| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Syunichi Shiraiwa |
| Physics operator(s): | Robert Granetz,Earl Marmar |
| Engineering operator(s): | Bill Parkin,Gary Dekow |
| Engineering Operator Run Comment |
| Current profile evolution due to LHCD |
| Session Leader Plans |
| Entered: Nov 3 2010 07:49:21:957PM |
| Author: |
| This is an attempt to obtain a current profile evolution due to
LHCD with good time resolution. Reference discharge is 1101019014 (500kA, 5.4 T, upper single null with cryo-pump) Step. 1) Take no dnb shots. to carefully document the entire time history of background Step. 2) Repeat a set of discharges with different DNB start timing. SET A. DNB start time = 0.65, 0.74, 0.83, 0.92, 1.01, 1.10 s SET B. DNB start time = 0.69, 0.78, 0.87, 0.96, 1.05, 1.14 s DNB on/off time is 50/40 ms The idea is average pitch angle measurements over multiple discharges, instead of averaging over a long time in a single discharge. At least four identical zero loop voltage discharge is necessary. Step. 3) If the time allows, do the step 2 with different density and phasing. (different density is to improve the s/n of MSE) Step. 4) Take relatively high density discharges (Ip can be high too), to compare the edge pitch angle measurement with analysis tree EFIT. (This would take ? (5??) discharges, assuming we need several discharges to setup the optimum target for this, I propose to finish step 3 by 3:30 PM) |
| Entered: Nov 3 2010 07:49:22:757PM |
| Author: Syunichi Shiraiwa |
| This is an attempt to obtain a current profile evolution due to
LHCD with good time resolution. Reference discharge is 1101019014 (500kA, 5.4 T, upper single null with cryo-pump) Step. 1) Take no dnb shots. to carefully document the entire time history of background Step. 2) Repeat a set of discharges with different DNB start timing. SET A. DNB start time = 0.65, 0.74, 0.83, 0.92, 1.01, 1.10 s SET B. DNB start time = 0.69, 0.78, 0.87, 0.96, 1.05, 1.14 s DNB on/off time is 50/40 ms The idea is average pitch angle measurements over multiple discharges, instead of averaging over a long time in a single discharge. At least four identical zero loop voltage discharge is necessary. Step. 3) If the time allows, do the step 2 with different density and phasing. (different density is to improve the s/n of MSE) Step. 4) Take relatively high density discharges (Ip can be high too), to compare the edge pitch angle measurement with analysis tree EFIT. (This would take ? (5??) discharges, assuming we need several discharges to setup the optimum target for this, I propose to finish step 3 by 3:30 PM) |
| Physics Operators Plans |
| Entered: Nov 4 2010 12:15:22:620AM |
| Author: Robert Granetz |
Engineering setup for Thursday 2010/11/04
MP463 - Reaching zero loop voltage with LHCD
Session leader: S. Shiraiwa
Physics operator: R. Granetz
Overnight: standard ECDC and 60 C bake.
Run will start at 09:00 and end at 17:00.
Power systems as on: 1101019014 (0.5 MA, 5.4 T, 0.3e20 m-2 target, USN,
cryopump)
A-coil configuration: +Dtop -Dbot -Jtop +Jbot; Hybrid enabled (standard
configuration)
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)
fill NINJA with 10 psi D2
Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo, HIREX-Sr, B-spectrometer GV
Torvac setup: keep gate valves open during pulse
Specific diagnostics: DNB, MSE
------------------------------------------------------------------------------
Boronization: no
Impurity injector: no
ICRF: no
LH: yes
DNB: yes
Cryopump: yes
------------------------------------------------------------------------------
Run plan: Start with 1101019014, with no DNB injection for the first few
shots. Then repeat with DNB timings as specified in the session
leader's run plan.
|
| Session Leader Summaries |
| Entered: Nov 5 2010 05:32:50:227PM |
| Author: Syunichi Shiraiwa |
| SL Summary 1101104***
Good run day with stable LH power coupled to plasmas and many good DNB pulses. After shots 7, locked modes tend to occur and are difficult to avoid. We tried 1) to eliminate the spike of plasma current at the beginning, 2) to start from slightly higher density, but both did not work in a reproducible manner. We went through stap1 to step 3 and obtained a nice set of almost identical discharges having a different DNB fire timings which allows (probably) to derive more time-resolved pitch angle evolution. Step 4 is left for future. Following is the table which summarize DNB, instability during LH, locked mode before LH.... No power shot : 19 After shot 15, we reduced the plasma current from 530kA to 470kA. No Locked mode 1, 2, 3, 4, 6, 7, 11, 12, 16, 18, 23, 27, 28 Instability during LH 4, 8, 9, 10, 12, 13, 14, 15(weak?), 17(weak), 20, 21, 22, 24, 25, 30, 31 good DNB 5, 6, 7, 9, 10, 11, 13, 14, 15, 20, 21, 23, 24, 25, 26, 27, 28, 30, 31 No Locked mode, no instability and good DNB : 7, 11, 18, 23, 27(LSN), 28(but unusual start-up) |
| Physics Operator Summaries |
| Session Leader Comments | |||
| Nov 4 2010 09:14:01:647AM | 1101104001 | Syunichi Shiraiwa | Good shot, LH trips around 1s. Density is a little higher than the request.
Next: repeat same shot for |
| Nov 4 2010 09:20:28:130AM | 1101104002 | Syunichi Shiraiwa | Good shot. Density is kept control as requested. No LH trip. Vloop~0.1
Next: increase LH power (160kW each to 170kW each) |
| Nov 4 2010 09:45:51:443AM | 1101104003 | Syunichi Shiraiwa | Good shot.
Next: increase LH power (170kW each to 180kW each), lower the density request (from 3 to 2.7) |
| Nov 4 2010 09:58:58:200AM | 1101104004 | Syunichi Shiraiwa | Good shot. We will move to step 2.
Next: increase outer gap by 7mm (RCUR 3.5mm) and DNB on |
| Nov 4 2010 10:19:15:673AM | 1101104006 | Syunichi Shiraiwa | Excellent. Density is identical with the target shot including the bumps and wiggle....
Next: Repeat |
| Nov 4 2010 11:00:48:020AM | 1101104008 | Syunichi Shiraiwa | Everything is good except for loop voltage. Magnetics shows a mode around 50kHz.
|
| Nov 4 2010 11:32:47:483AM | 1101104011 | Syunichi Shiraiwa | Good shot.
The plasma current at the beginning (100 - 200ms) is reduced. |
| Nov 4 2010 11:52:40:600AM | 1101104012 | Syunichi Shiraiwa | Locked again.
Next: Turn on Ip control in the segment one... |
| Nov 4 2010 12:17:54:950PM | 1101104014 | Syunichi Shiraiwa | Locked again.
Next: Turn on Ip control in the segment one... |
| Nov 4 2010 12:34:28:920PM | 1101104015 | Syunichi Shiraiwa | We reduced IP to 450kA. Good shot, flat zero loop voltage.
Next: Take set two of DNB pulse |
| Nov 4 2010 12:55:19:830PM | 1101104015 | Syunichi Shiraiwa | We reduced IP to 450kA. Good shot, flat zero loop voltage, but still mode is locked
Next: Take set two of DNB pulse |
| Nov 4 2010 12:55:31:727PM | 1101104016 | Syunichi Shiraiwa | No locked mode
|
| Nov 4 2010 01:33:35:927PM | 1101104018 | Syunichi Shiraiwa | No locked mode, Good DNB
Next: going to DNB pulse set A |
| Nov 4 2010 01:33:53:760PM | 1101104019 | Syunichi Shiraiwa | No power shot.
|
| Nov 4 2010 02:27:34:247PM | 1101104023 | Syunichi Shiraiwa | Good no-locked mode plasma for DNB CASE A.
Next: CASE B |
| Nov 4 2010 02:59:25:517PM | 1101104025 | Syunichi Shiraiwa | Locked
Next : move to step 3: repeat of 1101028006 LSN zero loop voltage. |
| Nov 4 2010 03:18:13:627PM | 1101104026 | Syunichi Shiraiwa | Good shot. Locked? during LH.
Next : Reduce Ip by 50kA and increase outer gap by 4mm. |
| Nov 4 2010 03:48:41:993PM | 1101104028 | Syunichi Shiraiwa | Injection at the beginning, but w/o locked mode. LH looks okey. Vloop ~ 0.15V
Next : PLH increase by 50kW. |
| Nov 4 2010 03:52:57:670PM | 1101104029 | Syunichi Shiraiwa | No EF3
Next : Repeat |
| Nov 4 2010 04:22:40:217PM | 1101104031 | Syunichi Shiraiwa | Pulse length is extended to get OH reference after LH.
Next : Next, we move on step 4. Ip 800kA, No LH, extend the NBI off time, and increase the density to 5e19 |
| Nov 4 2010 04:38:02:450PM | 1101104032 | Syunichi Shiraiwa | Shot is made as requested, but MSE signal to noise got worse.....??
Next : |
| Nov 4 2010 04:51:53:050PM | 1101104033 | Syunichi Shiraiwa | Shot is made as requested, but MSE signal to noise got worse.....??
Next : Last shot 700kA , nl_04 4e19m-2 |
| Nov 4 2010 05:03:44:700PM | 1101104034 | Syunichi Shiraiwa | No DNB
Next : repeat. last shot |
| Nov 4 2010 05:13:52:980PM | 1101104035 | Syunichi Shiraiwa | Injection around 0.4 s. Last shot. |
| Physics Operator Comments | |||
| Nov 4 2010 12:30:05:857AM | Robert Granetz | For shot 1, load DPCS seg 2 from seg 2 of 1101019014, but load seg 1 from shot 3 on that day (the first plasma shot). That shot had a pre-fill of 50 ms, whereas shot 14 had a 45 ms prefill. For the first plasma of the day, I'd rather have the longer pre-fill, and then maybe shorten it after the first few shots. | |
| Nov 4 2010 10:02:36:447AM | 1101104001 | Robert Granetz |
Shot 01 -- Plasma, full length. 0.5 MA, 5.4 T, 0.4e20 m-2, USN, cryopump. P_LH=0.6-0.7 MW.
As requested, there was no DNB.
JT just told me that the NINJA puffed at about t=1 s, inadvertently.
Next shot: decrease pre-fill a few ms, and flatten early density programming. The
NINJA has been disabled.
|
| Nov 4 2010 09:27:32:450AM | 1101104002 | Robert Granetz |
Shot 02 -- Plasma, full length. 0.5 MA, 5.4 T, 0.3e20 m-2, USN, cryopump. P_LH=0.7 MW.
Density is down nicely, now that the NINJA is off. HXR rises sharply as soon
as the LH turns off at t=1.4 s. MSE got background light, but there was no
Thomson data, so we'll need to redo this shot.
Next shot: repeat, no DPCS changes; higher P_LH; Thomson on
|
| Nov 4 2010 09:49:13:957AM | 1101104003 | Robert Granetz |
Shot 03 -- Plasma, full length. 0.5 MA, 5.4 T, 0.3e20 m-2, USN, cryopump. P_LH=0.74 MW.
Got Thomson data. Got MSE background data.
Next shot: reduce nl_04 to 0.27e20 m-2; reduce argon pulse to 50 ms (from 75 ms)
|
| Nov 4 2010 09:58:32:493AM | 1101104004 | Robert Granetz |
Shot 04 -- Plasma, full length. 0.5 MA, 5.4 T, +0.29e20 m-2, USN, cryopump. P_LH=0.78 MW.
These shots are still for MSE to get background (i.e. no DNB yet).
Next shot: move RCUR in by 3.5 mm (increase outer gap by 7 mm); turn on DNB
|
| Nov 4 2010 10:09:51:067AM | 1101104005 | Robert Granetz |
Shot 05 -- Plasma, full length. 0.5 MA, 5.4 T, 0.3e20 m-2, USN, cryopump, P_LH=0.8 MW.
DNB fired, and had some faulting. Good outer gap.
Next shot: no DPCS changes
|
| Nov 4 2010 10:24:12:763AM | 1101104006 | Robert Granetz | Shot 06 -- Plasma, full length. 0.5 MA, 5.4 T, +0.3e20 m-2, USN, cryopump, P_LH=0.85 MW. Next shot: increase prefill by +2 ms; move RCUR in by 1.5 mm after t=1 s. |
| Nov 4 2010 10:47:52:953AM | 1101104007 | Robert Granetz |
Shot 07 -- Plasma, full length. 0.5 MA, 5.4 T, 0.3e20 m-2, USN, cryopump, P_LH=0.85 MW.
Outer gap is held constant throughout the entire LH pulse.
Next shot: repeat, no DPCS changes; increase DNB pulse length
|
| Nov 4 2010 10:49:21:623AM | 1101104008 | Robert Granetz |
Shot 08 -- Plasma, full length. 0.5 MA, 5.4 T, 0.3e20 m-2, USN, cryopump, P_LH=0.90 MW.
DNB faulted alot.
Next shot: repeat for better DNB pulse
|
| Nov 4 2010 11:04:04:970AM | 1101104009 | Robert Granetz | Shot 09 -- Plasma, full length. 0.5 MA, 5.4 T, 0.3e20 m-2, USN, cryopump, P_LH=0.90 MW. Next shot: increase argon pulse to 75 ms (from 50 ms) |
| Nov 4 2010 11:24:06:510AM | 1101104010 | Robert Granetz |
Shot 10 -- Plasma, full length. 0.5 MA, 5.4 T, 0.3e20 m-2, USN, cryopump, P_LH=0.9 MW.
Good DNB performance.
Next shot: tweak Ip proportional gain to try to remove early Ip overshoot
|
| Nov 4 2010 11:43:21:413AM | 1101104011 | Robert Granetz |
Shot 11 -- Plasma, full length. 0.5 MA, 5.4 T, 0.3e20 m-2, USN, cryopump, P_LH=0.86 MW.
Better early control of Ip.
Next shot: change DNB modulation
|
| Nov 4 2010 11:49:30:820AM | 1101104012 | Robert Granetz |
Shot 12 -- Plasma, full length. 0.5 MA, 5.4 T, 0.3e20 m-2, USN, cryopump, P_LH=0.90 MW.
Next shot: activate Ip control in seg 1. (Load Ip seg 2 into seg 1, and have proportional gain
of 4.0 start at t=0.05 s.
|
| Nov 4 2010 12:06:25:767PM | 1101104013 | Robert Granetz |
Shot 13 -- Plasma, full length. 0.5 MA, 5.4 T, 0.3e20 m-2, USN, cryopump, P_LH=0.89 MW.
Good beam pulse. Still getting a locked mode.
Next shot: Tweak Ip gain in seg 1.
|
| Nov 4 2010 12:20:34:040PM | 1101104014 | Robert Granetz |
Shot 14 -- Plasma, full length. 0.5 MA, 5.4 T, 0.3e20 m-2, USN, cryopump, P_LH=0.93 MW.
Seg 1 Ip control doesn't seem to be doing much. Still get a locked mode.
Next shot: reduce Ip to 0.45 MA
|
| Nov 4 2010 12:37:42:997PM | 1101104015 | Robert Granetz |
Shot 15 -- Plasma, full length. 0.46 MA, 5.4 T, 0.3e20 m-2, USN, cryopump, P_LH=0.89 MW.
Good DNB. Maybe no locked mode.
Next shot: repeat, no DPCS changes; change beam timing
|
| Nov 4 2010 12:50:41:210PM | 1101104016 | Robert Granetz |
Shot 16 -- Plasma, full length. 0.46 MA, 5.4 T, 0.3e20 m-2, USN, cryopump, P_LH=0.90 MW.
Beam didn't fire.
Next shot: repeat for DNB
|
| Nov 4 2010 01:04:37:647PM | 1101104017 | Robert Granetz |
Shot 17 -- Plasma, full length. 0.46 MA, 5.4 T, 0.3e20 m-2, USN, cryopump, P_LH=0.90 MW.
Beam fired, but had some faulting early on.
Next shot: repeat, again for beam
|
| Nov 4 2010 01:25:44:357PM | 1101104018 | Robert Granetz |
Shot 18 -- Plasma, full length. 0.46 MA, 5.4 T, 0.3e20 m-2, USN, cryopump, P_LH=0.89 MW.
Good beam performance.
Next shot: no DPCS changes
|
| Nov 4 2010 01:31:54:230PM | 1101104019 | Robert Granetz |
Shot 19 -- No-power shot due to a camac init problem.
Next shot: back to plasma operation
|
| Nov 4 2010 01:48:47:650PM | 1101104020 | Robert Granetz |
Shot 20 -- Plasma, full length. 0.46 MA, 5.4 T, 0.3e20 m-2, USN, cryopump, P_LH=0.90 MW.
Good beam performance.
Next shot: repeat, no changes
|
| Nov 4 2010 01:50:39:043PM | 1101104020 | Robert Granetz | Earl will takeover as physics operator after shot 20. |
| Nov 4 2010 02:01:59:310PM | 1101104021 | Earl Marmar | Plasma, full length
startup ok some complaints about locked modes |
| Nov 4 2010 02:20:38:093PM | 1101104022 | Earl Marmar | increase nl_04 derivative gain (to 4.5 from 3)
plasma, ~ full length still have early density dip V_loop around 20 mV counter-current for duration of LH |
| Nov 4 2010 02:27:56:097PM | 1101104023 | Earl Marmar | increase nl_04 target between .2 and .3 seconds
add preprogrammed voltage to PG3 at the same time plasma, ~full length better early density evolution apparently no locked mode |
| Nov 4 2010 02:48:31:083PM | 1101104024 | Earl Marmar | no dpcs changes
plasma, ~full length slightly lower density in the early dip looks like this one locked |
| Nov 4 2010 03:01:41:027PM | 1101104025 | Earl Marmar | add a little more gas early in segment 2
plasma, ~full length better density, but still appears to lock (around 0.5 s) |
| Nov 4 2010 03:26:47:427PM | 1101104026 | Earl Marmar | load from 1101028006, LSN
import segment 1 from 1101104025 into segment 1 plasma, full length |
| Nov 4 2010 03:26:32:930PM | 1101104027 | Earl Marmar | decrease RCUR by 0.002 m
decrease Ip target to 500 kA (from 550) plasma, full length |
| Nov 4 2010 03:44:17:450PM | 1101104028 | Earl Marmar | increase nl_04 target to 3e19
plasma, ~full length some early injections nearly killed it, but the phoenix rose from the ashes |
| Nov 4 2010 03:53:15:843PM | 1101104029 | Earl Marmar | no dpcs changes
power supply dud no EF3 current |
| Nov 4 2010 04:16:34:513PM | 1101104030 | Earl Marmar | Ip target to 450 kA
plasma, full length |
| Nov 4 2010 04:29:02:747PM | 1101104031 | Earl Marmar | extend flattop to 1.7 s
plasma, made it past flat-top |
| Nov 4 2010 04:32:09:310PM | 1101104032 | Earl Marmar | nl_04 target to 5e19
Ip to 800 kA plasma, disrupt just after start of ramp-down |
| Nov 4 2010 04:52:42:010PM | 1101104033 | Earl Marmar | no dpcs changes
plasma, disrupt right after end of flat-top |
| Nov 4 2010 05:04:06:480PM | 1101104034 | Earl Marmar | nl_04 target to 4e19
Ip to 700 kA plasma, nearly full length no DNB |
| Nov 4 2010 05:14:51:017PM | 1101104035 | Earl Marmar | no dpcs changes
plasma early disrupt, mega-injection at .355 s |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:59:21:810AM | Plasma | Ok | |
| 2 | 09:11:57:930AM | Plasma | Ok | |
| 3 | 09:35:27:110AM | Plasma | Ok | |
| 4 | 09:48:02:647AM | Plasma | Ok | |
| 5 | 10:00:42:190AM | Plasma | Ok | |
| 6 | 10:14:01:583AM | Plasma | Ok | |
| 7 | 10:27:37:990AM | Plasma | Ok | |
| 8 | 10:44:09:397AM | Plasma | Ok | |
| 9 | 10:57:52:440AM | Plasma | Ok | |
| 10 | 11:13:19:863AM | Plasma | Ok | |
| 11 | 11:27:34:657AM | Plasma | Ok | |
| 12 | 11:43:45:863AM | Plasma | Ok | |
| 13 | 11:58:04:837AM | Plasma | Ok | |
| 14 | 12:13:23:553PM | Plasma | Ok | |
| 15 | 12:28:53:413PM | Plasma | Ok | |
| 16 | 12:43:34:020PM | Plasma | Ok | |
| 17 | 12:58:49:443PM | Plasma | Ok | |
| 18 | 01:13:27:153PM | Plasma | Ok | |
| 19 | 01:31:08:153PM | Plasma | Bad | No Power due to camac problem |
| 20 | 01:39:31:277PM | Plasma | Ok | |
| 21 | 01:55:34:283PM | Plasma | Ok | |
| 22 | 02:08:14:470PM | Plasma | Ok | |
| 23 | 02:21:03:400PM | Plasma | Ok | |
| 24 | 02:42:13:330PM | Plasma | Ok | |
| 25 | 02:54:39:277PM | Plasma | Ok | |
| 26 | 03:07:14:700PM | Plasma | Ok | |
| 27 | 03:20:23:403PM | Plasma | Ok | |
| 28 | 03:34:45:660PM | Plasma | Ok | |
| 29 | 03:49:55:960PM | Plasma | Bad | EF3 Supply Didn't Fire |
| 30 | 04:02:23:240PM | Plasma | Ok | |
| 31 | 04:16:28:550PM | Plasma | Ok | |
| 32 | 04:29:02:903PM | Plasma | Ok | |
| 33 | 04:42:15:863PM | Plasma | Ok | |
| 34 | 04:56:07:550PM | Plasma | Ok | |
| 35 | 05:09:57:890PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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