Miniproposals

Miniproposal: 051 Date Filed: 4/8/1994 Title: Constant Shots for Measuring the Emission Profiles of Molybdenum Ionization First Author: Jim Terry Session Leader: Jim Terry (shots 1-28)

Miniproposal: 054 Date Filed: 4/5/1994 Title: ICRF Antenna Conditioning (PRF> 100kW) First Author: Yuichi Takase Session Leader: Yuichi Takase (shots 1-28)

Engineering Operator Run Comment

icrf conditioning

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:10:587PM

Author: To Be Determined

Run Summary for 940601 SL: Takase/Terry PO: Wolfe EO: Daigle/Bertolino MP054 RF Conditioning MP051 Moly profiles Summary for MP054 (RF Conditioning) This was a successful run with only 1 dud and 1 fizzle. Plasma from 940527018 was loaded with some modifications. EF1 current was programmed more positive to prevent diverting near the end of the shot, and a 1 cm inward shift was taken out. The plasma was stable and reproducible, as requested by the authors of MP051 (Moly profiles). We have achieved an injected power of 1.8MW (shot 020 and thereafter, with varying amounts of interrupts). The injected power is currently limited by the available power from the transmitter. Further transmitter tuning (into the dummy load) is required to increase the power beyond this point. Substantial heating was observed, roughly consistent with L-mode scaling. H puff (minority ion) was added starting from shot 018. The concentration, as measured by OMA, was about 15%. The last shot (028) was a "no RF" baseline shot.

Physics Operator Summaries

Entered: Jul 7 2004 04:36:51:647PM

Author: To Be Determined

Physics Operator Summary of run of 940601 This was an RF conditioning run (MP054) with a piggyback moly transport scan (MP051) SL: Takase PO: Wolfe EO: Bertolino/Daigle A good run from the operations point of view. We got a long string of non-disruptive, reasonably reproducible shots. Equilibria were inner wall limited, with elongations between 1.4 and 1.5. Some tweaking was required to keep the density from changing. All shots after #1 had RF assist at breakdown. RF got up to 1.8MW. The Moly people got in a good scan. Tom Luke established a range for the amplitude of his "perturbing" gas puff. Catherine saw lots of neutrons. We started from a reload of 940527018. The first shot was a dud. For the second shot, the Br_0 offset was adjusted more positive by 1mTesla. This resulted in a fizzle. Shot #3, with no changes, was a dirty disruptive shot that terminated at 600msec. Shot #4 dropped the pressure to 1.0e-5 with no other changes. This ran full length (no disruptions) and looked good. The RF power was 700kW. On shot #5, we extended the flattop of the current to 0.8sec; also, the gain switches on the IP controller were moved from 0.6 to 0.8sec. Shot lasted until 1.2 sec with no disruptions. RF power to 1MW. SHot#6: Reduced the elongation by putting a ramp on the IC_EF1U&L currents to +1900 amps at 1.2 sec. This was successful. Shot#7 and 8 were basically the same, except for changes to the Ar pulse. The density dropped on #8 Shot #9 disrupted on ramp down (870msec). The density was substantially lower. Shot #10 raised gas puff. This was successful, got back a full length shot. Shot #11,12 were basically the same, with minor gas tweaks. Shot #13: took out the inward step in RCUR at 500msec in order to keep the outer gap small. This worked, the plasma got fatter, did not move off the inner wall. Shot #14,15: no changes. Shot#16,17: Started trying to put a 20msec gas pulse in at the end for Tom Luke. Couldn't see it. Other than that shot was good. Shot #18: added an H2 pulse on Pulse gas 2, 100V by 30msec. This put in a lot of H2. The shot ran fine, though. Shot #19-21: More tweaking on Ar pulse and Luke's D2 pulse. Reduced H2 pulse width to 10 msec. Shot#22: Disrupted late in ramp-down (1.015 sec). Density went up starting at 0.9sec, maybe a sharkfin? Shot #23: Dropped PULSE GAS#3, removed Luke's pulse. Shot ran normally. Shot#24-27: Adjustments to density level and more amplitude on Luke's pulse. H2 pulse width reduced to 5msec, after an estimate of H/D of 15%. Definitely looks like the late puff is visible on #27 on the Halpha, but not much on the density. This was up to 60V. Shot#28: No RF. Luke's pulse increased from 60V to 85V. This was clearly visible, giving an NL_05 increase of 8e18. Scorecard: ---------- Duds 1 Fizzles 1 Plasmas 26 (24 non-disruptive until >1 sec) ------- -- Total 28

Session Leader Comments
Jun 1 1994 08:55:56:780AM	940601001	Yuichi Takase	M054 RF Conditioning M051 Moly profiles Starting early. No RF on the first shot. Dud.
Jun 1 1994 09:04:47:300AM	940601002	Yuichi Takase	RF on. Fizzle.
Jun 1 1994 09:15:57:830AM	940601003	Yuichi Takase	Plasma, disrupted at 0.59sec. 200kW RF.
Jun 1 1994 09:33:05:350AM	940601004	Yuichi Takase	Full length plasma. 700kW RF. Mo injection from next shot.
Jun 1 1994 09:55:05:550AM	940601005	Yuichi Takase	Full length plasma. Extended Ip flattop to 0.8sec. 1MW RF.
Jun 1 1994 10:29:25:610AM	940601006	Yuichi Takase	Full length plasma. 1MW RF.
Jun 1 1994 10:29:48:930AM	940601007	Yuichi Takase	Full length plasma. 1.3MW RF.
Jun 1 1994 10:59:23:810AM	940601008	Yuichi Takase	Full length plasma. About 1.3MW RF. Not a very nice looking plasma.
Jun 1 1994 11:17:49:100AM	940601009	Yuichi Takase	Disrupted at the end. About 1.3MW RF.
Jun 1 1994 11:58:28:680AM	940601010	Yuichi Takase	Cleaner shot, 1.2MW.
Jun 1 1994 12:00:37:850PM	940601011	Yuichi Takase	1.5MW, transmitter crowbarred. A little higher density.
Jun 1 1994 12:24:12:130PM	940601012	Yuichi Takase	1.3MW, transmitter crowbarred. Take out the inward position shift for the next shot.
Jun 1 1994 12:38:16:620PM	940601013	Yuichi Takase	1.4MW. Better loading (took out the inward position shift).
Jun 1 1994 01:10:16:250PM	940601014	Yuichi Takase	1.4MW. Trying to get better tuning.
Jun 1 1994 01:10:32:750PM	940601015	Yuichi Takase	1.4MW. Still trying to get better tuning.
Jun 1 1994 01:34:51:020PM	940601016	Yuichi Takase	1.5MW. Tuning improving.
Jun 1 1994 01:58:21:840PM	940601017	Yuichi Takase	1.55MW. Tuning improving. H puff from the next shot (100V X 30msec).
Jun 1 1994 02:16:15:060PM	940601018	Yuichi Takase	1.6MW. Tuning improving. Large density rise from the H puff (100V X 30msec). Reduce it to 100V X 10msec for the next shot.
Jun 1 1994 02:24:51:300PM	940601019	Yuichi Takase	1.6MW. H puff looks OK.
Jun 1 1994 02:46:11:080PM	940601020	Yuichi Takase	1.8MW. Tuning better.
Jun 1 1994 03:23:11:740PM	940601021	Yuichi Takase	1.8MW. Moved the stub.
Jun 1 1994 03:23:25:410PM	940601022	Yuichi Takase	1.8MW. Moved the stub again.
Jun 1 1994 03:54:01:230PM	940601023	Yuichi Takase	1.8MW, interrupts.
Jun 1 1994 03:55:02:800PM	940601024	Yuichi Takase	1.8MW, interrupts. H/D ratio 15% from OMA. H puff 100V X 5msec for the next shot.
Jun 1 1994 04:13:21:020PM	940601025	Yuichi Takase	1.8MW, interrupts. Lowering the RF program voltage. Try to lower density on the next shot.
Jun 1 1994 04:28:52:580PM	940601026	Yuichi Takase	1.7MW, interrupts. Lowering the RF program voltage. Bright spots on the antenna.
Jun 1 1994 04:49:10:120PM	940601027	Yuichi Takase	1.8MW, interrupts.
Jun 1 1994 05:01:19:170PM	940601028	Yuichi Takase	No RF (baseline shot).

Physics Operator Comments
Jun 1 1994 08:30:41:500AM		Steve Wolfe	Load from 940527018, an 800kA full length shot from last Friday. The OH2 supplies are left as at the end of yesterday, namely Integral gains at 300 ohm each, proportional at 50 ohms? Previously the integral gains were unbalanced. Note that the gain switch on IP controller on OH2's and EFF1's is at 600 msec, while the EOF is at 720msec.
Jun 1 1994 08:49:24:260AM	940601001	Steve Wolfe	Shot #940601001 ----------------- First shot at 08:45 P0 = 1.1e-5 Result: ------- Dud. Null looks horrible. Radial field looks too negative
Jun 1 1994 09:04:04:350AM	940601002	Steve Wolfe	Shot #940601002 ----------------- Raise Br0 from -3.5e-3 to -2.5e-3 Raise P to 1.2e-5 Result: ------- Fizzle Early breakdown : 5.3msec
Jun 1 1994 09:18:23:050AM	940601003	Steve Wolfe	Shot #940601003 ----------------- No change Result: ------- Plasma. lasts till 600 msec. Disrupts down. Lots of vertical instability oscillations. The null looks terrible. This shot had trouble all the way through; dirty and disruptive. Current is well behind the track until 500msec. Shape is bad as a result?
Jun 1 1994 09:33:06:980AM	940601004	Steve Wolfe	Shot #940601004 ----------------- Drop fill to 1.0e-5 and try that again. Result: ------- Much better. Full length.
Jun 1 1994 09:44:58:980AM	940601005	Steve Wolfe	Shot #940601005 ----------------- Extend flattop to 0.8 sec, and gain switches on controllers the same. Result: ------- good long shot lasts till 1.2 sec
Jun 1 1994 10:11:16:930AM	940601006	Steve Wolfe	Shot #940601006 ----------------- Turn on Argon at 0.8 sec, 3 psi on plenum. Bring IC_EF1U&L ramping to 1900 A at 1.2sec Result: ------- Another good one. EF1 changed more or less aas expected.
Jun 1 1994 10:25:20:060AM	940601007	Steve Wolfe	Shot #940601007 ----------------- MOve Ar pulse to 0.3 sec Otherwise the same. Result: ------- Looks good. Yuichi reports record power = 1.3MW
Jun 1 1994 11:00:19:970AM	940601008	Steve Wolfe	Shot #940601008 ----------------- No change Result: ------- Good shot, but lower density?? Breakdown a little early, but no particular problem in current rise.
Jun 1 1994 11:15:20:400AM	940601009	Steve Wolfe	Shot #940601009 ----------------- No change Result: ------- Disrupted late at 870 msec. Went down Density lower again.
Jun 1 1994 11:34:57:670AM	940601010	Steve Wolfe	Shot #940601010 ----------------- Raise gas puff to 40V from .4 sec on Result: ------- Density is a little over 8e19 (NL_05) Loading a bit lower.
Jun 1 1994 11:47:50:820AM	940601011	Steve Wolfe	Shot #940601011 ----------------- Drop pulse gas from 40V to 38V after 500msec Result: ------- RF gets to higher power (1.5MW) but trips out around 0.66sec Yuichi wants higher loading. Density actually went up this time.
Jun 1 1994 12:14:57:490PM	940601012	Steve Wolfe	Shot #940601012 ----------------- Drop pulse gas to 35V after 400msec Result: ------- Good shot. Rf a little lower power. Yuichi still looking for more loading.
Jun 1 1994 12:31:26:270PM	940601013	Steve Wolfe	Shot #940601013 ----------------- Take out step in in RCUR at 500msec (.67 for whole shot) Result: ------- RF lasted longer, and Mike claims they got higher power. Looks like it did it ok Still inner wall limited, it just moved the outside out a bit.
Jun 1 1994 12:51:02:550PM	940601014	Steve Wolfe	Shot #940601014 ----------------- No changes Result: ------- RF faulted earlier. Shot ran full length.
Jun 1 1994 01:01:37:750PM	940601015	Steve Wolfe	Shot #940601015 ----------------- No changes Result: ------- Similar
Jun 1 1994 01:33:10:610PM	940601016	Steve Wolfe	Shot #940601016 ----------------- Add a 5V increment to the gas puff between 780 and 800msec for T. Luke Result: ------- Good shot Can't see Tom's gas pulse.
Jun 1 1994 01:53:33:750PM	940601017	Steve Wolfe	Shot #940601017 ----------------- Add a 10V increment to the gas puff between 780 and 800msec for T. Luke Increase width of Ar puse by 4msec. Result: ------- Good shot I think Tom's pulse is visible.
Jun 1 1994 02:05:37:450PM	940601018	Steve Wolfe	Shot #940601018 ----------------- Leave 10V increment to the gas puff between 780 and 800msec for T. Luke PUt a H2 pulse in at 100V from 310 to 340msec Result: ------- Got way too much H2, but it ran
Jun 1 1994 02:25:33:070PM	940601019	Steve Wolfe	Shot #940601019 ----------------- Leave 10V increment to the gas puff between 780 and 800msec for T. Luke Reduce H2 pulse to 10msec, at 100V from 310 to 320msec INcrease Ar puff width by 1msec Result: ------- That looks much better on the Halpha.
Jun 1 1994 02:41:39:100PM	940601020	Steve Wolfe	Shot #940601020 ----------------- INcrease increment to the gas puff between 780 and 800msec for T. Luke to 15V Also increase width of Ar pulse by another msec Result: ------- Good shot, went full length. OH1 faulted at 1.2sec Rf lasted longer, got higher power: 1.8MW Big moly injection (laser blowoff) at 400msec Higher density. Luke's pulse still not obvious.
Jun 1 1994 03:18:02:710PM	940601022	Steve Wolfe	Shot #940601022 ----------------- INcrease Luke's pulse by 10 more Volts (to 25V) Result: ------- OH1 faulted at 1.2sec, Plasma lasted until 1.015 ; current rampdown was faster. Density ramps up at 900msec, after gas pulse.
Jun 1 1994 03:28:56:470PM	940601023	Steve Wolfe	Shot #940601023 ----------------- Remove Luke's pulse, drop Pulse gas 3 by 2:3 Volts after 400msec Result: ------- PF pulled out again at aboult the same time. Shot went full length. NL_05 is still around 8.8e19 RF to 1.8MW, but faulting repeatedly.
Jun 1 1994 03:47:42:150PM	940601024	Steve Wolfe	Shot #940601024 ----------------- Lower pulse gas to 30V, put back a 10V pulse for luke at 780 to 800msec Result: ------- Good shot, density only slightly lower.
Jun 1 1994 04:07:59:670PM	940601025	Steve Wolfe	Shot #940601025 ----------------- Cut width of H2 pulse to 5msec Luke pulse to 15V between 780 and 800 msec Result: ------- Shot looks good. Density still a bit high. No sign of Luke's pulse.
Jun 1 1994 04:28:12:050PM	940601026	Steve Wolfe	Shot #940601026 ----------------- Drop pulse gas 3 to 25V after 400msec, raise Luke's pulse to 50V Result: ------- Density slightly lower. Still no sign of Luke's pulse.
Jun 1 1994 04:45:17:920PM	940601027	Steve Wolfe	Shot #940601027 ----------------- raise Luke's pulse to 60V Result: ------- Similar. I see it on Halpha but not on NL_05
Jun 1 1994 05:00:26:770PM	940601028	Steve Wolfe	Shot #940601028 ----------------- raise Luke's pulse to 85V No RF on this shot. Result: ------- This time we get a rise of 8e18 on NL_05. Density is generally lower without the RF by about 1e19

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:43:34:090AM	Plasma	Ok	no faults
2	08:54:51:330AM	Plasma	Ok	no faults
3	09:06:24:670AM	Plasma	Ok	no faults
4	09:23:00:070AM	Plasma	Ok	no faults
5	09:39:47:090AM	Plasma	Ok	no faults
6	10:03:27:690AM	Plasma	Ok	no faults
7	10:19:22:120AM	Plasma	Ok	no faults
8	10:41:23:810AM	Plasma	Ok	no faults
9	11:04:40:810AM	Plasma	Ok	no faults
10	11:23:34:850AM	Plasma	Ok	no faults
11	11:39:48:910AM	Plasma	Ok	no faults
12	12:00:32:400PM	Plasma	Ok	no faults
13	12:22:48:480PM	Plasma	Ok	no faults
14	12:41:16:080PM	Plasma	Ok	No faults.
15	12:58:45:180PM	Plasma	Ok	No faults
16	01:21:10:810PM	Plasma	Ok	No Faults
17	01:41:40:600PM	Plasma	Ok	No faults
18	01:58:01:500PM	Plasma	Ok	No Faults
19	02:14:55:760PM	Plasma	Ok	No faults
20	02:32:34:680PM	Plasma	Ok	OH1 comm. fail good shot
21	02:50:21:570PM	Plasma	Ok	No faults
22	03:05:39:970PM	Plasma	Ok	OH1 COMM Fault not real noisepick up.
23	03:22:24:340PM	Plasma	Ok	OH1 comm fail disconnected B phase conn fail bd.
24	03:42:13:070PM	Plasma	Ok	No Faults
25	04:00:35:730PM	Plasma	Ok	No faults
26	04:19:51:850PM	Plasma	Ok	NO faults
27	04:35:08:610PM	Plasma	Ok	NO faults
28	04:53:04:100PM	Plasma	Ok	No faults