Miniproposals

Miniproposal: 208 Date Filed: 1/4/1999 Title: Burping Probe and Plume Imaging Systems Commissioning First Author: Brian Labombard Session Leader: Brian Labombard (shots 1-25)

Engineering Operator Run Comment

MP 208

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:18:960PM

Author: To Be Determined

Session Leader's summary of run 990210 MP#208 - Burping Probe and Plume Imaging Systems Commissioning Physics Operator: Marmar Session Leader: LaBombard The goal of this run was to calibrate and test the fast-scanning burping probe and the video systems used to view the resultant impurity injection plumes. The video equipment was not ready for this run so we focussed on calibrating and testing the fast-scanning burping probe. A series of test shots were taken just before the run, injecting various amounts of ethylene (C2H4) and freon (CCl2F2) into the torus chamber. Also a test shot of freon injection was taken between shot 10 and 11 during the run and two test shots were taken after the run. The following tests shots are stored in the edge tree: Ethylene tests: (per injection) Shot ~Molecules plenum pressure trigger duration injections 6073 2x10^16 (C2H4) 11.8 torr -1.5 1.5 0.5,.8,1.1 6074 2x10^16 (C2H4) 14.7 torr -1.0 1.25 0.5,.8,1.1 6075 8x10^16 (C2H4) 20.5 torr -.75 1.1 0.5,.8,1.1 6076 1.9x10^17 (C2H4) 31.3 torr -0.5 0.75 0.5,.8,1.1 6077 4x10^17 (C2H4) 51.6 torr -.25 0.5 0.5,.8,1.1 6078 7x10^17 (C2H4) 79.1 torr 0.0 0.5 0.5,.8,1.1 Freon tests: *Note - pressure (->molecules) is in D2 equivalent. The ionization gauge sensitivity for freon needs to be measured. (per injection) Shot ~Molecules plenum pressure trigger duration injections 6079 1x10^16 (*) 6.9 torr -1.5 1.5 0.5,.8,1.1 6080 3x10^16 (*) 6.9 torr -2.0 1.5 0.5,.8,1.1 6081 1.5x10^17 (*) 9.9 torr -2.0 1.5 0.5,.8,1.1 6082 3.5x10^17 (*) 15.2 torr -1.5 1.25 0.5,.8,1.1 6083 4.5x10^17 (*) 15.1 torr -1.5 1.25 0.5 6084 7x10^17 (*) 23.3 torr -1.0 1.0 0.5,.8,1.1 6085 1.7x10^18 (*) 35.7 torr -0.75 1.0 0.5,.8,1.1 This test shot was done during the run: 6086 1.4x10^18 (*) 34.5 torr -0.75 1.0 0.5,.8 This test shot was done after the run: 6087 1.9x10^18 (*) 45.1 torr -0.3 0.7 0.5,.8 This test shot was done after the run: 6088 1.9x10^18 (*) 44.3 torr -0.3 0.7 0.5,.9 Plasma Tests: The first plasma was good despite the extensive injections of ethylene and freon just prior to it. All shots, with the exception of shots 23 and 24, where nominally NL04=1x10^20, 0.8 MA discharges. Some RF conditioning was done from 1 to 1.2 sec. The first 7 shots were used to condition the probe head. By shot 7, arcing on the probe head (detected by the current collection) was reduced and it was decided to start gas injections. Since we did not have the camera system to look at carbon plumes, we did not inject any ethylene. Instead, we focussed on optimizing freon injections so that HIREX and VUV spectrometers could detect it. To our surprize, we needed to inject quite a large amount of freon in order to see anything on the spectrometers. The magnitude of the freon puff was successively increased on shots 8-12. The best gas-puff setup was obtained by shot 14. On first look, the results are a bit puzzling: No difference in Cl screening for different injection depths...The data from discharges 14 on need to be looked at in detail. 990210008: 7.3 torr setup, 2mm outside LCFS - no effect 990210009: 15.6 torr setup, 2mm outside LCFS - no effect 990210010: no injection -> did a test freon injection between shots (edge 6086) 990210011: 34.5 torr setup, 2 mm outside LCFS - small injection seen on 2pi, edge x-ray array, HIREX (He-like Cl) and VUV (Li-like F) 990210012: 71.8 torr setup, 2 mm outside LCFS - big perturbations: See effect on NL04, HIREX, VUV, edge x-ray, central X_ray, central ECE, G-side ratiomatic 990210013: 48 torr setup, 2 mm outside LCFS - good signals on HIREX, VUV. Start of injection depth scans with fixed freon puff and fixed plasma: Best setup: 48 torr setup with reduce pulse length (-0.3 trig, 0.7 duration) 990210014: 3, 5 mm outside LCFS 990210015: 17, 22 mm outside LCFS 990210017: > 30 mm outside LCFS 990210018: 3, 6 mm outside LCFS 990210019: 0, 0 mm outside LCFS 990210020: 17, 18 mm outside LCFS 990210021: 3, 1 mm INSIDE LCFS 990210022: 17, 18 mm outside LCFS Attempt at higher density: 990210024: 17, 24 mm outside LCFS

Physics Operator Summaries

Entered: Jul 7 2004 04:37:00:037PM

Author: To Be Determined

#46 of 49 OPS Date: 10-FEB-1999 19:14 Expires: 24-FEB-1999 00:00 From: SPANNA::MARMAR Subj: Physop run summary 990210 Physop summary 990210 EO Silva/DeKow SL LaBombard PO Marmar/Mossessian Miniproposal 208: Burping Probe and Plume Imaging Systems Commissioning The goals of today's run are to calibrate and test the fast-scanning burping probe. The run plan: 1) Calibrate gas puffs of ethylene and freon into vacuum, using the FSP NINJA system to puff through the puffer probe. This will start early (around 7:30 am) and can be done without running shot cycles. We will puff controlled amounts of ethylene and freon gas into the vacuum chamber to correlate quantity injected with plenum fill pressures. Also the valve timing needs to be optimized for these gases. 2) The plasma experiments require 2 different discharges to be programmed and repeated as needed. Both discharges will be diverted, ohmic 0.8 MA plasma. Discharge (A) - Low to medium recycling divertor discharge Flat-top density with NL04 less than 1.0x10^20 m^-2 Discharge (B) - Medium recycling to high recycling to detached divertor discharge Flat-top density with NL04 greater than 1.2x10^20 m-2 The shot sequence will be determined as the run progresses. We will vary the amount of gas injected and the insertion depth of the scanning probe. In the case of freon injection, Cl concentrations in the core will be monitored with HIREX. Part 1 was successfully completed, and first plasma was obtained before 10:00 am. Brian puffed freon into many discharges; measurements of fluorine were made with the McPherson and measurements of chlorine were made with HIREX. The startup continued to be very reliable, with current rise obtained on all 23 attempts that had all power supplies working. 2 of those shots disrupted before the probe insertion times. The rest made it to or beyond rampdown. The only change to the startup programming was made before shot 23; it was a 1 mT tweak to the BR_0 offset. The RF, which was piggybacking, got up to 3 MW injected (shot 24); heating was clear; stored energy increases were roughly consistent with L-Mode. There were some hints of dithers on a few shots (20,22,24). H/D ratios were the lowest of the campaign so far, typically in the range from 0.05 to 0.25; on shot 24, the ratio peaked during the RF at about 0.18. The machine ran reliably at nl_04=1e20. Attempts to raise the density to 1.2e20 were met with some resistance by the plasma. Shot 23 disrupted early because of overly aggressive deuterium gas puffing between 0.1 and 0.3 seconds. There was much tweaking to the rampdown; shot 18 made it to 200 kA before the major disruption, although it exhibited minor disruptions on the way down. Most of the rampdowns were done with the plasma remaining diverted. After raising the density to 1.2e20, the plasmas disrupted at 500 kA in rampdown. Engineering systems: 2 shots were lost to power supply problems. There was no TF on shot 16. There was no EF4 on shot 25. Summary: 23 plasmas 2 duds ---------- 25 cycles

Session Leader Comments
Feb 10 1999 09:58:08:077AM	990210001	Brian Labombard	First plasma - very good despite extensive injections of C2H4 and CCl2F2 through the burping probe before the run. Scanning probe firing in silo.
Feb 10 1999 10:16:20:200AM	990210002	Brian Labombard	Scanning probe firing. Peak insertion at 0.5 and 0.8 sec. Rest position -20 mm. 15 mm outside LCFS. No impurity puffing.
Feb 10 1999 10:54:13:500AM	990210004	Brian Labombard	Some arcing on the probe was seen on shot#2. Scanning probe firing again on this shot. Peak insertion at 0.5 and 0.8 sec. Rest position -20 mm. 15 mm outside LCFS. No impurity puffing. -> Still see some arcing on the probe.
Feb 10 1999 11:12:41:467AM	990210005	Brian Labombard	Scanning probe firing again on this shot. Peak insertion at 0.5 and 0.8 sec. Rest position -1 5mm. 10 mm outside LCFS. No impurity puffing. -> Still see some arcing on the probe.
Feb 10 1999 11:28:45:280AM	990210006	Brian Labombard	Scanning probe firing again on this shot. Peak insertion at 0.5 and 0.8 sec. Rest position -10 mm. 7 mm outside LCFS. No impurity puffing. -> Arcing looks better. Try another shot.
Feb 10 1999 11:49:26:280AM	990210007	Brian Labombard	Scanning probe firing again on this shot. Peak insertion at 0.5 and 0.8 sec. Rest position -50 mm. 2 mm outside LCFS. No impurity puffing. -> Some arcing, looks better.
Feb 10 1999 11:59:01:250AM	990210008	Brian Labombard	Scanning probe firing again on this shot. CCl2F2 injection NINJA setup: 7.3 torr, trig: -1.5, duration 1.5 Insertion/injection at 0.5 and 0.8 sec. FSP Rest position -5 mm. 2 mm outside LCFS. Does not affect plasma. Try more pressure.
Feb 10 1999 12:30:01:107PM	990210009	Brian Labombard	Scanning probe firing again on this shot. CCl2F2 injection NINJA setup: 15.6 torr, trig: -1.5, duration 1.25 Insertion/injection at 0.5 and 0.8 sec. FSP Rest position -5 mm. 2 mm outside LCFS. No clear evidence of injection. -> need more gas.
Feb 10 1999 12:34:11:780PM	990210010	Brian Labombard	Scanning probe firing again on this shot. No injection FSP Rest position -5 mm. 2 mm outside LCFS.
Feb 10 1999 01:00:45:513PM	990210011	Brian Labombard	Tested CCl2F2 injection (this setup) between shot 10 and 11. See edge test shot#6086. Scanning probe firing again on this shot. CCl2F2 injection NINJA setup: 34.5 torr, trig: -0.75, duration 1.0 Insertion/injection at 0.5 and 0.8 sec. FSP Rest position -5 mm. 2 mm outside LCFS. Small injection see on 2pi, edge x-ray, HIREX, VUV Nesxt shot -> double freon pressure.
Feb 10 1999 01:18:01:937PM	990210012	Brian Labombard	Scanning probe firing again on this shot. CCl2F2 injection NINJA setup: 71.8 torr, trig: -0.5, duration 1.0 Insertion/injection at 0.5 and 0.8 sec. FSP Rest position -5 mm. 2 mm outside LCFS 0.3 torr rise on differential gauge Big perturbation. See on NL04, HIREX, VUV, edge X-ray, central X-ray, central ECE. G-side ratiomatic. Backing off to 50 torr fill pressure.
Feb 10 1999 01:36:56:140PM	990210013	Brian Labombard	Scanning probe firing again on this shot. CCl2F2 injection NINJA setup: 48 torr, trig: -0.5, duration 1.0 Insertion/injection at 0.5 and 0.8 sec. FSP Rest position -5 mm. 2 mm outside LCFS 0.2 torr rise on differential gauge Good signals. Try reducing pulse length.
Feb 10 1999 01:53:49:403PM	990210014	Brian Labombard	Scanning probe firing again on this shot. CCl2F2 injection NINJA setup: 48 torr, trig: -0.3, duration 0.7 Insertion/injection at 0.5 and 0.8 sec. FSP Rest position -5 mm. 2 mm outside LCFS 0.3 torr rise on differential gauge Next shot -> move probe out by 15 mm
Feb 10 1999 02:26:00:653PM	990210015	Brian Labombard	Scanning probe firing again on this shot. CCl2F2 injection NINJA setup: 47.2 torr, trig: -0.3, duration 0.7 Insertion/injection at 0.5 and 0.8 sec. FSP Rest position -20 mm. 17 mm outside LCFS 0.3 torr rise on differential gauge Next shot -> move probe out another 10 mm
Feb 10 1999 02:27:24:013PM	990210016	Brian Labombard	Scanning probe firing again on this shot. CCl2F2 injection NINJA setup: 47.2 torr, trig: -0.3, duration 0.7 Insertion/injection at 0.5 and 0.8 sec. FSP Rest position -30 mm 0.3 torr rise on differential gauge Power supply fault.
Feb 10 1999 02:42:46:357PM	990210017	Brian Labombard	Scanning probe firing again on this shot. CCl2F2 injection NINJA setup: 46.9 torr, trig: -0.3, duration 0.7 Insertion/injection at 0.5 and 0.8 sec. FSP Rest position -30 mm 0.3 torr rise on differential gauge Next shot back to -5 mm rest position.
Feb 10 1999 02:59:35:950PM	990210018	Brian Labombard	Scanning probe firing again on this shot. CCl2F2 injection NINJA setup: 46.7 torr, trig: -0.3, duration 0.7 Insertion/injection at 0.5 and 0.8 sec. FSP Rest position -5 mm 0.3 torr rise on differential gauge Next shot go to 0 mm.
Feb 10 1999 03:16:18:750PM	990210019	Brian Labombard	Scanning probe firing again on this shot. CCl2F2 injection NINJA setup: 46.4 torr, trig: -0.3, duration 0.7 Insertion/injection at 0.5 and 0.8 sec. FSP Rest position 0 mm 0.3 torr rise on differential gauge Next shot go to -20 mm
Feb 10 1999 03:34:09:590PM	990210020	Brian Labombard	Scanning probe firing again on this shot. CCl2F2 injection NINJA setup: 46.1 torr, trig: -0.3, duration 0.7 Insertion/injection at 0.5 and 0.8 sec. FSP Rest position -20 mm 0.3 torr rise on differential gauge Next shot go to 0 mm
Feb 10 1999 03:53:18:280PM	990210021	Brian Labombard	Scanning probe firing again on this shot. CCl2F2 injection NINJA setup: 45.9 torr, trig: -0.3, duration 0.7 Insertion/injection at 0.5 and 0.8 sec. FSP Rest position 0 mm 0.3 torr rise on differential gauge Next shot go to NL04=1.2 and -20 mm probe position
Feb 10 1999 04:09:33:357PM	990210022	Brian Labombard	Scanning probe firing again on this shot. CCl2F2 injection NINJA setup: 45.6 torr, trig: -0.3, duration 0.7 Insertion/injection at 0.5 and 0.8 sec. FSP Rest position 20 mm 0.3 torr rise on differential gauge Repeat shot. Move to 0 mm.
Feb 10 1999 04:28:29:170PM	990210023	Brian Labombard	Disrupted before first probe scan. Move probe to -20 mm position. Change insertion timing to 0.5, 0.9 sec. Try again.
Feb 10 1999 04:46:06:250PM	990210024	Brian Labombard	Scanning probe firing again on this shot. CCl2F2 injection NINJA setup: 44.9 torr, trig: -0.3, duration 0.7 Note FSP timing is changed: Insertion/injection at 0.5 and 0.9 sec. FSP Rest position -20 mm 0.3 torr rise on differential gauge Repeat shot. Move to 0 mm. [End of file]

Physics Operator Comments
Feb 10 1999 08:44:19:310AM		Earl Marmar	hybrid coldstart; all matrices respond; no errors
Feb 10 1999 09:56:37:060AM	990210001	Earl Marmar	reload 990209019; tweak the late gas pulse; no helium puff; no probe puff on this shot plasma; good shot
Feb 10 1999 10:20:06:780AM	990210002	Earl Marmar	move TF ramp down to start at 1.2 s; tweak RCUR ramp-in to be more gentle Brian will insert the scanning probe on this one, at 0.5 and 0.8 s; no puffs plasma; lasted about 30 ms longer into rampdowm probe was inserted
Feb 10 1999 10:46:57:780AM	990210003	Earl Marmar	tweak RCUR in rampdown early disrupt; 600 kA strange early vertical position oscillations; no obvious power supply or hybrid problems.
Feb 10 1999 11:00:45:140AM	990210004	Earl Marmar	reload shot 2 from today; tweak late RCUR plasma; good shot
Feb 10 1999 11:15:34:043AM	990210005	Earl Marmar	RXL, ZXL tweaks in rampdown plasma; slightly earlier disrupt in rampdown
Feb 10 1999 11:28:49:357AM	990210006	Earl Marmar	tweak ZXL and EF2_by_EF4 in rampdown plasma; good shot
Feb 10 1999 11:48:57:983AM	990210007	Earl Marmar	tweak RCUR in rampdown plasma; good shot
Feb 10 1999 12:05:31:250PM	990210008	Earl Marmar	tweak RCUR again Brian will puff a little freon on this one. plasma; good shot no evidence of freon on prad_2pi
Feb 10 1999 12:22:16:233PM	990210009	Earl Marmar	more freon (double the plenum pressure) Tweak RCUR in rampdown plasma; good shot still no evidence of freon
Feb 10 1999 12:48:46:293PM	990210010	Earl Marmar	no PCS changes; no freon plasma; good shot
Feb 10 1999 01:06:14:390PM	990210011	Earl Marmar	More freon; tweak zcur on rampdown plasma; good shot; saw the freon
Feb 10 1999 01:25:22:607PM	990210012	Earl Marmar	no PCS changes more freon plasma; disrupts during RF, just before start of rampdown
Feb 10 1999 01:33:17:327PM	990210013	Earl Marmar	no pcs changes less freon plasma; good shot
Feb 10 1999 02:05:37:577PM	990210014	Earl Marmar	restore zcur programming from shot 4 increase I_p rampdown rate slightly tweak EF4 current in rampdown plasma; good shot
Feb 10 1999 02:06:15:200PM	990210015	Earl Marmar	tweak RCUR on rampdown plasma; good shot
Feb 10 1999 02:29:47:857PM	990210016	Earl Marmar	slowdown I_p rampdown, tweak various other rampdown params PS dud; no toroidal field
Feb 10 1999 02:44:19:687PM	990210017	Earl Marmar	no PCS changes plasma; good shot; disrupts at 600 kA in rampdown
Feb 10 1999 03:01:03:560PM	990210018	Earl Marmar	tweak RCUR during rampdown plasma; good shot; made it to 200 kA in rampdown
Feb 10 1999 03:19:13:750PM	990210019	Earl Marmar	plasma; good shot
Feb 10 1999 03:36:57:890PM	990210020	Earl Marmar	change EF2_by_EF4 prop gain (increase during rampdown) plasma; disrupted slighlty earlier (.3 MA)
Feb 10 1999 03:54:02:373PM	990210021	Earl Marmar	ZXL and CLEARIN tweaks late in rampdown plasma; good shot
Feb 10 1999 04:10:26:107PM	990210022	Earl Marmar	B_R offset increase by 1 mT to .0035 ZCUR tweak at rampdown nl_04 to 1.2e20 plasma; didn't quite get a steady density, and it was a bit low
Feb 10 1999 04:47:39:373PM	990210023	Earl Marmar	add a little extra gas after 50 ms increase PG_3 voltage prog in seg 2 move nl_04 programming to get to 1.2e20 sooner disrupt at .4 seconds various power supply problems, probably as a consequence of the disruption
Feb 10 1999 04:51:15:890PM	990210024	Earl Marmar	less aggressive on the early gas plasma; good shot; gets to 1.2e20 at about 1 second.
Feb 10 1999 05:00:17:560PM	990210025	Earl Marmar	tweak up to early gas (there were a few hards on the previous shot) PS dud. no EF4

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:49:17:170AM	Plasma	Ok	no faults/plasma
2	10:07:10:937AM	Plasma	Ok	no faults/plasma
3	10:22:02:263AM	Plasma	Ok	no faults/plasma
4	10:47:06:390AM	Plasma	Ok	no faults/plasma
5	11:02:45:043AM	Plasma	Ok	no faults/plasma
6	11:20:46:077AM	Plasma	Ok	no faults/plasma
7	11:37:48:403AM	Plasma	Ok	no faults/plasma
8	11:52:59:310AM	Plasma	Ok	no faults/plasma
9	12:11:49:340PM	Plasma	Ok	no faults/plasma
10	12:30:22:590PM	Plasma	Ok	no faults/plasma
11	12:48:13:263PM	Plasma	Ok	no faults/plasma
12	01:06:35:890PM	Plasma	Ok	no faults/plasma
13	01:23:45:733PM	Plasma	Ok	no faults/plasma
14	01:43:22:357PM	Plasma	Ok	No Faults / Plasma
15	01:58:43:623PM	Plasma	Ok	No Faults / plasma
16	02:22:54:530PM	Plasma	Bad	No TF
17	02:35:54:890PM	Plasma	Ok	No Faults / plasma
18	02:50:48:687PM	Plasma	Ok	No Faults / Plasma
19	03:06:52:733PM	Plasma	Ok	No Faults / Plasma
20	03:27:48:750PM	Plasma	Ok	No Faults / plasma
21	03:42:50:250PM	Plasma	Ok	No Faults / Plasma
22	04:00:59:903PM	Plasma	Ok	NO Faults / Plasma
23	04:17:29:310PM	Plasma	Bad	EF4 Overvoltage Fault
24	04:40:42:920PM	Plasma	Ok	No Faults / Plasma
25	04:55:37:763PM	Plasma	Bad	Ef4 No Output