| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Adrianus Sips |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Bill Parkin,Sam Pierson,Bill Byford |
| Engineering Operator Run Comment |
| Develop current rise scenario (Ohmic): Author: Adrianus Sips Author: St |
| Session Leader Plans |
| Entered: Jan 31 2008 12:39:16:707PM |
| Author: Adrianus Sips |
|
STEP 1: 9-11 shots Develop current rise scenario (Ohmic): Repeat reference shot at lower density, Ip waveform, shape control with earlier divert. (a), #2: Repeat discharge 1080108024, with modest changes: Reduce density rise after 100ms, by reducing the ne-waveform to 7e19 @ 400ms. Question: clamp Ip at 1.2 or ramp to 1.35MA as reference? With no heating during the flat top phase li may become too high for this plasma shape (vertical stability). (b), #2-3: Tune up Ip waveform: Ip demand @ 100ms to 500kA, aim for control from 70-80ms onwards, linear ramp (wihtout pause) to 1.2MA @0.42s. Leave shaping waveform as #1080108024, but try to improve on the gains. (c), #3-4: Adjust shape control to move X-point formation forward from 330ms (#1080108024), to 200ms-250ms. Keep plasma full bore before X-point formation. (d), #2: Scan Ip ramp rate, pivot point @100ms, reaching 1.2MA @500ms (slower) and 350ms(faster) STEP 2: 3-5 shots (e), #1-2 Choose stable discharge from sequence above. Run at lowest density possible, by having no gas input after 100ms (during the rise phase) (f), #2-3 Choose stable discharge from sequence above. Run at twice the density (reaching 1.4e20 @400ms). Go to 1e20 to get an intermediate point. STEP 3: 4-5 shots (g), #2 Repeat Ip rise at 7e19 or 1e20 (choose what seems best). Add 1.5MW ICRH from 200-250 ms onwards (continuing into the flat top). (h), #2 Repeat Ip rise at 7e19 or 1e20 (choose what seems best). Add 3.0MW ICRH from 200-250 ms onwards continuing into the flat top). (i), #1 Adjust Ip ramp rate for 3.0MW case when H-mode is formed (likely needing a slower Ip ramp) --> DECIDE: Step 4a (j) or Step 4b (k) STEP 4a: 5 shots to make an ITER demonstration discharge. (j), #5: Develop the optimum combination of Ip ramp rate, density and heating to demonstrate a stable discharge with li(3)=0.7-1.0, aiming for li(3)=0.85 throughout the rise pahse STEP 4b: 5 shots to document main limitations for achieving ITER goals (k), #5: Document the limitations that prevent achieving li(3)=0.7-1.0. Document what is a stable li(3) for the current rise in C-Mod. |
| Physics Operators Plans |
| Entered: Jan 31 2008 05:11:15:723PM |
| Author: Steve Wolfe |
| -----------------
Engineering Setup ----------------- Run begins at 09:00 and ends at 17:00 Power systems as on: 1080108024 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 DISABLED (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill NINJA with 10 psi D2 DISABLED Enable gatevalves and shutters: ECE, VUV, DNB, Z-bolo Torvac gatevalve toggle (yes/no): yes (3 minutes) Boronization(yes/no): no Overnight ECDC (yes/no): yes ICRF(yes/no): yes (required at step 3) LH(yes/no): no DNB(yes/no): Cryopump (yes/no): no Vessel temperature: 35/35/35 ------------------------------ ECDC Parameters (if requested) ------------------------------ gas and pressure: D2 at 2e-4 Torr sweep: 44/45/103 cm scan: 20/120 s Physop plan ------------ Pretty much covered under SL_PLAN. Load entire shot from 1080108024 Tweak seg1: pg4 from 36 to 22msec (no cryopump, no DNB) Adjust to taste, avoiding runaways and fizzles (as best I can). Step1: a) reduce pg3 puff in seg1 and lower nl04 demand in seg2 from 1.1e20 to 0.7e19 @0.4sec, leave Ip flattop at 1.35MA, maybe rampdown earlier. b) reduce Ip at .1sec to 500kA, ramp to 1.2MA at .42 (linear) copy Ip waveform to seg1, turn on seg1 Ip gain at 0.08sec Tweak gains on Ip, clearin(?), rcur. c) try for earlier diversion: push gain on clearin, xpoint waveforms Aim for XPF at .2 to .25sec; consider crowbar at .125sec, don't forget to move Voltage step. Watch out for OH force from EF1L:OH2L:OH1 ! Move seg1 rcur program to stay full bore in ramp-up. Maybe let it ride outboard limiter ? d) Vary Ip time to 1.2MA: 0.5sec and 0.35sec Step 2: e) pick a good case from step 1 and run it at lower density- reduce gas in seg1, reduce nl04 program in seg2. Watch out for locked modes! f) increase density to 1.4e20 at 0.4sec if possible, watch marfes Take intermediate point 1.0e20 Step 3: g) pick a denstity and repeat with ICRF 1.5MW from 0.2sec on through flattop h) Raise rf to 3MW i) SL_PLAN says adjust Ip down ramp for H-mode Step 4A (success): Continue Ip ramp up to 1.35MA (q95~3.4) aiming for li(3)~0.85 Step 4B (document limitations) |
| Session Leader Summaries |
| Entered: Feb 1 2008 06:17:22:140PM |
| Author: Adrianus Sips |
| What did we do today?
Ramped all dicharges to 1.35MA/5.4T 1. Repeat reference shot (#1080108024) at lower density: #001. 2. Tuned the Ip control, allowing variations in Ip ramp rates: #002-#004. 3. Tried to optimise the plasma position control, divert early: #005-#009. Here #006,#007 and #009 dirsuption at the end of the current rise, leaving as with the changes implemented in #005. 4. Ip ramp rate in Ohmic plasmas: #010 (std), #011 (slow, but earlier divert), #012 fast (disrupts). 5. Density scan, Ohmic: Low density for Std Ip ramp rate #014, #016 and low density for slow Ip ramp rate (#018). High density prepared, no plasma #017. 6. RF power input: 1.5MW, #019, #020 (increased density). 3MW: #021, #022. These 4 pulses were done at the std Ip ramp rate (cf #010). 7. Ip ramp rate with heating: Slow ramp rate, 3MW (#023, compared to #022), ever increasing ramp rates after divertor configuration (0.22s) done for #024 (3MW), #026 (3MW). And increasing ramp rate at 2WM ICRH from #027 to #031. Most of the MP plan was done. Need to have a look the data. Plasma inductance did not move a lot (apart from Ip rise rate) despite the different variations performed . The limiter phase shows variation in the li, which need to be understood in terms of plasma density, initial Ip rise rate, Te and Zeff. Should have done: - The higher density case in first 250ms. - Repeat one of these pulses in a Boronised machine. |
| Physics Operator Summaries |
| Entered: Feb 1 2008 06:29:22:187PM |
| Author: Steve Wolfe |
physics operator summary for Friday, 1-Feb-2008
MP#524 Development of ITER relevant current rise phase
SL: Sips
PO: wolfe
EO: Parkin, Pierson, Byford
A difficult run, but we covered most of the conditions in
the run plan. Unfortunately, none of these efforts made a
substantial improvement in the maximum li during the current rise
compared to our starting case of 1080108024.
We eventually did manage to get early diversion, at around .23sec,
but this did not really help the li. We did learn that, despite earlier
worries, the force on OH2L due to higher EF1 current did not increase
above the starting level of 200kN. The EF1 crowbar was moved from
.2 to .17. We did not try moving it earlier, but there is proabably
room to do so in this rampup if we want to without excess forces on
the stack. All the cases with the XPF at .23sec went limited again
briefly during OH1 crossover, typically ~.3 to .4sec on all these
shots. Programming larger gaps to avoid this was unsuccessful, but
it may be that more agressive efforts would work. The ITER-like startup
is rather fat, as is the final equilibrium, but we seemed to have
some margin on n/ncrit at the crossover time, before we get to full
elongation or current. Note that for the earliest divertor cases,
the XPF came with Ip ge 700kA.
An interesting case with low initial li (before XPF) is shot 7, which
however disrupted before flattop. The only intentional change between
the previous shot, which had a locked mode, and 7 was higher density,
0.8 vs 0.7e20 at 0.4sec. One case we did not get was a higher density example, nl04=1.4e20. However, the evidence that the density was having a significant
effect is not strong.
ICRF heating as early as .1 sec succeeded in raising the temperature, but
not in lowering li. The RF was reasonably robust during the rise phase,
with some trips at H-mode transitions.
Both the ohmic and RF cases had H-modes in the current ramp, except for
a few lower density shots which seemed to have locked modes.
Not unexpectedly, the strongest influence on li was the dI/dt. We did not
get a time to 1.2MA of about .37sec (50msec earlier than 1080108024). We
did a lot of fiddling with keeping dI/dt from dropping locally,
although the crossover was an unavoidable lag point, and we never
got around the positional thrash at that time either.
We tried reducing the current rise rate in segment 1 (t<0.1sec),
with mixed success. This may have been a mistake, and it may have
actually been better to increase it. The main point of reducing
the current at 0.1sec was to keep the dI/dt higher at later times.
Perhaps we should have delayed the oh1 crowbar until crossover, and
increased the power supply demand to extend the very fast ramp phase.
There were a lot of 1.35MA disruptions, with no obvious damage. As
the day wore on, disruption recovery became more of an issue, and
the pre-puff was reduced to ridiculous levels (7msec). There was only
one instance of two fizzles in a row, however. On the other hand,
some of the disruptions may have contributed to succeeding disruptions,
by providing new projectiles.
There was one IGOR failure (shot 30 happened twice) and one dud because
the OH's and EF1's didn't fire on the second try at shot 30. Yijun is
still having problems with the FFT computer hanging. Aside from that,
no power supply problems. No real cooling delays, partly because we
were taking so long thinking.
Scorecard:
Duds/sys fails 1 (P.S. failure)
fizzles 7
plasmas 24 (12 disruptions)
----------- ==
shots 32 (plus 1 that didn't count)
|
| Session Leader Comments | |||
| Feb 1 2008 09:07:47:737AM | 1080201001 | Adrianus Sips | Reload settings of #1080108024, 1.35MA, fast current ramp-up, diverting @330ms
(Ip for this pulse: 600kA @100ms, 1.08MA @240ms, 1.31MA @400ms, 1.35MA @550ms) Changes compared to this reference are: - Density: 7e19 @400ms, 1e20 @600ms (lower compared to #1080108024). - Cosmetic adjustment of ZCUR in Segment 01. POST PULSE: Density ~7e19, dips after X-point formation (~330ms). 3 ELM free H-modes during flat top. |
| Feb 1 2008 09:35:15:440AM | 1080201002 | Adrianus Sips | Building on #001 of today:
- Ip for this pulse: 500kA @100ms, 1.08MA @240ms, 1.31MA @400ms, 1.35MA @550ms) - Increase gain for Ip control in Segment 01. POST PULSE: Better early Ip rise, quite similar to previous pulses otherwise. |
| Feb 1 2008 09:43:37:700AM | 1080201003 | Adrianus Sips | Building on #001 of today:
- Ip for this pulse: 500kA @100ms, 1.31MA @400ms, 1.35MA @550ms) - Increase gain for Ip control in Segment 01 and segment 02 - flatter Ip rise request at the higher gain. POST PULSE: Not a nice Ip ramp, so we have to restore settings from #002. |
| Feb 1 2008 10:08:56:867AM | 1080201004 | Adrianus Sips | Building on #001 of today:
- Ip for this pulse: 500kA @100ms, 1.31MA @400ms, 1.35MA @550ms), restore settings from #002. - Staring shape control part, move RCUR out by 7mm at 100ms - Increase CLEARIN gain. POST PULSE: Good early plasma position, full bore inner wall, outer wall. Good current rise as well. |
| Feb 1 2008 10:30:24:487AM | 1080201005 | Adrianus Sips | Building on #004 of today:
- Ip for this pulse: 500kA @100ms, 1.31MA @400ms, 1.35MA @550ms) - EF1_L crowbar now at 170ms to get more shaping control - Position plasma lower until 300ms to promote diverting earlier. POST PULSE: X-point formation still around 330ms. Looking at li(3)=0.92 for first 300ms, q95 going to 3.3 |
| Feb 1 2008 05:32:45:527PM | 1080201006 | Adrianus Sips | Building on #005 of today:
- Ip for this pulse: 500kA @100ms, 1.31MA @400ms, 1.35MA @550ms) - Adjust CLEARIN waveform POST PULSE: MHD @ around 270ms, raising li, and preventing early X-point formation. Plasma close to X-point transition 200ms-250ms |
| Feb 1 2008 10:59:58:317AM | 1080201007 | Adrianus Sips | Building on #005 of today:
- Ip for this pulse: 500kA @100ms, 1.31MA @400ms, 1.35MA @550ms) - Increase density slightly POST PULSE: Disrupts @ 0.48 seconds (1.3MA) Plasma diverts at 270ms and 320ms, close to it from 220-310ms Up to where it disrupts plasma position, li(3)~0.9, etc look good |
| Feb 1 2008 11:03:48:430AM | 1080201008 | Adrianus Sips | Repeat #006,
- Drop prefill POST PULSE: Fizzle |
| Feb 1 2008 05:30:39:180PM | 1080201009 | Adrianus Sips | Repeat #006,
- Adjust prefill - Buidling on good early phase of #006, increase ZXL (X-point position higher) POST PULSE: Disrupts just after 0.5 seconds |
| Feb 1 2008 11:45:18:183AM | 1080201010 | Adrianus Sips | Go back to settings of #005
POST PULSE: Good repeat of #005. Plasma is moving out then in preventing to divert earlier than 330ms. Maybe we just have to live with this..... |
| Feb 1 2008 11:59:14:963AM | 1080201011 | Adrianus Sips | Setting #010 as reference...
- Take data for a slower Ip ramp case. Time reaching 1.2MA 150ms later. - Gain on CLEARIN adjusted to see what happens.. POST PULSE: Nice pulse, li higher at this lower ramp rate, although density is lower as it diverts at 220ms. |
| Feb 1 2008 12:14:43:873PM | 1080201012 | Adrianus Sips | Setting #010 as reference...
- Take data for a faster Ip ramp case. Time reaching 1.2MA 50ms earlier. - Keep Gain on CLEARIN adjusted... POST PULSE: Disrupts at 0.22 s, power supplies at limit? |
| Feb 1 2008 02:00:40:313PM | 1080201013 | Adrianus Sips | Setting #010 as reference...
- same ramp rate as #010 - Keep Gain on CLEARIN adjusted... POST PULSE: Disrupts at 0.45s, drop gain increase for next pulse. |
| Feb 1 2008 12:47:35:490PM | 1080201014 | Adrianus Sips | Setting #010 as reference...
- No gas after 100ms to get low density pulse POST PULSE: Locked mode disruption when density drops to 2e19 after plasma diverts. |
| Feb 1 2008 12:50:23:930PM | 1080201015 | Adrianus Sips | Setting #010 as reference...
- No gas after 100ms to get low density pulse - minimum density 3.5e19 to avoid locked mode. POST PULSE: no plasmsa |
| Feb 1 2008 05:45:08:667PM | 1080201016 | Adrianus Sips | Setting #010 as reference...
- No gas after 100ms to get low density pulse - minimum density 3.5e19 to avoid locked mode. - reduce gas in segment01 POST PULSE: Disrupts late, data taken at low ne and high Zeff (~4) So low density scan compared to #010. |
| Feb 1 2008 01:40:04:603PM | 1080201017 | Adrianus Sips | Setting #010 as reference...
- Higher density, using gas FF during X-point formation. POST PULSE: Fizzle |
| Feb 1 2008 01:56:39:997PM | 1080201018 | Adrianus Sips | As the late X-point formation of the last few pulses is not good.
Reload shot 011, which had a good early X-point formation due to the lower Ip ramp rate. Reduce strongly the initial Ip request to 350kA, hoping to avoid high li between 100ms-200ms POST PULSE: Very low density.... But li is high! So this is a low density version of #011 |
| Feb 1 2008 05:47:13:323PM | 1080201019 | Adrianus Sips | Repeat #010 at 7e19 with ICRH=1.5MW from 200ms-1.15s.
POST PULSE: Disrupts after strong density pump-out @400ms (locked mode?) RF good, li(3)~1 |
| Feb 1 2008 02:24:40:873PM | 1080201020 | Adrianus Sips | Increase the density to 1e20 during the 1.5MW ICRH phase.
POST PULSE: Good pulse. |
| Feb 1 2008 02:40:15:530PM | 1080201021 | Adrianus Sips | Increase ICRH to 3MW keeping density the same
POST PULSE: li=0.9 @ 0.5s. but RF trips at 0.4s. |
| Feb 1 2008 02:41:27:250PM | 1080201022 | Adrianus Sips | Try again for ICRH=3MW keeping density the same
POST PULSE: |
| Feb 1 2008 03:09:57:300PM | 1080201023 | Adrianus Sips | Keep ICRH=2.5MW.
BUT load settings of #011 (slower Ip ramp rate, early divert). Keep density settings from previous ICRH heated pulses. POST PULSE: Higer li, earlier divert, not too bad.... |
| Feb 1 2008 03:21:08:233PM | 1080201024 | Adrianus Sips | Use previous early divertor, but increase the Ip ramp rate after 200ms.
(faster ramp between 0.18-0.34s) Keep ICRH as #023 POST PULSE: Fizzle, no plasma |
| Feb 1 2008 03:30:05:197PM | 1080201025 | Adrianus Sips | Use previous early divertor, but increase the Ip ramp rate after 200ms.
(faster ramp between 0.18-0.50s) Keep ICRH as #023 POST PULSE: Fizzle |
| Feb 1 2008 03:57:36:400PM | 1080201026 | Adrianus Sips | Use previous early divertor, but increase the Ip ramp rate after 200ms.
(faster ramp between 0.18-0.50s) Keep ICRH as #023 POST PULSE: Good shot, li(3) drops below 1 @ 0.28, slow drop to 0.93. |
| Feb 1 2008 03:59:04:153PM | 1080201027 | Adrianus Sips | Use previous early divertor, but slight increase of Ip @ 200ms.
This discharge keep ICRH at 2MW 0.1-1.1s. POST PULSE: Fizzle |
| Feb 1 2008 04:18:47:050PM | 1080201028 | Adrianus Sips | Use previous early divertor, but slight increase of Ip @ 200ms.
This discharge keep ICRH at 2MW 0.1-1.1s. POST PULSE: Good pulse, initial li bit high, then low enough. |
| Feb 1 2008 04:34:35:867PM | 1080201029 | Adrianus Sips | Repeat #028, at lower density (7e19).
POST PULSE: Better ! li(3) down to 0.90 at end of current rise, comming down from 1.2 @200ms. |
| Feb 1 2008 04:47:53:007PM | 1080201030 | Adrianus Sips | Repeat #029
Fast Ip rise, while still early divert. POST PULSE: No plasma. Some of the supplies do not go..... |
| Feb 1 2008 05:05:03:790PM | 1080201031 | Adrianus Sips | Repeat #029
Fast Ip rise, while still early divert. 2MW ICRH, ne=7e19 POST PULSE: On the limit for early divertor formation. li(3)=0.9 at end of the current ramp |
| Feb 1 2008 05:17:40:730PM | 1080201032 | Adrianus Sips | Go for maximum current ramp rate.
This will compromise on early divert (expect now 320ms) POST PULSE: No plasma |
| Physics Operator Comments | |||
| Feb 1 2008 07:39:00:320AM | 1080131013 | Steve Wolfe |
Setup for MP#524 ITER current rise
load from 1080108024
Seg1:
pg4 from 35ms to 22ms
zcur @0.221 from -.00159 to 0. so there's no jerk at seg switch
(seg2 has zcur=0 in this shot)
Seg2:
reduce early nl04 to 0.7e20@0.4sec to prevent nl overshoot
reduce pg3 in seg2 from 50 to 20V "
flattop nl04 from 1.1 to 1.0e20 (@0.6sec, 1.35MA)
add Ip point at [0.02,-220000] in preparation for copy to seg1
Note: When we're trying to get earlier diversion (step 1c) should
try moving zcur down to xpoint, then back up to midplane as shape
evolves. This helped with Kessel's startup.
Load at 1-Feb-2008 07:38:16.00
Open tree /home/wolfe/pcs_scratch -1
Open tree done
Ready for shot#1 (unless we decide to change something)
|
| Feb 1 2008 09:08:23:970AM | 1080201001 | Steve Wolfe | Shot#1: plasma attempt, going for 1.35MA like 1080108024 plasma full length. 3 ohmic H-modes Some injections especially early According to efits, li goes below 1 at 0.085sec, and nips back over at 0.25sec, maxing at 1.05@.32sec (efit01). Density still dips at .335, when it diverts, then it bounces mm or so before finally staying diverted; crossover effect? |
| Feb 1 2008 09:30:49:310AM | 1080201002 | Steve Wolfe | Shot#2: Change ip point at 0.1 sec from 600 to 500kA, copy to seg1. Turn on Ip gain P=1.0 at 0.05sec in seg 1. plasma, full length, ohmic h-modes again Extremely similar to 1, h-mode starts earlier around .55sec diverts ~0.35sec |
| Feb 1 2008 09:43:45:543AM | 1080201003 | Steve Wolfe | Shot#3: Move Ip gain switch from [3.56,2.59] to [.2,2.59]; note step is from 1.80. Get rid of Ip point at .242, go linear from .1 to .4 Drop seg2 pg3 puff to zero. Plasma full length crossover between .32 and .35sec Ip slower before .25, not enough gain for loss of waveform point. |
| Feb 1 2008 10:02:31:657AM | 1080201004 | Steve Wolfe | Shot#4: Ip waveform to -1.1MA at .25sec; Ip gain from 2.59 to 4 at .2sec Ip gain in seg1 from 1 to 1.8 Move rcur out at 0.1sec from .64859 to .655, and match in seg2 Raise initial clearin gain from 4.91 to 7.3 plasma full length. outboard limited intermittently between 0.1 and 0.3sec |
| Feb 1 2008 10:26:03:013AM | 1080201005 | Steve Wolfe | Shot#5: Start trying for early diversion crowbar on ef1L from 0.2 to 0.17 Bring zcur from 0 down to -.005 at .1 in seg 1 then to -.01 at .2 back up to zero from .32 to .4 plasma full length, still doesn't divert earlier OH force still at 200, no higher. Forgot to move the EF1 volt step to .17sec. Crossover is between .27 and .3 |
| Feb 1 2008 10:41:33:297AM | 1080201006 | Steve Wolfe | Shot#6: remove ef1 V step at 0.2sec (leave at zero, no crowbar step) clearin from -.002 to +.005 at .258 to .4sec Leave zcur -.01 to .4sec diverts at .32, no h-mode. locked mode? 40kHz mode from .4 through flattop. Next: raise nl04 |
| Feb 1 2008 10:59:49:350AM | 1080201007 | Steve Wolfe | Shot#7: raise nl04 to .8 at .4sec, pg3 to 20 Disruption at .48sec at 1.3MA Break in slope on demand for ef1's & ef2's at .463sec looks like increased radiation, vsurf goes up. |
| Feb 1 2008 11:09:39:940AM | 1080201008 | Steve Wolfe | Shot#8: pg4 from 23 to 20ms try again. fizzle. |
| Feb 1 2008 11:30:51:603AM | 1080201009 | Steve Wolfe | Shot#9: pg4 from 20 to 18ms try again. fizzle. ZXL to .005 at .244 and .380sec Disrupted .55sec, still not solidly diverted until .32sec vertical problem Next: back to 5, without ef2 feedforward step |
| Feb 1 2008 11:44:24:227AM | 1080201010 | Steve Wolfe | Shot#10: back to 5, without ef1 feedforward step pg4 from 18 to 16 plasma, made it home alive! h-modes again. Still diverts at .36, no locked mode. |
| Feb 1 2008 11:56:47:040AM | 1080201011 | Steve Wolfe | Shot#11: Clearin integral gain from .358 to .2 Ip program slower by .15sec, flattop at 0.6sec plasma full length. Actually diverts at .215sec, goes back to wall at crossover, then stays diverted. li is over 1.05. slower current rise as programmed. |
| Feb 1 2008 12:18:09:390PM | 1080201012 | Steve Wolfe | Shot#12: Program Ip faster by 200msec (flattop at .5sec) disrupted at .23sec, something comes in at .223sec Obvious voltage jumps at clearin gain switch at .200, then steps again with the injection. OH1 voltage saturates at .2sec. It's almost on the rail before. Next: go back to 10 but add gain switch. |
| Feb 1 2008 12:25:39:027PM | 1080201013 | Steve Wolfe | Shot#13: reload seg2 from 10, change clearin integral gain switch to .2sec disrupted at .45sec, diverts at .33sec. CLEARIN gain doesn't help. Next: Put int gain back to .358sec, start density scan |
| Feb 1 2008 12:40:54:823PM | 1080201014 | Steve Wolfe | Shot#14: Put int gain back to .358sec, start density scan, program nl04 to 1e19 pg4 from 16 to 14msec disrupted at .6sec, Runaways high. Density pumps out after diversion. Locked mode at 0.4sec or so. |
| Feb 1 2008 12:49:03:820PM | 1080201015 | Steve Wolfe | Shot#15: nl04 to 3.5e19, P gain from 9 to 2 at .078 until 0.4sec P=8 fizzle. |
| Feb 1 2008 01:11:01:650PM | 1080201016 | Steve Wolfe | Shot#16: pg4 from 14 to 12msec nl04 to 3.5e19, P gain from 9 to 2 at .078 until 0.4sec P=8 Also, pg3 in seg1 from 66 to 30V Disrupts at 1sec, TCI feedback goes negative at .35 to .39sec, causing big gas puff. Irby says it has done it on earlier shots as well. Locked mode at .45sec Next: high density |
| Feb 1 2008 01:26:08:103PM | 1080201017 | Steve Wolfe | Shot#17: Program 1.4e20 at .6sec, NL04 gain off till 0.4sec, pg3 to 35V in seg 2 put puff back in seg1 (60V early) FIZZLE. Made it to 120kA, CIII signal very high, almost makes it. |
| Feb 1 2008 01:49:29:363PM | 1080201018 | Steve Wolfe | Shot#18: reload seg 1 from 14, reduce pg4 to 12msec seg2 relaod from 11 (slow current rise) and program 350kA at 0.1sec, gain=3 at .04sec, oh crowbars to .07sec nl04 gain to 1 until .4sec Runaway startup, disrupts at .47sec Still getting 450kA at 0.1sec, Ip is already 400kA at .07 when it crowbars. |
| Feb 1 2008 02:17:10:240PM | 1080201019 | Steve Wolfe | Shot#19: reload shot 10, pg4 to 14msec RF on at 0.2 to 1.15sec disrupts at .45sec RF good at 1.5MW from .2 to disruption. diverts at 0.36sec, proabable locked mode after divert. |
| Feb 1 2008 02:24:02:810PM | 1080201020 | Steve Wolfe | Shot#20: nl04 to 1.0 at 0.4sec plasma full length, h-modes diverts at 0.34sec li above 1 before diverts, lower after. rf ok until .45sec, loses in H-mode Next: repeat with more power |
| Feb 1 2008 02:36:48:120PM | 1080201021 | Steve Wolfe | Shot#21: plasma full length runaways early, rf faults at .37sec, diverts at .34sec li somewhat lower. Try again. |
| Feb 1 2008 02:48:04:853PM | 1080201022 | Steve Wolfe | Shot#22: pg4 to 15msec Try again for 3MW plasma got 3MW to .5sec next: reload 11 |
| Feb 1 2008 03:05:37:607PM | 1080201023 | Steve Wolfe | Shot#23: seg2 from 11, raise nl04 as on 22. Start rf at 0.1sec pg 4 from 15 to 18msec plasma disrupts at .8sec rf ok to .45sec, diverts at 0.23sec, li is higher |
| Feb 1 2008 03:12:38:867PM | 1080201024 | Steve Wolfe | Shot#24: ip waveform to [.18,-.66e6] (same), [.34,-1.1e6] (faster) Same rf, no seg1 change. Trying to get li down during/after XPF fizzle, should have dropped pg4 after distruption |
| Feb 1 2008 03:26:41:380PM | 1080201025 | Steve Wolfe | Shot#25: pg4 from 18 to 15ms ip waveform to [.18,-.66e6] (same), [.34,-1.1e6] (faster), and [.5,-1.31] (keep a little faster to 0.5sec Same rf, no seg1 change. Trying to get li down during/after XPF another fizzle. |
| Feb 1 2008 03:50:00:143PM | 1080201026 | Steve Wolfe | Shot#26: pg4 from 15 to 13ms ip waveform to [.18,-.66e6] (same), [.34,-1.1e6] (faster), and [.5,-1.31] (keep a little faster to 0.5sec Same rf, no seg1 change. Trying to get li down during/after XPF plasma disrupts at 0.8sec diverts at .23sec. li at .22sec is 1.08 and up again at .35sec, near crossover when it goes limited again. |
| Feb 1 2008 03:59:53:670PM | 1080201027 | Steve Wolfe | Shot#27: pg4 from 13 to 10ms Increase ip gain from .17sec from 4 to 7.0 fizzle. |
| Feb 1 2008 04:18:05:567PM | 1080201028 | Steve Wolfe | Shot#28: pg4 from 10 to 9msec Increase ip gsin from .17sec from 4 to 7.0 plasma, early runaways but full length. |
| Feb 1 2008 04:29:13:813PM | 1080201029 | Steve Wolfe | Shot#29: reduce nl04 to .7e20 before .6sec clearin from -.002 to +.003 between .258 and 0.5sec plasma disrupts at 1.1sec still goes limited at crossover, but not as long. rf looks good whole shot. li better |
| Feb 1 2008 04:37:33:527PM | 1080201030 | Steve Wolfe |
Shot#30: .18 from .66 to .7
.34 from 1.1 to 1.2
.5 to 1.35
clearin to .005 from .258 to .5, rcur out by 1mm
pg4 from 9 to 8msec post-disruption.
FFT failed in INIT, go ahead anyway.
IGOR failed no power anyway
|
| Feb 1 2008 04:48:49:430PM | 1080201030 | Steve Wolfe |
Shot#30: .18 from .66 to .7
.34 from 1.1 to 1.2
.5 to 1.35
clearin to .005 from .258 to .5, rcur out by 1mm
pg4 from 9 to 8msec post-disruption.
Some supplies didn't go. No oh's no ef1's
|
| Feb 1 2008 05:05:40:667PM | 1080201031 | Steve Wolfe |
Shot#31: Ip .18 from .66 to .7
.34 from 1.1 to 1.2
.5 to 1.35
clearin to .005 from .258 to .5, rcur out by 1mm
pg4 from 9 to 8msec post-disruption.
plasma with runaways, disrupts at 1.2sec
1.2MA at .37sec
diverts at .26, a little later, still re-limits
|
| Feb 1 2008 05:12:37:190PM | 1080201032 | Steve Wolfe | Shot#32: remove point st .18, 1.2MA at 0.3sec pg4 from 8 to 7msec rcur at 0.1 from .655 to .645 in seg1 fizzle. END OF RUN |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:57:20:283AM | Plasma | Ok | |
| 2 | 09:18:10:530AM | Plasma | Ok | |
| 3 | 09:37:54:067AM | Plasma | Ok | |
| 4 | 09:54:41:350AM | Plasma | Ok | |
| 5 | 10:14:12:873AM | Plasma | Ok | |
| 6 | 10:30:58:127AM | Plasma | Ok | |
| 7 | 10:46:45:817AM | Plasma | Ok | |
| 8 | 11:01:38:583AM | Plasma | Ok | |
| 9 | 11:14:03:770AM | Plasma | Ok | |
| 10 | 11:33:45:183AM | Plasma | Ok | |
| 11 | 11:50:16:970AM | Plasma | Ok | |
| 12 | 12:02:41:827PM | Plasma | Ok | |
| 13 | 12:20:58:100PM | Plasma | Ok | |
| 14 | 12:33:26:393PM | Plasma | Ok | |
| 15 | 12:46:48:643PM | Plasma | Ok | |
| 16 | 12:59:13:183PM | Plasma | Ok | |
| 17 | 01:22:36:473PM | Plasma | Ok | |
| 18 | 01:41:27:260PM | Plasma | Ok | |
| 19 | 02:03:11:707PM | Plasma | Ok | |
| 20 | 02:17:56:507PM | Plasma | Ok | |
| 21 | 02:30:36:020PM | Plasma | Ok | |
| 22 | 02:43:12:753PM | Plasma | Ok | |
| 23 | 02:57:36:160PM | Plasma | Ok | |
| 24 | 03:10:11:660PM | Plasma | Ok | |
| 25 | 03:22:49:003PM | Plasma | Ok | |
| 26 | 03:35:22:640PM | Plasma | Ok | |
| 27 | 03:55:58:980PM | Plasma | Ok | |
| 28 | 04:08:32:510PM | Plasma | Ok | |
| 29 | 04:21:27:553PM | Plasma | Ok | |
| 30 | 04:34:53:867PM | Plasma | Bad | OH and EF Power Supplies no go |
| 31 | 04:58:17:270PM | Plasma | Ok | |
| 32 | 05:10:49:580PM | Plasma | Ok | |
| System Availability | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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