| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Robert Granetz |
| Physics operator(s): | Ian Hutchinson |
| Engineering operator(s): | Bill Cochran,Sam Pierson,Bill Byford |
| Engineering Operator Run Comment |
| MP604 - Effect of Elongation on the Generation of Disruption Runaway |
| Session Leader Plans |
| Entered: Sep 8 2010 08:48:45:123AM |
| Author: Robert Granetz |
MP604 - Effect of Elongation on the Generation of Disruption Runaway
Electrons Using LH-driven Seed
Session leader: R. Granetz
Physics operator: I. Hutchinson
Overnight: standard ECDC and 60 C bake.
Run will start at 09:00 and end at 17:00.
Power systems as on 1100217019 (0.8 MA, limited, low elongation)
A-coil configuration: +Dtop -Dbot -Jtop +Jbot; Hybrid enabled (standard
configuration)
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)
DISABLE NINJA
Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo, HIREX-Sr, B-spectrometer GV
Torvac setup: keep gate valves open during pulse
LHCD: P_LH >= 0.7 MW, t=0.80-1.05 s; 90 deg phasing or whatever is
best for driving suprathermal electrons; ready to go on shot 1.
LBO: laser blowoff loaded with tungsten slide and focused so that enough
impurity will be injected to reliably disrupt an 0.8 MA plasma. LBO
trigger should be set for t=1.000 s. LBO should be DISABLED for the
start of the run.
Gas jet: filled with 50 bar mixture of 85% He, 15% Ar. Should be DISABLED
for the start of the run
ICRF: none
Cryopump: not needed
DNB: not needed
Necessary diagnostics:
LH hard x-ray array
WIDE1, WIDE2, and LH video cameras; GHLIM camera is desirable
Thermocouples on limiters
Divertor IR camera is desirable
Plasma current Rogowski
-------------------------------------------------------------------------------
Run plan: We want to trigger disruptions in a series of plasmas with
decreasing elongation. The goal is to determine if low-elongation,
limited plasmas have a propensity for current quenches with significant
runaway electron (RE) populations. LHCD will be used to seed the plasma
with suprathermal electrons prior to the disruption. Reproducible
disruptions will be generated by two different methods: (1) gas jet, and
(2) tungsten injection. A plateau in the plasma current decay will be
the principal signature of RE's. Hard x-ray diagnostics (HXR monitor,
HXR array, forward visible emission) will provide information on
suprathermal electrons, and limiter thermocouples (and maybe the divertor
IR camera) will diagnose energy deposited to first wall structures.
Melting of limiters is not desirable, and if this is observed, this
experiment will be modified or terminated accordingly. Kinetic profiles
before and during the disruption are desired for use with NIMROD modeling.
A relatively recent low-elongation limited discharge is 1100217019, for
which kappa=1.15. But I want to start with near-normal elongations and
step down to lower and lower elongations.
Step 1:
Load seg 1 from a recent standard non-cryopump startup.
Load seg 2 of 1100217019, but set CLEARIN to -2.5 cm to make a
barely-limited equilibrium, adjusting RCUR to get a 15 mm outboard
gap. Also keep Ip at 0.8 MA for the entire flattop, and set Btor to 5.3
T. Inject LH during t=0.8-1.05 s. (2 shots)
Repeat, adjusting outer gap and LH in order to generate a large
suprathermal population. (2 shots)
Step 2:
Trigger a disruption at t=1.00 s with the gas jet. Confirm lack of RE
current in CQ. (1 shot)
Step 3:
Trigger a disruption at t=1.00 s with LBO W injection. Confirm lack of
RE current in CQ. (1 shot)
Step 4:
Reduce CLEARIN to -4.5 cm, adjusting RCUR to keep outer gap unchanged.
Inject LH during t=0.8-1.05 s. Repeat, adjusting outer gap and LH in
order to generate a large suprathermal population (3 shots)
Step 5:
Trigger a disruption at t=1.00 s with the gas jet. Check for RE current
plateau in CQ, and limiter tile heating. If no RE plateau is observed,
repeat one time (2 shots)
If no RE plateau is observed, or tile heating is minimal and Mo production
is minimal, then
Step 6:
Trigger a disruption at t=1.00 s with LBO W injection. Check for RE
current plateau in CQ, and limiter tile heating. (1 shot)
If no RE plateau is observed, or tile heating is minimal and Mo production
is minimal, then
Step 7:
Reduce CLEARIN to -7.0 cm, adjusting RCUR to keep outer gap unchanged.
Inject LH during t=0.8-1.05 s. Repeat, adjusting outer gap and LH in
order to generate a large suprathermal population (3 shots)
Step 8:
Trigger a disruption at t=1.00 s with the gas jet. Check for RE current
plateau in CQ, and limiter tile heating. If no RE plateau is observed,
repeat one time (2 shots)
If no RE plateau is observed, or tile heating is minimal and Mo production
is minimal, then
Step 9:
Trigger a disruption at t=1.00 s with LBO W injection. Check for RE
current plateau in CQ, and limiter tile heating. (1 shot)
If we get through all of this and tile heating and Mo production is
minimal, then I would like to try a low-elongation diverted configuration.
|
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Sep 8 2010 05:50:24:047PM |
| Author: Robert Granetz |
Although decreasing the plasma elongation to 1.5, 1.3, 1.15, and finally 1.0 resulted in clear signs of LH-seeded suprathermal electrons existing in the current quench, the runaway population was not enough to effect the current quench in a significant way. We ran inboard limited plasmas all day, with LH power of 0.55-0.65 on most shots. The gas jet system worked extremely reliably, and was able to reproducibly disrupt the plasma with a 1.7 ms valve pulse of 50 bar of 85% He, 15% Ar. The gas jet shots at the lower elongations showed a clear dump of RE's at the end of the current quench. We also used laser blowoff of tungsten to disrupt some plasmas, but these didn' show any signs of RE's in the CQ. We even disrupted a single shot with a large argon puff, with results similar to the LBO W injections. So, even though we ran C-Mod with low-elongation, even circular plasmas, with LH seeding of suprathermals, and the same field and size as FT-U, we don't ever see significant runaway plateaux in the current quench. This is also unlike every other low-elongation and/or limited tokamak, including DIII-D. |
| Physics Operator Summaries |
| Entered: Sep 8 2010 05:17:22:933PM |
| Author: Ian Hutchinson |
| Summary
======= Accomplished all the plan (and a bit more). Controlled disruptions as required. Only 4 fizzles. Not bad considering most shots are deliberate disruptions. Scorecard Shot,Duration(s),Ipmax(MA),Result Shot,Duration(s),Ipmax,Result | 01 0.000 0.002 Dud | 02 1.773 0.806 Plasma | | 03 1.954 0.821 Plasma | 04 1.955 0.817 Plasma | | 05 1.957 0.816 Plasma | 06 1.007 0.846 Plasma | | 07 0.000 0.038 Fizzle | 08 1.015 0.836 Plasma | | 09 1.954 0.814 Plasma | 10 1.007 0.859 Plasma | | 11 1.007 0.847 Plasma | 12 0.000 0.039 Fizzle | | 13 1.007 0.823 Plasma | 14 1.015 0.842 Plasma | | 15 1.946 0.806 Plasma | 16 1.954 0.808 Plasma | | 17 1.007 0.880 Plasma | 18 1.007 0.879 Plasma | | 19 1.007 0.887 Plasma | 20 1.933 0.803 Plasma | | 21 0.806 0.872 Plasma | 22 0.694 0.854 Plasma | | 23 0.000 0.037 Fizzle | 24 1.007 0.651 Plasma | | 25 1.007 0.651 Plasma | 26 1.007 0.661 Plasma | | 27 1.016 0.653 Plasma | 28 0.000 0.035 Fizzle | | 29 1.019 0.652 Plasma | 30 1.007 0.858 Plasma | Date 1100908: 30 shots. 25 plasmas. 4 fizzles. 1 dud (gas cycle) |
| Session Leader Comments | |||
| Nov 2 2010 03:55:54:513PM | Robert Granetz |
Run 1100908
HXR HXR peak HXR peak HXR @CQ dump
Shot Ip kappa P_LH @1.0025 s @TQ @CQ dump /HXR @TQ
(MA) (MW) 10^14/s 10^14/s 10^14/s
------------------------------------------------------------------------------
06 0.81 1.45 0.50 0.792 1.73 0.304 0.18
10 0.80 1.29 0.57 0.306 0.43 0.024 0.06
11 0.80 1.30 0.58 1.03 1.42 1.02 0.72
13 0.80 1.30 0.57 1.08 1.96 1.86 0.95
17 0.80 1.16 0.56 2.35 4.23 0.427 0.10
18 0.80 1.16 0.57 8.23 4.67 0.206 0.04
24 0.60 1.01 0.59 4.3 4.10 4.01 0.98
25 0.60 1.02 0.61 3.3 4.65 3.10 0.67
26 0.60 1.03 0.60 3.0 3.80 5.16 1.36
30 0.80 1.31 0.70 4.5 2.03 1.22 0.60
| |
| Sep 8 2010 08:58:32:480AM | 1100908001 | Robert Granetz | Shot 01 -- No-power test of PG3 fueling valve. Looks like it opened. Next shot: go for first plasma |
| Sep 8 2010 09:13:56:667AM | 1100908002 | Robert Granetz |
Shot 02 -- Plasma, good equilibrium until t=0.4 s, and then the shot mistakenly switches from segment 2
to segment 3, which has undesired programming. Prior to t=0.4 s, the equilibrium was
just barely limited, with an elongation of 1.48 and an outer gap of 14 mm.
Next shot: repeat with seg 3 turned off
|
| Sep 8 2010 09:26:04:833AM | 1100908003 | Robert Granetz |
Shot 03 -- Plasma, full length. Exactly what we want. Inboard limited, kappa=1.47, outer gap = 10 mm.
nl_04=0.6e20 m-2
Next shot: turn on 500 kW of LH from t=0.80 to 1.05 s.
|
| Sep 8 2010 09:37:18:650AM | 1100908004 | Robert Granetz |
Shot 04 -- Plasma, full length. 0.8 MA, 5.4 T, 0.8e20 m-2, limited. P_LH=0.3 MW. There are a few
hard x-rays, but not as much as I was expecting.
Next shot: raise P_LH to 0.5 MW
|
| Sep 8 2010 10:07:23:750AM | 1100908005 | Robert Granetz |
Shot 05 -- Plasma, full length. 0.8 MA, 5.4 T, 0.8e20 m-2, inboard limited, kappa=1.47, outer gap=10 mm.
P_LH=0.5 MW, very clean. Andrea and Greg report very good signals on the central chords of
the HXR array, despite the small increase on the neuts_hards signal.
Next shot: fire the gas jet at t=1.00 s. 50 bar of 85% He, 15% Ar
|
| Sep 8 2010 10:34:56:720AM | 1100908006 | Robert Granetz |
Shot 06 -- Plasma. Gas jet disruption at t=1.005. Gas jet system worked perfectly. There were
two very clear bursts on the neuts_hards signal, the first (bigger one) at the thermal
quench, and the 2nd at the end of the current quench. The first is undoubtedly the dump
of the seed, but some RE's must remain to give the 2nd dump.
Gas jet plenum started at 51 bar and dropped to 45 bar. 85% He, 15% Ar
Next shot: Use LBO W injection at t=1.001 s to disrupt the plasma. (gas jet turned off)
|
| Sep 8 2010 10:37:08:100AM | 1100908007 | Robert Granetz | Shot 07 -- Fizzle. Next shot: try again with LBO W injection |
| Sep 8 2010 11:08:17:220AM | 1100908008 | Robert Granetz |
Shot 08 -- Plasma, disrupted at t=1.013 s by LBO W injection triggered at t=1.001 s. kappa=1.45.
The W injection causes a large increase in neuts_hards, and it takes 10 ms to cause a
thermal quench. But the large neuts_hards signal disappears at the thermal quench, and
no spikes are seen during the CQ. However, there are spikes seen on the edge x-ray array
(array_4).
Next shot: reduce elongation by reducing CLEARIN to -4.5 cm. No disruption planned. LH will be on
from t=0.80 to 1.01 s (note reduced duration, at Atma's request).
|
| Sep 8 2010 11:23:46:060AM | 1100908009 | Robert Granetz |
Shot 09 -- Plasma, full length. 0.8 MA, 5.4 T, 0.7e20 m-2, inner limited, kappa=1.29, outer
gap=11 mm. P_LH=0.55 MW. HXR array data looks good.
Next shot: repeat, but with gas jet disruption
|
| Sep 8 2010 11:50:58:783AM | 1100908010 | Robert Granetz |
Shot 10 -- Plasma, gas jet disruption at t=1.005. kappa=1.30. neuts_hards show a large dump
at the thermal quench, but only a miniscule bump at the end of the CQ. No sign of
a plateau during the CQ. But the edge soft x-ray array shows a roughly linearly
decaying signal throughout the current quench. P_LH=0.55 MW.
Andrea is doing a full analysis of this shot.
Gas jet plenum went from 53 bar to 46 bar (85% He, 15% Ar).
LH is set to fire to t=1.010 s, but is actually turning off at t=1.004 s
Next shot: repeat with gas jet injection
|
| Sep 8 2010 12:12:04:303PM | 1100908011 | Robert Granetz |
Shot 11 -- Plasma, gas jet disruption at t=1.005 s. 0.8 MA, 5.4 T, 0.7e20 m-2, inner limited,
kappa=1.30. P_LH=0.57 MW. Strong 2nd peak on neuts_hards; good signal on edge SXR,
but still no sign of any plateau in the CQ.
Next shot: repeat with the gas jet, but reduce gas jet pulse to 1.5 ms
|
| Sep 8 2010 12:35:01:150PM | 1100908012 | Robert Granetz |
Shot 12 -- Fizzle. Gas jet trigger fired, but no gas came out with the
1.5 ms pulse width.
Next shot: gas jet disruption with 1.7 ms valve pulse; kappa=1.30
|
| Sep 8 2010 12:52:30:920PM | 1100908013 | Robert Granetz |
Shot 13 -- Plasma, disrupted by gas jet at t=1.0055 s. Much much smaller amount of gas was
injected because the valve pulse was 1.7 ms instead of 2.0 ms. kappa=1.30. Very
large 2nd peak seen on neuts_hards throughout much of the CQ. Same on edge SXR.
But still no plateau.
Next shot: disrupt with LBO W injection; turn off gas jet
|
| Sep 8 2010 01:06:55:847PM | 1100908014 | Robert Granetz |
Shot 14 -- Plasma, disrupted by LBO W injection triggered at t=1.001 s. kappa=1.29. The TQ doesn't
start until 10 ms after the laser fires. The neuts_hard signal goes away long before the
TQ, and the CQ proceeds in discrete steps. The edge SXR shows spikes at each of the steps,
but it's nearly all gone by halfway down the CQ.
Next shot: decrease kappa to 1.15; no disruption
|
| Sep 8 2010 01:19:34:403PM | 1100908015 | Robert Granetz |
Shot 15 -- Plasma, full length. 0.8 MA, 5.4 T, 0.7e20 m-2, inner limited, kappa=1.15.
P_LH=0.64 MW. Greg reports that the density is higher with this equilibrium,
perhaps because the nl_04 path length is reduced, so nl_04 feedback results in
higher nebar.
Next shot: reduce nl_04 programming by 30%
|
| Sep 8 2010 01:32:05:577PM | 1100908016 | Robert Granetz | Shot 16 -- Plasma, full length. kappa=1.16. nl_04=0.57e20 m-2. P_LH=0.65 MW. Next shot: disrupt with gas jet pulse set for 1.7 ms; also decrease P_LH=0.55-57 MW. |
| Sep 8 2010 02:23:29:240PM | 1100908017 | Robert Granetz |
Shot 17 -- Plasma, gas jet disruption at t=1.005 s using a short 1.7 ms valve pulse. kappa=1.16.
Similar to earlier shots today with moderate kappa. The CQ, neuts_hards, edge SXR signals
aren't any different at this very low elongation. Note: the gas jet plenum
pressure started at 53 bar and dropped to 52 bar.
Next shot: repeat, no changes
|
| Sep 8 2010 02:19:24:667PM | 1100908018 | Robert Granetz |
Shot 18 -- Plasma, gas jet disruption with 1.7 ms valve pulse. kappa=1.16. Similar to
preceding shot.
Next shot: repeat, but turn off LH to see if the spikes we see in the CQ are due to
LH seed or to acceleration during the disruption
|
| Sep 8 2010 02:39:44:133PM | 1100908019 | Robert Granetz |
Shot 19 -- Plasma, gas jet disruption, but without any LH. Result: no sign of hard x-rays.
So the LH is definitely creating the seed and some of those electrons are surviving into
the CQ on the previous shots. The edge SXR still showed finite signal,however.
Next shot: reduce kappa again, maybe to 1.0 or below. No disruption. LH on.
|
| Sep 8 2010 02:45:57:447PM | 1100908020 | Robert Granetz |
Shot 20 -- Plasma. Tried to get elongation lower than 1.15, but didn't succeed because the change hadn't
been loaded into DPCS.
Next shot: Try again for very low elongation (CLEARIN = -10 cm)
|
| Sep 8 2010 03:02:59:470PM | 1100908021 | Robert Granetz | Shot 21 -- Plasma, but disrupted unexpectedly at t=0.804 ms, right at the start of the LH. kappa=1.00 ! Next shot: repeat, with LH, and with gas jet. |
| Sep 8 2010 03:11:25:720PM | 1100908022 | Robert Granetz |
Shot 22 -- Plasma, but disrupted unexpectedly at t=0.69 s, before LH turned on. Gas jet fired after
the plasma was gone.
Next shot: decrease Ip to 0.6 MA and try for circular shape again
|
| Sep 8 2010 03:21:32:213PM | 1100908023 | Robert Granetz | Shot 23 -- Fizzle. Next shot: try again for circular plasma with LH and gas jet |
| Sep 8 2010 03:43:08:550PM | 1100908024 | Robert Granetz |
Shot 24 -- Plasma, disrupted by gas jet. Ip=0.6 MA, kappa=1.01, but LH didn't couple so well.
Large 2nd peak on neuts_hards, and the CQ is not smooth, but it's duration is not
extended at all.
Next shot: repeat, adjusting outer gap to better suit LH.
|
| Sep 8 2010 04:05:11:990PM | 1100908025 | Robert Granetz |
Shot 25 -- Plasma, disrupted by gas jet. P_LH=0.61 MW. Strong 2nd peak on neuts_hards, but
nothing noticeable on CQ.
Next shot: tweak outer gap to help LH reduce heating of grill in preparation for a higher
power shot after the next one
|
| Sep 8 2010 04:19:22:583PM | 1100908026 | Robert Granetz |
Shot 26 -- Plasma, disrupted by gas jet. P_LH=0.60 MW. kappa=1.02. 2nd neuts_hards peak is
higher than the peak at the TQ. No effect on CQ though. LH grill still has a few
hot spots.
Next shot: disrupt with LBO W injection; delay start of LH to reduce grill hot spot heating
|
| Sep 8 2010 04:36:14:873PM | 1100908027 | Robert Granetz |
Shot 27 -- Plasma, disrupted with LBO W injection. Slow disruption, but the neuts_hards signal
goes away before the TQ, just as in all previous W injection shots today. Kappa=1.02.
Next shot: same circular equilibrium, but disrupt by puffing lots of argon
|
| Sep 8 2010 04:40:13:300PM | 1100908028 | Robert Granetz | Shot 28 -- Fizzle Next shot: kappa=1.02, disrupted by argon puff |
| Sep 8 2010 04:55:38:670PM | 1100908029 | Robert Granetz |
Shot 29 -- Plasma, disrupted at t=1.02 s with argon puff. kappa=1.03. Neuts_hards signal is
lost by the TQ, with no sign of RE's in the CQ.
Next shot: for the last shot, repeat shot 13, which had kappa=1.30 and a large neuts_hard signal
in the CQ. Turn on gas jet. P_LH as high as possible.
|
| Sep 8 2010 05:10:19:910PM | 1100908030 | Robert Granetz |
Shot 30 -- Plasma, disrupted by gas jet. kappa=1.31. P_LH=0.68 MW. Ip=0.8 MA. Similar to
shot 13, i.e. 2nd peak in neuts_hards, but no different to CQ waveform. I think we
have conclusively shown that C-Mod is much, much less prone to disruption runaways
than any other tokamak, no matter the elongation.
End of run.
|
| Physics Operator Comments | |||
| Sep 8 2010 08:37:39:703AM | Ian Hutchinson | Use segment one we inherited from 1100903. Non cryopump.
Load from 1100217019. Check it was using segment 2. Load from 1100903015. Last week. Import Seg 2 from 1100217019. This shot is rather circular and fills the radius with an outer clearance of about 1cm (right gap). During flat top clearin is -0.07. Plan calls for clearin=-0.025m. Set this. But it will give a much more elongated plasma.This adjustment should not change right gap much. move plasma RCUR in by 2mm to .656. Flatten Ip to 0.8MA throughout. Set TF current to 150kA. Load | |
| Sep 8 2010 09:36:35:757AM | 1100908002 | Ian Hutchinson | Plasma to rampdown.
Segment 3 accidentally was left on starting at .4s This is the cause of the sudden z-change. Turn off. Reduce Ar puff to 50ms. Load. |
| Sep 8 2010 09:38:13:493AM | 1100908004 | Ian Hutchinson | Plasma to rampdown. 300kW LH. |
| Sep 8 2010 10:16:58:433AM | 1100908005 | Ian Hutchinson | Plasma. Some runaways again.
Raise fill puff to 23ms from 21ms. |
| Sep 8 2010 10:30:31:060AM | 1100908006 | Ian Hutchinson | Plasma disruption triggered at 1s by gas puff. |
| Sep 8 2010 10:56:45:890AM | 1100908007 | Ian Hutchinson | Fizzle. Base pressure is rather high prior to fill puff.
Fill puff back to 21ms. Load. |
| Sep 8 2010 11:31:50:420AM | 1100908008 | Ian Hutchinson | Plasma disrupted by Tungsten injection.
clearin to -.045m. Load. ICEF4 to -1285 from -1280A. Load |
| Sep 8 2010 11:32:26:547AM | 1100908009 | Ian Hutchinson | Reduced elongation plasma to rampdown. |
| Sep 8 2010 12:05:00:410PM | 1100908010 | Ian Hutchinson | Disrupted by gas puff at 1s. |
| Sep 8 2010 12:08:30:900PM | 1100908011 | Ian Hutchinson | Repeat. Gas disruption. |
| Sep 8 2010 12:44:51:800PM | 1100908012 | Ian Hutchinson | Fizzle. |
| Sep 8 2010 12:55:34:930PM | 1100908013 | Ian Hutchinson | Puff disruption.
ICef4 to -1290A. Load. |
| Sep 8 2010 01:16:18:297PM | 1100908014 | Ian Hutchinson | Plasma disrupted by tungsten blow off.
Clearin to -0.07m |
| Sep 8 2010 01:56:19:290PM | 1100908015 | Ian Hutchinson | Low elongation plasma.
nl04 to .4 from .6e20 to compensate for the shorter path length. Load. |
| Sep 8 2010 02:24:42:073PM | 1100908018 | Ian Hutchinson | Plasma disrupted by gas puff. |
| Sep 8 2010 02:45:14:073PM | 1100908019 | Ian Hutchinson | Disrupted by gas. No LH.
Clearin to -0.10m. Ask for OH2 limits of [-30,30] (was [-26,30]) to avoid saturation. Forgot to load. |
| Sep 8 2010 02:57:09:060PM | 1100908020 | Ian Hutchinson | Repeat without disruption.
Load. |
| Sep 8 2010 03:11:19:820PM | 1100908021 | Ian Hutchinson | Plasma disrupts at .8s seems to be hit by a brick.
Adjust ICEF4 programming to reduce gain earlier and to target zero current. |
| Sep 8 2010 03:20:10:480PM | 1100908022 | Ian Hutchinson | Plasma disrupts early at .68s.
Lower current to 0.6MA. ICEF4 tweaks more. |
| Sep 8 2010 03:38:25:483PM | 1100908023 | Ian Hutchinson | Fizzle. |
| Sep 8 2010 04:01:41:847PM | 1100908024 | Ian Hutchinson | Disrupted by gas puff.
Decrease RCUR by 2mm to .654 Further ICEF4 moderation. Load. |
| Sep 8 2010 04:09:15:490PM | 1100908025 | Ian Hutchinson | Plasma disrupted by gas puff.
RCUR to .652 from .654 to increase outer gap some more. Tweak Ip ramp. |
| Sep 8 2010 04:20:29:723PM | 1100908026 | Ian Hutchinson | Plasma disrupted by gas puff. |
| Sep 8 2010 04:37:31:463PM | 1100908027 | Ian Hutchinson | Plasma disrupted by tungsten injection.
Increase Ar pressure to 8psi Program puff at .93s to 1.13s Load |
| Sep 8 2010 04:51:19:200PM | 1100908028 | Ian Hutchinson | Fizzle. |
| Sep 8 2010 05:14:09:920PM | 1100908029 | Ian Hutchinson | Plasma disrupts at 1.01
Import segment 2 from shot 13. Load RCUR moved in 2mm. Disable argon. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:54:30:097AM | Test | Ok | Gas System Test |
| 2 | 09:02:06:900AM | Plasma | Ok | |
| 3 | 09:17:31:280AM | Plasma | Ok | |
| 4 | 09:30:31:597AM | Plasma | Ok | |
| 5 | 09:47:39:023AM | Plasma | Ok | |
| 6 | 10:14:44:230AM | Plasma | Ok | |
| 7 | 10:33:40:190AM | Plasma | Ok | |
| 8 | 10:49:26:193AM | Plasma | Ok | |
| 9 | 11:11:09:533AM | Plasma | Ok | |
| 10 | 11:29:12:123AM | Plasma | Ok | |
| 11 | 12:02:18:003PM | Plasma | Ok | |
| 12 | 12:22:59:037PM | Plasma | Ok | |
| 13 | 12:36:41:063PM | Plasma | Ok | |
| 14 | 12:53:23:713PM | Plasma | Ok | |
| 15 | 01:07:35:140PM | Plasma | Ok | |
| 16 | 01:22:40:530PM | Test | Bad | |
| 17 | 01:52:54:090PM | Plasma | Ok | |
| 18 | 02:07:38:453PM | Plasma | Ok | |
| 19 | 02:22:19:797PM | Plasma | Ok | |
| 20 | 02:35:44:480PM | Plasma | Ok | |
| 21 | 02:49:58:963PM | Plasma | Ok | |
| 22 | 03:03:42:443PM | Plasma | Ok | |
| 23 | 03:17:59:003PM | Plasma | Ok | |
| 24 | 03:30:56:780PM | Plasma | Ok | |
| 25 | 03:50:24:530PM | Plasma | Ok | |
| 26 | 04:05:59:350PM | Plasma | Ok | |
| 27 | 04:20:19:840PM | Plasma | Ok | |
| 28 | 04:34:27:127PM | Plasma | Ok | |
| 29 | 04:47:24:090PM | Plasma | Ok | |
| 30 | 05:01:57:283PM | Plasma | Ok | |
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| Sep 8 2010 08:54:08:897AM | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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