| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Jim Terry |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Vinny Bertolino,Joe Daigle |
| Engineering Operator Run Comment |
| Terry X-pt |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:13:553PM |
| Author: To Be Determined |
| Run Summary for 950425 MP#109 (x-point studies) SL: Terry PO: Wolfe EO: Bertolino,Daigle The goals of this X-pt run (scheduled for 950425 and 950426) were: a) determine what impurities are responsible for the radiation coming from the X-pt region b) try to determine the reason for the location of the peak in emissivity near the X-pt c) obtain profiles of electron density from below the strike pts to above the X-pt using stark-broadened Balmer lines and the views of the K and A bottom arrays d) document the presence or absence of H_2 lines in the visible and/or in the VUV. This is the reason for beginning the run in H_2. The literature on H_2 spectra is more extensive than on D_2. e) measure the optical thickness of The n=3 to n=1 line (Lyman_beta) in H for views through or below the X-pt Overall this was a very sucessful run. We believe we have accomplished goals a), c), and d). We have comprehensive VUV (75 A - 1130 A) and visible/IR (3200 A - ~10000 A) spectra. In addition, we think that we have observed Stark broadened lines of the H Paschen series (lower state n=3). These line widths are of order 100 A! We observed the Xpt in three regimes on each shot: sheath-limited - with NL04 = 0.6e20 from .4 to .56 s ramp NL04 to ~1.4e20, where the divertor is detacthed Turn on RF (P>0.8 MW) at this density and re-attach the divertor (on shots 31-34 we have short H-modes during the RF) We discharge-cleaned on Monday April 24 in H_2 and began the run in H_2 We loaded shot 950317024 which had Ip=800 kA, Z_XL=-37.75 cm, R_XL=56.0 cm. STRIKEPSI is turned off and X-pt control was in use. We have tried to keep the the outer strike point at or lower than Probe 7. We ran essentially 100% H_2 thru shot 15 at which time we switched to D_2, by shot 20 H/(H+D) was ~15%. The H_2 was used for easier identification of the molecular spectra. The following is a blow-by-blow account: shot 001 - Tues. morning test shot 002 - loaded shot 950317024 - Good shot for first attempt Hard x-rays early - disrupted at 1.0 sec. shot 003 - Short plasma lasting 0.14 s. shot 004 - reduced the early hard x-ray problem - good shot but disrupted at 1.02 s X-pt at R=55.9 cm, Z=-37.6 cm. The outer strike pt at Probe 7 most of the time, although it is above Probe 7 for a short time. shot 005 - plasma, not pretty, disrupted at .91 - many Mo injections. shot 006 - Plasma OK, disrupted at 1.34 during rampdown shot 007 Plasma OK, disrupted at same time (1.34 s) during rampdown. Xpt moving in and up after .9 s. shot 008 Plasma OK, disrupted at 1.0 s. Xpt staying more const. after 0.8 s shot 009 Plasma OK, disrupted at 1.08 s. Upper Xpt now close to LCFS. shot 010 fizzle shot 011 Plasma OK, disrupted at 1.02 s. shot 012 Ugly plasma, disrupted at .418 s. shot 013 Plasma OK, disrupted at 1.02 s. RF generating alot of edge stuff at .9 s. shot 014 Plasma OK, disrupted at 1.02 s. shot 015 Plasma OK, disrupted at 1.20 s during rampdown. shot 016 Switched to D_2 on this shot. Plasma OK, disrupted at 1.20 s during rampdown. CX shows H/(H+D)~60% shot 017 Plasma OK, disrupted at 1.24 s. Starting spectral scans with 1 MW of RF. CX shows H/(H+D)~35-40% shot 018 Plasma OK, disrupted at 1.24 s. RF tripped very quickly CX shows H/(H+D)~30% shot 019 Plasma OK, disrupted at 1.26 s. RF power 1.5 and 1.0 MW with trips. shot 020 Plasma OK, disrupted at 1.25 s. RF power 1.5 and 1.0 MW. CX shows H/(H+D)~15% shot 021 Plasma OK, disrupted at 1.29 s. RF power 1.0 MW. shot 022 Plasma OK, disrupted at 1.30 s. RF power 1.0 MW. RF reattaches the divertor. CX shows H/(H+D)~12%. shot 023 Plasma OK, disrupted at 1.29 s. RF power 1.0 MW to 1.16 MW. shot 024 fizzle shot 025 Plasma OK, disrupted at 1.30 s. RF power 1.0 MW to 1.16 MW. shot 026 Plasma OK, disrupted at 1.30 s. RF power at 1.17 MW. CX shows H/(H+D)~10%. shot 027 Plasma OK, disrupted at 1.30 s. RF power at 1.17 MW. shot 028 Plasma OK, disrupted at 1.31 s. RF power at 1.35 MW. shot 029 Plasma OK, disrupted at 1.32 s. RF power from 1.35 to 1.0 MW. shot 030 Plasma OK, disrupted at 1.32 s. RF power from 1.38 to 1.0 MW. shot 031 Plasma OK, disrupted at 1.32 s. RF power 1.36, 2.3 and 1.0 MW. Short H-mode from 1.00 to 1.025 s shot 032 Plasma OK, disrupted at 1.32 s. RF power 1.36, 2.3 and 1.0 MW. Short H-mode from 1.00 to 1.05 s shot 033 Plasma OK, disrupted at 1.29 s. RF power 1.15, 2.5 and 1.35 MW. Short H-mode from 1.00 to 1.015 s shot 034 Plasma OK, disrupted at 1.31 s. RF power 1.13, 2.46 and 1.35 MW. Very short H-mode at 1.00 s Scorecard: _________ 1 test 2 fizzles 2 short, ugly plasmas 29 usable plasmas TOTAL=34 |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:54:020PM |
| Author: To Be Determined |
| Physics Operator Summary for 950425 MP#109 (x-point studies); piggyback MP102 (RF debugging) SL: Terry PO: Wolfe EO: Bertolino,Daigle This was the first day of a planned 1.5 day effort at studying the x-point region. From the operations point of view, the issues involved a high x-point location (to be in the field of view of the spectroscopic instruments) and a density ramp from a low density flattop (NL_04=0.6e20) to a high one (NL_04=1.4e20). An additional complication is that the run was to be begun in H2 and changed over to D2 after obtaining data on molecular H2 radiation. Once a satisfactory shot was obtained, constant shots were required for a scans of the various spectroscopic instruments (in wavelength and/or direction). Specifically, the run plan was: 1. Get a discharge with the right characteristics. Check outer strike and adjust ZXL to get it on or below probe 7. Set up 25msec Ar puff. 2. Run 4 constant shots for spectroscopic scan to see H_2 lines 3. Switch back to D2, turn on RF at 0.9sec. Spectroscopy scan for 14 shots. 4. Scan McP across x-point (10 shots). 5. If time permits, scan x-point in R. We essentially completed through step 3. After much fiddling, the RF group succeeded in getting the two transmitters to overlap, producing a maximum net power around 2.5MW on the last several shots. These all had brief H-modes around 1.0sec. All in all, not a bad result for the first full run after a vacuum break. The startup segment for this run was taken from 950424007. A 15A tweak to EF4 was applied at shot 4 to improve the startup and eliminate runaway problems. The fill pressure was raised from 1.7e-5 to 2.3e-5 during the H2 shots, and left at 2.3e-5 for the D2. Segment 2 started from 950317024, with several modifications;EF2_by_EF4 was added and the CLEARIN rampdown modified as on 950424007. The main features are the high x-point and the NL ramp, as described above. Hydrogen operation proved difficult, from the standpoint of railing power supplies. The plasmas were quite cold and resistive, and several tweaks were tried in a largely unsuccessful attempt to keep the supplies happy with loop voltages above 1.7V. Three that were somewhat beneficial were lowering the plasma (ZCUR) by 5mm (shot 6), getting rid of the pre-programmed V_OH2 points at +20V and 1sec (shot 15), and reducing the ZXU gain from 9.5; this ended up at 1 on shot 10, after some experiments that included turning it off entirely late in the shot. The Ip flattop was reduced to 1.0sec from 1.05 during the H2 operation, and put back for D2. ZXU gain was brought back up to 3 during the D2 shots (shot 19). Among the things that didn't work was recalculating the Ip controller with lower voltage weights on OH2 and EF1 (shots 5-6). Beginning with shot 16, we changed over to D2. The D2 shots had noticeably lower loop voltage and slightly higher temperatures according to the ECE. RF was fired beginning at 0.9sec. The high density was raised from 1.3e20 to 1.4e20 on shot 17. The ZXU gain was raised to 3 on shot 19, and the RXU gain to 2.4 on shot 20. After shot 20, the only changes were to the rampdown; these were only marginally successful, delaying the disruption from 1.25sec to 1.32sec. The final disruption was typically a VDE, abetted by a shark fin, as the density would not ramp down. Interestingly, I ended up with a fully diverted rampdown, as long as it lasted. Both EF1L and OH2L were on their positive voltage rails for some time before the disruption. Any of the last six or so shots, except #33, would seem to be a reasonable place to start tomorrow. Shot #33 was an attempt to ramp CLEARIN in faster during rampdown, and seemed to be a step in the wrong direction. #34 went the opposite way, and seemed better. For details of the various thrashings shot-to-shot, see the Physics_Operator topic in the logbook. The startup was fairly robust, with only two fizzles (#10 and #24). The first of these followed a bad disruption, and had a CII signal of 0.008mW/cm2/ster, over twice the normal maximum. The reason for the fizzle on #24 is unclear, and no changes were made for 25, which ran ok. There were also two short ugly shots, #3 and 12. Both followed disruptions, and both had serious runaway problems. For #13, the fill was raised to 2.3e-5 and remained there the rest of the day. Scorecard: --------- Tests 1 Duds 0 Fizzles 2 Plasmas 31 (2 < 0.5sec, 4 halo warnings, no strikes) ------- -- Total 34 |
| Session Leader Comments | |||
| Apr 25 1995 09:17:12:990AM | Jim Terry | We discharge cleaned on Monday April 24 in H_2 and are beginning the run in H_2,
although we plan to switch to D_2 early in the run. The goals of this X-pt run (scheduled for 950424 and 950425) are: a) determine what impurities are responsible for the radiation coming from the X-pt region b) try to determine the reason for the location of the peak in emissivity near the X-pt c) obtain profiles of electron density from below the strike pts to above the X-pt using stark-broadened Balmer lines and the views of the K and A bottom arrays d) document the presence or absence of H_2 lines in the visible and/or in the VUV. This is the reason for beginning the run in H_2. The literature on H_2 spectra is more extensive than on D_2. e) measure the optical thickness of The n=3 to n=1 line (Lyman_beta) in H for views through or below the X-pt We will load shot 950317024 which has Ip=800 kA, Z_XL=-37.75 cm, R_XL=56.0 cm. NL04 is initially 0.6e20 at 0.5 s, but at 0.58 s is ramped to 1.34e20. For this shot STRIKEPSI is turned off and X-pt control is in use. For this programming we will determine where the outer strike point is. If it is not at or lower than Probe 7, then we will lower the X-pt until it is. The gaps are about 2 cm. | |
| Apr 25 1995 09:18:11:420AM | 950425001 | Jim Terry | shot 001 - Usual Tues. morning test
|
| Apr 25 1995 09:18:39:420AM | 950425002 | Jim Terry | shot 002 - loaded shot 950317024 - Good shot for first attempt
Slide aways early - disrupted at 1.0 sec. |
| Apr 25 1995 09:19:12:890AM | 950425003 | Jim Terry | shot 003 - raised fill to 2.0e-5. Short plasma lasting 0.14 s.
|
| Apr 25 1995 09:40:23:590AM | 950425004 | Jim Terry | shot 004 - reduced the early hard x-ray problem - good shot but disrupted at 1.02 s
X-pt at R=55.9 cm, Z=-37.6 cm. The outer strike pt just at Probe 7, although it is slightly above Probe 7 for a short time. |
| Apr 25 1995 09:40:48:830AM | 950425005 | Jim Terry | shot 005 - plasma, but disrupted at .91 - many Mo injections
|
| Apr 25 1995 10:20:02:450AM | 950425006 | Jim Terry | shot 006 - attempting to lower the X-pt a few mm and to drop the plasma center.
Plasma OK, disrupted at 1.34 during rampdown |
| Apr 25 1995 10:20:49:310AM | 950425007 | Jim Terry | shot 007 Plasma OK, disrupted at same time (1.34 s) during rampdown.
Xpt moving in and up after .9 s. |
| Apr 25 1995 10:53:01:350AM | 950425008 | Jim Terry | shot 008 Plasma OK, disrupted at 1.0 s. Xpt staying more const. after 0.8 s
|
| Apr 25 1995 10:54:01:780AM | 950425009 | Jim Terry | shot 009 Plasma OK, disrupted at 1.08 s. Watch out for upper Xpt moving in.
|
| Apr 25 1995 11:30:56:740AM | 950425010 | Jim Terry | shot 010 fizzle
|
| Apr 25 1995 11:31:17:800AM | 950425011 | Jim Terry | shot 011 Plasma OK, disrupted at 1.02 s.
|
| Apr 25 1995 12:21:18:990PM | 950425012 | Jim Terry | shot 012 Ugly plasma, disrupted at .418 s. After this shot,
we are letting the RF people into the cell. So there will be a delay. |
| Apr 25 1995 12:22:23:990PM | 950425013 | Jim Terry | shot 013 Plasma OK, disrupted at 1.02 s.
RF generating alot of edge stuff at .9 s. Chromex sees continuum feature. |
| Apr 25 1995 12:53:30:270PM | 950425014 | Jim Terry | shot 014 Plasma OK, disrupted at 1.02 s.
|
| Apr 25 1995 12:54:50:040PM | 950425015 | Jim Terry | shot 015 Plasma OK, disrupted at 1.20 s during rampdown. Best so far.
|
| Apr 25 1995 01:39:37:340PM | 950425016 | Jim Terry | shot 016 Switched to D_2 on this shot. Plasma OK, disrupted at 1.20 s
during rampdown. CX shows H/(H+D)~60% |
| Apr 25 1995 01:40:14:960PM | 950425017 | Jim Terry | shot 017 Plasma OK, disrupted at 1.24 s. Starting spectral scan
with 1 MW of RF. CX shows H/(H+D)~35-40% |
| Apr 25 1995 04:39:17:200PM | 950425018 | Jim Terry | shot 018 Plasma OK, disrupted at 1.24 s. RF tripped very quickly
CX shows H/(H+D)~30% |
| Apr 25 1995 02:18:44:630PM | 950425019 | Jim Terry | shot 019 Plasma OK, disrupted at 1.26 s. RF power 1.5 and 1.0 MW
with trips. |
| Apr 25 1995 02:19:01:300PM | 950425020 | Jim Terry | shot 020 Plasma OK, disrupted at 1.25 s. RF power 1.5 and 1.0 MW.
|
| Apr 25 1995 02:19:24:370PM | 950425021 | Jim Terry | shot 021 Plasma OK, disrupted at 1.29 s. RF power 1.0 MW.
|
| Apr 25 1995 03:07:27:220PM | 950425022 | Jim Terry | shot 022 Plasma OK, disrupted at 1.30 s. RF power 1.0 MW.
RF reattaches the divertor. CX shows H/(H+D)~12%. |
| Apr 25 1995 03:07:47:560PM | 950425023 | Jim Terry | shot 023 Plasma OK, disrupted at 1.29 s. RF power 1.0 MW to 1.16 MW.
|
| Apr 25 1995 04:39:37:900PM | 950425024 | Jim Terry | shot 024 fizzle
|
| Apr 25 1995 04:40:51:550PM | 950425025 | Jim Terry | shot 025 Plasma OK, disrupted at 1.30 s. RF power 1.0 MW to 1.16 MW.
McP wavelength possibly screwed up. |
| Apr 25 1995 04:41:21:190PM | 950425027 | Jim Terry | shot 027 Plasma OK, disrupted at 1.30 s. RF power at 1.17 MW.
|
| Apr 25 1995 04:41:38:010PM | 950425028 | Jim Terry | shot 028 Plasma OK, disrupted at 1.31 s. RF power at 1.35 MW.
|
| Apr 25 1995 04:41:50:930PM | 950425029 | Jim Terry | shot 029 Plasma OK, disrupted at 1.32 s. RF power from 1.35 to 1.0 MW.
|
| Apr 25 1995 04:42:10:060PM | 950425030 | Jim Terry | shot 030 Plasma OK, disrupted at 1.32 s. RF power from 1.38 to 1.0 MW.
|
| Apr 25 1995 04:42:24:890PM | 950425031 | Jim Terry | shot 031 Plasma OK, disrupted at 1.32 s. RF power 1.36, 2.3 and 1.0 MW.
|
| Apr 25 1995 04:56:44:510PM | 950425031 | Jim Terry | shot 031 Short H-mode from 1.00 to 1.025 s
|
| Apr 25 1995 04:57:16:720PM | 950425032 | Jim Terry | shot 032 Plasma OK, disrupted at 1.32 s. RF power 1.36, 2.3 and 1.0 MW.
Short H-mode from 1.00 to 1.05 s |
| Apr 25 1995 05:07:36:280PM | 950425033 | Jim Terry | shot 033 Plasma OK, disrupted at 1.29 s. RF power 1.15, 2.5 and 1.35 MW.
Short H-mode from 1.00 to 1.015 s |
| Apr 25 1995 05:12:44:170PM | 950425034 | Jim Terry | shot 034 Plasma OK, disrupted at 1.31 s. RF power 1.13, 2.46 and 1.35 MW.
Very short H-mode at 1.00 s |
| Physics Operator Comments | |||
| Apr 25 1995 07:31:09:890AM | Steve Wolfe | TEXT: Setting up for 950425
Start from PCS$WOLFE:PCS_950425901, produced as folows: Start from 950424007, Ian's last shot from Monday. Copy (IMPORT SEGMENT) segment 2 to segment 3, for future reference Import segment 2 from pcs$wolfe, #950424901; this shot was previously produced by importing 950317024, and incorporating an ef2_by ef4 from 950331038. Reduce ef2_by_ef4 gain to 2 (from 4) Slow down CLEARIN ramp in ramp-down phase. Load into model and save as pcs$wolfe:950425901 Load model at 25-Apr-1995 07:20:14.00 Coldstart successful | |
| Apr 25 1995 07:38:11:200AM | Steve Wolfe | Run plan for 950425
MP#109 - X-point studies SL: Terry PO: Wolfe Start with segment 1 from 950424007. This startup is similar to 950331038, with some tweaks to OH1 voltage, which may want to be undone. Segment 2 is based on 950317024, with an ef2_by_ef4 wire put in with gain of 2, and the clearin rampdown modified as on 950424007. Note that the parent shot was on the EF1 voltage rail; I may need to do tweaking. | |
| Apr 25 1995 07:42:38:840AM | Steve Wolfe | Run plan for 950425 (cont)
Begin the run in H2. H2 ECDC has been run overnight. 1. Get a discharge with the right characteristics. Check outer strike and adjust ZXL to get it on or below probe 7. Set up 25msec Ar puff. 2. Run 4 constatn shots for spectroscopic scan to see H_2 lines 3. Switch back to D2, turn on RF at 0.9sec. Spectroscopy scan for 14 shots. 4. Scan McP across x-point (10 shots). 5. If time permits, scan x-point in R. | |
| Apr 25 1995 08:32:42:600AM | 950425001 | Steve Wolfe | Shot 950425001
Start with the traditional Tuesday morning test OH1 and OH2's look ok. |
| Apr 25 1995 08:46:24:150AM | 950425002 | Steve Wolfe | Shot 950425002
Fill at 1.7e-5Torr, H2 Plasma attempt. Disrupted, right at end of flattop Bad hesitation at 15msec, almost lost it. ECE shows signal across whole chamber, saturates at 22msec Looks like a lot of hards. |
| Apr 25 1995 09:06:22:860AM | 950425003 | Steve Wolfe | Shot 950425003
Raise fill to 2.0e-5 Reduce ZXU to .035 Early disruption. Runaways again. |
| Apr 25 1995 09:15:52:360AM | 950425004 | Steve Wolfe | Shot 950425004
EF4 from -1085 to -1070a Ran, still disrupted at EOF. Still railing EF1's and OH2U Breakdown later |
| Apr 25 1995 09:35:51:940AM | 950425005 | Steve Wolfe | Shot 950425005
Get rid of IP ramp. Change Ip controller beginning at .6 to use TAUOPT=0.3,VWEIGHT=[0.2,0.2,0.5,0.5,3.65,1.05,0.9,0.1,0.1]*1.E3 delay old rampdown controller to 1.4 Still disrupting, this one died earlier, at .91 Looks like lots of injections This may not be a fair test. |
| Apr 25 1995 09:57:00:970AM | 950425006 | Steve Wolfe | Shot 950425006
Drop ZXL from .0125 to .0105 Drop ZCUR from -.01 to -.015 Drop ZXU gain from 9.5 to 4 Disrupted in rampdown 1.16sec. ZXU still out of control. |
| Apr 25 1995 10:13:43:810AM | 950425007 | Steve Wolfe | Shot 950425007
Ar puff to 25msec, and enable B-side lower. Put Ip controller back the way it was, except manually changed OH2 slice to 1.05sec Drop zxu gain to 2.0 Still disrupting on rampdown. Still losing EF1's at .8 sec |
| Apr 25 1995 10:30:27:280AM | 950425008 | Steve Wolfe | Shot 950425008
Ar puff to 35msec Slow down RCUR, ZCUR, CLEARIN on rampdown Disrupted earlier, at 1.02. Halo warning on the way We are losing the lower x-point control when the EF1 rails. |
| Apr 25 1995 10:54:12:100AM | 950425009 | Steve Wolfe | Shot 950425009
Drop ZXU gain to 0. at .76sec Forgot to move the Ar pulse to .3 sec, as requested. Will get it for next time. Still disrupting at 1.07. EF1U now stays well off the rail, current actually turns around at .75, so that wasn't the problem. EF2U goes to zero current at 1.03, and we lose it after EFC goes to zero. |
| Apr 25 1995 11:09:47:350AM | 950425010 | Steve Wolfe | Shot 950425010
Put ZXU gain at 1.0 at .76 sec Move Ar pulse to .3 sec Leave EF2_by_EF4 program high after rampdown. Turn off integral gain on CLEARIN at 1.05sec Fizzle. CII at .008mw/cm2/ster |
| Apr 25 1995 11:29:18:800AM | 950425011 | Steve Wolfe | Shot 950425011
Try again> Put ZXU gain at 1.0 at .76 sec Move Ar pulse to .3 sec Leave EF2_by_EF4 program high after rampdown. Turn off integral gain on CLEARIN at 1.05sec Still disrupting. This one went before EF2 went to zero. OH2L still hard on voltage rail. |
| Apr 25 1995 11:46:04:750AM | 950425012 | Steve Wolfe | Shot 950425012
Get rid of late gas pulse on A-side Bring Ip rampdown back to 1.0sec Short disruptive, lots of hards. lasts till .4 sec, but in trouble from breakdown on. TF crowbar RF boys must go in cell to turn on a NIM crate; now seems a good time. |
| Apr 25 1995 12:22:18:850PM | 950425013 | Steve Wolfe | Shot 950425013
Raise fill to 2.3e-5Torr Disrupted at 1.02 sec again. Another Halo warning, that makes 3 |
| Apr 25 1995 12:29:44:730PM | 950425014 | Steve Wolfe | Shot 950425014
Repeat, without RF firing at the end. I don't think that's it, but we'll find out, maybe. Same thing. It isn't the RF. |
| Apr 25 1995 12:45:57:320PM | 950425015 | Steve Wolfe | Shot 950425015
Get rid of V_oh2U and V_oh2L points at 1sec, + 20V. Lasted till 1.2sec! This one survived the EF2U going to zero current at 1.04sec |
| Apr 25 1995 12:59:50:440PM | 950425016 | Steve Wolfe | Shot 950425016
Go to D2- A-side plenum to 19psi of D2 Leave fill at 2.3e-5 Disrupted at 1.2, like the previous one. Rf at 1.5MW beginning at .9sec |
| Apr 25 1995 01:22:20:190PM | 950425017 | Steve Wolfe | Shot 950425017
Extend Ip flattop back to 1.05sec Raise NL_04 to 1.4 Slow down ramp some more. Still dying around 1.2sec |
| Apr 25 1995 01:27:36:910PM | 950425018 | Steve Wolfe | Shot 950425018
Minor tweak to RCUR rampdown Disrupts at 1.23sec |
| Apr 25 1995 01:48:26:920PM | 950425019 | Steve Wolfe | Shot 950425019
Raise ZXU gain back up to 3. from 0.3 sec on. Ramp ZXL up after 1.05sec Still disrupting around 1.25sec, but this time th eEF2's didn't go to zero. EF1U is back on the rail. |
| Apr 25 1995 02:00:25:270PM | 950425020 | Steve Wolfe | Shot 950425020
Raise RXU gain to 30/sec. (was 12.5/sec) Still disrupting at the same time. According to Rejean, H/(H+D) was .2 on shot 19, .15 on #20 |
| Apr 25 1995 02:14:53:210PM | 950425021 | Steve Wolfe | Shot 950425021
Slow down Ip ramp by removing intermediate points Disrupts at 1.28 sec. |
| Apr 25 1995 02:26:38:490PM | 950425022 | Steve Wolfe | Shot 950425022
Small tweak to CLEARIN rampdown (less negative) No difference |
| Apr 25 1995 02:38:11:910PM | 950425023 | Steve Wolfe | Shot 950425023
Increase RCUR rampin by about a factor of 2 No change. still disrupts at 1.25sec |
| Apr 25 1995 03:02:30:460PM | 950425024 | Steve Wolfe | Shot 950425024
No change. See if it evolves at all on its own Fizzle. So much for leaving things alone! Late bd - 8.1msec. Previous one was fine. Repeat and see if it comes back. |
| Apr 25 1995 03:13:09:200PM | 950425025 | Steve Wolfe | Shot 950425025
Repeat and see if it comes back. It did. BD at 6msec, pretty good current rise. Still disrupting at 1.28 |
| Apr 25 1995 03:35:07:970PM | 950425026 | Steve Wolfe | Shot 950425026
No changes Ran ok, still disrupts at 1.29 Barolo hung up on this one with no pagefile. Granetz has been evicted. |
| Apr 25 1995 03:39:18:040PM | 950425027 | Steve Wolfe | Shot 950425027
No changes Hangin' in there. |
| Apr 25 1995 03:59:37:370PM | 950425028 | Steve Wolfe | Shot 950425028
Ramp CLEARIN in faster after 1.2sec Breakdown was not so good on the last one, slow current rise and bounces at 28msec. Nothing obviously wrong with the fields. Leave it alone and see if it improves. It looks pretty similar, maybe 10msec longer. BD looks better. No bounce and a tad earlier. |
| Apr 25 1995 04:04:28:120PM | 950425029 | Steve Wolfe | Shot 950425029
No changes. Same. JT and BLIP are continuing the spectroscopy scan. |
| Apr 25 1995 04:17:40:120PM | 950425030 | Steve Wolfe | Shot 950425030
Ramp CLEARIN in hard after 1.2sec. Essentially the same. Ian thinks the disruption may be due to a vertical instability that begins at a gain switch on the slow ZCUR. |
| Apr 25 1995 04:36:25:790PM | 950425031 | Steve Wolfe | Shot 950425031
Get rid of the switches on slow ZCUR gains in rampdown Disrupts at 1.318sec this time. Not much difference. Still vertically unstable. |
| Apr 25 1995 04:48:44:190PM | 950425032 | Steve Wolfe | Shot 950425032
Reduce rampin of RCUR during rampdown. No change in disruption time. |
| Apr 25 1995 04:56:18:950PM | 950425033 | Steve Wolfe | Shot 950425033
Ramp CLEARIN faster by removing point at 1.2 sec Disrupted at 1.28, slightly earlier |
| Apr 25 1995 05:10:14:890PM | 950425034 | Steve Wolfe | Shot 950425034
Ramp CLEARIN in slower and hold it out longer. This will be the last shot today Disruption is at 1.318, like the earlier ones. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:29:31:250AM | Test | Ok | oh coax test |
| 2 | 08:38:07:740AM | Plasma | Ok | no faults |
| 3 | 08:54:24:690AM | Plasma | Ok | |
| 4 | 09:09:48:340AM | Plasma | Ok | |
| 5 | 09:27:33:660AM | Plasma | Ok | |
| 6 | 09:43:45:780AM | Plasma | Ok | oh2l fault late in the shot |
| 7 | 10:04:16:960AM | Plasma | Ok | |
| 8 | 10:20:25:480AM | Plasma | Ok | |
| 9 | 10:43:10:230AM | Plasma | Ok | |
| 10 | 11:02:14:490AM | Plasma | Ok | |
| 11 | 11:12:13:720AM | Plasma | Ok | |
| 12 | 11:35:12:190AM | Plasma | Bad | tf crobar |
| 13 | 12:12:29:190PM | Plasma | Ok | |
| 14 | 12:24:06:110PM | Plasma | Ok | |
| 15 | 12:38:45:220PM | Plasma | Ok | |
| 16 | 12:55:22:900PM | Plasma | Ok | |
| 17 | 01:07:46:750PM | Plasma | Ok | |
| 18 | 01:24:51:230PM | Plasma | Ok | |
| 19 | 01:39:42:210PM | Plasma | Ok | |
| 20 | 01:52:26:390PM | Plasma | Ok | No Faults. |
| 21 | 02:03:14:360PM | Plasma | Ok | No faults. |
| 22 | 02:19:45:390PM | Plasma | Ok | No Faults. |
| 23 | 02:32:02:380PM | Plasma | Ok | No Faults. |
| 24 | 02:51:34:050PM | Plasma | Ok | No Faults. |
| 25 | 03:06:55:330PM | Plasma | Ok | No Faults. |
| 26 | 03:16:23:750PM | Plasma | Ok | No Faults. |
| 27 | 03:36:28:160PM | Plasma | Ok | No Faults. |
| 28 | 03:51:12:580PM | Plasma | Ok | No Faults. |
| 29 | 04:01:38:910PM | Plasma | Ok | No Faults. |
| 30 | 04:14:06:470PM | Plasma | Ok | No Faults |
| 31 | 04:26:30:960PM | Plasma | Ok | No Faults. |
| 32 | 04:41:48:220PM | Plasma | Ok | No Faults. |
| 33 | 04:52:55:780PM | Plasma | Ok | No Faults. |
| 34 | 05:04:50:960PM | Plasma | Ok | No Faults |