| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Andrea Schmidt |
| Physics operator(s): | Ron Parker |
| Engineering operator(s): | Andy Pfeiffer,Gary Dekow |
| Engineering Operator Run Comment |
| automatically entered by signon - please replace with real comment |
| Session Leader Plans |
| Entered: Aug 24 2010 01:41:39:873PM |
| Author: Andrea Schmidt |
| Continuation of MP 468 (LH Modulation)
After 2 failed attempts at LH coupling with the modulated waveform, the approach for this run day will be a little different. I will start by trying to establish good coupling for the conditions and phasing that I want with constant power and then move on to get modulated data. Atma has come up with a scheme to mask the reflection coefficients during each pulse turn on and that will be used in this run. 1) Try to establish good coupling for the first condition that I want (600 kA, nl04=5e19, 146 deg phasing), at constant power. To do this, first call up shot 1100818030. Raise density slightly (request nl04=.04 for the flat top). Try LH into plasma. Adjust launcher position and outer gap as needed to obtain good coupling. If needed, phasing can be reduced (not prefferable). When this is established, move on to 2) 2) Try modulated waveform into plasma, using Atma's scheme. Obtain 4-6 clean discharges at these conditions. 3) Try to establish good coupling for the second condition (1000 kA, nl04=5e19, 146 deg phasing), at constant power. To do this, raise the current in increments of 200 kA, and adjust launcher position and outer gap as needed to obtain good coupling. 4) Try modulated waveform into plasma. Obtain 4-6 clean discharges at these conditions. |
| Physics Operators Plans |
| Entered: Aug 24 2010 02:14:52:790PM |
| Author: Yijun Lin |
| Wednesday, August 25, 2010
MP468- LH driven fast electron diffusion time measurement PO/APO: Parker/Lin, SL: Schmidt ------------------ Engineering Setup ----------------- Run begins at 09:00 and ends at 17:00 Power systems as on: 1100818030 Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid Enabled Gas setup: Fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) leave NINJA as is DISABLED Enable gate-valves and shutters: ECE, VUV, HiREX Sr, Xeus Leave z-bolo shutter as is (should be open) Torvac gatevalve toggle (yes/no): no Boronization(yes/no): no Overnight ECDC (yes/no): yes ICRF(yes/no): no LH(yes/no): yes Cryopump (yes/no): yes Vessel temperature: 35/35/35 overnight ECDC Gas Setup Gas: D2 sweep: 44/45/103 cm scan: 20/120 s Pressure: 2.0e-4 Torr ------------------------- Required system: LH, HXR array, Cryopump --------- Start with 0.6 MA discharge, and will run 1 MA later. |
| Session Leader Summaries |
| Entered: Aug 26 2010 01:08:41:923PM |
| Author: Andrea Schmidt |
| Continuation of MP 468 (LH Modulation)
Given the difficulties encountered the last two times this MP was run, I proceeded with much more caution on this run day and got better results as well. We started with a low-current discharge that ran well last week at lower LH phasing (without modulation). Slowly over the course of the first 13 shots, we brought the phasing and power up, and adjusted the outer gap to get reasonable coupling. Orso's probe density v. refco plotting routine was a big help in knowing that we needed to reduce the outer gap to get better coupling. We did a little backtracking in the morning when we pushed the launcher in, which seemed to cause some Ti and Ni ejections, and had to pull it back out again. We also brought the lower x-point a bit further out in major radius so as to match the plasma shape to the launcher a little better (using the 3 different poloidal locations of LH probes as a guide), which also helped with refcos. On the last step before reaching condition 1, we put attenuators on two columns that were causing problems. We were able to use a waveform developed by Atma that effectively masks the refcos during turn on to successfully couple the modulated waveform. We took 6 shots at this condition, with only a few pulses tripping (some shots ran clean). We moved on to step 3 of the run plan, trying to develop a similar discharge at higher current (1 MA). We ended up with disruptions during the current ramp-up and ramp-down and several fizzles in between. By the time we got the plasma under control, the run day was over. We did try one modulated waveform into the high current plasma, but it tripped out during the entire LH pulse. Overall, the run day was somewhat successful, since we did obtain useable data at one condition which we had trouble with before. We also came close to getting the second condition, so we have a good starting point for another run. |
| Physics Operator Summaries |
| Entered: Aug 25 2010 06:02:01:013PM |
| Author: Ron Parker |
| A somewhat tedious run today. The goal was to establish 600 kA and 1 MA discharges for picket-fence modulation of lower hybrid power, according to senarios ooutlined in MP 468.
The first half of the run, shots 1-19 were used to set up a 600 kA discharge in order to get sufficient LH coupling to allow picket fence modulation at 145 degree phasing. After fine tuning of the outer gap, good shots were obtained with most of the modulated pulses useful for data analysis. Shots 14-19 were used to complete this part of the run plan. Up through shot 19 the machine ran well with 17 of 19 shots running full length while the other 2 shots disrupted due to strong interaction of the LH grill with the plasma caused by very small values of the outer gap (~2-4 mm) After shot 19, two full length 800 kA shots were run in preparation for increasing the current to 1 MA. Then, on shot 22, the current was increased to 1 MA. Unfortunately, the current disrupted during rampdown and this was the beginning of an extended period of frustration, as it proved difficult to establish a suitable 1 MA discharge. The cause of the disruption was traced to the development of a locked mode during rampdown. Shot 23 was the predictable post-disruption fizzle, shot 24 disrupted during ramp up, and shot 25 again fizzled as did shots 26 and 27. Finally the programming for shot 28 was tuned by reloading an 800 kA shot (shot 21), increasing the BR offset from 0.0000 to 0.0005 T and shortening the prefill by 5 ms. Shot 28 then ran full length (albeit at 800 kA.) Next, the programmed current was increased to 1 MA, and the shot ran through flattop but again disrupted during rampdown (as in shot 22, due to a locked mode). It was then rerun with a slower rampdown and, although a locked mode again developed during rampdown, it ran full length. The LH failed to stay on, however, due to high reflected power at the 145 phasing (due in turn to low density at the grill, even though the gap was only 4-5 mm. At that point we were out of time and the run was terminated. Running the LH with picket fence modulation at 1 MA, nl_04 = 5e19 and 145 degree phasing is clearly a challenge due to the need to provide the grill with sufficient density to avoid repeated trips. As in the case of the successful 600 kA part of the run, several discharges will be needed to establish a good, full length 1 MA target without locked modes. The outer gap will probably need to be only 2-4 mm in order that there will be enough density at the grill to reduce the reflection coefficient to ~ 50 %. Ninja puffs might be useful if the effect on the plasma density is tolerable. Achieving the 1 MA part of MP 468 will likely take most of a full run day to complete. |
| Session Leader Comments | |||
| Aug 25 2010 09:25:59:103AM | 1100825001 | Andrea Schmidt | Starting with a discharge that coupled well to LH last Wed (1100818030), except with 146 deg phasing (1100818030 was at 75 deg phasing). The LH trips continuously. For next shot, decreasing the outer gap to bring density up at the grill and moving to 110 deg phasing. |
| Aug 25 2010 09:26:34:970AM | 1100825002 | Andrea Schmidt | Many LH trips due to an operator error. Next discharge will be nearly the same, with a little bit higher requested density. |
| Aug 25 2010 09:40:13:620AM | 1100825003 | Andrea Schmidt | Clean shot for LH. Reflection coefficients are still pretty high. Next discharge we will move to a little higher power and higher phasing (130 deg). |
| Aug 25 2010 09:53:57:487AM | 1100825004 | Andrea Schmidt | LH ran pretty well with some trips at the end (and higher refcos). Next discharge will raise the density a little towards the end of the pulse and bring the LH power up a little. |
| Aug 25 2010 10:02:20:780AM | 1100825005 | Andrea Schmidt | LH ran well with only one trip at the end. We pushed the launcher in a little for the next discharge and will bring the power up a little too. |
| Aug 25 2010 10:17:50:513AM | 1100825006 | Andrea Schmidt | Disruption during LH. Next shot we will bring the phasing up to 135 (from 130) and bring power up a little. Plasma will stay the same. |
| Aug 25 2010 10:33:24:083AM | 1100825007 | Andrea Schmidt | Disruption during LH again. We will pull the launcher back again for the next shot. Also increasing phasing to 140 (from 135) for next shot and bringing power up a little again. |
| Aug 25 2010 10:54:02:737AM | 1100825008 | Andrea Schmidt | LH ran half the time, tripped half the time. We are going to try this shot again. |
| Aug 25 2010 11:14:04:887AM | 1100825009 | Andrea Schmidt | LH ran half the time, tripped half the time again. It seems the LH is causing the plasma density to rise and the density at the grill to fall. Orso's probe measurements are showing that the falling density at the grill is correlated with higher refcos. We are going to shrink the outer gap a little for the next shot to keep the density at the grill a bit higher. |
| Aug 25 2010 11:28:54:450AM | 1100825010 | Andrea Schmidt | Much better! A few trips. We will decrease the outer gap another 2 mm for next shot and leave everything else the same. |
| Aug 25 2010 12:09:49:590PM | 1100825012 | Andrea Schmidt | LH ran well with one trip. There are some hot spots on the launcher. We would like to get the density similar on all 3 probes, but lowest one is showing lower density than upper two. Next shot: increase outer gap by another mm, bring x-point further out another cm, move to 145 deg phasing (from 140) and bring power up a little. |
| Aug 25 2010 12:24:07:413PM | 1100825013 | Andrea Schmidt | LH ran well with one trip at the end. This is almost the best we have seen for 145 degree phasing. We are still seeing some small hot spots, but coupling is looking very good. We will try the modulated waveform into the next plasma. Since the average power of the modulated waveform is 50%, that should help the hot spot problem. |
| Aug 25 2010 12:38:35:343PM | 1100825014 | Andrea Schmidt | Modulated waveform ran beautifully! No trips. Will keep plasma same for next shot, bring LH power up a little bit. |
| Aug 25 2010 01:04:03:457PM | 1100825015 | Andrea Schmidt | Ran well again, no trips. Next shot will be the same. |
| Aug 25 2010 01:33:23:270PM | 1100825016 | Andrea Schmidt | Ran well again, lost one pulse. Next shot will be the same. |
| Aug 25 2010 01:34:11:823PM | 1100825017 | Andrea Schmidt | Lost 4 pulses this time. Next shot will be the same. |
| Aug 25 2010 01:52:27:917PM | 1100825018 | Greg Wallace | Covering as SL for Andrea for a few shots. Lost 3 pulses on this shot. Otherwise looks good. nl_04 = 5.1-5.4e19. Net LH power ~375 kW at 150 kW/klystron, 145 deg phasing. Next shot will repeat same conditions. |
| Aug 25 2010 02:29:57:807PM | 1100825018 | Andrea Schmidt | Mostly clean with a few trips. Next shot will be the same. |
| Aug 25 2010 02:11:01:303PM | 1100825019 | Greg Wallace | Got all LH pulses! Last shot at this condition. nl_04 = 5.4-5.6e19. 600 kA. Net LH power ~400 kW. 150 kW/klystron, 145 deg phasing.
Next shot will be 80 kW/klystron steady, 145 deg, Ip = 800 kA. |
| Aug 25 2010 02:30:52:420PM | 1100825019 | Andrea Schmidt | Ran clean. Moving to 800 kA on next shot (no modulation, bringing power down). |
| Aug 25 2010 02:32:41:207PM | 1100825020 | Andrea Schmidt | Mostly trips with one extended pulse. The outer gap was increased as a cautionary measure for this pulse. Next shot we will decrease outer gap so as to bring the density at the grill up again and hopefully lower refcos. |
| Aug 25 2010 02:44:23:387PM | 1100825021 | Andrea Schmidt | Ran clean, very high refcos. We're going to move to 1 MA and keep the outer gap the same for the next shot. |
| Aug 25 2010 03:20:50:877PM | 1100825022 | Andrea Schmidt | Ran clean, refcos still around 60%. Next shot reduce outer gap. |
| Aug 25 2010 03:21:01:010PM | 1100825023 | Andrea Schmidt | No plasma. Try again. |
| Aug 25 2010 03:32:39:793PM | 1100825024 | Andrea Schmidt | Early disruption. Try again. |
| Aug 25 2010 03:42:45:860PM | 1100825024 | Andrea Schmidt | No plasma. Try again. |
| Aug 25 2010 04:08:50:303PM | 1100825025 | Andrea Schmidt | No plasma. Try again. |
| Aug 25 2010 04:08:57:103PM | 1100825026 | Andrea Schmidt | No plasma. Try again. |
| Aug 25 2010 04:09:03:930PM | 1100825027 | Andrea Schmidt | No plasma. Try again. |
| Aug 25 2010 04:36:59:960PM | 1100825028 | Andrea Schmidt | This plasma ran, but at 800 kA. LH did not couple at all (trips). Bringing plasma up to 1 MA again for next shot. |
| Aug 25 2010 05:04:58:360PM | 1100825030 | Andrea Schmidt | This plasma ran at 1 MA. We tried modulated waveform into this plasma, but got all trips. End of run. |
| Physics Operator Comments | |||
| Aug 25 2010 09:15:54:190AM | 1100825001 | Ron Parker | All systems ready at 9:00.
First shot should be a replay of 1100818030, although we are using a startup from yesterday, namely 1100824031. |
| Aug 25 2010 09:17:02:653AM | 1100825001 | Ron Parker | Shot 1 ran well, full length. However, LH reflection was high and tripped throughout shot. Also density rose unexpectedly beginning around 1 s. Apparently this was due to a Ninja puff. Ninja was not disabled as had been specified in PO's plan. |
| Aug 25 2010 09:17:46:313AM | 1100825001 | Ron Parker | For shot 2, decrease outer gap by 0.5 cm. Also, disable Argon puff and Ninja. |
| Aug 25 2010 09:25:25:323AM | 1100825002 | Ron Parker | Shot 2 ran well, full length. Nice density control, Again, reflections too large for LH to stay on.
Outer gap was reduced as programmed to ~ 0.8 cm For next shot, density increased to nl_04=4.5e19 m-2 |
| Aug 25 2010 09:39:20:500AM | 1100825003 | Ron Parker | Shot 3 ran full length. LH stayed on throughout its gate, but reflection is still ~ 40%. Weak current drive and some nonthermal ECE produced, also a little electron heating.
Next: Same shot, but LH phasing will be increased from 110 to 130 degrees. |
| Aug 25 2010 09:52:51:490AM | 1100825004 | Ron Parker | Shot 4 ran full length. LH reflection increases during the shot and LH trips several times late in pulse.
Next: Program a slight density ramp during LH pulse to try to maintain better coupling. |
| Aug 25 2010 10:08:29:953AM | 1100825005 | Ron Parker | Shot 5 ran well, full length.
LH almost made it to the end of its gate without faulting, but RC is 45% at end of pulse. OH resistance is climbing, set fizzle detector at 2.1 (was 1.8). On the next shot, the grill will be pushed in flush with its limiter. |
| Aug 25 2010 10:20:13:703AM | 1100825006 | Ron Parker | Shot 6 disrupted during LH pulse. Grill too close to plasma?
Next: Same shot, see if we can get through LH pulse. May fizzle? |
| Aug 25 2010 10:35:25:187AM | 1100825007 | Ron Parker | Shot 7 disrupted again, better move launcher back, perhaps close outer gap a bit.
Next: Outer gap reduced by 2 mm (from 6 to 4 mm), launcher pulled back 0.1 mm. |
| Aug 25 2010 10:55:45:380AM | 1100825008 | Ron Parker | Shot 8 ran full length again. Apparently LH grill flush with its limiters is not a good situation, possibly producing impurities from the D-port antenna/Faraday shield (Ti) |
| Aug 25 2010 11:13:40:713AM | 1100825009 | Ron Parker | Shot 9 ran full length, but LH still has problems with high reflection.
Next: reduce outer gap by 2mm, from .6 to .4 cm (This should have already been the case (?)) After this shot there will be a cell access. |
| Aug 25 2010 11:28:40:997AM | 1100825010 | Ron Parker | Shot 10 again ran full length. LH ran with only a couple of trips -- seems reducing the outer gap is in the right direction.
Next: reduce outer gap still further, by 2 mm, from 4 to 2. |
| Aug 25 2010 12:02:08:193PM | 1100825011 | Ron Parker | Shot 11 ran full length. LH ran well for 0.2 s with RC =0.4, but suddenly grill arcing occurred and LH did not recover.
Next: increase outer gap by 1 mm, move RXL out 1 cm |
| Aug 25 2010 12:09:50:870PM | 1100825012 | Ron Parker | Shot 12 ran full length. LH coupled but some arcing still on coupler.
Next: Open right gap 2 mm, move RXL out another cm in order to better match shape. |
| Aug 25 2010 12:22:18:717PM | 1100825013 | Ron Parker | Shot 13 ran full length. LH mostly survived although RC is rather high, nearly 50%. Also, hot spots still showing up on coupler, not as bad as the strong interaction on earlier shot, but still not acceptable. These may disappear with modulation, which we'll try next.
|
| Aug 25 2010 01:04:56:063PM | 1100825014 | Ron Parker | Shot 14 ran full length, LH modulation ran through as programmed even tho the RC approached 60 %. |
| Aug 25 2010 01:05:51:033PM | 1100825015 | Ron Parker | Shot 15 ran full length, good LH modulation. Power pushed to 400 kW.
No plasma programming changes for next shot. |
| Aug 25 2010 01:27:17:943PM | 1100825016 | Ron Parker | Shot 16 ran full length, more good data for the MP. |
| Aug 25 2010 01:29:10:753PM | 1100825017 | Ron Parker | Shot 17 ran full length, more good data for the MP. |
| Aug 25 2010 01:52:47:753PM | 1100825018 | Ron Parker | Shot 18 ran full length, more data for MP
Next shot should be the last at this current. Plan is to raise current to 800 kA for shot 19. |
| Aug 25 2010 02:10:05:183PM | 1100825019 | Ron Parker | Shot 19 ran full length, picket fence had all its pickets.
Next: 800 kA, steady LH power, same density. |
| Aug 25 2010 02:20:21:710PM | 1100825019 | Ron Parker | Next shot: (Y. Lin)
Reduce Rcur by 0.003 m, to 0.6625 m Raise Ip to 800 kA. Same RXL, same nl_04. LH constant power. |
| Aug 25 2010 02:44:41:650PM | 1100825020 | Ron Parker | ran. full length.
LH tripping. Outergap was too much, and density in front of the grill too low. (pre-fill gas pressure jumped. Most likely due to cryo-pump). next: (y. Lin) reduce outergap from 0.9 to 0.4 cm. Increase Rcur by 0.003 m. Also make Ip rising slightly faster. same density, same shape. |
| Aug 25 2010 02:49:55:263PM | 1100825021 | Yijun Lin | Ran. Full length. NO LH drop. Outer gap 0.5 cm.
Startup normal. next: Raise current to 1 MA. Same shape and density. |
| Aug 25 2010 03:07:54:840PM | 1100825022 | Yijun Lin | Ran. disruption at 1.7 sec. NO LH drop. Outer gap 0.65 cm.
Startup normal. next: Lower outer gap to 0.4 cm (raise Rcur by 0.0015 m) Make current rising faster. Also move density feedback length longer. |
| Aug 25 2010 03:24:11:580PM | 1100825023 | Yijun Lin | Post-disruption fizzle.
the disruption screwed up the startup. Plasma current did not rise after breakdown (failed to burnthrough) No change in DPCS. |
| Aug 25 2010 03:38:36:563PM | 1100825024 | Yijun Lin | Start up normal.
Locked mode at 0.38 sec. during current ramp up. Disrupted at 0.42 sec 0.8 MA. Two issues: current ramp up not ideal or density too low. Next: Make current ramp up slower. To get flat top 0.65 sec. Raise density in the early part of plasma from nl04=0.45e20 to 0.55e20, then down to 0.5e20 for LH. |
| Aug 25 2010 03:44:21:033PM | 1100825025 | Yijun Lin | Another post-disruption fizzle.
Failed to burnthrough. Similar to shot 23. Next: no dpcs change. (I may have to change pre-fill if there is another disruption...) |
| Aug 25 2010 04:03:15:243PM | 1100825026 | Yijun Lin | Another fizzle.
Gas prefill looks ok. Fields look ok. Breakdown ok. Failed to burnthrough (presumably, plasma too dirty). Next shot: no dpcs change. |
| Aug 25 2010 04:21:20:883PM | 1100825027 | Yijun Lin | Another fizzle.
Next shot: shorten PG4 by 5 ms. Br0 offset from 0 to 0.0005. reload seg 2 from 1100825021 (0.8 MA good shot). |
| Aug 25 2010 04:35:17:893PM | 1100825028 | Yijun Lin | Plasma full length.
Prefill gas pressure slightly lower. Br0 closer to 0. LH tripping. Outer gap 0.5 cm. Next shot: ramp current to 1 MA at 0.75 sec (slow rampup). Increase Rcur by 0.001 m. |
| Aug 25 2010 04:50:01:510PM | 1100825029 | Yijun Lin | Plasma. 1 MA. Disruption during rampdown.
Outergap 0.4 cm. LH tripped. next shot: Start Ip ramp down at 1.4 sec (instead of 1.6 sec). |
| Aug 25 2010 05:00:39:983PM | 1100825030 | Yijun Lin | Plasma full length.
After lower the ramp down rate, no disruption in ramp down. again, late breakdown, but survived. (no post-disruption fizzle). End of run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:58:08:290AM | Plasma | Ok | |
| 2 | 09:14:23:137AM | Plasma | Ok | |
| 3 | 09:27:15:797AM | Plasma | Ok | |
| 4 | 09:40:44:773AM | Plasma | Ok | |
| 5 | 09:54:03:927AM | Plasma | Ok | |
| 6 | 10:08:49:290AM | Plasma | Ok | |
| 7 | 10:23:27:907AM | Plasma | Ok | |
| 8 | 10:39:56:157AM | Plasma | Ok | |
| 9 | 10:59:36:897AM | Plasma | Ok | |
| 10 | 11:16:31:363AM | Plasma | Ok | |
| 11 | 11:32:37:793AM | Plasma | Ok | |
| 12 | 11:49:35:380AM | Plasma | Ok | |
| 13 | 12:11:29:660PM | Plasma | Ok | |
| 14 | 12:32:12:303PM | Plasma | Ok | |
| 15 | 12:50:55:570PM | Plasma | Ok | |
| 16 | 01:09:36:147PM | Plasma | Ok | |
| 17 | 01:26:13:207PM | Plasma | Ok | |
| 18 | 01:43:51:730PM | Plasma | Ok | |
| 19 | 02:04:30:813PM | Plasma | Ok | |
| 20 | 02:21:08:717PM | Plasma | Ok | |
| 21 | 02:36:48:807PM | Plasma | Ok | |
| 22 | 02:53:44:010PM | Plasma | Ok | |
| 23 | 03:10:35:413PM | Plasma | Ok | |
| 24 | 03:25:06:870PM | Plasma | Ok | |
| 25 | 03:38:59:160PM | Plasma | Ok | |
| 26 | 03:51:56:180PM | Plasma | Ok | |
| 27 | 04:05:33:907PM | Plasma | Ok | |
| 28 | 04:21:48:803PM | Plasma | Ok | |
| 29 | 04:36:19:750PM | Plasma | Ok | |
| 30 | 04:55:58:293PM | Plasma | Ok | |
| System Availability | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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