 5: Ne puff trigger at .7 seconds for 150 ms. B30-012 and K30-012 capillaries used with 270 torr (5.1 psi). 3 torr puffed. Ne gets in sometime between .92 (div bolos and .96 seconds (McPherson). Disruption at 1.1 seconds programmed for the killer pellets. 170 kJ stored energy.
Feb 27 1996 10:16:37:780AM	960227007	Bruce Lipschultz	shot # 7: Ne puff trigger at .55 seconds for 100 ms. B30-012, H30-012, D30-012 and K30-012 capillaries used with 270 torr (5.1 psi). 5 torr puffed. Ne gets in sometime between .82 (div bolos and .86 seconds (McPherson). Divertor Te's drop to 2 eV in the separatrix/private flux region. Radiation in the core rises to almost 3 MW reducing PSOL. Disruption at 1.1 seconds programmed for the killer pellets. 170 kJ stored energy.
Feb 27 1996 10:37:28:000AM	960227008	Bruce Lipschultz	shot # 8: Ne puff trigger at .55 seconds for 100 ms. B30-012, H30-012, D30-012 capillaries used with 270 torr (5.1 psi). 4 torr puffed. Ne gets in sometime between .82 (div bolos and .86 seconds (McPherson). Divertor Te's drop to 2 eV in the separatrix/private flux region. Radiation in the core rises to almost 3 MW reducing PSOL.
Feb 27 1996 10:56:20:540AM	960227009	Bruce Lipschultz	shot # 9: Switch to Ar puff w/trigger at .55 seconds for 100 ms. B30-012 capillaries used with 234 torr (4.5 psi). 1.5 torr puffed. Ar gets in sometime between .82 (div bolos and .86 seconds (McPherson). Divertor Te's drop to 2 eV in the separatrix/private flux region. Very similar to Ne puff. Perhaps too much Ar because the stored energy drops from 200 to 130 kJ. The RF power has steadily risen to 2.8 MW. Killer pellet went in but at the wrong time.
Feb 27 1996 11:12:47:180AM	960227010	Bruce Lipschultz	shot # 10: Switch to Ar puff w/trigger at .55 seconds for 100 ms. B30-012 capillaries used with 133 torr (2.15 psi). .5 torr puffed. Ar gets in sometime between .82 (div bolos and .86 seconds (McPherson). Very little effect on the divertor but because of the lower pressure the gas came in late. The RF didn't get in the full power as well. Repeat with 3 valves and 100 ms earlier puff time.
Feb 27 1996 11:30:03:930AM	960227011	Bruce Lipschultz	shot # 11: Ar puff w/trigger at .45 seconds for 100 ms. B30-012, D30 and K30 capillaries used with 133 torr (2.15 psi). 2 torr puffed, Ar gets in sometime around .82 seconds. Getting some Te drop and rearrangement of the pressure profile in the divertor.
Feb 27 1996 11:59:15:830AM	960227012	Bruce Lipschultz	shot # 12: No impurity puff, shot disrupted because of power supply problems.
Feb 27 1996 12:06:37:880PM	960227013	Bruce Lipschultz	shot # 13: no impurity puff, background shot. stored energy 170 kJ, RF power 2.8 and dropping.
Feb 27 1996 12:24:37:550PM	960227014	Bruce Lipschultz	shot # 14: First N2 puff through B30-012. Fill pressure 360 torr, trigger at .5 seconds for .1 seconds. McPherson measures increase over background at ~ .8 seconds of 1 (a.u.). Small amount of Te decrease in the divertor.
Feb 27 1996 12:25:06:130PM	960227015	Bruce Lipschultz	shot # 15: shot failure.
Feb 27 1996 12:42:54:920PM	960227016	Bruce Lipschultz	shot # 16: N2 puf through 2 valves, B30 and H30-012. 360 torr fill with 4 torr injected. Triggered at .5 seconds for .1 seconds. No different than shot 14, little effect in the divertor, same level in the core.
Feb 27 1996 12:50:22:820PM	960227016	Bruce Lipschultz	shot # 16: N2 puf through 2 valves, B30 and H30-012. 360 torr fill with 4 torr injected. Triggered at .5 seconds for .1 seconds. No different than shot 14, little effect in the divertor, same level in the core.
Feb 27 1996 01:30:23:210PM	960227017	Bruce Lipschultz	shot # 17: N2 puff through 2 valves, B30 and H30-012. 570 torr fill (11.26 psi) with 7 torr injected. Triggered at .5 seconds for .1 seconds. It appears to come in early (based on divertor pressure) at .75 seconds. The plasma drops out of H-mode during RF notch but recovers. The radiated power in the divertor has been creeping up from 600 to 800 kW but still no large effects on the plasma profile other than a rearrangement of pressure.
Feb 27 1996 01:46:18:490PM	960227018	Bruce Lipschultz	shot # 18: N2 puff through 4 valves, B30, D30, K30 and H30-012. 570 torr fill(11.26 psi) with 13.7 torr injected. Triggered at .5 seconds for .1 seconds. It appears to come in at .8 seconds. Stored energy drops from 200 to 165 kJ for P_RF of 3.2 to 2.7 MW. This plasma was definately detached with over 1MW divertor radiation! The NVII level reaches 6 au in the core.
Feb 27 1996 02:20:03:800PM	960227019	Bruce Lipschultz	shot # 19: No notch in the RF power. N2 puff through 4 valves, B30, D30, K30 and H30-012. 570 torr fill(11.26 psi) with 13.7 torr injected. Triggered at .5 seconds for .1 seconds. Detached again, the divertor Isat starts dropping at .8 seconds. The stored energy starts at 200 kJ and drops through the RF pulse to of order 180 kJ - no notch. The stored energy is not degraded by detachment! However, the N2 puff does have some effect on confinement independent of detachment.
Feb 27 1996 03:01:20:120PM	960227022	Bruce Lipschultz	shot # 22: No N2 puff. Notch in the RF power at .75 seconds. No detachment. The stored energy starts at 185 kJ and drops during the notch but recovers afterwards.
Feb 27 1996 03:21:05:150PM	960227023	Bruce Lipschultz	shot # 23: N2 puff back on through 3 valves, 554 torr fill, triggered at .62 seconds for 100 msec. 10 torr injected. Notch in the RF power at .75 seconds. The stored energy drops with the notch but recovers. However, there is a large ELM-like occurence at .93 seconds when P_rad reaches 3 MW and the divertor is detached. After the ELM the radiated power (core) drops and the divertor plasma gradually reattaches.
Feb 27 1996 03:43:29:940PM	960227024	Bruce Lipschultz	shot # 24: constant shots: N2 puff through 3 valves, 554 torr fill, triggered at .62 seconds for 100 msec. 10 torr injected. Notch in the RF power at .75 seconds. detaching slowly starting at around .75 - .8 seconds.
Feb 27 1996 03:48:02:450PM	960227025	Bruce Lipschultz	shot # 25: constant shots: N2 puff through 3 valves, 554 torr fill, triggered at .62 seconds for 100 msec. 10 torr injected. Notch in the RF power at .75 seconds. detaching slowly starting at around .75 - .8 seconds.
Feb 27 1996 03:48:41:960PM	960227026	Bruce Lipschultz	shot # 26: constant shots still.
Feb 27 1996 04:20:43:250PM	960227026	Bruce Lipschultz	shot # 26: constant shots still.
Feb 27 1996 04:20:54:820PM	960227027	Bruce Lipschultz	shot # 27: constant shots still.
Feb 27 1996 04:21:08:370PM	960227028	Bruce Lipschultz	shot # 28: constant shots still.
Feb 27 1996 04:30:58:710PM	960227029	Bruce Lipschultz	shot # 29: constant shots still.
Feb 27 1996 04:42:51:420PM	960227030	Bruce Lipschultz	shot # 30: constant shots still.
Feb 27 1996 05:07:07:000PM	960227031	Bruce Lipschultz	shot # 31: disruption at .43 seconds
Feb 27 1996 05:31:15:140PM	960227032	Bruce Lipschultz	shot # 32: disruption again
Feb 27 1996 05:43:26:420PM	960227033	Bruce Lipschultz	shot # 33: This one made it to 1.1 seconds. However, the RF trips out partially and we are down to 1.5 MW. The divertor is detached after about .9 seconds.
Feb 27 1996 05:58:28:220PM	960227034	Bruce Lipschultz	shot # 34: The usual 3 capillary puffs in the floor delivering 9.4 torr to machine. Detachment starts at .8 seconds. Notch at .9 seconds followed shortly by drop out of H-mode. H-mode starts up again after dumping impurities out of the plasma. During this second period the power flowing into the SOl is high, ~ 2MW and the divertor plasma appears to still be detached.
Feb 27 1996 06:08:02:380PM	960227035	Bruce Lipschultz	shot # 35: Puff through capillary at B16-001. Fill pressure is 568 torr with 3.5 torr delivered to the tokamak. No apparent detachment.
Feb 27 1996 06:37:12:690PM	960227036	Bruce Lipschultz	shot # 36: Background shot, no N2.
Feb 27 1996 06:47:51:820PM	960227037	Bruce Lipschultz	shot # 37: disruption
Feb 27 1996 07:04:18:700PM	960227038	Bruce Lipschultz	Shot # 38: Puff through capillaries at B16-001 (inner wall), B33-001 (outer wall) and B31-38 (outer divertor). Fill pressure is 568 torr with 10.35 torr delivered to the tokamak. Detached until the notch when all the impurities are dumped out of the core. When the RF starts up again we get more power flowing into the SOl and the divertor plasma reattaches.
Feb 27 1996 07:20:34:530PM	960227039	Bruce Lipschultz	Shot # 39: Puff through capillaries at B30-001 and H30-001 (both floor capillaries). Fill pressure is 568 torr with 7.4 torr delivered to the tokamak. This one appears to detach around .87 seconds, just before the notch.
Feb 27 1996 07:32:31:340PM	960227040	Bruce Lipschultz	Shot # 40: Puff through capillaries at B30-001 and H30-001 (both floor capillaries). Fill pressure is 568 torr with 7.4 torr delivered to the tokamak. No notch on this shot. Have problems with probe data.
Feb 27 1996 08:08:17:240PM	960227041	Bruce Lipschultz	Shot # 41: Puff through capillaries at B30-001 and H30-001 (both floor capillaries). Fill pressure is 568 torr with 7.4 torr delivered to the tokamak. No notch on this shot. Got probe data. McPherson NVII signal magnitude is 2e14 ph/ster/s/cm^2 at the time of detachment for shgts 19, 40 39 and 41. We will check other shots as well to confirm this. These shots had different times of detachment.
Feb 27 1996 08:25:19:630PM	960227043	Bruce Lipschultz	Shot # 43: Puff through capillaries at B30-001 and H30-001 (both floor capillaries). Fill pressure is 568 torr with 7.4 torr delivered to the tokamak. No notch on this shot. RF pulse off at .95 seconds. Detached by that time as well. Stored energy reaches 215 kJ and Steve W. says 'record neutron rate'.
Feb 27 1996 08:44:45:240PM	960227044	Bruce Lipschultz	Shot # 44: Puff through capillaries at B30-001 and H30-001 (both floor capillaries). Fill pressure is 6168 torr with 8.7 torr delivered to the tokamak. D transmitter shuts off at .71 seconds so not a good test. Starts deteching around .84 seconds.
Feb 27 1996 09:00:17:540PM	960227045	Bruce Lipschultz	Shot # 45: Puff through capillaries at B30-001 and H30-001 (both floor capillaries). Fill pressure is 616 torr with 8.7 torr delivered to the tokamak. D transmitter shuts off at .71 seconds so not a good test. Starts deteching around .88 seconds slowly dropping the pressure until the end of the RF pulse.

Physics Operator Comments
Feb 27 1996 08:04:53:630AM		John Goetz	Run 960227 was in support of Mini-Proposal #113 - Impurity Puffing to Induce the Detached Divertor Condition in High Power RF Heated Discharges. The goals of this Mini-Proposal are (1) to determine the amount and type of puffed impurities required for divertor detachment at high RF powers and (2) to survey the conditions under which H-modes and divertor detachment exist to see if they can be made compatible. Plan: fiducial setup plasma with high SOL power - preferably ELMy H-mode puff deuterium through the floor tiles to try and detach the divertor if successful then characterize the SOL and divertor with the FSP, McPherson, and Chromex if not successful then puff neon, argon, and nitrogen through B_SIDE until the divertor detaches, then characterize the SOL and divertor with the FSP, McPherson, and Chromex. puff neon, argon, and nitrogen through the floor tiles to try and detach the divertor. Characterize the SOL and divertor plasmas with the FSP, McPherson, and Chromex. if a completely detached H-mode (CDH) is achieved, attempt to optimize
Feb 27 1996 08:05:39:710AM		John Goetz	Setup for 960227 Engineering: ECDC in deuterium overnight Fiducial from 960209011 Power supplies and timing setup from 960209034 A_SIDE with 20 PSIA of deuterium B_TOP with 5 PSIA of deuterium B_SIDE_LOWER with 5 PSIA of argon LOWER_DIVERTOR with 5 PSIA of neon (~300 Torr on PLC screen) Enable VUV, MolyMon, PCX, TCX, ECE if status o.k. Hybrid enable A_SIDE and B_TOP for shot 001 *****The Helium-4 bottle will be replaced with Nitrogen for this run only***** Physics: Continuation of Mini Proposal #113 - Dissipative Divertor Studies This will be an attempt to achieve high-recycling and detached divertor conditions with boronized walls. Deuterium, neon, argon, and nitrogen will be puffed in the divertor and/or from B_SIDE in order to make the divertor dissipative. Exploration of the completely detached H-mode (CDH) regime will also be done. Beginning discharge conditions will be Ip=1.0MA, Bt=5.3T, nl04=1.5e20, Prf=2.4MW, with a discharge length of 1.1sec. BU
Feb 27 1996 09:12:35:000PM		John Goetz	Run 960227: Very good day for startup. All plasmas!!! Total neutrons = 7.87e14 Shot 960227043: Record stored energy = 213kJ Record fusion power of 153W and maximum neutron rate of 1.31e14
Feb 27 1996 08:06:13:480AM	960227001	John Goetz	Shot 960227001: PLC test of the TF
Feb 27 1996 08:24:08:400AM	960227002	John Goetz	Shot 960227002: Load 960209011 for fiducial BR_0 = .0055 prefill puff = 14msec Results: PF breaker pulled before the shot EF4 IOC shoot-thru
Feb 27 1996 09:02:20:300AM	960227003	John Goetz	Shot 960227003: try 002 again Results: plasma - all the way down acceptable fiducial loaded into database
Feb 27 1996 09:18:05:500AM	960227004	John Goetz	Shot 960227004: load 960209034 BR_0 = .0055 and prefill puff = 14msec Results: plasma - all the way down nice baseline shot for today's studies
Feb 27 1996 09:37:09:370AM	960227005	John Goetz	Shot 960227005: turn off gains on ZCUR @ 1.08sec on wires 2 and 3 270 Torr of neon thru B30-012 and K30-012 @ 0.7sec for 0.15sec Results: plasma - disrupts @ 1.11 upward moving disruption neon gets into the plasma after 0.92sec
Feb 27 1996 09:57:09:130AM	960227006	John Goetz	Shot 960227006: puff neon @ 0.6sec Results: plasma - disruption @ 1.10 neon in @ 0.85sec
Feb 27 1996 10:14:45:000AM	960227007	John Goetz	Shot 960227007: puff neon @ 0.55sec for 0.1sec from 4 floor valves Results: plasma - disrupts @ 1.10 neon in @ 0.82sec possible detachment @ 0.92+ out of H-mode @ 0.99 and back in @ 1.03
Feb 27 1996 10:27:51:290AM	960227008	John Goetz	Shot 960227008: puff neon from B30-012, H30-012, and D30-012 @ 0.55 for 0.1sec ZCUR drawn down 2cm @ 1.07sec gains on wires 2 and 3 off @ 1.095sec Results: plasma - disruption @ 1.10 in and out of H-mode on this one
Feb 27 1996 10:55:50:120AM	960227009	John Goetz	Shot 960227009: puff 235 Torr argon from B30-012 @ 0.55 for 0.1sec enable LPI for a silver pellet Results: plasma - disrupts @ 1.10 current rising very quickly; molybdenum rub at segment switch pellet timing incorrect
Feb 27 1996 11:12:19:900AM	960227010	John Goetz	Shot 960227010: add some PG3 in segment 1 130Torr of argon in plenum Results: plasma - disrupts @ 1.09 silver pellet killed this one current still rising quickly but the Mo influx reduced by 20% at segment switch argon shows up around 0.9sec
Feb 27 1996 11:25:22:780AM	960227011	John Goetz	Shot 960227011: more PG3 in segment 1 puff argon thru B30-012, D30-012, and K30-012 2 0.45sec Results: plasma - disrupts @ 1.11 very slow disruption - no pellet over-voltage fault on EF3 current rise bump at segment switch is gone
Feb 27 1996 11:45:58:600AM	960227012	John Goetz	Shot 960227012: no puffing in the divertor Results: plasma - disrupts @ 0.25 segment switch glitch is back with a vengeance OH1 never comes out of crossover
Feb 27 1996 11:58:10:790AM	960227013	John Goetz	Shot 960227013: no puffing in the divertor add more PG3 in segment 1 Results: plasma - disrupts @ 1.11 better H-mode behavior without the impurities
Feb 27 1996 12:19:16:640PM	960227014	John Goetz	Shot 960227014: puff 360 Torr of nitrogen thru B30-012 for 0.1sec @ 0.50sec Results: plasma - disrupts @ 1.10 current rise glitch has returned maybe some signs of nitrogen @ 0.80sec
Feb 27 1996 12:46:48:070PM	960227015	John Goetz	Shot 960227015: puff nitrogen thru B30-012 and H30-012 for 0.1sec @ 0.50sec add more PG3 in segment 1 Results: dud - ACK failure
Feb 27 1996 12:47:46:290PM	960227016	John Goetz	Shot 960227016: puff nitrogen thru B30-012 and H30-012 for 0.1sec @ 0.50sec add more PG3 in segment 1 Results: plasma - disrupts @ 1.09 still segment switch rub - a bit smaller though
Feb 27 1996 01:17:12:340PM	960227017	John Goetz	Shot 960227017: puff 570 Torr of nitrogen thru B30-012 and H30-012 for 0.1sec @ 0.50sec add more PG3 in segment 1 Results: plasma - disrupts @ 1.42 H -> L transition at the RF notch nice target for FSP
Feb 27 1996 01:44:40:220PM	960227018	John Goetz	Shot 960227018: more PG3 in segment 1 move nitrogen puff to 0.62sec and use all 4 floor valves Results: plasma - disrupts @ 1.30 divertor detaches @ 0.82 sec; Psol=1.2MW; Wp=.17MJ; Prf=2.8MW
Feb 27 1996 01:45:20:870PM	960227018	John Goetz	Shot 960227018: more PG3 in segment 1 move nitrogen puff to 0.62sec and use all 4 floor valves Results: plasma - disrupts @ 1.30 divertor detaches @ 0.82 sec; Psol=1.2MW; Wp=.17MJ; Prf=2.8MW
Feb 27 1996 01:59:56:950PM	960227019	John Goetz	Shot 960227019: remove notch in RF power Results: plasma - disrupts @ 1.18 slow divertor detachment @ 0.85?? stored energy remains high; Psol=1.5MW; Prf=3.2MW
Feb 27 1996 02:15:10:720PM	960227020	John Goetz	Shot 960227020: notch in RF power at 0.75sec puff thru B30-012, D30-012, and H30-012 Results: plasma - disrupts @ 1.05 is this a build-up of nitrogen?!? slow detachment happening throughout the second H-mode period
Feb 27 1996 02:35:49:760PM	960227021	John Goetz	Shot 960227021: no impurity puffing Results: plasma - all the way down large Mo injection @ 0.95
Feb 27 1996 02:48:13:420PM	960227022	John Goetz	Shot 960227022: no impurity puffing EF3 PLC limit increased to 15kA Results: Plasma - all the way down nice baseline plasma Wp=.2MJ; Prf=3MW; Psol=2.2MW
Feb 27 1996 03:12:35:220PM	960227023	John Goetz	Shot 960227023: puff nitrogen thru B30-012, D30-012, and H30-012 @ 0.62sec for 0.1sec Results: plasma - disrupts @ 1.30 divertor detaches around 0.8sec
Feb 27 1996 03:24:22:210PM	960227024	John Goetz	Shot 960227024: no changes Results: plasma - disrupts @ 1.32 possible divertor detachment @ 0.8
Feb 27 1996 03:38:59:430PM	960227025	John Goetz	Shot 960227025: no changes Results: plasma - disrupts @ 1.31 divertor detachment observed
Feb 27 1996 03:55:24:250PM	960227026	John Goetz	Shot 960227026: remove notch in RF power Results: plasma - disrupts @ 1.31 divertor detachment @ 0.82 good discharge
Feb 27 1996 04:05:55:660PM	960227027	John Goetz	Shot 960227027: no changes Results: plasma - disrupts @ 1.23 detached divertor @ 0.82 some H -> L transitions after .93 sec
Feb 27 1996 04:21:10:370PM	960227028	John Goetz	Shot 960227028: no changes Results: plasma - dirupts @ 1.23 divertor detaches @ 0.83
Feb 27 1996 04:36:30:360PM	960227029	John Goetz	Shot 960227029: no changes Results: plasma - disrupts @ 1.28 divertor begins to detach @ 0.83; finished by 0.90 Wp = 0.20MJ -> 0.18MJ when the detachment is complete
Feb 27 1996 04:51:23:000PM	960227030	John Goetz	Shot 960227030: no changes Results: plasma - disrupts @ 1.30 detached divertor @ 0.82 (complete @ 0.91)
Feb 27 1996 05:05:21:110PM	960227031	John Goetz	Shot 960227031: notch RF power @ 0.9sec target is acceptable for FSP Results: plasma - disruption @ 0.4368 molybdenum injection @ 0.43 everything looks o.k. before the disruption
Feb 27 1996 05:05:54:290PM	960227031	John Goetz	Shot 960227031: notch RF power @ 0.9sec target is acceptable for FSP Results: plasma - disruption @ 0.4368 molybdenum injection @ 0.43 everything looks o.k. before the disruption
Feb 27 1996 05:25:21:670PM	960227032	John Goetz	Shot 960227032: no changes - try again Results: plasma - disrupts @ .436 injection @ 0.43 everything look o.k.
Feb 27 1996 05:37:24:940PM	960227033	John Goetz	Shot 960227033: pull out RF scanning probe Results: plasma - disrupts @ 1.11 only 1.5MW of RF power (no D-port transmitter) nl04 = 1.1e20 (instead of 1.2e20)
Feb 27 1996 05:53:29:000PM	960227034	John Goetz	Shot 960227034: no changes Results: plasma - disrupts @ 1.32 no injections this shot, not even little ones divertor detaches @ 0.81 sec
Feb 27 1996 06:07:54:340PM	960227035	John Goetz	Shot 960227035: puff 570 Torr of nitrogen from B16-001 @ 0.62sec for 0.1sec Results: plasma - all the way down no detachment of the divertor
Feb 27 1996 06:24:27:790PM	960227036	John Goetz	Shot 960227036: no impurity puffing Results: plasma - all the way down good baseline shot
Feb 27 1996 06:37:38:940PM	960227037	John Goetz	Shot 960227037: puff 570 Torr of nitrogen from B16-001, B31-038, and B33-001 @ 0.62 for 0.1sec Results: plasma - disrupts @ 0.195 injections beginning @ 0.181
Feb 27 1996 06:59:15:540PM	960227038	John Goetz	Shot 960227038: pull out RF probe Results: plasma - disrupts @ 1.39 detached divertor @ 0.81
Feb 27 1996 07:16:08:880PM	960227039	John Goetz	Shot 960227039: puff 560Torr of N2 from B30-012 and H30-012 @ 0.62 for 0.1sec Results: plasma - disrupts @ 1.35 detached divertor @ 0.89
Feb 27 1996 07:36:33:840PM	960227040	John Goetz	Shot 960227040: remove RF power notch ZXL up 1mm @ 0.8 and 2mm @ 1.1 Results: plasma - disrupts @ 1.33 detached divertor @ 0.87 no probe data - nodes accidently turned off
Feb 27 1996 07:48:51:740PM	960227041	John Goetz	Shot 960227041: no changes Results: plasma - disrupts @ 1.34 detached divertor @ 0.89
Feb 27 1996 08:06:45:740PM	960227042	John Goetz	Shot 960227042: turn off RF power at 0.95sec Results: plasma - disrupts @ 1.35 detached divertor @ 0.88
Feb 27 1996 08:26:49:560PM	960227043	John Goetz	Shot 960227043: NL_04 = 1.5e20 a little more PG3 in segment 2 Results: plasma - disrupts @ 1.32 nl04 = 1.35e20 before H-mode detached divertor @ 0.93
Feb 27 1996 08:40:46:500PM	960227044	John Goetz	Shot 960227044: NL_04 = 1.5e20 @ 0.375 a little more PG3 in segment 2 620 Torr of nitrogen in LOWER_DIVERTOR Results: plasma - disrupts @ 1.29 nl04 = 1.4e20 before H-mode Prf = 3.5MW -> 1.8MW (D-Port trip) detached divertor @ 0.81 because of this
Feb 27 1996 08:54:43:550PM	960227045	John Goetz	Shot 960227045: NL_04 = 1.5e20 @ 0.325 Results: plasma - disrupts @ 1.28 Prf = 3.2 MW; Wp = 0.19MJ detached divertor @ 0.89
Feb 27 1996 09:09:42:490PM	960227046	John Goetz	Shot 960227046: puff 570 Torr of nitrogen thru B30-012, D30-012, H30-012 @ 0.62sec for 0.1sec Results: plasma - disrupts @ 1.15 definitely more nitrogen in this plasma detached divertor @ 0.845sec

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:01:32:640AM	Test	Ok
2	08:19:04:640AM	Plasma	Bad	ef4 fault
3	08:43:39:480AM	Plasma	Ok
4	09:01:15:340AM	Plasma	Ok
5	09:21:53:100AM	Plasma	Ok
6	09:37:27:780AM	Plasma	Ok
7	09:57:27:740AM	Plasma	Ok
8	10:16:12:980AM	Plasma	Ok
9	10:36:21:880AM	Plasma	Ok
10	10:54:43:680AM	Plasma	Ok
11	11:10:52:410AM	Plasma	Ok
12	11:33:25:170AM	Plasma	Ok
13	11:49:16:030AM	Plasma	Ok
14	12:06:20:800PM	Plasma	Ok
15	12:20:21:950PM	Plasma	Ok
16	12:28:20:660PM	Plasma	Ok
17	01:05:18:080PM	Plasma	Ok
18	01:25:37:980PM	Plasma	Ok
19	01:46:25:020PM	Plasma	Ok
20	02:00:36:740PM	Plasma	Ok
21	02:17:27:330PM	Plasma	Ok
22	02:38:05:450PM	Plasma	Ok
23	02:55:10:100PM	Plasma	Ok
24	03:13:27:080PM	Plasma	Ok
25	03:28:10:300PM	Plasma	Ok
26	03:39:40:430PM	Plasma	Ok
27	03:55:15:290PM	Plasma	Ok
28	04:10:33:660PM	Plasma	Ok
29	04:24:21:040PM	Plasma	Ok
30	04:38:19:880PM	Plasma	Ok
31	04:50:34:750PM	Plasma	Ok
32	05:06:59:860PM	Plasma	Ok
33	05:25:52:890PM	Plasma	Ok
34	05:42:09:980PM	Plasma	Ok
35	05:57:52:780PM	Plasma	Ok
36	06:12:42:490PM	Plasma	Ok
37	06:27:46:560PM	Plasma	Ok
38	06:40:39:300PM	Plasma	Ok
39	06:59:02:390PM	Plasma	Ok
40	07:21:01:340PM	Plasma	Ok
41	07:37:14:700PM	Plasma	Ok
42	07:55:07:740PM	Plasma	Ok
43	08:10:36:560PM	Plasma	Ok
44	08:27:12:870PM	Plasma	Ok
45	08:43:33:520PM	Plasma	Ok
46	08:59:13:220PM	Plasma	Ok