| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Will Bergerson |
| Physics operator(s): | Earl Marmar |
| Engineering operator(s): | Roza Tesfaye,Bill Byford |
| Engineering Operator Run Comment |
| MP677/676/662. SL: Will Bergerson, PO: Earl Marmar |
| Session Leader Plans |
| Entered: Dec 7 2011 08:38:52:870AM |
| Author: Chi Gao |
| (backup) MP 662 HiReX Sr Startup MP
SL C. Gao PO Earl Marmar The goal of this run is intended to fulfill the initial calibration, focusing and alignment requirement of the HiReX Sr spectrometer. Tentative Run plan (subject to change with available time. part 2 has the priority) 1.Focusing tests (ref #1111206031 but no RF): get repeatable standard shots(need to be same Te) for HiReX focusing test until focusing curve is completed on all modules. 2. Locked mode calibration (ref #1110329010): when focusing test is done, continue running locked mode discharges until wavelength calibration is confirmed. 3. Absolute Ar density tests (ref #1110128009): if time allows, we may have some low density discharges with different argon injection time to try measuring absolute argon density. |
| Physics Operators Plans |
| Entered: Dec 6 2011 04:58:52:813PM |
| Author: Earl Marmar |
| PhysOp Plan and Engineering setup for Wednesday, 07-Dec-2011
MP677/676/662 SL: Will Bergerson PO: Earl Marmar ----------------- Engineering Setup ----------------- Overnight ECDC in D2: ECDC Parameters: ------------------------------ gas and pressure: D2 at 2e-4 Torr sweep: 44/45/103 cm scan: 20/120 s Vessel Temp for ECDC 60/60/60 --------------------------------------- Run begins at 09:00 and ENDS AT 15:00 (PSFC party) Power systems as on: 1111202030, BUT will run several TF only shots at the beginning of the day 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 DISABLED (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill NINJA with 10 psi D2 DISABLED Enable gate-valves and shutters: ECE, HiREX Sr, Xeus, LoWEUS Z-bolo shutter should be closed unless requested by physop Torvac gatevalve toggle (yes/no): no Boronization(yes/no): no Overnight ECDC (yes/no): YES ICRF(yes/no): optional LH(yes/no): no Cryopump (yes/no): no DNB (yes/no): Allowed on request Vessel temperature: 35/35/35 plan: Start with MP677, TF only shots for polarimetry (~4 shots) Then go to MP676, Faraday Rotation with small Ip ramps backup MP: MP662, HiRex Sr startup, including shots with locked modes |
| Session Leader Summaries |
| Entered: Dec 7 2011 03:26:44:743PM |
| Author: Will Bergerson |
| Full day with a lot to look at for Polarimetery. The TF shots are very interesting and currently give us a much better idea of what the noise level is like at the flat top and a slow drift not seen in the last campaign. That the drift is present on one shot and not the next for a given chord makes it tricky to isolate but the rate is so slow that it also is doubtful to cause too much of a problem for this campaign.
The IP ramps are helpful, that Ne comes along for the ride of course makes the analysis a little bit more complicated. I'm pretty confident though that we'll be able to map out a decent sensitivity to IP. The TF ramps within the shot in conjunction with the multiple shots at different values for Bt should allow for determination of corruption above or below the noise floor. Analysis to follow that tries to compensate for the Ne variation. finally, the low frequency data on shot 27 doesn't look worse than 26 suggests that the upper box really isn't perturbed by sound as much as it used to be. We'll do follow up thumper tests on Monday. Thank you all in and out of the control room for assisting with the run. |
| Physics Operator Summaries |
| Entered: Dec 7 2011 03:21:34:830PM |
| Author: Earl Marmar |
| The machine ran reasonably well today.
Shots 1 and 2 were TF only tests (MP 677) The first plasma (shot 3) was a 1 MA disruption (apparent impurity influx), followed by 2 fizzles. Then we got 9 good startups. Shot 14 was another 1 MA disruption (overfueled by ninja), and then we had several fizzles (6 out of 8 tries). The last 5 shots were good. There were no power supply problems today. One shot was delayed when we were stuck in recool. scorecard: Shot,Duration(s),Ipmax(MA),Result Shot,Duration(s),Ipmax,Result | 01 0.000 0.003 Dud | 02 0.000 0.003 Dud | | 03 0.655 1.023 Plasma | 04 0.000 0.037 Fizzle | | 05 0.000 0.035 Fizzle | 06 1.975 0.928 Plasma | | 07 1.949 0.927 Plasma | 08 1.911 0.935 Plasma | | 09 1.890 0.934 Plasma | 10 1.849 0.933 Plasma | | 11 1.843 0.932 Plasma | 12 1.901 1.018 Plasma | | 13 1.835 1.115 Plasma | 14 1.599 1.134 Plasma | | 15 0.000 0.051 Fizzle | 16 0.000 0.041 Fizzle | | 17 0.000 0.041 Fizzle | 18 1.847 1.102 Plasma | | 19 0.000 0.037 Fizzle | 20 1.845 1.006 Plasma | | 21 0.000 0.038 Fizzle | 22 0.000 0.040 Fizzle | | 23 1.926 1.008 Plasma | 24 1.870 0.814 Plasma | | 25 1.922 0.815 Plasma | 26 1.933 0.816 Plasma | | 27 1.883 0.814 Plasma Date 1111207: 27 shots. 17 plasmas. 8 fizzles. 2 duds. 0 System Error. (Plasma = Ip gt 60.0 kA Dud = H_alpha lt 0.10 V) Total plasma duration: 30.63 s (exceeding -100 kA) |
| Session Leader Comments | |||
| Dec 7 2011 08:07:24:917AM | Will Bergerson | I'd like to start with the two TF only tests at 150 KA.
Goal: Establish the TF only noise and determine noise at the flattop for analysis during the campaign. As we are not piggy backing on someone else, the current dither that is in the listed shot in the MP should be modified as follows. 1) Move towards the start of the flat top and extend it from a single IP increase / decrease to multiple cycles of increasing and decreasing. It will be important to keep the density as constant as possible in this period. Goal: Determine the sensitivity to the plasma current the diagnostic has. Tweaks: (1) I'd like to vary the amplitudes of the dithers higher and lower as needed to find the sensitivity limit of the diagnostic. (2) I'd also like to look at a different initial target plasma upon which these dithers are made - adjusting IP*ne up or down. I'll punt that decision to the run time and guess that Jim wants to chime in on that one as well. I think that each target plasma and subsequent tweaks will need four shots. 2) Get a couple of plasmas with IP ~ 1MA and Ne ~ 10^20. Most of the shots thus far have resulted in modest phase changes for the diagnostic - ~ 10 degrees. Given parameters should push towards the other end of the diagnostic range. Goal: Record data with larger Faraday shifts to identify any potential problems. 2-3 Shots 3) We need to test if there is any Bt corruption of the measurements. The general theme is to have a constant IP and Ne, and ramp or scale Bt. The two approaches we would pursue would be Bt ramps within a single shot and multiple shots, matching IP and Ne, while scaling Bt as much as possible. Goal: Establish influence of Bt in measurement - For the Bt ramps within a shot it would be helpful to have a couple of repeat shots and then some with different IP and Ne ( higher or lower) and a follow up Bt ramp during the flat top. Technically, it doesn't matter if Bt is ramped up or down, but going up is more helpful. I don't know if this makes a big difference on the engineering side though. Tweaks: The rate and amplitude of the ramp within a single shot Bt ramped shots 5-10: Determining the threshold of Bt contamination in the signal is very important and may require a number of shots to test a net delta Bt that has a derivative that isn't corrupting the measurement. It is already known that the derivative causes some problems. - For the scaled Bt measurements, it is important to match the density and IP as much as possible while changing Bt as much as possible. For a given IP and Ne, three (two if there is a time crunch) different Bt's would be helpful ( 2-3 shots apiece). 4) Acoustic test. If the previous tests have been satisfied, I'd like to take a panel off the upper enclosure to test the effects of sound on the measurement. Should take 1 shot. 5) If the acoustic test isn't terrible, and there is time I'd like to do a beam co-linearity test. It will take more than 10 minutes to set up (up to 20), but has to be done at some point before taking research data. | |
| Dec 7 2011 09:12:00:990AM | 1111207001 | Will Bergerson | Less than 0.5 degree drift at flat top and noise below 0.5 degree as well.
typical problems at TF ramp. Offset at t =0 depends on Channel, and which reference is used. Beam issue not seen, but shutter open and may be signal may be swamping thier noise. |
| Dec 7 2011 10:04:22:020AM | 1111207002 | Will Bergerson | Looks like the noise at the flattop is dominated by ~30 hz - Peng reports
02 upper and 01 lower have differing values of offset at t = 0s. in comparison between TF shots. AC noise below 0.5 degrees. 01U and 02U are ~0.2. DC ramp error exists on some channels for the 0 sec -> 0.5 sec, but settles down after that. oddly the ref/ ref signal has differences between 01 and 02 as well. Didn't expect that oen. .5 deg offset on 01 (flat at flattop) and .2 degree on 2 with dc ramp to follow in flattop. |
| Dec 7 2011 10:06:33:560AM | 1111207003 | Will Bergerson | starting current modulation
will adjust dithers on a shot by shot basis. Didn't make it but the measurements look good. Nice tracking of the density evolution prior to disruption. |
| Dec 7 2011 10:46:05:853AM | 1111207006 | Will Bergerson | seeing a dither in signals, but timing looks to be delayed a little. going to shoter flattop to reduce effect from density drift.
core-most chord is pretty flat and there is a correlated dither on 2 and 3, next two outward from core, but oddly, suspected phase flip in #3 puts 2 and 3 IN phase. dither on #3 ~1 degree |
| Dec 7 2011 11:15:24:290AM | 1111207008 | Will Bergerson | density evolution is increasing as well. but dithers now look stronger in the core-most chord. Delta IP at 1.1 sec. looks good and appears correlated to #1 and #2. Don't see a delay on this one. |
| Dec 7 2011 11:23:15:800AM | 1111207009 | Will Bergerson | density evolution is increasing as well - Rapid 3-4 degree on edge most chord but larger phase is probably a result of density change in the signal as well.
#1 and #3 have a nice signature at 1s and 1.2s, right at the notch in IP. ~1 degree change in #3 at 1 sec as IP ramps down and Density is pretty flat. -> only 20 KA change |
| Dec 7 2011 11:39:26:550AM | 1111207010 | Will Bergerson | looks like a degree drop on #3upper at the two 20 ka drops ending at 1.1 and 1.35
following ramps are about a degree on #1 upper- good density control in these regions. |
| Dec 7 2011 12:19:14:293PM | 1111207012 | Will Bergerson | keeping a single dither on the back of the flat top but moving to try for larger net phase changes by increasing IP * Ne.
single dithers are a little easier to track on the signals |
| Dec 7 2011 12:43:24:373PM | 1111207013 | Will Bergerson | Nice ~15 degree phase shifts on signals. #3 still looks a little noiser, but it may be a reflection that chord is closer to the edge and simply not as clean. It also has the new style det. on it.
pre TF noise is great. 0.1 deg. Have to figure out the 30 hz though 1.26 - 1.32. ne_04 is flat with IP dropping 20 ka. Signal on #1 and #3 looks well correlated with it and total phase chage on #1 = 1.5 deg and on #3 2 deg. Have to examine again later with higher time resolution. |
| Dec 7 2011 12:36:54:350PM | 1111207014 | Will Bergerson | Nice ~15 degree phase shifts on signals - just before the disruption. Signals look pretty clean actually. Phase noise after disruption only 1 degree on the uppers. Last campaign I recall amplitudes much larger than that. |
| Dec 7 2011 01:19:03:157PM | 1111207018 | Will Bergerson | pretty immediate response to the IP change on #3 and #1 after. #2 still doesn't look quite like either other chord. Strange. |
| Dec 7 2011 01:44:31:423PM | 1111207020 | Will Bergerson | starting the BT ramps within a shot. target was 5.4 -> 6T
#3 looks good and #2 has a positive and negative swing during the Bt ramp which suggests something besides CM effects or geometry misalignment Changes in #1 are more dynamic but def. not any kind of linear / quadratic sweep associated with Bt |
| Dec 7 2011 02:21:39:970PM | 1111207023 | Will Bergerson | Dynamics are pretty rich during the TF ramp, but the signals don't exhibit a unipolar change in phase. More suggestive to me that ne profiles are shifting around. may need a matched shot in the future with efit running. |
| Dec 7 2011 02:30:25:843PM | 1111207024 | Will Bergerson | trying for two shots with matched IP and Ne at different Bt. Hope we can hit them in time remaining. |
| Dec 7 2011 03:05:15:020PM | 1111207025 | Will Bergerson | initial comparisons look pretty good. We'll have to do more careful look off line try to compensate for rough Ne differences. |
| Dec 7 2011 02:58:09:420PM | 1111207027 | Will Bergerson | took the smallest panel off the enclosure to test effects on signal with more noise getting into upper enclosure. |
| Physics Operator Comments | |||
| Dec 7 2011 09:12:10:553AM | 1111207001 | Earl Marmar | TF only test, with gas
load from 1111206034 turn fizzle on to 2.09 s (so fizzle detector doesn't take out the TF) leave gas on nl_04 target to -3e19 in segment 2 TF ok got gas |
| Dec 7 2011 09:32:39:167AM | 1111207002 | Earl Marmar | repeat
ok |
| Dec 7 2011 09:45:57:307AM | 1111207003 | Earl Marmar | go for plasma
reload 1111206034 prefill puff to 17 ms Ip to 1 MA nl_04 target to 9e19 put in 3 little Ip ramps (+/- 20 kA) during "flattop" according to session leader request plasma, disrupt at 0.65s, preceded by large uptick in Prad |
| Dec 7 2011 09:51:46:480AM | 1111207004 | Earl Marmar | reduce Ip in "flattop" by 100 kA, now averaging 900 kA
fizzle |
| Dec 7 2011 09:51:27:907AM | 1111207005 | Earl Marmar | reduce prefill puff to 16 ms (from 17 ms) |
| Dec 7 2011 10:27:48:030AM | 1111207006 | Earl Marmar | reduce prefill puff to 14 ms (from 16 ms)
plasma, full length |
| Dec 7 2011 10:30:58:907AM | 1111207007 | Earl Marmar | tweak the current ramps (shorten each, add a fourth)
enable argon (50 ms pulse) plasma, full length |
| Dec 7 2011 10:52:01:630AM | 1111207008 | Earl Marmar | argon puff to 100 ms
change Ip ramps: +30 kA, -20 kA around 900 kA. plasma, full length hesitation during startup current rise |
| Dec 7 2011 11:13:32:843AM | 1111207009 | Earl Marmar | nl_04 target to 1.0e20
plasma, full length got to nl_04~9e19 |
| Dec 7 2011 11:21:54:533AM | 1111207010 | Earl Marmar | no dpcs changes
plasma, nearly full length, marfe during Ip rampdown initial Ip rise looks better |
| Dec 7 2011 11:39:12:217AM | 1111207011 | Earl Marmar | Ip ramp changes: slow the ramp rate (delta I in 70 ms instead of 50 ms); reduce time at each current (to 50 ms, from 70 ms).
bounce in startup, early hards |
| Dec 7 2011 11:50:06:087AM | 1111207012 | Earl Marmar | Ip to 1.0 MA, with one small scan after 1.2 s
nl_04 target to 1.05e20 plasma, full length better startup, no hards |
| Dec 7 2011 12:12:52:643PM | 1111207013 | Earl Marmar | Ip to 1.1 MA, with one small scan after 1.2 s
nl_04 target to 1.15e20 plasma, nearly full length |
| Dec 7 2011 12:22:40:263PM | 1111207014 | Earl Marmar | modify the Ip scan at end of "flattop", now +50kA, -20 kA, increase hold time to 100 ms
plasma, disrupt at 1.6 second, ~ 1MA; preceded by significant density ramp-up, ninja is suspected |
| Dec 7 2011 12:37:10:287PM | 1111207015 | Earl Marmar | prefill puff to 12 msec, expect a fizzle
and got one |
| Dec 7 2011 12:53:34:270PM | 1111207016 | Earl Marmar | no dpcs changes
fizzle |
| Dec 7 2011 12:54:11:300PM | 1111207017 | Earl Marmar | no dpcs changes
fizzle |
| Dec 7 2011 01:18:23:917PM | 1111207018 | Earl Marmar | reduce argon puff to 75 ms (from 100 ms)
Ip 1.1 MA to 1 sec, then drop to 900 kA until 1.5 s plasma, nearly full length |
| Dec 7 2011 01:20:56:943PM | 1111207019 | Earl Marmar | prefill puff to 13 ms (from 12 ms)
Ip to 1.0 MA straight across Bt ramp from 1.0 to 1. 5 seconds (150 kA to 168 kA) [TF PLC current limit raised to 175 kA] fizzle |
| Dec 7 2011 01:45:04:820PM | 1111207020 | Earl Marmar | prefill puff to 12 ms (from 13 ms)
plasma, nearly full length |
| Dec 7 2011 01:45:49:153PM | 1111207021 | Earl Marmar | TF ramp to 168 kA at 0.5 s, then flat to 0.9 s, then ramp to 184 kA at 1.5 s
[TF PLC limit to 200 kA] fizzle |
| Dec 7 2011 01:58:41:903PM | 1111207022 | Earl Marmar | no dpcs changes
fizzle |
| Dec 7 2011 02:16:15:670PM | 1111207023 | Earl Marmar | prefill puff to 14 ms (from 12 ms)
plasma, full length |
| Dec 7 2011 02:29:20:880PM | 1111207024 | Earl Marmar | Bt to 4.0 T (112 kA)
Ip to 0.8 MA nl_04 target to 0.9e20 plasma, nearly full length |
| Dec 7 2011 02:47:53:953PM | 1111207025 | Earl Marmar | Bt to 6.0 T (168 kA)
plasma, full length |
| Dec 7 2011 02:58:41:970PM | 1111207026 | Earl Marmar | Bt to 6.5 T (185 kA)
plasma, full length |
| Dec 7 2011 03:13:52:810PM | 1111207027 | Earl Marmar | import segment 2 from 1111207025 into segment 2 (6.0 tesla)
plasma, nearly full length |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:58:52:843AM | Plasma | Ok | |
| 2 | 09:12:59:463AM | Test | Ok | TF only shot (same as 1) |
| 3 | 09:33:30:543AM | Plasma | Ok | |
| 4 | 09:46:51:313AM | Plasma | Ok | |
| 5 | 09:59:27:853AM | Plasma | Ok | |
| 6 | 10:11:47:897AM | Plasma | Ok | |
| 7 | 10:27:42:313AM | Plasma | Ok | |
| 8 | 10:41:44:327AM | Plasma | Ok | |
| 9 | 10:55:24:490AM | Plasma | Ok | |
| 10 | 11:11:18:590AM | Plasma | Ok | |
| 11 | 11:26:45:800AM | Plasma | Ok | |
| 12 | 11:44:12:670AM | Plasma | Ok | |
| 13 | 11:57:50:077AM | Plasma | Ok | |
| 14 | 12:12:51:007PM | Plasma | Ok | |
| 15 | 12:26:43:193PM | Plasma | Ok | |
| 16 | 12:39:46:227PM | Plasma | Ok | |
| 17 | 12:52:23:577PM | Plasma | Ok | |
| 18 | 01:04:54:243PM | Plasma | Ok | |
| 19 | 01:18:40:720PM | Plasma | Ok | |
| 20 | 01:31:18:597PM | Plasma | Ok | |
| 21 | 01:43:58:760PM | Plasma | Ok | |
| 22 | 01:56:39:403PM | Plasma | Ok | |
| 23 | 02:09:07:820PM | Plasma | Ok | |
| 24 | 02:25:49:510PM | Plasma | Ok | |
| 25 | 02:38:35:280PM | Plasma | Ok | |
| 26 | 02:50:57:530PM | Plasma | Ok | |
| 27 | 03:04:08:230PM | Plasma | Ok | |
| System Availability | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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