| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Yuichi Takase |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Joe Daigle,Vinny Bertolino |
| Engineering Operator Run Comment |
| 8T final run shutdown/granetz, takase |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:13:930PM |
| Author: To Be Determined |
| 950609 (last run of Phase II-B) MP #117 He3 minority heating at 8T Density scan Despite several problems encountered during the run, we were able to accomplish the objective of this run. On shots 11-13 Li pellet was injected prior to RF (pellet timing was changed to optimize the neutron rate and the stored energy), with successful results. W_EFIT=130kJ, Ti=3.6keV, and 8e13 neutrons/sec was achieved on shot 13 with Li pellet injection 15ms before RF turn-on. We also observed a clear H-mode transition at a record value of nebar*BT=23e20(m-3*T). For the last three shots, we attempted the low He3 concentration H-He3 mode conversion heating by switching to H majority and lowering the field to 7.3T (at this field the H fundamental resonance is out of the plasma, unlike at 6.5T). On shot 18 some electron heating was observed. Power deposition was probably not central (He3 concentration was probably too low). We need to reinvestigate this scenario in the fall. Shot 01 fiz 02 pl disrupt @ 0.76s (OH1 pulled out) shot delayed - computer problems, CRYO temp reading problem, etc. 03 pl 7.9T, 1MA, nel_04=1.1e20, E-port only, P_RF=1MW 04 pl nel_04=1.2e20, E-port only, P_RF=1.2MW 05 pl nel_04=1.1e20, D-port tripped, P_RF=2.3MW, W_EFIT=61-83kJ TF didn't get to flattop shot delayed - N2 leak 06 pl nel_04=0.9e20, D-port tripped, P_RF=1.1MW 07 pl nel_04=0.9e20, D-port tripped, P_RF=1.2MW going up in density, enable Li pellet @ 1.1s 08 pl nel_04=1.4->1.3e20, D-port tripped, P_RF=1.3MW, disrupt @ 0.93s disable D-port arc det from the cell (still have transmitter arc det) 09 pl nel_04=1.5->1.2e20, got both RF, P_RF=2.1MW 10 pl nel_04=1.6->1.4->1.5e20, got both RF, P_RF=2.3MW 11 pl PEP mode (Li pellet @ 0.75s), nel_04=3->1.3e20, P_RF=2.3MW W_EFIT=60->115kJ, Ti_HIREX=3.6keV, Te0=3keV (sawtooth suppressed) 6e13neuts/s, little H-mode @ 0.85s 12 pl PEP mode (Li pellet @ 0.74s), nel_04=2.7->1.3e20, P_RF=2.5MW W_EFIT=60->110kJ, Ti_HIREX=3.6keV, Te0=3keV (sawtooth suppressed) 6e13neuts/s (not as good) 13 pl PEP mode (Li pellet @ 0.76s), nel_04=3->1.3e20, P_RF=2.5MW W_EFIT=60->130kJ, Ti_HIREX=3.6keV, Te0=3keV (sawtooth suppressed) 8e13neuts/s, H-mode @ 0.825s ("ELM-free" @ 0.845s) 14 dud 15 pl nel_04=0.9e20, P_RF=2.1MW no spectroscopy data 7.3T H-He3 16 fiz 17 pl disrupt @ 0.58s, H/H+D=0.6->0.2 (CX) 18 pl nel_04=0.9e20, D-port tripped, P_RF=1.2->0.85MW some electron heating (not so great) |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:54:707PM |
| Author: To Be Determined |
| Physics Operator's summary for run 950609. MP #117 He3 minority heating at 7.9 T SL: Y. Takase PO: R. Granetz EO: V. Bertolino/J. Daigle This is a continuation of runs 950530 and 950531. Plasma operation will be diverted, lower x-point, in deuterium at 1 MA and 8 T, with He3 minority added for ICRF heating. The primary goal of today's run is to study RF heating over a range of densities. Summary: Successfully obtained data with Prf=2.3 MW at several densities in deuterium at 7.9 tesla and 1 MA (nl_04=0.8, 1.0, 1.3, 1.5e20 m-2). The last shot was in hydrogen at 7.3 tesla and nl_04=1.0e20 m=2. There were also many shots with lithium pellet injection. Even a brief H-mode (??) at 7.9 tesla and nl_04=1.5e20 !. The relatively low number of shots was primarily due to long cooldown times at the higher field, but there were also a fair number of problems as well: several DAQ failures, one OH1 fault, a leaky port seal, and several INIT failures. Nothing major though. This is the last run until autumn, due to the planned summer shutdown. Scorecard: 15 plasmas 2 fizzles (first D2 shot and first H2 shot) 1 dud, maybe (camac init failure) ---------- 18 total Run setup: Discharge clean as usual in deuterium before the run Fill A-side plenum with 19-20 psi of deuterium Fill B-side-upper plenum with 19-20 psi of Helium-3 (This plenum probably already contains Helium-3, so it may not need to be purged. This stuff is expensive, after all.) Set pre-fill at 1.8e-5 torr. Start from shot 950531010, (an 8 tesla, 1 MA shot). Adjust fizzle detector appropriately. Set TF inversion at 1.1 s. Set density to nl_04=1.0e20 m-2. Detailed shot log: Shot 01 -- Fizzle. Reasonably good null. Next shot: reduce pre-fill from 1.8 to 1.6e-5 torr. Shot 02 -- Plasma, but OH1 faulted around 0.36 s, causing plasma current to droop, and terminating shot at 0.76 s in a CENTERED disruption. Next shot: repeat. RF should start at 0.8 s. MAX (and it's camac highway) crashed during the init for shot 03. Long pause while MAX reboots. Fault occurred during the (second) init attempt. Long pause. Shot 03 -- Plasma, good shot. 1 MA, 8 T. Prf=1 MW, from t=0.77 to 1.00 s. Next shot: turn on FSP control, with the programmed location just about where it was on this shot at 0.6 s. Also move He3 gas pulse earlier by 0.1 s. Shot 04 -- Plasma, disrupted at 1.02 s due to excessive elongation (kappa=1.8). This problem was caused by the FSP control. Prf=1 MW. Next shot: raise FSP strike point by 8 mm. If this results in a problem, I'll disable it. Shot 05 -- Plasma, good shot. Prf=2.3 MW. Some heating, but not too impressive. Good control of FSP strike point. Toroidal field did not quite reach 7.9 T, and thus did not flattop. Probably due to an excessively warm TF core. Next shot: lower the requested density from 1.0 to 0.8e20 m-2. Nitrogen leak, probably on E-port seal. There will be a very long pause, since the TF core is warm, but the cooling had to be reduced to close up the leaking seal. Shot 06 -- Plasma, good shot. Lower density, as requested. Prf=1.1 MW. Next shot: Change RCUR control to include a tiny amount of feedback based on the RF antenna loading (after t=1.1 s). No other changes. Shot 07 -- Plasma, good shot, except for some hard x-rays. Next shot: raise pre-fill from 1.7 to 1.9e-5 torr, raise density to nl_04=1.3e20 m-2, and zero out the RCUR feedback on RF antenna loading. Also turn on lithium pellet injector at 1.1 s. Also, due to intense lobbying by Ian, who doesn't like the quality of the breakdown, I lowered Br by 0.5 mT and raised Bz by 1 mT for the next shot. Shot 08 -- Plasma, disrupted at 0.93 s. EF2's were at their current limit. Density was higher, as requested. Next shot: turn off FSP control (and the fast scanning probe) and try again. Shot 09 -- Plasma, good shot. Prf=2.0 MW. Lithium pellet at 1.1 s. Next shot: raise density to nl_04=1.5e20 m-2. Also turn on feedback of RCUR using the RF antenna loading, but with a very small coefficient again. Also, set up the impurity injector to shoot in niobium at 0.9 s. Shot 10 -- Plasma, good shot. Prf=2.3 MW. Lithium pellet at 1.1 s. Higher density, as requested. Next shot: repeat. Change RCUR feedback on antenna loading to turn on at 0.9 s, rather than 1.1 s, since it looks like it may be working properly. Shot 11 -- Plasma, good shot. Prf=2.3 MW. Big lithium pellet at 0.75 s causes a doubling of the density. There's some rumbling from the RF guys about a very short H-mode from 0.85 to 0.86 s, but I don't believe it. Next shot: repeat. Change sign of the coefficient of the antenna loading in the RCUR predictor. Shot 12 -- Plasma, good shot. Prf=2.4 MW. Another lithium pellet at 0.74 s. Next shot: repeat, except move lithium pellet injection to 0.76 s. Shot 13 -- Plasma, good shot. Prf=2.4 MW. Lithium pellet at 0.76 s. Next shot: lower the density to nl_04=0.8e20 m-2. Also re-enable FSP control, with the strike position raised by 5 mm from shot 08. Also increase the coefficient of the antenna loading feedback on RCUR from -200 to -400 after t=1.0 s. Alternator problem. Had to recycle back to recool. Shot 14 -- No plasma, or a fizzle. Can't tell because spectroscopy DAQ failed and all the magnetics DAQ failed. Lots of DAQ failures. Apparently there must have been init failures. Next shot: try again, no changes. Shot 15 -- Plasma, good shot. Prf=2.1 MW. No lithium pellet. No spectroscopy data again. It turns out that the spectroscopy model was locked, due to editing by Rob Nachtrieb. Next shot: change to hydrogen plasma, with a prefill of 2.8e-5 torr. Lower toroidal field to 7.3 tesla. Everything else remains the same. Shot 16 -- Fizzle. (First hydrogen attempt today.) 50 kA. No hard x-rays. Next shot: reduce pre-fill to 2.5e-5 torr and try again. Shot 17 -- Plasma, disrupted at 0.57 s. Some hard x-rays. Hydrogen fraction is about 60% Next shot: increase hydrogen pre-fill to 2.7e-5 torr. Shot 18 -- Plasma, good shot, until the lithium pellet at 1.05 s killed it. Prf= 1 MW approx. End of run. Last shot until next autumn. |
| Session Leader Comments | |||
| Jun 9 1995 05:50:53:440PM | 950609001 | Yuichi Takase | 950609 (last run of Phase II-B)
MP #117 He3 minority heating at 8T Density scan shot 01 fiz |
| Jun 9 1995 05:51:27:610PM | 950609002 | Yuichi Takase | shot 02 pl disrupt @ 0.76s (OH1 pulled out)
shot delayed - computer problems, CRYO temp reading problem, etc. |
| Jun 9 1995 05:51:43:110PM | 950609003 | Yuichi Takase | shot 03 pl 7.9T, 1MA, nel_04=1.1e20, E-port only, P_RF=1MW
|
| Jun 9 1995 05:51:56:170PM | 950609004 | Yuichi Takase | shot 04 pl nel_04=1.2e20, E-port only, P_RF=1.2MW
|
| Jun 9 1995 05:52:13:050PM | 950609005 | Yuichi Takase | shot 05 pl nel_04=1.1e20, D-port tripped, P_RF=2.3MW, W_EFIT=61-83kJ
TF didn't get to flattop |
| Jun 9 1995 05:52:24:380PM | 950609006 | Yuichi Takase | shot 06 pl nel_04=0.9e20, D-port tripped, P_RF=1.1MW
|
| Jun 9 1995 05:52:34:640PM | 950609007 | Yuichi Takase | shot 07 pl nel_04=0.9e20, D-port tripped, P_RF=1.2MW
|
| Jun 9 1995 05:54:08:370PM | 950609008 | Yuichi Takase | going up in density, enable Li pellet @ 1.1s
shot 08 pl nel_04=1.4->1.3e20, D-port tripped, P_RF=1.3MW, disrupt @ 0.93s D-port problem is with the phase balance detector disable D-port arc det from the cell (still have transmitter arc det) |
| Jun 9 1995 05:54:23:450PM | 950609009 | Yuichi Takase | shot 09 pl nel_04=1.5->1.2e20, got both RF, P_RF=2.1MW
|
| Jun 9 1995 05:54:34:390PM | 950609010 | Yuichi Takase | shot 10 pl nel_04=1.6->1.4->1.5e20, got both RF, P_RF=2.3MW
|
| Jun 9 1995 05:54:53:010PM | 950609011 | Yuichi Takase | shot 11 pl PEP mode (Li pellet @ 0.75s), nel_04=3->1.3e20, P_RF=2.3MW
W_EFIT=60->115kJ, Ti_HIREX=3.6keV, Te0=3keV (sawtooth suppressed) 6e13neuts/s, little H-mode @ 0.85s |
| Jun 9 1995 05:55:07:310PM | 950609012 | Yuichi Takase | shot 12 pl PEP mode (Li pellet @ 0.74s), nel_04=2.7->1.3e20, P_RF=2.5MW
W_EFIT=60->110kJ, Ti_HIREX=3.6keV, Te0=3keV (sawtooth suppressed) 6e13neuts/s (not as good) |
| Jun 9 1995 05:55:20:800PM | 950609013 | Yuichi Takase | shot 13 pl PEP mode (Li pellet @ 0.76s), nel_04=3->1.3e20, P_RF=2.5MW
W_EFIT=60->130kJ, Ti_HIREX=3.6keV, Te0=3keV (sawtooth suppressed) 8e13neuts/s, H-mode @ 0.825s ("ELM-free" @ 0.845s) |
| Jun 9 1995 05:55:58:390PM | 950609014 | Yuichi Takase | shot 14 dud
|
| Jun 9 1995 05:56:10:980PM | 950609015 | Yuichi Takase | shot 15 pl nel_04=0.9e20, P_RF=2.1MW
no spectroscopy data |
| Jun 9 1995 05:56:31:910PM | 950609016 | Yuichi Takase | 7.3T H-He3
shot 16 fiz |
| Jun 9 1995 05:56:44:900PM | 950609017 | Yuichi Takase | shot 17 pl disrupt @ 0.58s, H/H+D=0.6->0.2 (CX)
|
| Jun 9 1995 05:56:58:850PM | 950609018 | Yuichi Takase | shot 18 pl nel_04=0.9e20, D-port tripped, P_RF=1.2->0.85MW
some electron heating (not so great) |
| Physics Operator Comments | |||
| Jun 9 1995 08:26:23:330AM | Robert Granetz | MP #117 He3 minority heating at 7.9 T
SL: Y. Takase PO: R. Granetz EO: V. Bertolino This is a continuation of runs 950530 and 950531. Plasma operation will be diverted, lower x-point, in deuterium at 1 MA and 8 T, with He3 minority added for ICRF heating. The primary goal of today's run is to study RF heating over a range of densities. A secondary goal is to fiddle with the TF high-tap switching. | |
| Jun 9 1995 08:26:48:880AM | Robert Granetz | Run setup:
Discharge clean as usual in deuterium before the run Fill A-side plenum with 19-20 psi of deuterium Fill B-side-upper plenum with 19-20 psi of Helium-3 (This plenum probably already contains Helium-3, so it may not need to be purged. This stuff is expensive, after all.) Set pre-fill at 1.8e-5 torr. Start from shot 950531010, (an 8 tesla, 1 MA shot). Adjust fizzle detector appropriately. Set TF inversion at 1.1 s. Set density to nl_04=1.0e20 m-2. | |
| Jun 9 1995 08:35:48:140AM | 950609001 | Robert Granetz | Shot 01 -- Fizzle. Reasonably good null.
Next shot: reduce pre-fill from 1.8 to 1.6e-5 torr. |
| Jun 9 1995 09:01:20:620AM | 950609002 | Robert Granetz | Shot 02 -- Plasma, but OH1 faulted around 0.36 s, causing plasma current to
droop, and terminating shot at 0.76 s in a CENTERED disruption. Next shot: repeat. RF should start at 0.8 s. |
| Jun 9 1995 10:23:00:500AM | 950609003 | Robert Granetz | Shot 03 -- Plasma, good shot. 1 MA, 8 T. Prf=1 MW, from t=0.77 to 1.00 s.
Next shot: turn on FSP control, with the programmed location just about where it was on this shot at 0.6 s. Also move He3 gas pulse earlier by 0.1 s. |
| Jun 9 1995 10:36:46:820AM | 950609004 | Robert Granetz | Shot 04 -- Plasma, disrupted at 1.02 s due to excessive elongation (kappa=1.8).
This problem was caused by the FSP control. Prf=1 MW. Next shot: raise FSP strike point by 8 mm. If this results in a problem, I'll disable it. |
| Jun 9 1995 10:58:45:500AM | 950609005 | Robert Granetz | Shot 05 -- Plasma, good shot. Prf=2.3 MW. Some heating, but not too
impressive. Good control of FSP strike point. Toroidal field did not quite reach 7.9 T, and thus did not flattop. Probably due to an excessively warm TF core. Next shot: lower the requested density from 1.0 to 0.8e20 m-2. |
| Jun 9 1995 11:03:01:100AM | 950609005 | Robert Granetz | Nitrogen leak, probably on E-port seal.
|
| Jun 9 1995 11:48:50:520AM | 950609006 | Robert Granetz | Shot 06 -- Plasma, good shot. Lower density, as requested. Prf=1.1 MW.
Next shot: Change RCUR control to include a tiny amount of feedback based on the RF antenna loading (after t=1.1 s). No other changes. |
| Jun 9 1995 12:08:10:940PM | 950609007 | Robert Granetz | Shot 07 -- Plasma, good shot, except for some hard x-rays.
Next shot: raise pre-fill from 1.7 to 1.9e-5 torr, raise density to nl_04=1.3e20 m-2, and zero out the RCUR feedback on RF antenna loading. Also turn on lithium pellet injector at 1.1 s. |
| Jun 9 1995 12:16:13:580PM | 950609007 | Robert Granetz | Also, due to intense lobbying by Ian, who doesn't like the quality
of the breakdown, I lowered Br by 0.5 mT and raised Bz by 1 mT for the next shot. |
| Jun 9 1995 12:33:38:980PM | 950609008 | Robert Granetz | Shot 08 -- Plasma, disrupted at 0.93 s. EF2's were at their current limit.
Density was higher, as requested. Next shot: turn off FSP control and try again. |
| Jun 9 1995 01:25:25:410PM | 950609009 | Robert Granetz | Shot 09 -- Plasma, good shot. Prf=2.0 MW. Lithium pellet at 1.1 s.
Next shot: raise density to nl_04=1.5e20 m-2. Also turn on feedback of RCUR using the RF antenna loading, but with a very small coefficient again. Also, set up the impurity injector to shoot in niobium at 0.9 s. |
| Jun 9 1995 01:51:58:270PM | 950609010 | Robert Granetz | Shot 10 -- Plasma, good shot. Prf=2.3 MW. Lithium pellet at 1.1 s.
Higher density, as requested. Next shot: repeat. Change RCUR feedback on antenna loading to turn on at 0.9 s, rather than 1.1 s, since it looks like it may be working properly. |
| Jun 9 1995 02:23:03:640PM | 950609011 | Robert Granetz | Shot 11 -- Plasma, good shot. Prf=2.3 MW. Big lithium pellet at 0.75 s causes
a doubling of the density. There's some rumbling from the RF guys about a very short H-mode from 0.85 to 0.86 s, but I don't believe it. Next shot: repeat. Change sign of the coefficient of the antenna loading in the RCUR predictor. |
| Jun 9 1995 02:50:07:660PM | 950609012 | Robert Granetz | Shot 12 -- Plasma, good shot. Prf=2.4 MW. Another lithium pellet at 0.74 s.
Next shot: repeat, except move lithium pellet injection to 0.76 s. |
| Jun 9 1995 03:25:00:340PM | 950609013 | Robert Granetz | Shot 13 -- Plasma, good shot. Prf=2.4 MW. Lithium pellet at 0.76 s.
Next shot: lower the density to nl_04=0.8e20 m-2. Also re-enable FSP control, with the strike position raised by 5 mm from shot 08. Also increase the coefficient of the antenna loading feedback on RCUR from -200 to -400 after t=1.0 s. |
| Jun 9 1995 04:05:44:630PM | 950609014 | Robert Granetz | Shot 14 -- No plasma, or a fizzle. Can't tell because spectroscopy DAQ failed
and all the magnetics DAQ failed. Lots of DAQ failures. Apparently there must have been init failures. Next shot: try again, no changes. |
| Jun 9 1995 04:13:30:280PM | 950609015 | Robert Granetz | Shot 15 -- Plasma, good shot. Prf=2.1 MW. No lithium pellet.
Next shot: change to hydrogen plasma, with a prefill of 2.8e-5 torr. Lower toroidal field to 7.3 tesla. Everything else remains the same. |
| Jun 9 1995 04:36:23:720PM | 950609016 | Robert Granetz | Shot 16 -- Fizzle. (First hydrogen attempt today.) 50 kA. No hard x-rays.
Next shot: reduce pre-fill to 2.5e-5 torr and try again. |
| Jun 9 1995 04:52:07:400PM | 950609017 | Robert Granetz | Shot 17 -- Plasma, disrupted at 0.57 s. Some hard x-rays.
Next shot: increase hydrogen pre-fill to 2.7e-5 torr. |
| Jun 9 1995 05:16:37:360PM | 950609018 | Robert Granetz | Shot 18 -- Plasma, good shot, until the lithium pellet at 1.05 s killed
it. Prf= 1 MW approx. End of run. Last shot until next autumn. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:29:24:140AM | Plasma | Ok | |
| 2 | 08:46:46:050AM | Plasma | Bad | oh1 type 2 |
| 3 | 09:33:31:340AM | Plasma | Ok | |
| 4 | 10:23:25:740AM | Plasma | Ok | |
| 5 | 10:43:15:450AM | Plasma | Ok | |
| 6 | 11:22:59:110AM | Plasma | Ok | |
| 7 | 11:54:16:070AM | Plasma | Ok | |
| 8 | 12:25:11:150PM | Plasma | Ok | |
| 9 | 12:59:38:960PM | Plasma | Ok | |
| 10 | 01:35:05:630PM | Plasma | Ok | |
| 11 | 02:07:59:890PM | Plasma | Ok | |
| 12 | 02:35:27:270PM | Plasma | Ok | |
| 13 | 03:07:10:010PM | Plasma | Ok | |
| 14 | 03:30:52:030PM | Plasma | Ok | |
| 15 | 03:59:02:500PM | Plasma | Ok | |
| 16 | 04:26:30:770PM | Plasma | Ok | |
| 17 | 04:42:41:280PM | Plasma | Ok | |
| 18 | 05:02:34:380PM | Plasma | Ok | |