| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Vincent Tang,Alex Ince-Cushman |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Andy Pfeiffer,Gary Dekow,Bill Parkin |
| Engineering Operator Run Comment |
| MP#389 CNPA testing. SL: V. Tang MP#437 Edge poloidal rotation. SL: A. I |
| Session Leader Plans |
| Entered: Dec 5 2005 04:26:21:820PM |
| Author: Alex Ince-Cushman |
| Session Leader Plan - 1051206
Field Reversal and Edge Poloidal Rotation - MP 437 Session Leader: A Ince-Cushman Physics Operator: S Wolfe This half run day will be used to finish up the run on 1051202. 1 â?? Get a few repeatable USN shots with EDA-H modes (if there is enough RF power) 2 â?? A series of inner wall limited plasma with an elongation scan SETUP: Key diagnostics: Hirex, NeSoXs, Thomson, Edge Thomson, GPC, Bolometer arrays, McPherson, Chromex, CXRS, scanning probe Gas puffs: Argon/Neon puff: 40ms at 0.3s (Neon at 2psi, Argon at 1psi) Part 1) USN EDA H-modes ----------------------------- Load shot 1051202022, or possibly a similar shot from the first half of the run day. Key parameters are Bt=5.6 T Ip=0.8 MA NL_04 (target)=1.0e20 m-2 RF waveform: Flat top ON at 0.7 OFF at 1.3 at 3 MW Part2) Inner wall limited ------------------------------- The following shots will be loaded for the kappa scan 1.6 -> 1051109017 1.4 ->1050819002 1.2 -> 1050615025 |
| Entered: Dec 6 2005 07:33:10:383AM |
| Author: Vincent Tang |
| 1st half of day, MP#389:
Primary objective: determine if He and Boron/Mo impurities are affecting CNPA spectra. To do this, I plan to run 3-4 shots per bulk plasma condition and try to vary the different impurities in the plasma. We can than compare both the passive and beam induced spectra(shot-to-shot) and see if there's any effect. The fast ion CXRS experiment will also piggyback. We will need the McPherson to measure Boron and Mo lines together, chromex to measure He and Boron together, and the CXRS diagnostic to try to get Boron density as a function of radius. In addition we will have the HeII diode. Hopefully we can get a good relative measurements of the different impurities. DNB setup: Fire DNB at 1.0s, max pulse length and power allowed. RF setup: E-port only, on at t=0.5 to 1.5 flatop at specified powers of 0.5-1MW. Plan: 1. Establish target shot, LSN but like 1050818005, as discussed in Wolfe's PO Plan. Get good passive and active CNPA data. (1-2 shots?). Start at 0.5MW and go up to get optimum signal. 2. Repeat first shot, but with He puff at t=.3; try to get He conc. to be in the 1-5% range. See if CNPA spectra are affected. Repeated with bigger puff if required (1-2 shots). 3. Repeat first shot, but now inner wall limited. The Boron and MO should increased significantly. Note effect on CNPA signal. (1-2 shots). 4. Repeat inner wall limited shot with He puff at t=.3. (1-2 shots). Time permitting, move to higher power and repeat. |
| Physics Operators Plans |
| Entered: Dec 5 2005 02:43:03:723PM |
| Author: Steve Wolfe |
Engineering setup and physop plan for Tuesday, 1051206
MP#389 CNPA testing. SL: V. Tang
and
MP#437 Edge poloidal rotation. SL: A. Ince-Cushman
and maybe
MP#441 ICRF Coupling studies SL: A. Parisot
Run starts at 09:00 (lockup at 08:30) and ends at 17:00
Overnight ECDC in HELIUM, pressure=5e-5. Stop two hours before run
Bake at 60C
All transmitters in RUN-ON by 08:30AM
Power systems as on 1051122030
A-coil in standard configuration {+Dtop -Dbot -Jtop +Jbot},
enabled, start-time=0.3sec
Gas setup:
----------
fill B-top with 6psi D2 Hybrid ENABLED (PG4)
fill B-side lower with 1psi Ar+2psi Neon Hybrid DISABLED (PG1)
fill B-side upper with 15psi He4 Hybrid DISABLED
fill B-Main with 30 psi D2 Hybrid ENABLED
fill NINJA with 10psi D2 leave DISABLED
** Note changes on B-side Upper fill and B-main pressure **
Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo shutters
Enable DNB gate valve
Torvac setup: Gate valves open
Run Plan for MP#389 (1st half of run)
--------------------------------------
This may change, see SL_PLAN
Start with 5.4T, 600kA LSN discharge,
like 1051122030 but reduced elongation, nl04~5e19.
Presently loaded as seg2 in /home/wolfe/pcs_trees/pcs_1051206000
Want RF from E-port only from 0.5sec - 1.5sec, .5-1.0MW
DNB on (timing?) at max available current, pulse length
NO B-side lower puff for this part of the run.
Establish discharge to SL's taste, then begin puffing helium (PG2)
Start with 100msec puff at 201msec, believed to give ~5%. Adjust
based on spectroscopic data, CNPA signal.
Change to inner wall limited discharge (in seg3) and repeat.
Not sure if SL wants helium puffing into limiter shots as well.
Run Plan for MP#437 (2nd half of Run)
--------------------------------------
Pick up where they left off on Friday, 1051202022.
Use segment 4 presently loaded in 1051206000, which is
based on the USN shot with some adjustments. If that proves
problematic, maybe go to 1051123009 with suitable parameter
changes. Turn Argon/Neon puff on (PG1), helium puff off (PG2).
When done with the upper null, go to inner wall limited discharges.
Probably base this on the limiter case from the morning, with
increased current and density.
Change elongation in limiter discharge as requested by SL. This will
be done primarily with CLEARIN.
Run Plan for MP#441 (3rd half of run)
---------------------------------------
If there is time, A. Parisot wants to re-run some cases from
Monday's run with Helium 4 majority. Purge B-main and fill
with 40psi Helium 4; leave B-top with 6psi D2. Run as many
cases as will fit in the rest of the day.
Post Run: Begin warming up the machine in preparation for
an argon vent next week.
|
| Session Leader Summaries |
| Entered: Dec 6 2005 06:28:40:707PM |
| Author: Alex Ince-Cushman |
| Session Leader Summary
MP 437 - Field Reversal and Edge Poloidal Rotation Session Leader: A Ince-Cushman Physics Operator: S Wolfe This was a continuation of the run from 1051202. The run switched over to MP 437 after shot 17. We began by trying to reproduce one of our best shots from that day, 1051202015 (LSN EDA H-mode plasma). We were not able to reproduce steady h-modes in LSN so we didnâ??t even try going to USN. After that we started running inner wall limited plasmas (shot 23) in an attempt to do a scan in elongation. Of the 19 attempted shots we had 7 fizzles, 5 disruptions, and one no power shot which left us with 3 LSN and 3 inner wall limited plasmas (two at kappa = 1.6 and one at 1.35). All shots had the puff starting at 0.3s with 2psi Neon and 1psi Argon 18 LSN 3 H-modes 60ms - H-modes mostly ELM free 19 LSN - 60ms - Only 0.8 MW of RF so no H-modes 20 Fizzle - 21 Fizzle - 22 LSN 5 H-modes 60ms - 2MW of RF but several trips 23 Fizzle 24 In-Lim - 60ms - 2MW of RF no trips, kappa = 1.6 25 In-Lim - 80ms - Disrupted at ~0.5 26 Fizzle 27 Fizzle 28 In-Lim - 60ms - kappa = 1.6 29 In-Lim - 60ms - Disrupted at 0.65s 30 Fizzle 31 No power shot 32 In-Lim - 60ms - kappa = 1.35 33 Fizzle 34 In-Lim - 60ms - Disruption at 0.59s 35 In-Lim - 60ms - kappa = 1.35, disrupted at 1.15s 36 In-Lim - 60ms - Disrupted at 0.37s |
| Entered: Dec 9 2005 01:42:30:947PM |
| Author: Vincent Tang |
| ---12/06/05---
MP: CNPA testing and calibration The CNPA impurity run went well today. We were able to investigate passive CNPA spectra from plasmas with He, Boron, and Mo impurities. Most significantly, the DNB performance was excellent at 7A and 150ms pulse length. This resulted in an active CNPA signal about 6-7X greater than the passive signal, which will allow us to isolate the impurity issues from the passive spectra. In addition, the good beam performance allowed us to track boron densities into the plasma core through the CXRS diagnostic. At the least, the great beam signal on all 3 F-top channels will allow us to secure fast ion temperatures in the core for these shots. We had 15 shots out of 17 attempts. The first few shots were LSN low density(~nel~4e19), low RF (.5MW) shots. They established a clean base from which we could use for comparison to later impurities laden shots. The discharges with He puff after these base shots had ~2-4x higher CNPA count rate but semingly similar passive spectra shape. The inner wall shots had a lot of impurities, especially Boron and Mo, but their effect on the CNPA spectra was not as obvious as the He puff-shots. Further detailed analysis is required. An issue we had was that after a shot with He puff, it took several shots before the He content in the plasma returned to normal. The 4 scenarios outlined in the plan was completed. We hence took some shots with D antenna instead of E in order to increase the relative Mo concentration for the LSN shots. (A suggestion from Matt based on D and E data from previous runs). We also took some data at 1/4MW; even at 1/4MW, the CNPA signal was still strong because of the low density. We had decent measurements of all the relevant impurities, along with their relative ratios-- McPherson: Boron (edge) vs. Mo (core) Chromex: Boron (edge) vs. He (edge) Hirex: Mo (core) CXRS: Boron vs. radius into R~75cm. Lastly, we had a couple of lock-mode shots without sawteeth that are interesting as a test for fast ion diffusion. Thanks to everyone for their good work; especially the beam and spectroscopy guys for all of their help, and the PO for getting good low density plasmas. |
| Physics Operator Summaries |
| Entered: Dec 6 2005 06:14:57:800PM |
| Author: Steve Wolfe |
This run day was definitely a mixed bag.
The first half-day went pretty well. Vincent got
through all of his planned program and actually
got some additional points, with some lower power shots,
and a comparison of D- and E-port, which apparently
still has the feature that D is more of a Mo source
than E.
Running the low density divertor discharges was no problem,
as we were actually puffing gas at 0.4 and 0.5e20 nl4.
The limiter shots were done with higher elongation than
originally specified, since the CNPA signals were plenty
high enough. The limiter shots were programmed just by
changing CLEARIN from the initial LSN cases.
We had problems with locked modes on the limiter cases,
even though the B21_PROJ feedback was on, and the
computed 21 amplitude was under a gauss. The locked modes
showed up on shots 10 and 12, after tweaking the outer gap.
Raising the density from .5 to .6 early in the shot got rid of them.
Also, running with a large outer gap as on #9 and 13 also got
rid of it, although 13 actually had somewhat higher density
due to the helium puff. These shots are probably worth some
further study, and provided a good non-sawtoothing comparison
for the CNPA dataset.
Through the first half of the run I had to continually increase
the pre-puff to try to reduce runaways and avoid duds. PG4 program
eventually got up to 55msec, with ratiomatic pressure above .08mTorr.
Raising the RCUR offset from 1600 to 2000 actually seemed to get
rid of the bounces and runaways in these low density shots, although
the breakdown came a little later on the shots with the higher
RCUR offset.
The second half of the run, MP#437, was much more problematic.
Running more normal densities changed the wall conditions, and
the very high pre-puffs and RCUR offset had to be undone; this
wasn't unexpected, but nevertheless we ended up with a very high
proportion of fizzles that never completely stabilized.
We ended the day with pg4 at 37 to 38msec, close to where we
started. The shots that went had good looking startups, but
these were not really robust against disruptions.
Furthermore, a lot of the shots that ran did not run well. We started off by
trying to repeat a Lower null shot from Friday, and took six
tries to decide that the boronization was too far gone to attempt
steady h-modes in upper null. We therefore never actually attempted
upper null, but instead went straight (?) to the limiter cases.
The base limiter condtion was loaded from 1051109017, with elongation
~1.6, 800kA, 5.4T; the argon/neon puff was increased to 60msec.
These cases were plagued by more fizzles and also
early disruptions, associated with quite cold (possibly hollow)
temperatures during current rise. The idea was to do an elongation scan,
but we only got one lower kappa=1.35 case, and the best shot of
that #32 had no TS data. Attempted repeats had disruptions and
fizzles; shot#35 made it to 1.13sec before getting killed by an
injection, but it also had early problems. The last shot #36 was an
attempt at a kappa=1.2 case, but it disrupted before .4 sec, again
with current-rise internal disruptions preceeding the final crash.
I'm not sure how to get these lower elongation limiter cases to run
reliably. The problem seems to be in the current rise, and may be
due to accumulating neon or argon from previous attempts. None of these
last shots had any runaways or bouncy startups, but there were
already incipient problems at the start of segment 2. If the
neon puffing hadn't been essential to the experiment I would have
tried turning it off, but that wasn't really an option since
a good shot with no neon wouldn't have been useful anyway.
To add to the difficulties, we had two spurious IOC faults on oh2l,
one during CHECK on shot#31 which resulted in a no-power shot, and one
at or before 80msec on #33, which had already fizzled by the time
of the fault. The voltage and current traces from the supply showed
big negative spikes around 30ms which do not appear on the bus diagnostics.
This looks like an instrumentation problem about to get worse,
and should probably be checked out during the shutdown.
The multiple fizzles and duds, and the low current normal shots in the
morning, were hard on the coax resistance. We got a lot of warnings,
all below 2.9uOhm. There were no new records, and no obvious trends
except that consecutive fizzles gave slightly higher resistances than
singles.
Scorecard:
Test/NoPower 1
Duds 2
Fizzles 6
Plasmas 27 (including 5 early disruptions)
-------- --
Shots 36
|
| Session Leader Comments | |||
| Dec 6 2005 08:16:20:790AM | Vincent Tang | All four CNPA channels operational and within normal parameters. Ap set at notch 20.
Fast ion CXRS channel set to vertical channel, 2051 Spec at 4833 setting, ap opened to 10 microns. Toroidal CXRS shutter opened. | |
| Dec 6 2005 09:10:08:710AM | 1051206001 | Vincent Tang | very low density shot (nel 3e-19), excellent beam and passive signal. Up the density a bit, and I think we have a good basis shot. |
| Dec 6 2005 09:22:52:087AM | 1051206002 | Vincent Tang | Excellent data and shot, but no McPherson data. Repeat.
|
| Dec 6 2005 09:56:15:117AM | 1051206003 | Vincent Tang | Good shot, good data; went into h-mode at the end. No McPherson data again; switching to hirex for Mo measurements
Beam signal is ~5 times higher than base. Puff on next shot. |
| Dec 6 2005 09:51:27:447AM | 1051206004 | Vincent Tang | Dud, Repeat
|
| Dec 6 2005 10:05:10:007AM | 1051206005 | Vincent Tang | He Puff at .3. Higher count rate, possible spetra change. Double puff to check.
Excellent data. |
| Dec 6 2005 10:10:03:773AM | 1051206006 | Vincent Tang | Disrupted early. Repeat.
|
| Dec 6 2005 10:33:37:133AM | 1051206007 | Vincent Tang | Good shot, doubled He puff has slightly softer spectra. Repeat shot 3 to make sure things are really different(no puff next shot). |
| Dec 9 2005 11:48:33:220AM | 1051206008 | Vincent Tang | No He puff..definitly seeing lower count rate on Ch2(7x less roughly).
Next shot: Inner wall limited, no puff. boron and Mo should go up. -12-09-05 Hmm...7x might be over-estimating it...most of the shot is roughly twice less. |
| Dec 6 2005 10:59:43:867AM | 1051206009 | Vincent Tang | Much more MO/B, but no Mcpherson and HIREX data. More counts on CNPA, softer spectra compared wtih shot 3 (t=1.2 to 1.3)
repeat to get McPherson and HIREX data. |
| Dec 6 2005 12:03:21:627PM | 1051206010 | Vincent Tang | Lock mode, no sawteeth. Spectra at 1.2 to 1.3 is softer (and lower counts) compared with shot 3 and 9. Could be good shot to see effects of sawteeth.
Next: repeat to get rid of lock mode. I think on this shot I double-checked that the Bill's Mcpherson was opened. Also opened aperture to 100 microns. |
| Dec 6 2005 11:33:42:023AM | 1051206011 | Vincent Tang | Lock mode gone, but density is sloping; CNPA passive data shows rise in higher energy, but impurities supposily didn't change.
Repeat and try to get flat nel4. |
| Dec 6 2005 11:58:33:877AM | 1051206012 | Vincent Tang | Lock mode again....No beam on last shot. Lock mode signal weaker except for large spike at ~275keV.
next: inner wall limited with large puff. |
| Dec 6 2005 12:07:23:050PM | 1051206013 | Vincent Tang | Softer spectra, but could be because of density rise. No huge jump in signal as seen in LSN He puff case.
Next: LSN with D this time, to try to increase relative Mo concentration. |
| Dec 6 2005 12:24:18:800PM | 1051206014 | Vincent Tang | Definite spectra changes between this shot and shot 3; zeff is higher for shot 14.
Next: go to .25MW. |
| Dec 6 2005 12:42:36:767PM | 1051206015 | Vincent Tang | got .3MW LSN. Good signal, weaker as expected.
next: go back to .5MW to try to see data with lower He/B conc. |
| Dec 6 2005 12:54:38:173PM | 1051206016 | Vincent Tang | He is still sticking around.
Next: final shot--one more .25 MW D, hopefully with less He. Change 2051 back to 4880, with 30 micron opening. |
| Dec 6 2005 12:57:21:533PM | 1051206017 | Vincent Tang | Good data, last shot.
Thanks everyone, espeically Matt and Ken. |
| Dec 6 2005 01:20:17:970PM | 1051206018 | Alex Ince-Cushman | LSN based on 1051202015
2MW RF, from 0.7 - 1.3 Neon/Argon puff at 0.3s for 60ms with Neon at 2psi and Argon at 1psi RF tripped, no EDA H-mode For next shot increase nl04 to 1.0 |
| Dec 6 2005 01:29:38:457PM | 1051206019 | Alex Ince-Cushman | LSN - same as previous shot but with nl04 increased to 1.0
Neon/Argon puff same as last shot (0.3s for 60ms with Neon at 2psi and Argon at 1psi) Only 0.8MW of RF so no H-modes |
| Dec 6 2005 02:09:17:360PM | 1051206022 | Alex Ince-Cushman | LSN - 2MW of RF but there were a few trips. It looks unlikely that we will get steady EDA like H-modes so we are going to move to inner wall limited discharges for the next shot.
Neon/Argon puff same as last shot (0.3s for 60ms with Neon at 2psi and Argon at 1psi) |
| Dec 6 2005 02:44:49:690PM | 1051206024 | Alex Ince-Cushman | Inner wall limited discharge, ~ 2MW of RF (no trips), I = 0.8MA
good shot Neon/Argon puff same as last shot (0.3s for 60ms with Neon at 2psi and Argon at 1psi) |
| Dec 6 2005 02:47:22:500PM | 1051206025 | Alex Ince-Cushman | Inner wall limited discharge
Disrupted at about 0.5s. Then neon/argon puff was increased from 60ms to 80ms but neon and argon radiation was similar to the previous shot. McPherson data suggests a Moly injection may have been the culprit. |
| Dec 6 2005 03:25:10:453PM | 1051206028 | Alex Ince-Cushman | Inner wall limited discharge
kappa at 1.6. Good shot. For the next shot will try moving down to kappa = 1.4 Neon/Argon puff same as last shot (0.3s for 60ms with Neon at 2psi and Argon at 1psi) |
| Dec 6 2005 03:37:25:220PM | 1051206029 | Alex Ince-Cushman | Inner wall limited discharge
Aimed for kappa of 1.4, but discharged disrupted early. Try for kappa = 1.4 again. |
| Dec 6 2005 04:44:40:953PM | 1051206032 | Alex Ince-Cushman | Inner wall limited
Kappa at 1.35. Pretty good NeSoXs signal levels. Neon/Argon Puff: 0.3s for 60ms |
| Dec 6 2005 05:02:55:563PM | 1051206035 | Alex Ince-Cushman | Inner wall limited
Kappa at 1.35, disrupted at 1.155. Neon/Argon Puff: 0.3s for 60ms |
| Physics Operator Comments | |||
| Dec 5 2005 01:39:29:053PM | Steve Wolfe |
Getting set up for the 1051206 run.
There will be two experiments: Vincent's CNPA run in the
morning, and Alex Ince-Cushman MP#437 in the afternoon.
Vincent wants a limiter discharge like 1050818005 and a "similar"
lower null. I have imported 1050818005 into seg3, updated
all the magnetics and Ip predictors, setup B21_PROJ feedback and
saved as 1051206000 in ~/pcs_trees.
This was a low elongation shot, and rather than trying to make
it into a LSN I am going to start from a 600kA LSN from
November and try to reduce the elongation, etc. to suit.
Import Seg 2 from 1051122030 into Seg2.
TF current to -150000, PG3 to zero.
NL04 from 0.6 to 0.4e20 (Vincent says he wants 5, but 4 is what
was in the limiter shot.
ZXU from .05 to .07 to try to reduce elongation
Copy PG2 puff from seg3 (100msec starting at .201sec)
I think that for aic's run we can start from the limiter case,
with current increased to 800kA. For his upper null case, Bob
recommended starting from 1051202022, which ran but has several
unpleasant features, not least that shots 23 and 24 disrupted.
Alex says that he does not need the small inner and outer gaps
on this one. Also, I notice that the ZCUR program is inconsistent
with the startup, since it starts at zero and goes to -.005,
while the startup ends at -.009, so we are jerking the plasma
up and then back down early. I'll work with this as a starting
place, but if I get into trouble, a replacement could be 1051123009.
Load 1051202022 Seg 3 into Seg4.
Increase CLEARIN by .005 (to -.01, -.005)
Copy ZCUR from seg2, then change points at .381 and after to -.005
(I'm not sure he needs this either, we normally run upper nulls
LOad wire 9 from seg2 B21_PROJ, set integrator C to start at 0.3,
zero A-coil current and move last point from 10.0 to 3.5sec
Build all segments and save as /home/wolfe/pcs_trees/pcs_1051206000
at ZCUR=0).
| |
| Dec 5 2005 03:38:55:427PM | Steve Wolfe | Still hacking at the pcs setup. Note that the chopper voltage in seg2 is at 100V instead of zero. Change it and resave 1051206000 | |
| Dec 6 2005 08:02:28:553AM | Steve Wolfe | Continuing to set up PCS for today's run. Load from /home/wolfe/pcs_trees/pcs_1051206000 Joe had all kinds of startup problems yesterday, but I'll start with seg1 from 1051205003 anyway; increase pg4 to 35msec I may want to play with Bz control in seg1. Try putting an offset of -.007 into the bz_0 on wire 7, and monitor the aout; I may also try copying in a waveform. Note ic_ef4u=-1330 br_0 = 0 Per SL plan for first part of run, change He4 puff from 0.2 to 0.3sec in seg2, copy to seg3. Note that this will be off for the first several shots. We'll probably want to tweak at the equilibrium for a few shots. SL wants minimum elongation to reduce opacity to his fast neutrals. Note: Second half SL's plan calls for three different source shots for his limiter elongation scan, including two from last summer. The low kappa case is practically touching on the outside, and disrupts in flattop. I'm probably going to ignore these and either use a modified seg3 (low kappa) or start from his suggested 1051109017 (kappa=1.6). Note that for USN he asks for 5.6T, so I need to check if he wants that for the limiter cases as well. Do a load, get one factor warning, two wirename warnings in seg1. touch the wires, reload. It loaded ok, despite the fact that I accidentally moved points on wires 6 and 10 instead of 7 and 9. Put the values back, just so PCS_compare doesn't flag diff's. And it complains again? Change them again, this time on the correct wires; no complaints. Put it back and reload; ok. Do a PCS_compare. Diff's on oh1 and oh2. modify and reload. OK, now PCS_compare only flags diffs on BZ_0, IC_EF4U, PG4. Load at 6-Dec-2005 07:58:26.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| Dec 6 2005 09:05:23:883AM | 1051206001 | Steve Wolfe | Shot#1: base pressure at INIT=1.3e-7;in PULSE=1.1e-7 plasma, lots of runaways. nl04=3e19, kappa=1.6. It's actually puffing gas through this shot. Next: raise nl04 demand, increase pg4 |
| Dec 6 2005 09:18:30:600AM | 1051206002 | Steve Wolfe | Shot#2: raise nl04 demand to 5.0e19 pg4 from 35ms to 37ms plasma, still have runaways, but fewer. NL04=4.9e19 Br0 looks a little negative. Looks like the startup could still use a little more gas. next shot: add 2ms to pg4 (pushing my luck?) |
| Dec 6 2005 09:29:41:930AM | 1051206003 | Steve Wolfe | Shot#3: pg4 from 37 to 39msec plasma, still have some runaways. late breakdown, around 8msec Got an H-mode at the end of the flattop. next shot: back off pg4 a little |
| Dec 6 2005 09:50:28:477AM | 1051206004 | Steve Wolfe | Shot#4: pg4 from 39 to 38msec Enable B-side upper puff for this shot (He4 100ms puff) p0=9.5e-7 in pulse dud. OH currents look a little funny (too close together), but the fields don't look bad. Br0 still a little negative next: raise pg4 to 40msec |
| Dec 6 2005 09:59:08:867AM | 1051206005 | Steve Wolfe | Shot#5: pg4 38msec to 40ms Enable B-side upper puff for this shot (He4 100ms puff) plasma, looked like more runaways bouncy on startup, almost lost it. next: raise pg4 some more! |
| Dec 6 2005 10:16:59:633AM | 1051206006 | Steve Wolfe | Shot#6: pg4 40ms to 42msec Increase helium puff from 100ms to 200ms early disruption, .316sec. lots of runaways. Still bouncing in startup. Got another oh coax warning, and we'll probably get another next time. next: add a pg3 puff in seg2 at 50V from 100 to 200msec increase pg4 another 2ms |
| Dec 6 2005 10:29:22:617AM | 1051206007 | Steve Wolfe | Shot#7: pg4 42ms to 44msec add a pg3 puff in seg2 at 50V from 100 to 200msec plasma, no runaways breakdown a little late, 7msec. No bounce. Br0 is more normal looking, Bz getting a little more positive. oh2u is barely double swinging on these, so we may keep getting coax issues. Just squeeked by on this one, 2.37uOhm. It did go down at the end of the shot though. next shot: ic_ef4 down by 5A |
| Dec 6 2005 10:40:32:053AM | 1051206008 | Steve Wolfe | Shot#8: ic_ef4 from -1330 to -1335 Disable Helium puff. plasma, runaways came back some. Bounce on startup again; either should have raised pg4 or not dropped ef4 next shot: raise pg4 2msec Go to limiter discharge |
| Dec 6 2005 10:56:14:977AM | 1051206009 | Steve Wolfe | Shot#9: pg4 from 44 to 46 msec Go to limiter discharge, just use seg2: CLEARIN from .001 (about) to -.02 RCUR from .662 to .652 Helium puff still disabled plasma, some runaways, still bouncing in startup elongation is 1.5, limited, outer gap is a little bigger at 1.5 to 1.7cm, but RF doesn't seem to mind. next shot: leave pg4 alone, raise RCUR a smidge |
| Dec 6 2005 11:13:02:163AM | 1051206010 | Steve Wolfe | Shot#10: RCUR from .652 to .656 early, .654 late leave zxl low in rampdown to prevent late diversion. No startup changes until I see how the gas evolves from the limiter case. plasma, still with runaways, stilll bouncing. Need to raise pg4 again. May have hit a locked mode at .74sec, despite B21 feedback. Still diverts in rampdown. Try raising early pg3 puff in seg2 some more |
| Dec 6 2005 11:22:43:867AM | 1051206011 | Steve Wolfe | Shot#11: pg4 to 48msec! Try raising early pg3 puff in seg2 some more plasma still with runaways, still bouncing. No locked mode this time, but early density is higher, around 6e19, then falling; looks the same as 9 at beam time next shot: up to 50 on pg4 |
| Dec 6 2005 11:40:17:087AM | 1051206012 | Steve Wolfe | Shot#12: pg4 to 50msec decrease pg3 puff between .2 and .5sec to try to flatten the density without getting a locked mode, I hope. plasma, smaller runaways, but got the locked mode back. Looks very similar to shot#10, onset a little later, around .87sec. No bounce, but a later breakdown, 7msec No beam on that shot. There will be a cell access for TCI. Others also. |
| Dec 6 2005 12:01:24:923PM | 1051206013 | Steve Wolfe | Shot#13: Reload seg2 from shot 9, but with helium puff This one had the larger gap, but no locked mode plasma no runaways (small burst early). No locked mode, I think the he4 puff substituted for the pg3. next shot: Back to LSN, puff off. |
| Dec 6 2005 12:13:20:000PM | 1051206014 | Steve Wolfe | Shot#14: Reload seg2 from shot 8, LSN again. helium puff off RF will pulse from D instead of E plasma, bounce in startup, some runaways RF looks ok, density nice and flat. next: More pg4 again |
| Dec 6 2005 12:26:33:563PM | 1051206015 | Steve Wolfe | Shot#15: pg4 from 50 to 52msec. I think this is the most I've ever used for pre-puff. Lower RF power for this one, still from D-port plasma, runaways again. Still bouncing with pressure close to 80uTorr! Density is a little lower this time. RF looks happy at 300kW. next: Kick pg4 up to 55 |
| Dec 6 2005 12:40:37:410PM | 1051206016 | Steve Wolfe | Shot#16:pg4 from 52 to 55msec Raise rf power back to 0.5MW again (repeat of 14) plasma again with runaways. Still bouncing. Try increasing RCUR offset in seg1. |
| Dec 6 2005 12:56:40:237PM | 1051206017 | Steve Wolfe | Shot#17: RCUR offset from 1600 to 2000 back to .25MW from D-port, repeating #15 plasma, no runaways, no bounce, later breakdown 7.7msec Next: on to Alex's half of the run |
| Dec 6 2005 01:11:30:737PM | 1051206018 | Steve Wolfe | Shot#18: on to Alex's half of the run Load seg3 from seg2 of 1051202015 (LSN repeat from last week) seg2 off, seg3 on. PG2 puff from 40 to 60msec. Enable b-side lower initial gap moved out, rcur from .663 to .655, getting rid of jog. This is 800kA, 5.6T, 8e19, LSN No startup changes this time. plasma full length, H-modes. Still a late breakdown, no runaways. Outer gap between 1.5 and 2cm. RF trips on D and J next raise nl04 to 1.0e20 |
| Dec 6 2005 01:24:32:377PM | 1051206019 | Steve Wolfe | Shot#19:raise nl04 to 1.0e20 I'm tempted to start reducing pg4, but leave it for this shot. plasma full length, no h-modes, no runaways, breakdown still late D and J both faulted out as soon as they came on, only got about 800kW from E-port. next shot: pg4 down to 50msec |
| Dec 6 2005 01:35:06:487PM | 1051206020 | Steve Wolfe | Shot#20: pg4 from 55 to 50msec fizzle. I guess I tweaked too soon. Or maybe not enough, looks like too much gas, or Bz next: ef4 down 5A, pg4 down 2 more msec |
| Dec 6 2005 01:48:28:767PM | 1051206021 | Steve Wolfe | Shot#21: pg4 from 50 to 48msec EF4 from -1335 to -1340 Maybe I should undo the RCUR change? Leave it for this one. Another fizzle. breakdown still late, Bz rising too fast Bz seemed to go the wrong way. next: RCUR back to 1600 |
| Dec 6 2005 02:02:18:220PM | 1051206022 | Steve Wolfe | Shot#22: RCUR back to 1600 pg4 at 48msec, ef4 at -1340A plasma, 5 hmodes, breakdown still late, RF with lots of faults, but mostly stays on. no runaways, no bounce Bz still too positive, barely made it. next: ef4 down 10A, pg4 down 3msec |
| Dec 6 2005 02:13:17:627PM | 1051206023 | Steve Wolfe | Shot 23: ef4 from -1340 to -1350, pg4 from 48ms to 45ms. Load seg2 from 1051109017 (Limiter case, eout=1.6 800kA 5.4T 1e20) Increase pg1 from 50 to 60msec Fizzle. Earlier breakdown, Bz is down, still choking. next: PG4 to 40msec |
| Dec 6 2005 02:28:32:673PM | 1051206024 | Steve Wolfe | Shot 24: PG4 from 45 to 40msec plasma, limited, disrupts in rampdown ~1.7sec Late breakdown again, 8.3msec No bounce no runaways. RF is happy, around 2.3MW next shot: repeat with no RF |
| Dec 6 2005 02:42:12:877PM | 1051206025 | Steve Wolfe | Shot#25: repeat with no RF Raise PG1 Argon/Neon puff from 60 to 80msec Decrease PG4 from 40 to 38msec plasma disrupts at 0.5sec. Too much neon? Bd at 7msec, no runaways, no bounce. Bz is more negative on this one. next shot: Argon/neon puff back down to 60msec |
| Dec 6 2005 02:50:10:813PM | 1051206026 | Steve Wolfe | Shot#26: repeat with no RF Argon/neon puff back down to 60msec fizzle. Should have dropped the pre-puff after the disruption next: pg4 down 2ms |
| Dec 6 2005 03:03:55:673PM | 1051206027 | Steve Wolfe | Shot#27:pg4 from 38 to 35msec, working our way back down. pg1 pulse at 60msec, still no RF dud? Dropped it too far. next: PG4 back up to 38ms |
| Dec 6 2005 03:16:15:550PM | 1051206028 | Steve Wolfe | Shot#28: PG4 back from 35 to 38ms If this doesn't go, ECDC for 15minutes in D2 plasma to 1.7sec, no bounce no runaways next shot: start elongation scan |
| Dec 6 2005 03:36:57:673PM | 1051206029 | Steve Wolfe | Shot#29:start elongation scan CLEARIN from -.02 to -.04 LPI gate valve enabled, Pellet will fire at 1.3sec No startup changes this time. plasma disrupted at .66sec, marfe starts at .4sec Looks colder right from the startup, current rise is a little slower. Never sawtooths. I've got the clearin ramp in starting at 0.3sec, could delay that, and delay the density ramp, but I think this one had problems before it got that far. |
| Dec 6 2005 03:43:26:627PM | 1051206030 | Steve Wolfe | Shot#30: Delay clearin point to 0.5sec, slow down density ramp to .65sec fizzle, not unexpected after the disruption. next: drop the target density, since we're going for a shorter plasma |
| Dec 6 2005 03:54:21:643PM | 1051206031 | Steve Wolfe | Shot#31: Decrease pg4 from 38 to 37msec; probably should have done that before, but last time I dropped it we got a dud. Decrease nl04 target from 1.0 to 0.8, since the path length is going to be shorter. PF breaker pulled out in CHECK, no power shot. |
| Dec 6 2005 04:12:59:080PM | 1051206032 | Steve Wolfe | Shot#32: pg4 from 38 to 37msec; probably should have done that before, but last time I dropped it we got a dud. Decrease nl04 target from 1.0 to 0.8, since the path length is going to be shorter. plasma to 1.7 sec, kappa=1.35, nebar = 1.9e20 No pellet. Thomson didn't get reset after the power room access, so no TS data next: repeat |
| Dec 6 2005 04:27:59:893PM | 1051206033 | Steve Wolfe | Shot#33: repeat fizzle, PF breaker pulled, crowbar late breakdown 12.7msec. The power system fault came later, oh2l at 80msec don't know why the breakdown is so late. next: pg4 back to 38msec |
| Dec 6 2005 04:45:02:767PM | 1051206034 | Steve Wolfe | Shot#34:pg4 from 37 to 38msec Still trying to repeat shot 32 with TS Another early disruption around 0.56sec There were a couple of internal disruptions between 0.2 and 0.4 sec. Current rise and startup look ok, te gets to 2keV but never sawtooths. Gas turns off hard at segment switch It did the same on 32, but that one was a lot happier. PG4 back to 37 and try again |
| Dec 6 2005 04:52:27:097PM | 1051206035 | Steve Wolfe | Shot#35:pg4 from 38 to 37msec Still trying to repeat shot 32 with TS plasma to 1.13sec, almost lost it early again very cold and possibly hollow before .2sec, but survived, barely. kappa=1.35 next (and last) shot: Try for lower elongation ~1.2 |
| Dec 6 2005 05:10:21:550PM | 1051206036 | Steve Wolfe | Shot#36:Try for lowest elongation ~1.2 CLEARin to -.06, speed up current rise increase pg3 between .1 and .2 Drop nl04 target from .8 to .7e20 Disrupts at .36 sec, lots of internal disruptions during current rise. Current never made it over 700kA. Never sawtoothed. Again, under 1keV at .1sec. Early current rise looks smooth, but it's cold. Not exactly a good one to leave on the drum, but that's the end of the run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:58:59:053AM | Plasma | Ok | |
| 2 | 09:11:50:850AM | Plasma | Ok | |
| 3 | 09:24:20:710AM | Plasma | Ok | |
| 4 | 09:41:18:227AM | Plasma | Ok | |
| 5 | 09:54:33:867AM | Plasma | Ok | |
| 6 | 10:07:15:307AM | Plasma | Ok | |
| 7 | 10:19:56:337AM | Plasma | Ok | |
| 8 | 10:33:23:227AM | Plasma | Ok | |
| 9 | 10:50:10:913AM | Plasma | Ok | |
| 10 | 11:04:13:510AM | Plasma | Ok | |
| 11 | 11:17:29:150AM | Plasma | Ok | |
| 12 | 11:34:01:430AM | Plasma | Ok | |
| 13 | 11:57:20:093AM | Plasma | Ok | |
| 14 | 12:09:39:207PM | Plasma | Ok | |
| 15 | 12:23:02:673PM | Plasma | Ok | |
| 16 | 12:36:38:330PM | Plasma | Ok | |
| 17 | 12:52:31:987PM | Plasma | Ok | |
| 18 | 01:05:24:987PM | Plasma | Ok | |
| 19 | 01:18:05:720PM | Plasma | Ok | |
| 20 | 01:31:22:127PM | Plasma | Ok | |
| 21 | 01:43:39:970PM | Plasma | Ok | |
| 22 | 01:56:27:737PM | Plasma | Ok | |
| 23 | 02:09:47:893PM | Plasma | Ok | |
| 24 | 02:22:11:813PM | Plasma | Ok | |
| 25 | 02:34:38:673PM | Plasma | Ok | |
| 26 | 02:47:22:127PM | Plasma | Ok | |
| 27 | 03:00:09:597PM | Plasma | Ok | |
| 28 | 03:12:37:347PM | Plasma | Ok | |
| 29 | 03:26:30:017PM | Plasma | Ok | |
| 30 | 03:40:02:627PM | Plasma | Ok | |
| 31 | 03:52:32:410PM | Plasma | Bad | IOC OH2L, no power shot |
| 32 | 04:06:08:783PM | Plasma | Ok | |
| 33 | 04:18:47:610PM | Plasma | Bad | IOC OH2L during pulse |
| 34 | 04:35:08:610PM | Plasma | Ok | |
| 35 | 04:47:50:660PM | Plasma | Ok | |
| 36 | 05:00:35:127PM | Plasma | Ok | |