| Session Leader Comments |
| Dec 14 2010 08:57:47:130AM | 1101214001 | Jerry Hughes | Shot 1.
Gas test.
|
| Dec 14 2010 09:18:29:617AM | 1101214002 | Jerry Hughes | Shot 2.
Attempt: kappa~1.55 with JFT-2M X-point.
Result: Shape looks pretty decent. Got some RF. Mulitple H-modes, last one steady
EDA. Some nasty injections early on.
A couple of issues:
(1) Too much density because PG3 puff was left high follwing gas test.
(2) No Ne, because there was no gas programming for PG5.
PO is fixing this for next shot.
|
| Dec 14 2010 09:29:06:733AM | 1101214003 | Jerry Hughes | Shot 3.
Result: Density is better.
Plenty of Ne. Back off for next shot (40%-->30%)
X-point is not exactly at its target. But, leave as is for next shot.
|
| Dec 14 2010 09:41:59:990AM | 1101214004 | Jerry Hughes | Shot 4:
Request: TF increase by 0.1T for improved FRCECE coverage of pedestal.
Reduction of Ne puff.
Result: EDA H-mode. Still plenty of Ne. Density is still high before the H-mode
|
| Dec 14 2010 09:52:55:427AM | 1101214005 | Phil Snyder | Again we are seeing a high pedestal pressure phase early in the shot (~0.78-0.87s), and then a marked drop in pedestal pressure in the latter stages. No significant ELMs yet, presumably need to get density down.
|
| Dec 14 2010 09:54:45:733AM | 1101214005 | Jerry Hughes | Shot 5.
Request: Actually increase Bt this time. And disable H-bottom for a comparison
without a Ne puff.
Result: Bt=5.48T. FRCECE coverage is closer to spanning the LCFS. Nudge again
for next shot.
Also for next shot, reenable Ne puff and reducd puff demand from 30%-->20%
Also lower ZXU by 4 cm, and see what kind of effect on the elongation we get.
|
| Dec 14 2010 10:08:22:993AM | 1101214006 | Jerry Hughes | Shot 6.
Change to ZXU didn't change kappa, but increased upper triangularity from 0.18
to 0.27.
Result: EDA H-mode, very nice RF.
kappa=1.55
delta_u=0.28
delta_l=0.72
|
| Dec 14 2010 10:10:16:380AM | 1101214006 | Phil Snyder | Very steady EDA H-mode with ne_ped~2.4e20. Continue shape development, and then consider going back to JFT-2M shape to get density down and get ELMs.
|
| Dec 14 2010 10:22:29:893AM | 1101214007 | Jerry Hughes | Shot 7.
Result:
kappa=1.62
delta_u=0.38
delta_l=0.73
This is a decent higher elongation shot with the JFT-2M-like x-point.
Next: Make a tweak to the x-point location and lower the density demand.
|
| Dec 14 2010 10:41:04:750AM | 1101214008 | Jerry Hughes | Shot 8.
Request: Drop nl04 demand to 4e19 and raise ZXL by 0.5cm.
More RF power after 1.1s
Result:
kappa=1.6
delta_u=0.37
delta_l=0.72
Got a modest power scan in high density, EDA H-mode.
Looks like a good case to return to if we can get the density down.
|
| Dec 14 2010 10:44:37:333AM | 1101214008 | Phil Snyder | Another steady EDA H-mode at high elongation (~1.6) and triangularity (delta_u~0.36 delta_l~0.72). Density perhaps coming down slightly. Return to lower elongation to try to get lower density and ELMs.
|
| Dec 14 2010 11:02:30:533AM | 1101214009 | Jerry Hughes | Shot 9.
Request: Revert to shape parameters of shot 005.
Result: EDA H-mode. Some faulting from J-port.
kappa=1.52
delta_u=0.2
delta_l=0.72
Pedestal density is not lower. Maybe increased.
Next: reduce elongation to the standard JFT-2M case.
|
| Dec 14 2010 11:05:23:277AM | 1101214009 | Phil Snyder | Reduced elongation (~1.52) and triangularity (delta_u~0.19, delta_l~.73), but density stays fairly high and no ELMs.
Continue down to lower elongation ~1.45, typical JFT-2M shape.
The pedestal pressure is again peaking at ~0.8s in an ELM free phase before EDA fully kicks in.
|
| Dec 14 2010 11:19:52:700AM | 1101214010 | Jerry Hughes | Shot 10:
Attempt: Baseline JFT-2M shape. Possible ELM at 0.81s, leading to a fault in
E-port. Pedestal Te never really recovers.
Still a radiative EDA.
kappa=1.45
delta_u=0.14
delta_l=0.70
Next: Disable Ne and Ar.
Also have PO decrease RXL by 0.5cm to try to better match X-point location.
|
| Dec 14 2010 11:29:30:917AM | 1101214011 | Jerry Hughes | Shot 11.
Attempt: Rerun shot 010 with Ne/Ar diabled.
Result: H-mode, with major injection and disruption. Reinke informs me that
the seeding gods are "wrathful".
Next: Reduce RF demand.
|
| Dec 14 2010 11:42:52:557AM | 1101214012 | Phil Snyder | ELMing discharge in typical JFT-2M shape. Density has come down significantly with nebar~2e20 and neped~1.9e20. Thomson not well-aligned for this shape, but pedestal pressure appears in the ballpark of expected value for ELMing shot in this shape.
|
| Dec 14 2010 11:47:35:963AM | 1101214012 | Jerry Hughes | SHOT 12.
Retry with more modest RF demands. 2MW-->3MW
Got ELMs of rather significant size, fairly regular. Pedestal Te reaches
several hundred eV transiently. neped and nebar are lower than at the higher
elongation.
J-port not very happy with the ELMs, or perhaps the match to the lower
density pedestal.
|
| Dec 14 2010 11:54:16:873AM | 1101214013 | Phil Snyder | Nice ELMing period from ~0.78-0.9s before a large injection at ~0.93s leads to a high density phase for the rest of the discharge.
|
| Dec 14 2010 11:57:31:663AM | 1101214013 | Jerry Hughes | Shot 13.
Retry shot 012 with improved RF, and attempting to further reduce the L-mode density.
Result: Good start. A hot H-mode with ELMs. Injection at 0.92 kills it.
RF performs suprising well throughout this, the back-transition and the
subsequent L-H to EDA H-mode. The nl04 feedback does its job after
0.9s.
Next: Put some Ne back in.
|
| Dec 14 2010 12:11:46:117PM | 1101214014 | Jerry Hughes | Shot 14.
Ne coming through H-bottom at 1.5psi fill, 50% duty cycle.
H-modes with no ELMs, and high radiation. There is some QCM activity.
Next: lower Ne puff.
|
| Dec 14 2010 12:36:31:380PM | 1101214015 | Jerry Hughes | Shot 15.
Retry with reduced Ne seeding.
Result: Some ELMy periods. Zeff is rather high, so plenty of Ne. Still getting
injections.
I am concerned that we are spending too much time trying to optimize seeding
instead of getting on with the shape scans.
Next: Disable Ne, come in more gently with the initial RF pulse. Hopefully
get a case we can compare with later discharges at higher elongation.
|
| Dec 14 2010 12:45:43:860PM | 1101214016 | Jerry Hughes | Shot 16.
Request: Come in with a slower power ramp early. No Ne seeding.
Result: due to a miscommunication, the RF was programmed with a step instead
of a ramp to 2MW. H-mode was late, and the nl04 step up demand at 0.9s
overfuels the plasma, leading to EDA H-mode.
Big injections when power is raised. We've seen this before. I can't
tell where the injection is coming from, but I am suspicious of the strike point
position. Having PO shift RXL inboard for next shot. Also fixing RF demand,
and moving the nl04 step-up to 1.0s
|
| Dec 14 2010 12:56:10:850PM | 1101214017 | Phil Snyder | Good shot, with a relatively steady period of ELMs mixed with QC. Increased RF power seems to lead to an injection at ~1.3s. Pedestal Te8 roughly steady at ~600eV from 0.8-1.2s.
Ready to start elongation scan.
|
| Dec 14 2010 01:02:20:610PM | 1101214017 | Jerry Hughes | Shot 17:
Request RXL move inboard by 0.5cm
Result: EFIT says strike point is off the floor tiles which have given us
trouble in the past. No big injections
ELMy H-mode
kappa=1.46
delta_u=0.15
delta_l=0.76
nebar before H-mode=1.2--1.4e20
Next: Recover elongation of shot 9.
|
| Dec 14 2010 01:09:19:747PM | 1101214018 | Phil Snyder | Nice shot with substantial ELMs at kappa~1.52. Two periods of high pedestal temperature from ~0.75-0.9s and 1.2-1.35s. RF power is a bit uneven.
|
| Dec 14 2010 01:15:46:817PM | 1101214018 | Jerry Hughes | Shot 18:
Attempt: Higher kappa.
Result: Nicely ELMing, with two distinct high Te,ped phases.
kappa=1.52
delta_u=0.18
delta_l=0.79
nebar before H-mode=1e20
|
| Dec 14 2010 01:26:51:620PM | 1101214019 | Phil Snyder | Very brief hot ELMing phase from ~0.75-.88s, then a large injection occurs and density rises substantially. Later phase has high density with ELMs.
|
| Dec 14 2010 01:31:55:077PM | 1101214019 | Jerry Hughes |
Shot 19.
Attempt to repeat shot 18 with improved RF match, but also with X-point
adjusted slightly to match the positioning on shot 17.
Result: Shot showed some promise early, then a big injection at 0.89s.
But there are ELMs, evolving with the discharge prior to that.
Next: Go to higher elongation.
|
| Dec 14 2010 01:42:47:933PM | 1101214020 | Jerry Hughes | Shot 20.
Attempt: Reproduce the shape of shot 8.
Result: X-point needs a tweak, but generally okay shape.
kappa=1.6
delta_l=0.8
delta_u=0.37
nebar in Ohmic phase=9e19
|
| Dec 14 2010 01:47:10:953PM | 1101214020 | Phil Snyder | Pedestal gets quite high in the early phase, but no significant ELMs. May be a sign that we've improved the pedestal stability so much (via improved shaping) that we can no longer reach the limit (perhaps radiatively limited). Calculations suggest the peeling-ballooning stability boundary should be substantially higher in this shape than in the base JFT-2M shape.
kappa~1.6, delta_u~.37, delta_l~0.8
|
| Dec 14 2010 02:00:22:720PM | 1101214021 | Jerry Hughes | Shot 21.
Retry shot 020 with an X-point tweak.
Result: Shape looks good. X-point looks good. No ELMs.
kappa=1.61
delta_l=0.76
delta_u=0.38
nebar in Ohmic phase=9e19
Next: Decrease upper triangularity
|
| Dec 14 2010 02:14:42:473PM | 1101214022 | Jerry Hughes | Shot 22.
Try to achieve weaker shaping at crown:
Result: No ELMs.
kappa=1.62
delta_l=0.76
delta_u=0.38
nebar in Ohmic phase=1.1e20
Next: Try for more of a power ramp.
|
| Dec 14 2010 02:22:28:837PM | 1101214023 | Phil Snyder | Again has a high pedestal pressure phase from ~0.8-0.95s, but apparently not high enough to trigger ELMs. Radiated power is large, and takes off after ~1.2s - having trouble getting net power (injected - radiated) up despite RF ramp to 4MW.
|
| Dec 14 2010 02:34:34:803PM | 1101214023 | Jerry Hughes | Shot 23:
Attempt: More of a power ramp. at the high kappa point.
Result: Again, early high Te H-mode with no ELMs. Pedestal density is
considerably higher than at the lower kappa. Input power cannot keep up with
radiation, and Te drops for a long period in flattop.
Interestingly, in this and shot 022, there seems to be improvement in
performance after the strike point begins its sweep out after 1.2s.
It would be interesting to try this with seeding.
Instead, we will try to stay focused and go for an elongation intermediate
between 1.52 and 1.62.
|
| Dec 14 2010 02:47:57:537PM | 1101214024 | Jerry Hughes | SHot 24.
Good ELMing data in the initial H-mode phase. Healthy Te,ped. Killed by an injection, unfortunately.
kappa=1.58
delta_l=0.76
delta_u=0.15
nebar in Ohmic phase=1.05e20
|
| Dec 14 2010 02:55:23:950PM | 1101214024 | Phil Snyder | Elongation reduced slightly to kappa~1.58. Triangularity reduced as well.
Now ELMs return. Nice high pedestal ELMing from ~0.8-0.95s, before an injection and disruption.
Speculation: It's starting to look like there's an effective limit on how high we can get the pedestal just based on radiative losses etc. If this limit is above the peeling-ballooning boundary (as it is in the JFT-2M shape) then we get an ELMing discharge. As we increase elongation and increase the P-B boundary, we eventually find a point where we can no longer get to the P-B limit and get ELMs (though presumably if we could reduce radiative losses somehow we could impact this). It looks like that transition point happens around kappa~1.58. (at higher density the QC mode comes in also)
|
| Dec 14 2010 02:58:06:820PM | 1101214025 | Jerry Hughes | Shot 25.
Retry shot 024 with higher density.
Ohmic nebar hits 1.7e20.
H-mode density stays fairly low. There are ELMs.
Next: Retry with reduced early density program.
|
| Dec 14 2010 03:14:40:643PM | 1101214026 | Jerry Hughes | Shot 26.
Attempt: Repeat 024 with an increased target density, not overfuelled like
025 was.
Result: Good shot. Clear ELMs at 0.87s and 0.99s. No clear QCM activity.
kappa=1.58
delta_l=0.76
delta_u=0.15
nebar in Ohmic phase=1.15e20
Some peculiar density fluctuations are showing up in PCI and reflectometry
on some of these shots, in the ~200kHz range and fairly narrowband. Center
frequency is modulated by the sawtooth heat pulse.
|
| Dec 14 2010 03:15:12:417PM | 1101214026 | Phil Snyder | Two large ELMs and 3 small ones before an injection at ~1.05s.
|
| Dec 14 2010 03:39:44:863PM | 1101214027 | Jerry Hughes | Shot 27.
Attempt: Slightly higher ohmic density.
Result: This is weird. At first I thought the thing detatched at 0.5s due to the
extra puffing. But there's a Te pedestal there! So it is Ohmic H-mode until
0.7s. Why?
|
| Dec 14 2010 03:36:41:607PM | 1101214028 | Phil Snyder | ELMing period with robust pedestal from ~0.8-0.9s.
|
| Dec 14 2010 03:44:55:320PM | 1101214028 | Jerry Hughes | Shot 28.
Retry 026 with a higher power ramp rate.
Result:
kappa=1.59
delta_l=0.76
delta_u=0.15
nebar in Ohmic phase=1.2e20
The big ELMs from shot 026 aren't there, but there are some smaller ELMs between
0.8 and 0.9s, when the Te is elevated.
Next: Reload shot 19 and raise nl04 demand slightly.
|
| Dec 14 2010 03:52:33:630PM | 1101214029 | Phil Snyder | Nice shot. Long periods of fairly steady ELMs with controlled density and radiated power. Very promising candidate for analysis, including ELM-synched analysis.
|
| Dec 14 2010 04:00:31:057PM | 1101214029 | Jerry Hughes | Shot 29.
Attempt: Go back to shot 019 and increase nl04 by 1e19.
Result: A really fantastic looking shot!
There are 2 distinct ELMy periods, with varying power balance and density. RF
couples well throughout. ELM frequency drops later in the shot, when pedestal
pressure is higher. Scales the wrong way for Type I ELMs.
kappa=1.54
delta_u=0.19
delta_l=0.77
nebar before H-mode=1.2e20
|
| Sep 1 2011 08:31:45:757AM | 1101214029 | Jerry Hughes | There are some interesting high-frequency fluctuations on the 88GHz
reflectometer, coming up just before ELMs.
and also on magnetics:
The fluctuations persist in the higher density phase with longer ELM period,
and the lab frame frequency scales with the edge Te:
|
| Dec 14 2010 04:16:24:560PM | 1101214030 | Jerry Hughes | Shot 30.
Good shot. Plenty of ELMs to look at, with a good scan in Te,ped.
kappa=1.54
delta_u=0.20
delta_l=0.77
Ohmic nebar =1.6e20
|
| Dec 14 2010 04:17:35:123PM | 1101214030 | Phil Snyder | Another good shot for analysis with lots of ELMs. Somewhat higher neped (and lower teped) in early phase, compared to shot 29.
|
| Dec 14 2010 04:34:15:763PM | 1101214031 | Phil Snyder | Yet another good shot for analysis with lots of ELMs after the recovery from a back-transition, ~1.1-1.4s.
Pedestal density significantly higher, ~2.5e20, and teped looks a bit lower.
|
| Dec 14 2010 04:34:20:263PM | 1101214031 | Jerry Hughes | Shot 31
Attempt: More density.
Result: It looks like we're near the end of our ability to raise density.
QCM has reappeared in the early H-mode! Pure ELMs back in the latter phases.
Good shot.
kappa=1.53
delta_u=0.20
delta_l=0.78
Ohmic nebar =1.7e20
As on shot 027, there is on Ohmic H-mode associated with the extra fueling.
Something to follow up on?
|
| Dec 14 2010 04:47:05:193PM | 1101214032 | Jerry Hughes | Shot 32
Attempt: Reload 29 and increase upper triangularity
Result: Matches 29 pretty well in terms of global parameters, but the initial
H-mode phase is completely ELM-free! The radiation in the H-mode rises
faster!
kappa=1.55
delta_u=0.34
delta_l=0.77
Ohmic nebar=1.2e20
|
| Dec 14 2010 04:59:12:047PM | 1101214033 | Jerry Hughes | Shot 33.
Attempt: A large move of RXU relative to 032 in order to try for a very
low triangularity.
Result: Seem to have pushed it to far. Lost control. No H-mode either.
Scratch this and move on to a high delta_L, lower kappa case.
|
| Dec 14 2010 05:16:31:200PM | 1101214033 | Jerry Hughes | Shot 33.
Attempt: Low kappa, high delta_u
Result: Fizzle.
EOR
|
| Physics Operator Comments |
| Dec 14 2010 08:57:14:903AM | 1101214001 | Steve Scott | Setup from 1101117025 with changes as described in PO_PLAN.
This shot: gas test only. increase PG3 to be flattop at demand
of 80 (no change to duration of the PG3 puff).
Outcome: successful no-power shot with gas.
|
| Dec 14 2010 09:15:50:500AM | 1101214002 | Steve Scott | return PG3 puffing to that of 1101117025.
Start boronization recovery with RF power.
Outcome: PhysOp error: I apparently did not load the new PG3 gas puff programming. So gas puff was same as previous shot --> got high
plasma density. Also, we did not get the requested H-bottom (PG5) puff
of neon.
Next shot: re-load PG3 programming as per 1101117025 and also add the
H-bottom PG5 puff of neon (40%, 0.4-0.6 sec).
|
| Dec 14 2010 09:29:26:013AM | 1101214003 | Steve Scott | result: got 1 - 2.5 MW RF, womewhat ratty time PRF time history.
Halpha is about factor 3-4 higher than 1101117025 and NeL during H-modes is high (circa 1.7e20 m^-2) compared to 1.3e20 on shot 1101117025.
Next shot: raise BT by 2% to tweek locations of FRC-ECE (ITF increases from
150 to 153 kA) and decrease PG5 demand level from 40 to 30.
|
| Dec 14 2010 09:39:30:513AM | 1101214004 | Steve Scott | result: apparently I changed the TF demand only in segment 1, not in segment 2.
So we did not get the desired 2% increase in BT.
Next shot: increase ITF demand in segment 2 to -153 kA.
Also remove the neon puff in PG5.
|
| Dec 14 2010 09:40:07:197AM | 1101214004 | Steve Scott | result: apparently I changed the TF demand only in segment 1, not in segment 2.
So we did not get the desired 2% increase in BT.
Next shot: increase ITF demand in segment 2 to -153 kA.
Also disable H-bottom to remove the neon puff.
|
| Dec 14 2010 09:58:06:630AM | 1101214005 | Steve Scott | Result: got the desired increase in BT. Pretty good PRF waveform at 3 MW.
Pretty steady radiated power at 0.3 MW. Density is still higher than
1101117025 and the Halpha level is still several times higher.
full-length plasma.
*
* next shot
*
Increase ITF to 153567 in order to nudge BT up by 0.02 Tesla.
re-enable H-bottom, and decrease demand level on PG5 from 30 to 20.
also, reduce ZXU demand from 0.08 to 0.04 during flattop.
|
| Dec 14 2010 10:08:17:307AM | 1101214006 | Steve Scott | Good shot. Very steady PRF at 3 MW, steady Wtot (about 1.4 times taue89),
steady Prad at 0.7 MW, steady density at 1.7e20. EDA H-mode.
small injection at 1.25 sec.
disrupted in rampdown at 1.7 sec (at about 0.5 MA).
upper triangularity increased from 0.18 --> 0.27 on this shot.
*
* next shot
*
Increase Zcur from -0.01 --> 0.00
Decrease ZXU from 0.04 --> 0.02
|
| Dec 14 2010 10:16:57:637AM | 1101214007 | Steve Scott | Result: good EDA H-mode, steady PRF=3 MW. small injection at 1.25 sec.
disrupted again in rampdown at 1.7 sec.
Kappa increased to about 1.6 on this shot.
|
| Dec 14 2010 10:25:25:537AM | 1101214007 | Steve Scott | Result: good EDA H-mode, steady PRF=3 MW. small injection at 1.25 sec.
disrupted again in rampdown at 1.7 sec.
Kappa increased to about 1.6 on this shot.
NeL is still high at 1.6-1.7e20.
*
* next shot
*
1. decrease NeL demand from 5.e19 to 4.e19
2. increase ZXU from 0.012 to 0.017
3. increase PRF to 4 MW
|
| Dec 14 2010 10:41:18:967AM | 1101214008 | Steve Scott | Result: target NeL decreased slightly and NeL during RF decreased slightly as
well. good RF at 3--> 4 MW. disrupted in rampdown at 1.72 sec.
No increase in Prad when RF power increases from 3 to 4 MW.
*
* This will be the "high-elongation" equilibrium. park it for later study.
*
* next shot
*
1. Return ZCUR and ZXU to conditions of shot 5.
2. ZCUR set to -0.01. ZXU set to +0.08
3. Reduce RXL from -0.035 to -0.040
|
| Dec 14 2010 10:46:10:710AM | 1101214009 | Steve Scott | result: good EDA H-mode. disrupted in rampdown at 1.7 sec.
Nel still about 1.6-1,7e20, PRF = 3-4 MW, tauE = 1.5 x taue89.
Achieved roughly desired shape.
*
* Next shot
*
1.
|
| Dec 14 2010 10:48:21:510AM | 1101214009 | Steve Scott | result: good EDA H-mode. disrupted in rampdown at 1.7 sec.
Nel still about 1.6-1,7e20, PRF = 3-4 MW, tauE = 1.5 x taue89.
Achieved roughly desired shape.
*
* Next shot
*
1. decrease ZCUR from -0.01 to -0.025
|
| Dec 14 2010 10:57:03:057AM | 1101214009 | Steve Scott | result: good EDA H-mode. disrupted in rampdown at 1.7 sec.
Nel still about 1.6-1,7e20, PRF = 3-4 MW, tauE = 1.5 x taue89.
Achieved roughly desired shape.
*
* Problem: after the shot, all torus gate values closed due to pressure
* excursion. there will be a delay while we investigate.
*
* Next shot
*
1. Decrease ZCUR from -0.01 to -0.025
2. Add 1.0 MW of RF power from 1.5 to 1.7 sec (i.e. into rampdown) in an
effort to eliminate the disruption during rampdown.
|
| Dec 14 2010 11:12:34:650AM | 1101214010 | Steve Scott | Result: good plasma. A couple of ELMs and/or backtransitions.
Disruption delayed until circa 1.78 sec.
*
* Next shot
*
1.
|
| Dec 14 2010 11:19:02:880AM | 1101214010 | Steve Scott | Result: good plasma. A couple of ELMs and/or backtransitions.
I think the backtransitions are caused by faults in the RF power.
Disruption delayed until circa 1.78 sec.
*
* Next shot
*
1. disable H-bot and B-side lower
2. add another 100 ms to the RF in rampdown.
3. Decrease RXL by 5 mm, from -0.04 to -0.045
|
| Dec 14 2010 11:30:52:410AM | 1101214011 | Steve Scott | Result: disrupted at about 0.79 sec due to moly injection.
*
* Next shot
*
1. reduce early PRF to 2.0 MW, otherwise repeat of last shot
|
| Dec 14 2010 11:45:49:190AM | 1101214012 | Steve Scott | result: full length shot - no disruption in rampdown.
lots of ELMs, resulting in a very ratty PRF waveform (1 to 2 MW).
NeL remains at about 1.0e20.
*
* Next shot
*
1. decrease NeL demand 4.0 --> 3.0e19 early, but then increase NeL demand
to 8.0e19 from 0.9 to 1.5 sec.
|
| Dec 14 2010 11:55:40:233AM | 1101214013 | Steve Scott | Result: full length shot. Better PRF waveform.
Some early ELMs, plus some impurity injections at 0.92 and circa 1.3 sec.
*
* Next shot
*
1. decrease fill pressure in H-bot (neon) to 1.5 pounds
2. enable H-bot
3. increase demand on PG5 from 20 to 50
|
| Dec 14 2010 11:55:48:900AM | 1101214013 | Steve Scott | Result: full length shot. Better PRF waveform.
Some early ELMs, plus some impurity injections at 0.92 and circa 1.3 sec.
*
* Next shot
*
1. decrease fill pressure in H-bot (neon) to 1.5 pounds
2. enable H-bot
3. increase demand on PG5 from 20 to 50
|
| Dec 14 2010 12:17:09:690PM | 1101214014 | Steve Scott | result: good shot, disrupted in rampdown at 1.78 sec.
No apparent ELMS. Two back transitions during RF ... maybe we put in
too much neon? Good PRF waveform at 2-3 MW.
Zeff=4 during RF
*
* Next shot
*
1. reduce demand on Neon (PG5) from 50 to 20.
|
| Dec 14 2010 12:44:42:960PM | 1101214015 | Steve Scott | Result: good shot, full length.
Moderate-sized injection @0.82 sec.
Lots of ELMs. PRF waveform is pretty good, 2 --> 3 MW.
Nel=1.3e20 and taue = 1.5 x Lmode
Zeff about 3.6
*
* Next shot
*
1. turn off neon (H-bot).
2. reduce early PRF -- hopefully to avoid the early impurity injections.
3. adjust PRF waveform
|
| Dec 14 2010 12:59:28:647PM | 1101214017 | Steve Scott | Result: full length shot. No major impurity injections (!) which Jerry
attributes to the small adjustment in the lower strike point.
NeL = 1.2e20. PRF = 2 - 3 MW with a few dropouts when 3 MW is reached.
*
* Next shot: push up the elongation
*
1. increase ZCUR -0.025 --> -0.010 (as on shot 009 today)
2. leave ZXU at 0.080 (as on shot 009 also)
|
| Dec 14 2010 01:13:30:197PM | 1101214018 | Steve Scott | Result: full length shot with ELMs that please the SL. Prad under control
and no major impurity injections. NeL = 1.1. RF waveform is pretty ratty.
EFIT says that the separatrix is just grazing the inner belt limitr at the
bottom.
*
* Next shot
*
1. Increase RXl from -0.050 to -0.045.
2. Tweak the RF parameters to reduce faulting.
3. reduce ZXL from 0.017 to 0.012
|
| Dec 14 2010 01:30:32:323PM | 1101214019 | Steve Scott | Result: full length plasma. Impurity injection at 0.89 sec.
NeL is higher than in previous shot ... maybe due to adjustment in
position of lower X-point?
Prad remains higher than in previous two shots.
Pretty good PRF waveform, 2 --> 3 MW.
*
* Next shot: return to elongation on shot 8
*
1. ZCUR set to 0.
2. ZXU set to 0.02
|
| Dec 14 2010 01:40:27:650PM | 1101214020 | Steve Scott | Result: full length shot. No ELMs? or maybe small, grassy ELMs.
PRF = 2 --> 3 MW.
*
* Next shot: increase RXL by 0.5 cm.
*
|
| Dec 14 2010 01:41:35:173PM | 1101214020 | Steve Scott | Result: full length shot. No ELMs? or maybe small, grassy ELMs.
No obvious Prad spikes. PRF = 2 --> 3 MW.
*
* Next shot: increase RXL by 0.5 cm.
*
|
| Dec 14 2010 01:57:09:027PM | 1101214021 | Steve Scott | Result: full length plasma. Injection at 0.89 sec. no ELMs.
*
* Next shot: decrease upper triangularity
*
1. Increase RXU by 6 cm (!!). RXU = -0.015 --> +0.045
|
| Dec 14 2010 02:11:00:780PM | 1101214022 | Steve Scott | Result: full length plasma, but no ELMs. Confinement is almost L-mode at 1.0 sec;
is better earlier, when Prad is smaller.
Late RF trip seems to cause a back transition.
See a big reduction in upper triangularity (down to circa 0.2) compared
to previous shot.
*
* Next shot
*
1. Increase RF power.
|
| Dec 14 2010 02:32:17:903PM | 1101214023 | Steve Scott | Result: plasma that disrupts at 1.48 sec. There is an early period
of good confinement and a late period of good confinement.
Got to 4 MW of RF power late.
There is a late impurity injection that seems to kill the late
period of good confinement, but whether it is also the cause of the
disruption is unclear. No ELMs.
*
* Next shot
*
1. Increase ZXU from 0.02 to 0.05
2. Decrease ZCUR from 0.0 to -0.005
|
| Dec 14 2010 02:45:18:697PM | 1101214024 | Steve Scott | Result: plasma with ELMs. A brick, bowling ball etc. fell in at about
1.07 sec, leading to a disruption at 1.1 sec.
*
* Next shot
*
1. Increase target NeL from 3.e19 to 4.e19 ... hopefully this will
eliminate the fatal impurity injection without eliminating the ELMs.
|
| Dec 14 2010 02:54:19:573PM | 1101214025 | Steve Scott | Result: full length plasma with ELMs. Target density rose a lot,
to 9.e19. Small injection at 1.03. RF waveform is ratty.
*
* Next shot
*
1. Change NeL programming: reduce target NeL from 4.0e19 to 3.0e19
before 0.5 sec. after 0.5 sec, leave it unchanged from previous shot.
|
| Dec 14 2010 03:06:24:397PM | 1101214026 | Steve Scott | Result: full length plasma with ELMs. A moderate-sized impurity injection
at about 1.03 sec. PRF to 4 MW. NeL is more like shot 24 - about 6.e19 before
start of RF.
*
* Next shot
*
1.
|
| Dec 14 2010 03:08:34:393PM | 1101214026 | Steve Scott | Result: full length plasma with ELMs. A moderate-sized impurity injection
at about 1.03 sec. PRF to 4 MW. NeL is more like shot 24 - about 6.e19 before
start of RF.
*
* Next shot
*
1. Increase target NeL from 4.0 to 5.0e19 for t=0.5 to 1.0 sec.
|
| Dec 14 2010 03:23:32:067PM | 1101214027 | Steve Scott | Result: plasma, disrupts at 1.6. The target NeL rises to 1.1e20 (compared
to demand of 5.e19) and the Halpha is 3-4x higher than in previous shot ...
is there a Marfe or other detachment? RF waveform is ratty; little or no
power from D-antenna.
*
* Next shot
*
1. Decrease target NeL back to level of shot 26 (= 4.e19 for t=0.5 to 1.0 sec).
2. Bring RF power up faster.
|
| Dec 14 2010 03:45:42:653PM | 1101214028 | Steve Scott | Result: plasma, but disrupts early at 1.05 sec. There is a big Prad burst
0.9-0.95 sec, maybe leading to locking and then a disruption.
*
* Next shot: reload shot 19 from today and raise its target NeL
* from 3.e19 to 4.e19 between t=0.5 and t=1.0 sec. Also get the
* PRF waveform from shot 19.
|
| Dec 14 2010 03:54:11:737PM | 1101214029 | Steve Scott | Result: very nice shot, disrupts in rampdown at 1.75 sec.
Very well-behaved radiated power. Has nice ELMs. Late in
RF, taue is 1.4 - 1.6 x Lmode.
*
* Next shot: start density scan in this configuration
*
1. Increase target NeL from 4.0e19 to 5.0e19 over time t=0.5-1.0 sec.
|
| Dec 14 2010 04:08:05:863PM | 1101214030 | Steve Scott | Result: very nice shot, similar to 29. full length.
Has Elms. Similar pedestal density, but some differences in
time evolution of pedestal Te compared to shot 30.
*
* Next shot
*
|
| Dec 14 2010 04:15:38:307PM | 1101214030 | Steve Scott | Result: very nice shot, similar to 29. full length.
Has Elms. Similar pedestal density, but some differences in
time evolution of pedestal Te compared to shot 30.
*
Transiently, taue reaches 1.8 x Lmode late in the shot, when PRF=3 MW.
At the same time, tauE reaches about 1.1 x taue98(Hmode)
*
* Next shot: continue density scan at this configuration
*
1. Increase target NeL from 5.e19 to 6.e19 for t=0.5-1.0 sec.
|
| Dec 14 2010 04:30:31:413PM | 1101214031 | Steve Scott | Another nice full length shot with ELMs. transiently drops out
of Hmode at about 0.93 sec, maybe due to RF glitch. Target NeL
is about 1.1e20, i.e. considerably larger than the demand of
6.e19.
*
* Next shot: reload from shot our favorite shot 29 and change RXU
*
1. Decrease RXU -0.015 --> -0.065 , i.e. move it in 5 cm, in order
to increase upper triangularity.
|
| Dec 14 2010 04:48:05:110PM | 1101214032 | Steve Scott | Result: somewhat to the surprise of the physics operator, this shot
went through OK. Achieved the desired large increase in upper
triangularity. Most plasma parameters similar to shot 29. Early in
RF heating phase, this shot gets somewhat higher Wtot.
*
Has ELMs late.
*
* Next shot: reduce upper triangularity significantly
*
1. Move RXU out by 10 cm (!!) from -0.065 to +0.035
|
| Dec 14 2010 04:58:11:470PM | 1101214033 | Steve Scott | result: plasma disrupted at 1.0 sec due to railing on EF2 upper.
*
* Next shot
*
1. reload shot 32 and reduce ZCUR from -0.01 to -0.02.
|
| Dec 14 2010 05:06:26:393PM | 1101214034 | Steve Scott | Result: fizzle/dud. sigh.
*
***************************************
*
* end of run for today
*
*
|
| System Availability |
| Dec 14 2010 08:51:17:970AM |
| System | Available | Comment | Availability
Changed | Owner | Description | Who Can
Change | | Active MHD | no | secured - tagged out | Jun 02 2008 11:03AM (sears) | Joe Snipes | Active MHD Antenna | sears,snipes | | BES | yes | BES system is online | Oct 21 2010 11:33AM (bespam) | Bill Rowan | Beam Emission Spectroscopy | bespam,liao,rowan | | Bolometers | yes | 2pi (D+F) working. All midplane and off-midplane diode arrays working except WB1AX. Midplane foils calibrated and PRAD_MAIN is being filled. Divertor/Ledge foils not yet ready. | Jul 15 2010 08:27AM (mlreinke) | Matt Reinke | Bolometers | hutch,mlreinke | | Boronization | yes | | Nov 16 2010 02:36PM (dekow) | Jim Irby | Boronization | dekow,irby | | CNPA | yes | Multiple channel CNPA available | Oct 21 2010 07:11PM (parker) | Ron Parker | Compact Neutral Analyzer | parker | | Cryopump - Upper Divertor | no | Shut down. Helium dewar removed. LN2 manual valve and solenoid valves are closed and tagged. | Apr 06 2010 10:51AM (labombard) | Brian LaBombard | Upper Divertor Cryopump | irby,labombard | | CXRS | yes | Wide-view CXRS system is online | Oct 21 2010 11:33AM (bespam) | Bill Rowan | Charge Exchange Spectroscopy | bespam,blip,liao,rachmcd,rowan | | D Alpha | yes | \ha2_bright is available; \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 is not available | Jul 01 2009 09:45AM (terry) | Jim Terry | Balmer Alpha Monitor | irby,terry,wolfe | | Dalsa | yes | system is aligned; new calibrations (relative brightness and position) not yet implemented | Jun 29 2010 10:27AM (marmar) | Earl Marmar | Visible Bremsstrahlung | marmar | | Disruption Mitigation | yes | operational, but turned off | Nov 03 2009 04:59PM (granetz) | Robert Granetz | Gas Jet | granetz,whyte | | Divertor IR | no | | Mar 06 2007 10:50AM | Glen Wurden | Divertor IR Digital Video | gwurden,terry | | Divertor IR Spectroscopy | no | | Mar 06 2007 10:51AM | Glen Wurden | Divertor IR Spectroscopy | gwurden,terry | | DNB | no | in test mode only | Nov 03 2009 05:01PM (granetz) | Robert Granetz | Diagnostic Neutral Beam | dterry,granetz,gung | | ECDC | yes | Operational | Jun 26 2010 09:28PM (irby) | Jim Irby | 2.45 GHz, 3 kW, discharge cleaning system | dekow,irby,pfeiffer | | FRC-ECE | yes | All channels working and calibrated. | Oct 27 2010 03:41PM (phillips) | Perry Phillips | Heterodyne ECE-32 channels | phillips | | G-Side Ratiomatic | yes | Gauges are operational. | Jun 28 2010 08:02PM (labombard) | Brian LaBombard | G-side ratiomatic ionization gauge | labombard,toland | | Glow Discharge | no | Plugs for Power Supply and Controls have been unplugged and red tagged making system safe for In-Vessel Access. | Apr 05 2010 11:18AM (dekow) | Jim Irby | 1 kV, 5 A, glow discharge system | dekow,dterry,irby | | GPC | yes | Operational. | Jul 28 2009 04:23PM (hubbard) | Amanda Hubbard | ECE Polychromater | hubbard,schmidt | | GPC2 | yes | Most channels operational. | Oct 22 2010 11:46AM (hubbard) | Amanda Hubbard | ECE Polychromater | hubbard,schmidt | | GPI | yes | The Xpt-view, the midplane-view cameras are operational. The innerwall GPI (coupled to the fast-diodes) is available. | Jul 01 2009 09:45AM (terry) | Jim Terry | Gas Puff Imaging | terry,zweben | | H/D | yes | operating normally | Jun 29 2010 10:26AM (marmar) | Earl Marmar | H/D Ratio | marmar | | HEAT | yes | | Jun 26 2010 11:19PM (dekow) | Gary Dekow | - Machine Heaters - | burke,dekow | | Hirex Jr | yes | Hirex-Jr has been installed | Jun 28 2010 03:36PM (rice) | John Rice | High Resolution X-Ray | ince,rice | | Hirex Sr | yes | System installed and aligned. Inverted profiles are still not available. | Jul 22 2010 08:41AM (ypodpaly) | John Rice | High Resolution X-Ray | ince,rice,ypodpaly | | HXR | yes | 32 Channels operational | Oct 23 2010 01:41PM (parker) | Ron Parker | Hard X-Ray Array | faust,parker,schmidt | | ICRF D-Antenna | yes | system checked out ok on 11006728. | Jun 28 2010 04:57PM (ylin) | Steve Wukitch | D-port antenna | wukitch,ylin | | ICRF E-Antenna | yes | system checked out ok on 1100628 | Jun 28 2010 04:57PM (ylin) | Steve Wukitch | E-port antenna | wukitch,ylin | | ICRF J-Antenna | yes | system checked out ok. conditioned to vacuum. | Jun 28 2010 04:58PM (ylin) | Steve Wukitch | J-port antenna | wukitch,ylin | | Laser Blow-Off | yes | operational and tested | Jul 20 2010 04:42PM (g) | Martin Greenwald | Impurity Injection System | g,nthoward | | Lower Hybrid | yes | LH working. New directional couplers installed at input to each klystron. | Oct 21 2010 11:42AM (dterry) | Ron Parker | Lower Hybrid | dterry,parker,wallaceg | | Lower Hybrid Reflectometer | yes | 50GHz: up-, 60 GHz up- and down- | Oct 21 2010 11:31AM (sgbaek) | Arturo Dominguez | Lower Hybrid Reflectometer | dominguez,marmar,parker,sgbaek | | Lower Hybrid SOL reflectometer | yes | differential phase (profile) working since 8/27/2010. full phase (fluctuations + profile) is not. If put on a miniproposal, please request LH launcher to be moved in | Oct 05 2010 11:26AM (cornwall) | Cornwall Lau | Lower Hybrid SOL reflectometer | cornwall,wukitch,ylin | | LPI | no | Beam line removed | May 30 2008 02:09PM (bose) | Earl Marmar | Lithium Pellet Injector | bose,marmar | | Ly-alpha | no | WB4LY and LLY working but not during ICRF. WB1LY not attached due to pickup problems. LYMID attached but have profile problems. | Aug 24 2010 09:17AM (mlreinke) | Matt Reinke | Lyman alpha cameras | labombard,mlreinke | | McPherson | yes | Spectra being collected and tree filled. Wavelength scan is broken so fixed on the Mo XXXI and XXXII lines. | Jul 15 2010 08:28AM (mlreinke) | Jim Terry | VUV Spectrometer | mlreinke,terry | | Michelson | yes | Operational. | Oct 22 2010 11:46AM (hubbard) | Amanda Hubbard | ECE Te Profiles | hubbard,schmidt | | MKS | yes | Gauges are operational | Jun 28 2010 08:02PM (labombard) | Brian LaBombard | Baratron pressure gauges | labombard | | MLP | no | System is in edge lab. Version 2 drivers ready to test. Needs a student to help work on it. | Jul 14 2009 09:20PM (labombard) | Brian LaBombard | Mirror Langmuir Probe Electronics System | labombard | | MSE | no | As of 6/10/09, MSE is calibrated & ready to go. Awaiting DNB. | Jun 10 2009 10:34AM (sscott) | Steve Scott | Motional Stark Effect | jinseok,sscott | | Neutrons | yes | All systems are on and functional | Jun 29 2010 12:56PM (fiore) | Catherine Fiore | Neutron Detectors | fiore | | Neuts and Hards | yes | PMT Neuts_hards, ssd_x01, ssd_x02, ssd_x03 | Jun 26 2010 09:21PM (irby) | Jim Irby | X-Ray/Neutron Detectors at K-Hor | irby | | NINJA | no | Capillaries tested in-vessel. | Jun 28 2010 08:08PM (labombard) | Brian LaBombard | NINJA gas puff | labombard,terry | | PCI | yes | Operational. AM (2 * 39.51) MHz. | Dec 13 2010 05:29PM (ntsujii) | Miklos Porkolab | Phase Contrast Imaging | ennever,ntsujii,porkolab | | Penning Gauges | no | High voltage power supplies are turned off, waiting for work at A-port horizontal to be finished. | Jun 28 2010 08:07PM (labombard) | Brian LaBombard | Penning Ionization Gauges | labombard | | Plasma TV | yes | WIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational. | Jul 01 2009 09:46AM (terry) | Jim Terry | Video of plasma via several cameras | dekow,irby,terry,wolfe | | Polarimeter | no | Safe for Machine Entry | Sep 14 2007 12:17PM (irby) | Jim Irby | C-Mod Polarimeter | irby | | Power - Alternator Air Switch | yes | | Jun 26 2010 11:19PM (dekow) | Gary Dekow | feeds all the other supplies | cochran,dekow,dterry,irby | | Power - PEI | yes | | Jun 26 2010 11:19PM (dekow) | Gary Dekow | PEI System | cochran,dekow,dterry,irby | | Power - TMX | yes | | Jun 26 2010 11:19PM (dekow) | Gary Dekow | Ef2s,. EFCs and A-Coils | byford,cochran,dekow,dterry,irby | | Power Systems | yes | | Jun 26 2010 11:20PM (dekow) | Jim Irby | C-Mod Magnet Supplies | byford,cochran,dekow,dterry,irby | | Probe Array - ISD | yes | Operational. | Jun 28 2010 08:03PM (labombard) | Brian Labombard | Inner Lower Divertor Probe Array | labombard | | Probe Array - LH | yes | Operational. | Jun 28 2010 08:03PM (labombard) | Brian LaBombard | Lower Hybrid Probe Array | labombard | | Probe Array - OSD | yes | F and J outer divertor probes are operational. | Jun 28 2010 08:04PM (labombard) | Brian LaBombard | Outer Lower Divertor Probe Array | labombard | | Probe Array - UDIV | yes | Operational, except probe#13 | Jun 28 2010 08:04PM (labombard) | Brian LaBombard | Upper Divertor Probe Array | labombard | | Reflectometer | yes | As of 1101123, the 60, 88u, 88l, 140 and variable set at 115GHz are operational. The 50, 75 and 112 are nonoperational. On 1101123, the noise band at ~200kHz is again seen on the 88u and 88l channels. | Nov 23 2010 09:30AM (dominguez) | Earl Marmar | Reflectometer | dominguez,marmar | | Scanning Probe - ASP | yes | Operational. New Langmuir-Mach probe head installed. | Jun 28 2010 08:05PM (labombard) | Brian LaBombard | A-Port Scanning Probe | labombard | | Scanning Probe - FSP | yes | Operational. | Jun 28 2010 08:05PM (labombard) | Brian LaBombard | F-Port Scanning Probe | labombard | | Scanning Probe - WASP | yes | Both A and K units are operational. Coil polarity needs to be checked. | Jun 28 2010 08:06PM (labombard) | Brian LaBombard | Inner Wall Scanning Probe | labombard,nsmick | | Sparker | yes | HV supply on, cable run to sparker at k-hor | Jun 23 2010 02:41PM (irby) | Jim Irby | Field Emission Preionization for C-Mod | dekow,irby,parkin | | Surface Science Station | yes | SSS installed and leak tested. | Oct 21 2010 11:31AM (ochoukov) | Bruce Lipschultz | Radially scanning probe located on K-port | blip,ochoukov | | TCI | yes | No new CO2 detector, so still missing edge channels | Jun 23 2010 02:40PM (irby) | Jim Irby | Two-Color Interferometer | irby,murray | | TS - Core | yes | Operating with 2 lasers | Oct 22 2010 01:06PM (jwhughes) | Jerry Hughes | Core Thomson scattering | jwhughes,yma | | TS - Edge | yes | Operational | Jul 14 2010 11:54AM (jwhughes) | Jerry Hughes | Millimeter resolution edge Thomson scattering | jwhughes,yma | | Vispec | no | 350 and 670 nm, 4 spatial channels | Nov 28 2007 09:58AM (agraf) | Alex Graf | Visible Spectrometer | agraf | | XEUS | yes | Operational. Raw spectra stored but not line brightness time histories are going into the tree yet. | Aug 24 2010 09:17AM (mlreinke) | Matt Reinke | X-ray Extended Ultraviolet Spectrometer | mlreinke | | XTOMO | yes | Core system working. Edge system waiting for H-modes. | Jul 01 2010 11:55AM (mlreinke) | Bob Granetz | X-Ray Tomography | granetz,mlreinke |
|
| Dec 14 2010 09:10:28:393AM |
Shutter was closed this shot
manually open it
|