| Miniproposals | ||||||||||||||
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| Operators | |
| Session leader(s): | Greg Wallace,Ron Parker,Ron Parker,Orso Meneghini,Greg Wallace |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Andy Pfeiffer,Bill Cochran,Gary Dekow |
| Engineering Operator Run Comment |
| MP:515 Effect of launched nll spectrum on current profile (Continued) MP |
| Session Leader Plans |
| Entered: Apr 1 2008 05:16:42:677PM |
| Author: Ron Parker |
| Session Leader Plan for 1080402
(Copied from 1080401) ------------------------------------ MP:515 Effect of launched nll spectrum on current profile (Continued) MP:542a Density Gradient From LH Langmuir Probes Measurements (Partial) MP:544 Optimizing LHCD in "improved L-Mode Scenarios" (Partial) Session Leader: R. Parker (A. Hubbard for MP 544) Physop: E. Marmar Engineering Setup ----------------- Run begins at ****08:00**** and ends at 17:00 Power systems as on: 1080320002 Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid Enabled Gas setup: Fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled(PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) leave NINJA as is DISABLED Enable gatevalves and shutters: ECE, VUV, DNB, Z-bolo Torvac gatevalve toggle (yes/no): NO All "standard" diagnostics (e.g., Thomson and ECE) are needed, and MSE is crucial. Boronization(yes/no): no Overnight ECDC (yes/no): YES ICRF(yes/no): YES, later in the run (J-port only) LH(yes/no): YES DNB(yes/no): YES Cryopump (yes/no): YES, later in run if no leak Vessel temperature: 35/35/35 ------------------------------ ECDC Parameters (overnight) ------------------------------ gas and pressure: D2 at 2e-4 Torr sweep: 44/45/103 cm scan: 20/120 s Goals: 1.) Explore efficacy of exciting 16 waveguides of LH grill (which configuration is best, left 16, middle 16 or right 16?) 2.) Check assumptions made in MP 542a, regarding scrape-off length inside LH limiter. 3.) MSE profile measurements for 60, 75 and 90 phasing with 1-2 MW ICRH from J-port. 4.) Fill in LHCD current profiles (MSE) for 90 and 120 degree phasing (Virulent MHD again?)Ohmic only. Approach: First 2 hours will be devoted to checking efficiency of LHCD with only 16 waveguides excited, in sequence left 16, middle 16 and right 16. The results will be useful in defining configuration of waveguide feeds for this coupler when new coupler is installed. Then, we'll run up to 2-8 shots for MP542a, the first 2-4 checking assumption of equal probe signals when the launcher and LH limiters are congruent with the plasma shape. If assumption is verified, we'll run up to 4 shots with different plasma shape in order to estimate the density gradient in front of LH limiters. Next, we'll check if MHD reappears under conditions similar to 1080320020 and higher. If so, we'll increase density to get rid of MHD and make MSE profile measurements for 90 and 120 degree phasing. Finally, we'll begin applying 1-2 MW of ICRH to see if current profile can be modified by damping the LH waves at higher Te. |
| Physics Operators Plans |
| Entered: Apr 1 2008 05:27:16:957PM |
| Author: Steve Wolfe |
| Physop plan for Wednesday, April 2, 2008
Start with a few reconditioning, recovery discharges then if this is successful: MP#515, 542a, 544 SL: Parker PO: wolfe ----------------- Engineering Setup ----------------- Run begins at 09:00 and ends at 17:00 (with possible extension to 18:00, if allowed). Power systems as on: 1080401001 Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid Enabled Gas setup: Fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid DISABLED (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill NINJA with 10 psi D2 DISABLED Enable gatevalves and shutters: ECE, VUV, DNB, Z-bolo Torvac gatevalve toggle (yes/no): no Boronization(yes/no): no Overnight ECDC (yes/no): no ICRF(yes/no): yes, later in run J-port only LH(yes/no): yes DNB(yes/no): yes Cryopump (yes/no): YES, later in run Vessel temperature: 35/35/35 ------------------------------ ECDC Parameters (if requested) ------------------------------ gas and pressure: D2 at 2e-4 Torr sweep: 44/45/103 cm scan: 20/120 s This will be a multipurpose run, based on the plan originally submitted for Tuesday 1080401 0.) Follow up on machine reconditioning as on 1080401040, raise current to 800kA, monitor Mo, F, etc. 1.) Explore efficacy of exciting 16 waveguides of LH grill (which configuration is best, left 16, middle 16 or right 16?). This should take about 2 hours, and a couple of cell accesses. 2.) Check assumptions made in MP 542a, regarding scrape-off length inside LH limiter. Use shot like 1070413005 (updated for repaireds flux loops) for balanced flux at the LH probes. 3.) MSE profile measurements for 60, 75 and 90 phasing with 1-2 MW ICRH from J-port. Use shape like 1080320018 but at 5.4T (800kA) 4.) Fill in LHCD current profiles (MSE) for 90 and 120 degree phasing (Virulent MHD again?)Ohmic only. For this part of the run, we will go up to 6.2T. |
| Session Leader Summaries |
| Entered: Apr 2 2008 06:04:37:357PM |
| Author: Ron Parker |
| Session Leader Summary
The run had four objectives: 1.) Explore efficacy of exciting 16 waveguides of LH grill (which configuration is best, left 16, middle 16 or right 16?) 2.) Check assumptions made in MP 542a, regarding scrape-off length inside LH limiter. 3.) MSE profile measurements for 60, 75 and 90 phasing with 1-2 MW ICRH from J-port. 4.) Fill in LHCD current profiles (MSE) for 90 and 120 degree phasing (Virulent MHD again?)Ohmic only. The first two were well achieved, while the 3rd was only partially met with ICRH limited to 1 MW. Regarding item 1 (Shots 1-9): There seemed to be little difference regarding which set of 16 waveguides were excited; if any difference was noted it was slightly better current drive produced by the 16 waveguides nearest B port. This result is important for Phase II, when the new coupler is added and the complement of klystrons exciting the existing antenna is reduced to 8. It indicates that the choice of which klystrons to leave energizing the present grill cab be made on the basis of convenience, and that it should not be necessary to balnk off unused guides. Regarding item 2 shots(10-14): Probe measurements were made with the coupler in two positions relative to the fixed LH limiters, and for 2 different plasma shapes, one congruent to the plasma shape, the other strongly non congruent. The results seemed to be at variance with previous studies, but need analysis before conclusons can be drawn. Regarding item 3 (Shots 15-36): Systematic MSE measurements of LHCD were carried out for the 3 phasings, but only at the 1 MW level. Thus this part of the goal was achieved. The first attempt to couple 2 MW into an upper null configuration resulted in an early disruption, after which the recovery took 1 shot. However, shot 34 was successful, as 2 MW was coupled from J-port with 900+ kW LH and 75 deg phasing (low reflection coefficient!). Unfortunately, the shot disrupted at 1.27 s and the next 2 shots fizzled, ending the run. Regarding item 4: This was not accomplished due to lack of time. Perhaps there will be another opportunity, although with the backed up log of high priority MP's, it may not be possible. |
| Physics Operator Summaries |
| Entered: Apr 2 2008 06:53:03:640PM |
| Author: Steve Wolfe |
Physop summary for Wednesday, Apr 2, 2008
MP#515, 542a, and a little bit of 544; plus LH engineering tests
SL: Parker, Wallace, Meneghini, and an uncredited cameo by Hubbard
PO: wolfe
EO: Pfeiffer, Cochran, Dekow
A nine hour run with a lot of goals, many of which were actually
accomplished. The goals were:
0.) Follow up on machine reconditioning as on 1080401040,
raise current to 800kA, monitor Mo, F, etc.
1.) Explore efficacy of exciting 16 waveguides of LH grill (which configuration is best, left 16, middle 16 or right 16?). This should take about 2 hours,
and a couple of cell accesses.
2.) Check assumptions made in MP 542a, regarding scrape-off length inside LH limiter. Use shot like 1070413005 (updated for repaireds flux loops) for
balanced flux at the LH probes.
3.) MSE profile measurements for 60, 75 and 90 phasing with 1-2 MW ICRH from J-port. Use shape like 1080320018 but at 5.4T (800kA)
4.) Fill in LHCD current profiles (MSE) for 90 and 120 degree phasing (Virulent MHD again?)Ohmic only. For this part of the run, we will go up to 6.2T.
The first order of business was to get plasmas back
after last Wednesday's disaster and yesterday's struggles. This was
accomplished quickly, although it turns out we still have a major problem
with disruption recovery, and there is still a lot of fluorine around.
We finished the engineering tests with 16 wg's powered by 8 klystrons
without too much trouble by about 11AM, including cell accesses to
change the configuration. These tests were successful. We had one
early disruption during this sequence, but the next ran ok.
The proof-of-principle test for MP#542a on using the probes to measure
density gradients was completed (with another cell acess to move
the launcher) between shots#10-14. The changes from the low triangularity
case that matched the probe flux to the JFT2-M shape that gave maximum
flux difference showed very big differences in evolved flourine, from
spectroscopic measurements and M49 (BF2) on the RGA. The M49 tracked
the variations of M32 (B2D6), which indicated that the source of BF2 is
basically wherever the boron is. It seems that whenever we heat up a
new surface we evolve more fluorine, and eventually clean it off. We made
it through this part of the run with no major disruptions, except for
the shorty on #6.
Unfortunately, once we started the ICRF portion of the day, our luck ran
out. Shot#16 disrupted due to ICRF pickup in the EF2 control circuits,
a problem we have encountered before. Bill found the door of the TMX
cabinet was ajar, and once this was closed properly that problem did not
recur. However, the disruption raised the mass 49 peak to 1.5e-7, an
order of magnitude higher than it had been up to that point, and it
took five fizzles before we got another plasma. We muddled through
getting the LSN phase scan with and without ICRF, comleting this portion
of the experiment at shot#31.
The final portion of the experiment was upper null at higher power,
still part of goal 3 but also of interest to Amanda's MP#544. The
upper null seems to need more conditioning to handle the 2+ MW called
for in these shots, and we got 2 disruptions and 3 fizzles the rest of
the way. Shot#34 kindly waited until after the LH pulse to disrupt, so
some useful data may have been obtained on that one. We tried to get one
more, but the next 2 fizzled, so we failed to leave a good one on the drum.
We never got to using the cryopump, or to running higher field for
improved accessibility (part 4).
Operationally, the machine is capable of running but still needs more
conditioning to fully recover from whatever happened last week. Mass 49
on the RGA seems to be a good indicator both of clean-up progress in a
given configuration and startup futility. The lowest partial pressure of 49
at which I was able to get startup was around 1.5e-8. For that high
a value it was necessary to drop pg4 to 20msec, and run rcur offset at 1000.
While things were going well, and the mass 49 was down in the low to mid
e-9 range, it was better to run pg4 in the 25-29msec range, and rcur offset
to 1800, to avoid early runaways. In terms of the mass 49 peak, the worst
disruptions today were at 1.5e-7, about half the levels encountered most
of the day yesterday.
We had one non-counted no power shot (should have been #29) due to a
data system problem. Otherwise, aside from the TMX pickup problem
that led to a disruption there were no major tokamak system problems
today. The first cell accesses were relatively quick and painless, but
the last one required a long delay waiting for the O2 to come up.
Scorecard:
Duds 0
Fizzles 9
Plasmas 27 (2 early disruptions, 3 flattop disruptions)
======== ===
Shots 36
|
| Session Leader Comments | |||
| Apr 2 2008 09:05:28:980AM | 1080402001 | Ron Parker | Good start! Shot 1 ran well and LH coupled 350 kW for short pulse.
Too short for current drive. Next: 800 kA, longer LH pulse, higher power. |
| Apr 2 2008 09:05:53:513AM | 1080402001 | Ron Parker | First shot coming up, fingers crossed. |
| Apr 2 2008 09:24:15:870AM | 1080402002 | Ron Parker | Shot 2 ran well @ 800 kA but LH tripped on HV fault.
Test shot ran OK, so try again. |
| Apr 2 2008 09:37:15:543AM | 1080402003 | Ron Parker | Shot 3 ran full length and ~ 450 kW LH coupled w/o dropout.
Next: Move power up to ~ 700 kW. |
| Apr 2 2008 09:58:30:013AM | 1080402004 | Ron Parker | Shot 4 was fine, full length as was the LH pulse. ~ 700 kW coupled, sufficient for this configuration.
We had a cell access to change LH group to middle set. |
| Apr 2 2008 10:19:55:637AM | 1080402005 | Ron Parker | Shot 5 looked good, ~ 450 kW coupled, no faults, 0.2 V drop in Vloop.
Next: Raise LH power to 700 kW. |
| Apr 2 2008 10:21:17:183AM | 1080402006 | Ron Parker | Ooops, shot 6 disrupted early -- like yesterday. Let's hope that we aren't back to yesterday's problem! |
| Apr 2 2008 10:48:58:090AM | 1080402007 | Ron Parker | Perfect! Shot 7 ran full length and LH pulse was sufficient for the purpose. |
| Apr 2 2008 11:11:22:857AM | 1080402008 | Ron Parker | Shot 8 ran well, data collected for middle set of 16 couplers @ ~470 kW.
Next: 700+ LH kW, is successful, we'll move on to a few shots for Orso and Syunichi. |
| Apr 2 2008 11:18:18:497AM | 1080402009 | Ron Parker | Shot 9 ran well, LH power uninterrupted @ just under 800 kW.
Tentative conclusion: All 3 groups of 16 waveguides performed at nearly the same level at the same power. Slight edge to operation with set adjacent to B port (in terms of delta V.) We're ready to move to the next MP, 542a and there will be a short delay for cell access to rewire klystrons to 22 waveguides for later use, and for moving LH coupler back from limiters. First we'll have a shot or 2 to check scrapeoff inside LH limiters, plasma congruent with LH limiters, then a shot or 2 with strong shape mismatch between LH limiters and plasma. |
| Apr 2 2008 11:38:19:903AM | 1080402010 | Ron Parker | Shot 10 ran OK, although there were injections, reportedly Cu.
Run this shot one more time, hopefully w/o injections. |
| Apr 2 2008 11:41:39:903AM | 1080402010 | Orso Meneghini | Starting from reference shot 1070413005 which should put all the LH probes on very close flux surface.
The probes positions when projected on the midplane are indeed very close (+-1mm max deviation), also the measured densities tend to be the same (within a factor of two). Moreover D and B probes show the same densities. Since there were two copper injections we are going to repeat the shot. |
| Apr 2 2008 11:49:05:323AM | 1080402011 | Orso Meneghini | Good shot, no injections.
Next shot we will use as reference shape the shot number 1080108008, which should maximize the midplane distance of the probes. |
| Apr 2 2008 12:05:29:670PM | 1080402012 | Orso Meneghini | Good shot.
We will have cell access to move the LH launcher flusced to its own limiter. Next shot we will use again the shape matching the midplane probes position (basically repeating shot 1080402011). |
| Apr 2 2008 12:27:38:997PM | 1080402012 | Ron Parker | Shot 12 ran full length, probe data collected for shape different than LH limiter.
Shot 13: same as shot 11, but LH grill will be pushed in flush with LH limiters. Waiting for O2 level to increase for cell entry. |
| Apr 2 2008 12:41:22:573PM | 1080402013 | Orso Meneghini | Good shot.
Next shot we will use again the shape maximizing the distance of the probes on the midplane (basically repeating shot 1080402012). |
| Apr 2 2008 12:50:23:780PM | 1080402014 | Orso Meneghini | Good shot. |
| Apr 2 2008 12:52:46:357PM | 1080402014 | Ron Parker | Shot 14 ran well. This completes data collection for the second task for this run day.
Next: Couple ICRH into L-modes with LHCD, measure jphi with MSE. Greg taking over. |
| Apr 2 2008 12:59:41:450PM | 1080402015 | Greg Wallace | Moving along to the main event of the day. No RF drive because Python crashed on this shot. Will repeat for next shot with 150kW per klystron. |
| Apr 2 2008 01:27:44:013PM | 1080402016 | Greg Wallace | Trips from 17 top (first) and 10 bottom (second). Maybe arcs??? Will turn down power a bit and see if the problems go away. Density looks good at grill, coupling is around 25% runtil trips.
Steve Wolfe indicates that disruption was caused by ICRF pickup on control coil power supply. |
| Apr 2 2008 01:45:30:810PM | 1080402017 | Greg Wallace | Fizzle. |
| Apr 2 2008 01:45:36:607PM | 1080402018 | Greg Wallace | Fizzle again. |
| Apr 2 2008 02:45:04:060PM | 1080402022 | Greg Wallace | Arcing in 10 bottom seems like it caused most of the trips. Moving down to 110kW on klystron 5. Also turning off ICRF to see if we can get a cleaner baseline. |
| Apr 2 2008 02:54:39:717PM | 1080402023 | Greg Wallace | Much better coupling with no ICRF. One arc on 10 bottom but will turn down klystron 5 a bit more to 100kW. ICRF will be back for next shot. |
| Apr 2 2008 03:03:45:620PM | 1080402024 | Greg Wallace | Nice shot at 90 degrees, no trips. Will move on to 75 degrees with same plasma and ICRF conditions. |
| Apr 2 2008 03:21:09:280PM | 1080402025 | Greg Wallace | Good shot at 75deg with 1MW ICRF. Will repeat without ICRF for next shot. |
| Apr 2 2008 03:30:48:670PM | 1080402026 | Greg Wallace | Another clean shot with no ICRF at 75 degrees. Next shot will turn ICRF back on and go to 60 degrees. Will also try to keep density down to 4.5e19 to keep waves accessible. |
| Apr 2 2008 03:49:10:323PM | 1080402027 | Greg Wallace | Trip on 5 top. Coupling not so great at this phasing. Next shot will try to decrease the density a little bit, keeping LH and ICRF the same. |
| Apr 2 2008 04:01:33:873PM | 1080402028 | Greg Wallace | Disruption at 0.25s. |
| Apr 2 2008 04:42:53:340PM | 1080402030 | Greg Wallace | Good shot at 60 degrees, will try again without ICRF for comparison. Will raise the programmed density a bit due to lack of ICRF on next shot. |
| Apr 2 2008 04:55:52:670PM | 1080402031 | Greg Wallace | Good shot at 60 without ICRF. Similar density to shot 30. Next shot will go to upper null, 2MW ICRF, 75 degrees. |
| Apr 2 2008 05:05:01:840PM | 1080402032 | Greg Wallace | Disruption at 0.65s. |
| Apr 2 2008 05:17:30:090PM | 1080402033 | Greg Wallace | Fizzle. |
| Apr 2 2008 05:37:15:787PM | 1080402034 | Greg Wallace | Plasma disrupts at 1.2s. Trips due to 10 bottom, looks like an arc again. Turning down klystron 5 to 90kW. |
| Apr 2 2008 05:43:33:010PM | 1080402035 | Greg Wallace | Fizzle. |
| Apr 2 2008 06:01:48:140PM | 1080402036 | Greg Wallace | Fizzle. |
| Physics Operator Comments | |||
| Apr 2 2008 08:49:42:310AM | Steve Wolfe | Note that the TF limit is presently at 165kA. If we get as far as step 4, then I need to remember to increase this to 175kA for 6.2T operation. | |
| Apr 2 2008 08:39:20:510AM | 1080402001 | Steve Wolfe | Setting up for first shot. This will be a straight repeat of 1080401040, 650kA, 4e19, 5.4T, LSN (segment 2). If this is successful, we'll raise the current to 800kA, and perhaps bump the density up to 5e19. That should be a decent target for the 16 waveguide tests over the first hour or so. Seg1 presently has rcur offset=1000, br_0=-.0005, ic_ef4U=-1355 pg4=21msec. I expect to be tuning the startup, with special attention to avoiding early runaways if possible. We will need to monitor the 49 peak on the RGA, and Matt will be looking at F lines on chromex, I hope. Mass 49 is presently below 1e-9 on the RGA. Load at 2-Apr-2008 08:27:43.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done |
| Apr 2 2008 09:06:19:827AM | 1080402001 | Steve Wolfe | Shot#1: plasma full length, with LH. Are we done yet? No early runaways. Lots of small injections throughout. Startup has a hesitation, starts to move in. Density overshoots to 5.5e19, then drops to 4e19. CIII at breakdown is <.004. After shot, mass49 is 4e-9 on RGA. Next: raise Ip to 800kA |
| Apr 2 2008 09:15:16:700AM | 1080402001 | Steve Wolfe | The TF fast ground fault indication came up on the PLC on or after shot#1. Nothing visible on the traces. Short delay while we think about it. Turns out the indicator came up on a power glitch this morning at about 7:30, PLC screen wasn't cleared. |
| Apr 2 2008 09:22:36:323AM | 1080402002 | Steve Wolfe | Shot#2: raise Ip to 800kA, I'm tempted to reduce fill, but leave it for now, see what happens. plasma full length, looks like runaways early. slight bounce in startup. Pressure dropped by about .01mTorr from shot#1, probably because DNB gate valve opened this time. Otherwise, shot looks ok. Still getting some injections. Loop voltage is 1V; no LH. Mass 49 ~4e-9; RSView trending seems to be broken since 3AM this morning, Joe is working on it. CIII at bd <.002 Next: raise pg4 and repeat. |
| Apr 2 2008 09:34:02:513AM | 1080402003 | Steve Wolfe | Shot#3: raise pg4 from 22 to 24msec and repeat. plasma, full length, got LH that time. Loop voltage drops .2 or so, density up a tad. No early runaways this time, maybe a small bounce CIII<.002 again. On last pulse Matt said F is lower than yesterday, higher than normal. Mass49 after pulse up to 7e-9 or so; Joe says RSview is transmitting now, but MdsPlus isn't getting the trends. Next: repeat |
| Apr 2 2008 09:45:30:793AM | 1080402004 | Steve Wolfe | Shot#4: repeat Noticed that the NL04 feedback has derivative gain turned on, haven't a clue why. There's fuzz on the Mout trace. Plasma full length. got LH ok. Cell access for LH to change which guides they're powering. Clean startup again, CIII peaks at ~.0025mW/cm^2/ster. Mass 49 > 1e-8 after the shot, it's clearly getting worse. Next: No pcs changes. |
| Apr 2 2008 10:09:07:933AM | 1080402005 | Steve Wolfe | Shot#5: repeat While they're in the cell, start setting up seg4 for 1070413005 for part 2 of today's run; will need to recalc mag predictors. Import seg2 This is an 800kA, nl=3e19, LSN with RXU~+0.025 Recalc seg4 (still off) and load No changes in active segments, LH now powering the other side of the grill. Slight bounce in startup, LH ran ok, There was a slight miscommunication so the engineers turned excitation on in INIT, and then went to check. Fired pulse before the countdown on my instruction, because I thought the check transition had happened and the voice update was just slow. Everything ran ok. Mass 49~ 7e-9 after pulse, CIII has double spike up to .003 Next: raise pg4 2msec |
| Apr 2 2008 10:27:12:060AM | 1080402006 | Steve Wolfe | Shot#6: raise pg4 24 to 26msec Short plasma, disrupts at .165, had some early runaways Might be a big injection, but this looks a lot like the first 8 hours of yesterday. Mass 49 gets to 1e-8, CIII in bd looks ok <.003 but with a spike at 0.010 sec. Note that current program is at 400kA at 0.1sec, so we've been overshooting. There is a little runaway dump then. Raise this to 550k for next shot. Leave Pg4 at 26msec, expect a fizzle. |
| Apr 2 2008 10:36:37:810AM | 1080402007 | Steve Wolfe | Shot#7: Leave pg4 at 26msec, expecting a fizzle in any case. raise ip point at 0.1sec to 550kA plasma full length, one trip on lh but they'll take it. CIII flat ~0.003 in startup, never burns out. Current gets to ~560 at 0.1sec, a little slower than it's been on earlier shots; first 50msec looks clean, no obvious bounce. Runaways kick up in rampdown, maybe had an injection then. Cell access to move drive to center 16 guides. No PCS changes for next shot. |
| Apr 2 2008 10:49:56:670AM | 1080402008 | Steve Wolfe | Shot#8: move LH drive to center 16 guides. No PCS changes plasma with some early runaways. looks like rf ran ok. One early bounce, need to keep after that. Had a CIII spike at 11 or 12msec, at the bounce. Ip @0.1 = 570kA, a bit better. Next: raise pg4 again, increase rcur offset. |
| Apr 2 2008 11:03:58:043AM | 1080402009 | Steve Wolfe | Shot#9: raise pg4 26 to 29msec, rcur offset from 1000 to 1800 plasma full length, no early runaways Injection at beginning of LH pulse, but it seemed to run. CIII<.0025 in bd, decent burnout. No bounce, moves out slower than previous. That completes the 16 waveguide tests. Next: Cell access to move launcher for MP#542A, reconnect all guides at the same time. Switch to seg 4 for PCS setup. |
| Apr 2 2008 11:32:50:747AM | 1080402010 | Steve Wolfe | Shot#10: Cell access to move launcher for MP#542A, reconnect all guides at the same time. Beginning MP#542A portion of the run, balanced flux at LH probes. Switch to seg 4 for PCS setup: seg2 off, seg4 on. Verify that the import from seg2 of 1070413005 was the correct setup. Note that this is set for 152kA TF, leave it. Raise nl04 to 5e19 They will also want 1080108008 (a JFT2-M shape). That doesn't need any recalculation. Import seg2 of 1080108008 to seg3, leave off. Note that Jason's dpcs_ftae2 is still on from yesterday. Should have been turned off, but now he'll start using it. I REALLY need to change the PCS interface so the physop can see what's been left lying around! Load at 2-Apr-2008 11:20:27.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Plasma full length, looked like a flash on inner wall part way through Two big injections, at 0.85 and 1.1sec. Gaps look ok, not sure what happened then, bites out of Te, Vl. See debris rotating around inner wall on wide2 view. Rachel says copper. Maybe we've burned through the insulation and are down to the wire (so to speak). |
| Apr 2 2008 11:45:19:247AM | 1080402011 | Steve Wolfe | Shot#11: repeat and hope the injections go away. No PCS changes. plasma full length, no rotating junk on inner wall, still have some spikes on the bolo, and negative spikes on the Halpha. Startup looks ok, no bounce, still moving out slowly. CIII<.0025. M49 quite large, up to 1.5e-8 Next: JFT2-M shape. |
| Apr 2 2008 12:06:41:637PM | 1080402012 | Steve Wolfe | Shot#12: JFT2-M shape. Copy nl04 from seg4 to seg3. Seg 4 off, seg3 on. This was 900kA shot, reduce to 800kA. No seg 1 changes. Note that pressure was up a little last shot, to .08mTorr. Vessel temp is down to 17C, need to watch it. Mass 49 is up to 6e-9 before INIT, higher than for last few shots. Load at 2-Apr-2008 11:49:00.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done plasma full length, no runaways, only two injections (.6 and .8sec) but some early prad before 0.3sec. Looks like JFT2-M all right. Startup still looks ok. CIII<.003. Biggest Mass 49 spike today, over 4e-8! Matt confirms that F line is higher by factor of 2 over #11. Next: Cell access to move launcher forward (flush with limiter). |
| Apr 2 2008 12:36:11:153PM | 1080402013 | Steve Wolfe | Shot#13: Back to "matching shape" from seg4. Seg 3 off, seg 4 on, should be like #11. Load at 2-Apr-2008 12:09:36.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Sue will also go into cell to open LHe valve for cryopump, in case we want it later; actually it was already open. This could be last cell access today, and it's taking a long time to get the O2 level up. The mass 49 peak is evolving in a non-uniform way as we wait for the cooling to catch back up. Now down to 4e-9, seemed to drop when magnet cooling was turned back on full after seeming to plateau at 1e-8. Similar behavior on mass 32 (B2D6). In recool 36 minutes for that access before going to INIT. plasma full length. No hards. Faster step out in startup, and CIII is up to .005, highest today. Still a couple of small early injections. Shape looks good. Mass 49 after pulse is only a little over 1e-8 in the peak, much lower than after 12. Next: Back to JFT2-M shape. |
| Apr 2 2008 12:50:17:717PM | 1080402014 | Steve Wolfe | Shot#14: Back to JFT2-M shape. Seg 4 off, seg3 on No seg 1 changes. Load at 2-Apr-2008 12:36:45.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done plasma full length, no runaways, CIII<.004 in bd. JFT2-M shape looks good. Injections at .13 and 1.07sec, not a big perturbation on anything but bolo. Mass 49 has a big spike again, up to 3.5e-8, similar to 12 but a little less. That completes today's mp542a shots. Moving on to MP515. |
| Apr 2 2008 01:01:24:637PM | 1080402015 | Steve Wolfe | Shot#15: Moving on to MP515. Turn off seg3 and turn seg2 back on. This shot will have LH again. ICRF on following shot Reduce argon puff to 100msec and enable Load at 2-Apr-2008 12:55:02.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Plasma full length, no lh - Python problem, whatever the hell that means. No runaways, CIII up a little, to .005 in bd. getting a little pause in rampout between .01 and .02. Negligible increase on mass49 during pulse. Could be interpreted as meaning that this shape has cleaned up the surfaces it touches? Next: try again for LH, also ICRF I assume. |
| Apr 2 2008 01:28:44:077PM | 1080402016 | Steve Wolfe | Shot#16: try again for LH, also ICRF I assume. No pcs changes Disruption at .96sec, during the ICRF pulse. LH was faulting at the time. Looks like the EF2 pickup problem again. I see a greater than saturating value on the EF2U demand starting at .943sec, with no corresponding change on the DPCS M-out. Similar a little later on EF2L. That one got mass 49 up to 1.5e-7. Next: repeat, with no change, expecting a fizzle after that disruption. |
| Apr 2 2008 01:40:46:763PM | 1080402017 | Steve Wolfe | Shot#17: try again for LH, also ICRF I assume. No pcs changes, since dropping the fill could give runaways. Just take the fizzle and hope for the future. fizzle, essentially no current. The good news is there's also no CIII light (none at all, maybe it's not such good news?) I think this one is just going to have to clean out. M49 is still up at 4e-8, and order of magnitude higher than before most shots today. Next: no pcs changes. Probably get another fizzle, based on m49 and 32 levels |
| Apr 2 2008 01:46:59:450PM | 1080402018 | Steve Wolfe | Shot#18: no pcs changes. Probably get another fizzle, based on m49 and 32 levels Mass 49 DOWN to 2e-8 going to INIT; that's higher than any shot today. Bill has closed the door on the EF2 TMX's again, it was ajar (done before shot 17). Another fizzle. Similar startup, or lack thereof. No current rise, just a hint of CIII light. If the next one doesn't go, I'll consider dropping pg4. M49 and M32 still around 2e-8 after pulse. |
| Apr 2 2008 02:07:06:950PM | 1080402019 | Steve Wolfe | Shot#19: no pcs changes. M49 is down to about 1e-8, still a factor of 2 higher than for any successful startup today. Another fizzle. CIII is up to .005, almost no current. |
| Apr 2 2008 02:10:54:543PM | 1080402020 | Steve Wolfe | Shot#20: Drop pg4 by 2msec, 29 to 27ms, see if we can help it a little M49 is still around 9e-9, higher than any startup today. Another fizzle, we're back to yesterday CIII now at 0.01, really like yesterday. Still almost no current. Drop pg4 again, and hope we don't get bad runaways. |
| Apr 2 2008 02:25:14:043PM | 1080402021 | Steve Wolfe | Shot#21: Pg4 from 27 to 23msec M49 and M32 are hanging around at the 1e-8 level, not really dropping anymore. We did have shots at this level or a bit higher yesterday (#39 and 40),with about this puff level. Earl was right that disruption recovery is still a major problem. Another fizzle, maybe stronger, seems to have hit something at about 13msec, while moving in. CIII around 0.009. still not much current. Next: drop rcur offset, down a little more on pg4. |
| Apr 2 2008 02:43:56:827PM | 1080402022 | Steve Wolfe | Shot#22: Pg4 from 23 to 20msec; rcur offset from 1800 to 1000 Now the startup is back to what worked yesterday, except slightly lower puff. I think Br_0 could be more positive, but leave it since this worked yesterday. plasma full length with LH and maybe ICRF (wait and see) There was a big injection at .87 that takes a bite out of the current. Startup looks decent, no obvious bounce, CIII<.006 LH kicks up huge tail, neuts/hards ~3e14 just before (during) the injection. ICRF flat at 1.2MW, LH faulting around 600kW. Mass 49 peaks at 1.4e-8 and drops back. Probably no harm done. next: repeat |
| Apr 2 2008 02:52:20:107PM | 1080402023 | Steve Wolfe | Shot#23: repeat with ICRF off (baseline), hope the injection goes away plasma full length, small early runaways. Looks like the LH trips once at 1.07, and xrays kick up, then runaways after turnoff are near 3e14 on neuts/hards. Only small injections this time. No obvious bounce in startup, but current rise is fast, and CIII is down <.0025. Next: increase pg4 |
| Apr 2 2008 03:03:32:450PM | 1080402024 | Steve Wolfe | Shot#24: PG4 from 20 to 22msec. ICRF back on this shot, LH backing off one klystron. M49 down to 5e-9 in INIT. plasma full length. Not so many hards, down to 1.5e13. Clean looking startup, CIII<.0025. ICRF clean at 1.2MW LH clean at 750kW. Mass 49 peaks at ~1e-8. |
| Apr 2 2008 03:14:41:653PM | 1080402025 | Steve Wolfe | Shot#25: No pcs changes, LH will change phase to 75degrees Plasma full length but with early runaways, up to 1e14. Bad bounce in startup, around 15msec Looks like ICRF and LH were ok. HXR goes down during LH, then down again after turnoff. Next: back up on pg4, rcur offset. |
| Apr 2 2008 03:30:22:200PM | 1080402026 | Steve Wolfe | Shot#26: pg4 from 22 to 25msec, rcur offset from 1000 to 1800. This shot will be LH without ICRF, still 75deg plasma full length, no early runaways but plenty during and after LH. Clean looking startup, maybe still a bit fast, but moves out slowly; that is probably the rcur offset doing its thing. Small second bump on CIII around 20msec, still < .003. Next: Drop nl04 program to 3.5e19 |
| Apr 2 2008 03:42:43:933PM | 1080402027 | Steve Wolfe | Shot#27: Drop nl04 program to 3.5e19, remove pg3 puff in seg2 Load at 2-Apr-2008 15:32:05.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done This one will be with ICRF at 60degrees plasma full length. No early runaways, Hards go up to 2e13 during LH, then drop. Complicated by an injection at 1.16sec, which coincides with LH trip out. ICRF is clean at 1.2MW, Unfortunately, nl04 still goes to 5e19 during ICRF+LH. Gas is off after .55sec, so the increase is all coming from the walls/antennas. Next: try dropping early density some more. |
| Apr 2 2008 04:11:16:310PM | 1080402028 | Steve Wolfe | Shot#28: drop nl04 target to 3e19, slower rise. Pg4 from 25 to 26msec Load at 2-Apr-2008 15:45:33.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Delay for Josh to clear a data system hang. Early disruption at .25sec. Looks like an injection, not so different from #6. I don't think it was due to the density change, but it's possible it's a locked mode. ECE responds right after acoil comes on. M49 to 3.5e-8 after this one. Next: raise early nl04 just a tad. |
| Apr 2 2008 04:14:35:217PM | 1080402029 | Steve Wolfe | Shot#29: raise early nl04 just a tad, first point at 3e19 from .3 to .2sec No seg 1 changes. Load at 2-Apr-2008 16:07:32.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done M49=1e-8 in INIT. Delay in INIT for Data system. NO power shot, daq problem |
| Apr 2 2008 04:28:28:170PM | 1080402029 | Steve Wolfe | Shot#29 (2nd try): raised early nl04 just a tad, first point at 3e19 from .3 to .2sec Since I've had some time to think, drop pg4 from 26 to 24msec Load at 2-Apr-2008 16:18:09.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done fizzle. Maybe needed to drop it futher. CIII at .006, not so bad, but essentially no current. M49 was at 7e-9 in INIT. Next: pg4 back to 22, rcur offset back to 1000 |
| Apr 2 2008 04:41:46:890PM | 1080402030 | Steve Wolfe | Shot#30: pg4 back to 22, rcur offset back to 1000 still trying for the lower density point. M49 is 6e-9 at INIT plasma full length, No early runaways, density during LH+ICRF 4.2e19 Looks good. Next: repeat with no ICRF, raise nl05 program to 3.7e19 |
| Apr 2 2008 04:53:15:480PM | 1080402031 | Steve Wolfe | Shot#31: repeat with no ICRF, raise nl05 program to 3.7e19 I probably should increase pg4 again, but instead split the difference and raise rcur offset from 1000 to 1400. Load at 2-Apr-2008 16:44:29.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done A few early runaways, but ran full length. They are probably satisfied, so on to upper null |
| Apr 2 2008 05:11:29:170PM | 1080402032 | Steve Wolfe | Shot#32: Import seg3 from seg3 of 1080115026 (Upper null). nl04 to 4e19 flat. Argon puff still at 100msec pg4 from 22 to 24msec Load at 2-Apr-2008 17:00:48.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Disrupted at 0.65sec, had some small early runaways.RF is on at 0.5sec. possible locked mode? M49 went to 1.5e-7 again. It is coming down faster than the last time, but it looks grim for more shots. |
| Apr 2 2008 05:22:11:617PM | 1080402033 | Steve Wolfe | Shot#33: pg4 form 24 to 20msec, rcur offset from 1400 to 1000 Raise nl04 from 4 to 5e19 This one is bound to be a fizzle anyway, but give it a try. M49 is at 3e-8 going to INIT. Fizzle, fairly strong, next one might make it. CIII is under .002, Ip gets to 44kA. Next: repeat, except fix slightly negative request on pg4 |
| Apr 2 2008 05:36:09:360PM | 1080402034 | Steve Wolfe | Shot#34: pg4 at 20msec, rcur offset at 1400 to 100 nl04 at 5e19, tweak pg3 puff in seg3 up around 0.4sec Load at 2-Apr-2008 17:24:57.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done M49 at 1.6e-8 in INIT, still pretty high; cross fingers. plasma disrupts at 1.27sec, LH tripped a couple times, ICRF flat at 2MW until the disruption. Big injection at 1.09sec M49 again at 1.5e-7, here we go again. Next: have a fizzle or two, then proceed. |
| Apr 2 2008 05:46:21:340PM | 1080402035 | Steve Wolfe | Shot#35: have a fizzle or two, then proceed. No pcs changes. M49 at 2.6e-8 at INIT fizzle. Got a little current. Maybe the next one will go. Next shot will be the last shot of the day. Brock will fire pellets in rampdown, in the unlikely event we get that far. |
| Apr 2 2008 06:06:46:530PM | 1080402036 | Steve Wolfe | Shot#36: pg4 from 20 to 19msec Brock will fire pellets in rampdown, in the unlikely event we get that far. This will be last shot today. Wait a little while, to give best chance for junk to pump away. I'll push the button at 15min into recool. M49 at 1.6e-8, about where it was on shot 34. got a fizzle. Pretty bad, hardly any current, less than on #35. Not clear why. Mass 28 went up to 3.5e-8, which it hadn't been doing. END OF RUN. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:56:48:700AM | Plasma | Ok | |
| 2 | 09:14:36:857AM | Plasma | Ok | |
| 3 | 09:27:32:357AM | Plasma | Ok | |
| 4 | 09:40:01:670AM | Plasma | Ok | |
| 5 | 10:03:05:573AM | Plasma | Ok | |
| 6 | 10:16:30:857AM | Plasma | Ok | |
| 7 | 10:28:56:247AM | Plasma | Ok | |
| 8 | 10:45:35:123AM | Plasma | Ok | |
| 9 | 10:58:06:060AM | Plasma | Ok | |
| 10 | 11:26:21:357AM | Plasma | Ok | |
| 11 | 11:39:18:137AM | Plasma | Ok | |
| 12 | 11:52:04:607AM | Plasma | Ok | |
| 13 | 12:30:51:013PM | Plasma | Ok | |
| 14 | 12:43:30:073PM | Plasma | Ok | |
| 15 | 12:56:14:607PM | Plasma | Ok | |
| 16 | 01:14:10:450PM | Plasma | Ok | |
| 17 | 01:29:17:467PM | Plasma | Ok | |
| 18 | 01:42:14:653PM | Plasma | Ok | |
| 19 | 01:54:57:090PM | Plasma | Bad | State Pulse entered early |
| 20 | 02:07:31:590PM | Plasma | Ok | |
| 21 | 02:19:56:140PM | Plasma | Ok | |
| 22 | 02:32:31:497PM | Plasma | Ok | |
| 23 | 02:45:21:230PM | Plasma | Ok | |
| 24 | 02:57:49:140PM | Plasma | Ok | |
| 25 | 03:10:11:073PM | Plasma | Ok | |
| 26 | 03:22:38:060PM | Plasma | Ok | |
| 27 | 03:35:15:513PM | Plasma | Ok | |
| 28 | 03:57:03:480PM | Plasma | Ok | |
| 29 | 04:09:37:810PM | Plasma | Ok | |
| 30 | 04:36:53:983PM | Plasma | Ok | |
| 31 | 04:49:38:980PM | Plasma | Ok | |
| 32 | 05:02:48:810PM | Plasma | Ok | |
| 33 | 05:15:23:763PM | Plasma | Ok | |
| 34 | 05:27:57:113PM | Plasma | Ok | |
| 35 | 05:41:35:213PM | Plasma | Ok | |
| 36 | 05:59:02:060PM | Plasma | Ok | |
| System Availability | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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