Miniproposals

Miniproposal: 315 Date Filed: 8/5/2002 Title: Developing shape for C-Mod/Jet identity experiment First Author: Dmitri Mossessian Session Leader: Dmitri Mossessian (shots 1-35)

Engineering Operator Run Comment

Purpose: MP326 High Power RF/Mosseeeian/Rowan/Cochran/Parkin

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:32:943PM

Author: Dmitri Mossessian

Run summary for 1030606 - JET dimensionless identity expt. (MP 315) Run Plan The run is a continuation of the run 1021104. The goal is to finish density/power scan that we did not complete on that day plus to study possible dependence of the H-mode character (EDAness) on plasma shape by doing a smooth transition from JET shape to "standard" C-Mod shape. On 1021104 good match was obtained for shape and plasma parameters (Ip and Bt). RF had troubles heating high density plasmas (with nl above 1e20) in JET configuration, so very limited density and temperature scan was done. Besides, the walls were not connditioned on that day and it was not clear wether we could not achieve a good EDA because of the wall conditions or because we ran JET shape. Summary: We started with shot 1021104031 that has a good shape and current/field match. Reprogram target density to 0.8e20. With 2 MW of RF we got good H-mode with EDA interrupted by bursts of ELMs. It is not clear whether this behavior is due to a peculiar shape or a position of strike point which is on the very top of the divertor nose. Increasing target density to 1e20 turns out to be a problem for RF. When we finally got steady 2MW of RF power on shot 9 no H-mode was produced. Aparently, L-H threshold is higher in this configuration than in our regular shape. Attempting higher RF power lead to short H-mode on shot 10. Finaly, on shot 15 a "long" H-mode was obtained with RF around 2.5 MW. An attempt to heat the plasma into H-mode at target density of 1.2e20 failed miserably. After 4 unsuccesful shots we turned back to 0.8e20 and did the power scan. The H-mode scenario at nl=0.8e20 looks like the following: High RF power heats the plasma into H-mode. Pedestal and core temperature rise and the QC mode appears at the edge. At the same time radiated power rises very fast, leading to collapse of both core and pedestal temperature. The QC mode terminates and we get a burst of type III ELMs. During the ELMy period impurity confinement deteriorates, radiated power drops and RF heats the edge again into QC mode regime. Then the cycle repeats. We attempted a power scan to cover a range of pedestal temperatures. Pedestal temperature does not change much apart from the first few points in EDA while radiation is still low. At high power the radiation rises faster and H-mode terminates before it has a chance to go to type III ELMs. There is only one instance of the EDA/typeIII cycle in the second H-mode on shot 22. Having done the RF scan we moved to the next part of the proposal and tried to establish whether the observed behavior is due to JET shape (or location of strike points) and changed lower triangularity to 0.5 by moving RXL in 1.5 cm (shot 23). Neither that, not changing minor radius back to .22 (shot 24) produced any positive changes in H-mode character. Loading "standard" C-Mod configuration from shot 1030605030 on shot 26 did not help. The H-modes are still not clear EDAs but short ELM-free with sometimes present QC mode interrupted by bursts of ELMs. The only possible explanation is that this behavior is caused by excessive impurities that we stured up by moving the strike point up the divertor nose earlier. It means that the behavior observed on JET is not typical to the JET shape but rather caused by impurities. That is actually a positive result since it probably means that something like an EDA could be obtained on JET if walls were cleaner. Having done everything we could for JET similarity experiment by 15:00 we decided to switch to the MP on triggering ELMs by current rise that is scheduled for next week. This attempt was generally not succesful. We tried current ramps with various ramp rate during H-mode but were not able to produce ELMs. It seems that current rise actually kills H-mode as soon as it starts. Further analysis of the shots is necessary to develop the further startegy for the experiment. Details: ---------------------------------------------------------------------------- 1030606001 mossessian SESSION_LEADER Jun 6 2003 9:22:15:543AM . . . . . . . . . . . . . . . . . . . . First shot reproduces 1021104031 that had good shape match. We got about 1 MW of RF tripping, 3 H-modes. Shape is OK, but x-point on C-Mod is a little lower than on JET. For next shot - move ZXL up 5 mm. It will move the strike point out of the divertor. ---------------------------------------------------------------------------- 1030606002 mossessian SESSION_LEADER Jun 6 2003 9:40:20:810AM . . . . . . . . . . . . . . . . . . . . Strike point moved up, shape is a little better. RF = 2MW, H-mode is similar to JET with bursts of ELMs between QC modes. Next shot - move ZXL 5 mm higher. nl to 1e20, RF 2 MW ---------------------------------------------------------------------------- 1030606003 mossessian SESSION_LEADER Jun 6 2003 9:53:53:480AM . . . . . . . . . . . . . . . . . . . . Strike point moved up, shape is good. But llongation and q are lower than JET. q changed from 4.8 to 4.3 RF strarts at 2MW then trips and goes to 1 MW. No H-mode Next shot - repeat with better RF ---------------------------------------------------------------------------- 1030606006 mossessian SESSION_LEADER Jun 6 2003 10:35:39:730AM . . . . . . . . . . . . . . . . . . . . Similar to 3. No H-mode. Next shot - reload segment 2 from shot 2 with nl=0.8e20. ---------------------------------------------------------------------------- 1030606007 mossessian SESSION_LEADER Jun 6 2003 10:54:36:893AM . . . . . . . . . . . . . . . . . . . . H-mode similar to shot 2. Interestingly, as soon as plasma goes into H-mode, central Te drops toL-mode level, while pedestal Te stays high. Next shot - go to target nl=1e20 ---------------------------------------------------------------------------- 1030606008 mossessian SESSION_LEADER Jun 6 2003 11:00:52:540AM . . . . . . . . . . . . . . . . . . . . No H-mode again. RF trips a lot, but heats the center OK. Next shot - try to improve RF, no changes in plasma ---------------------------------------------------------------------------- 1030606010 mossessian SESSION_LEADER Jun 6 2003 11:27:17:790AM . . . . . . . . . . . . . . . . . . . . Short and ugly H-mode, but with a trace of QC mode in reflectometer signal. RF trips as soon as H-mode starts. No changes for next shot - try for better RF ---------------------------------------------------------------------------- 1030606012 mossessian SESSION_LEADER Jun 6 2003 11:50:53:926AM . . . . . . . . . . . . . . . . . . . . Rf is a little better now - short H-mode No changes for next shot - try for better RF ---------------------------------------------------------------------------- 1030606014 mossessian SESSION_LEADER Jun 6 2003 12:16:04:660PM . . . . . . . . . . . . . . . . . . . . Rf is better. Power about 2.5 MW H-modes interrupted by bRF trips. No changes for next shot - try for better RF ---------------------------------------------------------------------------- 1030606015 mossessian SESSION_LEADER Jun 6 2003 12:29:18:283PM . . . . . . . . . . . . . . . . . . . . Rf is better. H-mode shows behavior similar to lower density. Next shot - go to target nl=1.2e20 ---------------------------------------------------------------------------- 1030606019 mossessian SESSION_LEADER Jun 6 2003 1:28:53:670PM . . . . . . . . . . . . . . . . . . . . No luck with RF at 1.2 MW. We'll return to lower density and do a power scan Next shot - go back to 0.8e20 and do power scan. Next shot should be just like shot 7 but with 2.5 MW of RF ---------------------------------------------------------------------------- 1030606020 mossessian SESSION_LEADER Jun 6 2003 1:37:10:010PM . . . . . . . . . . . . . . . . . . . . Good shot. RF at 2.5 MW. H-mode with EDA and bursts of ELMs Next shot - higher RF ---------------------------------------------------------------------------- 1030606021 mossessian SESSION_LEADER Jun 6 2003 1:58:58:303PM . . . . . . . . . . . . . . . . . . . . Good shot. Max RF at 3.5 MW. Series of ELM-free H-modes with high impurity accumulation but QC mode present at the edge. Next shot - higher RF ---------------------------------------------------------------------------- 1030606022 mossessian SESSION_LEADER Jun 6 2003 2:05:51:280PM . . . . . . . . . . . . . . . . . . . . Similar to 21. RF has longer steady periods. Several H-modes with high radiated power. Inside the second H-mode period a similar to previous behavior with burst of ELMs affecting radiated power. Next shot - back to RF =2.5 MW, RXL down by 1.5 cm to get to lower delta of 0.5. ---------------------------------------------------------------------------- 1030606023 mossessian SESSION_LEADER Jun 6 2003 2:29:42:456PM . . . . . . . . . . . . . . . . . . . . Lower triangularity about 0.5. Several ugly H-modes. QC mode present only in the first. Next shot - go to "normal" minor radius ---------------------------------------------------------------------------- 1030606024 mossessian SESSION_LEADER Jun 6 2003 2:38:31:456PM . . . . . . . . . . . . . . . . . . . . back to a=.22, delta_lower=.5. H-mode starts with QC mode that gets killed by radiation and the rest is all type III Next shot - RF tro 4 MW ---------------------------------------------------------------------------- 1030606025 mossessian SESSION_LEADER Jun 6 2003 2:46:19:843PM . . . . . . . . . . . . . . . . . . . . Although shape is very similar to "normal" C-Mod shape we still have ELM-free with typeIII bursts as in JET shape. Next shot - load 1030605030, change nl to 0.8e20. Keep Rf at 4 MW ---------------------------------------------------------------------------- 1030606027 mossessian SESSION_LEADER Jun 6 2003 3:35:58:243PM . . . . . . . . . . . . . . . . . . . . Similar to 25 Next shot - we've done everything we could for JET similarity. We'll try the current ramp-up experiment next ---------------------------------------------------------------------------- 1030606029 mossessian SESSION_LEADER Jun 6 2003 3:47:22:870PM . . . . . . . . . . . . . . . . . . . . Current rise is somwhat slow, but it looks like it can not do it faster. RF trips a lot. Next shot - reduce RF to 3 MW and improve tuning. ---------------------------------------------------------------------------- 1030606031 mossessian SESSION_LEADER Jun 6 2003 4:10:02:936PM . . . . . . . . . . . . . . . . . . . . Nice smooth current rise and good RF at 2.8 MW. But H-mode starts only after the current rise Next shot - move current ramp 0.1 s later - H-mode should start before current ramp ---------------------------------------------------------------------------- 1030606032 mossessian SESSION_LEADER Jun 6 2003 5:08:25:480PM . . . . . . . . . . . . . . . . . . . . H-mode starts before current rise, but terminates as soon as current starts to increase. Next shot -longer ramp ---------------------------------------------------------------------------- 1030606033 mossessian SESSION_LEADER Jun 6 2003 5:09:48:043PM . . . . . . . . . . . . . . . . . . . . Again current ramp kills the H-mode. There are a few L-H transitions later during the ramp Next shot -try short and fast ramp ---------------------------------------------------------------------------- 1030606034 mossessian SESSION_LEADER Jun 6 2003 5:10:44:950PM . . . . . . . . . . . . . . . . . . . . Next shot - current ramp twice as slow as on shot 33 ---------------------------------------------------------------------------- 1030606035 mossessian SESSION_LEADER Jun 6 2003 5:11:03:123PM . . . . . . . . . . . . . . . . . . . . Same result - H-mode terminates as soon as Ip ramp starts

Physics Operator Summaries

Entered: Jul 7 2004 04:37:18:160PM

Author: Bill Rowan

Physop Summary for Friday, June 6, 2003. 1030606 MP#315 C-Mod/JET similarity MP#292 Triggering ELM's by fast Ip ramp SL: Mossessian PO: Rowan EO: Cochran, Fitzgerald, Byford, Parkin Engineering setup -------------------------------------------------------- ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00. Bake at 60 C overnight. Run begins at 09:00 and ends at 17:00. All ICRF transmitters will be needed for this run. Power systems the same as on 1021104031 Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) Enable the following gatevalves: ECE, DNB, VUV Run Plan------------------------------------------------------------------ The run is a continuation of the run 1021104. The goal is to finish density/power scan that we did not complete on that day plus to study possible dependence of the H-mode character (EDAness) on plasma shape by doing a smooth transition from JET shape to "standard" C-Mod shape. On 1021104 good match was obtained for shape and plasma parameters (Ip and Bt). RF had troubles heating high density plasmas (with nl above 1e20) in JET configuration, so very limited density and temperature scan was done. Besides, the walls were not connditioned on that day and it was not clear wether we could not achieve a good EDA because of the wall conditions or because we ran JET shape. We will start with shot 1021104031 that has a good shape and current/field match. Reprogram target density to 0.8e20. Step RF power up from 1 MW to 3 MW in 0.5 MW steps - 5 shots Increase target density from 0.8e20 to 2e20 in 0.4 e20 steps, repeating power scan for every density - 15 shots minimum Find best match to JET H-mode and increase lower triangularity watching for changes in H-mode character. Results-------------------------------------------------------------------- The run started with MP315. To start the run, segment 2 was loaded from 1021104031 and segment 1 was loaded from 1030605030 -- one of the many good shots from the previous day. Only the density was changed for this first shot, nl_04 = 0.8e+20. The shape was modified slightly for shot 002 to better match the JET shape required. Other than some simple changes in density and shape tweaks, the discharge remained the same through shot 025. The next major operation changed occurred at shot 028. Segment 2 was loaded from 1030530021 and a current pulse was added to attempt to make some progress on MP292 before its scheduled run day next week. The last shots of the day involved changes in the current pulse. Varying the rise time and the fall time. See session leader report for details. C-Mod ran quite well throughout the day. The startup went untouched although there was an x-ray burst early that should have been addressed for the benefit of the commissioning of the new x-ray diagnostic. There were no fizzles or duds. The three disruptions toward the end of the day were due to the current pulse. Score card Plasma attempts 35 Full length Plasmas 32 Disruptions 3 Duds 0 Fizzles 0 Detailed log----------------------------------------------------------- open pcs and load 1021104031 acknowledged warning regarding ACOILs zeroed the ACOIL_CUR in the ALL-V screen Choose a startup. No changes in the last hour of 1030605 so choose any shot. Load segment 1 from 1030605030 001. Plasma. For this shot, the density was reduced to an nl_04=0.8e+20. The target shot was 1.1e+20. Otherwise, the shot was intended to be the same. EO: Cochran and Fitzgerald Next shot. SL asked to move zxl up by approximately 5 mm to better match the JET shape. This should make the strike point quite high. 002. Plasma Next shot. Raise the density to nl_04=1.0e+20 Raise zxl by 5 mm 003. Plasma. Nl_04 as requested. Next shot. Repeat for RF 004. Plasma Next shot. Lower zxu by 5 mm. Returning to the approximate setting of shot 002 Attempting to recover h-mode 005. Plasma. No h-modes. Next shot: repeat 006. Plasma. No h modes Next shot: reload shot 002. 007. Plasma. H-mode. Successfully reproduced shot 002. Comforting. Next shot: raise the density nl_04e=1.0e+20 008. Plasma. No H-modes Next shot. No pcs changes 009. Plasma. No H-mode Next shot. No pcs changes 010. Plasma. May be a short h-mode at 0.7 s Next shot. No pcs changes 011. Plasma. Next shot. No pcs changes 012. Plasma. H-mode at 0.67 s. Duration approximately 0.2s Next shot. No pcs changes. 013. Plasma. H-mode. Next shot. No pcs changes. 014. Plasma H-mode. Duration approximately 0.6 s Next shot. No pcs changes. 015. Plasma. Similar to last shot. Next shot. Increase density. Nl_04 = 1.2e+20 016. Plasma. Density okay. No H-modes Next shot. No pcs changes 017. Plasma. EO: Byford. Next shot. No pcs changes 018. Plasma. Next shot. No pcs changes 019. Plasma. Next shot: density reduced. Nl_04 = 0.8e+20 020. Plasma H-mode Next shot. No pcs changes. 021. Plasma. Next shot. No pcs changes. 022. Plasma Next shot. RXL changed from 0.03 to 0.015 from 0. 4s 023. Plasmas Next shot. Clearin reduced by 1.5 cm. Rcur reduced by 8 mm 024. Plasmas Next shot. Reduced Ar (pulsed gas 1) from 40 ms to 30 ms 025. Plasma Next shot. Reload segment 2 from shot 1030605030 026. Plasma Next shot. No pcs changes. 027. Plasma Next shot. Reloaded 1030530021 Added current ramp at 0.6 s to 1.2 MA Ramp back down to 0.6 MA after 100 ms Density increased late in the shot. NL_04=6e+19 EO: Parkin 028. Plasma. Disruption at the ramp up Next shot. Reduced the rate of rise and the plateau value for the current 029. Plasma. Next shot. No pcs changes 030. Plasma Next shot. Changed the targed IP to 500 kA Increased the ramp up time from 150 ms to 200 ms ending at 800 kA 031. Plasma Next shot. Move the current feature 100 ms later 032. Plasma Next shot. Increase the current plateau to 1 MA while keeping the ramp rate unchanged. 033. Plasma. Disruption. Next shot. Reduced the current plateau 034. Plasma. Next shot. Returned to Shot 033 and slowed the rate of current rise at the beginning of the pulse 035. Plasma Disrupted during the rampdown Last shot

Session Leader Comments
Jun 6 2003 09:22:15:543AM	1030606001	Dmitri Mossessian	First shot reproduces 1021104031 that had good shape match. We got about 1 MW of RF tripping, 3 H-modes. Shape is OK, but x-point on C-Mod is a little lower than on JET. For next shot - move ZXL up 5 mm. It will move the strike point out of the divertor.
Jun 6 2003 09:40:20:810AM	1030606002	Dmitri Mossessian	Strike point moved up, shape is a little better. RF = 2MW, H-mode is similar to JET with bursts of ELMs between QC modes. Next shot - move ZXL 5 mm higher. nl to 1e20, RF 2 MW
Jun 6 2003 09:53:53:480AM	1030606003	Dmitri Mossessian	Strike point moved up, shape is good. But llongation and q are lower than JET. q changed from 4.8 to 4.3 RF strarts at 2MW then trips and goes to 1 MW. No H-mode Next shot - repeat with better RF
Jun 6 2003 10:35:39:730AM	1030606006	Dmitri Mossessian	Similar to 3. No H-mode. Next shot - reload segment 2 from shot 2 with nl=0.8e20.
Jun 6 2003 10:54:36:893AM	1030606007	Dmitri Mossessian	H-mode similar to shot 2. Interestingly, as soon as plasma goes into H-mode, central Te drops toL-mode level, while pedestal Te stays high. Next shot - go to target nl=1e20
Jun 6 2003 11:00:52:540AM	1030606008	Dmitri Mossessian	No H-mode again. RF trips a lot, but heats the center OK. Next shot - try to improve RF, no changes in plasma
Jun 6 2003 11:27:17:790AM	1030606010	Dmitri Mossessian	Short and ugly H-mode, but with a trace of QC mode in reflectometer signal. RF trips as soon as H-mode starts. No changes for next shot - try for better RF
Jun 6 2003 11:50:53:927AM	1030606012	Dmitri Mossessian	Rf is a little better now - short H-mode No changes for next shot - try for better RF
Jun 6 2003 12:16:04:660PM	1030606014	Dmitri Mossessian	Rf is better. Power about 2.5 MW H-modes interrupted by bRF trips. No changes for next shot - try for better RF
Jun 6 2003 12:29:18:283PM	1030606015	Dmitri Mossessian	Rf is better. H-mode shows behavior similar to lower density. Next shot - go to target nl=1.2e20
Jun 6 2003 01:28:53:670PM	1030606019	Dmitri Mossessian	No luck with RF at 1.2 MW. We'll return to lower density and do a power scan Next shot - go back to 0.8e20 and do power scan. Next shot should be just like shot 7 but with 2.5 MW of RF
Jun 6 2003 01:37:10:010PM	1030606020	Dmitri Mossessian	Good shot. RF at 2.5 MW. H-mode with EDA and bursts of ELMs Next shot - higher RF
Jun 6 2003 01:58:58:303PM	1030606021	Dmitri Mossessian	Good shot. Max RF at 3.5 MW. Series of ELM-free H-modes with high impurity accumulation but QC mode present at the edge. Next shot - higher RF
Jun 6 2003 02:05:51:280PM	1030606022	Dmitri Mossessian	Similar to 21. RF has longer steady periods. Several H-modes with high radiated power. Inside the second H-mode period a similar to previous behavior with burst of ELMs affecting radiated power. Next shot - back to RF =2.5 MW, RXL down by 1.5 cm to get to lower delta of 0.5.
Jun 6 2003 02:29:42:457PM	1030606023	Dmitri Mossessian	Lower triangularity about 0.5. Several ugly H-modes. QC mode present only in the first. Next shot - go to "normal" minor radius
Jun 6 2003 02:38:31:457PM	1030606024	Dmitri Mossessian	back to a=.22, delta_lower=.5. H-mode starts with QC mode that gets killed by radiation and the rest is all type III Next shot - RF tro 4 MW
Jun 6 2003 02:46:19:843PM	1030606025	Dmitri Mossessian	Although shape is very similar to "normal" C-Mod shape we still have ELM-free with typeIII bursts as in JET shape. Next shot - load 1030605030, change nl to 0.8e20. Keep Rf at 4 MW
Jun 6 2003 03:35:58:243PM	1030606027	Dmitri Mossessian	Similar to 25 Next shot - we've done everything we could for JET similarity. We'll try the current ramp-up experiment next
Jun 6 2003 03:47:22:870PM	1030606029	Dmitri Mossessian	Current rise is somwhat slow, but it looks like it can not do it faster. RF trips a lot. Next shot - reduce RF to 3 MW and improve tuning.
Jun 6 2003 04:10:02:937PM	1030606031	Dmitri Mossessian	Nice smooth current rise and good RF at 2.8 MW. But H-mode starts only after the current rise Next shot - move current ramp 0.1 s later - H-mode should start before current ramp
Jun 6 2003 05:08:25:480PM	1030606032	Dmitri Mossessian	H-mode starts before current rise, but terminates as soon as current starts to increase. Next shot -longer ramp
Jun 6 2003 05:09:48:043PM	1030606033	Dmitri Mossessian	Again current ramp kills the H-mode. There are a few L-H transitions later during the ramp Next shot -try short and fast ramp
Jun 6 2003 05:10:44:950PM	1030606034	Dmitri Mossessian	Next shot - current ramp twice as slow as on shot 33
Jun 6 2003 05:11:03:123PM	1030606035	Dmitri Mossessian	Same result - H-mode terminates as soon as Ip ramp starts

Physics Operator Comments
Jun 6 2003 08:20:23:497AM		Bill Rowan	Engineering setup and run plan for Friday 1030606 MP#315 C-Mod/JET similarity SL: Mossessian PO: Rowan ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00. Bake at 60 C overnight. Run begins at 09:00 and ends at 17:00. All ICRF transmitters will be needed for this run. Power systems the same as on 1021104031 Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) Enable the following gatevalves: ECE, DNB, VUV Run Plan The run is a continuation of the run 1021104. The goal is to finish density/power scan that we did not complete on that day plus to study possible dependence of the H-mode character (EDAness) on plasma shape by doing a smooth transition from JET shape to "standard" C-Mod shape. On 1021104 good match was obtained for shape and plasma parameters (Ip and Bt). RF had troubles heating high density plasmas (with nl above 1e20) in JET configuration, so very limited density and temperature scan was done. Besides, the walls were not connditioned on that day and it was not clear wether we could not achieve a good EDA because of the wall conditions or because we ran JET shape. We will start with shot 1021104031 that has a good shape and current/field match. Reprogram target density to 0.8e20. Step RF power up from 1 MW to 3 MW in 0.5 MW steps - 5 shots Increase target density from 0.8e20 to 2e20 in 0.4 e20 steps, repeating power scan for every density - 15 shots minimum Find best match to JET H-mode and increase lower triangularity watching for changes in H-mode character.
Jun 6 2003 08:52:18:230AM		Bill Rowan	open pcs and load 1021104031 acknowledged warning regarding ACOILs zeroed the ACOIL_CUR in the ALL-V screen Choose a startup. No changes in the last hour of 1030605 so choose any shot. Load segment 1 from 1030605030
Jun 6 2003 09:11:15:497AM	1030606001	Bill Rowan	001. Plasma. For this shot, the density was reduced to an nl_04=0.8e+20. The target shot was 1.1e+20. Otherwise, the shot was intended to be the same.
Jun 6 2003 09:11:53:310AM	1030606001	Bill Rowan	EO: Cochran and Fitzgerald
Jun 6 2003 09:21:24:857AM	1030606001	Bill Rowan	Next shot. SL asked to move zxl up by approximately 5 mm to better match the JET shape. This should make the strike point quite high.
Jun 6 2003 09:38:38:340AM	1030606002	Bill Rowan	002. Plasma Next shot. Raise the density to nl_04=1.0e+20 Raise zxl by 5 mm
Jun 6 2003 09:51:16:590AM	1030606003	Bill Rowan	003. Plasma. Nl_04 as requested. Next shot. Repeat for RF
Jun 6 2003 10:03:22:263AM	1030606004	Bill Rowan	004. Plasma Next shot. Lower zxu by 5 mm. Returning to the approximate setting of shot 002 Attempting to recover h-mode
Jun 6 2003 10:13:18:700AM	1030606005	Bill Rowan	005. Plasma. No h-modes.
Jun 6 2003 10:17:50:717AM	1030606005	Bill Rowan	005. Plasma. No h-modes. Next shot: repeat
Jun 6 2003 10:37:53:840AM	1030606006	Bill Rowan	006. Plasma. No h modes Next shot: reload shot 002.
Jun 6 2003 10:51:58:343AM	1030606007	Bill Rowan	007. Plasma. H-mode. Successfully reproduced shot 002. Comforting. Next shot: raise the density nl_04e=1.0e+20
Jun 6 2003 11:03:46:247AM	1030606008	Bill Rowan	008. Plasma. No H-modes Next shot. No pcs changes
Jun 6 2003 11:11:38:117AM	1030606009	Bill Rowan	009. Plasma. No H-mode Next shot. No pcs changes
Jun 6 2003 11:28:08:667AM	1030606010	Bill Rowan	010. Plasma. May be a short h-mode at 0.7 s Next shot. No pcs changes
Jun 6 2003 11:37:15:660AM	1030606011	Bill Rowan	011. Plasma. Next shot. No pcs changes
Jun 6 2003 11:51:33:397AM	1030606012	Bill Rowan	012. Plasma. H-mode at 0.67 s. Duration approximately 0.2s Next shot. No pcs changes.
Jun 6 2003 12:06:44:850PM	1030606013	Bill Rowan	013. Plasma. H-mode. Next shot. No pcs changes.
Jun 6 2003 12:15:25:923PM	1030606014	Bill Rowan	014. Plasma H-mode. Duration approximately 0.6 s Next shot. No pcs changes.
Jun 6 2003 12:29:10:330PM	1030606015	Bill Rowan	015. Plasma. Similar to last shot. Next shot. Increase density. Nl_04 = 1.2e+20
Jun 6 2003 12:44:03:847PM	1030606016	Bill Rowan	016. Plasma. Density okay. No H-modes Next shot. No pcs changes
Jun 6 2003 12:58:17:567PM	1030606017	Bill Rowan	017. Plasma. Next shot. No pcs changes
Jun 6 2003 01:06:14:433PM	1030606018	Bill Rowan	018. Plasma. Next shot. No pcs changes
Jun 6 2003 01:29:49:797PM	1030606019	Bill Rowan	019. Plasma. Next shot: density reduced. Nl_04 = 0.8e+20
Jun 6 2003 01:35:51:693PM	1030606020	Bill Rowan	020. Plasma H-mode Next shot. No pcs changes.
Jun 6 2003 01:52:54:017PM	1030606021	Bill Rowan	021. Plasma. Next shot. No pcs changes.
Jun 6 2003 02:06:39:220PM	1030606022	Bill Rowan	022. Plasma Next shot. RXL changed from 0.03 to 0.015 from 0. 4s
Jun 6 2003 02:24:11:313PM	1030606023	Bill Rowan	023. Plasmas Next shot. Clearin reduced by 1.5 cm. Rcur reduced by 8 mm
Jun 6 2003 02:36:45:263PM	1030606024	Bill Rowan	024. Plasmas Next shot. Reduced Ar (pulsed gas 1) from 40 ms to 30 ms
Jun 6 2003 02:47:45:410PM	1030606025	Bill Rowan	025. Plasma Next shot. Reload segment 2 from shot 1030605030
Jun 6 2003 02:57:34:100PM	1030606026	Bill Rowan	026. Plasma Next shot. No pcs changes.
Jun 6 2003 03:18:16:733PM	1030606027	Bill Rowan	027. Plasma Next shot. Reloaded 1030530021 Added current ramp at 0.6 s to 1.2 MA Ramp back down to 0.6 MA after 100 ms Density increased late in the shot. NL_04=6e+19 EO: Parkin
Jun 6 2003 03:34:35:960PM	1030606028	Bill Rowan	028. Plasma. Disruption at the ramp up Next shot. Reduced the rate of rise and the plateau value for the current
Jun 6 2003 04:00:02:327PM	1030606030	Bill Rowan	030. Plasma Next shot. Changed the targed IP to 500 kA Increased the ramp up time from 150 ms to 200 ms ending at 800 kA
Jun 6 2003 04:09:45:670PM	1030606031	Bill Rowan	031. Plasma Next shot. Move the current feature 100 ms later
Jun 6 2003 04:23:23:283PM	1030606032	Bill Rowan	032. Plasma Next shot. Increase the current plateau to 1 MA while keeping the ramp rate unchanged.
Jun 6 2003 04:43:00:750PM	1030606033	Bill Rowan	033. Plasma. Disruption. Next shot. Reduced the current plateau
Jun 6 2003 04:55:18:193PM	1030606034	Bill Rowan	034. Plasma. Next shot. Returned to Shot 033 and slowed the rate of current rise at the beginning of the pulse
Jun 6 2003 04:56:06:443PM	1030606034	Bill Rowan	034. Plasma. Next shot. Returned to Shot 033 and slowed the rate of current rise at the beginning of the pulse
Jun 6 2003 05:05:23:240PM	1030606035	Bill Rowan

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:07:42:700AM	Plasma	Ok
2	09:24:31:013AM	Plasma	Ok
3	09:40:28:340AM	Plasma	Ok
4	09:56:17:497AM	Plasma	Ok
5	10:09:52:450AM	Plasma	Ok
6	10:27:28:140AM	Plasma	Ok
7	10:41:07:687AM	Plasma	Ok
8	10:53:47:407AM	Plasma	Ok
9	11:06:41:690AM	Plasma	Ok
10	11:19:09:390AM	Plasma	Ok
11	11:31:52:407AM	Plasma	Ok
12	11:44:41:983AM	Plasma	Ok
13	11:57:10:887AM	Plasma	Ok
14	12:09:35:090PM	Plasma	Ok
15	12:22:00:167PM	Plasma	Ok
16	12:34:35:633PM	Plasma	Ok
17	12:47:07:820PM	Plasma	Ok
18	01:00:11:617PM	Plasma	Ok
19	01:16:13:280PM	Plasma	Ok
20	01:31:12:177PM	Plasma	Ok
21	01:43:43:407PM	Plasma	Ok
22	01:56:18:357PM	Plasma	Ok
23	02:09:03:480PM	Plasma	Ok
24	02:25:08:660PM	Plasma	Ok
25	02:37:36:170PM	Plasma	Ok
26	02:50:27:967PM	Plasma	Ok
27	03:07:04:100PM	Plasma	Ok
28	03:19:52:287PM	Plasma	Ok
29	03:35:25:553PM	Plasma	Ok
30	03:48:23:887PM	Plasma	Ok
31	04:01:04:610PM	Plasma	Ok
32	04:13:34:177PM	Plasma	Ok
33	04:26:25:507PM	Plasma	Ok
34	04:44:31:550PM	Plasma	Ok
35	04:57:12:087PM	Plasma	Ok