| Miniproposals | ||||||||||||
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| Operators | |
| Session leader(s): | Steve Wukitch,Bill Rowan |
| Physics operator(s): | Ron Parker |
| Engineering operator(s): | Bill Cochran,Gary Dekow |
| Engineering Operator Run Comment |
| MP #268 ICRF Commissioning, MP #266 DNB Testing in H.Wukitch/Rowan/Cochr |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:24:150PM |
| Author: To Be Determined |
| MP 268 -- ICRF Commissioning MP#266 DNB testing in H Session leader: S. Wukitch/B. Rowan Physics operator: R. Parker Engineering operators: G. Dekow/B. Cochran ------------------------------------------------------------------------------- Engineering setup for Wedensday, 1000614: overnight ECDC in D2, stopping 1-2 hours prior to the run. Run begins at 9:00 and ends at 17:00. Power system setup as on 1000613 (yesterday morning). Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED --> **** fill B-side upper with 10 psi of H Hybrid DISABLED *** <-- NOTE fill C-side with 30 psi of D2 Hybrid enabled J-bottom Hybrid DISABLED The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV DNB gate valve should be DISABLED at the start of the run. RF setup: 1. vacuum tune 2. recall tune from 1000516018 for D, J ST1/PS1 ST2/PS2 ST3/PS3 ST4/PS4 602/845 2531/3000 197/112 333/378 3. 400 msec ramp from 1-500 kW ------------------------------------------------------------------------------- Run plan: Test shots after plasma shot with TF and Gas (3 shots max) reload (1000607007) ****pulse length 1 sec ***** (ie. ramp current and field down at .5 sec) First RF plasma shot, load from 1000516018 (1.0 MA, 5.2 T). Perform Power scan for loading studies. [0.001-0.5 kW] Outer gap scan [0.5,1.0,1.5,2,2.5] H concentration scan [gas programming from 980206] Turn run over to DNB at 3 pm ------------------------------------------------------------------------------- 001 plasma - early disruption from the visible camera views D-port was easily visible (multipacting) E-port was faint J-port was faintly visible next shot: repeat 002 fizzle from the visible camera views D-port was faint E-port was faint J-port was faint G_side_ratiomatic measure 1 mtorr conclusion: all the antennas creat a plasma around the current straps @ 1 mtorr next shot: try for RF plasmas 003 plasma good shot nl_01~1 BT=5.2 T right gap 2 cm next shot: repeat with retune on J3 004 plasma good shot nl_01~1 BT=5.2 T right gap 2 cm next shot: increase gap to 2.5 cm 005 plasma good shot nl_01~1 BT=5.2 T right gap ~2.2 cm next shot: increase gap to 2.5 cm 006 plasma good shot nl_01~1 BT=5.2 T right gap ~2.2 cm next shot: decrease gap to 1.5 cm 007 plasma good shot nl_01~1 BT=5.2 T right gap ~1.5 cm next shot: decrease gap to 1.0 cm 008 plasma good shot nl_01~1 BT=5.2 T right gap ~.7 cm next shot: decrease gap to .4 cm 009 plasma good shot nl_01~1 BT=5.2 T right gap ~1 cm next shot: decrease gap to .4 cm 010 plasma good shot nl_01~1 BT=5.2 T right gap ~.4cm J3 failed early next shot: repeat 011 plasma good shot nl_01~1 BT=5.2 T right gap ~.4cm J3 failed early next shot: recall 007 and begin pabs measurements 012 plasma nl_01~1 BT=5.2 T right gap 1.5 J3 failed early 1 MW from D and E-port 0.5 MW from J4 as programmed next shot: repeat with 1.5 MW from each 013 plasma nl_01~1 BT=5.2 T right gap 1.5 1.5 MW from D, E, and J-port D overloaded early - no pabs for D next shot: repeat 014 plasma nl_01~1 BT=5.2 T right gap 1.5 1.5 MW from D, E, and J-port D the driver anode current appears to be still oscillating, next shot: turn over to DNB, reduce pulse length Summary: It appears that all the antennas produce some plasma during RF vacuum test shots with BT and ~mtorr gas pressure levels. The test was complicated by this because the antennas were not well matched. We succeeded in obtaining 1-250 kW power ramps for gaps between 0.4 -2.5 cm. We also obtained good L-mode discharges for comparison of D, E, and J-port. For similar injected RF powers, D and E heating efficiency was 75-80% and J-port was 50-55%. This experiment completed action items 2, 3, 4B, 4D, and 6 from the J-port antenna workshop. |
| Entered: Jul 7 2004 03:49:24:257PM |
| Author: To Be Determined |
| Session Leader Summary for 1000614 MP 266. DNB Conditioning Session Leader: W. Rowan PhysOp: R. Parker The purpose of this part of the run was to look at the effect of the DNB on the H/D ratio when the DNB is generating a H beam. Shot 014 was used as a reference shot. The DNB gate valve was first opened on shot 015 and then opened on all remaining shots in the run. Opening the gate valve affects the prefill, but this has been observed in the past with D beams. Compare shots 014 through 017 to see this clearly. The gate valve was not opened on shot 014. Shot 015 was a fizzle because the prefill pressure was too high, although the operator did make a reduction in the prefill gas puff. Shots 016-020 have an H/D ratio at very early times that is larger than that on the reference shot. This phenomenon is not continued in later shots so it is unlikely that it is due to the beam. It is something to be aware of and to watch for in subsequent runs. The H/D ratio after the beam is injected appears to hover between 0.02 and 0.04. This is the value for the reference shot as well. There does not appear to be a significant affect on this ratio due to the beam. Shot summary 1000614014 Reference shot. Beam gate valve not opened. 1000614015 Fizzle. Beam on from 0.5s to 0.6s 1000614016 1000614017 Fizzle 1000614018 1000614019 1000614020 Beam on from 0.6s to 0.7s 1000614021 Increment in DNB gas feed. Approx 10% increase in pressure. 1000614022 1000614023 |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:11:363PM |
| Author: To Be Determined |
| Run Plan and Engineering Setup for 1000614 MP 268: ICRF Development 9:00-3:00 MP 266: DNB Testing in H 3:00-5:00 Session Leader: S. Wukitch/B. Rowan Physics Operator: R. Parker Engineering Operators: G. Dekow/B. Cochran Engineering Setup: ECDC in D2, stopping 1-2 hours before run. Run begins at 9:00 and ends at 17:00. Power system setup: Same as for 1000613 Set OH1, OH2U and OH2L fizzle delays at 300ms Set TF fizzle delay at 400 ms Gas setup: B-Top 6 psi D2 Hybrid Enabled B-side lower 1 psi Argon Hybrid DISABLED ** B-side upper 10 psi H Hybrid Enabled ** NOTE!! C-side 30 psi D2 Hybrid Enabled J-bottom leave as is Hybrid DISABLED The following Gate Valves should be ENABLED, assuming no vacuum problems: ECE, VUV DNB gate valve should be DISABLED at start of run RF setup: 1. Vacuum tune 2. recall tune from 1000516018 for D,J ST1/PS1 ST2/PS2 ST3/PS3 ST4/PS4 602/845 2531/3000 197/112 333/378 3. 400 msec ramp from 1-500 kW Run Plan: 1. ICRF Development Test shots after plasma shot with TF and Gas (3 shots max) reload 1000607007 ****Pulse length 1 sec**** (ramp current and field down at 0.5 sec) First RF plasma shot, load from 1000516018 (1.0MA, 5.2 T). Perform power scan for loading studies (.001-0.5 kW) Outer gap scan (0.5, 1.0, 1.5, 2.0, 2.5) H concentration scan (gas programming from 980206) 2. DNB testing in H Setup low-to-mid 10^19 m^-3 shot, similar to 1000613008 Continue with this shot for remainder of run for evaluation of DNB penetration. RUN SUMMARY The run started 45 minutes late due to CAMAC hardware problems. The first shot was a short one requested by the ICRF group to test antenna-induced plasma conditions in the neighborhood of the various antennas. The idea was to fire the RF power into a vacuum, but with some residual ionization left from the main discharge. Although programmed to be short, the shot ended with a disruption. Nevertheless, the shot was sufficient for the intended purpose. Probably due to the disruption, or too low fill pressure, the next shot was a fizzle. Beginning with shot 3, more normal shots were produced with the goal of studying the effect of the "right gap" on RF performance. These shots were inside limited to avoid H-mode. The gap was varied from 5 to 25 mm. This was carried out over shots 3-11. Then, in shot 12, a baseline shot was made to prepare for the study of the effect of H concentration on RF performance. However, no H was puffed; instead, the run was turned over on shot 15 to W. Rowan who requested low density shots to measure the penetration of the DNB. The RF group felt that it could get useful H/D data from the H that would be injected by the DNB. In the remaining shots, shots 15-23, low density (~5-6 e19 m-3) discharges were established to check beam penetration. The RF piggy-backed on these shots, but the combination of low density and high RF power caused disruptions late in the discharge. Finally, in shots 22 and 23, the density was raised after the DNB pulse terminated to 1 e20 m-3 and the discharge ran well. Notable was the high RF power (3 MW) injected by J-port. About 3 MW was injected,but the heating, although significant, was clearly not as strong as that produced by 3 MW injected from D and E ports. The machine performed well for this run and most run objectives were reached. There were 20 useful shots, one dud or fizzle and two definite fizzles. The first was probably due to a disruption on the first shot, and the others were due to the upsetting of the initial fill by gas from the DNB. |
| Session Leader Comments | |||
| Jun 14 2000 10:10:18:997AM | 1000614001 | Steve Wukitch | 001 plasma - early disruption from the visible camera views D-port was easily visible (multipacting) E-port was faint J-port was faintly visible next shot: repeat |
| Jun 14 2000 10:18:38:293AM | 1000614002 | Steve Wukitch | 002 fizzle from the visible camera views D-port was faint E-port was faint J-port was faint conclusion: all the antennas creat a plasma around the current straps next shot: try for RF plasmas |
| Jun 14 2000 10:39:06:247AM | 1000614003 | Steve Wukitch | 003 plasma good shot nl_01~1 BT=5.2 T right gap 2 cm next shot: repeat with retune on J3 |
| Jun 14 2000 11:16:05:903AM | 1000614004 | Steve Wukitch | 004 plasma good shot nl_01~1 BT=5.2 T right gap 2 cm next shot: increase gap to 2.5 cm |
| Jun 14 2000 11:42:41:247AM | 1000614006 | Steve Wukitch | 006 plasma good shot nl_01~1 BT=5.2 T right gap ~2.2 cm next shot: decrease gap to 1.5 cm |
| Jun 14 2000 12:09:12:000PM | 1000614007 | Steve Wukitch | 007 plasma good shot nl_01~1 BT=5.2 T right gap ~1.5 cm next shot: decrease gap to 1.0 cm |
| Jun 14 2000 12:47:35:217PM | 1000614008 | Steve Wukitch | 008 plasma good shot nl_01~1 BT=5.2 T right gap ~.7 cm next shot: decrease gap to .4 cm |
| Jun 14 2000 12:48:27:717PM | 1000614009 | Steve Wukitch | 009 plasma good shot nl_01~1 BT=5.2 T right gap ~1 cm next shot: decrease gap to .4 cm |
| Jun 14 2000 12:56:59:763PM | 1000614010 | Steve Wukitch | 010 plasma good shot nl_01~1 BT=5.2 T right gap ~.4cm J3 failed early next shot: repeat |
| Jun 14 2000 01:15:54:467PM | 1000614011 | Steve Wukitch | 011 plasma good shot nl_01~1 BT=5.2 T right gap ~.4cm J3 failed early next shot: recall 007 and begin pabs measurements |
| Jun 14 2000 01:38:13:997PM | 1000614012 | Steve Wukitch | 012 plasma nl_01~1 BT=5.2 T right gap 1.5 J3 failed early 1 MW from D and E-port 0.5 MW from J4 as programmed next shot: repeat with 1.5 MW from each |
| Physics Operator Comments | |||
| Jun 14 2000 12:16:19:873PM | 1000614001 | Ron Parker | Run delayed due to CAMAC hardware failure. First shot off at 9:45 Computer is hanging up intermittently. The first shot went off as planned: a short shot for RF testing purposes. The shot was supposed to ramp down after 0.5 s, but disrupted around that time instead. Disruption was probably due to density demand extending beyond current rampdown. The next shot is scheduled to be a repeat of shot 1, but with density ramped down earlier. |
| Jun 14 2000 10:18:54:920AM | 1000614002 | Ron Parker | This shot was a dud, probably because the initial fill pressure was too low. Also could have failed because the first shot ended in disruption. Cell entry granted after shot. Next shot will be normal 1.0 MA, 5.2 T loaded from 1000516018. |
| Jun 14 2000 10:58:48:920AM | 1000614003 | Ron Parker | Shot 1000516018 was loaded and ran as programmed. Initial current rise hesitates, possibly due to low fill pressure. Next shot will be a repeat of shot 3. Prefill pulse will be increased to 25 msec. |
| Jun 14 2000 11:06:19:827AM | 1000614004 | Ron Parker | Shot 4 was a repeat of shot 3. It ran as programmed, however initial current ramp has a hesitation even though fill pulse was increased to 25 msec. Next shot: increase right gap by 5 mm. |
| Jun 14 2000 11:24:41:610AM | 1000614005 | Ron Parker | Shot 5 ran as programmed, with right gap increased by 5 mm. Next shot will have right gap again increased by 5 mm. Also EF4 current will be increased from 1290 to 1280 to try to correct hesitation in startup. |
| Jun 14 2000 11:49:40:153AM | 1000614006 | Ron Parker | Shot 6 ran as planned with gap increased by ~5 mm. Adding 10 A to EF4 also improved the initial current ramp. The right gap for this shot was 2.5 cm . In the next shot, the right gap will be programmed to be 1.5 cm. Note: The actual gap achieved seems to be about half that programmed -- i.e., about the same as the change in RCUR. In the next shot, RCUR will be increased by 7.5 mm in order to try to bring the right gap to 1.5 cm. |
| Jun 14 2000 12:08:12:717PM | 1000614007 | Ron Parker | Shot 7 ran as programmed, with the right gap at 1.4 cm. Next shot: repeat, with right gap set for ~1.0 cm (RCUR increased by 3.5 mm). |
| Jun 14 2000 12:23:40:653PM | 1000614008 | Ron Parker | Shot ran as programmed, but right gap was ~0.6-0.8 cm, rather than 1.0 cm as expected. Next shot: Take 1.5 mm off RCUR to try to bring right gap to 1 cm. Added 5 A to EF 4 to help startup. |
| Jun 14 2000 12:51:25:030PM | 1000614009 | Ron Parker | Shot 9 ran well, but gap was ~1cm, (as programmed, operator error!) whereas 0.5 cm was requested. Next shot: program 0.5 cm gap. |
| Jun 14 2000 12:58:33:327PM | 1000614010 | Ron Parker | Shot 10 ran as programmed, with right gap ~ 0.5 cm. Next shot: repeat of shot 10. EF 4 current increased again by 5 A. |
| Jun 14 2000 01:28:46:437PM | 1000614011 | Ron Parker | Shot 11 ran as programmed, a repeat of shot 10. Next shot: Return to shot 7 as baseline to begin H concentration scan. |
| Jun 14 2000 01:42:56:937PM | 1000614012 | Ron Parker | Shot 12 ran well, but no RF from No.3. Next shot: Shot 12 will be repeated without change. |
| Jun 14 2000 02:05:53:857PM | 1000614013 | Ron Parker | Shot 13 ran as programmed. Initial current rise was a little too rapid causing a hesitation. For next shot, increase prefill pulse width by 2 ms and bring EF 4 up to -1275 A. Next shot: repeat. |
| Jun 14 2000 02:20:42:860PM | 1000614014 | Ron Parker | This shot ran as programmed, and RF ran well also. Next, W. Rowan becomes session leader and the DNB part of the run plan will be implemented. ICRF will continue with minority concentration studies, using H injected from DNB. For next shot, no change except DNB will be pulsed. Fill pulse reduced by 5 ms in length to accommodate extra gas injected by DNB. |
| Jun 14 2000 02:40:28:700PM | 1000614015 | Ron Parker | This shot was, gulp, a fizzle presumably due to too much gas injected by the DNB. Initial pressure was 0.08 mT, even though pulse gas fill had been reduced by 5 ms. For next shot, pulse gas fill pulse width set at 18 ms, down from 22. |
| Jun 14 2000 02:58:49:343PM | 1000614016 | Ron Parker | Shot ran as programmed, but fill pressure remains a bit high. Pulse gas fill width reduced by 2 ms for next shot. Next shot: Same I, B but density lowered to 0.8 10^20 m^-3. |
| Jun 14 2000 03:23:41:450PM | 1000614017 | Ron Parker | Shot 17 was a fizzle, even though initial fill pressure was reduced to ~0.07. Still too high? Next shot: reload 16, but reduce density to 0.8e20 m-3. |
| Jun 14 2000 03:30:56:090PM | 1000614018 | Ron Parker | Shot 18 ran as programmed. Good current rise. Next shot: Density will be reduced to 0.6e20 m-3. |
| Jun 14 2000 03:50:05:950PM | 1000614019 | Ron Parker | Shot 19 ran as programmed, but the density is running a little higher than programmed. Good current rise. Next shot: lower density to ~ 5e-19 m-3. |
| Jun 14 2000 04:11:12:293PM | 1000614020 | Ron Parker | Shot 20 ran as programmed, but density programming was still set for 6e19 m-3. Next shot: reduce density again to 5e19 m-3. |
| Jun 14 2000 04:37:24:780PM | 1000614021 | Ron Parker | Shot 21 ran as programmed, with the density at ~5.5e19 m-3. However, there was a severe disruption at ~1.1 s, probably due to low density and RF. Next shot: same startup, but density will ramp to 1e20 m-3 after DNB turns off. |
| Jun 14 2000 05:05:40:107PM | 1000614022 | Ron Parker | Shot ran well, with density rising to 1e20 m-3 after a low density phase (for DNB). 3 MW delivered to J-port antenna with resonable heating. Fill pressure creeping up due to higher gas pressure in DNB. Nevertheless no tuning will be attempted for the last shot. |
| Jun 14 2000 05:07:22:797PM | 1000614023 | Ron Parker | Shot 23 ran well with good power (3 MW per pair) from all ICRF antennas. Next shot: tomorrow morning |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:49:19:543AM | Plasma | Ok | |
| 2 | 10:05:32:780AM | Plasma | Ok | |
| 3 | 10:29:53:263AM | Plasma | Ok | |
| 4 | 10:48:18:187AM | Plasma | Ok | |
| 5 | 11:13:29:827AM | Plasma | Ok | |
| 6 | 11:30:29:763AM | Plasma | Ok | |
| 7 | 11:50:45:780AM | Plasma | Ok | |
| 8 | 12:09:48:467PM | Plasma | Ok | |
| 9 | 12:29:44:343PM | Plasma | Ok | |
| 10 | 12:49:53:373PM | Plasma | Ok | |
| 11 | 01:09:25:153PM | Plasma | Ok | |
| 12 | 01:29:58:200PM | Plasma | Ok | |
| 13 | 01:49:25:280PM | Plasma | Ok | |
| 14 | 02:08:45:513PM | Plasma | Ok | |
| 15 | 02:27:22:623PM | Plasma | Ok | |
| 16 | 02:48:46:577PM | Plasma | Ok | |
| 17 | 03:06:27:640PM | Plasma | Ok | |
| 18 | 03:22:47:030PM | Plasma | Ok | |
| 19 | 03:43:50:687PM | Plasma | Ok | |
| 20 | 04:00:20:763PM | Plasma | Ok | |
| 21 | 04:23:23:090PM | Plasma | Ok | |
| 22 | 04:42:47:340PM | Plasma | Ok | |
| 23 | 05:00:15:577PM | Plasma | Ok | |