| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | John Liptac,Robert Granetz |
| Physics operator(s): | Jim Irby |
| Engineering operator(s): | Andy Pfeiffer,Bill Byford,Bill Parkin |
| Engineering Operator Run Comment |
| MP #439 -- Scaling of gas jet induced disruption timing with q95 Session |
| Session Leader Plans |
| Entered: Mar 7 2006 04:17:46:710PM |
| Author: Valerie Izzo |
| MP #439 -- Scaling of gas jet induced disruption timing with q95
Session leaders: V. Izzo, R. Granetz, D. Whyte Physics operator: J. Irby ECDC overnight and bake at 60 C. Run begins at 09:00 and ends at 17:00. Power systems as on 1050825017 (1.0 MA, 5.4 T, SNL fiducial) A-coil configuration: normal [+Dtop -Dbot -Jtop +Jbot] and enabled. Gas Setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar + 2 psi Ne Hybrid DISABLED (PG1) leave B-side upper with whatever Hybrid disabled fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) No NINJA for this run. Gas jet has been set up with argon at 70 bar. WE MAY WANT TO SWITCH THE GAS TO KRYPTON SOMETIME DURING THE DAY. Torvac setup: unnecessary diagnostic gate valves (ECE) should be kept closed on all gas jet shots. Enable the following, assuming no vacuum problems: Z-bolo shutters, VUV (yes, enable the VUV gate valve) Necessary diagnostics: IR camera, if possible Fast PSI camera on B-horizontal, if possible, starting at t=0.800 s, Ar+0 filter Thomson scattering, with timing set so that one profile is obtained just after the edge Te collapses Bolometry AXUV array with reduced gain Halo current Rogowskis SX arrays with fast sampling window (t=0.795 to 0.820 s) Mirnov Bp fluctuations ------------------------------------------------------------------------------- ICRF Setup: No RF -- ohmic only ------------------------------------------------------------------------------- Run plan: Start at 5.4 T and increment Btor on each subsequent shot, noting the time between the gas pulse and the thermal quench. Requested values are 5.4, 5.8, 6.3, 6.7, and possibly 7.2 and 7.6 T. Then go back to 5.4 T and decrement the field on each subsequent shot (5.4, 4.5, 4.1). |
| Physics Operators Plans |
| Entered: Mar 7 2006 05:28:01:960PM |
| Author: Jim Irby |
| Only addition to SL_plan is:
Backporch will be added to TF. |
| Session Leader Summaries |
| Entered: Mar 8 2006 06:04:36:110PM |
| Author: Robert Granetz |
Session leader summary for Wednesday 08 Mar 2006
MP 439: Scaling of gas jet induced disruption timing with q95
Session leaders: V. Izzo, R. Granetz, D. Whyte
Physics operator: J. Irby
We essentially got enough of the experiment done to conclude that there
wasn't any consistent effect of the timing of the thermal quench as the
toroidal field was raised from 5.4 to 7.1 T for ohmic plasmas at
nl_04=0.8-1.0. Relevant shots are: 1060308007, 12, 15, 17, 19, and 22.
After puzzling about this, we decided to try a quick field
scan at a lower density, since ohmic plasmas at the original density might
have had such cold edges that the NIMROD modeling wasn't really valid. So
we had three shots with nl_04=0.3e20 m-2, and these showed a possible,
dependence on B-field of about the right time variation. However, on the
last shot the plasma fueling valve failed completely, and so it was a very
low density runaway shot. So it may be invalid. The three shots are:
1060308024 7.1 T t_spike = 0.80675 s
1060308026 5.4 T t_spike = 0.80645 s
1060308028 4.4 T t_spike = 0.80625 s
Small bursts of hard x-rays were observed on some shots, and this bears
further study.
There were many operational difficulties today. The main fueling valve
("C-side") was not doing a good job of following its command, and it
completely failed to open by the end of the day. (It will be replaced
before tomorrow's run.) And we also had many post-disruption fizzles,
which is notably uncharacteristic of previous gas jet runs. The RGA showed
lots of hydrocarbons. This may be because we're still only very early into
the campaign.
|
| Physics Operator Summaries |
| Entered: Mar 8 2006 05:23:23:517PM |
| Author: Jim Irby |
| MP #439 -- Scaling of gas jet induced disruption timing with q95
Session leaders: V. Izzo, R. Granetz, D. Whyte Physics operator: J. Irby EOs: Pfeiffer, Byford, Parkin Lots of fizzles today. This problem was probably a combination of a dirty machine responding to the disruptions and the prefill being too high. Problems today: Fill pressure was probably too high much of the day, which may have increased the fizzle rate. There was some thought yesterday that the gauge calibration was incorrect, but the calibration is in fact correct. The B-Main piezo valve (PG3) was "stuck" closed until 0.5 s or so, and we therefore were w/o density control during most of the shot. This problem should be fixed by tomorrow's run. The valve failed completely on shot 28. The machine was pretty dirty with lots of carbon being evolved from the disruptions. The carbon level was probably the primary reason for the high fizzle rate. |
| Session Leader Comments | |||
| Mar 8 2006 08:04:40:310AM | Robert Granetz | Filling gas jet plenum with 70 bar of argon. Fast valve is sealed. The rest of the system is at 0.2 mTorr. | |
| Mar 8 2006 08:12:31:390AM | Robert Granetz | CXRS toroidal background shutter (upper push-pull pair) is now open, and will remain open for today's run so that Aaron can get some spectra. | |
| Mar 8 2006 08:13:27:937AM | Robert Granetz | The first plasma shot will be a non-disruptive shot for John Liptac and Ron Parker to complete yesterday's run. After that, it's no holds barred. | |
| Mar 8 2006 09:55:18:763AM | 1060308004 | Robert Granetz | All the programmable amplifiers for all the core x-ray arrays are working. |
| Mar 8 2006 10:16:09:997AM | 1060308004 | John Liptac | Bob and Valerie have graciously given us the first shot of the day to complete the run from yesterday.
Gap scan, reload of shot 1060307019 with 60 degree ideal CD phase for six segments. 20kW/klystron to match yesterdays run. LH set to go at 0.695 s. Network problem broke connection to alcdata no LH power. Gas valve issue, rise that was seen at about 0.85 s yesterday was seen at about 0.6 s, before the LH power. nl04 goes up to 0.6 as opposed to 0.4 range, the antenna probe density goes from 4-2e18 m-3 over the gap scan, not a bad range, but different than yesterday's 2-1e18 m-3. |
| Mar 8 2006 09:57:34:903AM | 1060308005 | John Liptac | Fizzle, continue with Bob's run. Try to pick up scan on next LH run.
Move launcher back to 1700 counts, ~ 1cm behind limiter, to protect is from disruptions. |
| Mar 8 2006 09:56:16:890AM | 1060308006 | Robert Granetz | Gas jet run will begin on this shot. I've turned on the fast valve trigger node, and enabled the torus valve. |
| Mar 8 2006 10:22:59:950AM | 1060308006 | Robert Granetz | Shot 06 -- Fizzle. Argon gas jet fired at t=0.800 s. Plenum gas: argon Pulse length (ms): 2.0 Plenum pre -pulse pressure (bar): 70 Plenum post-pulse pressure (bar): 66 Plenum change in pressure (bar): 04 |
| Mar 8 2006 10:57:09:233AM | 1060308007 | Valerie Izzo |
Btor=5.4 T, q95=3.7, Thermal quench at t=0.8065 s. A little later than previous argon gas jet shots at this toroidal field. Repeat with same Btor to adjust Thomson timing. |
| Mar 8 2006 10:58:03:123AM | 1060308007 | Robert Granetz | X-ray arrays didn't look the same as what I'm used to seeing. Might be because these are only ohmic shots (60 kJ), with low x-ray emission in the periphery. |
| Mar 8 2006 11:18:22:420AM | 1060308009 | Robert Granetz | Fizzle. Gas jet fired. |
| Mar 8 2006 11:48:33:467AM | 1060308010 | Robert Granetz | For this shot, I've changed the magnetics sampling rate to 10 kHz for t = -0.1 to +0.9 s (since the plasma will terminate at t=0.81 s). This keeps the number of samples the same. |
| Mar 8 2006 12:26:52:263PM | 1060308012 | Valerie Izzo |
Btor=5.4 T, q95=3.7. Thermal quench at 0.806 s. Thomson was a little too late this time. Next shot, increase to Btor=5.8 T |
| Mar 8 2006 12:29:20:607PM | 1060308012 | Robert Granetz | The x-ray data looks more like what I would expect, although I think it's still evident that there's less emission from the periphery compared to RF-heated shots. |
| Mar 8 2006 12:33:48:873PM | 1060308012 | Robert Granetz | Shot 12 -- Good shot. Argon gas jet fired at t=0.800 s. Btor = 5.4 T. Current quench starts at t=0.8064 s. Current quench duration is about 1.5 ms. I_halo=116 kA. Prf=0.0 MW (ohmic) Wth=55 kJ. Plenum gas: argon Pulse length (ms): 2.0 Plenum pre -pulse pressure (bar): 70 Plenum post-pulse pressure (bar): 66 Plenum change in pressure (bar): 04 |
| Mar 8 2006 12:31:43:983PM | 1060308013 | Robert Granetz | The toroidal field will be 5.8 T for this shot. |
| Mar 8 2006 01:13:56:543PM | 1060308015 | Robert Granetz | Shot 15 -- Good shot. Argon gas jet fired at t=0.800 s. Btor = 5.8 T. Current quench starts at t=0.8064 s. Current quench duration is about 1.3 ms. I_halo=120 kA. Prf=0.0 MW (ohmic) Wth=56 kJ. Plenum gas: argon Pulse length (ms): 2.0 Plenum pre -pulse pressure (bar): 70 Plenum post-pulse pressure (bar): 66 Plenum change in pressure (bar): 04 |
| Mar 8 2006 01:16:05:700PM | 1060308015 | Robert Granetz | X-ray data during the quench looks bizarre! |
| Mar 8 2006 01:21:56:717PM | 1060308015 | Valerie Izzo | Btor=5.8 T, q95=3.9. Thermal quench at 0.8062 s. Little or no apparent change in quench timing. Thomson shows cooling in as far as rho=0.6 at .806 s. |
| Mar 8 2006 01:28:57:780PM | 1060308015 | Robert Granetz | Next shot will be at 6.3 T. |
| Mar 8 2006 01:50:14:327PM | 1060308017 | Robert Granetz | Shot 17 -- Good shot. Argon gas jet fired at t=0.800 s. Btor = 6.3 T. Current quench starts at t=0.8065 s. Current quench duration is about 1.3 ms. I_halo=111 kA. Prf=0.0 MW (ohmic) Wth=107 kJ. Plenum gas: argon Pulse length (ms): 2.0 Plenum pre -pulse pressure (bar): 70 Plenum post-pulse pressure (bar): 66 Plenum change in pressure (bar): 04 |
| Mar 8 2006 01:54:09:623PM | 1060308017 | Robert Granetz | The x-ray plunge occurs at about 0.8062 s, which is about 200 microseconds later than on shot 12 (at 5.4 T). |
| Mar 8 2006 02:04:17:110PM | 1060308017 | Valerie Izzo | Btor=6.3 T, q95=4.3. No change in timing is apparent.
|
| Mar 8 2006 02:21:20:483PM | 1060308019 | Robert Granetz | Shot 19 -- Good shot. Argon gas jet fired at t=0.800 s. Btor = 6.7 T. Current quench starts at t=0.8066 s. Current quench duration is about 1.5 ms. I_halo=111 kA. Prf=0.0 MW (ohmic) Wth=61 kJ. Plenum gas: argon Pulse length (ms): 2.0 Plenum pre -pulse pressure (bar): 65 Plenum post-pulse pressure (bar): 61 Plenum change in pressure (bar): 04 |
| Mar 8 2006 02:26:03:687PM | 1060308019 | Valerie Izzo | Btor=6.7 T, q95=4.4. Thermal quench at about 0.8065 s. Thomson show cooling extends only to rho=0.7 at 0.806 s. Thermal quench and current quench may be getting progressively later, but by a very small amount which may not be outside the error bars. |
| Mar 8 2006 02:29:39:827PM | 1060308019 | Robert Granetz | X-rays didn't behave the same as the last few shots, so it's difficult to compare timing. |
| Mar 8 2006 02:29:53:030PM | 1060308019 | Robert Granetz | Next shot will be 7.2 T. |
| Mar 8 2006 03:09:07:857PM | 1060308022 | Robert Granetz | Shot 22 -- Good shot. Argon gas jet fired at t=0.800 s. Btor = 7.1 T. Current quench starts at t=0.8065 s. Current quench duration is about 1.8 ms. I_halo=116 kA. Prf=0.0 MW (ohmic) Wth=50 kJ. Plenum gas: argon Pulse length (ms): 2.0 Plenum pre -pulse pressure (bar): 70 Plenum post-pulse pressure (bar): 66 Plenum change in pressure (bar): 04 |
| Mar 8 2006 03:14:55:060PM | 1060308022 | Valerie Izzo | Btor=7.1T, q95=4.6. Thermal quench at 0.8063 s. Thomson shows more cooling by 0.806 s than lower field shots. |
| Mar 8 2006 04:06:47:267PM | 1060308024 | Robert Granetz | Shot 24 -- Good shot. Argon gas jet fired at t=0.800 s. Btor = 7.1 T. Note that this shot had nl_04=0.3e20 m-2, instead of 0.9e20 m-2. Current quench starts at t=0.8067s. Current quench duration is about 1.5 ms. I_halo=99 kA. Prf=0.0 MW (ohmic) Wth=42 kJ. Plenum gas: argon Pulse length (ms): 2.0 Plenum pre -pulse pressure (bar): 70 Plenum post-pulse pressure (bar): 66 Plenum change in pressure (bar): 04 |
| Mar 8 2006 04:11:08:020PM | 1060308024 | Robert Granetz | X-ray arrays still don't provide a clear thermal quench time. |
| Mar 8 2006 04:18:18:567PM | 1060308024 | Robert Granetz | For this shot, and the remainder of today, the density programming was reduced to nl_04=0.5e20 m-2, instead of 1.0e20 m-2 (which was the request for all earlier shots today). |
| Mar 8 2006 04:18:44:127PM | 1060308024 | Robert Granetz | The next shot will be at 5.4 T, with nl_04=0.5e20 m-2. |
| Mar 8 2006 04:45:06:380PM | 1060308026 | Robert Granetz | Shot 26 -- Good shot. Argon gas jet fired at t=0.800 s. Btor = 5.4 T. nl_04=0.3e20 m-2 Current quench starts at t=0.80645 s. Current quench duration is about 1.6 ms. I_halo=124 kA. Prf=0.0 MW (ohmic) Wth=38 kJ. Plenum gas: argon Pulse length (ms): 2.0 Plenum pre -pulse pressure (bar): 70 Plenum post-pulse pressure (bar): 66 Plenum change in pressure (bar): 04 |
| Mar 8 2006 04:45:24:440PM | 1060308026 | Robert Granetz | Next shot will be at 4.0 T, and nl_04=0.5e20 m-2. |
| Mar 8 2006 05:00:13:610PM | 1060308027 | Robert Granetz | This shot disrupted, but it wasn't us. The disruption was at t=0.7 s. Maybe it was a low-q issue (q95=2.8), maybe something else. For the next shot, increase Btor a bit to 4.3 T. This will be the last shot of the day. |
| Mar 8 2006 05:17:33:753PM | 1060308028 | Robert Granetz | Shot -- Good shot, except the density seemed to go to zero, and there were lots of runaways. Argon gas jet fired at t=0.800 s. Btor = 4.4 T. Current quench starts at t=0.8062 s. Current quench duration is about 1.7 ms. I_halo=171 kA. Prf=0.0 MW (ohmic) Wth=23 kJ. Plenum gas: argon Pulse length (ms): 2.0 Plenum pre -pulse pressure (bar): 70 Plenum post-pulse pressure (bar): 66 Plenum change in pressure (bar): 04 |
| Mar 8 2006 05:19:04:160PM | 1060308028 | Robert Granetz | End of run. I'll pump out the gas jet system, and also close the CXRS shutter, write up a short run report, and then start setting up for physopping tomorrow's run. |
| Physics Operator Comments | |||
| Mar 8 2006 08:04:44:827AM | Jim Irby | Before the run we will take a test shot to:
. check operation of the data system . verify proper operation of the main gas puff . obtain a TF scanner baseline | |
| Mar 8 2006 09:09:29:857AM | 1060308001 | Jim Irby | This shot is a cycle test
test: . data system including bolometer camac . gas puff . bolometer camac lost some x-tomo data don't really have gas puff from b-side until 0.5 s ratiomatic was off bolometer camac opeational |
| Mar 8 2006 09:09:00:373AM | 1060308002 | Jim Irby | second try on gas puff --- started a little earlier 0.31 s
ratiomatic was on for this one |
| Mar 8 2006 09:20:39:747AM | 1060308003 | Jim Irby | another cycle test
a little earlier on the gas 0.285 s |
| Mar 8 2006 09:49:29:293AM | 1060308004 | Jim Irby | This will be a repeat of shot 1060307019 for completion of LH run
removed 40 volt kick to PG3 in seg 2 in attempt to get density from yesterday good shot density too high for John. |
| Mar 8 2006 09:56:56:090AM | 1060308005 | Jim Irby | dropped density request to 4.6e19 /m^2 as seen on 1060307019 at 0.7 s
fizzle |
| Mar 8 2006 10:28:42:310AM | 1060308006 | Jim Irby | loaded shot 1050825017, 5.4 T, 1 MA, LSN
loaded seg 1 from 1060307019 into seg 1 did calls on rcur, zcur,clearin,rxl,zsl,rxu,zxu, and IP to resolve new procedures loaded seg 1 tf with backporch into seg 2. Bob has enabled gas jet fizzle --- possible issues with both gas and bz0 |
| Mar 8 2006 10:46:16:293AM | 1060308007 | Jim Irby | gas from 45 to 35 ms
bzo from -1340 to -1360 A plasma #49 high |
| Mar 8 2006 11:12:27:373AM | 1060308008 | Jim Irby | This shot will be a PLC controlled 150 kA TF only test
#49 bottom at 2.19 u at 1 s (no change from yesterday) |
| Mar 8 2006 12:01:32:857PM | 1060308010 | Jim Irby | working to get a backporch following disruption
TF invert to 2.8 s TF fizzle off Steve Wolfe has enabled seg 4 to control backporch after disruption A few extra minutes for Joe and Yuri to mod TF fizzle delay. TF fizzle from 1000 to 2500 ms EF4 from -1360 to -1380 A Bob has enabled gas jet again fizzle --- no problem with fields or gas but... got the backporch #49 okay at 2 s |
| Mar 8 2006 12:10:41:530PM | 1060308011 | Jim Irby | no dpcs changes
fizzle --- will drop gas for next shot #49 okay |
| Mar 8 2006 12:26:40:857PM | 1060308012 | Jim Irby | EF4 back to -1340 A from -1380 --- late breakdown from last shot
plasma --- actually reached programmed density after valve turned on |
| Mar 8 2006 12:48:04:733PM | 1060308013 | Jim Irby | Bt to 5.8 T --- 161 kA
fizzle #49 okay |
| Mar 8 2006 01:04:01:733PM | 1060308014 | Jim Irby | reduced pg4 from 30 to 28 ms.
closer but still fizzled pressure was lower as requested bounce at about 13 ms did us in |
| Mar 8 2006 01:21:26:513PM | 1060308015 | Jim Irby | ef4 to -1350 from -1340 A
plasma --- got higher field #49 2.88 u |
| Mar 8 2006 01:48:35:593PM | 1060308016 | Jim Irby | changing TFV cooling from C-Right control at -162 C to Vertical average control -184 C. TF bottom cooling to -180 C.
TF to 6.3 T (175 kA) TF current limit raised to 190 kA Fizzle #49 2.59 u fields look good --- gas? |
| Mar 8 2006 01:58:04:577PM | 1060308017 | Jim Irby | prefill from 28 to 27 ms.
plasma --- #49 2.75 u |
| Mar 8 2006 02:12:50:687PM | 1060308018 | Jim Irby | TF to 6.7 T (186 kA)
fizzle #49 at 2.58 u |
| Mar 8 2006 02:31:48:060PM | 1060308019 | Jim Irby | prefill to 28 from 27 ms
plasma #49 2.69 u |
| Mar 8 2006 02:46:22:060PM | 1060308020 | Jim Irby | TF to 7.2 T (200 kA)
TF current limit at 205 kA prefill from 27 to 26 ms dud --- supply problem with ef3 #49 at 2.42 u |
| Mar 8 2006 03:16:58:577PM | 1060308022 | Jim Irby | prefill to 23 ms --- Ian, after talking with Brian, is certain the ratiomatic calibration is correct, and we have been running very high fill pressures over the last couple of days.
plasma --- #49 at 2.73 u |
| Mar 8 2006 03:56:36:487PM | 1060308023 | Jim Irby | prefill from 23 to 21 ms
fizzle --- very late breakdown Br0 may be a little low #49 2.5 u |
| Mar 8 2006 04:17:45:283PM | 1060308024 | Jim Irby | Br0 increased by 0.3 mT
plasma --- looks good --- got .5 e20 |
| Mar 8 2006 04:30:17:470PM | 1060308025 | Jim Irby | Bt to 5.4 T
fizzle #49 2.58 u |
| Mar 8 2006 04:48:58:253PM | 1060308026 | Jim Irby | no dpcs changes
plasma |
| Mar 8 2006 04:55:10:847PM | 1060308027 | Jim Irby | Bt to 4.0 T (111 kA)
plasma #49 2.46 u |
| Mar 8 2006 05:22:11:033PM | 1060308028 | Jim Irby | Bt to 4.3 T (120 kA)
plasma --- very low density --- lots of x-rays looks like the piezo failed completely #49 at 2.49 u |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:48:00:310AM | Test | Ok | |
| 2 | 09:02:32:200AM | Test | Ok | |
| 3 | 09:14:38:607AM | Test | Ok | |
| 4 | 09:35:47:907AM | Plasma | Ok | TF top 43&51-4.8417,49-4.45 |
| 5 | 09:50:43:310AM | Plasma | Ok | TF top 42-6.9525, 49-5.27131 |
| 6 | 10:18:48:187AM | Plasma | Ok | TF top 42-6.15144, 48-4.89616 |
| 7 | 10:34:32:890AM | Plasma | Ok | TF Top 43 at 5.80435 uohms and bottom at 11.4771 uohms |
| 8 | 10:49:17:403AM | Plasma | Ok | |
| 9 | 11:14:36:153AM | Plasma | Ok | |
| 10 | 11:49:44:247AM | Plasma | Ok | |
| 11 | 12:03:06:420PM | Plasma | Ok | |
| 12 | 12:15:41:327PM | Plasma | Ok | |
| 13 | 12:40:40:467PM | Plasma | Ok | |
| 14 | 12:53:15:170PM | Plasma | Ok | |
| 15 | 01:07:36:297PM | Plasma | Ok | |
| 16 | 01:30:28:793PM | Plasma | Ok | |
| 17 | 01:44:24:373PM | Plasma | Ok | |
| 18 | 02:02:05:590PM | Plasma | Ok | |
| 19 | 02:14:41:327PM | Plasma | Ok | |
| 20 | 02:36:17:500PM | Plasma | Bad | EF3 Breaker Opened prior to Shot |
| 21 | 02:50:26:467PM | Plasma | Ok | |
| 22 | 03:03:08:390PM | Plasma | Ok | |
| 23 | 03:47:32:280PM | Plasma | Ok | |
| 24 | 04:00:30:627PM | Plasma | Ok | |
| 25 | 04:22:54:253PM | Plasma | Ok | |
| 26 | 04:35:39:910PM | Plasma | Ok | |
| 27 | 04:48:36:457PM | Plasma | Ok | |
| 28 | 05:03:27:457PM | Plasma | Ok | |