| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Dennis Whyte |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Bill Parkin,Gary Dekow |
| Engineering Operator Run Comment |
| Characterization and Optimization of I-mode: EO Pierson, PO Wolfe, SL Wh |
| Session Leader Plans |
| Entered: Sep 14 2009 02:01:30:000PM |
| Author: Dennis Whyte |
| Characterization and Optimization of I-mode
---------------------------------- Day 1 The purpose of these experiments is to characterize the necessary parameters to obtain I-mode (a.k.a. enhanced L-mode) while documenting I-mode plasma characteristics and optimizing I-mode towards its application in Alcator C-Mod for high confinement at low density. The experiment will focus on expanding the available I-mode operating space by exploring the effects of shaping, density, q95, and Ip with a goal of obtaining basic scaling relationships for further use on C-Mod and possible exploration on other devices. USN, #1080416015 reference shot (shape) Cryopump ON Toroidal Field: 5.0 â?? 5.8 T (clockwise) Plasma Current: 0.8 â?? 1.4 MA Working Gas Species: D2 Density: Target NL04 densities from 0.3 to 1 (1e20) Boronization Requested: NO ICRF Power: > 5 MW, Each shot will have 4 steps in RF of 250 ms each. Diagnostics: ECE with varying B field Edge TS with alignment for pedestal/edge as reference shot Note: DNB is offline so no pedestal diagnosis available from CXRS Run Plan Today will focus on obtaining the dependences of I-mode on plasma parameters at fixed shape of 1080416015. The shot sequence is as follows I'll used this notation to id shots. 1. B scan 3 shots Reference shape: #1080416015, Ip=0.8 MA, NL04 target = 0.8e20. 250 ms Prf steps: 2.5, 2.6, 2.7, 2.8 Scan Bt a) 5.4 T (q95 ~4.66) b) 5.8 T (q95 ~5.0) c) 5.0T (q95 ~4.3) 2. Ip scan at fixed q95 and density { 1c forms first part of scan} 3 shots Reference shape: #1080416015, q95 ~ 4.3, NL04 target = 0.8e20 a) Ip = 0.85 MA, B = 5.31 T, 250 ms Prf steps: 2.6, 2.7, 2.8, 2.9 b) Ip = 0.9 MA, B = 5.63 T, 250 ms Prf steps: 2.7, 2.8, 2.9, 3.0 c) Ip = 0.95 MA, B = 5.94 T, 250 ms Prf steps: 2.8, 2.9, 3.0, 3.1 3. Ip and q95 scan at fixed B and density {2b forms part of scan) 5 shots Reference shape: #1080416015, NL04 target = 0.8e20, Bt = 5.63 T a) Ip = 0.8 MA, q95 ~ 4.8, 250 ms Prf steps: 2.5, 2.6, 2.7, 2.8 b) Ip = 1.0 MA, q95 ~ 3.9, 250 ms Prf steps: 3.1, 3.2, 3.3, 3.4 c) Ip = 1.15 MA, q95 ~ 3.36, 250 ms Prf steps: 3.4, 3.6, 3.8, 4.0 d) Ip = 1.25 MA, q95 ~ 3.1, 250 ms Prf steps: 3.9, 4.1, 4.3, 4.5 e) Ip = 1.35 MA, q95 ~ 2.9, 250 ms Prf steps: 4.3, 4.6, 4.9, 5.2 4. Density scan at high Ip / low q95 (3e forms part of scan) N.B. ordering of density scan is reversed from MP Reference shape: #1080416015, Ip = 1.35 MA, Bt = 5.63 T 6 shots a) NL04 = 0.5e20, Prf steps: 4.3, 4.6, 4.9, 5.2 (or lowest density achievable) b) NL04 = 0.6e20, Prf steps: 4.3, 4.6, 4.9, 5.2 c) NL04 = 0.7e20, Prf steps: 4.3, 4.6, 4.9, 5.2 d) NL04 = 0.9e20, Prf steps: 4.3, 4.6, 4.9, 5.2 e) NL04 = 1.1e20, Prf steps: 4.3, 4.6, 4.9, 5.2 f) NL04 = 1.3e20, Prf steps: 4.3, 4.6, 4.9, 5.2 5. Density scan at low Ip / high q95 (3b forms part of scan) Reference shape: #1080416015, Ip = 1.0 MA, Bt = 5.63 T 6 shots a) NL04 = 0.3e20, Prf steps: 3.1, 3.2, 3.3, 3.4 (or lowest density achievable) b) NL04 = 0.4e20, Prf steps: 3.1, 3.2, 3.3, 3.4 c) NL04 = 0.5e20, Prf steps: 3.1, 3.2, 3.3, 3.4 d) NL04 = 0.6e20, Prf steps: 3.1, 3.2, 3.3, 3.4 e) NL04 = 0.7e20, Prf steps: 3.1, 3.2, 3.3, 3.4 f) NL04 = 1e20, Prf steps: 3.1, 3.2, 3.3, 3.4 |
| Physics Operators Plans |
| Entered: Sep 14 2009 01:13:45:843PM |
| Author: Steve Wolfe |
Physop plan and Engineering setup for Tuesday, Sep 15, 2009
MP#579 Characterization and optimization of I-mode (Day#1)
SL: Whyte
PO: wolfe
*************************************************************
-----------------
Engineering Setup
-----------------
Run begins at 09:00 and ends at 17:00
Note: We will need the cryopump operating from the first shot and
throughout the day.
Power systems as on: 1080416015 with the following changes:
TF Current limit to 175kA
Fizzle detector gate on:0.08, off:2.10
TF invert time=3.0 sec
OH1, OH2U, OH2L invert times to 2.3 sec
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)
fill NINJA with 10 psi D2 DISABLED
Enable gatevalves and shutters: ECE, VUV, HIREX_SR, Z-bolo
Torvac gatevalve toggle (yes/no): No
Boronization(yes/no): no
Overnight ECDC (yes/no): yes
ICRF(yes/no): yes
LH(yes/no): no
DNB(yes/no): NO
Cryopump (yes/no): YES
Vessel temperature: 35/35/35
------------------------------
ECDC Parameters (if requested)
------------------------------
Vessel temp: 60/60/60 for ECDC
gas and pressure: D2 at 2e-4 Torr
sweep: 44/45/103 cm
scan: 20/120 s
************************************************
Physop plan:
Import seg3 (USN) from 1080416015
Recalculate magnetics predictors
Recalculate NL04 predictor (feedback a little off on reference shot)
Add derivative gain to NL04
Change NL04 target from 0.7e20 to 0.8e20 ?(Check w/SL)
Reduce Argon puff to 50msec
Use Seg1 from 1090909020 (had cryopump).
Set TF cur back to 150kA, tweak other settings to taste.
Follow the run plan as indicated in the MP:
1. BT scan:
RF staircase 2.5,2.6,2.7,2.8MW
a) BT=5.4, Ip=800kA (TF=150kA)
b) Bt=5.8 " (TF=161kA)
c) Bt=5.0 " (TF=139kA)
2. Ip scan at fixed q95~4.3 *(see SL_PLAN/MP for RF program)
a) Ip=850, Bt=5.31 (TF=147.5kA)
b) Ip=900, Bt=5.63 (TF=156.4kA)
c) Ip=950, Bt=5.94 (TF=165.0kA)
3. Ip and q95 scan at fixed Bt=5.63 (TF=156.4kA)
a) Ip=800kA, q95=4.8
b) Ip=1.0MA, q95=3.9
c) Ip=1.15MA, q95=3.36 *Likely need to increase OH limits for rest of 3,4
d) Ip=1.25MA, q95=3.1
e) Ip=1.35MA, q95=2.9
4. Density scan at Ip=1.35MA, Bt=5.63. Note different order from MP
a) NL04=0.5e20 *may need to tweak B21_PROJ?
b) NL04=0.6e20
c) NL04=0.7e20
d) NL04=0.9e20 (did 0.8 in 3e)
e) NL04=1.1e20
f) NL04=1.3e20
5. Density scan at Ip=1.0MA, Bt=5.63T
a) NL04=0.3e20 (or as low as we can get)
b) 0.4e20
c) 0.5e20
d) 0.6e20
e) 0.7e20
f) 1.0e20 (did 0.8 as 3b)
|
| Session Leader Summaries |
| Entered: Sep 15 2009 06:13:49:117PM |
| Author: Dennis Whyte |
| We got less than halfway through the shot plan.
A combination of a power supply hardware problem, some early disruptive injections and some server issues in the afternoon slowed our progress, but we did get some interesting data. Several hardware systems worked great. ICRF was providing reliable power steps. The cryopump worked well through the day to maintain constant plasma density NL04~0.8e2. One goal of today was to better characterized the H-mode avoidance. As usual one has to live with scatter in P_LH. The first scan was in B, keeping Ip=0.8 MA shot B P-LH RF step q95 9 5.4 2.86 #4 4.7 12 5.8 3.65 #4 4.9 15 5.0 2.8 #1 4.4 15 5.0 3.2 #4 4.4 So this is a bit confusing. We typically found today that the first heating step could trigger H-mode, which would return to L-mode and not trigger H-mode again until step #4. Also the result is not monotonic in B (using only Step #4 results) It is hard to explain this away by different ICRF absorption since stored energies look close in this scan. Of course this does not rule out a q95 dependence (rather than a Ip dependence) which takes us to the next scan shot B P-LH RF step q95 Ip 15 5.0 3.2 #4 4.4 0.8 18 5.6 2.8 #1 4.4 0.9 18 5.6 3.3 #4 4.4 0.9 19 5.9 3.3 #4 4.4 0.95 Using only the step #4 results we see the threshold appears constant at fixed q95. q95 / Ip scan shot B P-LH RF step q95 Ip 18 5.6 3.3 #4 4.4 0.9 20 5.6 3.5 #4 4.0 1.0 27 5.6 >3.9 #4 3.54 1.15 This then appears consistent with an increase in Plh as q95 decreases (preliminary conclusion). The most interesting shots for "I-mode" were at lower q95 (#20, #27) - high Te pedestal - a large variety of coherent edge oscillations from PCI and reflectometry - H98 ~ 1 |
| Physics Operator Summaries |
| Entered: Sep 15 2009 05:56:09:400PM |
| Author: Steve Wolfe |
Physics Operator Summary for Tuesday, Sept 15, 2009
MP#579 "Characterization and optimization of I-mode"
SL: Whyte
PO: wolfe
This turned out to be an even more difficult run than I expected.
We got only as far as step 3.c of the run plan, the 1.15MA case, and didn't
get a clean result on that one.
The day started with a power supply interlock fault (spurious type2 fault
indication on OH1) which turned out to be a faulty solid state relay. The
first plasma shot went off at about 10:00, and it turned out that the F15 flux
loop had not been re-installed after it was zapped last night, so the shot
ended up riding the outer limiter for the full shot, with plenty of rf
power. It was actually a sort of interesting shot, but not one we would want
to repeat.
After Bob reconnected f15, we took a number of shots trying to establish the
baseline reference condition (step 1a). It was necessary to move the rxl in
by 1cm to get the outer strike away from the leading edge. Once that was done,
the elongation was slightly too low, and when I increased it by lowering zcur
by 1cm we got a series of disruptions due to W injections. This was very
strange, since there was no power going to the lower divertor. However,
raising zcur back up by 5mm seemed to eliminate the injections. It seems
possible (speculation) that the lower divertor region whereever the broken W
piece is was magnetically connected to one of the antennas in the SOL. Maybe
this is a clue to where the problem is.
We finally got a satisfactory result with the refererence case at
shot#9. In addition to some difficulty finding the I-mode and H-mode
threshold, we also were getting runways that were extremely robust. I had some
success by raising the pg4 puff (as high as 65msec and increasing the seg1
pg3 puff, but they always came back. Startup with the cryopump wasn't too bad,
although the pressure at t=0 varied considerably from shot to shot and was
non-linear (or not well-correlated) with the pg4 pulse. I tried moving the
end of the pre-puff from -.5 to -.3, which put t=0 at the max of the pressure
instead of on the pumpout, and this may have helped some.
One thing I found (again) was that raising the D gain on the nl04 was very
helpful in damping the feedback oscillation and smoothing out the density and
puff rate with the cryopump active. Most of the run used D=6. which was quite
successful until I mucked with the program on the last few shots.
We made it through step 1a-c by shot 15, just after 13:00. Three out of 23
conditions and half the day gone! So we started skipping steps and moved on to
2b, the 900kA, 5.63T case. Around this point, we had a data system delay
associated with the fast magnetics server going down. That ended up costing us
about another hour (with several repeated no-power shots that didn't even use
up a shot number). We ended the day with the amhd cpci nodes turned off. Josh
and Ted are working on trying to get the computer back on-line as I type
this.
We finished 2b (shot#18) and 2c (950kA, 5.94T) on shot#19, and started on the
fixed field current scan (step 3) beginning with the 1.0MA case on
shot#20. This ran ok, got it well enough on the one shot. However when we
moved up to 1.15MA at 8e19 we got hit with locked mode disruption early in the
flattop. By this time post-disruption fizzles were becoming a serious
problem. I tried increasing the weight on the ef3L component of the b21_proj
predictor, which had worked last week, but the locked mode still came in
around .45sec, during the dip in density that followed the rather late
diversion which was programmed for this shot. I managed to get one shot (#27)
to run without a locked mode by raising the early density program to reduce,
though not eliminate the dip and overshoot in the density, but the repeat shot
(#29 after a DUD on 28) disrupted early again, this time apparently due to an
injection, with no sign of a locked mode or other systemic problem.
Despite the difficulties and the small fraction of the run plan completed,
some interesting results were obtained. See the SL summary details. I expect
that operation at the higher current points of step 3 and the low density
points of the high current density scan of step 4 will be problematic, and may
need some more tweaking of the locked mode acoil algorithm.
NOTE that the programming on shot#23 through 29 has a hand-tuned weight of
-2.2e-8 instead of -1.2e-8 on the EF3L current component. This may or may
not be better than the calculated value.
Scorecard:
----------
(Not counting shot numbers that got taked twice)
Tests/No power 3
Duds 1
Fizzles 6
plasmas 19
-------- --
Shots 29
|
| Session Leader Comments | |||
| Sep 15 2009 10:12:28:307AM | 1090915002 | Dennis Whyte | Flux loop was disconnected so it looks like
we were probably outer wall limited (cannot accurately reconstruct EFITs anyway). This resulted in a large hot-spot on the GH limiter which looks like the problem area we sometimes get with RF heating. Cryopump was working in early flattop to reduce the density |
| Sep 15 2009 10:23:19:260AM | 1090915003 | Dennis Whyte | Disruption at 0.7 s. From bolometry and
cameras (Wide2) the concern seems to be melting in the upper divertor. Outer gap was a bit big and inner gap a bit too small next shot: move the start of RF heating from 0.5 to 0.7 ms to let the plasma "settle in" a bit more. Move upper strikepoint away from pump entrance a bit more to avoid heating of the gapped tiles. |
| Sep 15 2009 10:30:15:867AM | 1090915004 | Dennis Whyte | Fizzle. Cryopump burped |
| Sep 15 2009 11:35:57:633AM | 1090915006 | Dennis Whyte | Higher elongation on this shot (1.65)
Disrupted by W injection at 1.3 s. Got H-mode at 2.8 MW. No sign of I-mode fluctuation. |
| Sep 15 2009 11:46:32:743AM | 1090915007 | Dennis Whyte | Higher elongation on this shot (1.65)
Recovered from injection at 1.3 s (W again) The I-mode (is it really) recovered from the injection Still no sign of fluctuation |
| Sep 15 2009 11:48:29:680AM | 1090915008 | Dennis Whyte | Disruption again from W injection
Seems to be at same point in time so worried this has something to do with this shape. Steve Wolfe is tweaking the elongation lower to avoid Got H-mode transition at 2.7 MW... it seems very slight shot to shot variations change P_LH |
| Sep 15 2009 11:51:35:947AM | 1090915009 | Dennis Whyte | Shot ran through with no injections. Change
to shape seems minimal (kappa ~ 1.65, delta ~ 0.7) so not sure what was "fixed" got nice constant L-mode with H98~0.9 H-mode transition at 2.9 MW at 1.47 s This will constitute 1(a) in our scan |
| Sep 15 2009 12:13:26:337PM | 1090915010 | Dennis Whyte | 1(b)
Ran through. No H-mode at this higher field H98~0.8 No sign of I-mode fluctuation. Will increase power on next shot to get H-mode |
| Sep 15 2009 12:20:40:460PM | 1090915011 | Dennis Whyte | 1(b)
No H-mode up to Prf=3.1 MW H98~0.9 No sign of I-mode fluctuation. Will increase power on next shot to get H-mode starting at 3.1 MW and steps of .15 MW. |
| Sep 15 2009 01:09:47:540PM | 1090915012 | Dennis Whyte | 1(b) Good
H-mode transition at 3.6 MW Injection at 1.35 s, but L-mode recovered Weak sign of I-mode fluctuation on BP01GHK (70 kHz) H98~0.95, W ~ 97 kJ, |
| Sep 15 2009 01:06:59:417PM | 1090915014 | Dennis Whyte | 1(c) Good
Did not get H-mode even at ~ 2.8 MW H98~0.95, W ~ 93 kJ No sign of fluctuation on magnetics. |
| Sep 15 2009 01:25:37:807PM | 1090915015 | Dennis Whyte | 1(c) Good
H-mode transition to ELM-free H-mode at 2.7 MW in first step Then after collapse back to L-mode due to impurity buildup we got something that looks like I-mode (H98 ~1, ~100 kJ) then another H-mode transition at 3 MW Weak sign of I-mode fluctuation on BP01GHK (70 kHz) The B dependence is not apparent from 5 to 5.4 T, whil B~5.8 clearly had higher threshold. Also note that early RF power is more efficient at H-mode triggering than later. |
| Sep 15 2009 02:45:27:023PM | 1090915018 | Dennis Whyte | Starting Ip/Bt scan at constant q95~4.3
900 kA, 5.6 Tesla Like in previous shots we seem to get H-mode at low power in beginning phases of the flattop. An ELM-free H-mode transitioned back to L-mode which then remains in L-mode despite higher power than earlier in flattop?? At ~1.2 seconds we have 111 kJ, H98~1.. killed by an injection Fast magnetics lost |
| Sep 15 2009 04:53:55:587PM | 1090915019 | Dennis Whyte | 2C Good
H-mode at 3.3 MW |
| Sep 15 2009 03:25:14:790PM | 1090915020 | Dennis Whyte | 3(b)
(skipping 3a since we have lots of data at 800 kA previously in day) 100 kA, 5.6 Tesla, q95 ~ 4 H-mode at 3.5 MW just at beginning of 4th Rf step Broadband coherent mode on relectometry at frequency 75 GHz On H-alpha we apparently type-I ELMs in L-mode, some are related to sawtooth crash, but not all of them. W ~ 136 kJ, H98~1, H89 ~ 1.5 |
| Sep 15 2009 04:10:48:180PM | 1090915025 | Dennis Whyte | Issues with density control in early phases
of discharge are leading to a locked-mode |
| Sep 15 2009 04:44:36:510PM | 1090915027 | Dennis Whyte | 3c Good
Did not get H-mode up to 3.9 MW RF Coherent fluctuations showing up on reflectometer channels Density control was not optimal but we got steady target density after ~1.1 s up to the impurity injection at 1.35 s Pedestal Te (GPC 09) up to ~0.8 keV W~150 kJ, H98~1 |
| Physics Operator Comments | |||
| Sep 15 2009 07:26:36:863AM | Steve Wolfe |
Begin setup for MP#579 run=1090915
Import seg1 from 1090909020
TF_CUR to -150kA from -152.8
PG4 at 50msec
RCUR from 2000 to 1000
Br0 at .0005 (ok)
IC_EF4U at -1300 (ok)
Import SEG 2 (because otherwise, I'll screw up) from Seg3 of 1080416015
Recalc predictors: rcur,zcur(2), zcur(3), clearin, rxl, zxl, rxu, zxu.
Recalc nl04 predictor as well (call, fill in 1.0 for nl04, ok)
Note factor on row 2 changes from 1.9685 to 1.85185e-20;
change value to 1.850, just to see a change.
Build_all to check for omissions; No warnings.
Back in seg2:
Add D=3 gain to NL04
Change nl04 target from 7 to 8e19
Remove pg3 puff feedforward ~0 across
reduce pg1 from 75 to 50msec
Load at 15-Sep-2009 07:26:16.00
Open tree /home/wolfe/pcs_scratch -1
Open tree done
| |
| Sep 15 2009 09:07:06:550AM | 1090915001 | Steve Wolfe | Shot#1:target Bt=5.4, Ip=800kA, nl04=8e19, cryo on, rf with four small steps Base pressure before cooling cryo is 2.5e-7, better increase the puff a little. PG4 to 55msec Load at 15-Sep-2009 08:41:48.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done 3.5e-8 at cryo ready->INIT Type2 fault on OH1 in INIT that won't clear. NO POWER SHOT Note: Gas valves fire, ratiomatic reading .08mTorr at t=0 with no fields. |
| Sep 15 2009 10:08:14:917AM | 1090915002 | Steve Wolfe | Shot#2:target Bt=5.4, Ip=800kA, nl04=8e19, cryo on, rf with four small steps Second try. No dpcs changes. Long delay while Bill tries to solve the Type2 fault problem. They are replacing a solid state relay. plasma, lots of h-modes, disrupts at 1.25sec F15 does not have finite signal; did Bob plug it back in last night? Some hesitation in startup. Lots of what looks like ELMs on the Halpha I think it's outboard limited, efit thinks it's diverted, but it's missing the fluxes. Next: Bob claims he has now plugged f15 back in, so try again. |
| Sep 15 2009 10:21:11:227AM | 1090915003 | Steve Wolfe | Shot#3:target Bt=5.4, Ip=800kA, nl04=8e19, cryo on, rf with four small steps Pg4 from 55 to 52msec IGT=1.9e-7 at cryo ready plasma disrupts at 0.7sec, prad comes up at .63sec shape looks nominal, but there seems to be an interaction in the upper diveror tiles. Matt sees Mo. Next: move plasma out, and RXU in. |
| Sep 15 2009 10:31:16:540AM | 1090915004 | Steve Wolfe | Shot#4: move plasma out, Rcur from .655 to .656 clearin from -.0045 to -.0025 and RXU in from -.03 to -.04, and start at .4 instead of .5sec PG4 from 52 to 48msec Delay start of rf pulse. fizzle, cryopump burped, ratiomatic to .16mTorr at t=0 My fault, PO wasn't ready at ten minutes. Next: repeat |
| Sep 15 2009 10:49:22:103AM | 1090915005 | Steve Wolfe | Shot#5: Repeat setup from #4: move plasma out, Rcur from .655 to .656 (probably should have moved more) clearin from -.0045 to -.0025 and RXU in from -.03 to -.04, and start at .4 instead of .5sec PG4 from 52 to 48msec 1.9e-7 on IGT at INIT 1.7e-7 in check plasma full length, h-mode at 1.38, nl04 a little low but oscillating. could increase D gain little injection right as rf turns on. Looks pretty good. H98=.85 on my scope, Dennis is claiming .92 probably an rffrac discrepancy. Next: increase D gain on nl04 from 3 to 6 Maybe change field? |
| Sep 15 2009 11:07:11:320AM | 1090915006 | Steve Wolfe | Shot#6: increase D gain on nl04 from 3 to 6 pg5 from 48 to 45msec, increase elongation by dropping zcur from 0 to -.01 plasma runaways. disrupts at 1.3sec, h-mode at .77sec Got the higher elongation while it lasted, ~1.65 Ratiomatic down to .08 at t=0, needed more puff. Not sure why it disrupts? Matt claims W injection? Next: Raise the puff? |
| Sep 15 2009 11:16:52:993AM | 1090915007 | Steve Wolfe | Shot#7: pg4 from 45 to 50msec, reduce rf power 2.1e-7 in check Still some runaways, need more early gas. plasma runs full length but injection at 1.3sec almost kills it. Next: increase pg4 to 55msec |
| Sep 15 2009 11:27:49:480AM | 1090915008 | Steve Wolfe | Shot#7: pg4 from 50 to 55msec, seg1 pg3 increase after 70msec increase pg1 (argon from 50 to 75) otherwise repeat 1.9e-7 in check Still runaways, disrupts at 1.3, same thing Next: move zcur up to -.005, increase pg4 again |
| Sep 15 2009 11:41:03:663AM | 1090915009 | Steve Wolfe | Shot#9: pg4 from 55 to 60msec, move zcur up to -.005, see if the injections go away. Move integrator C gate to 0.2sec from 0.5 B21_proj (leftover cruft!) 2.6e-7 at init Still runaways, but the big injection is gone. Now we have an H-alpha burst at .5 to .6sec, nice flat plasma, h-mode at ~1.5sec Next: change field ? |
| Sep 15 2009 11:57:37:650AM | 1090915010 | Steve Wolfe | Shot#10: pg4 from 60 to 65msec, still trying to kill the runaways TF from 150 to 161 (5.8T) Change A-coil on time from 0.3 to 0.2sec (engineering) plasma full length, still runaways. No h-mode, q95=5 Next: seg1 rcur offset back to 2000. keep pushing pg4 |
| Sep 15 2009 12:18:28:307PM | 1090915011 | Steve Wolfe |
Shot#10: seg1 rcur offset back to 2000.
Move pg4 puff from -.5 to -.3, leave width at 65msec (should increase p by 20%)
Data system hold per jas request; holding off on cooling cryo until
he gives the go ahead.
IGT=1.7e-7 in INIT
1.4e-7 in CHECK
plasma full length, no runaways! Well, hardly any, under 1e12
Ratiomatic .14mTorr at t=0
No h-mode, Looks like we're going to repeat.
Next: Repeat at same field, more rf
|
| Sep 15 2009 12:30:51:273PM | 1090915012 | Steve Wolfe | Shot#12: Repeat at same field, more rf. NO DPCS changes. IGT=2.1e-7 at INIT plasma runaways are back disrupts at 1.6sec in rampdown. Big injection at 1.38sec possible H-mode 1.45sec Next: Lower field to 5.0T |
| Sep 15 2009 12:49:52:980PM | 1090915013 | Steve Wolfe | Shot#13:Lower field to 5.0T TF_CUR to -139kA PG4 from 65 to 70msec IGT=1.7e-7 in INIT fizzle ratiomatic was off I don't think Cryo burped but can't be sure. Next: back down to 65msec, increase pg3 in seg1 |
| Sep 15 2009 01:05:02:870PM | 1090915014 | Steve Wolfe | Shot#14:Lower field to 5.0T TF_CUR to -139kA PG4 from 70 to 65msec, pg3 up until 0.1sec IGT=1.1e-7 at INIT plasma full length no h-mode no runaways K limiter is still showing heating, although neuts/hards is below 1e12. hesitation in startup, barely made it, I'm on the edge. Next: drop pg4 a bit, repeat with more rf |
| Sep 15 2009 01:15:23:743PM | 1090915015 | Steve Wolfe | Shot#15: PG4 from 65 to 62msec Repeat with more RF at B=5.0 IGT=2.1e-7 at INIT 1.9e-7 in check plasma full length, 2 h-modes, no runaways Improved (?) I-mode in between. Next: Move on to step 2! |
| Sep 15 2009 01:38:07:807PM | 1090915015 | Steve Wolfe | Shot#16: Ip from 800 to 900, TF from 139 to 156.4 (step 2b, skipping 2a) No changes in seg1 Delay for ECE lab acess to change gratings. Lost fast magnetics on last shot, path to server down. No word from Josh. Probably needs a reboot or power cycle. No AMHD'ers in the room either. And they hang up in INIT, and still no Josh. Doing a no power, I'll turn the node off until somebody shows up. |
| Sep 15 2009 01:58:35:667PM | 1090915015 | Steve Wolfe | Shot#16: Second try at this. Had Bill restart the cycle, not restart servers. I've turned off the AMHD cpci branch. Ip from 800 to 900, TF from 139 to 156.4 (step 2b, skipping 2a) No changes in seg1 Didn't work. Another no power Josh is back |
| Sep 15 2009 02:06:50:650PM | 1090915017 | Steve Wolfe | Shot#17:Third try at this. Ip from 800 to 900, TF from 139 to 156.4 (step 2b, skipping 2a) No changes in seg1 Josh still working on amhd, can't get it to let him login. And the INIT did'nt arm a bunch of other stuff, so we need another NO POWER |
| Sep 15 2009 02:20:24:320PM | 1090915017 | Steve Wolfe | Shot#17: Data system test cycle to see if it's really fixed without having to re-open the breakers and re-cool the cryopump And it isn't fixed, so Josh goes back to work. |
| Sep 15 2009 02:31:16:180PM | 1090915018 | Steve Wolfe | Shot#18: Yet another try at 2b. Ip from 800 to 900, TF from 139 to 156.4 (step 2b, skipping 2a) No changes in seg1 Still no active mhd fast magnetics for this one. IGT=8.3e-8 in INIT plasma full length, no runaways, H-modes. Long L(I?)-mode interval between the h-modes. Long hesitation in startup, almost lost it. Next: pg4 down to 60msec, not sure what SL will want for plasma |
| Sep 15 2009 02:43:13:603PM | 1090915019 | Steve Wolfe | Shot#19: pg4 from 62 to 60msec, Ip to 950kA, TF to 165 (step 2c) plasma full length with a late h-mode a few early runaways (12scale). Startup smooth, ratiomatic pressure down to .13 (was over .15 last time) Next: I'm guessing we go to step 3? |
| Sep 15 2009 03:00:34:383PM | 1090915020 | Steve Wolfe | shot#20: go to step 3b: Back to 5.63T (156.4kA),go to 1MA no seg 1 changes (it will either fizzle or the xrays will come back) Runaways are back, but plasma ran to 1.7sec H-mode at 1.25sec Next: 1.15MA, same field, increase pg4 a tad |
| Sep 15 2009 03:11:46:820PM | 1090915021 | Steve Wolfe | shot#21: go to step 3c 1.15MA, IC_EF4U from 2000 to 2500 pg4 from 60 to 63msec fizzle. No ratiomatic again, so I don't know if it was pressure or just dirt from the rampdown disruption. Next: repeat |
| Sep 15 2009 03:27:14:070PM | 1090915022 | Steve Wolfe | shot#22: go to step 3c 1.15MA, IC_EF4U from 2000 to 2500 pg4 still 63msec plasma disrupts at .8sec, right after rf comes on. minimal runaways early. Possible locked mode at .79sec Also an injection at .78sec Next: try tweaking up the b21_proj predictor |
| Sep 15 2009 03:41:11:837PM | 1090915023 | Steve Wolfe | shot#23: EF3L weight on b21_proj from -1.2e-8 to -2.2e-8 (Seemed to work last week) decrease pg4 from 63 to 60msec Cryopump only down to 3.5e-7 at INIT, after that disruption BP04_BC had a small offset after the disruption, probably ok fizzle, disruption recovery. |
| Sep 15 2009 03:49:23:117PM | 1090915024 | Steve Wolfe | shot#24: repeat EF3L weight on b21_proj from -1.2e-8 to -2.2e-8 (Seemed to work last week), decrease pg4 at 60msec IGT=2.1e-7 at INIT (better?) fizzle again. Drop fill some more? |
| Sep 15 2009 04:09:53:883PM | 1090915025 | Steve Wolfe | shot#25: PG4 from 60 to 55msec EF3L weight on b21_proj from -1.2e-8 to -2.2e-8 (Seemed to work last week) IGT=1.5e-7 at INIT Another disruption, .8sec, still has a locked mode starting at 0.45sec, Acoil comes up, but doesn't seem to help. Next: raise programmed density to 8e19 at .218sec, so we don't get the early gas turn-off |
| Sep 15 2009 04:11:04:510PM | 1090915025 | Steve Wolfe | shot#25: PG4 from 60 to 55msec (Actually 50) EF3L weight on b21_proj from -1.2e-8 to -2.2e-8 (Seemed to work last week) IGT=1.5e-7 at INIT Another disruption, .8sec, still has a locked mode starting at 0.45sec, Acoil comes up, but doesn't seem to help. Next |
| Sep 15 2009 04:15:13:150PM | 1090915026 | Steve Wolfe | shot#26: raise programmed density to 8e19 at .218sec, so we don't get the early gas turn-off This one will probably fizzle, but I don't want to go below 50msec on pg4 yet Fizzle. |
| Sep 15 2009 04:37:35:243PM | 1090915027 | Steve Wolfe | shot#27: Go ahead and drop pg4 from 50 to 45msec programmed density to 8e19 at .218sec, so we don't get the early gas turn-off Back ef4 off to 2000 again, just to undo the only other change for #22 (let ef2_by_ef4 take care of itself). I've stopped getting magnetics warnings after #22, nothing in the logfile of note except bp04_bc, and it's still small. plasma into rampdown, density wobulating more than before, looks unstable feedback, need to push the D up some more? Still getting the initial drop as it goes diverted. Maybe add some feedforward pg3 to that, around .3 to .4sec I think the locked mode is gone. |
| Sep 15 2009 04:44:18:460PM | 1090915028 | Steve Wolfe | shot#28: Nl04 D gain from 6 to 9 (equal to P) Add a 30V puff between .28 and .4, when feedback turned off on previous shot No seg1 change IGT=2.1e-7 at CHECK fizzle. so much for benign neglect. Essentially NO current, this was a dud. Fields look ok, maybe gas was too low. Of course, ratiomatic was off again, but I think cryopump was pumping. Next: Raise(!) pg4 |
| Sep 15 2009 05:03:29:133PM | 1090915029 | Steve Wolfe | shot#29: PG4 from 45 to 53msec Nl04 D gain from 6 to 9 (equal to P) Add a 30V puff between .28 and .4, when feedback turned off on previous shot IGT=1.5e-7 at CHECK, Disrupts early again, .61sec, doesn't look like a locked mode. Still has the density dip, so that didn't cure it. Disrupts before the rf comes on. Injection of something at .611sec on 2pi |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:00:54:367AM | Plasma | Bad | OH1 type 2 fault would not clear in INIT |
| 2 | 09:58:53:213AM | Plasma | Ok | |
| 3 | 10:11:25:243AM | Plasma | Ok | |
| 4 | 10:27:10:180AM | Plasma | Ok | |
| 5 | 10:41:31:510AM | Plasma | Ok | |
| 6 | 10:57:35:930AM | Plasma | Ok | |
| 7 | 11:10:48:273AM | Plasma | Ok | |
| 8 | 11:23:52:587AM | Plasma | Ok | |
| 9 | 11:36:51:603AM | Plasma | Ok | |
| 10 | 11:52:20:727AM | Plasma | Ok | |
| 11 | 12:13:11:477PM | Plasma | Ok | |
| 12 | 12:26:02:493PM | Plasma | Ok | |
| 13 | 12:44:39:243PM | Plasma | Ok | |
| 14 | 12:57:59:180PM | Plasma | Ok | |
| 15 | 01:11:11:400PM | Plasma | Ok | |
| 17 | 02:03:36:117PM | Test | Ok | |
| 18 | 02:25:44:197PM | Plasma | Ok | |
| 19 | 02:38:37:400PM | Plasma | Ok | |
| 20 | 02:54:10:807PM | Plasma | Ok | |
| 21 | 03:07:34:743PM | Plasma | Ok | |
| 22 | 03:20:05:070PM | Plasma | Ok | |
| 23 | 03:33:33:947PM | Plasma | Ok | |
| 24 | 03:46:18:260PM | Plasma | Ok | |
| 25 | 03:58:50:400PM | Plasma | Ok | |
| 26 | 04:13:03:587PM | Plasma | Ok | |
| 27 | 04:25:43:087PM | Plasma | Ok | |
| 28 | 04:40:03:667PM | Plasma | Ok | |
| 29 | 04:53:10:103PM | Plasma | Ok | |
| System Availability | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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