| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Ying Wang Wang |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Vinny Bertolino |
| Engineering Operator Run Comment |
| impurity screening |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:12:710PM |
| Author: To Be Determined |
| Session Leader's summary of run 950316 MP# 091 Non-recycling impurity screening study in diverted and limited plasmas Physics Operator: Granetz Session Leader: YWang Engineering Operator: Bertolino The goal of this run is to 1) compare non-recycling impurity screening between single null diverted and limited plasmas. 2) study the scaling of impurity screening as a function of electron density 3) study of effect of impurity injection location on impurity screening. 4) verify the effect of of helium discharge cleaning on argon screening. --------------------------------------------------------------------------- Planned run sequence for MP91 Parameters: B_T=5.3T Ip=.8 MA kappa = 1.50 - 1.50 Strike points fixed on vertical target plate between probe 2 and 3. Shot parameters should be kept as constant as possible from shot to shot. Suggest loading 950309009. set line density at 1.2e20 shot 1 -- 2 No impurity injection. Long discharges to stabilize the plasma density shot 3,4,5 Try to keep conditions fixed. Sc injection only to test the consistency of the laser ablation technique. shot 6: Limited, Ar(B side lower) and Sc at .6 sec. Ar pulse 26ms long at 4psi plenum pressure. (The pulse remain the same for the whole run) shot 7: Limited, Ar(B side lower) and Sc at .6 sec. Fire FSP at .50 s, .65 s,.90 s. shot 8: Limited, Ar(divertor capillary) and Sc at .6 sec. Fire FSP at .50 s, .65 s,.90 s. shot 9: The same as shot 8. shot 10-12: Diverted, No impurity injections. Adjusting the density. shot 13: Diverted. no Ar. Sc injection at .6 s. shot 14: Diverted. Ar(B side lower) and Sc at .6 sec. Fire FSP at .50 s, .65 s,.90 s. shot 15: Same as shot 14. shot 16: Diverted. Ar(divertor capillary) and Sc at .6 sec. Fire FSP at .50 s, .65 s,.90 s. shot 17: Same as shot 16. set line density at 7e19 repeat shot 6 - shot 16. Set line density at 2.0e20 repeat shot 6 - shot 16. 15 minutes of He discharge cleaning. set line density back to 1.2e20 shot 34, 35, 36: Ar(B side lower) and Sc at .6 sec. Fire FSP at .50 s, .65 s,.90 s. ------------------------------------------------------------------------- What really happened was: The run was started with a diverted plasma loaded from shot 950315034 at a line density of 1.2e20. Scandium was injected at shot 4, 5 and 8 and the laser ablation technique proved to have good repeatability. From shot 9 on, we switched to limited plasmas by limiting the plasma on the inner wall. Contrary to expectations,shot 9 and shot 10 showed no deterioration in impurity screening compared to the diverted shots. This prompted more investigation and shot 11 - shot 21 were dedicated to this purpose. It turned out that the SOL flux in shot 9 and 10 didn't circle around to terminate on the inner wall. Instead, a large portion of the SOL flux was still terminated on the outer divertor target plate, thus leaving shot 9 and shot 10 in a "semi-diverted" state. It wasn't until shot 15 that we achieved a good limited plasma. The impurity screening of the limited shots deteriorated a great deal compared to the diverted shots and we had to reduce the plenum pressure for B-side lower from 4 psi to 2 psi to keep the counting rate from going too high. Shot 22 and 23 were the same as shot 21 except the argon was puffed through NINJA divertor instead of B-side lower. Shot 24 to 26 were back to diverted again with argon puffed from NINJA divertor. With only 10 more shots to do the density scan, we were forced to change the original plan which asked for two identical shots for each setting and took one shot for each setting. Also omitted was the NINJA puffing for the limited shots. The density for shots 27 to 31 was set to 7e19. Shot 27, 28 and 29 were diverted. Shot 30 and 31 were limited. The density was set to 2e20 for shot 32 and that probably made it a fizzle. Shot 33 disrupted before .4 sec. The density then was reduced to 1.7e20 for the rest of the run. One limited shot: 34. Two diverted shots: 35 and 36. Sc was injected all through the run except for shot 01, fizzles and early disruptions. Preliminary result: 1. Divertor is still better than limiter in impurity screening. 2. Scandium screening is the same for divertor and limiter operation. However, it has a strong dependance on electron temperature. This run is successful in proving again the advantage of divertor in impurity screening. Data are also successfully collected for the study of the effect of impurity injection location on the impurity screening. However, it's less successful in terms of collecting data for impurity screening scaling study because the density scan was done in a hurry and the data quality was less than satisfactory, especially for the high density shots. The study on the effect of helium discharge cleaning was not carried out at all. It would be worthwhile to redo the last one third of the MP# 091 in the future. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:53:537PM |
| Author: To Be Determined |
| Physics operator's summary for run 950316 SL: Ying Wang PO: R. Granetz EO: V. Bertolino This run is for MP 091, comparison of impurity screening between limited and diverted plasmas using scandium laser ablation injection, and also argon gas. Start with shot 950315034 from yesterday, adjust the density to nl_04=1.2e20 m-2. (Density feedback gain is turned on.). Set pre-fill at 2.3e-5 torr. This starting shot is diverted. Later we will switch to a limited shot. This divertor/limiter comparison will be done at medium, low, and high densities. We accomplished some of the physics goals, especially at the medium and lower densities. See the session leader's summary for preliminary results. Most of the operational problems were with VDE disruptions, which were usually due to railing the EF1 or EF2 current/voltage limits. Part of this problem seemed to be mitigated by removing the slew-rate-limiting boards. Only one shot failed because of a power supply problem. Operation of stable limited plasmas lasting until rampdown was not achieved today, but fortunately that didn't prevent us from obtaining usable data. It turned out that we found it impossible to run highly elongated limited plasmas (kappa > 1.5) and still have no SOL flow into the divertor. We eventually had to settle for kappa=1.3 for the limited plasmas. Scorecard: 30 plasmas (some diverted, some limited, most disrupted) 5 fizzles 1 dud (EF1 problem) 1 TF test Shot 001 - Plasma. Disrupted upward at 0.95 s due to VDE (pretty fast one, with Ihalo_u=172 kA. Next shot: enable argon puff and shit shooter. Shot 002 - Fizzle. Not surprising given the previous upward disruption. Next shot: repeat. Shot 003 - Plasma. Disrupted downward at 0.36 s. Huge up/down oscillations in vertical position, and the plasma current seemed stuck at 0.6 MA (around the time of cross-over). Next shot: repeat. Shot 004 - Plasma. Disrupted upward at 0.98 s (VDE). Another fast one with high Ihalo_u=158 kA. Again, the slow ZCUR was lost due to EF1 voltage limitations. Argon and scandium injected at 0.6 s. Next shot: repeat, but it'll probably fizzle. Shot 005 - Plasma, Disrupted upward at 0.97 s (VDE). Engineers are checking on a possible problem with EF1, which might explain these voltage limitation problems. This shot had scandium and argon injection at 0.6 s, and the scanning probe fired twice. Next shot: move argon puff back from 0.6 to 0.5 s. Also move scandium injection to 0.5 s as well. A problem with the IGOR is holding up the next shot. Shot 006 - Fizzle. Next shot: repeat Shot 007 - Fizzle. Next shot: tweak EF4 more negative by 15 amps. Shot 008 - Plasma. Disrupted upward at 1.01 s (VDE). Scandium and argon injection at 0.5 s, and two scanning probe sweeps. Next shot: change to limited configuration by moving CLEARIN in by 2 cm, and the same for RCUR. Keep argon and scandium injections enabled. Shot 009 - Plasma. Disrupted down at 0.58 s. Plasma was toggling between diverted and limited. Next shot: decrease CLEARIN another 5 mm. Engineers changed a slew-rate limiting board in EF1 prior to this shot. Shot 010 - Plasma. No disruption. It was definitely limited. There was very little difference in the amount of argon that got in, but the initial transient was faster. Also not much difference in scandium that got in either. Next shot: repeat There was a long pause before the next shot while the engineers hooked up some instrumentation to EF1 Shot 011 - Plasma. No disruption. Very similar to the previous shot. Not much difference in the impurity levels. Brian reports that even though these shots are limited, the outboard SOL flow does not go around the bottom of the plasma, but rather goes down into the divertor. This is because the plasma is centered at Z=-2 cm, in order for Brian's FSP to work. So for the next shot, we'll move ZCUR up by 0.5 cm, which is still within the FSP's reach. Next shot: move ZCUR up by 5 mm Shot 012 - Plasma. Similar to previous shots. Brian still reports lots of signal on the outer FMP array, even though plasma definitely moved up by about 4 mm. Next shot: Move ZXL lower by -2 cm. Shot 013 - Plasma. Similar to 010, 011, 012. As with all of those shots, argon and scandium were injected at 0.5 s. Brian still sees lots of signal on the outer probes. The whole lower part of the plasma seems to have been pulled down. Comparison of ZXL shows that it did indeed move down 2 cm. Next shot: return ZXL to its previous value, and move ZCUR up to the midplane (from -1.5 cm). Shot 014 - Plasma. It was centered, but much of the SOL still went into the divertor. Argon at 0.5 s and scandium at 0.6 s. Next shot: return ZCUR to -1.5 cm and make CLEARIN much more negative (-0.02 --> -0.05 cm) Shot 015 - Plasma. Disrupted down at 0.70 s (VDE). There was noticeable marfe light on the inboard midplane this shot. It was definitely really limited, but the elongation was only 1.3. The argon at 0.5 s was much higher than previously, and may have indirectly led to the disruption. Scandium injection was moved to 0.7 s, and thus didn't make it before the disruption. Next shot: reduce argon plenum pressure from 4 to 2 psi and repeat. Shot 016 - Fizzle. Next shot: repeat Shot 017 - Fizzle. Null looks reasonable. Next shot: reduce pre-fill from 2.3 to 2.1e-5 torr and repeat Shot 018 - Plasma. Disrupted down at 0.67 s (VDE). Argon was less, due to lower plenum pressure. No scandium injection on this shot. Next shot: double slow ZCUR P gain starting at 0.5 s. Shot 019 - Plasma. Disrupted down at 0.60 s. Shot didn't last long enough for the scandium injection. Next shot: return slow ZCUR P gain to 1.5, and increase CLEARIN by 0.5 cm. Shot 020 - Plasma. Disrupted at 0.85. Scandium got in on this shot. Next shot: on a suggestion from Ian, make EF4 current 500 amps more negative, hopefully leaving more current in the EF2's. Shot 021 - Plasma. Disrupted at 0.95 s. Scandium and argon okay. Fast scanning probe can't reach these plasmas (by 1.5 cm). Next shot: puff argon from NINJA divertor, turn off argon puff from B-side-lower. Also ramp a little more negative current in EF4. Shot 022 - Plasma. Disrupted at 0.72 s, but this was definitely a thermal quench due to way too much argon from the NINJA system. Next shot: reduce NINJA plenum pressure from 75 to 16 torr. Shot 023 - Plasma. Disrupted at 0.91 s. No argon made it in. Next shot: change back to diverted plasma by copying in CLEARIN and ZCUR from shot 008. Also increase NINJA plenum pressure back up to 80 torr. Note that the changes Ian suggested concerning EF4 are still incorporated. Shot 024 - Plasma. Disrupted down at 0.40 s (VDE). Probably due to EF2's hitting their current limit. Next shot: repeat. Shot 025 - Plasma. Disrupted down at 0.42 s (VDE). Again, the EF2's railed. Next shot: copy in shot 008 and try again. Shot 026 - Plasma. Disrupted up at 1.00 s (VDE). A lot of argon. Next shot: Turn off NINJA, turn on argon from B-side-lower (with plenum pressure reset to 4 psi). Lower density to nl04=0.7e20 m-2. Also put in -500 ampere ramp in EF4 late in shot. Shot 027 - Plasma. No disruption. Diverted, nl04=0.7e20 m-2. Good shot. Argon and scandium injected. Several molybdenum injections also. Next shot: turn on the fast scanning probe and repeat. Shot 028 - Plasma. No disruption. Good shot. Argon and scandium injected. Fast scanning probe worked okay. Next shot: puff argon from NINJA rather than B-side-lower valve. Shot 029 - Plasma. Another nice diverted shot. Argon puffed from NINJA in the divertor, scandium injected at 0.7 s, and fast scanning probe. Next shot: go to limited plasma by moving CLEARIN to -4.5 cm, and reducing RCUR by 2 cm. Keep ZCUR unchanged. (I actually copied CLEARIN and RCUR from shot 022.) Shot 030 - Plasma. Limited. Disrupted at 0.68 s (thermal quench). Lots of argon. Scandium injection at 0.6 s. Next shot: repeat Shot 031 - Plasma. Limited. Disrupted down at 0.86 s (VDE). Lots of argon. Scandium at 0.6 s. No scanning probe. Next shot: raise density to nl04=2.0e20 m-2. Also put in a little more negative ramp in EF4 current towards end of shot. Shot 032 - Dud. EF1's failed to charge properly. Next shot: repeat Shot 033 - Plasma. Disrupted down at 0.39 s. It was a thermal quench, probably due to too fast a density rise. This is still limited. Next shot: reduce rate of density rise, and lower maximum density from 2.0 to 1.7e20 m-2. Shot 034 - Plasma. Limited. Disrupted at 0.72 s Next shot: change to diverted plasma, and raise argon plenum pressure to 4 psi. Correction: plenum pressure was left at 2 psi. Shot 035 - Plasma. Diverted. Disrupted in rampdown at 1.07 s. Density made it to 1.7e20 m-2. Argon and scandium injected again. Next shot: increase argon plenum pressure from 2 to 4 psi, move scandium injection to 0.9 s (to get the higher density), and enable fast scanning probe. Shot 036 - Plasma. Diverted. Disrupted up at 1.01 s (VDE). Scanning probe worked okay. Argon injected okay. Scandium too. This was the last plasma shot of the run. Shot 037 - TF only magnet test. Turn off Fizzle detector. End of run. |
| Session Leader Comments |
| Physics Operator Comments | |||
| Mar 16 1995 08:15:52:080AM | Robert Granetz | Physics operator's summary for run 950316
SL: Ying Wang PO: R. Granetz EO: V. Bertolino This run is for MP 091, comparison of impurity screening between limited and diverted plasmas using scandium and/or titanium laser ablation injection, and maybe also argon gas. Start with shot 950315034 from yesterday, adjust the density to nl_04=1.2e20 m-2. (Density feedback gain is turned on.). Set pre-fill at 2.3e-5 torr. | |
| Mar 16 1995 08:42:45:490AM | 950316001 | Robert Granetz | Shot 001 - Plasma. Disrupted upward at 0.95 s due to VDE (pretty fast one,
with Ihalo_u=172 kA. Next shot: enable argon puff and shit shooter. |
| Mar 16 1995 08:45:17:480AM | 950316002 | Robert Granetz | Shot 002 - Fizzle. Not surprising given the previous upward disruption.
Next shot: repeat. |
| Mar 16 1995 09:02:08:510AM | 950316003 | Robert Granetz | Shot 003 - Plasma. Disrupted downward at 0.36 s. Huge up/down oscillations
in vertical position, and the plasma current seemed stuck at 0.6 MA (around the time of cross-over). Next shot: repeat. |
| Mar 16 1995 09:16:05:640AM | 950316004 | Robert Granetz | Shot 004 - Plasma. Disrupted upward at 0.98 s (VDE). Another fast one with
high Ihalo_u=158 kA. Again, the slow ZCUR was lost due to EF1 voltage limitations. Argon and scandium injected at 0.6 s. Next shot: repeat, but it'll probably fizzle. |
| Mar 16 1995 09:27:19:320AM | 950316005 | Robert Granetz | Shot 005 - Plasma, Disrupted upward at 0.97 s (VDE). Engineers are checking
on a possible problem with EF1, which might explain these voltage limitation problems. This shot had scandium and argon injection at 0.6 s, and the scanning probe fired twice. Next shot: move argon puff back from 0.6 to 0.5 s. |
| Mar 16 1995 09:51:27:610AM | 950316006 | Robert Granetz | A problem with the IGOR is holding up the next shot.
Shot 006 - Fizzle. Next shot: repeat |
| Mar 16 1995 10:07:07:440AM | 950316007 | Robert Granetz | Shot 007 - Fizzle.
Next shot: tweak EF4 more negative by 15 amps. |
| Mar 16 1995 10:15:40:940AM | 950316008 | Robert Granetz | Shot 008 - Plasma. Disrupted upward at 1.01 s (VDE). Scandium and argon
injection at 0.5 s, and two scanning probe sweeps. Next shot: change to limited configuration by moving CLEARIN in. Keep argon and scandium injections enabled. |
| Mar 16 1995 10:32:21:240AM | 950316009 | Robert Granetz | Shot 009 - Plasma. Disrupted down at 0.58 s. Plasma was toggling between
diverted and limited. Next shot: decrease CLEARIN another 5 mm. |
| Mar 16 1995 10:47:04:890AM | 950316010 | Robert Granetz | Engineers changed a slew-rate limiting board in EF1 prior to this shot.
Shot 010 - Plasma. No disruption. It was definitely limited. There was very little difference in the amount of argon that got in, but the initial transient was faster. Also not much difference in scandium that got in either. Next shot: repeat |
| Mar 16 1995 11:12:42:950AM | 950316011 | Robert Granetz | There was a long pause before the next shot while the engineers hooked up
some instrumentation to EF1 Shot 011 - Plasma. No disruption. Very similar to the previous shot. Not much difference in the impurity levels. Brian reports that even though these shots are limited, the outboard SOL flow does not go around the bottom of the plasma, but rather goes down into the divertor. This is because the plasma is centered at Z=-2 cm, in order for Brian's FSP to work. So for the next shot, we'll move ZCUR up by 0.5 cm, which is still within the FSP's reach. Next shot: move ZCUR up by 5 mm |
| Mar 16 1995 11:29:29:280AM | 950316011 | Robert Granetz | Scandium and argon injected at 0.5 s. FSP scanned twice.
|
| Mar 16 1995 11:26:09:030AM | 950316012 | Robert Granetz | Shot 012 - Plasma. Similar to previous shots. Brian still reports lots of
signal on the outer FMP array. Next shot: Move ZXL lower by -2 cm. |
| Mar 16 1995 11:44:33:090AM | 950316013 | Robert Granetz | Shot 013 - Plasma. Similar to 010, 011, 012. As with all of those shots,
argon and scandium were injected at 0.5 s. Brian still sees lots of signal on the outer probes. The whole lower part of the plasma seems to have been pulled down. Comparison of ZXL shows that it did indeed move down 2 cm. Next shot: return ZXL to its previous value, and move ZCUR up to the midplane (from -1.5 cm). |
| Mar 16 1995 12:10:03:190PM | 950316014 | Robert Granetz | Shot 014 - Plasma. It was centered, but much of the SOL still went into the
divertor. Argon at 0.5 s and scandium at 0.6 s. Next shot: return ZCUR to -1.5 cm and make CLEARIN much more negative (-0.02 --> -0.05 cm) |
| Mar 16 1995 12:24:28:200PM | 950316015 | Robert Granetz | Shot 015 - Plasma. Disrupted down at 0.70 s (VDE). There was noticeable
marfe light on the inboard midplane this shot. It was definitely really limited, but the elongation was only 1.3. The argon at 0.5 s was much higher than previously, and may have indirectly led to the disruption. Scandium injection was moved to 0.7 s, and thus didn't make it before the disruption. Next shot: reduce argon plenum pressure from 4 to 2 psi and repeat. |
| Mar 16 1995 12:29:41:950PM | 950316016 | Robert Granetz | Shot 016 - Fizzle.
Next shot: repeat |
| Mar 16 1995 12:38:02:240PM | 950316017 | Robert Granetz | Shot 017 - Fizzle. Null looks reasonable.
Next shot: reduce pre-fill from 2.3 to 2.1e-5 torr and repeat |
| Mar 16 1995 12:57:33:010PM | 950316018 | Robert Granetz | Shot 018 - Plasma. Disrupted down at 0.67 s (VDE). Argon was less, due
to lower plenum pressure. No scandium injection on this shot. Next shot: double slow ZCUR P gain starting at 0.5 s. |
| Mar 16 1995 01:11:01:270PM | 950316019 | Robert Granetz | Shot 019 - Plasma. Disrupted down at 0.60 s. Shot didn't last long
enough for the scandium injection. Next shot: return slow ZCUR P gain to 1.5, and increase CLEARIN by 0.5 cm. |
| Mar 16 1995 01:18:11:630PM | 950316020 | Robert Granetz | Shot 020 - Plasma. Disrupted at 0.85. Scandium got in on this shot.
Next shot: on a suggestion from Ian, make EF4 current 500 amps more negative, hopefully leaving more current in the EF2's. |
| Mar 16 1995 01:39:22:950PM | 950316021 | Robert Granetz | Shot 021 - Plasma. Disrupted at 0.95 s. Scandium and argon okay. Fast
scanning probe can't reach these plasmas (by 1.5 cm). Next shot: puff argon from NINJA divertor, turn off argon puff from B-side-lower. Also ramp a little more negative current in EF4. |
| Mar 16 1995 02:02:03:900PM | 950316022 | Robert Granetz | Shot 022 - Plasma. Disrupted at 0.72 s, but this was definitely a thermal
quench due to way too much argon from the NINJA system. Next shot: reduce NINJA plenum pressure from 75 to 16 torr. |
| Mar 16 1995 02:13:32:620PM | 950316023 | Robert Granetz | Shot 023 - Plasma. Disrupted at 0.91 s. No argon made it in.
Next shot: change back to diverted plasma by copying in CLEARIN and ZCUR from shot 008. Also increase NINJA plenum pressure back up to 80 torr. Note that the changes Ian suggested concerning EF4 are still incorporated. |
| Mar 16 1995 02:21:59:570PM | 950316024 | Robert Granetz | Shot 024 - Plasma. Disrupted down at 0.40 s (VDE). Probably due to EF2's
hitting their current limit. Next shot: repeat. |
| Mar 16 1995 02:27:57:490PM | 950316025 | Robert Granetz | Shot 025 - Plasma. Disrupted down at 0.42 s (VDE). Again, the EF2's railed.
Next shot: copy in shot 008 and try again. |
| Mar 16 1995 02:45:59:160PM | 950316026 | Robert Granetz | Shot 026 - Plasma. Disrupted up at 1.00 s (VDE). A lot of argon.
Next shot: Turn off NINJA, turn on argon from B-side-lower (with plenum pressure reset to 4 psi). Lower density to nl04=0.7e20 m-2. Also put in -500 ampere ramp in EF4 late in shot. |
| Mar 16 1995 02:57:48:510PM | 950316027 | Robert Granetz | Shot 027 - Plasma. No disruption. Diverted, nl04=0.7e20 m-2. Good shot.
Argon and scandium injected. Several molybdenum injections also. Next shot: turn on the fast scanning probe and repeat. |
| Mar 16 1995 03:13:36:050PM | 950316028 | Robert Granetz | Shot 028 - Plasma. No disruption. Good shot. Argon and scandium injected.
Next shot: puff argon from NINJA rather than B-side-lower valve. |
| Mar 16 1995 03:23:45:700PM | 950316028 | Robert Granetz | Fast scanning probe worked okay.
|
| Mar 16 1995 03:27:27:860PM | 950316029 | Robert Granetz | Shot 029 - Plasma. Another nice diverted shot. Argon puffed from NINJA
in the divertor, scandium injected at 0.7 s, and fast scanning probe. Next shot: go to limited plasma by moving CLEARIN to -4.5 cm, and reducing RCUR by 2 cm. Keep ZCUR unchanged. |
| Mar 16 1995 03:43:29:250PM | 950316030 | Robert Granetz | Shot 030 - Plasma. Limited. Disrupted at 0.68 s (thermal quench). Lots of
argon. Scandium injection at 0.6 s. Next shot: repeat |
| Mar 16 1995 03:55:50:300PM | 950316031 | Robert Granetz | Shot 031 - Plasma. Limited. Disrupted down at 0.86 s (VDE). Lots of argon.
Scandium at 0.6 s. No scanning probe. Next shot: raise density to nl04=2.0e20 m-2. Also put in a little more negative ramp in EF4 current towards end of shot. |
| Mar 16 1995 04:02:00:690PM | 950316032 | Robert Granetz | Shot 032 - Dud. EF1's failed to charge properly.
Next shot: repeat |
| Mar 16 1995 04:16:24:380PM | 950316033 | Robert Granetz | Shot 033 - Plasma. Disrupted down at 0.39 s. It was a thermal quench,
probably due to too fast a density rise. This is still limited. Next shot: reduce rate of density rise, and lower maximum density from 2.0 to 1.7e20 m-2. |
| Mar 16 1995 04:24:53:120PM | 950316034 | Robert Granetz | Shot 034 - Plasma. Limited. Disrupted at 0.72 s
Next shot: change to diverted plasma, and raise argon plenum pressure to 4 psi. |
| Mar 16 1995 04:30:37:520PM | 950316034 | Robert Granetz | Correction: plenum pressure was left at 2 psi.
|
| Mar 16 1995 04:36:37:560PM | 950316035 | Robert Granetz | Shot 035 - Plasma. Disrupted in rampdown at 1.07 s. Density made it
to 1.7e20 m-2. Argon and scandium injected again. Next shot: increase argon plenum pressure from 2 to 4 psi, move scandium injection to 0.9 s (to get the higher density), and enable fast scanning probe. |
| Mar 16 1995 04:49:26:880PM | 950316036 | Robert Granetz | Shot 036 - Plasma. Diverted. Disrupted up at 1.01 s (VDE). Scanning probe
worked okay. Argon injected okay. Scandium too. This was the last plasma shot of the run. |
| Mar 16 1995 04:54:48:420PM | 950316037 | Robert Granetz | Shot 037 - TF only magnet test. Turn off Fizzle detector.
End of run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:28:34:470AM | Plasma | Ok | no faults |
| 2 | 08:41:36:930AM | Plasma | Ok | no faults |
| 3 | 08:49:59:530AM | Plasma | Ok | no faults |
| 4 | 09:07:07:770AM | Plasma | Ok | no faults |
| 5 | 09:20:40:980AM | Plasma | Ok | no faults |
| 6 | 09:47:41:530AM | Plasma | Ok | no faults |
| 7 | 09:57:53:250AM | Plasma | Ok | no faults |
| 8 | 10:08:58:210AM | Plasma | Ok | no faults |
| 9 | 10:23:25:340AM | Plasma | Ok | no faults |
| 10 | 10:36:39:090AM | Plasma | Ok | no faults |
| 11 | 11:03:57:290AM | Plasma | Ok | no faults |
| 12 | 11:17:23:280AM | Plasma | Ok | no faults |
| 13 | 11:30:34:520AM | Plasma | Ok | no faults |
| 14 | 11:49:39:950AM | Plasma | Ok | no faults |
| 15 | 12:11:15:050PM | Plasma | Ok | no faults |
| 16 | 12:24:05:860PM | Plasma | Ok | no faults |
| 17 | 12:33:05:300PM | Plasma | Ok | no faults |
| 18 | 12:45:47:850PM | Plasma | Ok | no faults |
| 19 | 12:59:10:540PM | Plasma | Ok | no faults |
| 20 | 01:11:41:490PM | Plasma | Ok | no faults |
| 21 | 01:25:50:470PM | Plasma | Ok | Comm fault EF1 U&L, OH1 |
| 22 | 01:39:03:550PM | Plasma | Ok | no faults |
| 23 | 02:03:25:510PM | Plasma | Ok | no faults |
| 24 | 02:15:00:370PM | Plasma | Ok | no faults |
| 25 | 02:24:30:840PM | Plasma | Ok | no faults |
| 26 | 02:34:21:180PM | Plasma | Ok | no faults |
| 27 | 02:47:07:740PM | Plasma | Ok | no faults |
| 28 | 03:04:37:240PM | Plasma | Ok | no faults |
| 29 | 03:19:41:220PM | Plasma | Ok | No Faults. |
| 30 | 03:32:46:710PM | Plasma | Ok | nofaults |
| 31 | 03:45:15:640PM | Plasma | Ok | no faults |
| 32 | 03:58:01:590PM | Plasma | Bad | ef1's don't follow commands |
| 33 | 04:07:43:280PM | Plasma | Ok | no faults |
| 34 | 04:18:02:540PM | Plasma | Ok | no faults |
| 35 | 04:29:18:560PM | Plasma | Ok | no faults |
| 36 | 04:40:24:430PM | Plasma | Ok | no faults |
| 37 | 04:51:38:350PM | Test | Ok | TF only |