| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Earl Marmar |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Bill Parkin |
| Engineering Operator Run Comment |
| MP 496 High Performance Opoeration at Ip>1.2 MA E/O Pierson P/O Wolfe S/ |
| Session Leader Plans |
| Entered: Aug 28 2007 05:34:19:097PM |
| Author: Earl Marmar |
| MP 496 High Performance Operation at Ip > 1.2 MA
SL: E. Marmar PO: S. Wolfe The purpose of these experiments is to explore the confinement, transport, pedestal scaling and divertor behavior as plasma current is scanned above 1.2 MA using hydrogen minority heating, with maximum power available. Ideally, these experiments will be carried out using the nominal ITER shape, with a target to reach 1.6 MA, which should yield the ITER q_95 at the ITER magnetic field. If we can access these parameters with 6 MW of input power (ICRF + Ohmic), and good H-Mode confinement (H89 ~ 1.8), the resulting plasma will have the same absolute pressure and β as the baseline ITER H-Mode discharge target. Exploration of this territory should significantly expand our parameter ranges for studies of confinement (particularly scaling with Ip), the H-mode pedestal, including ELM character, and spontaneous rotation. These experiments will directly contribute to one of the C-Mod plain English goals for FY2008, Confinement at High Plasma Current. Elucidation of these results for extrapolation to ITER will be a major goal of these studies. Run Plan Overnight boronization prior to the run. See the PO_Plan for other engineering setup information. IP = 1.2 MA, nl_04 target = 1.1 e20 m-2, establish EDA H-Mode at PRF = 3.5 MW. IP = 1.5 MA, nl_04 target = 1.4 e20, PRF = 3.5 MW. If promising, increase RF power to max available at 1.5 MA, in .75 MW steps IP = 1.6 MA, nl_04 target = 1.5 e20, PRF = 3.5 MW. If promising, increase RF power to max available at 1.6 MA, in 0.75 MW steps If time permits, go back to IP = 1.35 MA, nl_04 target = 1.3 e20, PRF = 3.5 MW, to help fill in the current scan data. If we have trouble getting EDA H-mode, increase target density and/or raise toroidal field to 5.7 tesla. We'll start the day with the cryopump on, to try to keep the edge pressure down for the ICRF. We'll use between-shot boronization during the day if we think the overnight boronization is starting to wear off. |
| Physics Operators Plans |
| Entered: Aug 28 2007 04:13:32:223PM |
| Author: Steve Wolfe |
Physop Plan for Wednesday, 29-Aug-2007
MP#496 High performance operation at Ip>2MA
SL: Marmar
PO: wolfe
Overnight boronization required before this run
-------------------------------------
Boronization Parameters
--------------------------------------
foreline(TC6) pressure request: 70 mTorr
sweep (rmin/rdwell/rmax): 60/75/80 cm
scan: 60/120 s ** NOTE - 50% dwell; this is unusual **
Run for 10 hours or change in bottle pressure of 120psi,
whichever comes first
EF4: 200 A
------------------------------
Post-boronization ECDC Parameters
------------------------------
Two hours in He
gas and pressure: He at 5e-5 Torr
sweep: 44/45/103 cm
scan: 20/120 s
Followed by One hour in D2
gas and pressure: D2 at 2e-4
sweep: 44/45/103
scan: 20/120 s
Engineering Setup:
------------------
Run begins at 09:00 and ends at 17:00
Power systems as on: 1040127010
Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid Enabled
Acoil start time set to 0.2sec
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)
fill NINJA with 10 psi D2 DISABLED
Enable gatevalves and shutters: ECE, VUV, DNB, Z-bolo
Torvac gatevalve toggle (yes/no): Open
Between shot Boronization available on request
Overnight ECDC (yes/no): yes (see above)
ICRF(yes/no): yes
LH(yes/no): no
DNB(yes/no): yes
Cryopump (yes/no): yes
*******************************************************************
* NOTE: We will start with cryopump ON and diborane bottle closed *
*******************************************************************
When/if we start between-shot boronization, we will need to warm
the cryopump all the way up to room temperature.
Physop Plan
-------------
The miniproposal calls for starting from 1040127010. I went through
the setup process starting from 1040127010 for the
MP#362 run on 1070517, (and screwed it up badly by not doing a build
before saving). That one had elongation backed off to 1.7 and current
down to 1.35MA. Since this was before f19 died, it will need recalculation
as well, but I won't have to reinvent everything. This shot was saved
as 1070517000 in my scratch area. The notes from that setup are:
Start with programming from 1040127010 segment 2 (and recalculate magnetic
predictors, including Ip; acknowledge warnings about DPCS tree features).
Put B21_PROJ feedback on wire 9, in place of "bolofeed":
1. In EDIT_WIRE screen, Load wire from a suitable recent source
2. On V#01-16 screen, zero the ACOIL_CUR waveform
3. Integrator Gates: Change start of C gate to 0.2sec
Move fast ZCUR feedback from wire 10 back to wire 3:
1. In Edit_Wire screen on wire 3, load wire from wire 10
2. Change derivative gain from to 5.0, P gain to 2.5
3. Zero wire 10.
Reduce Ip program from 1.65 to 1.35
Reduce CLEARIN program from +.005 to -0.005 (back off elongation)
Increase IC_EF4U program from 2000 to 3500A
Change Ref 9-12 from "Ip" to "10"
I propose to start from seg2 of 1070517000 (load the whole shot, then
import seg1 (and 3 and 4 from recent shots), recalculate magnetics
predictors, drop current to 1.2MA, increase nl04 target from 8e19 to
1e20. Based on a recent 1.2MA shot, change RCUR to .659 and CLEARIN to -.002
which gave 1cm outer gap and 7mm inner gap, with zcur=-.009 instead of 0.
That shot also had ZXU=+.05 instead of +.02. Comparison with shots at lower
current suggest we should be using an RCUR offset of ~10000a-m (of some sign?).
Assuming we have cryopump ready to go on shot#1, increase PG4 puff to 32msec.
Note also that there is a pulse on output 19 (diborane piezo) that needs
to be removed.
Tune shot for shape and gaps. Increase elongation to taste.
Get RF on as soon as possible.Aim for EDA H-mode using Prf=3.5MW
Things to adjust, depending on results:
a) Ip gain switch at 0.6 sec (delay it for volt demand)
b) CLEARIN, RCUR for gaps
c) ZCUR (make negative to reduce total elongation)
d) ZXU (make more positive to reduce total elongation)
Tuning the starting point should take 3-5 shots.
Increase current to 1.5MA, elongation to 1.75 (if it's not already there),
density to nl04= 1.25e20; still at Prf=3.5MW. Perhaps do this in two steps,
e.g. 1.35MA and kappa=1.7 first. NOte that may need to move rcur in as I raise
Ip.
Things to try (hopefully won't need all of them):
Equilibrium:
a) Raise IC_EF4U program to 4000 (or even 4500) as current increases
b) Slow down or delay CLEARIN, elongation changes relative to current rise.
c) Avoid voltage saturation due to too rapid current rise.
d) Consider shortening the Ip flattop to avoid power supply current limits
Stability:
e) increase slow ZCUR derivative gain (from 0.7 to 2.5, probably not all at
once), monitoring vertical stability traces - response to slow branch
f) increase P gain on IC_EF4, and/or decrease P gain on EF2_by_EF4 to try to
suppress EF2 oscillation contribution to slow branch of Zcur instability
g) Tweak fast ZCUR gains to suppress fast branch of vertical mode, if needed
Locked modes:
h) Watch out for early locked modes. Consider slowing down current ramp if
these appear to be present
i) Increase density to combat locked modes later in pulse.
If promising, increase RF power to max available, in .5MW steps
If we're still alive, increase current to 1.6MA, kappa=1.85 (ITER shape,
more or less).
|
| Session Leader Summaries |
| Entered: Aug 29 2007 05:09:50:613PM |
| Author: Earl Marmar |
| We explored a range of plasma currents (1.2 to 1.5 MA) with significant ICRF power. At the lower currents, we had some decent shots, although the RF was not steady for any. Probably the best shots were 10, 11 and 12 at 1.35 MA. All of the higher current shots disrupted before, during or shortly after the ICRF heating phase.
As we have seen in the past, the confinement (relative to ITER-89 L-mode scaling) in the ohmic L-mode phase decreases with increasing current. At 1.5 MA, it was below .6 (shot 14). At 1.45 MA, it was around 0.7 (shots 15, 17, 18 ,19 20, 22). In H-mode, H_89 does increase, to as high as 1.2 (shot 20). After banging away at 1.45 MA, we went back to 1.35 MA, to see how reproducible things were (the boronization was clearly wearing off, but it was too late in the day to consider between-shot boronization). Radiated power was up compared to the earlier shots (shot 26 compared to shot 12, for example) at this current(perhaps 50% on dPrad/dt just after L to H). On the lost shot (29) we increased the target density. The plasma was more EDA-like, RF was steady at 3 MW, and this was the highest stored energy shot of the day. W_tot reaches 223 kJ (H_89 ~ 1.4), and was still rising when the RF trips and there is a back transition to L-mode. |
| Physics Operator Summaries |
| Entered: Aug 29 2007 05:48:44:703PM |
| Author: Steve Wolfe |
Physop summary for Wed, 29-Aug-2007
MP#496 High performance operation at Ip>1.2MA
SL: Marmar
PO: wolfe
EO: Pierson, Pfeiffer, Parkin
The goal was to get high power (above 3.5MW) data at 1.5 to 1.6MA.
We were unsuccessful in running discharges into rampdown above 1.35MA,
and the rf was only marginally successful at getting power over 3.5MW,
and in fact had to reduce to 3MW later in the day to keep from faulting.
We did get (relatively) non-disruptive high elongation ITER-like shapes
at 1.2MA, 1.35MA. These were near double null and pretty much filled the
available space in the machine. Similar shapes at 1.5MA (and 1.45MA)
disrupted, some just into rampdown (which started at 1.15sec) and some
in flattop. I did make a small tweak to the fast zcur gains
(P from 2.5->3, D from 5->5.5) and increased the IC_EF4U gain,
which seemed to help the slow vertical mode some but did not cure
the disruptions which followed the H-mode phase. The disruptions did
tend to end as vde's, but I suspect that this was not the original cause.
I think these plasmas were too close to boundaries and were contacting as the
control got shaky around transitions and rf faults. We tried raising
q95 comfortably above 3 by raising B to 5.6T, but this didn't help either.
The nominal inner gap was around 5mm, and the outer gap around 1cm; could
have actually been closer, especially outside.
We got a number of shots with stored energy above 200kJ, but no new
records. The H-modes were all at high density (cutting off the ECE),
and had rather low H-factors. Prad was an obvious problem.
The cryopump was used all day and seemed to help the ICRF, although
we can't know since we didn't try a comparison shot without it. We
were running quite high target density (up to 1.5e20) and managed
not to exceed the neutral pressure limit on J antenna.
These shots all had some injections and radiated power was not low
even at the start of the day, and the boronization was clearly
getting worse as the day went on. Rate of rise of Prad was at least
50% higher at the end of the day than on similar targets around
shot 10-12.
Scorecard:
No power 1
Duds 2
fizzles 5
plasmas 21
======== ==
shots 29
|
| Session Leader Comments | |||
| Aug 29 2007 09:29:42:030AM | 1070829001 | Earl Marmar | start at 1.2 MA
boronization recovery cryopump cold fizzle - cryopump started outgassing just before t=0 |
| Aug 29 2007 09:51:19:170AM | 1070829002 | Earl Marmar | delays for cell entry (cryopump) and data system problems
stuck in init, no power shot |
| Aug 29 2007 10:27:16:757AM | 1070829003 | Earl Marmar | power supply dud (no OH2s) |
| Aug 29 2007 10:26:52:087AM | 1070829004 | Earl Marmar | dud |
| Aug 29 2007 10:47:09:477AM | 1070829005 | Earl Marmar | plasma
Got some power from J, D&E tripping Disrupt in rampdown (~.8 MA) |
| Aug 29 2007 11:04:31:457AM | 1070829006 | Earl Marmar | plasma
more power (up to 4 MW total, including ohmic, RF still trippy, but better Wmhd to 150 kJ, H89 ~ 1.1 |
| Aug 29 2007 11:11:07:683AM | 1070829007 | Earl Marmar | plasma
steadier RF, semi-EDA tending toward ELM-free, increase in radiated power just before 1 second 4 MW total (including ohmic) Wmhd to 200 kJ, H89 ~ 1.5 |
| Aug 29 2007 11:48:15:130AM | 1070829008 | Earl Marmar | Ip to 1.35 MA, nl_04 to 1.3e20
plasma disrupted during the flattop stored energy was heading up and then turned around with increasing radiation |
| Aug 29 2007 11:53:08:593AM | 1070829009 | Earl Marmar | plasma
survived but relatively poor confinement in H-mode; ELM-freeish |
| Aug 29 2007 11:57:15:067AM | 1070829010 | Earl Marmar | higher elongation
approaching double-null (SSEP ~ 0 mm) plasma steadier RF, better heating, Wmhd to 219 kJ, H89~1.35, total input power 4.4 MW |
| Aug 29 2007 12:33:43:970PM | 1070829011 | Earl Marmar | plasma
similar to shot 10 during H-mode a little more RF power, some trips Wmhd ~ 210 kJ long ohmic h-mode after RF turns off, then full current disruption |
| Aug 29 2007 01:11:43:900PM | 1070829012 | Earl Marmar | plasma
short periods at full power (total up to 4.3 MW including ohmic) Wmhd ~ 200 kJ |
| Aug 29 2007 12:50:57:383PM | 1070829013 | Earl Marmar | going for 1.5 MA
plasma early disruption, prior to programmed RF |
| Aug 29 2007 01:03:22:060PM | 1070829014 | Earl Marmar | plasma
early disruption, prior to programmed RF |
| Aug 29 2007 01:22:19:477PM | 1070829015 | Earl Marmar | reduce Ip target to 1.45 MA
plasma disrupts during ICRF pulse J-port trips |
| Aug 29 2007 02:24:42:657PM | 1070829019 | Earl Marmar | makes it through the ICRF, disrupts at start of rampdown
RF trippy, periods with 4.8 MW total input (including ohmic) H_89 ~ 1.1 |
| Aug 29 2007 02:36:53:470PM | 1070829020 | Earl Marmar | makes it through the ICRF, disrupts at end of flattop
RF steadier looks like an ELMy H-mode Wmhd 215 kJ H_89 ~ 1.15 total input power 5 MW |
| Aug 29 2007 03:55:44:857PM | 1070829022 | Earl Marmar | 5 MW total input (including ohmic)
Wmhd = 195 kJ H_89 ~ 1.01 disrupt at 1.0 seconds |
| Aug 29 2007 03:49:46:647PM | 1070829023 | Earl Marmar | disrupts at start of ICRF
|
| Aug 29 2007 04:31:58:460PM | 1070829025 | Earl Marmar | revisit shot 12
trippy RF |
| Aug 29 2007 04:56:35:297PM | 1070829028 | Earl Marmar | Fairly steady RF power (~3 MW)
Looks ELM free, density and radiated power ramping linearly Stored energy pretty constant (~190 kJ, drooping to 170 at the end of the H-mode) H_89 ~ 1.25 and decreasing to ~1. |
| Aug 29 2007 05:08:22:517PM | 1070829029 | Earl Marmar | On the lost shot (29) we increased the target density. The plasma looked more EDA-like, RF was steady at 3 MW, and this was the highest stored energy shot of the day. W_tot reaches 223 kJ, and was still rising when the RF trips and there is a back transition to L-mode.
H_89 ~ 1.4 (total input power 4.5 MW including ohmic) |
| Physics Operator Comments | |||
| Aug 28 2007 05:48:45:650PM | Steve Wolfe | Beginning setup for MP#496 run tomorrow. Load from previously saved setup 1070517000 in pcs_scratch Import seg1, seg3, seg4 from today's shot 1070828032 In seg2: Change title recalc predictors; do all of them, just to be sure. Do a build, catch two errors, fix em. Now for the new changes: Drop Ip from 1.35 to 1.2MA raise nl04 from 8e19 to 1.1e20 rcur from .6605 to .659 clearin from -.005 to -.002 (change it across the board, including the early phase where it had been at 0.0) Note that zxu is at 0.03 (Not 0.02 as I said in the PO_PLAN); leave it. In seg#1: PG4 from 19msec to 32msec (assuming cryopump will be on) Do another build_all save_as pcs_scratch/ 1070829000 LOAD into Model Filling in configuration /31-JUL-2007 17:52:43.27/ Filling in DPCS configuration /31-JUL-2007 17:46:18.39/ about to ask alcdata to copy /home/wolfe/pcs_scratch/pcs_model to /cmod/trees/models/pcs/pcs_model about to ask alcdata to copy /home/wolfe/pcs_scratch/dpcs_model to /cmod/trees/models/dpcs/dpcs_model Load at 28-Aug-2007 17:48:15.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Should be ready to roll. | |
| Aug 29 2007 07:38:03:857AM | Steve Wolfe | Revising the setup for first shot at 1.2MA Slow down nl04 rise to reach 1.1e20 at 0.6sec Reduce Zcur from 0 to -.008 to reduce elongation (raise it later in run) For reference, import seg2 from 1070822017 to seg4 about to ask alcdata to copy /home/wolfe/pcs_scratch/pcs_model to /cmod/trees/models/pcs/pcs_model about to ask alcdata to copy /home/wolfe/pcs_scratch/dpcs_model to /cmod/trees/models/dpcs/dpcs_model Load at 29-Aug-2007 07:37:41.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| Aug 29 2007 08:12:00:660AM | Steve Wolfe | Still tweaking at first shot setup- Reduce IC_EF4 from 3500 to 3000 for 1.2MA case Load at 29-Aug-2007 08:11:51.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| Aug 29 2007 08:25:18:867AM | Steve Wolfe | Note that Zcur3 gains are at P=2.5,D=5. Consider raising these to 3, 6; might want to push the D gain up to 7 or 8 based on Marco's results on 1070406, if we're seeing the fast branch. | |
| Aug 29 2007 09:07:37:493AM | 1070829001 | Steve Wolfe | Shot#1: Fizzle, cryopump came up. Pressure up to .064mTorr. Note that F19 had a big baseline offset so Mflux fields are bogus. Next: no changes, try again |
| Aug 29 2007 09:49:53:640AM | 1070829002 | Steve Wolfe | Shot#2: No power shot, dpcs failed in INIT |
| Aug 29 2007 10:13:48:237AM | 1070829003 | Steve Wolfe | Shot#3: Try, try again Dud- No OH2's. Perhaps we should try sacrificing a chicken |
| Aug 29 2007 10:27:02:257AM | 1070829004 | Steve Wolfe | Shot#4: Still trying, Bill thinks the OH2 problem will not recur Another dud. currents are all there, pressure is .028mTorr. Maybe just too low pressure. Next: raise pg4 to 36msec |
| Aug 29 2007 10:47:22:227AM | 1070829005 | Steve Wolfe | Shot#5: raise pg4 to 36msec If this doesn't at least flash will turn off cryopump plasma to 1.67sec, disrupts in rampdown Got some j-port rf, d&e faulting. H-mode at 1.17sec elongation up to 1.7, n/nc<1, q95~3.6 Current turns around briefly at 0.1sec, can raise program at seg switch. |
| Aug 29 2007 10:59:52:120AM | 1070829006 | Steve Wolfe | Shot#6: raise initial Ip point, slow down rampdown waveforms on clearin, RXU,ZXU. Leave pg4 alone plasma full length, got a longer h-mode ECE is cut off in the center, nebar is up to 4.5e20 wmhd around 150kJ Next: repeat |
| Aug 29 2007 11:09:12:650AM | 1070829007 | Steve Wolfe | Shot#7: No PCS change, let RF tune up one more shot plasma full length, three h-modes Stored energy over 209kJ, Got 3.5MW. Next: raise Ip to 1.35MA, raise Ar to 70msec Shorten RF pulse |
| Aug 29 2007 11:23:34:327AM | 1070829008 | Steve Wolfe | Shot#8: raise Ip to 1.35MA, EF4 from 3000 to 3500A nl04 to 1.3e20 raise Ar to 70msec Shorten RF pulse Disrupted at 0.9sec ay 1.35MA The argon boys are claiming it was Moly. |
| Aug 29 2007 11:40:17:900AM | 1070829009 | Steve Wolfe | Shot#9: reduce rcur from .659 to .657 Matt says the killer blow on 8 was NOT Mo. Plasma full length, multiple H-modes q95=3.2, kappa=1.70, n/n_c~1 Got to 3.5MW but only got to 165kJ; Prad is high. Next: raise Zcur to 0 |
| Aug 29 2007 11:54:02:377AM | 1070829010 | Steve Wolfe | Shot#10: raise Zcur to 0 leave argon at 70ms for now, delay rf 100ms plasma full length, hmode sustained for a while w=220kJ, density is peaking up during the H-mode kappa=1.82, n/nc < 1 during H-mode , q95=3.45 Nearly double null, upper triang over 0.6 interesing mhd seem on nl after h-mode. Next: increase rf power |
| Aug 29 2007 12:09:11:523PM | 1070829011 | Steve Wolfe | Shot#11: increase rf power to 4MW plasma disrupted at 1.45sec, in or just after (ohmic) hmode w=210kJ during ICRF phase, 145kJ in ohmic. Next: turn down the argon, begin rampdown at 1.1sec |
| Aug 29 2007 12:24:43:797PM | 1070829012 | Steve Wolfe | Shot#12: argon back to 40ms begin rampdown at 1.15sec also, move rxu out from -.023 to -.02 plasma ramped all the way down peak wmhd=196kJ, rf not happy, triangulatity down a little. q95=3.4, kappa=1.82 next: raise Ip to 1.5MA |
| Aug 29 2007 12:48:57:913PM | 1070829013 | Steve Wolfe | Shot#13: Ip to 1.5MA, nl04 to 1.4e20,ef4 to 4000 rcur in from .657 to .656, RXu from -.02 to -.018 delay Ip step from .6 to .65 Disrupted at .68sec, just under 1.5MA Got a baseline offset on F15 1.3e-3 I think the voltage jump at the Ip gain switch caused the disruption Voltage step on OH2U is bigger than the demand, possibly related to crossover? Next: raise second gain step from 2.6@0.356 to 4@0.360, delay final step to 9 from 0.65 to .7 |
| Aug 29 2007 01:03:33:140PM | 1070829014 | Steve Wolfe | Shot#14: raise second Ip gain step from 2.6@0.356 to 4@0.360, delay final step to 9 from 0.65 to .7 Disrupted again at .74sec Looks like the right gap is bigger than expected. It's still getting a big jerk from the final Ip gain switch, now at 0.7sec, and ends up going vertically. |
| Aug 29 2007 01:23:56:990PM | 1070829015 | Steve Wolfe | Shot#15: move rcur back out from .656 to .657 delay current flattop from .5 to .6 back Ip down to 1.45MA, just in case it's integral q problem disrupted at .95sec, in hmode Getting lots of vertical thrashes. Looks like the low frequency branch. Try raising zcur3 P gain from 2.5 to 3, D from 5 to 5.5 |
| Aug 29 2007 01:35:19:427PM | 1070829016 | Steve Wolfe | Shot#16: Try raising zcur3 P gain from 2.5 to 3, D from 5 to 5.5 Raise TF to 5.6T (156kA) Raise EF4 gain from 2 to 6 after 0.5sec (contra ef2_by_ef4 fizzle; big CIII signal, no burnout on halpha; got over 50kA Next: drop pg4 by 2ms |
| Aug 29 2007 01:55:46:847PM | 1070829017 | Steve Wolfe | Shot #17: dropped pg 4 from 36 to 34ms but pressure went up to .058 - fizzle. Possible cryo burp. Try again |
| Aug 29 2007 04:06:21:093PM | 1070829018 | Steve Wolfe | Shot #18: dropped pg 4 from 36 to 34ms Before this shot cmodws30 froze and had to be rebooted the hard way (pulling the plug) plasma disrupts at 1.1sec Looks like a lot of injections, MHD visible on soft xrays and ece I think the vertical problem is more stable, but can't really tell; it does go up eventually. Next: raise nl04 to 1.5e20 |
| Aug 29 2007 02:19:43:100PM | 1070829019 | Steve Wolfe | Shot #19: raise nl04 to 1.5e20 plasma disrupts at 1.17sec Next: back off zxu, reduce double nullness |
| Aug 29 2007 02:40:52:307PM | 1070829020 | Steve Wolfe | Shot #20:ZXU from .03 to .035 small tweaks to ranpdown clearin, rxl, ef4 plasma disrupts at 1.12sec, before rampdown wmhd=215kJ, ELMy H-mode kappa=1.81, q95=3.4, Next:? |
| Aug 29 2007 03:22:15:277PM | 1070829021 | Steve Wolfe | Shot #21:Zxl from -.0175 to -.02, zcur from 0 to -.003, tweak clearin in rampdown fizzle, after nearly an hour delay. drop pg4 another 2ms |
| Aug 29 2007 03:41:47:493PM | 1070829022 | Steve Wolfe | Shot #22: pg4 from 34 to 32ms Zxl from -.0175 to -.02, zcur from 0 to -.003, tweak clearin in rampdown disruption at 1.0sec got to 196kJ, kappa=1.77, q95=3.25 Next: raise slow zcur P gain |
| Aug 29 2007 03:47:37:597PM | 1070829023 | Steve Wolfe | Shot #22: Zcur2 P gain from .75 to 1.5 disrupts at .85sec, looks worse. Slow mode is worse, so that's the wrong way on zcur gain. Next: retreat to shot#12 (1.35MA) |
| Aug 29 2007 04:00:38:303PM | 1070829024 | Steve Wolfe | Shot #23: reload seg2 from shot#12 drop pg4 from 32 to 31ms fizzle. CIII high, no Halpha burnout. Next: down to 30ms |
| Aug 29 2007 04:17:23:627PM | 1070829025 | Steve Wolfe | Shot #25: pg4 from 31 to 30ms Still working on the repeat of shot#12 (1.35MA) plasma full length, unsteady H-modes Not much success for rf, wmhd<160kJ q95=3.4,kappa=1.83, close to DN |
| Aug 29 2007 04:27:17:500PM | 1070829026 | Steve Wolfe | Shot #26: repeat plasma full length Long H-mode, but RF dies early (except for D gets to 212kJ during rf, Next: try one with no argon |
| Aug 29 2007 04:40:19:097PM | 1070829027 | Steve Wolfe | Shot #27: repeat with no argon, Yijun will try to keep rf on disrupts at 1.1sec gets to 209kJ, Next: drop pg4, drop power on J |
| Aug 29 2007 04:51:20:710PM | 1070829028 | Steve Wolfe | Shot #28: pg4 from 30 to 28ms plasma full length wmhd=198kJ, prf~3MW, somewhat steadier Prad high and going up. Next: raise target density |
| Aug 29 2007 05:06:20:560PM | 1070829029 | Steve Wolfe | Shot #29: nl04 from 1.3 to 1.45e20 disrupts at 1.05sec, got to 225kJ, rf stays on until just before 1sec, at 3MW END OF RUN |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:03:21:330AM | Plasma | Ok | |
| 2 | 09:48:44:247AM | Test | Bad | |
| 3 | 10:10:02:060AM | Plasma | Bad | No OH2 upper or lower |
| 4 | 10:22:28:983AM | Plasma | Ok | |
| 5 | 10:35:02:457AM | Plasma | Ok | |
| 6 | 10:49:47:857AM | Plasma | Ok | |
| 7 | 11:02:25:483AM | Plasma | Ok | |
| 8 | 11:16:49:177AM | Plasma | Ok | |
| 9 | 11:31:13:213AM | Plasma | Ok | |
| 10 | 11:44:45:203AM | Plasma | Ok | |
| 11 | 11:59:51:667AM | Plasma | Ok | |
| 12 | 12:18:20:193PM | Plasma | Ok | |
| 13 | 12:32:46:247PM | Plasma | Ok | |
| 14 | 12:49:40:087PM | Plasma | Ok | |
| 15 | 01:15:32:890PM | Plasma | Ok | |
| 16 | 01:29:04:013PM | Plasma | Ok | |
| 17 | 01:41:43:360PM | Plasma | Ok | |
| 18 | 01:55:44:063PM | Plasma | Ok | |
| 19 | 02:11:16:667PM | Plasma | Ok | |
| 20 | 02:24:38:530PM | Plasma | Ok | |
| 21 | 03:18:01:440PM | Plasma | Ok | |
| 22 | 03:30:58:053PM | Plasma | Ok | |
| 23 | 03:43:43:450PM | Plasma | Ok | |
| 24 | 03:56:20:873PM | Plasma | Ok | |
| 25 | 04:08:55:223PM | Plasma | Ok | |
| 26 | 04:21:37:383PM | Plasma | Ok | |
| 27 | 04:34:09:980PM | Plasma | Ok | |
| 28 | 04:47:09:233PM | Plasma | Ok | |
| 29 | 04:59:35:550PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Aug 29 2007 09:02:54:957AM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||