Miniproposals

Miniproposal: 170a Date Filed: 5/13/1997 Title: Restart Operation: May 1997 First Author: Robert Granetz Session Leader: Steve Wolfe (shots 1-31)

Engineering Operator Run Comment

MP170A from 971030015/Granetz/Silva

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:17:240PM

Author: To Be Determined

Session Leader Summary for Tuesday, 971104 SL: wolfe PO: granetz EO: silva/cochrane/bertolino MP 170A Start-up and 148 RF Conditioning The object of this run is to get routine plasma operation and check out diagnostics while getting the RF conditioned. Good progress was made toward these goals. Plasmas were reasonably reproducible (13 plasmas, 8 fizzles, 2 power supply related duds, and 8 tests; most fizzles before we got rid of the early radial field thrash). It was necessary to change the Br offset and EF4 current significantly from last week's values, more in line with previous (June) settings. We discovered that the radial field thrash previously observed just after breakdown was due to voltage programming on oh2 and ef2 supplies that was not up-down symmetric. This was fixed on shot 17. E-port antenna was conditioned up to 1.7 MW at end of a ramp, and run at 1.3MW flattop, resulting in elmy h-modes. GPC was checked out and a setup error on channels 7-9 found and fixed. The rf loading feedback circuit was checked out; the circuit appears to be operating correctly, but the one attempt to use it (shot 31) failed because its bias and/or gate were not set up correctly. There were several problems during today's run: ------------------------------------------------- The k-side duty-cycle valve driver failed, resulting in a runaway shot and hard disruption on shot #7, the first plasma shot of the day. The driver was replaced by a direct driver for several shots, then a repaired duty factor board at shot 21 (test shot). Also, the b-side upper driver (Ar valve) failed while the k-side board was being worked on after shot 7. The HV board for this valve was also replaced before shot 22. TCI alignment went out before or during shot 7, which would have caused a different problem with density feedback had the gas valve not also failed. We left density feedback off until Irby was convinced that the alignment had stabilized (shot 18). The shot 7 disruption caused a tf crowbar and blown fuses in the TF and EF4. The first crowbar was on OH2U. There were two power supply failures, resulting in duds, on shot 4 (no OH1) and shot 16 (no TF). The first was probably the result of backing out of the shot after INIT, as has been found previously, but the shot 16 problem was unexplained. The most potentially serious problem was the appearance of spikes or glitches on the hybrid outputs (Mout) observed on shots 20-23 (and perhaps earlier). On shot 23 in particular, the spikes were full scale (10V) and may have caused the chopper to do the wrong thing, leading to a disruption. The glitches seem to originate in the PID stage, with smaller, less frequent glitches showing up on the Aout (error signals) and even on a few inputs. The glitches seem to start at the time that Ip referenced feedback gains turn on, or perhaps derivative gains, around t=0, with no glitches earlier. The glitches did not re-appear on hybrid-only test shots after shot 23, or on test or full shots from 24-31. This could be an indication of an intermittant problem on the PID stage or a power supply problem. It was not possible to diagnose the problem further because it disappeared after shot 23. Details: --------- We started with a copy of 971030015, but with density feedback enabled and clearin set to -8mm instead of -5mm, to avoid the vertical instability we got on 971030016. Shots 1-2 were no power cycles to check the operation of the Ross relays Shot 3 was the Tuesday oh test shot 4 was a dud (no OH1) shot 5-6 were fizzles; adjusted Br and Bz shot 7: plasma; disrupted at 1.2 sec. NO PG3 gas; the duty cycle driver died; also the density feedback was screwed because the TCI alignment went out. There was a current hesitation early. RF got 1.5kW in. shot 8-10: gas tests. Replaced duty cycle board with direct driver, while Willy fixes the chopper board. shot 11: plasma, full length; density feedback disabled until we confirm TCI alignment. Still a long hesitation. RF got 15kW in. Now the B-side lower valve (Ar) is dead shot 12: no changes:fizzle. shot 13: Adjust br, ef4. fizzle. shot 14-15: tweak br,bz. fizzles. shot 16: Notice and fix non-symmetric programing on oh2 and ef2 voltages in seg 1. Dud - no tf shot 17: plasma, got rid of br thrash. shot 18: density feedback back on. plasma, rf=.3MW shot 19: repeat. rf to 350kW from E-port. Dport is getting a fault indication shot 20: repeat, fizzled. There are some glitches on the Mout signals betweem t=0 and .15 sec shot 21: replace duty-cycle board on k-side and HV board on B-side lower. gas pulse test. Still see some glitches on MOUT channels shot 22: plasma, Argon working, RF=.6MW shot 23: disruption at .6 sec; lots of +/- 10V glitches on hybrid Mouts. May have caused disruption by driving chopper? Take some test shots to try to trace where glitches come from, but they go away on their own! shot 24: gas pulse and TS laser only; no glitches shot 25: oh plc test; no glitches shot 26: full shot. Plasma, no glitches from hybrid. rf>1MW, dithering h-mode. shot 27: plasma, rf up to 1.7MW shot 28: repeat, setting up rf feedback signal shot 29-30: good plasmas with elmy h-modes. RF flattop around 1.4MW shot 31: try turning on rf loading feedback, but it causes a disruption at t=.87sec

Physics Operator Summaries

Entered: Jul 7 2004 04:36:58:020PM

Author: To Be Determined

Physics operator summary for run 971104 MP 170A: Re-start C-Mod MP 148 : 80 MHz RF conditioning SL: Wolfe PO: Granetz EO: Cochran/Bertolino Summary: Considering this was only our second plasma run of this campaign, things went very well. The E-port ICRF system has essentially been conditioned, having launched up to 1.6 MW into the plasma, which was enough to give some very ELMy H-modes. The D-port system was not working today. Also, the RF position feedback control needs some more fiddling, although the circuit was working. We had 13 plasmas, with most extending well into rampdown. Several problems with gas valve driver boards were found, and fixed. A mysterious problem with noise spikes on the hybrid computer outputs was seen on several shots (21, 22, 23), but went away on its own. This should probably be monitored during the next few runs; it may be an early indication of a power supply going bad. We also found that symmetrizing the OH2 and EF2 pre-programmed voltages (done just prior to shot 17) does wonders for balancing out the stray Br field during breakdown and early rampup. WARNING: the last shot used the RF position feedback signal in the hybrid RCUR estimator. This seemed to cause some problems, so be careful if you plan on using the PCS programming from this shot. DO NOT COPY the PCS from any shot before 017, since the OH2 and EF2 voltages were not yet symmetrized. Scorecard: 13 plasmas 7 fizzles 2 duds (both due to a power supply failing to turn on) 9 tests ---------- 31 total ------------------------------------------------------------------------------ Run Plan for Tuesday, 971104 MP 170A -- Restart plasma operation, and begin conditioning 80 MHz ICRF Engineering setup for Tuesday, 04 Nov 1997: Two hours of ECDC in deuterium before the run, if possible. Engineering setup as on 971030015, with TF under hybrid control Plasma current to be set for 0.8 MA Segment 1 startup will be copied from 971030015 Density to be set for nl_04=1.0e20 m-2, if TCI is available, else use the pre-programmed gas valve trace from the setup shot. 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 4 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: this is the first run after last week's boronization. Note: about 1.5 hours of ECDC was done prior to this run. 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 from last Thursday (971030015), which has Ip=0.8 MA and Bt=5.3 T. Turn nl_04 feedback back on. Gain is set at 4, starting at 0.082 s. Move CLEARIN in by 3 mm (change from -5 to -8 mm) to improve vertical stability (since the setup shot had a VDE disruption). Shot 01 -- Test of Ross relays Shot 02 -- Another test of Ross relays. Shot 03 -- Usual OH-only test shot. Looks okay. Next shot: try for plasma. Shot 04 -- Dud. No OH1. Shot 05 -- Fizzle. Very bad Br. Next shot: increase BR offset from 0.003 to 0.006 T Shot 06 -- Fizzle. Bz too negative, Br better, but not all the way there yet. Next shot: increase EF4 by +50 amps, increase BR offset to 0.007 mT Shot 07 -- Plasma. Disrupted at 1.3 s, perhaps because the density feedback signal failed. The nl_04 signal claims only 0.5e20 m-2, but Jim says that is too low. There was a growing Z oscillation leading to the VDE. TF crowbarred. Steve reports that the K-side valve (which is our main fueling valve) didn't fire, even though the hybrid was putting out full voltage. Next shot: turn off density feedback. Shot 08 -- Test of new K-side valve driver board. (Willy has just replaced/worked on the board.) Valve didn't open. Shot 09 -- Another test of K-side valve driver board, but this time using the old direct analog signal (not the chopper signal). This one worked. Shot 10 -- Another test of K-side valve driver board, this time using the chopper signal. No gas. Next shot: run the gas valve with the direct analog signal (i.e. with the bypass in). Willy is debugging the duty cycle board offline. About 1 hr 40 min have elapsed between the last plasma shot (007) and the start of the next plasma shot (011). Shot 11 -- Plasma, nice shot. Duration=1.67 s. NL_04=0.8-1.0e20 m-2. John Rice reports no argon. He's right, B-side-lower didn't open, even though the proper pulse came out of the hybrid. Teeny weeny amounts of RF (like 15 kW). Next shot: no changes. Shot 12 -- Fizzle. Not was not all that bad. Next shot: reduce BR offset by 1 mT (to 0.006 mT) and raise EF4 current by 15 amps (to -1350 A). Shot 13 -- Fizzle. Pretty good null. Next shot: raise BR offset back to 0.007 mT Shot 14 -- Fizzle. Very good null. Next shot: no changes. Shot 15 -- Fizzle. Next shot: symmetrize the OH2U and L voltage programming. Copy upper to lower. Shot 16 -- Dud. No TF. Next shot; symmetrize the EF2U and L voltage programming as well. Copy upper to lower. Shot 17 -- Plasma, good shot. Duration=1.68 s. NL_04=0.9-1.0e20 m-2. Prf=50 kW. Next shot: turn density feedback back on, with a gain of 4. Shot 18 -- Plasma, good shot. Duration=1.68 s. Density feedback worked well. NL_04=1.0e20 m-2. Prf=0.3 MW. Next shot: no changes. Shot 19 -- Plasma, good shot. Duration=1.68 s. Prf=0.35 MW. Next shot: no changes. Shot 20 -- Fizzle. Null looks good. Next shot: increase EF4 by +15 amps (from -1350 to -1335 amps) There's a break here for cell access for Willy to put back the repaired chopping valve driver board. He'll also look at the problems with the argon valve. Amanda is going into the ECE lab to check on why channels 7,8, and 9 are not working. Shot 21 -- Test shot to check valves. Main fueling valve is working (K-side). Don't know about the argon valve. Shot 22 -- Plasma. Disrupted at 1.29 s. I_halo_lower=100 kA. Prf=0.6 MW No H-modes. Lots of argon Next shot: no changes. Shot 23 -- Plasma, but disrupted at 0.63 s. I_halo_L=134 kA. EFC was thrashing alot for the entire shot. Lots of noise spikes coming out of hybrid (this has been getting worse for at least the last few shots). There were many camac DAQ errors on this shot as well. Shot 24 -- Test shot to check hybrid noise spikes. No power supplies enabled. No spikes. Shot 25 -- OH-only test shot, again to check the hybrid. No spikes. Next shot: try for plasma again. Shot 26 -- Plasma. Ramps halfway down before it disrupts at t=1.45 s. Prf=1.2 MW. No H-modes. No spikes on hybrid. Next shot: no changes. Shot 27 -- Plasma. Ramps halfway down before it disrupts at t=1.46 s. Prf=1.7 MW. Hints of things happening on the H-alpha, density, etc. Magnetics Traq-2 data was corrupted. Next shot: no changes. Shot 28 -- Plasma. Ramps halfway down before it disrupts at t=1.43 s. Prf=1.6 MW. More hints of things happening on the H-alpha, density, etc. Next shot: no changes, except set up fast sampling windows from t=0.930 to 1.077 s. Shot 29 -- Plasma. Ramps halfway down before it disrupts at t=1.44 s. Prf=1.3 MW for 0.3 s. Very ELMy. Next shot: no PCS changes, but RF position feedback signal is enabled to the hybrid. The hybrid will not use it though. Shot 30 -- Plasma. Ramps halfway down before it disrupts at t=1.46 s. Prf=1.3-1.6 MW for 0.3 s. Very ELMy. Next shot: Turn on hybrid usage of the RF position feedback signal. Shot 31 -- Plasma. Disrupted at 0.86 s, perhaps due to the RF position feedback control signal. I_halo_L=126 kA. End of run.

Session Leader Comments
Nov 4 1997 08:22:55:770AM		Steve Wolfe	D2 ECDC run from 06:30 to 08:15 There is a problem on one CAMAC highway: Date: 4-NOV-1997 08:19 Expires: 6-NOV-1997 08:14 From: SENSEI::BELLOFATTO Subj: gka3 GKA3 (also known as) gkd3 (also know as daq3) seems to not know what it is. I have notified the Josh and Tom who will I am sure will correct the problem. Other than that the highways seem to be OK. Dave B. Alternator is coming up ok so far (1137rpm@08:22)
Nov 4 1997 08:29:35:130AM		Steve Wolfe	Doing a coldstart (HYBINIT_DISPATCH.COM;2) at 08:24 (completed at 08:27) Log files look ok after coldstart.
Nov 4 1997 08:35:18:150AM	971104001	Steve Wolfe	Shot 1: system cycle only to check Ross relay behavior Relays don't seem to have closed back in (> 2minutes into recool)
Nov 4 1997 09:06:55:550AM	971104002	Steve Wolfe	shot 2: another cycle test for Ross relays After this shot, JAS will reboot DAQA to try to revive the former DAQ1 highway relays worked this time.
Nov 4 1997 09:31:31:180AM	971104003	Steve Wolfe	shot 3: Tuesday test; CAMAC now working according to T&J ECE data looks ok. OH test ok.
Nov 4 1997 09:52:54:100AM	971104004	Steve Wolfe	shot 4: First plasma attempt of the day. CLEARIN reduced to -8mm (from -5 last week) Back out of CHECK -> RECOOL; problem on engineering setup. Trying again. Dud. No OH1 !?
Nov 4 1997 10:03:12:300AM	971104005	Steve Wolfe	shot 5: retry (hopefully with all supplies) fizzle. late breakdown 11msec Negative radial field, about -3mT; EF4 balance looks good.
Nov 4 1997 10:11:28:010AM	971104006	Steve Wolfe	shot 6: Changed Br offset back to 6mT; why is it different today?? fizzle. This time there was 20amps imbalance on EF4's. Still a late breakdown. Br still negative, Bz also negative.
Nov 4 1997 10:23:30:680AM	971104007	Steve Wolfe	shot 7: tweak ef4 current for more positive Bz. Plasma , disrupted, TF crowbar. density feedback failed. early bd, long hesitation. still negative bz
Nov 4 1997 11:19:34:030AM	971104008	Steve Wolfe	shot 8: Gas test for Willy to check K-side valve. On shot 7, k-side valve did not go, although hybrid output is full on. NL4 feedback signal was negative due to alignment problem. Didn't get the pulse; CAMAC errors on the output signals.
Nov 4 1997 11:25:24:380AM	971104009	Steve Wolfe	shot 9: Another gas test for Willy to check K-side valve. Got an unchopped signal through; see gas on gage and on ratiomatic.
Nov 4 1997 11:32:35:750AM	971104010	Steve Wolfe	shot 10: Another gas test. This time with a chopper board. No gas. no chops.
Nov 4 1997 12:10:45:870PM	971104011	Steve Wolfe	shot 11: Turn off density feedback; get rid of late pulse on B-top (PG4). Now using a direct drive on k-side (pg3) until Willy fixes the duty-cycle board. plasma to 1.7 sec. No changes for next shot.
Nov 4 1997 12:18:44:320PM	971104012	Steve Wolfe	shot 12: no changes. fizzle. bz still negative, br a bit more positive.
Nov 4 1997 12:45:45:450PM	971104013	Steve Wolfe	shot 13: tweak ef4 and br0. fizzle.
Nov 4 1997 12:55:38:190PM	971104015	Steve Wolfe	shot 14: br0 back where it was. fizzle.
Nov 4 1997 12:56:22:460PM	971104015	Steve Wolfe	shot 15: no change. fizzle
Nov 4 1997 01:05:13:350PM	971104015	Steve Wolfe	shot 15: no change. fizzle. There is asymmetric voltage programming on oh2's and EF2's, vupper > vlower in both cases. This is an ancient mysterious thing, which seems to be doing the wrong thing, since we are observing a negative Br thrash.
Nov 4 1997 01:09:54:310PM	971104016	Steve Wolfe	shot 16: copy upper into lower on V_oh2 in seg 1. dud - no tf.
Nov 4 1997 01:21:23:430PM	971104017	Steve Wolfe	shot 17: copy upper into lower on V_oh2 and V_ef2 in seg 1. plasma almost all the way down. br thrash is mostly gone. Still a little hesitation, but better. RF to 50kW. TCI looks ok, try turning nl feedback on for next shot.
Nov 4 1997 01:33:29:290PM	971104018	Steve Wolfe	shot 18: turn on density feedback again. plasma, same length. injection at 1.07 sec, starts a small vertical oscillation. rf to 300kW. density looks good and flat. Amanda has a problem with channels 7-9 of gpc. Still no Argon pulse for John.
Nov 4 1997 01:46:03:770PM	971104019	Steve Wolfe	shot 19: no changes. plasma. Still a burst of vertical at 1.03 or so, with no injection. Willy has a repaired board for the gas, but wait for Wukitch to get his tuning/conditioning better. rf to 350kW (E-port) ; D-port is having an "artificial trip"
Nov 4 1997 02:42:00:430PM	971104021	Steve Wolfe	shot 21: Willy has replaced the duty-cycle board on K-side and swapped the HV board on B-side lower. This will be a gas pulse test only. Got gas. looks like pg3 is ok, fizzle detector took out Ar pulse.
Nov 4 1997 02:53:13:520PM	971104022	Steve Wolfe	shot 22: back to plasma attempts. plasma - disruption @ 1.3sec. RF got to .6MW, Argon pulse at .3 sec. Still no channel 7-9 on GPC
Nov 4 1997 03:07:51:180PM	971104023	Steve Wolfe	shot 23: no changes. disrupts at .6 sec. Vertically unstable from the beginning. Lots of glitches on the hybrid outputs; this looks like trouble.
Nov 4 1997 03:42:46:450PM	971104025	Steve Wolfe	shot 25: OH PLC test. Still trying to see what causes glitches on hybrid. Glitches are gone? I have no idea what was causing them. Run a full shot and see if they come back.
Nov 4 1997 04:02:19:360PM	971104026	Steve Wolfe	shot 26: Set up for a full shot. see if the glitches come back. plasma, full length. glitches are gone. RF > 1MW; still only E-port. The glitches seem to be coming from the PID stage on the earlier shots.
Nov 4 1997 04:06:40:830PM	971104027	Steve Wolfe	shot 27: repeat. plasma rf to 1.7MW (still just E-port) still no glitches. Maybe a dither into H-mode around .9 sec?
Nov 4 1997 04:20:58:480PM	971104028	Steve Wolfe	shot 28: repeat rf to 1.6-1.7 MW rf loading feedback is doing what it is supposed to on this test. Mike has set up a triangle bias level. The circuit puts out +.5V from .8 sec to .95, then ramps down to 0. by 1.0. Some small h-modes around .9sec.
Nov 4 1997 04:45:35:970PM	971104029	Steve Wolfe	shot 29: repeat. except Bob tried to set a fast sample window during the h-mode time, and it gave him an error. plasma to 1.43 sec ELMy h-mode from .85 sec to 1.17, density flat at 1.5e20 nl4, 2pi bolo also flat during rf. rf at 1.3MW Amanda now has channel 9 up on the GPC
Nov 4 1997 04:47:41:970PM	971104030	Steve Wolfe	shot 30: repeat. plasma - similar to 29. EFIT had stalled because of low disk space on cmod$models /user=cmod$mhd. DId a purge on efit_work, and ran shot 28 and 29 manually.
Nov 4 1997 05:05:55:280PM	971104031	Steve Wolfe	shot 31: set up RCUR rf_load for gain=-1500. Wukitch says it's ready. Disruption at .87 sec; it was the RCUR feedback. The sudden jump in RCUR error when the feedback comes on apparently drives the derivative gain crazy.

Physics Operator Comments
Nov 4 1997 09:07:25:080AM		Robert Granetz	Run Plan for Tuesday, 971104 MP 170A -- Restart plasma operation, and begin conditioning 80 MHz ICRF Engineering setup for Tuesday, 04 Nov 1997: Two hours of ECDC in deuterium before the run, if possible. Engineering setup as on 971030015, with TF under hybrid control Plasma current to be set for 0.8 MA Segment 1 startup will be copied from 971030015 Density to be set for nl_04=1.0e20 m-2, if TCI is available, else use the pre-programmed gas valve trace from the setup shot. 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 4 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)
Nov 4 1997 09:40:11:090AM		Robert Granetz	Detailed shot log: Note: this is the first run after last week's boronization. Note: about 1.5 hours of ECDC was done prior to this run. 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 from last Thursday (971030015), which has Ip=0.8 MA and Bt=5.3 T. Turn nl_04 feedback back on. Gain is set at 4, starting at 0.082 s. Move CLEARIN in by 3 mm (change from -5 to -8 mm) to improve vertical stability (since the setup shot had a VDE disruption).
Nov 4 1997 09:08:13:320AM	971104001	Robert Granetz	Shot 01 -- Test of Ross relays
Nov 4 1997 09:10:15:230AM	971104002	Robert Granetz	Shot 02 -- Another test of Ross relays.
Nov 4 1997 09:30:18:030AM	971104003	Robert Granetz	Shot 03 -- Usual OH-only test shot. Looks okay.
Nov 4 1997 09:50:09:370AM	971104004	Robert Granetz	Shot 04 -- Dud. No OH1.
Nov 4 1997 10:02:03:870AM	971104005	Robert Granetz	Shot 05 -- Fizzle. Very bad Br. Next shot: increase BR offset from 0.003 to 0.006 T
Nov 4 1997 10:13:11:270AM	971104006	Robert Granetz	Shot 06 -- Fizzle. Bz too negative, Br better, but not all the way there yet. Next shot: increase EF4 by +50 amps, increase BR offset to 0.007 mT
Nov 4 1997 10:30:43:840AM	971104007	Robert Granetz	Shot 07 -- Plasma. Disrupted at 1.3 s, perhaps because the density feedback signal failed. The nl_04 signal claims only 0.5e20 m-2, but Jim says that is too low. There was a growing Z oscillation leading to the VDE. TF crowbarred. Steve reports that the K-side valve (which is our main fueling valve) didn't fire, even though the hybrid was putting out full voltage. Next shot: turn off density feedback.
Nov 4 1997 11:16:33:610AM	971104008	Robert Granetz	Shot 08 -- Test of new K-side valve driver board. (Willy has just replaced/worked on the board.) Valve didn't open.
Nov 4 1997 11:32:24:170AM	971104009	Robert Granetz	Shot 09 -- Another test of K-side valve driver board, but this time using the old direct analog signal (not the chopper signal). This one worked.
Nov 4 1997 11:49:47:100AM	971104010	Robert Granetz	Shot 10 -- Another test of K-side valve driver board, this time using the chopper signal. No gas. Next shot: run the gas valve with the direct analog signal (i.e. with the bypass in). Willy is debugging the duty cycle board offline.
Nov 4 1997 12:11:36:760PM	971104011	Robert Granetz	Shot 11 -- Plasma, nice shot. Duration=1.67 s. NL_04=0.8-1.0e20 m-2. John Rice reports no argon. He's right, B-side-lower didn't open, even though the proper pulse came out of the hybrid. Teeny weeny amounts of RF (like 15 kW). Next shot: no changes.
Nov 4 1997 12:19:08:970PM	971104012	Robert Granetz	Shot 12 -- Fizzle. Not was not all that bad. Next shot: reduce BR offset by 1 mT (to 0.006 mT) and raise EF4 current by 15 amps (to -1350 A).
Nov 4 1997 12:42:31:670PM	971104013	Robert Granetz	Shot 13 -- Fizzle. Pretty good null. Next shot: raise BR offset back to 0.007 mT
Nov 4 1997 12:53:30:270PM	971104014	Robert Granetz	Shot 14 -- Fizzle. Very good null. Next shot: no changes.
Nov 4 1997 01:05:22:110PM	971104015	Robert Granetz	Shot 15 -- Fizzle. Next shot: symmetrize the OH2U and L voltage programming. Copy upper to lower.
Nov 4 1997 01:11:36:730PM	971104016	Robert Granetz	Shot 16 -- Dud. No TF. Next shot; symmetrize the EF2U and L voltage programming as well. Copy upper to lower.
Nov 4 1997 01:20:59:490PM	971104017	Robert Granetz	Shot 17 -- Plasma, good shot. Duration=1.68 s. NL_04=0.9-1.0e20 m-2. Prf=50 kW. Next shot: turn density feedback back on, with a gain of 4.
Nov 4 1997 01:31:08:580PM	971104018	Robert Granetz	Shot 18 -- Plasma, good shot. Duration=1.68 s. Density feedback worked well. NL_04=1.0e20 m-2. Prf=0.3 MW. Next shot: no changes.
Nov 4 1997 01:44:47:300PM	971104019	Robert Granetz	Shot 19 -- Plasma, good shot. Duration=1.68 s. Prf=0.35 MW. Next shot: no changes.
Nov 4 1997 01:59:47:530PM	971104020	Robert Granetz	Shot 20 -- Fizzle. Null looks good. Next shot: increase EF4 by +15 amps (from -1350 to -1335 amps)
Nov 4 1997 02:33:33:670PM	971104021	Robert Granetz	Shot 21 -- Test shot to check valves. Main fueling valve is working (K-side). Don't know about the argon valve.
Nov 4 1997 02:52:35:420PM	971104022	Robert Granetz	Shot 22 -- Plasma. Disrupted at 1.29 s. I_halo_lower=100 kA. Prf=0.6 MW No H-modes. Lots of argon Next shot: no changes.
Nov 4 1997 03:35:32:890PM	971104023	Robert Granetz	Shot 23 -- Plasma, but disrupted at 0.63 s. I_halo_L=134 kA. EFC was thrashing alot for the entire shot. Lots of noise spikes coming out of hybrid (this has been getting worse for at least the last few shots). There were many camac DAQ errors on this shot as well.
Nov 4 1997 03:35:47:400PM	971104024	Robert Granetz	Shot 24 -- Test shot to check hybrid noise spikes. No power supplies enabled. No spikes.
Nov 4 1997 03:41:57:600PM	971104025	Robert Granetz	Shot 25 -- OH-only test shot, again to check the hybrid. No spikes. Next shot: try for plasma again.
Nov 4 1997 03:56:38:650PM	971104026	Robert Granetz	Shot 26 -- Plasma. Ramps halfway down before it disrupts at t=1.45 s. Prf=1.2 MW. No H-modes. No spikes on hybrid. Next shot: no changes.
Nov 4 1997 04:07:49:540PM	971104027	Robert Granetz	Shot 27 -- Plasma. Ramps halfway down before it disrupts at t=1.46 s. Prf=1.7 MW. Hints of things happening on the H-alpha, density, etc. Magnetics Traq-2 data was corrupted. Next shot: no changes.
Nov 4 1997 04:17:34:020PM	971104028	Robert Granetz	Shot 28 -- Plasma. Ramps halfway down before it disrupts at t=1.43 s. Prf=1.6 MW. More hints of things happening on the H-alpha, density, etc. Next shot: no changes, except set up fast sampling windows from t=0.930 to 1.077 s.
Nov 4 1997 04:53:20:760PM	971104029	Robert Granetz	Shot 29 -- Plasma. Ramps halfway down before it disrupts at t=1.44 s. Prf=1.3 MW for 0.3 s. Very ELMy. Next shot: no PCS changes, but RF position feedback signals is enabled to the hybrid. The hybrid will not use it though.
Nov 4 1997 04:52:26:090PM	971104030	Robert Granetz	Shot 30 -- Plasma. Ramps halfway down before it disrupts at t=1.46 s. Prf=1.3-1.6 MW for 0.3 s. Very ELMy. Next shot: Turn on hybrid usage of the RF position feedback signal.
Nov 4 1997 05:05:14:020PM	971104031	Robert Granetz	Shot 31 -- Plasma. Disrupted at 0.86 s, perhaps due to the RF position feedback control signal. I_halo_L=126 kA.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:31:48:940AM	Test	Ok
2	09:04:26:830AM	Test	Bad
3	09:26:22:780AM	Test	Ok
4	09:40:07:570AM	Plasma	Ok
5	09:56:44:290AM	Plasma	Ok
6	10:05:34:360AM	Plasma	Ok
7	10:15:19:500AM	Plasma	Ok	oh2l comm fault
8	11:08:56:540AM	Plasma	Ok	pulse gas Kside test
9	11:19:42:990AM	Test	Ok	pulse gas kport side test
10	11:29:18:060AM	Test	Ok
11	11:56:57:330AM	Plasma	Ok
12	12:12:48:190PM	Plasma	Ok
13	12:35:47:350PM	Plasma	Ok
14	12:47:13:270PM	Plasma	Ok
15	12:55:03:770PM	Plasma	Ok
16	01:06:54:880PM	Plasma	Ok
17	01:15:14:700PM	Plasma	Ok
18	01:26:46:920PM	Plasma	Ok
19	01:38:48:190PM	Plasma	Ok
20	01:52:18:060PM	Plasma	Ok
21	02:30:25:760PM	Plasma	Ok
22	02:42:34:680PM	Plasma	Ok
23	02:55:27:430PM	Plasma	Ok
24	03:23:49:050PM	Test	Ok
25	03:38:36:230PM	Test	Ok
26	03:48:17:360PM	Plasma	Ok
27	03:59:44:410PM	Plasma	Ok
28	04:10:39:200PM	Plasma	Ok
29	04:24:09:780PM	Plasma	Ok
30	04:38:15:210PM	Plasma	Ok
31	04:54:08:600PM	Plasma	Ok