| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Yuichi Takase |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Vinny Bertolino,Frank Silva |
| Engineering Operator Run Comment |
| silva/bertolino takase/ |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:12:227PM |
| Author: To Be Determined |
| Run Summary 950210 SL: Takase PO: Wolfe EO: Silva MP081 PEP Mode (Li pellet + ICRF) The objective of this run is to optimize PEP mode performance by: 1. scan the target density 2. scanning the current (upwards) 3. varying the pellet size and timing. A density scan with 2MW of RF power at 850kA was completed. The density was scanned from nebar=1.0e20 to 2.4e20 m-3. The maximum neutron rate during the PEP phase was in the range 4e13 to 5e13 per second, and was nearly independent of density. On the other hand, the stored energy increase was largest at intermediate density, nebar=1.7e20 to 2.0e20 m-3, and deteriorated at higher and lower densities. Towards the end of the run the current was raised to 1.1MA at a density of nebar=1.9e20 m-3. The stored energy was higher, but the neutron rate was lower compared to 850kA shots at the same density. The last shot of the run was a lower density shot (nebar=1.0e20), but we did not get Li pellet due to a "gate valve fault". More optimization is clearly needed to enhance the PEP performance at higher current. Different pellet sizes and timing were tried. Although exhaustive scan of both timing and pellet size was not completed, there were indications that a medium pellet injected 30-50msec before the RF pulse worked well. A medium pellet injected during an RF pulse does not penetrate to the plasma center. However, an attempt to inject a larger pellet or multiple pellets caused the plasma to disrupt. When a second pellet was injected 100msec after the first RF pulse (followed by another RF injection), the PEP mode performance was generally (but not always) not as good as the first injection. Because the RF power used today was 2MW to increase reliability, the record neutron rate (9e13 sec-1) observed previously with 3MW of RF power (950120016) was not surpassed. One more run is required to complete this mini-proposal, which should include 1. optimization at higher current 2. PEP mode at lower current 3. higher RF power under the best condition The following is a brief summary of today's shots: Starting from 950208028 (from H-mode threshold run, nel_04=1.0e20) with modified startup. Shot Ip nel_04 Li pellet RF W_EFIT target 01 EF3 Test 02 Fiz 03 Pla .85 1.0 none 0.9, 2.5 04 Fiz 05 Pla 1.0 none 0.0, 0.0 smaller R gap 06 Pla 1.0 M@.6 1.1, 1.1 D only 07 Pla 1.0 M@.6, L@.8 1.1, 1.2 76, 47 D only 08 Pla 1.0 M@.6, L@.8 1.6, 1.2 73, 46 09 Pla 1.0 M@.6, L@.8 1.6, 0.4 69 10 Pla (disr) 1.0 M@.6,.7 1.8 74 11 Pla (disr) 1.0 M@(.7),.8 L@.9 1.8 long pulse 79 1st pel fragm 12 Pla (disr) 1.0 M@.7,.8 L@.86 1.4 86 13 Pla 1.0 L@(.75), M@.9 2.1 89 no Lg pel 14 Pla (disr) 1.0 L@.75, M@.9 2.1(?) no data 81 15 Pla (disr) 1.0 L@.75, M@.9 2.1 96 16 Pla (disr) 1.0 M@.64, S&M@.8 2.1 short 85 17 Pla 1.0 M@.64 1.8 short 83 fast ne decay 18 Pla 1.0 M@.62, (.85) ? 74 no 2nd pel 19 Pla 0.6 M@.62, .85 1.7, 1.7 47->67 DAQ1 error turn YAG node off 20 Pla (disr) 0.6 M@.62, .85 21 Pla (disr) 0.6 M@.67, .90 1.7, 1.6 64 22 Pla 0.8 M@.67, .90 1.8, 1.8 66 23 Pla 1.2 M@(.67), .90 2.1, 2.1 (82) no 1st pel 24 Pla 1.2 M@.67, .90 2.1, 2.2 94 25 Pla 1.4 M@.67, (.90) 2.0(short), 2.2 89 no 2nd pel 26 Pla 1.5 M@(.67), .90 2.0(short), 1.0 (70) no 1st pel 27 Pla 1.5 M@.67, .90 2.1, 2.2 (80,84) Raise current to 1.1MA 28 Pla (disr) 1.2 M@.67, .90 1.9 (83) no PEP 29 Pla 1.2 M@(.78) 2.0 (97) no pellet 30 Pla 1.2 M@.77, (1.00) 1.0 (97) no 2nd pel 31 Pla 1.2 M@.77, 1.00 2.0, 2.0 68->100 32 Pla 0.8 M@(.77, 1.00) 1.8, 1.9 (59) no pel |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:53:177PM |
| Author: To Be Determined |
| Physics Operator Summary for Run 950210 SL: Takase PO: Wolfe EO: Silva,Bertolino MP 81 ICRF/Li pellet PEP modes The plan for this run (the first of two requested for MP81) was to stagger pellet injections and high-power RF pulses to produce PEP mode behavior. Planned scans included target density, plasma current, and outer gap. Unofficial piggyback activities, to keep the operator busy, included rationalization of the 5.3T startup sequence, extending the shot length, and a first cut at development for MP89, namely ramping the current down while holding the shape constant. The run was partially successful. A density scan was completed at 850kA. Only one target density, NL_04=1.2e20, was successfully used at 1.1MA; the last shot was supposed to get a point at 0.8e20, but the LPI gate valve did not open. Lots of PEP modes and H-modes were observed, but there seems to be plenty left to do in a second run. Details of the physics results will be found in the session leader's summary. A new startup segment was developed that seems pretty robust. Constant shape rampdown, a prerequisite for rampdown to a second flattop, seems relatively promising. Several shots were ramped down from 850kA to 470kA in 250msec, with shape control left constant. The edge people should note that we finally heated up some divertor tiles. The last few shots caused the temperature of some outer divertor module thermocouples to ratchet up. One just below the nose (D31-075) reached 175C after shot 32. The starting point for the run was 950208028, an 850kA shot with good inner and outer gaps, elongation ~1.7. The startup in Segment 1 was reworked as noted below. The outer gap was reduced from ~2cm to ~1.5cm as of shot 5. Aside from this, the basic equilibrium was not changed all day. A blow-by-blow can be found in the logbook under the Physics_Operator topic. A brief summary of the shots follows: Shot 1 was an EF3 test, to determine if the problem which caused yesterday's run to be stopped early was fixed. It seemed to be. Shot 2 fizzled, first try with new startup. Shot 3-18 were spent trying to get data with RF and pellets and non-disruptive shots at 850kA and NL_04=1e20. Various timings and combinations of 1,2, or 3 pellets interspersed with RF pulses were tried. Disruptions were common following the second or third pellet; some but not all could be attributed to locked modes. There were lots of H-modes and PEP modes on these shots. At shot 15 the programming was extended to run the flattop to 1.25 sec; the idea was to allow extra time so the pellets could be spaced further apart. Shot 17 (only one pellet) was the first to actually run successfully with this programming (but see problems report below). Shot 19-21 were at a target density of 0.6e20, 1.25 sec flattop (programmed). 20 had an early TF crowbar-this is a weird shot, see problems below. 21 had an EF3 problem at EOF. Shot 22 at 0.8e20, also long flattop. Shot 23-24 at 1.2e20, both long flattops, but OH1 was railing at EOF; shots survived but moved in near EOF. Shot 25-27 at 1.5e20; Needed to raise the plenum pressure to 19psi to get the density up. Had to shorten flattop back to 1.0sec to keep from railing the OH1 at 21kA current limit (increased this later). However, I only brought the current and density back in to 1 sec, leaving the shape control flat to 1.25; this is a first cut at the MP89 rampdown scenario, except no second flattop. Shot 28-31 Current at 1.1MA, NL_04 at 1.2e20. Raised OH1 current limit to 26, then 27kA to try to avoid railing this supply. Also increased EF4 to 3000Amps. All of these except 29 disrupted either in late flattop or early rampdown; 29 had no pellet. For 30 and 31 extended flattop back to 1.15sec. These both railed the OH1 and disrupted shortly thereafter. I attributed the disruptions to the current rail, but this may not have been true. These had very high halo currents, one over 200kA (strike 1). Shot 32 1.1MA, 8e19, flattop to 1.15. This shot made it to 1.2 sec, the RF was good, but the LPI gate valve didn't open (see Problems). This shot disrupted similar to 30,31, but the OH1 only reached 24 kA (i.e. did not rail). The halo current was very close to the magic 250kA (beanball). The only reason I can see that this, and maybe the others, disrupted, is that the upper x-point became close to active in the early ramp-down, and was located about on the upper shelf. This was a consequence of my leaving the shape control flat till 1.25 instead of ramping the x-points out during ramp-down. These were clearly very dangerous disruptions, and the cause and cure should be figured out before we do these again. The new startup segment proved quite successful. Shots 3,5-32 all went, tying Earl's record. I recommend using the SEG_01 from any shot after #8 as the basis for future 5Tesla startups. The changes to segment 1 were as follows: Copied IC_ef1L programming into IC_EF1U to symmetrize them Did the same for V_EF1L to V_EF1U Bring V_EF2U and V_EF2L voltages on earlier Change Engineer's timing of EF2 starts from -.4 to -.5 Increase RCUR P-gain to 9.5 from .008s to .040s Rename wires 5,6,8 to UNUSED5,UNUSED6,UNUSED8, zero their predictors Change SEG_01 wires 5-8 from 'IP' to '10' reference. Aside from being logically correct for BR_0 on wire 7, this allows a future mod to start density feedback in SEG_01 on one of these wires. Change Br_0 offset from 6.e-3 to 7.e-3 Change IC_EF4 from -1035 to -1050A Drop early PG3 (V program) significantly (note plenum was at set to 19psi to start). These drops were made to get the current rise up to snuff, namely to reach 400kA by 100msec. IN addition to these changes in seg_01, I also made changes to the current ramp around 340msec, and started the CLEARIN much further in and ramped it out more slowly. The latter seemed to help most with getting EF2's off the rails (see shot 10). Problems: --------- The EF3 problem which caused yesterday's run to end early is not completely cured. Shots 17 and 21 exhibited the effect. Vinnie did something to the PTs after 21 and the problem did not recur, but it is not clear it's gone for good. Shot 20 had an alternator fault which caused the alternator voltage to be low from the beginning. As a result, the TF crowbarred before t=0. Nevertheless, the shot ran getting up to flattop and running along, with the TF decreasing steadily, until a pellet at about .62 sec finally killed it. The engineers couldn't explain why an alternator fault and/or a TF crowbar would not keep the PF supplies from firing, or cause them to fault, but that's not what happened. This could be a dangerous interlock failure? The DAQ1 highway was going down all day again. The culprit is in crate 13 (YAG). This crate was removed from the highway at shot 22, and no more problems (also no more YAG data, a serious loss for a pellet run). In order to raise the OH1 current limit, it turns out that a pot in the supply must also be adjusted to avoid spurious (?) comm faults. This was not done yesterday, but when we finally decided to push to 26kA today, it was. This seemed to work. IGOR hung twice: once on shot 2 in store on DAQ1_CAMAC server, which was cleared by stopping the server; and before shot 30 when GANESA analysis hung over a network problem. On two occasions, the LPI gate valve faulted after a shot and it was not noticed until too late. This included the last shot of the day. It would seem that either Darren should get some indication of this (its a TORVAC fault not an LPI system fault) or the gas station engineer should be made aware if such a fault occurs; the gate valve screen is not typically up during operation, because that PC has so many functions. Scorecard --------- Tests 1 Duds 0 Fizzles 2 Plasmas 29 (28 straight from 5-32, ties Earl's record!) ------- -- Total 32 |
| Session Leader Comments | |||
| Feb 10 1995 08:42:26:200AM | 950210001 | Yuichi Takase | Today's Run: MP081 PEP Mode (Li pellet + ICRF)
Optimize PEP mode: Scan density. Scan current. Vary pellet size/timing. Shot 1: EF3 Test |
| Feb 10 1995 08:49:32:210AM | 950210002 | Yuichi Takase | Shot 2:
Starting from 950208028 (from H-mode threshold run, nel_04=1.0e20). Modified startup. Fizzle. |
| Feb 10 1995 09:16:26:630AM | 950210003 | Yuichi Takase | Shot 3:
Good shot, no Li pellet yet. nel_04=1.0e20 (target, goes up at H-mode transition). 2 RF pulses: 0.4+0.5; 1.2+1.4MW R/L gap = 2.0/1.5 D port 35kV, E port 50kV Reduce R gap by 5mm for the next shot. Li pellets (1 med. @ 0.6s, 1 large @ 0.8s) on next shot. |
| Feb 10 1995 09:17:59:250AM | 950210004 | Yuichi Takase | Shot 4:
Fizzle. |
| Feb 10 1995 09:43:42:780AM | 950210004 | Yuichi Takase | Shot 5:
Plasma, no Li pellet, no high power RF. Rgap=1.5cm (need to retune RF). |
| Feb 10 1995 09:46:45:760AM | 950210005 | Yuichi Takase | Shot 5:
Plasma, no Li pellet, no high power RF. Rgap=1.5cm (need to retune RF). |
| Feb 10 1995 09:56:54:850AM | 950210006 | Yuichi Takase | Shot 6:
Plasma medium pellet @ 0.6s D port only 1.1MW (0.65-0.75s), 1.1MW (0.85-0.95s) |
| Feb 10 1995 10:41:24:890AM | 950210007 | Yuichi Takase | Shot 7:
Plasma medium pellet @ 0.6s, large pellet @ 0.8s D port only 1.1MW (0.65-0.75s), 1.2MW (0.85-0.95s) W_EFIT 76kJ (1st pulse) 47kJ (2nd pulse) |
| Feb 10 1995 10:43:10:110AM | 950210008 | Yuichi Takase | Shot 8:
Plasma medium pellet @ 0.6s, large pellet @ 0.8s 1.6MW (0.65-0.75s), 1.2MW (0.85-0.95s) W_EFIT 73kJ (1st pulse) 46kJ (2nd pulse) |
| Feb 10 1995 11:13:51:620AM | 950210009 | Yuichi Takase | Shot 9:
Plasma medium pellet @ 0.6s, large pellet @ 0.8s 1.6MW (0.65-0.75s, short), 0.4MW (0.85-0.95s) W_EFIT 69kJ (1st pulse) |
| Feb 10 1995 11:20:11:110AM | 950210010 | Yuichi Takase | Shot 10:
Plasma, disrupted medium pellet @ 0.6s, 0.7s 1.8MW (0.65-0.75s) W_EFIT 74kJ |
| Feb 10 1995 11:21:19:040AM | 950210011 | Yuichi Takase | Shot 11:
Plasma, disrupted medium pellet @ 0.7s, 0.8s, large @ 0.9s 1.8MW (0.65-0.9s) W_EFIT 79kJ |
| Feb 10 1995 11:45:53:320AM | 950210012 | Yuichi Takase | Shot 12:
Plasma, disrupted medium pellet @ 0.7s, 0.8s, large @ 0.86s 1.4MW (0.65-0.9s) W_EFIT 86kJ |
| Feb 10 1995 12:17:36:790PM | 950210013 | Yuichi Takase | Shot 13:
Plasma large pellet @ 0.75s (didn't get it), medium @ 0.9s 2.1MW (0.65-1.0s) W_EFIT 89kJ |
| Feb 10 1995 12:24:09:140PM | 950210014 | Yuichi Takase | Shot 14:
Plasma (disrupt) large pellet @ 0.75s, medium @ 0.9s 2.1MW (estimated, no RF data) W_EFIT 81kJ |
| Feb 10 1995 12:24:42:510PM | 950210015 | Yuichi Takase | Shot 15:
Plasma (disrupt) large pellet @ 0.75s, medium @ 0.9s 2.1MW W_EFIT 96kJ |
| Feb 10 1995 12:34:39:200PM | 950210016 | Yuichi Takase | Shot 16:
Plasma (disrupt) medium pellet @ 0.64s, small + medium @ 0.8s (didn't get small) 2.1MW (short) W_EFIT 85kJ |
| Feb 10 1995 12:47:51:160PM | 950210016 | Yuichi Takase | Shot 16:
Plasma (disrupt) medium pellet @ 0.64s, small + medium @ 0.8s (didn't get small) 2.1MW (short) W_EFIT 85kJ |
| Feb 10 1995 12:52:14:500PM | 950210017 | Yuichi Takase | Shot 17:
Plasma (no disruption) medium pellet @ 0.64s 1.8MW (short) W_EFIT 83kJ |
| Feb 10 1995 01:14:34:360PM | 950210018 | Yuichi Takase | Shot 18:
Plasma (no disruption) medium pellet @ 0.62s, 0.85s (didn't get 2nd pellet) 1.8MW? (2 pulses, no E port data) W_EFIT 74kJ nel_04=1.0 start density scan, lower to nel_04=0.6 for next shot |
| Feb 10 1995 01:29:41:110PM | 950210019 | Yuichi Takase | Shot 19:
Plasma (no disruption) medium pellet @ 0.62s, 0.85s 1.8MW? (2 pulses) W_EFIT 47 -> 67kJ nel_04=0.6 DAQ1 error Turn YAG node off |
| Feb 10 1995 02:08:06:790PM | 950210020 | Yuichi Takase | Shot 20:
Plasma (disruption) medium pellet @ 0.62s nel_04=0.6 |
| Feb 10 1995 02:11:20:540PM | 950210021 | Yuichi Takase | Shot 21:
Plasma (late disruption) medium pellet @ 0.67s, 0.90s nel_04=0.6 P_RF=1.7, 1.6 W_EFIT=64kJ |
| Feb 10 1995 02:25:28:680PM | 950210022 | Yuichi Takase | Shot 22:
Plasma (late disruption) medium pellet @ 0.67s, 0.90s nel_04=0.8 P_RF=1.8, 1.8 W_EFIT=66kJ |
| Feb 10 1995 02:49:16:170PM | 950210023 | Yuichi Takase | Shot 23:
Plasma medium pellet @ 0.67s, 0.90s (no 1st pellet) nel_04=1.2 P_RF=2.1, 2.1 W_EFIT=(82kJ) 2nd pellet |
| Feb 10 1995 02:49:47:350PM | 950210024 | Yuichi Takase | Shot 24:
Plasma medium pellet @ 0.67s, 0.90s nel_04=1.2 P_RF=2.1, 2.2 W_EFIT=94kJ |
| Feb 10 1995 03:07:52:340PM | 950210025 | Yuichi Takase | Shot 25:
Plasma medium pellet @ 0.67s, 0.90s (no 2nd pellet) nel_04=1.4 P_RF=2.0(short), 2.2 W_EFIT=89kJ |
| Feb 10 1995 03:18:56:200PM | 950210026 | Yuichi Takase | Shot 26:
Plasma medium pellet @ 0.67s, 0.90s (no 1st pellet) nel_04=1.5 P_RF=2.0(short), 1.0 W_EFIT=(70kJ) |
| Feb 10 1995 03:28:58:070PM | 950210027 | Yuichi Takase | Shot 27:
Plasma medium pellet @ 0.67s, 0.90s nel_04=1.5 P_RF=1.9, 1.9 W_EFIT=80, 84kJ (2nd pellet was better on this shot). |
| Feb 10 1995 03:56:58:710PM | 950210028 | Yuichi Takase | Shot 28:
Plasma (disrupt) medium pellet @ 0.67s, 0.90s nel_04=1.2 P_RF=1.9 W_EFIT=(83kJ) no PEP |
| Feb 10 1995 04:22:26:850PM | 950210029 | Yuichi Takase | Shot 29:
Plasma medium pellet @ 0.78s (no pellet) nel_04=1.2 P_RF=2.0 W_EFIT=(97kJ) |
| Feb 10 1995 04:41:00:970PM | 950210030 | Yuichi Takase | Shot 30:
Plasma medium pellet @ 0.77s, 1.00s (no 2nd pellet) nel_04=1.2 P_RF=1.0, 1.0 W_EFIT=97kJ |
| Feb 10 1995 04:51:32:980PM | 950210031 | Yuichi Takase | Shot 31:
Plasma medium pellet @ 0.77s, 1.00s nel_04=1.2 P_RF=2.0, 2.0 W_EFIT=100kJ |
| Feb 10 1995 05:04:12:080PM | 950210032 | Yuichi Takase | Shot 32:
Plasma (disruption, 240kA halo) medium pellet @ 0.77s, 1.00s (no pellet) nel_04=0.8 P_RF=1.8, 1.9 W_EFIT=(59kJ) |
| Physics Operator Comments | |||
| Feb 10 1995 07:27:54:700AM | Steve Wolfe | Run 950210
SL: Takase PO: Wolfe EO: Silva MP 081: ICRF PEP modes (Li pellets) Initial shot setup- Load from 950208028 Symmetrize startup: Copy Seg_1 IC_EF1L -> IC_EF1U Copy Seg_1 V_EF1L -> V_EF1U Bring up EF2 voltages early (-.69) to allow earlier switch time Increase Seg_1 RCUR Pgain from 4 to 9.5 from .008 to .040 Get rid of .01 int gain on Strkpsi in Seg2 Hold IC_EF4 at 2000. until 1sec, eliminate first ramp-down point. | |
| Feb 10 1995 07:58:43:360AM | Steve Wolfe | Initial shot setup (continued)-
Turn off late gain on Wire 10 ZCUR in Seg2 | |
| Feb 10 1995 08:33:35:330AM | 950210001 | Steve Wolfe | Shot # 950210001
Test of EF3 (hopefully fixed from yesterday). More initial setup cosmetic (and maybe more) changes): Change SEG1 wires 5,6,8 names to "UNUSEDn", zero predictors Change SEG1 wires 5-8 to '10' Reference Do a BUILD_SEG before Load EF3 test ok Nothing obviously broken on PCS setup |
| Feb 10 1995 08:50:41:390AM | 950210002 | Steve Wolfe | Shot # 950210002
A-side PLenum pressure to 19psi Fill to 1.7e-5 LPI and ECE gate valve enabled TCX and PCX enabled DAQ1_CAMAC server was hung up in store from the test shot. I managed to free it by doing a TCL> STOP SERVER DAQ1_CAMAC Fizzle. Radial field looks negative. No bounce, never forms |
| Feb 10 1995 09:02:21:580AM | 950210003 | Steve Wolfe | Shot # 950210003
Change Br_0 offset from 6.e-3 to 6.5e-3 Plasma - disrupts on rampdown, got a PF crowbar. Vertical problem at 0.9 sec but made it through Breakdown runs out but hangs on. EF2s kiss the rail at 0.328, but make it through. Current rise is very slow, only 260kA at 100msec |
| Feb 10 1995 09:07:41:690AM | 950210003 | Steve Wolfe | Shot # 950210003
The null looked much worse on 3 than on 2? Too much Bz, hard to believe it went! Good RF pulse got h-modes at each pulse |
| Feb 10 1995 09:24:36:450AM | 950210004 | Steve Wolfe | Shot # 950210004
Drop seg1 gas puff. Change RCUR from 0.6625 to 0.6645 from .6sec to 1.0sec to reduce gap. Will have a pellet this time. Fizzle. Null looks bad again, still some negative radial field, and some early vertical field. No sign of ECE signal. |
| Feb 10 1995 09:39:34:620AM | 950210005 | Steve Wolfe | Shot # 950210005
Raise BR_0 to 7e-3. Change IC_EF4 from -1035 to -1050. Change EF2 start times from -.4 to -.5 Plasma- Still railed the EF2L . Current raise is better, got top 350kA at 100msec, still not good. Breakdown still a bit ratty. Null a little better, still some early Bz. Gaps look ok. |
| Feb 10 1995 09:49:49:450AM | 950210006 | Steve Wolfe | Shot # 950210006
Drop PG3 point at 17msec. No other changes. Li pellets are timed for .6 and .8 Enable the Ar for this shot. Plasma EF2L still on the rail! Less hesitation between 10 and 20msec on Ip rise. Breaks down inside and moves out. Still only 360kA at 100msec. Got 1 pellet, RF from only one xmttr. |
| Feb 10 1995 10:01:25:990AM | 950210007 | Steve Wolfe | Shot # 950210007
Lower PG3 in segment 1 (50msec ->) Plasma - 2 pellets, still a problem with E-port RF. EF2 still touches the rail. 390kA at 100msec DAQ1 CAMAC got lost again. |
| Feb 10 1995 10:24:46:820AM | 950210008 | Steve Wolfe | Shot # 950210008
Eliminate 340msec point in Ip program. This reduces the demand during and after crossover, might help. Plasma - Moly is up a bit. EF2 still rails. Got both pellets. RF still around 1MW. |
| Feb 10 1995 10:34:43:570AM | 950210009 | Steve Wolfe | Shot # 950210009
Tweak clearin ramp early. Plasma - EF2L just off the rail. Got two pellets, RF still not happy. Snipes says there was a locked mode after 2nd pellet. |
| Feb 10 1995 10:51:17:280AM | 950210010 | Steve Wolfe | Shot # 950210010
Bigger tweak on clearin ramp early (before 500msec) Pellets at .6,.7,.8 programmed Disruption after 2nd pellet (.74sec). went up, about 80kA halo. OH2l pulled out. On the other side, EF2L is pulled way off the rail at 330. |
| Feb 10 1995 10:55:36:020AM | 950210010 | Steve Wolfe | Shot # 950210010
It looks like a locked mode did it in. |
| Feb 10 1995 11:11:59:970AM | 950210011 | Steve Wolfe | Shot # 950210011
Delay the pellets after RF, .7,.8,.9 No PCS changes. Plasma - another disruption at 0.9 about 120kA halo. First pellet was a fragment, last pellet was a plasmacide. RF stayed on through the 2nd pellet ok. |
| Feb 10 1995 11:38:09:740AM | 950210012 | Steve Wolfe | Shot # 950210012
Change 3rd pellet to 0.86 No PCS changes Plasma - Another disruption. Looks like the third pellet. 150kA of halo current. No e-port RF. |
| Feb 10 1995 11:49:14:250AM | 950210013 | Steve Wolfe | Shot # 950210013
pellets at .75 (large), .9 (medium) Plasma - made it thru Only got the second pellet. Long H-mode before it, |
| Feb 10 1995 12:12:37:590PM | 950210015 | Steve Wolfe | Shot # 950210015
Extend flattop to 1.25 sec (if we can make it) Disrupted at .91 or so, so we don't know if it would have worked. 150msec halo current. |
| Feb 10 1995 12:27:13:420PM | 950210016 | Steve Wolfe | Shot # 950210016
Extend flattop to 1.25 sec (if we can make it) Extend gains on RXL and RXU to 1.25 as well (forgot last time) Note: I did move the Ip controller switch later. I don't think any others are time dependent. Medium pellet at 0.64, small/medium at 0.8 Disrupted at 0.8; halo current 110kA RF faulted at .7 sec |
| Feb 10 1995 12:44:25:520PM | 950210017 | Steve Wolfe | Shot # 950210017
Extend flattop to 1.25 sec (if we can make it) No second pellet, see if it's really the culprit Ran all the way through Lots of light around e-port antenna DAQ1 problems again, no RF data? OH1 gets close to 20kA. There is a small glitch in ZCUR at 1.25 |
| Feb 10 1995 01:02:46:770PM | 950210018 | Steve Wolfe | Shot # 950210018
Don't ramp zcur at 1.25sec; see if that's the glitch. Increase OH1 current limit to 21kA Pellets at .620 and .850 Made it all the way through. No EFC glitch; it was probably an indirect effect of OH1 hiting its current limit. Also, on previous shot, EF3 was doing its single phase funniness at about the same time. Only got the first pellet. Darren claims it's peppy |
| Feb 10 1995 01:20:10:410PM | 950210019 | Steve Wolfe | Shot # 950210019
Reduce density to 0.6e20 Fizzle detector out to 1.65 sec. Ran through, saw both pellets. Both xmitters ran "nicely" No h-modes this time. |
| Feb 10 1995 01:36:08:220PM | 950210020 | Steve Wolfe | Shot # 950210020
Repeat. There was lots of DAQ1 lossage ob the last one. Reich is turning off the YAG nodes. Early disruption at 0.63 sec. TF crowbar. TF crowbarred before commutation. This one had a halo of around 170kA. There may have been an alternator problem, or may have fired the pulse before the alternator was up. |
| Feb 10 1995 02:01:31:300PM | 950210021 | Steve Wolfe | Shot # 950210021
Pellets move to 0.67 and 0.9 sec No PCS changes. Plasma disrupted at 1.228 sec. Ip and RCUR start down and out at 1.1 sec. Only 90kA halo, but it hit the outside limiter This one was the EF3 problem again. |
| Feb 10 1995 02:18:32:940PM | 950210022 | Steve Wolfe | Shot # 950210022
Change NL04 to 0.8e20 Crate 13 will be removed from DAQ1 hiway. Disrupted again at 1.4sec Only about 50kA. Got both pellets. RF at 1.8 for both pulses. looks good. |
| Feb 10 1995 02:28:17:020PM | 950210023 | Steve Wolfe | Shot # 950210023
Change NL04 to 1.2e20 Made it all the way through. Only one pellet, good RF, 2MW on each pulse. |
| Feb 10 1995 02:40:56:500PM | 950210024 | Steve Wolfe | Shot # 950210024
Repeat NL04 = 1.2e20 RFs are good. got both pellets. Ip and RCUR going down and in at 1.1sec OH1 is on the current rail. |
| Feb 10 1995 02:55:44:590PM | 950210025 | Steve Wolfe | Shot # 950210025
Raise NL04 = 1.5e20 Shorten current and density flatop to 1.0sec. GOt one pellets, and RF has lots of faulting Disrupts at 1.35sec, at 260kA. Upward going. Didn't quite get to 1.5e20 either. |
| Feb 10 1995 03:12:50:880PM | 950210026 | Steve Wolfe | Shot # 950210026
INcrease A-side plenum pressure to 19.2psi (it was down to 16.4) Plasma ran through. Didn't get second D-port pulse. Only got second pellet. |
| Feb 10 1995 03:24:01:810PM | 950210027 | Steve Wolfe | Shot # 950210027
Repeat. Got the pellets. Got the RF. |
| Feb 10 1995 03:40:50:690PM | 950210028 | Steve Wolfe | Shot # 950210028
Density to 1.2e20 Ip to -1.1e6 IC_EF4 to 3000A, current limit to 3500. Enable shitshooter (Sc) Raise Ar plenum from 3 to 4psi Disrupt in flattop. OH1 is on its 21kA current rail from 850msec on 150kA of halo current. Got both pellets, first RF looks good. |
| Feb 10 1995 04:03:57:320PM | 950210029 | Steve Wolfe | Shot # 950210029
Raise OH1 reverse current limit to 26ka; Vinnie has to also adjust a trip in the supply. Delay RF to .81 One pellet at .78sec Sc at 0.85 Ran through No pellet. |
| Feb 10 1995 04:34:59:910PM | 950210030 | Steve Wolfe | Shot # 950210030
Extend density and current flattop to 1.15sec pellets at .77 and 1.0 Long delay for IGOR hang, then OH1 init failure. That one disrupted at 1.2 Only got one pellet. OH1 hits the rail (at 24kA) right near 1.15 Only got 1MW on each RF pulse. |
| Feb 10 1995 04:44:28:980PM | 950210031 | Steve Wolfe | Shot # 950210031
Repeat this one; raise OH1 reverse limit to "27kA", which should allow 25 real kA. Another late disruption. Made it a little further, but railed at 25000 at 1.16, disrupted at 1.22 Very similar in fact. GOt RF and pellets. move on |
| Feb 10 1995 04:48:03:600PM | 950210031 | Steve Wolfe | Shot # 950210031
Halo current was 201kA - Strike 1! |
| Feb 10 1995 05:43:56:490PM | 950210032 | Steve Wolfe | Shot # 950210032
Density to 0.8e20 LPI gate valve was closed!**%*)**_(_(!!! That was a bad disruption - Halo current was 244kA!. OH1 was not on the rail, either. RF ran fine. I don't see any power supply related reason for this one to have disrupted. The only clue from looking at the flux plot is that the upper x-point gets real close and is located on the upper shelf. Note: on the last few shots there was significant tile heating on the outer divertor. One of Brian's tc's (D31-075) reached 175C. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:23:20:160AM | Test | Ok | ef3 test 8ka o.k |
| 2 | 08:45:06:810AM | Plasma | Ok | no faults |
| 3 | 08:55:10:640AM | Plasma | Ok | comm fault ef1L plasma |
| 4 | 09:08:43:360AM | Plasma | Ok | no faults, no plasma |
| 5 | 09:30:01:920AM | Plasma | Ok | no fault, ef2u,l switch close -0.5 from -0.4 plasma |
| 6 | 09:43:21:480AM | Plasma | Ok | no faults |
| 7 | 09:55:19:530AM | Plasma | Ok | no faults |
| 8 | 10:14:06:300AM | Plasma | Ok | no faults |
| 9 | 10:28:14:710AM | Plasma | Ok | no faults |
| 10 | 10:42:31:260AM | Plasma | Ok | disruption induced comm fault |
| 11 | 11:01:12:870AM | Plasma | Ok | no faults |
| 12 | 11:15:24:520AM | Plasma | Ok | no faults |
| 13 | 11:42:23:380AM | Plasma | Ok | no faults |
| 14 | 11:53:04:250AM | Plasma | Ok | disruption induced comm faults |
| 15 | 12:08:04:800PM | Plasma | Ok | no faults |
| 16 | 12:20:17:030PM | Plasma | Ok | disruption induced comm fault |
| 17 | 12:33:54:530PM | Plasma | Ok | no faults |
| 18 | 12:53:57:190PM | Plasma | Ok | no faults |
| 19 | 01:12:06:660PM | Plasma | Ok | no faults |
| 20 | 01:24:09:680PM | Plasma | Bad | entered pulse state before received shot permissive |
| 21 | 01:51:07:780PM | Plasma | Ok | no faults but EF3 voltage irregular |
| 22 | 02:11:43:810PM | Plasma | Ok | no faults |
| 23 | 02:22:15:280PM | Plasma | Ok | no faults |
| 24 | 02:33:46:440PM | Plasma | Ok | no faults |
| 25 | 02:48:17:400PM | Plasma | Ok | no faults |
| 26 | 03:05:14:620PM | Plasma | Ok | no faults |
| 27 | 03:17:02:140PM | Plasma | Ok | no faults |
| 28 | 03:32:20:380PM | Plasma | Ok | comm faults oh1,oh2u |
| 29 | 03:56:30:370PM | Plasma | Ok | no faults |
| 30 | 04:23:07:960PM | Plasma | Ok | no faults |
| 31 | 04:40:04:410PM | Plasma | Ok | no faults |
| 32 | 04:51:49:130PM | Plasma | Ok | no faults |