Miniproposals

Miniproposal: 188 Date Filed: 10/1/1997 Title: H-mode Pedestal Measurements First Author: Amanda Hubbard Session Leader: Amanda Hubbard (shots 1-31)

Engineering Operator Run Comment

mp 188 hubbard,granetz,cochran,bertolino

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:17:460PM

Author: To Be Determined

Run Summary for 971211, MP 188 "H-mode Pedestal Measurements" Session Leader: Amanda Hubbard Physics Operators: Bob Granetz and John Goetz The goal of this MP was to obtain a consistent set of edge pedestal data using all of the newly available diagnostic techniques, in good quality RF H-modes, in time for APS. This was largely accomplished (except for the 'in time for APS' part). The machine generally ran well and reliably, as did the RF. H-modes were obtained on all discharges. Shots 1-7 were spent setting up the target conditions (1.0 MA, 5.4 T, nel ~10^20m-3) and bringing up (and measuring!) the RF power. H-modes were mainly ELM-free and of relatively short duration, with some Type III ELMy periods. Density and Prad continued to rise rapidly, despite the overnight boronization. Some shots (eg 4,6) had relatively long delays before H-mode began, despite 2.2 MW of RF. There were indications of high gas/neutral loads, which may or may not be relevant. These should be examined further for threshold purposes. On shots 9-12, Bt ramps were programmed near the start of the H-mode in order to sweep ECE channels across the pedestal. Shots 9& 10 used positive steps, 5.4-5.65 T, which proved about right and was found to take ~110 ms. A concern is that these H-modes are far from steady state, given the rises in ne and Prad. On shots 11 and 12, Bt was stepped downwards, to reverse any systematic effects. On shot 14 Prf was raised to 2.7 MW and one of the best H-modes of the day achieved. (150 kJ, relatively high and steady pedestal). Did not have a Bt sweep on this one. Shots 16 and 19 had progressively higher target densities, (nel 1.2, 1.4) in an attempt to get enhanced D-alpha H-mode. We found instead that this favoured the appearance of more Type III ELMs, and the Te pedestal was more quickly eroded. We thus decided to go the other direction and reduce the target density. Shots 20 and 22 were similar to 14, with good Bt sweeps. Shots 23, 24 and 25 had progressively less gas before RF. This favoured longer ELM-free periods, which alternated with L-mode; no ELMs in sight. There were long L-mode periods between H-modes, at comparable power and density, which may be interesting for threshold and confinement studies. Got a Te profile sweep in one or two of these too. The remainder of the run was devoted to the planned current scan. Shots 27-29 were 600 kA H-modes, which have rarely if ever been run before on C-Mod. 27 and 29 had Br sweeps. These H-modes had indications of enhanced D-alpha, especially 29 which had flat density and Prad late in the H-mode. It will be interesting to explore whether this is a reproducible effect at lower Ip. Shot 30 was at Ip=1.2 MA. The RF tripped early due to the big change in loading, and we did not get H-mode. Shot 31 had a TF fault, so we did not complete this part of the scan. In terms of pedestal measurements, data were obtained with both ECE, X-ray and xuv arrays, at both 600 kA and 1 MA. The reflectometer was unfortunately not available. Preliminary analysis of ECE data shows similar widths to the EDA H-modes measured in 1996, (~ 10-12 mm raw, 6-9 mm deconvolved) but the pedestals are apparently further in by ~6 mm. We need to check whether this is a real effect or indicates a systematic error in the calculation of GPC radii and/or EFIT flux surfaces. If real, it might explain the x-ray pedestal results. Pedestal heights, and confinement generally, are not as good as in our best 1996 discharges. Comparison of different diagnostics and scalings with conditions will be carried out in the next few weeks. All in all the run was quite successful, especially for this early in the run period. We showed that the Bt ramp technique could be used reliable and did not perturb the discharge or RF. Hopefully the missing parts of the MP (EDA, higher current, larger pedestals) can be obtained by piggybacking for a few shots once these conditions are obtained in other MPs. Thanks to the RF group and engineering and physics operators, especially to John Goetz for filling in at no notice midday!

Physics Operator Summaries

Entered: Jul 7 2004 04:36:58:160PM

Author: To Be Determined

Physics operator summary for run 971211 MP 188 : Edge pedestal measurements SL: Hubbard PO: Granetz/Goetz EO: Silva/Cochran/Bertolino Summary: This was a fairly successful run, with plenty of good edge ECE data, edge xray data, edge McPherson, etc. Most of the H-modes were ELM-free, but there was a definite EDA H-mode on shot 29 (at Ip=0.6 MA). The machine ran very well, with all but one discharge ramping nearly all the way down. There were no unusual engineering problems. Scorecard: 23 plasmas 6 fizzles 2 duds 0 tests ---------- 31 total ------------------------------------------------------------------------------ Run Plan for Thursday, 971211 MP 188 -- Pedestal measurements We will be obtaining H-modes at various plasma currents, and various densities. We may also put a small ramp in Btor to scan the GPC across the pedestal barrier. At the higher densities, we may need to raise Btor to 5.6 T to avoid cutoff of the GPC. Engineering setup for Thursday, 11 Dec 1997: Two hours of ECDC in deuterium before the run. Note: Boronization is scheduled the evening before this run. Engineering setup as on 971209006, with TF under hybrid control This is a 1 MA, 5.4 T shot, nl_04=1-2e20 m-2, 2.5 MW of RF, and H-modes. Gas setup - fill K-side with 20 PSI of D2, hybrid enable fill B-top with 6 PSI of D2, hybrid enable fill B-side-lower with 3 PSI of Ar, hybrid enable The following gate valves should be enabled, assuming no vacuum problems: ECE (no others until we verify the status of each system) ------------------------------------------------------------------------------- Detailed shot log: Note: the machine was boronized last night, followed by ECDC in deuterium and helium (boron: 105 nm average layer thickness, 00:40 hours of ECDC in D2 01:45 hours of ECDC in Helium Hybrid coldstart done; no errors found ($set default cmod$models:[hybrid.tcl] $@hybinit_dispatch $@show_bitbus_log Use editor to search for no "error" and no "not respond") Reload plasma shot 971209006 (from this past Tuesday) This is a 1 MA, 5.4 T shot, nl_04=1-2e20 m-2, Prf=2.5 MW, H-modes RF feedback on RCUR is NOT enabled (RF_LOAD_E = 0.0) Shot 01 -- Plasma. Good shot. Ip=1.0 MA, duration=1.57 s (no argon this shot) Prf reads only 0.8 MW, but it is apparently incorrect, because we had very good H-modes on this shot. nl_04 went from an L-mode value of 1.0e20 m-2 to an H-mode value of 2.4e20 m-2. We will break here for cell access to fix the Prf signal. Next shot: enable argon for Hirex. Shot 02 -- Plasma. Good shot. Prf is still not correct. Duration=1.44 s. Long period of ELMy H-modes. nl_04 reaches 2.7e20 m-2. We will break here again (Wukitch: "We got to go in the cell...something is toast") Next shot: lower L-mode density from nl_04=1.0 to 0.9e20 m-2 Shot 03 -- Fizzle. Looks like a little too much Bz. Next shot: Add -15 amps to EF4 (-1335 to -1350 amps). Shot 04 -- Plasma. Good shot. H-modes. Prf=2.3 MW. It took a long time to get into H-mode. Change to EF4 did exactly what I wanted it to. Next shot: no changes. Shot 05 -- Plasma. Good shot. H-modes. Prf=2.8, then 1.3 MW Next shot: Lower the RF power, and increase RCUR by 1 mm to reduce the outer gap by 2 mm. Shot 06 -- Plasma. Good shot. H-modes. Prf=2.3 MW, and very constant. Outer gap did indeed shrink by 2 mm. Again, it took a while for the plasma to go into H-mode. Next shot: reduce RF power some more. Shot 07 -- Plasma. Good shot. H-modes. Prf=2.2 MW. H-mode transition occurred sooner on this shot. Next shot: program a 5% upward sweep of Btor starting at 0.700 s, and returning down starting at 0.850 s. Shot 08 -- Plasma. Good shot. H-modes. Prf=2.2, then 1.0 MW. Btor ramped from 5.40 to 5.65 T and then back down again, just like we wanted. Next shot: Start the Btor ramp up 15 ms earlier (0.685 s). Also reduce argon puff from 28 to 24 ms. Shot 09 -- Plasma. Good shot. H-modes. Prf=2.2 MW. Good data on Btor rampup Next shot: reduce gas valve voltage programming starting at 0.2 s. Shot 10 -- Plasma. Good shot. H-modes. Prf=2.2 MW. Note: We saw a small amount of the TF cabinet #1 noise spike problem Next shot: Invert TF ramp, so that Btor now will ramp down 5% at t=0.685 s, and then ramp back at 0.850 s. Shot 11 -- Plasma. Good shot. H-modes. Prf=2.2 MW. Btor ramps down 4% and then back again. Next shot: raise RF power. Shot 12 -- Plasma. Good shot. H-modes. Prf=2.6 MW. May have had the beginnings of an EDA H-mode. Note: Mflux is indicating that Br at breakdown is slowly decreasing over the last several shots, but Ian's vacuum scope doesn't show any change. Next shot: remove Btor ramp, and raise Prf some more. Shot 13 -- Fizzle. Next shot: raise Br offset from 0.0065 to 0.007 T Shot 14 -- Plasma. Good shot. H-modes. Prf=2.9 MW. I have to leave unexpectedly. John Goetz will take over as physics operator. His logbook comments will continue to be made under my name. (I'll finish the physop report tomorrow using his logbook comments and my own post-run observations.) Next shot: raise density from nl_04=0.9 to 1.2e20 m-2. Shot 15 -- Fizzle. (JG: Looks like Bz is too negative (and not coming in fast enough) Next shot: add +10 amps to EF4 (-1350 to -1340 amps) Shot 16 -- Plasma. Good shot. H-modes, mostly ELM-free. Prf=2.9, then 1.3 MW. Next shot: raise density again from nl_04=1.2 to 1.4e20 m-2. Shot 17 -- Fizzle. (JG: fields look o.k.) Next shot: shorten pre-pulse gas puff from 18 to 16 ms. Shot 18 -- Dud. Multiple power supplies didn't fire. Magnet resistance fault. Next shot: try again. Joe Snipes set up fast sampling windows on magnetics, ECE, H-alpha, and XTOMO from t=1.0 to 1.15 s. Shot 19 -- Plasma. Good shot. H-modes, mostly ELM-free. Prf=2.8 MW. Next shot: Reduce density from nl_04=1.4 to 0.9e20 m-2. Increase RCUR by 1 mm (from .670 to .671 m) to decrease outer gap by 2 mm. Put in the 5% Btor rampup back in from 0.675 to 0.850 s. Shot 20 -- Plasma. Good shot. H-modes, but RF had multiple trips. Next shot: Move RCUR back where it was (from 0.671 back to 0.670 m). Begin Btor rampup 10 ms earlier (0.665 s instead of 0.675 s) Shot 21 -- Fizzle. (JG: fields look o.k. - Br may be a tad too high) Next shot: reduce Br offset from 0.007 to 0.0067 T, Shorten pre-pulse gas puff from 16 to 15 ms. Shot 22 -- Plasma. Good shot. H-modes, but RF had multiple trips. Next shot: turn on RF feedback of RCUR. Set RF_LOAD_E coefficient to -1000. Shot 23 -- Plasma. Good shot. H-modes. Prf=2.5 MW, with much better performance. Next shot: lower gas valve pre-programmed voltage to <10 V after t=0.4 s. Change RF_LOAD_E to -1250 (from -1000). Shot 24 -- Plasma. Good shot. H-modes, some good ELM-free ones, and a long L-mode period even though RF was at a constant 2.4 MW for >0.5 sec. Next shot: Change RF_LOAD_E to -1500 (from -1250), Decrease nl_04 from 0.9 to 0.65e20 m-2, and zero the gas valve pre-programmed voltage to zero after t=0.4 s. Shot 25 -- Plasma. Good shot. H-modes, some good ELM-free periods. Prf=2.5 MW, very constant for 0.55 s. Next shot: reduce density from nl_04=0.65 to 0.50e20 m-2, and zero the gas valve voltage programming starting at 0.3 s (was 0.4 s) Shot 26 -- Fizzle. (JG: Br a bit positive. Density o.k.) Next shot: lower plasma current to 0.6 MA (from 1.0 MA), Raise density from nl_04=0.65 to 0.9e20 m-2, and Reduce Br offset from 0.0067 to 0.0064 T. Shot 27 -- Plasma. Good shot. Ip=0.6 MA. H-modes. Prf=2.3 MW. Next shot: remove the 5% Btor ramping. Shot 28 -- Plasma. Good shot. Ip=0.6 MA. H-modes, with hints of EDA's. Density and Prad don't rise as much, fuzziness on the H-alpha. Lower edge xray signals. Prf=2.4-2.6 MW. Next shot: put 5% Btor rampup back in from 0.665 to 0.850 s. Move fast sampling window to t=0.64-0.77 s, in order to see L-H transition to EDA mode. Shot 29 -- Plasma. Good shot. Ip=0.6 MA. Definite EDA H-modes. Density and Prad flatten out from t=0.9 to 1.2 s. Prf=2.6 MW, and constant from 0.9 to 1.2 s. Edge x-ray signals low. Joe Snipes reports observation of fast edge modes (60 kHz) on inner wall coils from t=0.68-0.72 s. Next shot: raise Ip to 1.2 MA. Shot 30 -- Plasma. Good shot until it disrupted at 1.28 s, just into rampdown. Only one antenna on for most of the RF pulse. No H-modes. Next shot: no changes Shot 31 -- Dud. No TF. End of run.

Session Leader Comments
Dec 11 1997 09:09:08:740AM	971211001	Amanda Hubbard	Nice shot. 1.0 MA, very long H-mode. Big density rise, nel 1.1 to 2.5 m-2. Getting some ECE sutoff. Real RF power probably higher than the 800 kW posted (E-port power not being read). Short break while they check the cables.
Dec 11 1997 09:28:40:490AM	971211002	Amanda Hubbard	Good shot. 1.0 MA, very long H-mode, but more Type III ELMs. Te pedestal doesn't stay up as well as the last shot. Even bigger density rise, nel 1.1 to 2.7 m-2. Getting some ECE cutoff after 0.93 s. Real RF power is higher than the 1.5 MW posted (E-port power not being read). Another short break .
Dec 11 1997 10:18:12:970AM	971211003	Amanda Hubbard	Fizzle. Plan is to try 1.5 MW from D and 0.5 MW from E (which has the problems on power signal).
Dec 11 1997 10:30:39:380AM	971211004	Amanda Hubbard	Good plasma. Got 2.5 MW RF, and power signal now working. Stayed in L-mode an unusually long time (until 0.86 s). Not sure why. Several RF trips in the H-mode. Will balance power and retune for next shot. Mostly ELM-free, but some ELMs and D-alpha 'humps'.
Dec 11 1997 10:49:20:170AM	971211005	Amanda Hubbard	Good plasma. 2.8 MW RF, short elm-free H-mode with rapid increases in Prad and nel (1.1 to 2.2 e20). Followed by Elmy H-mode with 1.2 MW power. Need to extend H-mode duration. For next shot try 2 MW RF, reduce outer gap slightly.
Dec 11 1997 11:23:11:390AM	971211007	Amanda Hubbard	Good plasma. 2.0 MW RF, nice and steady. Elm-free H-mode starts earlier this time. For next shot, try Bt sweep.
Dec 11 1997 12:34:03:750PM	971211011	Amanda Hubbard	This time used a negative Bt sweep to check effect of time variation. Have been getting nice Te vs R data for past several shots, though time variation will be an issue. Next shot, raise Prf.
Dec 11 1997 12:47:51:530PM	971211012	Amanda Hubbard	Prf increase to 2.6 MW, nice and steady. The Dalpha trace was noticably higher. Also, the Te pedestal appears to be increasing before the sweep. For next shot, remove Bt sweep and increase Prf some more.
Dec 11 1997 02:21:37:900PM	971211019	Amanda Hubbard	Higher start density (1.4 e20 nel) with nice 2.8 MW RF. Leads to long H-mode with many Type 3 ELM periods. Lower Te pedestals, no sign of EDA.
Dec 11 1997 02:40:27:440PM	971211020	Amanda Hubbard	Lower start density, similar to 014. Nice ELM-free H-mode, but some RF trips. Gets to 150 kJ. H-mode started before ramp; move it earlier.
Dec 11 1997 03:09:51:450PM	971211022	Amanda Hubbard	Nice ELM-free H-mode. Got a good Te/Bt sweep in. Some RF trips.
Dec 11 1997 03:30:08:260PM	971211023	Amanda Hubbard	Lower start density. Nice ELM-free H-mode. Got a good Te/Bt sweeps in, giving profiles both in H-mode and (for reasons not well understood) an L-mode with comparable power.
Dec 11 1997 03:54:29:390PM	971211024	Amanda Hubbard	Similar to 023. Got good H and L-mode profiles.
Dec 11 1997 03:50:48:520PM	971211025	Amanda Hubbard	Another nice one. Several H and L-modes, no ELMs in sight. Wmhd up to 150 kJ. Good RF at 2.5 MW.
Dec 11 1997 04:23:22:990PM	971211027	Amanda Hubbard	600 kA worked first time! And had H-mode too. Prf 2.2 MW. Dalpha comes up. Got a Bt sweep - there may be some transient effects. For next shot turn off Bt sweep so we can see the time behaviour.
Dec 11 1997 04:49:42:610PM	971211028	Amanda Hubbard	As requested, 2.4 MW, no sweep. Looks like enhanced Dalpha! Fairly constant Te pedestal.
Dec 11 1997 04:54:20:040PM	971211029	Amanda Hubbard	600 kA. 2 clearly enhanced D-alpha H-modes. Prad, nel saturate. Got a nice pedestal sweep.
Dec 11 1997 05:07:44:240PM	971211030	Amanda Hubbard	1.2 MA. Shot ran until 1.27 seconds. RF trips early. Little if any H-mode. Some pretty strange behaviour around and after the RF.

Physics Operator Comments
Dec 11 1997 08:47:25:480AM		Robert Granetz	Run Plan for Thursday, 971211 MP 188 -- Pedestal measurements We will be obtaining H-modes at various plasma currents, and various densities. We may also put a small ramp in Btor to scan the GPC across the pedestal barrier. At the higher densities, we may need to raise Btor to 5.6 T to avoid cutoff of the GPC. Engineering setup for Thursday, 11 Dec 1997: Two hours of ECDC in deuterium before the run. Note: Boronization is scheduled the evening before this run. Engineering setup as on 971209006, with TF under hybrid control This is a 1 MA, 5.4 T shot, nl_04=1-2e20 m-2, 2.5 MW of RF, and H-modes. Gas setup - fill K-side with 20 PSI of D2, hybrid enable fill B-top with 6 PSI of D2, hybrid enable fill B-side-lower with 3 PSI of Ar, hybrid enable The following gate valves should be enabled, assuming no vacuum problems: ECE (no others until we verify the status of each system)
Dec 11 1997 08:48:37:270AM		Robert Granetz	Note: the machine was boronized last night, followed by ECDC in deuterium and helium (boron: 105 nm average layer thickness, 00:40 hours of ECDC in D2 01:45 hours of ECDC in Helium Hybrid coldstart done; no errors found ($set default cmod$models:[hybrid.tcl] $@hybinit_dispatch $@show_bitbus_log Use editor to search for no "error" and no "not respond") Reload plasma shot 971209006 (from this past Tuesday) This is a 1 MA, 5.4 T shot, nl_04=1-2e20 m-2, Prf=2.5 MW, H-modes RF feedback on RCUR is NOT enabled (RF_LOAD_E = 0.0)
Dec 11 1997 09:15:00:310AM	971211001	Robert Granetz	Shot 01 -- Plasma. Good shot. Ip=1.0 MA, duration=1.57 s (no argon this shot) Prf reads only 0.8 MW, but it is apparently incorrect, because we had very good H-modes on this shot. nl_04 went from an L-mode value of 1.0e20 m-2 to an H-mode value of 2.4e20 m-2. We will break here for cell access to fix the Prf signal. Next shot: enable argon for Hirex.
Dec 11 1997 09:26:39:540AM	971211002	Robert Granetz	Shot 02 -- Plasma. Good shot. Prf is still not correct. Duration=1.44 s. Long period of ELMy H-modes. nl_04 reaches 2.7e20 m-2. We will break here again (Wukitch: "We got to go in the cell...something is toast") Next shot: lower L-mode density from nl_04=1.0 to 0.9e20 m-2
Dec 11 1997 10:17:22:650AM	971211003	Robert Granetz	Shot 03 -- Fizzle. Looks like a little too much Bz. Next shot: Add -15 amps to EF4 (-1335 to -1350 amps).
Dec 11 1997 10:37:18:390AM	971211004	Robert Granetz	Shot 04 -- Plasma. Good shot. H-modes. Prf=2.3 MW. It took a long time to get into H-mode. Change to EF4 did exactly what I wanted it to. Next shot: no changes.
Dec 11 1997 10:47:53:880AM	971211005	Robert Granetz	Shot 05 -- Plasma. Good shot. H-modes. Prf=2.8, then 1.3 MW Next shot: Lower the RF power, and increase RCUR by 1 mm to reduce the outer gap by 2 mm.
Dec 11 1997 11:04:10:190AM	971211006	Robert Granetz	Shot 06 -- Plasma. Good shot. H-modes. Prf=2.3 MW, and very constant. Outer gap did indeed shrink by 2 mm. Again, it took a while for the plasma to go into H-mode. Next shot: reduce RF power some more.
Dec 11 1997 11:15:50:010AM	971211007	Robert Granetz	Shot 07 -- Plasma. Good shot. H-modes. Prf=2.2 MW. H-mode transition occurred sooner on this shot. Next shot: program a 5% upward sweep of Btor starting at 0.700 s, and returning down starting at 0.850 s.
Dec 11 1997 11:38:06:880AM	971211008	Robert Granetz	Shot 08 -- Plasma. Good shot. H-modes. Prf=2.2, then 1.0 MW. Btor ramped from 5.40 to 5.65 T and then back down again, just like we wanted. Next shot: Start the Btor ramp up 15 ms earlier (0.685 s)
Dec 11 1997 11:53:24:760AM	971211009	Robert Granetz	Shot 09 -- Plasma. Good shot. H-modes. Prf=2.2 MW. Good data on Btor rampup Next shot: reduce gas valve voltage programming starting at 0.2 s.
Dec 11 1997 12:13:50:170PM	971211010	Robert Granetz	Shot 10 -- Plasma. Good shot. H-modes. Prf=2.2 MW. Note: We saw a small amount of the TF cabinet #1 noise spike problem Next shot: Invert TF ramp, so that Btor now will ramp down 5% at t=0.685 s, and then ramp back at 0.850 s.
Dec 11 1997 12:28:43:100PM	971211011	Robert Granetz	Shot 11 -- Plasma. Good shot. H-modes. Prf=2.2 MW. Btor ramps down 4% and then back again. Next shot: raise RF power.
Dec 11 1997 12:44:24:580PM	971211012	Robert Granetz	Shot 12 -- Plasma. Good shot. H-modes. Prf=2.6 MW. May have had the beginnings of an EDA H-mode. Note: Mflux is indicating that Br at breakdown is slowly decreasing over the last several shots, but Ian's vacuum scope doesn't show any change. Next shot: remove Btor ramp, and raise Prf some more.
Dec 11 1997 12:56:39:770PM	971211013	Robert Granetz	Shot 13 -- Fizzle. Next shot: raise Br offset from 0.0065 to 0.007 T
Dec 11 1997 01:26:35:960PM	971211014	Robert Granetz	Shot 14 -- Plasma. Good shot. 5 H-modes. Prf=3 MW. Next shot: draw NL04 to 1.2e20 (was 0.9).
Dec 12 1997 10:03:07:350AM	971211014	Robert Granetz	Shot 14 -- Plasma. Good shot. H-modes. Prf=2.9 MW. I have to leave unexpectedly. John Goetz will take over as physics operator. His logbook comments will continue to be made under my name. (I'll finish the physop report tomorrow using his logbook comments and my own post-run observations.)
Dec 11 1997 01:28:11:530PM	971211015	Robert Granetz	Shot 15 -- Fizzle. Looks like Bz is too negative ( and not coming in fast enough). Next shot: Draw IC_EF4 to -1340A (was -1350)
Dec 12 1997 09:39:33:840AM	971211016	Robert Granetz	Shot 16 -- Plasma. Good shot. 4 H-modes. Longer ELM-free period one antenna crapped out. next shot - draw NL04 to 1.4e20
Dec 11 1997 01:55:34:330PM	971211017	Robert Granetz	Shot 17 Fizzle - fields look o.k. Next shot: remove 2msec of pre-puff length (to 16msec)
Dec 11 1997 02:00:15:150PM	971211018	Robert Granetz	Shot 18 Dud. Magnet resistance fault. next try, try again
Dec 11 1997 02:18:47:500PM	971211019	Robert Granetz	Shot 19 Plasma. Good shot. 8 H-modes but the density doesn't have time to fall in between. (500msec length) 450msec of 3MW. Next shot: draw NL04 to 0.9e20 (from 1.4e20) draw RCUR to .671 (from .670) 5% Bt ramp up from .675 to .85sec
Dec 11 1997 02:35:27:210PM	971211020	Robert Granetz	Shot 020 Plasma - 4 short H-modes - tough shot for the RF next shot Bt ramp to begin at .665sec RCUR back to 0.670
Dec 11 1997 02:45:09:920PM	971211021	Robert Granetz	Shot 21 Fizzle - fields look o.k. - Br maybe a tad too high Next shot lower pre-puff to 15msec Br_0 offset to .0067T
Dec 11 1997 03:05:02:760PM	971211022	Robert Granetz	Shot 22 Plasma. Good shot. 4 short H-modes. Another tough shot for the RF. NL04 at 10msec is 2e18 (was 2x this on shot 21) next shot NL04 to 0.7e20 (was 0.9e20) lower the RF power a tad
Dec 11 1997 03:09:15:950PM	971211022	Robert Granetz	for shot 23: RF_LOAD_E in RCUR to -1000 (was 0)
Dec 11 1997 03:22:14:770PM	971211023	Robert Granetz	Shot 23 Plasma. Good shot. 5 H-modes. next shot lower PG3 to <10V after 0.4sec RF_LOAD_E = -1250
Dec 11 1997 03:37:46:110PM	971211024	Robert Granetz	Shot 24 Plasma. Good shot. 4 H-modes. 2.5MW of RF and solid. Long L-mode period. next shot RF_LOAD_E to -1500 NL04 = 0.65e20 and PG3 to zero after 0.4sec
Dec 12 1997 10:23:01:500AM	971211025	Robert Granetz	Shot 25 Plasma. Good shot. 6 H-modes. 0.55sec of 2.5MW RF pulse! next shot NL04 = 0.5e20 and PG3 to zero around 0.3sec
Dec 11 1997 04:05:58:750PM	971211026	Robert Granetz	Shot 26 Fizzle. Br a bit positive. Density o.k. next shot IP = -600000 NL04 = 0.9e20 BR_0 offset = .0064
Dec 11 1997 04:21:33:770PM	971211027	Robert Granetz	Shot 27 Plasma. 600kAmps. 5 H-modes. 2.2MW with one trip. possible EDA on the first H-mode transition next shot remove the TF ramp
Dec 11 1997 04:33:33:590PM	971211028	Robert Granetz	Shot 28 Plasma. Good shot. Weird H-modes (some EDA characteristics). Next shot 5% TF ramp up at .665sec until .85sec
Dec 11 1997 04:49:41:960PM	971211029	Robert Granetz	Shot 29 Plasma. Good shot. Definite sighting of EDA from 0.9 to 1.2sec. next shot IP = 1.2MA same density
Dec 11 1997 05:03:12:060PM	971211030	Robert Granetz	Shot 30 Plasma. 1.2MA. Only one antenna stayed on. Disrupts @ 1.3sec (1MA) next shot try again
Dec 11 1997 05:06:40:260PM	971211031	Robert Granetz	Shot 31 Dud. No TF (pulled before the shot)

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:54:42:880AM	Plasma	Ok
2	09:16:28:660AM	Plasma	Ok
3	10:08:40:830AM	Plasma	Ok
4	10:19:11:880AM	Plasma	Ok
5	10:34:34:420AM	Plasma	Ok
6	10:49:40:140AM	Plasma	Ok
7	11:10:02:380AM	Plasma	Ok
8	11:22:55:070AM	Plasma	Ok
9	11:43:07:460AM	Plasma	Ok
10	11:55:26:660AM	Plasma	Ok
11	12:16:10:360PM	Plasma	Ok
12	12:33:21:760PM	Plasma	Ok
13	12:45:33:500PM	Plasma	Ok
14	01:05:42:390PM	Plasma	Ok
15	01:20:12:300PM	Plasma	Ok
16	01:32:49:220PM	Plasma	Ok
17	01:46:55:550PM	Plasma	Ok
18	01:58:12:670PM	Plasma	Ok
19	02:05:18:700PM	Plasma	Ok
20	02:22:24:000PM	Plasma	Ok
21	02:37:24:840PM	Plasma	Ok
22	02:50:44:470PM	Plasma	Ok
23	03:11:03:360PM	Plasma	Ok
24	03:25:19:340PM	Plasma	Ok
25	03:39:37:120PM	Plasma	Ok
26	03:56:41:920PM	Plasma	Ok
27	04:07:18:610PM	Plasma	Ok
28	04:22:55:410PM	Plasma	Ok
29	04:35:56:260PM	Plasma	Ok
30	04:52:33:860PM	Plasma	Ok
31	05:04:19:880PM	Plasma	Bad	NO TF