| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Chuck Kessel |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Bill Parkin,Sam Pierson,Gary Dekow |
| Engineering Operator Run Comment |
| MP574 ITER like dicharges at reduced Ip/Bt |
| Session Leader Plans |
| Entered: Jan 20 2010 03:44:23:910PM |
| Author: Chuck Kessel |
| MP 574 SL Run Plan:
Goals â?? develop ITER-like discharges at reduced Ip/Bt in order to access n/nGr, betaN, q95, etc. simultaneously to the extent possible Toroidal Field: 2.7 T Plasma Current: 0.55-0.63 MA Working Gas Species: D Density: Target 4.5e19 m-2, variable Equilibrium configuration (if possible, refer to database equilibria): Utilize MP585 1091117011 or 1091117024 ICRF Power, pulse length, phasing: up to 5 MW, 80 MHz, 1.5 s duration LHCD Power, pulse length, phasing: none Pellet Injection (species): no Impurity blow-off injection: no Diagnostic Neutral Beam: Highly desirable Special gas puffing: NINJA (with D2) should be available. Non-axisymmetric Coils (Connections, Current); Yes; optimized to reduce locked modes. Essential: Thomson, Magnetics, Hard x-rays, ECE, TCI, HIREX, bolometers. ECE will not work for 2.7 T 1. Recover discharge 1091117011 or 1091117024, WITHOUT ICRF (Bt = 3.4 T), Ip = 600 kA a. Maintain large bore plasma and early divert timing b. Introduce a ramp in TF from 3.4 to 2.7 T, over about 100 ms, beginning at crowbar time (40 ms) â?? subject to physop adjustment 2. Adjust Ip to reach q95 of ~ 3.0 at end of Ip rampup and sustain in flattop, and adjust the rampup time to 350 ms, plasma elongation targeting 1.75 a. End of flattop is 1.5 s b. End of rampdown is 2.0 s 3. Inject ICRF at 350 ms, conditioning up ICRF power level to maximum (5 MW?), hold steady through flattop phase, trying to establish EDA H-modes in flattop â?? time will be required to get ICRF up to full steady power a. Raise density request at 350 ms to higher values to get flattop H-mode and raise flattop density values, establish L-mode, H-mode onset and EDA H-mode onset â?? use nl04 = 4.5e19, 5.5e19, 6.5e19, 7.5e19â?¦. b. Examine betaN reached in H-mode flattop c. Examine density reached in H-mode, n/nGr = 0.85 in ITER corresponds to about 3.1-3.5 x 10^20 /m3 (or nl04 ~ 2e20) in C-Mod d. NOTE: end of rampup in ITER is n/nGr = 0.3-0.35, corresponding to 1.0 x 10^20 /m3 (or nl04 ~ 5.8e19) in C-Mod 4. Inject ICRF power steps in rampup phase, timing may be varied, try to remain in L-mode in ramp, and then transition to H-mode at or near end of ramp, control density request with baseline at nl04 = 4.5e19 /m2 (or other value identified in step 3) â?? maintain high power H-mode phase in the flattop a. 1.0 MW from 120 ms to 350 ms b. 1.0 MW from 120 to 170 ms, 2.0 MW from 170 ms to 350 ms c. 1.0 MW from 120 to 170 ms, 2.0 MW from 170 ms to 220 ms, 3.0 MW from 220 to 350 ms 5. If time remains, move H-mode onset earlier in ramp by having density for H-mode onset earlier, with stepped power established in step #4. |
| Physics Operators Plans |
| Entered: Jan 20 2010 10:44:07:020AM |
| Author: Steve Wolfe |
| Engineering Setup and Physics Operator Plan for Thursday, Jan 21,2010
MP#574: ITER-like discharges at reduced Bt SL: Kessel PO: wolfe -------------------------------------- Overnight Boronization Parameters -------------------------------------- foreline(TC6) pressure request: 80 mTorr sweep (rmin/rdwell/rmax): 44/52/103 cm scan: 60/120 s Pulser set .7on/.3off dP: 120 psi EF4: 0 A Post-boronization ECDC ----------------------- 1st Gas Setup: Gas: He sweep: 44/45/103 cm scan: 20/120 s Pressure: 5e-x5Torr Duration: 2 HRS 2nd Gas Setup Gas: D2 sweep: 44/45/103 cm scan: 20/120 s Pressure: 2e-4 Torr Duration: 2 HRs (or finish by 07:30AM) ----------------- Engineering Setup ----------------- Run begins at 09:00 and ends at 17:00 Power systems as on: 1091117024 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 H-bottom with 2psi Ne Hybrid DISABLED (PG5) fill NINJA with 10 psi D2 DISABLED Enable gatevalves and shutters: ECE, VUV, HiREX Sr, Z-bolo, B-spectrometer Torvac gatevalve toggle (yes/no): No Boronization(yes/no): YES (see setup above) Overnight ECDC (yes/no): post-boronization (see setup above) ICRF(yes/no): YES, All transmitters LH(yes/no): no Cryopump (yes/no): no Vessel temperature: 35/35/35 ------------------------------------------- Physop Plan: ------------- Load shot from 1071117022 from Ian and Chuck's last low-field run. Note that crowbar is at 40msec, seg switch at 80msec and seg1 and 3 are active. Target parameters for first shots are 600kA, 2.7T (75kA), BOF moved to 0.35sec, nl04=5e19 (?). Note that Ian was tweaking up voltages in seg1 and early seg3 throughout the 1091117 run, generally resulting in improved shaping, reduced overshoot in clearin, better vertical stability. The last 600kA case with ohmic ramp-up was #11, last 600kA shot with RF in ramp was#24, Shot#32 (seg2) was lower current and ramp RF. The tweaks between 22 and 24 were reducing the oh1_volt, which is contrary to the faster current rise Chuck is calling for. Changes from 16 to 22 were mainly reducing seg1 EF1V, and somewhat the EF2V. I think the main point is to get early divert and minimize the jumps at seg switch, although these remained. Also note that somehow these seg3 programs have asymmetric EF2_VOLT. It looks like the EF2U is similar to the EF1's. This seems to have been inherited from 1090911030! EF2L is zero in seg3, while EF2U starts from +6.4V@.077sec, down to -50@.1sec, up to zero at 0.2sec I will start from the programming in #22 and make adjustments accordingly: In seg1: Reduce TF current to 75kA after .02sec Copy seg3 to seg2, turn off seg3, turn on seg2, change title to 2.7T: V01-16: Reduce TF current to 75kA Zero out PG3 puff between .13 and .41sec Copy EF2L into EF2U All P's: Change BOF from .5sec to .35sec Slow down rampdown a little (0.5sec total) Change nl04 from 8e19 to 5e19 Run off a shot and see what we get. Expect to need to adjust current for q95=3.2, Tweak up Zcur program to maintain elongation. May need to adjust xpoint location for divertor strikepoint. This will correspond to Step #3 of SL_PLAN. RF can start tuning up later in shot. Step#4 (SL_PLAN): Begin RF at BOF (0.350sec), aiming for max available power. Raise nl04 to try to get EDA, continue raising nl04 to increase n/nG in H-mode. Consider turning on PG5 (neon) puff to reduce heat-load on divertor, injections, help RF, etc. Depending on results, consider changing to N2. Step#5 (SL_PLAN): Reduce nl04 in ramp-up to 4.5e19, inject RF during ramp per SL_PLAN, trying to remain in L-mode until BOF. May need to reduce early OH1V, EF1V as on 1091117024. |
| Session Leader Summaries |
| Entered: Jan 21 2010 06:09:17:910PM |
| Author: Chuck Kessel |
| MP574 ITER-like Discharge Studies at Reduced Bt
007 600 kA, ohmic discharge, ran all the way thru, Bt = 3.4 T, recover 1091117011 011 600 kA, ohmic, ran all the way thru, ICRF conditioning in flattop, Bt = 2.8 T 013 600 kA, ohmic, disrupts at 1.3 s, Bt = 2.7 T, density rising with ICRF in late flattop but no H-mode, q95 = 3 rising to 3.5 at EOF 015 600 kA, ohmic, disrupts at 1.42 s, increased kappa, Bt = 2.7 T, H-mode tries to get going at 1.1 s, after ICRF conditioning injection 016 600 kA, 2 MW steady ICRF heated beginning at 350 ms, Bt = 2.7 T, late H-mode in flattop, almost getting EDA-ish 017 600 kA, 2 MW the n drops to 1.5 MW ICRF, no H-modes, Bt = 2.7 T, higher density request 019 600 kA, 3 MW ICRF dropping out later, wee H-mode trying to form earlier, Bt = 2.7 T 020 600 kA, 3 MW ICRF, dropping down later in flattop, early ELM-free H-modes, high peak betaN around 1.5, n/nGr = 0.75, Bt = 2.7 T tried turning J-port off, but it was not the sole cause of problems 023 600 kA, 2.5 MW ICRF not steady thru flattop, ELM free H-modes forming and dying thru flattop, Bt = 2.7 T 025 600 kA, 3 MW ICRF dropping to 2 MW later, ELM-free H-modes begin forming at 350-400 ms, Bt = 2.7 T 028 reduce to 550 kA, to raise q95 and see if EDA H-modes can be reached, Bt = 2.7 T 032 550 kA at 350 ms, slow rise to 600 kA, lots of ELM-free H-modes after ICRF power reaches 2.5 MW from 800 to 1500ms, q95 now staying above 3.25, Bt = 2.7 T 033-036 same current rise as 032, 2-2.5 MW ICRF at 350 ms making LOTS of ELM-free H-modes beginning at 350 ms, Bt = 2.7 T Developed new discharges at lower Ip/Bt that provide q95 = 3 for ITER-like discharge studies. Goal of this was to access n/nGr = 0.85 and betaN = 1.5 simultaneousoy with q95 = 3. Progress was made toward this, but we could not get EDA regulated H-modes, only a large number of ELM-free H-modes. However we never got EDA H-modes at 1.35 MA / 5.4 T either in ITER-like discharges. The low q95 was identified as the problem, since it appeared from shots on 1091117, EDA's could be gotten with q95 = 4 at 600 kA / 3.4 T. The maximum betaN reached transiently was 1.5 and the maximum n/nGr was 0.75. The power threshold for the H-modes appeared to be 2.0-2.5 MW, but the density for H-modes might be about nl04 = 6.5-7e19. We did not get EDA, so the nl04 = Ip/1.e6 did not do much for these discharges. Revisting this would require scanning q95 from say 4.0 and going down to understand how to hold on to EDA H-modes if possible. |
| Physics Operator Summaries |
| Entered: Jan 21 2010 06:13:43:973PM |
| Author: Steve Wolfe |
Physics Operator Summary for Thursday, Jan 21, 2010
MP#574 ITER-like discharges at reduced Bt
SL: Kessel
PO: wolfe
EO: Parkin, Pierson, Dekow
The run got off to a rough start because the low-field startup
had problems following the overnight boronization. After a series of
fizzles, I reloaded a normal startup shot for shot#6 (#32 from 1100120),
which worked perfectly (#5 was a dud because I reloaded the programming
of 1100120032 but forgot to tell the EO to reload the engineering
setup).
I then started over at low field on shot#7,
loading directly from 1091117011 (before the additional tweaks Ian
added up to #22 on that day), and ran it without modification successfully.
However, when I changed over to segment #2 prepared for today, including
TF at 75kA and faster Ip ramp, it gave another fizzle, even though
nothing had been touched in segment#1. After a few more fizzles and some
gas tweaks, shot#11 ran full length. The next few shots, while I tuned
up the field and equilibrium in segment 2 had alternating fizzles and plasmas.
These cleared up by shot#15, and we then got 21 out of 22 successful
startups for the rest of the day. The lesson seems to be that while
the 3.1T breakdown startup is robust with good wall conditions, even
against disruptions, the post-boronization behavior is problematic.
It might be worthwhile in future to do four or five post-boronization
clean-up shots with a standard startup before going to the low-field
startup. Since RF will normally want at least that many discharges
for conditioning anyway, this procedure should not cost that much extra
time against the planned experiment, and may save considerable frustration
on the part of the Physop.
Note that the correct TF current for 2.7T seems to be 70.8kA, not 75kA
as I loaded originally. Ramp-up to 600kA at 350 to 400msec was satisfactory.
Some adjustments to the equilibrium to more closely approximate the ITER
shape and q95 were made during the day, but since we continue to need to
avoid the normal strike region because of the broken W tiles, the elongation
was not well-matched.
Even after the startup problems were cured, the run did not go smoothly.
There were numerous disruptions, apparently due to metal injections. On
many occasions these were visible coming from the J-port antenna, but
we also had several which did not show up on the wide 2 camera, including
ones with J-port turned off. Only D-port antenna was able to perform
at high power. J was restricted to ~1MW or less to try to avoid the
injections, and E had faulting (arcs) at all power levels, down to 200kW.
We never got decent EDA H-mode conditions. The closest we had we early
in the day on shot#16 at 2MW ICRF. The H-mode transition was late, after
1sec, as the density rose on its own from the programmed 5e19 to 9e19.
There were two h-modes, the second looking EDA-ish, and the density
reached over 3e20/m^3 (n/nG > 0.7), while BetaN got to 1.2, which seemed
promising since this came with only 2MW of RF. However, all we got the
rest of the day were multiple, very short, ELM-free H-modes which
radiated away in under 100msec. We varied the target density over
a factor of about two, up to nl04=1e20, without success. One or
two shots were tried at reduced Ip=550kA, to see if raising the q95
would help, but this was not sufficient. (More or less) steady power
levels between 2 and 3MW were tried. On the last few shots, Wukie
exercised the antennas up to an intermittent 5MW during the ramp-down,
in an effort to condition away and/or diagnose the problems with E and J.
On shot#33 the RF was ramped up to a rather ratty 4MW during the pulse;
H-modes were still short and ugly, but betaN reached 1.4 (Wmhd~60kJ).
The H-bottom plenum was not available, but the B-side upper was
loaded with 2psi neon, and I tried this on shot#30 (75msec starting
at 0.3sec, just before the RF); however the shot disrupted early, and
even though #31, without neon, also disrupted at the same time with the
same radiation signature, we did not try the neon magic again. We also
did not try turning off the argon puff, which was on most of the day.
It is apparent that the radiation was too high in the H-modes in these
discharges, despite the boronization. It is not clear if the boronization
effect was destroyed by the multiple disruptions or if there is another
problem, such as impurity evolution from fast ion loss orbits, associated
with 2nd harmonic ICRF heating at low current. The GH limiter midplane
was getting significant heating, despite a large outer gap. Aaron Bader
was getting data on the CNPA and reported that there were ions up to
800keV, but not as high as on fundamental proton resonance heating cases
he has looked at previously. More quantiative analysis of his
results may be helpful. Most likely, the major problem is the usual
one of getting EDA at q95 less than 4. However, we did not get the
chance to run a lower current case for comparison. Chuck points out
that last November he was able to get 600kA EDA's at 3.4T and 50MHz
heating. If these plasmas are revisited, we should probably due a
current scan to at least q95~4 to see if we can get back to EDA conditions.
Scorecard:
----------
Tests/No power shots 0
Duds 1
Fizzles 10
Plasmas 25 (9 flattop disruptions)
=============== ==
Shots 36
|
| Session Leader Comments | |||
| Jan 21 2010 11:39:46:853AM | 1100121011 | Chuck Kessel | 011 good shot, shot went thru
rampup in 350 ms, kappa drifting up and making q95 drift up may need to raise kappa earlier and raise Ip to get q95 toward 3.0 |
| Jan 21 2010 12:02:25:683PM | 1100121013 | Chuck Kessel | 013 good shot, disrupts at 1.3 s from injection?, but good repro of 011 with Bt = 2.7 T (011 had Bt = 2.8 T)
conditioning up RF, L-mode plasma |
| Jan 21 2010 12:32:44:497PM | 1100121015 | Chuck Kessel | 015 good shot, disrupts at 1.42 s, radiation consistently higher in this shot compared during ICRF to 013
plasma tries to enter H-mode with ICRF power, but drops out kappa is a little higher throughout flattop, nice q95 in good range |
| Jan 21 2010 12:47:42:027PM | 1100121016 | Chuck Kessel | 016 shot goes all the way thru, GOOD
ICRF was at 2 MW from 0.35 to 1.5 s steady plasma enters H-mode late in flattop, EDA-ish |
| Jan 21 2010 01:48:45:683PM | 1100121020 | Chuck Kessel | 020 shot all the way thru, good kappa, Ip, q95
ICRF getting up to 3.0 MW not quite steady, drops to lower power after 1.0 s betaN touching 1.5, but ELM-free H-modes early in flattop J-port showing some injections |
| Jan 21 2010 02:31:22:497PM | 1100121023 | Chuck Kessel | 023 shot all the way thru
ICRF getting up to 2.5 MW not quite steady lots of H-modes in flattop, none sustained or good quality J-port at 0.5 MW seems OK, rest from D+E |
| Jan 21 2010 02:35:28:620PM | 1100121024 | Chuck Kessel | 024 shot ended early at 700 ms
ICRF getting back up to 3.0 MW (0.5 MW from J-port) not steady H-modes trying to form at 350 ms as desired |
| Jan 21 2010 03:47:55:213PM | 1100121028 | Chuck Kessel | 028 shot went thru
lower Ip to see if higher q95 triggers EDA better, q95 > 3.25 ICRF not keeping steady at 3 MW early H-mode but drops out |
| Jan 21 2010 04:46:08:700PM | 1100121034 | Chuck Kessel | 034 shot went thru
lower Ip early then slow ramp to 600 kA to keep q95 > 3.25 ICRF requesting steady at 2.5 MW H-modes start earlier, but LOTS of ELM-free H-modes betaN peaks around 1.3 |
| Physics Operator Comments | |||
| Jan 20 2010 04:21:16:660PM | Steve Wolfe |
Setting up for tomorrow's run, following the PO_PLAN I posted earlier
this morning.
load from 1091117022
Import seg2 from seg3 of 1091117022
Seg3 off, Seg2 on
Seg1:
Reduce TF from to -75kA at 0.07sec starting from -96kA at .02sec
leave pg4 at 19msec
leave pg3 puff as is (max< 20V)
Seg2:
V01-16:
TF current from -93500 to -75000
Zero pg3 waveform
Copy EF2L_volt to EF2U_volt (zero in seg2)
All_Ps:
Move beginning of flattop from .50 to .35, EOF to 1.5, zero at 2.0
NL04 from 8e19 to 5e19
Async_PROS: remove dpcs_xjump routine (obsolete)
Build_All
Save as alcdata-test::/cmod/trees/test/pcs/ and ../dpcs shot 1100121000
Should be ready for tomorrow
| |
| Jan 21 2010 07:40:23:500AM | Steve Wolfe | Setting up for today's run. There were problems keeping the magnetron on for boronization last night, so they didn't finish until 5AM. He ECDC is still on at 07:15, we will do D2 ECDC until 8:30, which may delay the start of the run slightly. In PCS, load from 11100121000 saved yesterday. Note that while I've moved Ip flattop to start at .350sec, the RCUR, CLEARIN, RXL, and ZXU waveforms are still evolving, as is the EF4U program. EF4U gain doesn't drop to its final value of 2.0 until 0.5sec, either. ZXL is programmed to ramp during the shot, as is ZCUR, and these are already starting their ramps by then. Leave these waveforms as is until we get a shot, since the main change is going to be in the required loop voltage. Note startup settings: PG4=19msec RCUR offset=0. (!) BR0 offset=0. (note that Br_0 looks a little negative (-.5mT) on 1091117022) EF4 = -1340. EF1's= -6085. Load it and wait. | |
| Jan 21 2010 08:55:44:900AM | Steve Wolfe | Tommy reports that the H-bottom plenum pressure transducer failed during the shutdown, so we cannot use H-bottom for the possible neon puffing. Also during the shutdown, B-side upper lost integrity and the He3 ended up being pumped out, so we can use the B-side Upper (PG2) for neon puff, if we want. The response time on this valve is probably somewhat longer, and we previously had some difficulty using neon from there, but this may have been due to the cryopump effect. We'll give it a try. | |
| Jan 21 2010 09:11:49:620AM | 1100121001 | Steve Wolfe | Shot#1: Attempt at low-field (3.1T) startup, followed by lower field (2.7T) flattop, modified from 1091117022. RF off until 1sec (if we get that far). pressure 1e-6 at CHECK after 1hour D2 ECDC ended at 08:30. Result: Fizzle, slow lumpy H-alpha, no Ip rise. breakdown time looks good 5.6msec BR_0 a bit negative, similar to the 1091117 shot. Shot 1100121001: mag_bp_coils.signals:bp04_bc has a baseline offse t 1.7E-02 This one is being used for control Next: drop pg4 and set BR_0 offset to .0005 |
| Jan 21 2010 09:23:45:323AM | 1100121002 | Steve Wolfe | Shot#2: drop pg4 from 19 to 17msec and set BR_0 offset to .0005 fizzle, more halpha but still slow evolution. BR_0 up by about .3mT I think it's a gas problem associated with the boronization and late ECDC, but not sure which way to go. Keep going down until it duds |
| Jan 21 2010 09:38:39:527AM | 1100121003 | Steve Wolfe | Shot#3: drop pg4 from 17 to 15msec; EF4 from -1340 to -1350 (Bz looks just a little positive). Result: fizzle, looks almost identical. Next: leave fields as is, raise pg4 to 22msec |
| Jan 21 2010 09:49:44:150AM | 1100121004 | Steve Wolfe | Shot#4: raise pg4 from 15 to 22msec, see if it needs more gas Result: No change in anything but pressure. Light signals look identical, still no current rise. Next: reload a full field case from yesterday, just to get it going, clear the boronization effect if any, then come back to the low field startup. |
| Jan 21 2010 10:03:27:540AM | 1100121005 | Steve Wolfe | Shot#5: Load from 1100120032: start at 5.4, ramp down to 3.5T RF not to fire on this one. This isn't going to work after crowbar, forgot to have Bill load the eng setup. Too late now, let it go. Dud. That shouldn't have happened! Except the TF starts at -.5sec, so it was a low-field startup with bad fields. Next: try that again, with the correct engineering setup. |
| Jan 21 2010 10:26:02:870AM | 1100121006 | Steve Wolfe | Shot#6: Load from 1100120032: start at 5.4, ramp down to 3.5T RF not to fire on this one. Still trying to get a startup. Note that the apparent difference in Bz_0 is < 5mT, resulting in a dud. That's a clue, maybe. Result: plasma to 1.6sec, startup looks fine, still no clue what's wrong with the low-field case. Ohmic EDA h-mode at .7sec. OH2L oscillates after fizz cuts in. gives out of range error. Next: load from 1091117011 (3.4T shot) and work from there, if it will go. |
| Jan 21 2010 10:33:32:900AM | 1100121007 | Steve Wolfe | Shot#7: load from 1091117011 (3.4T shot) and work from there, if it will go. Remember active segments are 1 and 3! Result: plasma full length! Damned if I know what's different. Halpha rise is still slow, but it's lower than on 1-4. Next: Import seg2 from shot1 and turn it on (TF to 2.7, faster ramp,...) |
| Jan 21 2010 10:52:35:290AM | 1100121008 | Steve Wolfe | Shot#8: Import seg2 from shot1 and turn it on (TF to 2.7, faster ramp,...) Leave seg1 as is for now, so the TF won't start down until 80msec. Fizzle! I didn't touch segment 1. Looks like it bounced at 12msec It was starting to burn out. Breakdown was a little earlier on this one. Next: repeat |
| Jan 21 2010 10:58:47:260AM | 1100121009 | Steve Wolfe | Shot#9: repeat, see if it comes back on its own repeats the fizzle. Lasts a little longer, gets to 40kA, hits at 15msec. Next: raise pg4 |
| Jan 21 2010 11:13:16:807AM | 1100121010 | Steve Wolfe | Shot#10:raise pg4 from 19 to 22msec fizzle. Made it a little further, still looks like an outside bounce. Br is negative, but no sign of a vertical excursion. next: raise pg4 to 25msec |
| Jan 21 2010 11:32:40:370AM | 1100121011 | Steve Wolfe | Shot#11:raise pg4 from 22 to 25msec If 7 hadn't run, I would be changing fields. plasma full length. Startup looks good, just like #7. No bounces. RF comes on at 1sec, small intermittant H-modes after 1.2sec Btor comes out as 2.86, need to drop TF to 70.8kA Elongation is only 1.6, could stand raising ZCUR |
| Jan 21 2010 11:46:45:370AM | 1100121012 | Steve Wolfe | Shot#12: drop TF to 70.8kA hold zxu at .02 (had been going up to .03) fizzle, can't get two in a row! looks like too much gas this time. pressure went up 20% at t=0. breakdown was a bit late, 7.3msec Next: pg4 from 25 to 23msec |
| Jan 21 2010 11:58:22:137AM | 1100121013 | Steve Wolfe | Shot#13: pg4 from 25 to 23msec TF in seg2 to 70.8kA zxu at .02 (had been going up to .03) plasma to 1.3sec, got rf from E and J, D has problems. No gas puff after 0.22sec, nl04=6 before rf, 9 during. Next: drop pg4, raise Zcur |
| Jan 21 2010 12:11:12:040PM | 1100121014 | Steve Wolfe | Shot#14: pg4 from 23 to 20msec Zcur to zero after .54sec Waited for IGT to come back down to 2e-6 before INIT. Fizzle. looks like a bounce, maybe I shouldn't have dropped the gas. Next: pg4 back to 23 |
| Jan 21 2010 12:30:54:667PM | 1100121015 | Steve Wolfe | Shot#15: pg4 from 20 to 23msec Zcur at zero after .54sec IGT=1.3e-6 at INIT (10 minutes in recool) plasma to 1.43sec, Halpha and density rising with RF Looks like a couple of H-modes after 1.1sec. kappa reaches 1.7 later in shot, still around 1.65 before RF. getting a very small amount of fueling in flattop before 0.7sec. Next: move ICRF earlier. |
| Jan 21 2010 12:38:41:247PM | 1100121016 | Steve Wolfe | Shot#16: move ICRF earlier, 2MW from BOF No PCS changes, it will fizzle anyway. 12 minutes in recool, IGT=2.5e-6 at INIT plasma full length, on an even numbered shot! H-mode starts at 1.04sec, RF nice and steady at 2MW Next: raise nl04 to 8e19 |
| Jan 21 2010 12:55:50:887PM | 1100121017 | Steve Wolfe | Shot#17: raise nl04 from 5e19 to 8e19 IGT=3.0e-6 in INIT (12 minutes) plasma full length No h-mode, 2MW until D-faults at 1.1sec, glitch around .5sec could be crossover,big injection then Next: raise RF to 3MW, leave otherwise alone. |
| Jan 21 2010 01:14:40:290PM | 1100121018 | Steve Wolfe | Shot#18: raise RF to 3MW, leave otherwise alone. IGT=3.5e-6 at INIT (10 minutes in recool) disrupts at .566sec, same injection, dies during crossover, looks like we were getting an h-mode starting 0.48sec Next: decrease nl04 to 7e19 |
| Jan 21 2010 01:27:01:840PM | 1100121019 | Steve Wolfe | Shot#19: decrease nl04 to 7e19 plasma full length, J-port is spewing all through the shot also faulting on and off. D faults out by .8sec One brief H-mode at .56sec A few early hards. Crossover delayed to .66sec, probably not implicated. Next: back off on J power, RF will try to match D better. No PCS changes |
| Jan 21 2010 01:39:47:450PM | 1100121020 | Steve Wolfe | Shot#20: back off on J power, RF will try to match D better. No PCS changes Plasma full length J still spewing, multiple H-modes between .45 and .85sec This time D hangs in there, E faults out after 1.05sec betaN gets up to 1.5 during the brief H-modes. Next: drop J to 1MW, total to 2.5MW |
| Jan 21 2010 01:51:32:603PM | 1100121021 | Steve Wolfe | Shot#21: drop J to 1MW, total to 2.5MW IGT=3.7e-6 at INIT (10 min. in recool) plasma to .39sec, big injection seen from J-port. Bouncy startup Next: turn off J, just D+E for 2MW |
| Jan 21 2010 02:04:54:103PM | 1100121022 | Steve Wolfe | Shot#22: turn off J, just D+E for 2MW See what this does, then consider turning on some Ne puff and see if it helps J. Disrupts at .42sec, not from J this time. startup still bouncy, some hards. The strike is moving up the plate nearly tangentially, maybe interacting with the W. Next: raise nl04 to 8e19. put J back at 0.5MW |
| Jan 21 2010 02:14:58:887PM | 1100121023 | Steve Wolfe | Shot#23: raise nl04 to 8e19. put J back at 0.5MW plasma full length, multiple H-modes Density was still only 7.5. Didn't load the density change. Next: really raise nl04 to 8e19 |
| Jan 21 2010 02:26:22:323PM | 1100121024 | Steve Wolfe | Shot#24: really raise nl04 to 8e19. put J back at 0.5MW plasma to 0.7sec, Got 3MW mostly from D&E. Multiple H-modes, multiple injections. Next: raise nl04 to 9e19 (really) |
| Jan 21 2010 02:41:03:540PM | 1100121025 | Steve Wolfe | Shot#25: raise nl04 to 9e19 (really) No neon yet. IGT=3.1e-6 in INIT plasma full length, multiple H-modes Early runaways at 3e13 level. Multiple H-modes early (.4 to .75) and late (1.0 to 1.5sec) E port faulted out at 0.75, D and J stayed on to the end Next: try again to see if E will stay on at slightly lower power |
| Jan 21 2010 02:55:40:870PM | 1100121026 | Steve Wolfe | Shot#26: try again to see if E will stay on at slightly lower power This may be just too low a q for EDA. fizzle. late breakdown. pressure looks high. Didn't notice what it was at INIT on this one. I don't think it was much higher than previous. Next: just repeat, see if it comes back on its own |
| Jan 21 2010 03:05:29:057PM | 1100121027 | Steve Wolfe | Shot#27: just repeat, see if it comes back on its own Disrupts at 0.55sec E still not happy, on and off; when it's on get 3MW. Bounces in startup, some runaways. pressure much lower than 26. IGT was 1.7 at init. bd at 6.3msec Next: Drop Ip to 550kA, see if higher q95 helps |
| Jan 21 2010 03:20:23:040PM | 1100121028 | Steve Wolfe | Shot#28: Drop Ip to 550kA, see if higher q95 helps Set up PG2 waveform for 75msec starting at .3sec, but don't enable yet IGT=2.7e-6 at INIT (10min) plasma full length, 2 short early H-modes lost E after .5sec, under 2MW from then on. Runaways to 8e13, no bounce in startup. Next: Start RXU at -.019 instead of ramping in. |
| Jan 21 2010 03:30:57:603PM | 1100121029 | Steve Wolfe | Shot#29: Start RXU at -.019 instead of ramping in. reduce clearin to .008 between .35 and .5sec IGT=3.2e-6 at INIT Disrupts at .89sec, no runaways. RF is ratty, E trips out early. Next: turn on Neon puff, 75msec from .3sec |
| Jan 21 2010 03:46:12:713PM | 1100121030 | Steve Wolfe | Shot#30: turn on Neon puff, 75msec from .3sec RF will reduce E and increase J. Ramp Ip from 550 at .35 to 600 at .7sec, turn on Int gain=0.5 from .7sec on plasma disrupts at 0.53sec,Rf at 3MW stays on. Maybe too much neon? Prad is rising with the rf, much faster than on 29. Next: turn off neon (zero pg2 puff) |
| Jan 21 2010 03:58:53:620PM | 1100121031 | Steve Wolfe | Shot#31: turn off neon (zero pg2 puff) Disrupts at .53sec, exactly the same timing. This one has runaways. RF stays on, short H-mode presence or absence of neon has no effect I can see on this. Next: Try ramping the RF from 1MW at .35 to 3MW at 1.0sec Drop nl04 request to 7.5e19 |
| Jan 21 2010 04:16:23:400PM | 1100121032 | Steve Wolfe | Shot#32: Try ramping the RF from 1MW at .35 to 3MW at 1.0sec Drop nl04 request to 7.5e19 plasma to 1.7sec, multiple H-modes, all ELM free They start at .75sec, around 2MW. Next: initial RF to 2MW, keep ramping through eof |
| Jan 21 2010 04:31:48:900PM | 1100121033 | Steve Wolfe | Shot#33: initial RF to 2MW, keep ramping through eof plasma full length, bounce in startup, some runaways. multiple H-modes starting at 0.62sec, all ELM-free RF reaches a ratty 4MW Next: RF at 2.5MW flat |
| Jan 21 2010 04:44:33:853PM | 1100121034 | Steve Wolfe | Shot#34: RF at 2.5MW flat, increase power in rampdown (SJW request) plasma full length, lots and lots of h-modes, starting at .45sec late bd but made it ok, no runaways Next: nl04 to 8.5e19 |
| Jan 21 2010 04:50:45:853PM | 1100121035 | Steve Wolfe | Shot#35: nl04 to 8.5e19 IGT=3.3e-6 in INIT plasma to 1.2sec, multiple H-modes, E faults out at 1.1sec, D has a few faults after that. J ok at 1MW. Next: raise nl04 to 1e20 |
| Jan 21 2010 05:07:38:167PM | 1100121036 | Steve Wolfe | Shot#36: nl04 to 1e20 plasma full length, lots of ELM-free H-modes 2.5MW steady from D&J (1fault from D), then up to 5MW ratty in rampdown H-modes are rapid, then sort of peters out toward the end of the shot. Bd was back to more normal time, but runaways early END of RUN |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:03:33:370AM | Plasma | Ok | |
| 2 | 09:16:40:713AM | Plasma | Ok | |
| 3 | 09:29:38:400AM | Plasma | Ok | |
| 4 | 09:42:34:933AM | Plasma | Ok | |
| 5 | 09:55:41:900AM | Plasma | Ok | |
| 6 | 10:09:17:823AM | Plasma | Ok | |
| 7 | 10:28:25:277AM | Plasma | Ok | |
| 8 | 10:41:20:450AM | Plasma | Ok | |
| 9 | 10:54:13:323AM | Plasma | Ok | |
| 10 | 11:07:14:277AM | Plasma | Ok | |
| 11 | 11:20:09:027AM | Plasma | Ok | |
| 12 | 11:35:51:807AM | Plasma | Ok | |
| 13 | 11:48:45:870AM | Plasma | Ok | |
| 14 | 12:05:43:493PM | Plasma | Ok | |
| 15 | 12:18:44:933PM | Plasma | Ok | |
| 16 | 12:33:31:370PM | Plasma | Ok | |
| 17 | 12:48:06:387PM | Plasma | Ok | |
| 18 | 01:01:13:650PM | Plasma | Ok | |
| 19 | 01:16:07:040PM | Plasma | Ok | |
| 20 | 01:29:00:150PM | Plasma | Ok | |
| 21 | 01:41:52:760PM | Plasma | Ok | |
| 22 | 01:54:41:447PM | Plasma | Ok | |
| 23 | 02:07:34:290PM | Plasma | Ok | |
| 24 | 02:20:29:463PM | Plasma | Ok | |
| 25 | 02:32:59:010PM | Plasma | Ok | |
| 26 | 02:45:51:540PM | Plasma | Ok | |
| 27 | 02:58:46:680PM | Plasma | Ok | |
| 28 | 03:11:42:120PM | Plasma | Ok | |
| 29 | 03:24:27:637PM | Plasma | Ok | |
| 30 | 03:37:16:480PM | Plasma | Ok | |
| 31 | 03:50:01:527PM | Plasma | Ok | |
| 32 | 04:02:37:103PM | Plasma | Ok | |
| 33 | 04:18:13:137PM | Plasma | Ok | |
| 34 | 04:30:39:197PM | Plasma | Ok | |
| 35 | 04:43:29:620PM | Plasma | Ok | |
| 36 | 04:57:00:400PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Jan 21 2010 09:03:08:747AM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||