| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Steve Golovato |
| Physics operator(s): | Joseph Snipes |
| Engineering operator(s): | Vinny Bertolino,Joe Daigle |
| Engineering Operator Run Comment |
| snipe/hmode |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:13:663PM |
| Author: To Be Determined |
| run summary - 950505 --------------------- SL: golovato PO: snipes EO: bertolino/daigle This run was moderately successful. We got many "good" h-modes but they were brief (40-70ms) and had modest h-factors (1.3-1.4). "Good" h-modes are defined here to mean elm-free and with a sharp density rise (much improved particle confinement). The main problem with obtaining good h-modes with icrf is that low thresholds imply low density and large outer gaps, both of which lower loading and lower power for a given voltage limit. When we enter the h-mode loading drops further and the density (and threshold) rise sharply. The upshot of this is that the best icrf h-modes occur with higher starting densities where we can put in more power, but the sharp density rise appears to keep us always near the threshold such that, at best we oscillate back and forth between elm-free and elmy phases. We started at 800ka and nl04=0.8-0.9e20 just before the rf and got elmy h-modes at just under 2 MW. By raising the initial density to 1.1e20, we began to get short elm-free phases. Since the drop in loading in h-mode required us to lower the power during h-mode to avoid trips (even though we increased our maximum voltage trip point all day), we tried playing around with moving the plasma toward the antenna as we entered h-mode (feed-forward rather than feedback control of the outer gap) but had no great success. We did not exhaust the possibilities here and it could be worth trying this some more, maybe with feedback. We then went to 1MA and tried to raise the initial density. It turned out that the a-side valve was flat out, so we did several things to get the density up; raising the plenum pressure, adding more preprogrmmed gas, moving the rf later in time, and puffing from b-side upper as well as a-side. We raised the initial density to 1.3e20 and the initial power to 2.7MW (this through higher loading and higher voltage trip limit) and got three got oscillations from elm-free to elmy to elm-free... It appeared that the drop in power coupled with the density increase in the elm-free phase caused a reversion to an elmy phase (or l-mode) where the density decreased. This process repeated itself 2-3 times on many shots. We tried 1.2MA and got an h-mode on one shot, but after getting late disruptions on each shot chickened out of running at such high currents and went to low current (600kA) where the l-mode confinement is worse, hoping to see bigger h-factors. We also lowered the initial density at the lower current and got continuous elmy h-modes. There appeared to be sharp increases in moly as well as density in the elm-free h-modes. Jim Terry tried several laser blowoffs to measure the impurity transport. Brian got several FSP scans during elm-free phases. It is not clear what we can do to get long elm-free h-modes. It seems the loading problem is forcing us to track the threshold and never get much above it with the power we have available. The high moly levels may be playing a role in the low h-factors. We have almost 3 weeks to the next h-mode run, enough time to plot some new strategies. The session leader shot-to-shot summary can be found in the logbook under the session_leader topic. Details on technical difficulties can be found in the physics operator summary. The shot summary was: 25 plasmas (only one disrupted too early to use) 4 fizzles |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:54:147PM |
| Author: To Be Determined |
| ICRF H-mode Run Engineer in Charge: Vinny Bertolino Physics Operator: Joseph Snipes Session Leader: Steve Golovato Copied shot 950504018 with reduced pre-programmed density. Plan is to try to increase the H-mode H factors with high power ICRF. The plasma current was scanned up to 1.2 MA and down to 0.6 MA. There were 23 H-mode shots today at each of the three plasma currents. The ELM-free H-modes lasted up to 60 msec with H factors up to about 1.35. We had a very good run and the machine ran very well. The difficulties of getting high H factor long duration ICRF H-modes are that the RF couples well only at high density, but the H-mode threshold increases with density, so more power is required to maintain the H-mode. The density rises in ELM-free H-mode are not well controlled and soon the RF power is insufficient to remain in H-mode. The highest RF power achieved today was about 2.5 MW. Perhaps, one indication from this run is that smaller outer gaps may not be so bad for H-modes as previously thought in that we ran outer gaps down to 1.2 cm and still achieved fairly good H-modes. So, it may be possible to run even smaller outer gaps to improve the RF coupling and increase the input power to improve the H-modes. The Fast Scanning Probe was inserted into several H-mode shots, so there should be some good edge H-mode data from this run. Run statistics: 29 shots, 27 plasmas, 2 fizzles Shot 1 Pre fill set to 2.0 x 10^-5 Torr. nl04 set to 7 x 10^19 m^-2. Reached 300 kA, but then disrupted. EFC fault that occurs after the plasma disappears!? Lots of hard x rays. Shot 2 Returned nel to 1.38 x 10^20 m^-2 as in shot 950504018. RF should be on for this shot. Disrupted at 0.5 sec. Density rise too rapid. Reduced the rate of rise of the density for shot 3. Shot 3 Good shot. ICRF H-mode from 0.65 - 0.92 sec. Shot 4 Reduced density to 1.1 x 10^20 m^-2. Good shot. ELMy ICRF H-mode from 0.65 to 0.9 sec. Shot 5 Put a step in the RCUR of 3 mm from 0.5 to 0.8 sec to decrease the outer gap while the density rises. ELMy RF H-mode 0.65 to almost 1 sec. Shot 6 Raised density to 1.3 x 10^20 at 0.6 sec, maintaining the rate of rise of the density before 0.5 sec to avoid disruptions. Then, lowered the density to 1.2 x 10^20 m^-2 after 0.75 sec. Good shot. ELM-free RF H-mode 0.7 - 0.75 s. Shot 7 Took out the step in RCUR. Moved ZXL down by 1 cm from 0.55 to 1.2 sec. Good shot. ELM-free ICRF H-mode from 0.69 - 0.74 sec. Shot 8 Decreased RXL by 5 mm during the flattop. Good shot. ELM-free ICRF H-mode from 0.69 - 0.73 sec. Shot 8 Decreased RXL by 5 mm during the flattop. Good shot. ELM-free ICRF H-mode from 0.69 - 0.73 sec, then ELMy until 0.9 sec. Shot 9 Repeat with FSP at 0.7 and 0.95 sec. Disrupted at 0.88 sec. Moly level rises dramatically during RF. ELM-free RF H-mode from 0.69 - 0.73 sec, then ELMy until 0.8 sec. Shot 10 Stepped out RCUR by 3 mm from 0.65 to 1.0 sec. Enabled Ar puff. Disrupted at 0.55 sec. Too much Ar. Reduced puff by a factor of two in duration for shot 11. Shot 10 Stepped out RCUR by 3 mm from 0.65 to 1.0 sec. Enabled Ar puff. Disrupted at 0.55 sec. Too much Ar. Reduced puff by a factor of two in duration for shot 11. Correction. John was just feeling guilty. It was a large moly injection that caused the disruption. Shot 11 Repeat with shorter Ar puff. ELM-free RF H-mode from 0.69 to 0.73 sec, then ELMy until 0.92 sec. Shot 12 Longer Ar puff (28 ms). Ip raised to 1.0 MA. Disrupted at 1.15 sec. RF D port antenna failed, so there was only 0.5 MW of RF power. No H-mode. Shot 13 Repeat. Good shot. ELM-free RF H-mode from 0.69 - 0.73 sec, then ELMy until 1.09 sec. Shot 14 Raised programmed nel to 1.5 x 10^20 m^-2 hoping to get 1.4. Disrupted at 0.96 sec. ELM-free RF H-mode from 0.69 - 0.73 sec, then ELMy until the disruption. Moly injection at 0.9 sec led to the disruption. Shot 15 Raised pre-programmed gas from 0.25 to 0.6 sec to try to increase the density. Two RF H-modes from 0.69 - 0.73 and 0.81 - 0.86 sec. H factor 1.25. Shot 16 Moved RF time to 0.7 sec. Good shot. Several RF H-modes from 0.72 to 0.92 sec. Shot 17 Tweaked density to try to increase it a bit. Good shot. RF H-modes from 0.72 to 0.91 sec. Shot 18 Repeat with A side plenum set to 20 psi. RF moved back to 0.75 sec. Good shot. RF H-mode from 0.85 to 0.95 sec. H factor of 1.2. Shot 19 Added B side upper gas valve to get more density. Set to 31 V from 0.3 to 0.75 sec. Good shot. ELM-free RF H-modes from 0.85 - 0.91 sec and 0.95 to 1.02 sec. Shot 20 Repeat. Good shot. ELM-free RF H-modes from 0.78 - 0.83 and 0.87 - 0.92 sec. Shot 21 Repeat with Sc injection at 0.775 sec. Good shot. 3 RF H-modes from 0.78 - 0.83, 0.87 - 0.9, and 0.92 - 0.95 sec. H factor of 1.35. Shot 22 Repeat with Sc injection at 775 msec. Good shot. 3 RF H-modes 0.77 - 0.83, 0.86 - 0.89, and 0.92 - 0.96 sec. Shot 23 Raised Ip to 1.2 MA. Disrupted at 1.08 sec. RF H-mode from 0.91 - 0.96 sec. Shot 24 Lowered EF4 gain after 0.3 sec to 1. Disrupted at 1.02 sec with almost 1.2 MA. RF H-mode from 0.77 to 0.83 sec. H factor of about 1.0. Shot 25 Lowered Ip to 0.6 MA and nel to 1.0 x 10^20 m^-2. Turned off B side upper gas valve. Fizzle! Shot 26 Try again. Good shot at 0.6 MA. ELMy RF H-mode from 0.8 - 1.0 sec. Shot 27 Fizzle! Shot 28 Try again. Good shot. ELMy RF H-mode from 0.82 - 1.01 sec. Shot 29 Reduced nel to 9 x 10^19 m^-2. Good shot. RF only got 0.9 MW. No H-mode. |
| Session Leader Comments | |||
| May 5 1995 08:54:28:030AM | Steve Golovato | starting with shot 950504018, an h-mode shot from yesterday.
| |
| May 5 1995 09:00:45:080AM | Steve Golovato | run 950505 - continuation of yesterday's run on icrf h-modes.
main goal is to improve the h-factor by producing elm-free h-modes. we will do a current scan, play with the gaps to control the loading during h-mode to avoid rf voltage limits and to control whe nwe go into h-mode, among other things. | |
| May 5 1995 08:48:14:880AM | 950505001 | Steve Golovato | shot 950505001 - fizzle.
|
| May 5 1995 09:13:03:150AM | 950505001 | Steve Golovato | shot 950505003 - plasma. nl=.9e20(just before rf), 1.8mw.
h-mode with 40ms elm-free phase during which density ramps to 1.35e20. |
| May 5 1995 08:48:27:980AM | 950505002 | Steve Golovato | shot 950505002 - fizzle.
|
| May 5 1995 09:13:09:120AM | 950505003 | Steve Golovato | shot 950505003 - plasma. nl=.9e20(just before rf), 1.8mw.
h-mode with 40ms elm-free phase during which density ramps to 1.35e20. |
| May 5 1995 09:28:12:240AM | 950505004 | Steve Golovato | shot 950505004 - plasma. nl=.8e20(just before rf), 1.7mw.
h-mode, no elm-free phase. |
| May 5 1995 09:36:22:540AM | 950505005 | Steve Golovato | shot 950505005 - plasma. nl=.8e20(just before rf), 1.9mw.
moved plasma out by 6mm at start of rf to stay in l-mode, then back in to get h-mode (if it works). very similar to last shot. |
| May 5 1995 10:12:10:120AM | 950505006 | Steve Golovato | shot 950505006 - plasma. nl=1.1e20(just before rf), 1.85mw.
raised density before rf then reduced it slightly so gas feed is decreasing at h-mode transition. we seem to get elm-free phase at higher density although threshold to higher. got elm-free phase which ended at rf interrupt. |
| May 5 1995 10:28:44:150AM | 950505007 | Steve Golovato | shot 950505007 - plasma. nl=1.05e20(just before rf), 2.mw.
got elm-free phase ended by voltage max interrupts on both d and e. lowering power to try to avoid this. we're getting very low loading in this phase. |
| May 5 1995 10:44:32:540AM | 950505008 | Steve Golovato | shot 950505008 - plasma. nl=1.1e20(just before rf), 1.8.mw.
rf power drop avoided trips but h-mode ended at the same time. we've moved the divdertor strike point down over the last two shots by moving the x-point down and in. we will take one more shot like this so brian can get a fsp scan during h-mode. |
| May 5 1995 11:06:16:750AM | 950505009 | Steve Golovato | shot 950505009 - plasma. nl=1.05e20(just before rf), 1.9.mw.
disrupted at .9 sec. similar h-mode to before. try moving plasma out to maintain loading in h-mode, allowing higher power. |
| May 5 1995 11:15:49:670AM | 950505010 | Steve Golovato | shot 950505010 - plasma. early disruption at 550ms, before rf pulse.
had enabled argon, may have been too much. actually was a moly event, but we'll shorten the argon puff as well. |
| May 5 1995 11:37:13:660AM | 950505011 | Steve Golovato | shot 950505011 - plasma. good shot again. nl=1.05. 1.9mw
same elm-free h-mode we've been getting, lasting about 40ms. go to 1ma for next shot. |
| May 5 1995 11:54:59:960AM | 950505012 | Steve Golovato | shot 950505012 - plasma. nl=1.1e20, no d-port rf. 1MA
no h-modes. only 0.5mw |
| May 5 1995 12:15:00:880PM | 950505013 | Steve Golovato | shot 950505013 - plasma. nl=1.1e20, 1.7mw.
same h-mode. try rasing density. |
| May 5 1995 12:37:36:600PM | 950505014 | Steve Golovato | shot 950505014 - plasma. nl=1.1e20, 2mw.
density not higher. disruption at 950ms from moly injection. 200ka halo current (strike 1). |
| May 5 1995 12:45:58:120PM | 950505015 | Steve Golovato | shot 950505015 - plasma. nl=1.1e20, 2.5mw.
density not higher. a-side maxed out. |
| May 5 1995 12:46:57:490PM | 950505015 | Steve Golovato | shot 950505015 - got second elm-free phase, higher power is good!
|
| May 5 1995 01:06:45:240PM | 950505016 | Steve Golovato | shot 950505016 - raising plenum pressure and moving rf back 50ms
to let density get higher before rf turn-on. nl=1.3e20, 2.7mw. got several elm-free periods, need to link them together. getting e-port trips. |
| May 5 1995 01:22:04:660PM | 950505017 | Steve Golovato | shot 950505017 - plasma. nl=1.3e20, 2.7mw. longer elm-free phase,
60ms. |
| May 5 1995 01:46:14:590PM | 950505018 | Steve Golovato | shot 950505018 - plasma. nl=1.3e20, 2.2mw.
d-port tripped at first, came on late. got 50ms elm-free phase, |
| May 5 1995 02:05:26:940PM | 950505019 | Steve Golovato | shot 950505019- plasma. nl=1.5e20, 2.3mw.
adding second puff valve to get more initial density. rf running from 750-1000ms. 60ms h-mode. both antennas tripping at first, come on at 820-840ms. |
| May 5 1995 02:28:40:540PM | 950505020 | Steve Golovato | shot 950505020- plasma. nl=1.5e20, 2.3mw.
d-port transmitter tripped at 810ms. got h-mode at <1mw at 870ms, after d tripped. |
| May 5 1995 02:39:43:470PM | 950505021 | Steve Golovato | shot 950505021 - plasma. nl=1.5e20, 2.5mw.
got three h-mode phases, first for 70ms. trying laser blow-off and fsp. take one more shot here for them. |
| May 5 1995 02:47:35:630PM | 950505022 | Steve Golovato | shot 950505022 - plasma. nl=1.4e20, 2.5mw.
3 h-modes. got a few rf trips. |
| May 5 1995 03:31:26:140PM | 950505023 | Steve Golovato | shot 950505023 - plasma. nl=1.3e20, 2.5mw.
going to 1.2 MA. got h-mode late. |
| May 5 1995 03:32:39:510PM | 950505024 | Steve Golovato | shot 950505024 - plasma. nl=1.35e20, 2.8mw. 1.2MA.
both transmitters tripped early, lost h-mode. |
| May 5 1995 03:48:34:330PM | 950505025 | Steve Golovato | shot 950505025 - plasma. nl=1.35e20, 2.8mw.
going to 600ka. fizzle. |
| May 5 1995 03:49:09:570PM | 950505025 | Steve Golovato | shot 950505025 - going to 600ka. fizzle, no plasma.
|
| May 5 1995 04:25:00:160PM | 950505026 | Steve Golovato | shot 950505026 - plasma. nl=1.1e20. 2mw. 600ka.
elmy h-mode. |
| May 5 1995 04:25:22:620PM | 950505027 | Steve Golovato | shot 950505027 - fizzle.
|
| May 5 1995 04:47:36:150PM | 950505028 | Steve Golovato | shot 950505028 - nl=1.1e20, 2.1mw. elmy h-mode.
density drops at 750ms, proprogramming turned off here. looks just like shot 26. |
| May 5 1995 05:01:53:450PM | 950505029 | Steve Golovato | shot 950505029 - extending pre-programmed gas. lower nl to .9e20.
still got 1.1e20. no power on d-port. |
| Physics Operator Comments | |||
| May 5 1995 08:28:00:440AM | Joseph Snipes | RF H-mode Run
Set up by copying shot 950504018 but with nl04 = 7 x 10^19 m^-2 and shutting off the pre-programmed gas after 0.6 sec. Fill set to 2.0 x 10^-5 Torr. ICRF not yet ready for shot 1. | |
| May 5 1995 08:44:13:480AM | 950505001 | Joseph Snipes | Shot 1
Pre fill set to 2.0 x 10^-5 Torr. nl04 set to 7 x 10^19 m^-2. Reached 300 kA, but then disrupted. EFC fault that occurs after the plasma disappears!? Lots of hard x rays. |
| May 5 1995 08:51:16:290AM | 950505002 | Joseph Snipes | Shot 2
Returned nel to 1.38 x 10^20 m^-2 as in shot 950504018. RF should be on for this shot. Disrupted at 0.5 sec. Density rise too rapid. Reduced the rate of rise of the density for shot 3. |
| May 5 1995 09:28:08:880AM | 950505002 | Joseph Snipes | Shot 2
Returned nel to 1.38 x 10^20 m^-2 as in shot 950504018. RF should be on for this shot. Disrupted at 0.5 sec. Density rise too rapid. Reduced the rate of rise of the density for shot 3. |
| May 5 1995 09:29:32:070AM | 950505003 | Joseph Snipes | Shot 3
Good shot. ICRF H-mode from 0.65 - 0.92 sec. |
| May 5 1995 09:32:02:330AM | 950505004 | Joseph Snipes | Shot 4
Reduced density to 1.1 x 10^20 m^-2. Good shot. ELMy ICRF H-mode from 0.65 to 0.9 sec. |
| May 5 1995 09:43:01:570AM | 950505005 | Joseph Snipes | Shot 5
Put a step in the RCUR of 3 mm from 0.5 to 0.8 sec to decrease the outer gap while the density rises. ELMy RF H-mode 0.65 to almost 1 sec. |
| May 5 1995 10:00:10:010AM | 950505006 | Joseph Snipes | Shot 6
Raised density to 1.3 x 10^20 at 0.6 sec, maintaining the rate of rise of the density before 0.5 sec to avoid disruptions. Then, lowered the density to 1.2 x 10^20 m^-2 after 0.75 sec. Good shot. ELM-free RF H-mode 0.7 - 0.75 s. |
| May 5 1995 10:29:34:580AM | 950505007 | Joseph Snipes | Shot 7
Took out the step in RCUR. Moved ZXL down by 1 cm from 0.55 to 1.2 sec. Good shot. ELM-free ICRF H-mode from 0.69 - 0.74 sec. |
| May 5 1995 10:37:35:730AM | 950505008 | Joseph Snipes | Shot 8
Decreased RXL by 5 mm during the flattop. Good shot. ELM-free ICRF H-mode from 0.69 - 0.73 sec. |
| May 5 1995 10:42:31:420AM | 950505008 | Joseph Snipes | Shot 8
Decreased RXL by 5 mm during the flattop. Good shot. ELM-free ICRF H-mode from 0.69 - 0.73 sec, then ELMy until 0.9 sec. |
| May 5 1995 11:05:39:950AM | 950505009 | Joseph Snipes | Shot 9
Repeat with FSP at 0.7 and 0.95 sec. Disrupted at 0.88 sec. Moly level rises dramatically during RF. ELM-free RF H-mode from 0.69 - 0.73 sec, then ELMy until 0.8 sec. |
| May 5 1995 11:13:56:230AM | 950505010 | Joseph Snipes | Shot 10
Stepped out RCUR by 3 mm from 0.65 to 1.0 sec. Enabled Ar puff. Disrupted at 0.55 sec. Too much Ar. Reduced puff by a factor of two in duration for shot 11. |
| May 5 1995 11:15:30:980AM | 950505010 | Joseph Snipes | Shot 10
Stepped out RCUR by 3 mm from 0.65 to 1.0 sec. Enabled Ar puff. Disrupted at 0.55 sec. Too much Ar. Reduced puff by a factor of two in duration for shot 11. Correction. John was just feeling guilty. It was a large moly injection that caused the disruption. |
| May 5 1995 11:37:44:750AM | 950505011 | Joseph Snipes | Shot 11
Repeat with shorter Ar puff. ELM-free RF H-mode from 0.69 to 0.73 sec, then ELMy until 0.92 sec. |
| May 5 1995 11:51:54:680AM | 950505012 | Joseph Snipes | Shot 12
Longer Ar puff (28 ms). Ip raised to 1.0 MA. Disrupted at 1.15 sec. RF D port antenna failed, so there was only 0.5 MW of RF power. No H-mode. |
| May 5 1995 12:10:11:260PM | 950505013 | Joseph Snipes | Shot 13
Repeat. Good shot. ELM-free RF H-mode from 0.69 - 0.73 sec, then ELMy until 1.09 sec. |
| May 5 1995 12:25:08:830PM | 950505013 | Joseph Snipes | Shot 14
Raised programmed nel to 1.5 x 10^20 m^-2 hoping to get 1.4. Disrupted at 0.96 sec. ELM-free RF H-mode from 0.69 - 0.73 sec, then ELMy until the disruption. |
| May 5 1995 12:26:12:570PM | 950505014 | Joseph Snipes | Shot 14
Raised programmed nel to 1.5 x 10^20 m^-2 hoping to get 1.4. Disrupted at 0.96 sec. ELM-free RF H-mode from 0.69 - 0.73 sec, then ELMy until the disruption. Moly injection at 0.9 sec led to the disruption. |
| May 5 1995 01:10:15:100PM | 950505015 | Joseph Snipes | Shot 15
Raised pre-programmed gas from 0.25 to 0.6 sec to try to increase the density. Two RF H-modes from 0.69 - 0.73 and 0.81 - 0.86 sec. H factor 1.25. |
| May 5 1995 01:13:33:860PM | 950505016 | Joseph Snipes | Shot 16
Moved RF time to 0.7 sec. Good shot. Several RF H-modes from 0.72 to 0.92 sec. |
| May 5 1995 01:39:59:090PM | 950505017 | Joseph Snipes | Shot 17
Tweaked density to try to increase it a bit. Good shot. RF H-modes from 0.72 to 0.91 sec. |
| May 5 1995 01:44:56:310PM | 950505018 | Joseph Snipes | Shot 18
Repeat with A side plenum set to 20 psi. RF moved back to 0.75 sec. Good shot. RF H-mode from 0.85 to 0.95 sec. H factor of 1.2. |
| May 5 1995 02:09:44:740PM | 950505019 | Joseph Snipes | Shot 19
Added B side upper gas valve to get more density. Set to 31 V from 0.3 to 0.75 sec. Good shot. ELM-free RF H-modes from 0.85 - 0.91 sec and 0.95 to 1.02 sec. |
| May 5 1995 02:17:09:220PM | 950505020 | Joseph Snipes | Shot 20
Repeat. Good shot. ELM-free RF H-modes from 0.78 - 0.83 and 0.87 - 0.92 sec. |
| May 5 1995 02:37:06:010PM | 950505021 | Joseph Snipes | Shot 21
Repeat with Sc injection at 0.775 sec. Good shot. 3 RF H-modes from 0.78 - 0.83, 0.87 - 0.9, and 0.92 - 0.95 sec. H factor of 1.35. |
| May 5 1995 02:58:17:180PM | 950505022 | Joseph Snipes | Shot 22
Repeat with Sc injection at 775 msec. Good shot. 3 RF H-modes 0.77 - 0.83, 0.86 - 0.89, and 0.92 - 0.96 sec. |
| May 5 1995 03:22:35:910PM | 950505023 | Joseph Snipes | Shot 23
Raised Ip to 1.2 MA. Disrupted at 1.08 sec. RF H-mode from 0.91 - 0.96 sec. |
| May 5 1995 03:36:44:610PM | 950505024 | Joseph Snipes | Shot 24
Lowered EF4 gain after 0.3 sec to 1. Disrupted at 1.02 sec with almost 1.2 MA. RF H-mode from 0.77 to 0.83 sec. H factor of about 1.0. |
| May 5 1995 03:49:39:020PM | 950505025 | Joseph Snipes | Shot 25
Lowered Ip to 0.6 MA and nel to 1.0 x 10^20 m^-2. Turned off B side upper gas valve. Fizzle! |
| May 5 1995 04:17:38:170PM | 950505026 | Joseph Snipes | Shot 26
Try again. Good shot at 0.6 MA. ELMy RF H-mode from 0.8 - 1.0 sec. |
| May 5 1995 04:50:57:320PM | 950505027 | Joseph Snipes | Shot 27
Fizzle! |
| May 5 1995 04:51:47:130PM | 950505028 | Joseph Snipes | Shot 28
Try again. Good shot. ELMy RF H-mode from 0.82 - 1.01 sec. |
| May 5 1995 05:07:01:260PM | 950505029 | Joseph Snipes | Shot 29
Reduced nel to 9 x 10^19 m^-2. Good shot. RF only got 0.9 MW. No H-mode. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:27:21:570AM | Plasma | Ok | |
| 2 | 08:44:41:680AM | Plasma | Ok | |
| 3 | 08:54:25:920AM | Plasma | Ok | |
| 4 | 09:12:15:540AM | Plasma | Ok | |
| 5 | 09:30:45:420AM | Plasma | Ok | |
| 6 | 09:47:27:130AM | Plasma | Ok | |
| 7 | 10:12:31:300AM | Plasma | Ok | |
| 8 | 10:30:28:760AM | Plasma | Ok | |
| 9 | 10:48:24:940AM | Plasma | Ok | |
| 10 | 11:07:57:960AM | Plasma | Ok | |
| 11 | 11:24:47:100AM | Plasma | Ok | |
| 12 | 11:41:37:630AM | Plasma | Ok | |
| 13 | 11:59:14:130AM | Plasma | Ok | |
| 14 | 12:18:08:630PM | Plasma | Ok | |
| 15 | 12:35:25:640PM | Plasma | Ok | |
| 16 | 12:53:02:530PM | Plasma | Ok | |
| 17 | 01:10:25:410PM | Plasma | Ok | No Faults. |
| 18 | 01:27:15:410PM | Plasma | Ok | No Faults. |
| 19 | 01:45:24:580PM | Plasma | Ok | No Faults. |
| 20 | 02:03:25:140PM | Plasma | Ok | No Faults. |
| 21 | 02:24:03:650PM | Plasma | Ok | No Faults |
| 22 | 02:41:09:910PM | Plasma | Ok | no faults |
| 23 | 03:00:52:230PM | Plasma | Ok | no faults |
| 24 | 03:25:13:200PM | Plasma | Ok | no faults |
| 25 | 03:42:15:860PM | Plasma | Ok | No Faults. |
| 26 | 04:05:00:030PM | Plasma | Ok | No Faults. |
| 27 | 04:22:05:760PM | Plasma | Ok | No faults. |
| 28 | 04:38:49:680PM | Plasma | Ok | No Faults. |
| 29 | 04:55:41:660PM | Plasma | Ok | No Faults. |