| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Steve Wukitch |
| Physics operator(s): | Jim Irby,Steve Wolfe |
| Engineering operator(s): | Andy Pfeiffer,Bill Byford,Ed Fitzgerald |
| Engineering Operator Run Comment |
| automatically entered by signon - please replace with real comment |
| Session Leader Plans |
| Entered: Feb 18 2010 01:03:03:967PM |
| Author: Steve Wukitch |
| Run Plan
Start with a discharge similar to 1100211008. 1. nl_04~0.5, Ip~1.2 MA, -90deg phasing, scan 3He fraction (50, 100, 150 ms puff) and two RF power (3 MW and 5 MW) steps per discharge. (3 discharges) - include shots with modulation 2. Repeat with heating phase (3 discharges) - include shots with modulation 3. Repeat with Ip~0.9 MA, nl_04~0.5, -90deg and heating phase. (2 discharges) 4. Repeat with nl_04~1, Ip~1.2 MA, -90deg phasing scan 3He. (3 discharges) - include shots with modulation use Ar to seed in low density discharges use N2 to seed high density and H-mode attempts Attempt H-mode discharges starting from step 4 with SSEP = -0.4- -0.3 cm. 1. Scan 3He fraction (50, 100, 150 ms puff). (3 discharges) - include shots with modulation 2. If unsteady H-mode lower plasma current to 0.9 MA. 3. If unsteady H-mode, raise target nl_04~1.2. 4. If performance is poor, start USN sweep down to LSN |
| Physics Operators Plans |
| Entered: Feb 18 2010 04:49:57:527PM |
| Author: Steve Wolfe |
Physics Operator Plan for Friday, Feb 19, 2010
MP#508a D(He3) Minority heating
SL: Wukitch
PO: wolfe
This will be an 8T run. All pre-op checks, including TF fuse checking,
should be carried out accordingly (see notes by Cochran).
*NOTE: Alternator should run at 1716 rpm*
Cryopump required starting from first shot.
Run to begin at 09:00 and end at 17:00
Overnight ECDC Parameters:
---------------------------
gas and pressure: D2 at 2e-4 Torr
sweep: 44/45/103 cm
scan: 20/120 s
----------------------------
Engineering setup as on 1100211016:
Note -- TF start at -1.5sec, invert at 1.2sec
TF current limit=235kA
Alternator should run at 1716 rpm for this run.
Minimum time in RECOOL shall be 20 minutes after each high-field shot
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)
fill B-side upper with 15psi He3; Hybrid Enabled (PG2)
fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3)
Fill H-bottom with 10psi N2 Hybrid DISABLED (PG5)
fill NINJA with 10 psi D2 DISABLED
--------------------------------------------------------
Enable gatevalves and shutters: ECE, VUV, HiREX Sr, Z-bolo, B-spectrometer
Other settings and requirements:
--------------------------------
Torvac gatevalve toggle (yes/no):No
Boronization(yes/no): no
Overnight ECDC (yes/no): YES
ICRF(yes/no): Yes (all four transmitters)
LH(yes/no): no
Cryopump (yes/no): YES Starting with first shot.
Vessel temperature: 35/35/35
*************************************************
Physop plan:
------------
SL wants to start from something close to 1100211008 (nl04=.5e20,Ip=1.2MA
Bt=8.0) with He3 puff=50msec, two RF steps @3MW and 5MW, Jphase=-90deg.
Start from 1100211016 (seg1 and seg2) with the following changes:
Seg1:Change IC_EF1U & L from -5770 to -5750; also points at
[.073,.101] from -4000 to -3850 (aiming to improve
vert. stab in startup.
IC_EF4U from -1280 to -1285A (compensate for extra 20A on EF1's)
TF_Current from -221000 to -224000. Leave this in seg1 even if
we go down later.
Drop Pg4 from 60ms to 54msec for first shot, raise as needed
Seg2: IC_EF4U target from 2000 to 2500 (alleviate ef2l demand a little)
TF_current from -221000 to -224000 (assuming SL wants 8.0 not 7.9T)
Ramp TF down starting at 1.2sec
Verify PG2 puff at 50msec
Consider reducing Ar puffs (PG1) after first shot
Take first shot as above. Consider moving divert time earlier by 150 to 200ms
for later shots, to try to reduce early Mo. Maybe adjust current rise
(Ip gains before .5sec). Otherwise, SL plan is to take half a dozen shots
at these settings with different He3 puffs and RF phase.
For step 3 of run plan, drop Ip from 1.2 to 0.9MA
For step 4 of run plan, back to 1.2MA, raise nl04 from .5 to 1e20
For step 5, go to lower null, small SSEP, high strike point, looking
for H-modes, preferably EDA (have we ever done that at 8T). Possible
target to modify is 1091022002, change Ip to 1.2MA, raise TF, remove
late zcur ramp (or not). Import this into segment 3.
Seg3: Ip from 1.0 to 1.2MA
TF_CURRENT from -150000 to -224000, rampdown at 1.2sec
PG2 puff from .2 to .25sec
I have all of these changes saved as 1100219000 on alcdata-test::/cmod/trees/test/pcs and ../dpcs so I can load them for tomorrow.
I will probably be in late on Friday, and Jim Irby will sub for me as
physop until I arrive.
|
| Session Leader Summaries |
| Entered: Feb 19 2010 04:57:21:330PM |
| Author: Steve Wukitch |
| This run, in combination with 1100210 and 1100211, provide a
reasonable scan of He concentration and density for characterization of He3 minority heating regimes. The low He puff rates gave poorer heating performance than 150 ms puff. Increasing the density to nl04~1 also reduced the heating but the radiation was significantly lowered. Increasing the target density with the same He puff resulted in similar He concentration as the lower density discharges. The heating efficiency (neutron rate and central temperature) appeared sensitive to power level and antenna phase. Overall heating effectiveness appeared better at low density. We tried a couple of H-mode discharges to investigate the response in the PCI. |
| Physics Operator Summaries |
| Entered: Feb 19 2010 06:32:06:877PM |
| Author: Steve Wolfe |
Physop Summary for Friday, Feb 19, 2010
MP#508a D(He3) Minority and MC heating (8T)
SL: Wukitch
PO: Irby, wolfe
EO: Pfeiffer, Byford, Fitzgerald
The run got off to a rocky start when the charging supply for the
EF1L comm bank failed and had to be replaced. This tested ok (shot#1)
Then on the shot#2, the first plasma attempt, we got a fizzle which was
eventually traced to a problem with the OH2L power supply. The problem
was that the supply voltage signal, which is used for the internal
feedback to the DPCS demand, was reading low, only about half of the
actual output voltage as measured on the bus (after switch close and
before commutation). This has happened before, apparently most recently
on 1090819014, with fix verified the following day on test 1090820002.
The symptom was that the OH2L current was more negative than usual by
~1kA, and the BR_0 was off by about 2mT. The DPCS feedback was trying
to correct the BR_0 by commanding less negative voltage, but the
current remained too negative. The diagnosis is complicated by the fact
that the supply voltage as seen on the COMPARE_VOLTS_DPCS scope seemed
to be following the DPCS demand as it should. However, the actual voltage
on the bus was much more negative, consistent with the observed current.
Today the engineers (Gary and Andy, with Bill Cochran consulting by phone)
reseated the master control board and power cycled everything, and a re-run
(shot#3) of the PLC 10kA test shot 1090820002 confirmed that the bus and supply
voltage readings were again in agreement. The next plasma attempt (Shot#4)
was successful and the OH2L problem did not recur today.
Shot#4 ran through at 8.0T, but the SCR junction temp fault (Type 2) did
fire just before EOF at 1.2sec, and the breakers came out at the end of
the shot. The spurious IOC indications we had seen last week again
occurred after 4sec, with no current in the magnet. We then backed off
the field to 7.9T (-221kA) and the Junction Temp fault did not recur. We
really do seem to be right up to the edge at these field settings.
There were no further technical problems with power systems the rest of
the day. After shot#11 the TF resistance had gotten up to 1.9mOhm and
we increased the cooldown time to 25 minutes, which kept the resistance
below 1.8mOhms.
We managed to get through a decent fraction of the run plan, with the
SL choosing to skip and consolidate steps. We scanned the He3 puff from
50ms to 150ms and did -90 and dipole phase (J-port) at 1.2MA,7.9T,0.5e19/m^2.
Best heating seemed to be at 150ms puff, not too much difference with
J phase. All shots had D and E also operating, except for some faulting.
The RF waveforms typically had two or three power steps, up to ~5MW.
Mo levels were high again, with very high Zeff apparently almost all due to Mo.
Te0 values weren't quite as high as on 1100211, but close. Neutron rates
were up to 1e14/sec or so, and we got another Neutron Alert. Over half
the shots disrupted either in flattop or in early rampdown. I eventually
managed to improve the rampdown, which had some vertical stability
problems, but injections continued to be a problem. Early discharges
e.g. #4 and 8, had runaways in the rampdown, apparently seeded during the
high temperature phase. Adding some density in rampdown, and starting
rampdown while the RF was still on seemed to eliminate this. On shot#6 I
moved the divert time a little earlier, but this didn't make any
obvious improvement on the Mo influx, so I didn't pursue it further.
We also did a couple of higher nl04 cases (1e20/m^2), which had less
Mo and less radiation, but also lower temperature and neutrons. We never
tried the lower current case with upper null, and did not increase
the Argon puff to try seeding. JR reported that the second argon puff
was not visible on the low density shots (not burned out, but apparently
screened).
By shot#16 the SL was ready to try LSN and attempt to get H-modes. This was
successful, achieving 3 or 4 ELM-free H-modes at 1.2MA, 8e19/m^2. On #17
we tried to access EDA at 1MA, 1e20/m^2, and also tried putting in
N2 seeding through the lower divertor with H-bottom valve, since the
thermocouples on tiles 4 and 5 were showing > 100C delta-T on#16.
However, the H-bottom valve chopper board once again started opening at the
beginning of pulse with zero demand, bringing the pressure up to 0.9mTorr
and resulting in a dud. This problem has been "fixed" twice now, and I think
we need to punt on the H-bottom chopper. I can produce the desired modulation
in software, either by using the modulate_wv feature on the V-waveform
directly or by the DPCS loadable procedure DPCS_PIEZO_CHOPPER, with somewhat
compromised linearity but considerably better reliability, I think.
Anyhow, after the dud on 17, we turned off H-bottom and put 10psi of N2
in B-side Lower in place of the Argon. This worked insofar as it did not
cause a disruption (100V pulse from .6 to 1.15sec), and Matt did see the
N in the plasma, although it was not clear that the divertor heat load
or the Mo level was reduced. Still, the shot ran full length, with
three rather so-so ELM-free (not EDA) H-modes. Nevertheless, two LSN plasmas
both had some sort of H-mode, which is not bad compared to previous experience
at 8T.
There were two fizzles (shots#6,7) aside from the one caused by the power supply problem on shot#2. These followed a full current disruption, but
also had the PG3 puff in seg1 moved to -30msec, in a test to see if this
would help suppress runaways. The pg3 was moved back to +20msec on shot#8,
and the pg4 puff lowered, and successful startups were restored. On
subsequent disruptions I lowered the PG4 by 10% with good success.
Scorecard:
Tests: 2
Duds 1 (H-bottom fault)
Fizzles 3 (one OH2L problem)
Plasmas 12 (one early disruption, 3 flattop disruptions)
======== ==
Shots 18
|
| Session Leader Comments | |||
| Feb 19 2010 09:01:13:650AM | 1100219001 | Steve Wukitch | EF1 power test |
| Feb 19 2010 09:12:58:413AM | 1100219002 | Steve Wukitch | fizzle |
| Feb 19 2010 10:28:01:453AM | 1100219003 | Steve Wukitch | OH2L test |
| Feb 19 2010 10:54:37:627AM | 1100219004 | Steve Wukitch | plasma
3He ~ 50 ms puff starts at 0.2 s noise pickup in bolometry suggests single pass is low rotation swings co-current when J turns off lost J antenna due to FMIT#4 anode current overload - power supply is too small! next: reduce TF to 7.9 T to avoid junction temperature limit in TF supply lower J power to avoid overload degas antennas |
| Feb 19 2010 11:18:24:527AM | 1100219005 | Steve Wukitch | plasma - early disruption
3He ~ 50 ms puff starts at 0.2 s, phase is -90 density increase with RF is less next: increase 3He puff to 100 ms, move divert earlier |
| Feb 19 2010 11:31:07:543AM | 1100219006 | Steve Wukitch | fizzle |
| Feb 19 2010 11:49:47:737AM | 1100219007 | Steve Wukitch | fizzle |
| Feb 19 2010 12:24:19:057PM | 1100219008 | Steve Wukitch | plasma - heating is better than 50 ms He3 puff
He3~100 ms puff definite transition to small ST next: 150 ms He puff |
| Feb 19 2010 01:00:30:140PM | 1100219009 | Steve Wukitch | plasma - neutron rate is best thus far
He3 ~ 150 ms missed GPC next: repeat with GPC |
| Feb 19 2010 01:25:11:133PM | 1100219010 | Steve Wukitch | plasma - neutron rate is best thus far
He3 ~ 150 ms bit of faulting in the RF at high power next: change to heating phase |
| Feb 19 2010 01:54:32:980PM | 1100219011 | Steve Wukitch | plasma
heating phase, 150 ms He3 puff D antenna was ratty next: retune D and retry |
| Feb 19 2010 02:24:55:810PM | 1100219012 | Steve Wukitch | plasma - disruption
good heating, heating phase, longer sawteeth next: raise nl04~1 from nl04~0.5 |
| Feb 19 2010 02:43:55:160PM | 1100219013 | Steve Wukitch | plasma
nl04 ~ 1 (about 2x previous density) stored energy, neuts are down 3He puff ~ 150ms - gave nearly same concentration as low density?! next: change phase -90deg |
| Feb 19 2010 03:01:28:133PM | 1100219014 | Steve Wukitch | early disruption - no rf |
| Feb 19 2010 03:38:58:553PM | 1100219015 | Steve Wukitch | plasma
J4 anode current overload heating is still poor 3He puff ~ 150 ms next: LSN discharge based on 1091022002 (small, negative SSEP), Ip ~ 1.2 MA, BT~7.9 T, nl04~0.8 |
| Feb 19 2010 04:13:55:873PM | 1100219016 | Steve Wukitch | plasma - LSN
3He puff ~150 ms H-modes - ratty RF trips in H-mode strike point got hot next: raise nl04~1, Ip down to 1 MA, N seeding through H bottom 10 psi starting at 0.6 s - promote less ELM free and lower strike point delta T |
| Feb 19 2010 04:25:02:073PM | 1100219017 | Steve Wukitch | dud |
| Feb 19 2010 05:00:49:647PM | 1100219018 | Steve Wukitch | Plasma
H-modes next: end of run |
| Physics Operator Comments | |||
| Feb 19 2010 08:31:23:617AM | Jim Irby | Signed in as PO until Steve arrives
Andy is replacing Spellman supply for EF1 cap bank. It would not turn on this morning. We will start out with a cycle test to make sure the bank charges properly. | |
| Feb 18 2010 06:01:20:593PM | 1100219001 | Steve Wolfe | Loaded from previously saved setup 1100219000 (see PO_PLAN for details). Load at 18-Feb-2010 18:00:47.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Should be ready to run. |
| Feb 19 2010 08:59:31:993AM | 1100219001 | Jim Irby | changes --------------------------------
Cycle test to check out the EF1 commutation bank power supply results -------------------------------- bank looks good got some gas |
| Feb 19 2010 09:18:07:730AM | 1100219002 | Steve Wolfe | Shot#2: Shot setup from last night still loaded (8T, 1.2MA, 5e19) Charging supply fixed and ready. Result: fizzle, Br_0 very negative, -.0025T OH2L is very negative. BR_0 error is about the same. Something is not following command. Both oh2's are somewhat negative, both around 27kA. |
| Feb 19 2010 10:28:37:300AM | 1100219003 | Steve Wolfe | Shot#3: It looks like on shot#2 we had a return of a pathology that may have happened on 1090819014, namely OH2L supply voltage reads low compared to bus voltage, and supply voltage level agrees with dpcs demand. Bill Cochran remembers pulling out master control board and checking solder joints. On 1090820002 a PLC test on OH2L was done and confirmed that the bus and supply voltage agreed. For shot#3 we will repeat that test, after reseating the board and power cycling the supply. PLC oh2 test, 10kA. On the old test shot we were seeing between 10-20V during the flattop. Need to be careful of baseline offset. Bus voltage and supply voltage agree on this test. It's tough to tell in flattop, but since we did not commutate the inversion voltage is there, and they agree at around -190V Next: try for plasma again. |
| Feb 19 2010 10:54:58:860AM | 1100219004 | Steve Wolfe | Shot#4: Another try for 8T, 1.2MA, 5e19, hopefully with power supply working again. plasma to 1.6sec, but TF breakers pulled out after shot. Just ticked the junction temp fault, IOC's came up at end of shot. J faulted around .95sec Lots of density off the antennas, hardly any main puff during shot. No runaways. Early zcur position shows no thrashing. Good startup small vert thrash at .2sec, could be shifted RX? gain from last week? Divert time is still .4sec; leave for now. Next: Drop TF back from 8.0 to 7.9T |
| Feb 19 2010 11:09:46:657AM | 1100219005 | Steve Wolfe | Shot#5: Drop TF back from -124000 to -121000 (seg2) Load at 19-Feb-2010 10:45:58.00 plasma to 1.1sec, runaways early. breakers stayed in, but we didn't go to 1.2sec Next: move pg3 puff in seg1 to -30msec, BR_0 to +.0003 He3 puff from 50 to 100msec |
| Feb 19 2010 11:46:03:120AM | 1100219006 | Steve Wolfe | Shot#6: move pg3 puff in seg1 to -30msec (drag the whole thing over) BR_0 to +.0003 He3 puff from 50 to 100msec Move CLEARIN timing earlier by 100msec Move zxl ramp earlier by 100msec Load at 19-Feb-2010 11:16:42.00 fizzle. pressure was a little higher, just over .08mTorr; not sure if it was the pg3 or the preceding disruption. I see no response on ratiomatic before bd, I don't think it's the pg3. BR_0 did come up as expected; apparent zcur is high, +.04m, but not much thrashing. BD time ok (.0059s). Z-meter doesn't burn out, Halpha looks ok, no real current rise. I think it was just junk from the disruption. Mass 32,28,20,18,16,14 were all higher after shot#5 than earlier today. Next: No change, just wait it out. |
| Feb 19 2010 12:07:47:460PM | 1100219007 | Steve Wolfe | Shot#7: No change from #6. Relative to #5: move pg3 puff in seg1 to -30msec (drag the whole thing over) BR_0 to +.0003 He3 puff from 50 to 100msec Move CLEARIN timing earlier by 100msec (try for earlier divert) Move zxl ramp earlier by 100msec RGA traces spike during cryo cooldown, then drop; M32 got over 1.5e-7 then came back down during INIT. Wasn't doing that on earlier shots. Result: another fizzle. OK, undo the pg3 move and drop pg4 Zmeter never burns out, no current rise to speak of. Zcur still looks high, drop BR_0 back as well Got a warning of no finite signal on f13, but it looks fine?? Bob agrees, don't understand the warning. |
| Feb 19 2010 12:38:18:480PM | 1100219008 | Steve Wolfe | Shot#8: Move pg3 puff back to +.02sec, PG4 from 54 to 50msec BR_0 from .0003 to 0 Relative to #5: He3 puff from 50 to 100msec Move CLEARIN timing earlier by 100msec (try for earlier divert) Move zxl ramp earlier by 100msec Load at 19-Feb-2010 11:55:54.00 Gettting another excursion on M32,28,14 during cryo cooldown. Is this a cryo leak issue or a red herring? It's smaller this time than on 7. Result: plasma to 1.55sec, some runaways, but not bad. Good heating, neuts/hards to 7e13; as on #4 we see hards in rampdown. GPC2_te0 touches 8keV, less density rise during RF, but still some. Startup is not so nice, CIII rises until 26ms, then falls and rises again. Current turns around, then recovers. Diverts at .34sec, not as early as I expected. There is a glowing tile on the inner floor in front of J, visible on wide2 One TF fuse tested bad, have to change an hipot SCR before next shot Next: 150ms on He3 |
| Feb 19 2010 12:58:21:937PM | 1100219009 | Steve Wolfe | Shot#9: 150ms on He3, no startup changes leave nl04 up until 1.5sec, start Ip rampdown at 1.2sec Load at 19-Feb-2010 12:34:55.00 Result: plasma to 1.4sec, almost lost it at 30msec, small runaway level early, seem to have gotten rid of the rampdown runaways RF ramps down after 1.2sec, ECE gatevalve permissive had tripped. Neuts over 1e14 Next: repeat with ECE |
| Feb 19 2010 01:18:16:797PM | 1100219010 | Steve Wolfe | Shot#10: repeat with ECE No startup changes, although startup on 9 was terrible. plasma, some early runaway although the startup looks better Neuts, similar, maybe higher. Disrupts at 1.35sec, need to do something about that, if I can. Looks like it's getting vertical problems ECE is fine this time. Next: RF changing phase, no change in He3 program. |
| Feb 19 2010 01:46:53:453PM | 1100219011 | Steve Wolfe | Shot#11: RF changing phase, no change in He3 program. Start CLEARIN,RCUR,ZCUR ramps at 1.2sec Load at 19-Feb-2010 13:22:58.00 plasma full length, halpha spike at .69sec, just into RF No runaways. Neuts~1e14 (Catherine has already issued the alert) D a little choppy, otherwise RF is ok I guess. TF resistance is at 1.9mOhm, rising a little on each of the last three shots. RECOOL time extended to 25minutes for next shot Next: Repeat with D working (hopefully) |
| Feb 19 2010 02:08:00:277PM | 1100219012 | Steve Wolfe | Shot#12:Repeat with D working (hopefully) No DPCS changes. plasma to 1.1sec, disrupts during RF. Injection Some runaways early, not terrible. Next: Raise nl04 from .5 to 1e20 |
| Feb 19 2010 02:39:25:420PM | 1100219013 | Steve Wolfe | Shot#13: Raise nl04 from .5 to 1e20. PG4 from 50 to 45msec (post-disruption) plasma full length, early runaways, neuts down by factor 2, ~5e13 GPC2 now says 5keV, AEH has adjusted cal, so earlier shots may have changed peak Wmhd~100kJ, RF clean to 4.7MW, last step up faults. Prad much lower. late marfe in rampdown. Next: raise pg4 from 45 to 50msec, RF will change phase |
| Feb 19 2010 03:10:42:863PM | 1100219014 | Steve Wolfe | Shot#14: raise pg4 from 45 to 50msec, RF will change phase Still at 1.2MA, 1e20, 7.9T Result: early disruption 0.35sec, before RF. Some early runaways, startup looked ok, no bounce, xrays come up near first injection at 0.08sec Early Prad very high, 2pi foil got to 3MW at .08sec, big injections bite out of Ip at 80msec, recovers, gets hit again at .32s. MLR reports early Mo. Next: drop pg4 after disruption, await instructions |
| Feb 19 2010 03:34:27:843PM | 1100219015 | Steve Wolfe | Shot#15: pg4 from 50 to 45msec, Try again Still at 1.2MA, 1.0e20, 7.9T plasma full length, no runaways, rf seems to have faulted at some point. Neuts peak out at 3e13 at ~0.9sec. He monitor. Next: Go to lower null (seg3), nl04=0.8, He3 puff 150, TF_CURRENT to -221000 |
| Feb 19 2010 04:04:21:287PM | 1100219016 | Steve Wolfe | Shot#16: Go to lower null (seg3) baed on 1091022002, set nl04=0.8, He3 puff 150, TF_CURRENT to -221000. Ar at 50msec, SL thinks we're going to get H-mode Leave startup alone, if it runs away then raise gas. plasma, h-modes, disruption (in that order). Also early runaways. Neuts to ~6e13. Disrupts at 1.3sec, current still in flattop since I didn't ramp it down with the field. RF mostly stayed on, max of almost 5MW. Wmhd up to 137kJ, Prad close to 4MW. Next: Drop current, raise density, trying for EDA at 8T |
| Feb 19 2010 04:31:35:317PM | 1100219017 | Steve Wolfe | Shot#17: Drop current to 1MA, raise density to 1e20, Turn on H-bottom @50V from .60 to 1.15sec (outer div getting hot) Leave Zcur at -.015 through EOF at 1.5sec Clearin at 1.5 from +.003 to 0.00(ramping from 1.2sec) Drop pg4 from 45 to 41msec (post disruption tweak) trying for EDA at 8T Result: Dud. Dropped pg4 too much. Or not! pressure is 0.9mTorr H-bottom seems to have run away in seg1. That AFOL and or chopper board will not stay off! Next: repeat, without H-bottom. Put N2 in B-side lower. |
| Feb 19 2010 05:07:56:437PM | 1100219018 | Steve Wolfe | Shot#18: Turn off H-bottom and remove waveform Load 10psi N2 in B-side lower Change PG1 program to 100V from .6 to 1.15sec From #17, still there: Current at 1MA, density to 1e20, Zcur at -.015 through EOF at 1.5sec Clearin at 1.5 from +.003 to 0.00(ramping from 1.2sec) pg4 from 41msec to 45msec, hope the N2 has gotten pumped sufficiently. Result: plasma full length! Nice startup, small runaways (lt 1e13) Three h-modes, all elm-free. Target density only got to .88e20, not sure why; probably because I forgot to put on Integral (also Deriv) gains. Neuts peak at close to 1e14, Wmhd only around 120kJ Prad up to 4MW, max RF ~5MW. Divertor tiles still hot. Maybe needed more N2, or maybe it would have been better through the divertor. Matt confirms there was N2 in the spectra. END OF RUN. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:53:55:377AM | Test | Ok | EF! cap bank charging supply test |
| 2 | 09:08:23:893AM | Plasma | Ok | |
| 3 | 10:20:49:010AM | Test | Ok | OH2L forward bridge 10KA test |
| 4 | 10:34:49:087AM | Plasma | Ok | TF junction temp fault |
| 5 | 11:01:20:757AM | Plasma | Ok | |
| 6 | 11:24:21:910AM | Plasma | Ok | |
| 7 | 11:47:20:013AM | Plasma | Ok | |
| 8 | 12:10:00:870PM | Plasma | Ok | |
| 9 | 12:45:38:177PM | Plasma | Ok | |
| 10 | 01:08:45:353PM | Plasma | Ok | |
| 11 | 01:33:05:360PM | Plasma | Ok | |
| 12 | 02:02:01:330PM | Plasma | Ok | |
| 13 | 02:30:11:630PM | Plasma | Ok | |
| 14 | 02:58:32:943PM | Plasma | Ok | |
| 15 | 03:26:32:633PM | Plasma | Ok | |
| 16 | 03:54:37:430PM | Plasma | Ok | |
| 17 | 04:22:39:370PM | Plasma | Ok | |
| 18 | 04:51:22:510PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Feb 19 2010 08:53:21:047AM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||