| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Matt Reinke |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Bill Parkin,Sam Pierson,Ed Fitzgerald |
| Engineering Operator Run Comment |
| MP534 Foil/AXUV Bolo Calib in Helium |
| Session Leader Plans |
| Entered: Jul 23 2009 02:23:14:183PM |
| Author: Matt Reinke |
| ***NOT FINAL***
Run Plan for MP 534 - Foil/AXUV Bolometer Calibration in Helium ECDC in He the night before (standard configuration) Setup gas bottles to allow for N2 (2 psi) and Xe puffing from B_SIDE_LOWER. Will start with N2 puffing later in the day. Eventually switch to Xe using a 5:1 He:Xe mixture at 2 psi. 1) Start out with trying He breakdown. Try for 3-4 shots or until Wolfe is convinced it is or is not working. 2) LSN density scan matching 1090721 plasmas. RF can use 1.2-1.5 for RF conditioning. Repeat 1090721011 (nl04=0.6), 016 (nl04=0.8), 018 (nl04=1.0) and repeat 1090721018 with nl04=1.2 3) Switch to 1.0 MA, nl04=1.0 USN like 1080411017. Run ICRF from 0.5-1.5 seconds working up to 4 MW if possible. Once ICRF steady at 3 MW start adding N2 gas puff. Begin with 75 ms pulse at 0.75 seconds and adjust as necessary (~5 shots). Move to Xe puffing with 75 ms pulse at 0.4 seconds and adjust as necessary (~5 shots). |
| Physics Operators Plans |
| Entered: Jul 23 2009 06:03:53:810PM |
| Author: Steve Wolfe |
| Physop Plan and Engineering setup for Friday, July 24, 2009
MP#534: Foil/AXUV Bolometer Calibration in Helium with piggybacking of MP#559 (He threshold) and MP#355 (ICRF conditioning) SL: Reinke PO: wolfe ----------------- Engineering Setup ----------------- NOTICE: Overnight ECDC in HELIUM, Non-standard gas setup. Run begins at 09:00 and ends at 17:00 Power systems as on: 1090721011 Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid Enabled Gas setup: ***** NOTE NON-STANDARD SETUP ****** Fill B-Top with 6 psi He Hybrid enabled (PG4) fill B-side lower with 2 psi N2 Hybrid DISABLED (PG1) pump out B-side upper Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi He Hybrid enabled (PG3) pump out H-bottom, Hybrid DISABLED (PG5) leave NINJA as is and DISABLED Enable gatevalves and shutters: ECE, VUV, 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): no Vessel temperature: 35/35/35 ------------------------------ ECDC Parameters (if requested) ------------------------------ gas and pressure: He at 5e-5 Torr sweep: 44/45/103 cm scan: 20/120 s ============================================ Physop plan: ------------ Load from 1090721011 (LSN) Import 1080411017 (USN seg4) into seg 4 and update predictors 1. Start trying to breakdown in Helium. Adjust pg4 to get breakdown, early pg3 and bz rate to get current rise. Take no more than 4 duds plus fizzles before punting and going back to D2 breakdown. RF can use 1.2-1.5sec interval for tuneup and conditioning, if we get that far. 2. LSN density scan (.6, .8, 1.0, 1.2e20) as on 1090721 (but in helium). ICRF can use 1.2-1.5sec for tuneup, conditioning, and outgassing 3. Switch to seg4, USN, 1MA, 1e20 like 1080411017. ICRF waveform per SL plan. No impurity puffing until RF has steady 3MW. This may take the whole day, considering difficulties during MP#355 days Wednesday and Thursday. 4. Add N2 puff from B-side lower (pg1). Start with 75ms@0.75sec and adjust to taste (Matt's taste). 5. Change to 5:1 He:Xe mix in b-side lower (2psi). Begin with 75ms@0.4sec, adjust per SL instructions. |
| Session Leader Summaries |
| Entered: Jul 24 2009 05:24:58:647PM |
| Author: Matt Reinke |
| The day started out well but we ended up fighting the RF and then couldn't make
plasmas for a while in the afternoon. Never got anything done in (3) but got good data for (2). Breakdown in He (1) seemed to work fine in the beginning of the day but after repeated fizzle/duds in the afternoon we switched back to D2 startup. Shots 001-009 were LSN plasmas repeating shots from 1090721 at nl04=0.6,0.8 and 1.0. We skipped 1.2 due to a nasty MARFE that we were fighting. I got good data for the new LEDGE-LY and the WB4-LY showing significant signal reductions in He plasmas proving that measurements are of Lyman-a and not scattered light. Divertor AXUV radiation was up over x2 due to the main-ion switch. I'll need a closer look at the DIV/LEDGE foils. Shots 010-033 were in search of data for (3) but we never got anything all that useful. Spent a good deal of time trying to condition the RF but wasn't getting anything steady. D and E weren't able to overlap their pulses so RF power was limited. By 016 the RF noise on the foils was becoming problematic despite being small most of the day. Eventually tried to puff N2 into Ohmic but was hit with fizzles, a stuck B-SIDE-LOW and a disruption. |
| Physics Operator Summaries |
| Entered: Jul 24 2009 06:17:30:193PM |
| Author: Steve Wolfe |
Physics Operator Summary for Friday, July 24, 2009
MP#534 Foil/AXUV Bolometer Calibration in Helium
SL: M. Reinke
PO: wolfe
EO: Pierson, Fitzgerald
Not much of the main run plan was accomplished, although we
did get the ohmic LSN part pretty much completed, except
for the highest density case.
Breakdown and startup in Helium was moderately successful,
but was not as robust in disruption recovery as D2 startup.
On the positive side, the helium startup seemed to be essentially
immune to runaways, unlike the D2 to which we returned for the last
hour of the day.
The main problem for the run plan was that the RF was unable to
provide the requested power. Overlapping D and E at over 1MW each
seemed to be problematic. This had not been tried previously
because of restrictions on the power to the lower divertor. In
retrospect it may have been a good idea to do the RF conditioning
in upper null. The J-port problems from yesterday were only
partly resolved today, and no useful power from J-port was delivered
to the plasma, although some shots had one or the other transmitter
successfully firing into dummy load, and the rf_net_power traces
included this power, which will mislead the unwary.
Breakdown and startup in helium was pretty straightforward, with
a successful startup on shot#1. The range of fill pressures
(as measured by width of the PG4 pulse, since the ratiomatic was
still unreadable, and uncalibrated for helium anyway) was similar
to that for D2, with a dud occurring at 16msec during the first
exploration, and successful startups at least up to 24msec. The
pg3 puff in seg1 seemed to lead to big marfes and proved unnecessary
for runaway prevention, so it ended up being zeroed out. We had no
sign of runaways (at the 10^11 level) all day as long as we ran He
in B-top. This is consistent with the JT-60 U result of Yoshino and
Seki. Contrary to their findings, the current rise seemed to be
slightly slower than we've been getting in D2, and a little more
prone to hesitations. I tweaked EF4 more negative and dropped the
RCUR offset from 2000 to 1500 to improve the positioning on the
current rise.
Fueling the helium discharges was somewhat problematic. Especially
in the upper null equilibria, it seemed to have a big lag between
even a small fueling puff and the density response, and then a
sudden uptake of the fuel and an almost step function rise in
the density. The NL04 P gain was reduced from 8 down to 2, and a
D gain of 3 applied for the whole flattop, to try to prevent
big excursions in the fueling, but I never fully eliminated the
step up in density for the 9e19 target. Lower density was fairly
flat with minimal fueling in flattop.
The Dalpha diode seemed to be passing some continuum light, or
maybe a non-hydrogenic line, since the levels in startup never
went below ~0.2 of the D2 peak level, but we think that the
D fraction was much lower than that. It also went to saturation
during marfes but Earl reported insufficient signal to resolve
H/D except at the end of a few shots, and their was almost no
neutron signal during RF, although the dalpha did rise a little
during the rf at higher powers (~2MW or so).
The oh2l coax resistance started going up early in the day, and
reached values above 3uOhm despite the fact that almost all shots
were going full length and double swinging to around 20kA. I
extended the fizzle gate to 2.1sec and the OH invert times to 2.3sec,
and the TF flattop to 2sec, in an effort to increase the restoring
force on the rocker. Eventually the resistance started back down,
and even went below 2uOhm.
Unforunately, we then started to get fizzles following a disruption
and the resistance went back up to the alarm level above 2.5uOhm,
though not approaching 3 again.
On shot#22 we had a 1MA flattop disruption from which we were unable
to recover with helium pre-puff. After six non-plasmas (some of
which were no-power shots and power supply duds not associated
with the startup) we changed B-top back to 6psi of D2, and immediately
got a plasma into rampdown, albeit dominated by runaways. We then
got one more full length plasma, still with some runways, a fizzle which,
unlike any of the helium cases had too fast a current rise and
bounced a couple of times outside before dying, and a short disruption
probably caused by an injection.
Only one plasma with nitrogen injection was produced, #30, and that
was ohmic and had too little N2 puff (75ms) to affect the bolos. The last
two unsuccessful attempts would have had 250ms of N2, but didn't
get that far. Therefore no useful bolo calibration today.
Scorecard:
No power: 1
Duds : 3 (one due to power system fault)
fizzles : 7
plasmas : 21 (18 into rampdown, 2 early disruptions, 1 flattop disruption)
======== ==
Shots 32
|
| Session Leader Comments | |||
| Jul 24 2009 09:09:42:530AM | 1090724001 | Matt Reinke | Repeating 1090721011, nl04=0.6. Density came out a little high and there's early D-alpha light so we'll want to repeat.
Indications look good that it's mostly helium during the flattop. MID/WB4-LY are near zero. The LEDGE-LY is down by almost x10 from the D2 plasma which is good and expected, but the LEDGE-AX is up x3 with a much wider brightness profile. |
| Jul 24 2009 09:21:33:607AM | 1090724002 | Matt Reinke | No early D-alpha on this one. Still running density a bit higher than programed, 0.7 rather then 0.6. Try once more to hit the low density point then move on. |
| Jul 24 2009 09:48:14:840AM | 1090724004 | Matt Reinke | Density down to 0.6 on this shot. Good match for the 1090721011 shot.
NEXT: Move on to nl04=0.8 |
| Jul 24 2009 10:01:08:560AM | 1090724005 | Matt Reinke | Density wonky early, looks like fueling from a deuterium source it found (inner wall?). Repeat once. |
| Jul 24 2009 10:15:10:420AM | 1090724006 | Matt Reinke | Good shot for comparison (minus the MARFE). Some heating concerns from JT on the divertor. Iron still present but absolute level lower. Leave RF off for the remainder of the LSN shots.
NEXT: nl04=1.0 |
| Jul 24 2009 10:34:32:687AM | 1090724007 | Matt Reinke | Still have a nasty MARFE problem. Iron went away with RF. JT still worried about the boron tile, seeing some hot spots on the boron tiles on the J-ANT view. Not seeing any boron "flares" in the plasma looking at the CXRS.
NEXT: repeat. PREVIEW: skip nl04 1.2 data point and go to portion (3) of the run plan. Will need copious amounts of RF. |
| Jul 24 2009 11:04:16:013AM | 1090724009 | Matt Reinke | Steve managed to slay the MARFE! Skipping the 1.2 shot to avoid further MARFE problems.
NEXT: Move to the USN shot. Have RF from 0.9-1.2 (1 MW-D) 1.2-1.5 (1 MW-E). |
| Jul 24 2009 12:20:13:873PM | 1090724010 | Matt Reinke | USN, nl04 a little over target. RF ran well, but no IR to verify tiles. Iron and moly still present, but down ~1/3 from 002 when RF was at 1 MW total. Keeping the RF starting late due to density ramp. Limiter thermo's see 20-25 degree rise, highest on AB-LOW. Divertor sees nothing, which is expected.
NEXT: Repeat with Steve tweaking density rise. RF still separated but demand up to 1.25 MW. |
| Jul 24 2009 11:52:26:670AM | 1090724012 | Matt Reinke | Having density control problems, but during the RF it's a nice shot. The H-alpha trace is not seen on the VUV H-alpha, but is seen on the INV_PLTFRM_4 chord. Fe and Mo still ok during RF.
Still have B tiles heating up during the shot, but it doesn't seem tied to the RF. Keep looking at that. NEXT: Stack the RF pulses from 0.9-1.5. |
| Jul 24 2009 12:20:21:620PM | 1090724014 | Matt Reinke | Good density flattop but it doesn't seem to be controlled by gas puffing. RF trippy. Edge radiation source comes up after 0.5. Looking at CXRS it's not boron...possible fluorine? IR still shows the boron hot spots but nothing flying off. GH_LIM camera does not show any hot spots.
NEXT: Repeat, move the RF start back to 0.75 |
| Jul 24 2009 12:32:10:577PM | 1090724015 | Matt Reinke | Uncontrolled density rise again. Steve says there's some E/D cross-talk that's messing with the ICRF. Continue with this for a few shots to see if we can deplete the fuel source. If not try a limited shot w/ ICRF?
NEXT: Repeat |
| Jul 24 2009 12:45:11:153PM | 1090724016 | Matt Reinke | Same as 015
NEXT: Repeat |
| Jul 24 2009 01:04:26:480PM | 1090724017 | Matt Reinke | Still having density and RF problems. The CHROMEX (INV_PLTFRM_4) and the CXRS see significant oxygen in the plasma. Possibly the edge radiator in the bolometry?
NEXT: We welcome the J-ANT into the fight |
| Jul 24 2009 01:34:02:980PM | 1090724019 | Matt Reinke | Density starts dropping after 1.2 seconds and the gas puff even comes back on before rampdown. PRAD flare after 0.9 is seen on the HIREXJR Mo trace as well as the B and O traces in the CXRS. RF still having problems.
NEXT: Continue |
| Jul 24 2009 02:23:50:543PM | 1090724021 | Matt Reinke | Gas feedback turning on even earlier (1.15 sec). Noise starting to creep back up on the bolometry. Still not getting two ANT to overlap. |
| Jul 24 2009 02:42:59:107PM | 1090724022 | Matt Reinke | Lower density demand for this shot reached. RF outgassing observed but E/D still cannot overlap. J still being debugged. |
| Jul 24 2009 04:33:10:677PM | 1090724029 | Matt Reinke | Changing back to D2 startup did the trick, although full of runaways and K-LIM took a 45 degree deltaT. Getting too much RF interference on foil arrays to be useful for cross-calibrations. Puff N2 into Ohmic phase.
NEXT: Move RF to 1.2-1.5 seconds and do impurity puffing into Ohmic. 2 psi N2 at 0.6 for 75 ms. |
| Jul 24 2009 04:46:55:020PM | 1090724030 | Matt Reinke | Got requested target plasma but no indication of N2 injected. B-Side-Lower MKS doesn't shot a change during the Piezo pulse.
NEXT: Increase to 250 ms |
| Physics Operator Comments | |||
| Jul 24 2009 07:30:37:780AM | Steve Wolfe |
Setting up for today's He run.
Load from 1090721011
Import seg4 from 1080411017: 1.0MA, Upper Null
Recalc seg4 predictors#1-8
Build_seg - no warnings
Bring up all_p's: upper null programming looks reasonable, rxu=-.02,zxu=.01
Bring up v1-16: Notice feedforward on pg3, no pg1 puff
Bring up v17-32: Ack change of name on #19. remove negative
waveform on #19. Remove sawtooth on amhd_freq. Notice no test
waveform on wire 20. (all cosmetic changes)
Check seg2, LSN waveform from Brian's run, nl04=6e19
Bring up V1-16:
PG4=22msec, PG3 at 100 through 50ms, down to ~70 through 85ms
There is some indication that I may want lower pressure in He,
based on a cursory reading of Yoshino&Seki's results on JT-60U
(PPCF 39 (1997),205) but they mainly report assisted startup
with LH, and compare to H2. I'll drop pg4 to 20msec for now.
Other seg1 settings:
RCUR=2000
BR_0=0.0005
IC_EF4U=-1275
Leave these alone.
Load at 24-Jul-2009 07:27:51.00
Open tree /home/wolfe/pcs_scratch -1
Open tree done
| |
| Jul 24 2009 07:34:27:293AM | Steve Wolfe | There seems to be something a little flakey with the logbook today. First attempt at entering the previous entry did not take. Also, there seems to be no record of my physop sign-in, although the cmod_runs page sees me as signed in. Maybe a jabber server needs to be running for sign-ins to show up? | |
| Jul 24 2009 08:04:38:840AM | Steve Wolfe | Notice that Matt is actually calling for the ohmic density scan to match Brian's shots, and there were gap changes between shot#11 and some of the others, in addition to the density scan. #16 (nl04=0.8e20) has a 1mm change in rcur (.656->.657 on the fifth point) and #18 matches #16. This was for probe targeting, but it's easy enough to make the change when he wants to go to 0.8e20. Just have to remember it! Ian's PCS_compare program is useful for this sort of checking. | |
| Jul 24 2009 08:17:52:483AM | Steve Wolfe | Examining the original 1080411017 programming (seg4) I notice that the oh feedforward voltages are rising in time, with oh1 getting to 184V by 1.714sec; this is in contrast to a normal D2 programming which typically has falling V_OH1 to ~125V by that time (initial points after current ramp are ~150V. This was presumably some compensation for higher Zeff, but I didn't notice any comment in the Physop summary for 1080411, so it may have been inherited from earlier experiments. May need to watch this. | |
| Jul 24 2009 09:07:31:577AM | 1090724001 | Steve Wolfe | Shot#1: First attempt with helium breakdown, seg2 LSN 6e19, 800kA plasma full length! I guess it was helium. Some hesitation in current rise, Dalpha has no spike, Sig<0.2 He I signal on \spectroscopy::top.vis_signals:mcp_vis_sig3 up to 0.5 (units?), rather slow increase in brightness compared to usual Dalpha similar on Zeff. Breakdown time normal ~6ms Density is high early, flattops at 7.7e19 instead of 6e19. Only one small burst of seg2 puffing from pg3 between .5 and .7, and the seg1 is probably too big, although the dalpha indicates we're probably getting gas (D2) off the wall during the limiter phase. NL04 drops going through eof. Next: decrease pg4 by 2msec decrease pg3 in seg1, stretch nl04 program to eof instead of dropping at 1.3sec |
| Jul 24 2009 09:22:48:137AM | 1090724002 | Steve Wolfe | Shot#2: pg4 from 20 to 18msec, pg3 in seg1 to 50V max stretch nl04 program 6e19 to 1.5sec instead of dropping at 1.3sec plasma full length. Still a little early dalpha, but marfe is gone. We're seeing a burst of dalpha light in late rampdown, after 1.8sec, still getting a little more nl04 than we want, ~7e19. Check feedforward, we still get a little puff early. Hesitation in startup is worse, actually almost went inside this time. Normally I would reduce pg4 again, but intuition may be wrong, since 18ms looks worse than 20. Seeing very little increase in dalpha during ICRF. JR is reporting a large amount of Fe in this plasma Next: pg4 from 18 to 16, see if it gets better or worse. Note that JT is going to turn down the HeI gain to keep from saturating later in shot. |
| Jul 24 2009 09:30:28:683AM | 1090724003 | Steve Wolfe | Shot#3: pg4 from 18 to 16, pg3 down some more in seg1 NL04 D gain extended through eof. This one may fizzle, in which case I'll put pg4 back up Dud. Ok, it doesn't look like it likes the low pressure. This is about where I'd expect to lose D2 as well, Next; pg4 to 22msec |
| Jul 24 2009 09:46:55:467AM | 1090724004 | Steve Wolfe | Shot#4: pg4 to from 16 to 22msec plasma full length; got it back ok. Nice current rise this time OH2L resistance went up to 3uOhm after the dud. Density is still running a little high. Getting a density increase early (while limited), and some prad as well. RF is up to 1.5MW, and can see a little dalpha rise then. The background dalpha in startup is pretty constant shot-to-shot around 0.2. Next: kill the pg3 in seg1, since we see no sign of runaways. Move to 8e19 case, adjust rcur point. |
| Jul 24 2009 09:57:49:200AM | 1090724005 | Steve Wolfe | Shot#5: kill the pg3 in seg1, since we see no sign of runaways. Move to 8e19 case, adjust rcur point at 1.5sec to .657 from .656 plasma full length, getting a dalpha marfe from .3 to .45 or so. OH2L is still up at 2.9uOhm; not good. Small hesitation in startup. Next: Move fizzle off time to 2.1sec, extend TF flattop, try to force coax foot to move more. |
| Jul 24 2009 10:13:09:497AM | 1090724006 | Steve Wolfe | Shot#6:Move fizzle off time to 2.1sec, extend TF flattop to 2.0, try to increase restoring force on coax foot Move clearin out earlier to relieve marfe (from -.01@.238 to -.001@.28) OH2L is getting to pretty high reverse swing already though, so this may not help. plasma full length, still marfing. Diverts earlier, but it's still asking for gas until .35sec, need to reduce early program nl04 or reduce gain until after .5sec. OH2L back to 3.1uOhm, No sign that it drops any at the end. Of course, I forgot to move the invert times. Do that next. Next: decrease nl04 gain before 0.5sec |
| Jul 24 2009 10:31:14:937AM | 1090724007 | Steve Wolfe | Shot#7: decrease nl04 gain before 0.5sec to 4 raise nl04 program to 1.0e20. RF off for this shot. OH invert times from 2.0 to 2.3sec, so they see the fizzle swing, but they're already above the level, so it isn't likely to matter. plasma disrupts at 1.8sec in rampdown. Huge marfe on dalpha this time. It's inner wall marfe after it diverts. Fuels like crazy. EF1U is on it's current rail at the end.Out of v-sec Looks like oh2l resistance came down a little at the end of the shot, but the dissipation is up to 2.5kJ during the pulse. Also, bp11_jk has 11mT offset, not used for control. Next: try increasing clearin to get rid of marfe? |
| Jul 24 2009 10:47:48:200AM | 1090724008 | Steve Wolfe | Shot#8: slow down program density rise clearin from -.001 to 0 dud. Why? BR_0 perhaps a little worse Didn't need that! Next: raise pg4 I guess |
| Jul 24 2009 10:57:41:670AM | 1090724009 | Steve Wolfe | Shot#9: pg4 from 22 to 24msec, ef4 from -1275 to -1290, leave BR_0 alone. plasma to 1,75sec, some hesitation in startup. Got rid of the marfe. OH2L resistance to 2.9uOhm this time. Next: moving to upper null portion (skip 1.2e20 point). |
| Jul 24 2009 11:12:34:870AM | 1090724010 | Steve Wolfe | Shot#10: moving to upper null portion of run plan. Seg2 off seg 4 on, Get rid of pg3 in seg4 Forgot to extend TF pulse, will do for next one. plasma full length, marfe around crossover density overshoots. bad hesitation in startup this time; which way should I go on the fill???? RF fired at .9, around 1MW. No neuts. Next: decrease density ramp before .3 sec |
| Jul 24 2009 11:30:32:247AM | 1090724011 | Steve Wolfe | Shot#11: decrease density ramp before .3 sec, delay 9e19 from .5 to .6sec clearin at -.00052 to +.001 flattop value is .0025 from .414sec on) rcur offset from 2000 to 1500 in seg1 Extend TF pulse to 2.0 sec nl04 gain before 0.5sec from 8 to 4, D gain at 3 to 1.5sec (was off) fizzle, moves in. It looks like too much gas. next:PG4 back to 22msec |
| Jul 24 2009 11:57:36:840AM | 1090724013 | Steve Wolfe | Shot#13: RF will raise power, I'll lower the P gain on nl4 to 4 all the way through, speed up the program just a little Fizzle. Previous startup looked great, this one looks like it moves in; RCUR predictor shows it inside, so not much point in reducing the offset again. Next: EF4 more negative by 15A |
| Jul 24 2009 12:11:58:450PM | 1090724014 | Steve Wolfe | Shot#14: IC_EF4U from -1290 to -1305. Hope it doesn't screw the b.d. Changes since 12: RF will raise power, I'll lower the P gain on nl4 to 4 all the way through, speed up the program just a little plasma full length, Density still takes a step and comes out too high, up around 1.1. I can drop the gain again, the problem seems to be the response is slow, so the lag is killing us, then it never comes out. Next: reduce nl04 gain again, take 1ms off pg4. |
| Jul 24 2009 12:28:42:373PM | 1090724015 | Steve Wolfe | Shot#15: reduce nl04 to 2 before 0.5sec, 6 after pg4 from 22 to 21msec. plasma to 1.8sec, still getting a big step at 0.5sec, responds to gain switch. Just drop it to 2 all the way across, and put in a little puff at 0.45 |
| Jul 24 2009 12:38:55:637PM | 1090724016 | Steve Wolfe | Shot#16: drop nl04 P gain to 2 all the way across, and put in a 60V pg3 puff at 0.45 to .50 plasma to 1.9, still have a density rise at 0.5sec, responding to the puff. Next: increase Ip ramp to 1MA, increase NL04 ramp |
| Jul 24 2009 01:03:53:513PM | 1090724017 | Steve Wolfe | Shot#17: increase Ip ramp to 1MA, increase NL04 ramp remove pg3 puff in seg4 plasma full length, density still has the step at 0.5 with no step in gain or puff. Very little fueling between 0.26 and 0.68sec Ip didn't come up much faster, gain switch isn't till .64sec, don't push it. Next: no changes, see how repeatable it is when I don't change anything |
| Jul 24 2009 01:25:04:280PM | 1090724018 | Steve Wolfe | Shot#18: no changes, J may fire this time plasma full length density looks about the same. J3 came on, but faulted out early, no J4?? D is ragged, and faults shortly after E turns on. E hanging in pretty well. OH2L coax is back down below 2uOhm. Cooling is taking longer than normal because of the extended TF pulse length, but I'm not going to bring it back as long as the coax is going the right way! Next: repeat |
| Jul 24 2009 01:32:03:060PM | 1090724019 | Steve Wolfe | Shot#19: repeat plasma full length, density still has a step, but comes down a little during pulse. This time D stays on and E trips out. No J. Looks like their PLC problem is not as fixed as we thought. Next: Keep banging away |
| Jul 24 2009 01:47:02:217PM | 1090724020 | Steve Wolfe | Shot#20: repeat plasma disrupts at .5sec, pf breaker pulled Lots and lots of magnetics errors. probably the crowbar. OH2L crowbarred before the disruption, causing it. Access to check fuses. |
| Jul 24 2009 02:21:42:293PM | 1090724021 | Steve Wolfe | Shot#21: repeat, hopefully without the crowbar and disruption I'd adjust the gas following the disruption if I knew which way to go. plasma full length, and I guess the answer is not to go either way, although there was a hesitation and it moves way in before catching it. Density behavior is the same OH coax warning is about OH2U this time, but OH2l also went up. Not much the f.d. can do on a crowbar. Might come back down next time, although the upper seems to go back up at the end of the shot. Next: I'm tempted to put the nl04 target up while it's limited, see if it takes the gas then, but that may bring back the marfe. |
| Jul 24 2009 02:38:12:577PM | 1090724022 | Steve Wolfe | Shot#22: Try putting an early nl04 point up to 8e19 (t=0.2sec) Instead, try just asking for 5e19, since RF says it will be better for them anyway. plasma disrupts at 1.4sec, looks like an injection probably from rf antenna. Got D up to 1.6MW, no E, J3 put 600kW into dummy load (would be nice if it didn't show up on the net power trace). Startup looked better this time. Density ok, very small fueling and gets about to target, then a little over during the RF. Next: either repeat, or change something. |
| Jul 24 2009 02:51:36:170PM | 1090724023 | Steve Wolfe | Shot#23: Probably should have dropped pg4 after the disruption, but I didn't. RF trying to get E to stay on (and keep D). J still debugging into dummy load. fizzle. Like I said, should have dropped pg4. Had a lot of CIII and apparent Halpha, not much HeII., Next: drop pg4 by 1msec |
| Jul 24 2009 03:06:08:060PM | 1090724023 | Steve Wolfe | Shot#24:drop pg4 from 21 to 20msec Stuck in init, sounds like something is rebooting in the computer racks. Tom is checking |
| Jul 24 2009 03:23:24:467PM | 1090724024 | Steve Wolfe | Shot#25:drop pg4 from 21 to 20msec data hang possibly cleared, but now rf has a computer problem. Yijun trying a test shot. |
| Jul 24 2009 03:35:40:920PM | 1090724025 | Steve Wolfe | Shot#25:drop pg4 from 21 to 20msec RF computer power cycled, try again. Dud? Fields look wrong. OH1 did not commutate. |
| Jul 24 2009 03:49:11:013PM | 1090724026 | Steve Wolfe | Shot#26: pg4 still at 20msec, try again, with oh1 comm enabled this time. fizzle. Still moving in, still CIII and Halpha. fields don't look bad. Maybe it wants more gas. Next: back to 22msec |
| Jul 24 2009 04:03:38:260PM | 1090724027 | Steve Wolfe | Shot#27: pg4 to 22msec, don't know why that would do better, but have to try something and going down didn't help. Fizzle. Hardly any difference, maybe a little worse. OH2L coax resistance coming back up. RGA looks ok, fields look ok. current rise is too slow. Next: drop pg4 to 18msec, if that fizzles or duds go to D2 |
| Jul 24 2009 04:15:47:480PM | 1090724028 | Steve Wolfe | Shot#28:drop pg4 to 18msec, if that fizzles or duds go to D2 fizzle. Go to 6psi D2 in B-top. No change in startup, still moving in, still has high CIII. At least I can see if D2 is any better, or it's just too much dirt to run after the disruption on 22. |
| Jul 24 2009 04:28:27:397PM | 1090724029 | Steve Wolfe | Shot#29:Go to 6psi D2 in B-top. At least I can see if D2 is any better, or it's just too much dirt to run after the disruption on 22. No PCS changes. It will probably runaway if it goes with no pg3 puff, but I don't know how much to use in He. plasma with humumgous runaways, as predicted. disrupts in rampdown at 1.7sec Neuts/hards saturates. Conclusion: D2 is better for disruption recovery than He. Now if we can get rid of the runaways. And Matt wants to do something different. |
| Jul 24 2009 04:41:20:287PM | 1090724030 | Steve Wolfe | Shot#30: nl04 to 0.8e20 Enable pg1 at 0.6sec for 75msec, N2 pg3 in seg 1 to 80V after 20msec pg4 from 18 to 20msec plasma, still had runaways, not quite as bad. ran full length. Next: more pg4, more N2 |
| Jul 24 2009 04:54:03:880PM | 1090724031 | Steve Wolfe | Shot#31: pg4 from 20 to 22msec, more PG3 in seg1 pg1 in seg4 from 75msec to 250msec fizzle! multiple bounces. Current rise much too fast Next: pg4 to 25msec, rcur offset back to 2000 |
| Jul 24 2009 05:23:32:990PM | 1090724032 | Steve Wolfe | Shot#32: pg4 from 22 to 25msec, RCUR offset frm 1500 to 2000 pg1 in seg4 from 75msec to 250msec Maybe the five o'clock fizzle came early, and this one will run. Into INIT at 17:01 Early disruption breaker pulled, OH1 crowbar is after disruption. It's just out of crossover at 0.32sec when the disruption happens. Still had runaways, but they dumped at 0.1sec. Halpha shows an injection, not seen on xrays or AXUV 2pi bolo at 0.310, before the disruption. Not obvious why it disrupted other than this. Doesn't seem to go vertically, power supplies are all behaving, doesn't seem to be touching anything unusual, still limited. END OF RUN |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:57:02:920AM | Plasma | Ok | |
| 2 | 09:11:51:780AM | Plasma | Ok | |
| 3 | 09:26:18:263AM | Plasma | Ok | |
| 4 | 09:39:00:247AM | Plasma | Ok | |
| 5 | 09:51:33:747AM | Plasma | Ok | |
| 6 | 10:04:25:137AM | Plasma | Ok | |
| 7 | 10:17:22:920AM | Plasma | Ok | |
| 8 | 10:40:19:997AM | Plasma | Ok | |
| 9 | 10:53:02:747AM | Plasma | Ok | |
| 10 | 11:06:00:357AM | Plasma | Ok | |
| 11 | 11:25:55:997AM | Plasma | Ok | |
| 12 | 11:38:33:153AM | Plasma | Ok | |
| 13 | 11:51:20:497AM | Plasma | Ok | |
| 14 | 12:04:14:357PM | Plasma | Ok | |
| 15 | 12:22:15:043PM | Plasma | Ok | |
| 16 | 12:35:01:873PM | Plasma | Ok | |
| 17 | 12:51:50:090PM | Plasma | Ok | |
| 18 | 01:07:22:483PM | Plasma | Ok | |
| 19 | 01:26:26:170PM | Plasma | Ok | |
| 20 | 01:41:08:137PM | Plasma | Ok | OH2l Comm Fault |
| 21 | 02:14:20:170PM | Plasma | Ok | |
| 22 | 02:29:15:090PM | Plasma | Ok | |
| 23 | 02:47:46:043PM | Plasma | Ok | |
| 24 | 03:06:13:700PM | Plasma | Bad | Criticle failure during Init, no power shot |
| 25 | 03:30:08:420PM | Plasma | Bad | |
| 26 | 03:42:51:810PM | Plasma | Ok | |
| 27 | 03:55:32:763PM | Plasma | Ok | |
| 28 | 04:11:04:497PM | Plasma | Ok | |
| 29 | 04:23:41:957PM | Plasma | Ok | |
| 30 | 04:36:12:253PM | Plasma | Ok | |
| 31 | 04:48:45:473PM | Plasma | Ok | |
| 32 | 05:02:04:460PM | Plasma | Bad | OH2 commutation failure |
| System Availability | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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