| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Bill Rowan,Nathan Howard |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Sam Pierson,Bill Parkin,Bill Byford |
| Engineering Operator Run Comment |
| automatically entered by signon - please replace with real comment |
| Session Leader Plans |
| Entered: Dec 1 2009 10:11:57:910AM |
| Author: Bill Rowan |
| Helium trace transport
In this experiment, we will detemine whether we can do trace helium transport experiments using the WideView CXRS diagnostic. The level of puffed helium will be varied to detemine first the detection threshold and then the level for measurement of the helium density profile. Effect of these levels on the discharge will be assessed. In previous experiments on other devices, levels as high as 10% were thought to be acceptable. Two different gratings will be tested in the WideView CXRS diagnostic. The gratings differ in dispersion and selection will be based on efficiency of the grating and on the need to discriminate against background spectra. This is not an off-line study because we have absolutely no experience in making observations in this spectral range with the CXRS diagnostic. Although the DNB will eventually be needed for the helium trace transport experiments, measurements of ambient spectra and some modeling will suffice for the goals of this half day experiment. We are depending on thermal charge exchange and electron impact for excitation of the relevant helium spectrum Start with nl_04 = 0.7e+20. Use the low dispersion grating. Take a few shots with no helium to measure the background spectrum. Are there interfering spectra? This may require more than one shot. Search for detection limits. Inject helium with a pulse length of 50 ms and increase by 50 ms on subsequent shots. Can we achieve a signal level that is 10 times background? Rule of thumb for easy CXRS temperature and rotation measurements. Turn the helium off and look for residual Install high dispersion grating. Set the helium injection to the detection limit level found for the low dispersion grating. Are the detection limits about the same? If not, take shots with different injection pulse lengths. Can we achieve a signal level that is 10 times background? Increase the plasma density to approximately nl_04 to approximately 1.0e+20 to compare results for background spectra |
| Entered: Dec 1 2009 04:58:44:250PM |
| Author: Nathan Howard |
| Afternoon Run Plan MP586a
-------------------------------- Impurity Transport Studies in L-Mode Plasmas 1.5 Days --------------------------------------------------------------------- The purpose of these experiments is to use the newly commissioned laser blow-off system to investigate the dependence of the impurity fluxes as a function of local plasma parameters through scans in safety factor, input power, and density. This will allow for a more general characterization of the particle flux that can directly be compared with turbulent transport theories as well as provide insight into the relevant factors into the impurity flux for later experiments. The list of target plasmas for each shot is presented below. This experiment consists of parameter scans in ne (nl04 of .6, .9, 1.2, 1.5x10^20), Ip (.6, .8, 1.0, 1.2 MA), and Pin (ohmic, 1.0, 2.0, 3.0, 4.0 MW) for effective scans in density, q95, and Te. --------------------------------------------------------------------- USN Reference shot: 1090915014 (for equilibrium only, see below for RF, Bt, etc.) Cryopump: On Working Gas Species: D2 Argon puffing for Er profiles from HiREX Sr. Laser Blow-Off: Yes Density: nl04 of .6, .9, 1.2, 1.5x10^20 Boronization Requested: No Standard ECDC Overnight Toroidal Field: 5.4 T Plasma Current: .6, .8, 1.0, 1.2 MA ICRF Power: D & E antennae: 80 MHZ, maximum power J-antennae: 78 MHz, maximum power needed to supplement D and E to get to 4 MW RF power steps for all shots are programmed as the following: Until 0.7 sec: Ohmic, 0.7-0.9 sec: 1 MW, 0.9-1.1 sec: 2 MW, 1.1-1.3 sec: 3 MW, 1.3-1.5 sec: 4 MW (unless otherwise specified) --Diagnostics: --------------------------------------------------------------------- -ECE (all channels) for Te -Thomson, edge and core, for ne and Te -HIREX Sr., Rotation information and Er information - McPherson (VUV), scanning shot to shot. Mostly on the outer half of the plasma to supplement the views provided LLNL spectrometer - Soft X-ray arrays - LLNL spectrometer (if available) - HIREX Jr. (for He-like Ca line) - Reflectometry (if available) during at least one injection period. (To verify injection as non-peturbative in a turbulent fluctuation sense and look for I-mode transitions at higher power.) -PCI set up for low frequency, low k fluctuations digitized during the entire flat-top ----------------------------------------------------------------------- --Shot Plan: ----------------------------------------------------------------------- Each plasma shot will operate at a fixed density and current while the ICRF is incremented in 1 MW steps every 200 ms from .7 to 1.3 seconds. Initially 5 impurity injections will be introduced into the plasma approximately 65 ms after each RF step. This corresponds to injections at .565, .765, .965, 1.165, and 1.365 seconds. This number might be reduced to four injections if the inter-injection time is not sufficient to extract impurity transport information. 1. At fixed density nl04= 0.6x 10^20 (1/m^3): Scan in Ip at fixed Bt=5.4 T (4 shots) Ip=0.6 MA, 5 heating steps, Ohmic and 1-4 MW (1 MW steps) Ip=0.8 MA, 5 heating steps, Ohmic and 1-4 MW (1 MW steps) Ip=1.0 MA, 5 heating steps, Ohmic and 1-4 MW (1 MW steps) Ip=1.2 MA, 5 heating steps, Ohmic and 1-4 MW (1 MW steps) 2. At fixed density nl04= 0.9x 10^20 (1/m^3): Scan in Ip at fixed Bt=5.4 T (4 shots) Ip=0.6 MA, 5 heating steps, Ohmic and 1-4 MW (1 MW steps) Ip=0.8 MA, 5 heating steps, Ohmic and 1-4 MW (1 MW steps) Ip=1.0 MA, 5 heating steps, Ohmic and 1-4 MW (1 MW steps) Ip=1.2 MA, 5 heating steps, Ohmic and 1-4 MW (1 MW steps) 3. At fixed density nl04= 1.2x 10^20 (1/m^3): Scan in Ip at fixed Bt=5.4 T (4 shots) Ip=0.6 MA, 5 heating steps, Ohmic and 1-4 MW (1 MW steps) Ip=0.8 MA, 5 heating steps, Ohmic and 1-4 MW (1 MW steps) Ip=1.0 MA, 5 heating steps, Ohmic and 1-4 MW (1 MW steps) Ip=1.2 MA, 5 heating steps, Ohmic and 1-4 MW (1 MW steps) 4. At fixed density nl04= 1.5x 10^20 (1/m^3): Scan in Ip at fixed Bt=5.4 T (4 shots) Ip=0.6 MA, 5 heating steps, Ohmic and 1-4 MW (1 MW steps) Ip=0.8 MA, 5 heating steps, Ohmic and 1-4 MW (1 MW steps) Ip=1.0 MA, 5 heating steps, Ohmic and 1-4 MW (1 MW steps) Ip=1.2 MA, 5 heating steps, Ohmic and 1-4 MW (1 MW steps) ------------------------------------------------------------------- 16 shots total (effective scans in T, n, and q) |
| Physics Operators Plans |
| Entered: Dec 1 2009 03:04:38:770PM |
| Author: Steve Wolfe |
| Physop plan and engineering setup for Wed, Dec 2, 2009
MP#482 (sort of) "CXRS diag development" (Morning) MP#586a "Impurity Studies in L-mode plasmas" (Afternoon) SL: Rowan, Liao (MP#482) Howard (MP#586a) PO: wolfe ----------------- Engineering Setup ----------------- ------------------------------ ECDC Parameters (overnight) ------------------------------ gas and pressure: D2 at 2e-4 Torr sweep: 44/45/103 cm scan: 20/120 s Run begins at 09:00 and ends at 17:00 Power systems as on: 1091007019 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 15 psi He4 Hybrid DISABLED (PG1) **NOTE Unusual gas** 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, HiREX Sr, Z-bolo Torvac gatevalve toggle (yes/no): No Boronization(yes/no): no Overnight ECDC (yes/no): YES ICRF(yes/no): Allowed for first half-day (late in shot),required for afternoon LH(yes/no): no Cryopump (yes/no): YES (afternoon portion only) Vessel temperature: 35/35/35 ------------------------------------------------------- Physics Operator Plans: Part 1, CXRS helium diagnostic: For the morning run, start with PCS setup from 1091007019 (6.5e19,800kA,150ka) May as well take the startup as well, the differences from last week are a small tweak on the drawn rcur, the pg4 width and the pg3 puff in seg1. I may want to try using some integral gain on nl04, just to see how it does. Note that the present nl04 gains are [P,D,I]=[7,6,0]. Depending on results, I may also want to program a finite target for the b21_proj early in the shot, if we encounter locked modes (more likely at high current in the second half of the day). For this I would need to change the ref on wire#9-12 from Ip to 10, and zero the unused strkpsi observer on wire 11. Per the SL plan and communication with the SL (in absentia), the first shots will be without helium puff. Then turn on b-side lower (pg1) for 50msec puff of He4, and increase shot by shot by 50msec until they see helium on their spectrometer with adequate S/N, or until we get to pure helium discharge. Then turn off the pg1 puff and look for residual helium. Following the SL_PLAN, the spectroscopists will then change to a high dispersion grating and go back to the puff at the limit of detectability for the first grating and check S/N. If there is time, raise density to 1e20 to compare results for background spectra. During the morning run, ICRF is not required, but the RF group can tune up (especially J-port) during the last part of the flattop (t>1.4sec) Part 2, Laser blow-off Impurity transport: Load seg3 from seg2 of 1090915014 and recalculate predictors for f15dead (do this ahead of time). Turn on cryopump and raise pg4 in seg1 accordingly; move puff to -0.3sec. Pump out b-side lower and replace with 1psi Argon, enable with 75ms puff (pg1). Reduce current to 600kA, nl04 to 6e19, raise TF to -150kA; RF should program according to SL_PLAN (steps 1,2,3,4 MW). The target shot had fairly flat density with a step at rf turn-on, using no feedforward and [P,D]=[9,6]; may want to adjust these (lower P, add some I, maybe add some pg3 feedforward). According to the MP, raise current to .8,1.0,1.2MA at same density. Then repeat this series at nl04=9e19, same currents (step 2) If there is any time left, repeat at nl04=1.2e20 and 1.5e20 (steps 3 and 4, Friday's problem, most likely). Note that I need to monitor the elongation and triang as the current changes, may need to tweak IC_EF4 and/or EF2_BY_EF4. |
| Session Leader Summaries |
| Entered: Dec 3 2009 08:30:25:823AM |
| Author: Bill Rowan |
| It looks as though trace helium transport experiments are possible using the WideView CXRS diagnostic. The concentration of ambient helium in the discharge can be increased to a level that saturates the CXRS detector while not seriously affecting the edge electron temperature. Only the local density of fully stripped helium is needed for the trace transport experiment. Since the beam was not available for the experiments, some modeling based on the ambient spectra will be required to tell us whether rotation and temperature measurements can be made simultaneously with density measurement. Of the two gratings used today, the high dispersion grating is more appropriate for the experiments. Given the signal levels, an even higher dispersion grating could be used and would likely improve the measurements, but this is actually another issue for modeling.
A remaining concern is the persistence of helium in the discharge. It was observed throughout the afternoon although our experiment and helium puffing ended at 13:00. Observations of helium spectra will continue over the next few days. |
| Entered: Dec 5 2009 09:47:36:817PM |
| Author: Nathan Howard |
| MP586a Afternoon run
Shots 19-34 The run started the scan at a nl04 density of .6e20. There were a number of fizzles and disruptions, especially when trying to access the low density and high current shots. Cryopump problems were the reason for some fizzles. I achieved 5 impurity injections of CaF2 in each plasma shot that are visible on HiReX Jr (although some high voltage trips occured on some shots) and on Mcpherson which was looking at Li-like Ca. The RF was fairly consistent and gave good temperature scans during each shot. Over the course of the half run day we were able to achieve all of the .6e20 conditions (4 total, .6 .8, 1.0, 1.2 MA). An initial look at the results shows that in addition to scaling with an increase in the impurity confinement time with an increase in plasma current (or perhaps q) and a much more interesting result that the confinement time decreases with increasing temperature. The density scan for this proposal was achieved during the 12/04 run. |
| Physics Operator Summaries |
| Entered: Dec 2 2009 05:59:47:420PM |
| Author: Steve Wolfe |
Physop Summary for Wed, Dec 2, 2009
MP#482 (sort of) CXRS Development, SL: Rowan, Liao
MP#586a Impurity transport studies, SL: Howard
PO: wolfe
EO: Pierson, Parkin, Byford
The machine ran relatively well today. The morning run was pretty
simple from the physop point of view, one basic plasma configuration
800kA, LSN, mostly at 6.5e19 with a couple of shots at the end at 1.0e20.
The only programmatic changes were the helium 4 puff from b-side lower,
as the spectroscopists checked out their signal levels and backgrounds
in preparation for helium transport studies. This was apparently quite
successful; see SL_SUMMARY for details. During this part of the run, I made
a few gas tweaks to deal with runaways, which weren't that bad. I also
tried the Igain on nl04 for the last couple of shots, at 1e20; this seemed
to work pretty well, although it may have been superfluous.
On shot#18 we changed MP's to Nathan's experiment, using upper null
with cryopump and doing current scans at fixed density, while the
rf staircased and Nathan did his laser blow-off thing. This part of the
run was more problematic, but we managed to get through the first
of his four major steps, and he will get to finish this off on Friday.
The first shot (#18) had a cryopump dump in INIT, but the next went ok and the
rf worked well at 6e19 and 600kA. I played with the density control
all through the afternoon, trying to reduce the oscillations associated
with the rf steps and pump-outs; this was somewhat successful, but there is
still no generally applicable formula I can point to.
Another major
problem encountered and partially possibly dealt with in this part of the
run was the early locked mode. This effect has been giving us
trouble in moderately low-density upper null shots at surprisingly low
currents, and today we had such an event already on an 800kA shot (#22).
Instead of mucking with the b21_Proj coefficients, I adjusted the target
waveform to ask for 1G (+1e-4 T) early in the shot, ramping back down to zero
in flattop (around 1sec). This seemed to help, at least to the extent that
we didn't get locked mode disruptions after shot#25, and we went up to
1.2MA at 6e19. The effect of this programming is to increase the A-coil current, which has previously been established as the right direction. However, it may have been a mistake to leave this programming
in place when we went back down to 600kA at the end of the day, as there
may have been a locked mode during a marfe period between .55 and .7sec
on these shots. I didn't notice this until after the run, but it might have
been interesting to remove the extra demand on these low current cases which
may have been causing the acoil to overcorrect. Nathan will probably
want to start with this case, 600kA, 9e19, on Friday.
The remaining physop problem during the afternoon run was runaways. Increasing
the fill to 66msec (with cryopump) was not sufficient. I also tried adjusting
the segment 1 rcur offset to 2500 and the waveform itself, moving the target
plasma in by several cm. The best "cure" for the runaways seemed to be that
they seemed to be suppressed after high current disruptions. Of course, so
does the plasma, and we had several post-disruption fizzles, but the succeeding
plasmas tended to be disruption free. Consistent with loaded (or dirty)
walls being good, leading to higher density at 20msec, even more than raising
the fill. Maybe the right answer is to ecdc between shots.
In addition to the usual issues, we had a recurrence of the mysterious
fft trigger failure, which got "fixed" by Yijun changing the trigger
channel on the dio2 and also rebooting. The RF also had trouble with
a strange bug in their waveform generator, which is believed to have been
fixed by removing an invalid reference in an init action in the tree (see
Yijun's note in the logbook). We also had a couple of no-power shots due
to data system problems, including the attempted last shot (after 17:00)
which did not register as a shot, as well as shot#6; the latter was
probably associated with a problem with the Active MHD/fast magnetics
data acquisition on pcdaqamhd. Toward the end of the day, the TORVAC
plc lost the ability to reset the IGT when it tripped, necessitating cell
accesses to reset it manually. On the plus side, the power systems
performed perfectly all day.
Scorecard:
No Power shots 2
Duds 0
Fizzles 4
Plasmas 29 (25 into rampdown)
========= ==
Shots 35 (although #35 was an "un-shot" with no data)
|
| Session Leader Comments | |||
| Dec 2 2009 07:56:01:923AM | Bill Rowan | The experiments will begin with the high dispersion grating rather than with the low dispersion grating. Our initial off-line tests with the two gratings (which arrived in the lab yesterday) show the expected difference in dispersion. The transmission for the high dispersion grating appears to be quite good. There are a sufficient number of wavelength calibration lines of adequate strength within its bandpass. The grating switch planned for later in the morning will still happen.
The initial shots will be used to identify interfering spectra. | |
| Dec 2 2009 09:08:11:487AM | 1091202001 | Bill Rowan | 001. First shot okay. Strong line observed. |
| Dec 2 2009 09:21:34:490AM | 1091202002 | Bill Rowan | 002. Repeat of shot 001. Looks the same. No new info. On to helium puff on the next shot. |
| Dec 2 2009 09:38:18:707AM | 1091202003 | Bill Rowan | 003. 50 ms pulse produced the helium spectrum. Will continue to somewhat longer pulses on subsequent shots, but will explore less helium. |
| Dec 2 2009 09:51:08:220AM | 1091202004 | Bill Rowan | 004. disrupted before the puff
helium puff timing: 100 ms start at 0.5 s |
| Dec 2 2009 09:59:53:540AM | 1091202005 | Bill Rowan | 005. Helium puff at 0.5 s. duration: 0.1s |
| Dec 2 2009 10:17:50:637AM | 1091202006 | Bill Rowan | 006. No power shot. |
| Dec 2 2009 10:28:30:110AM | 1091202007 | Bill Rowan | 007. 150 ms helium pulse length
signal is increasing. This is beyond the level that we need for good measurements. |
| Dec 2 2009 10:52:05:827AM | 1091202008 | Bill Rowan | 008. 75 ms helium puff |
| Dec 2 2009 11:04:24:687AM | 1091202009 | Bill Rowan | 009. repeat to get some info on the residual helium |
| Dec 2 2009 11:11:46:843AM | 1091202010 | Bill Rowan | 010. 25 ms helium pulse |
| Dec 2 2009 11:37:49:170AM | 1091202011 | Bill Rowan | 011. 25 ms helium pulse |
| Dec 2 2009 11:46:16:390AM | 1091202012 | Bill Rowan | 012. No helium pulse. |
| Dec 2 2009 11:57:54:047AM | 1091202013 | Bill Rowan | 013. 25 ms helium pulse |
| Dec 2 2009 12:20:55:453PM | 1091202014 | Bill Rowan | 014. helium pulse to 50 ms. |
| Dec 2 2009 12:32:19:547PM | 1091202015 | Bill Rowan | 015. no helium pulse |
| Dec 2 2009 12:44:05:967PM | 1091202016 | Bill Rowan | 016. 25 ms pulse of helium |
| Dec 2 2009 12:58:15:390PM | 1091202017 | Bill Rowan | 017. 35 ms pulse of helium
This is the end of this part of the run. |
| Dec 2 2009 01:16:28:810PM | 1091202018 | Nathan Howard | First shot target was:
nl04= .6x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=.6 MA ----------------------------------------------- No Cryopump. Fizzle Repeat on the following shot. |
| Dec 2 2009 01:35:03:170PM | 1091202019 | Nathan Howard | Shot target was: (Repeat of attempt on shot 18)
nl04= .6x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=.6 MA ----------------------------------------------- Cryopump enabled. Density is a little bumpy due to RF steps but not bad. All impurity injections look good on HIREX Jr. Good temperature increase and good looking RF. |
| Dec 2 2009 01:42:14:263PM | 1091202020 | Nathan Howard | Moving to the next current, shot target was:
nl04= .6x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=.8 MA ----------------------------------------------- Good Injections but no RF. Repeating this shot |
| Dec 2 2009 01:57:52:810PM | 1091202021 | Nathan Howard | Shot target is: (repeat of shot 20)
nl04= .6x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=.8 MA ----------------------------------------------- Good Injections and RF was good. The density climbs a little more than desired for the last 2 injections but is approximately .6 for the first 3. There is an apparent temperature dependence in the confinement time based on the HIREX data. Current looks good throughout and spectroscopic signals look good. |
| Dec 2 2009 02:03:44:983PM | 1091202021 | Nathan Howard | Shot target is:
nl04= .6x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=.8 MA ----------------------------------------------- Good Injections and RF was good. The density climbs a little more than desired for the last 2 injections but is approximately .6 for the first 3. There is an apparent temperature dependence in the confinement time based on the HIREX data. Current looks good throughout and spectroscopic signals look good. We are going to try this shot again to get the last two injection points. |
| Dec 2 2009 02:10:06:263PM | 1091202022 | Nathan Howard | Shot target is:
nl04= .6x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=.8 MA ----------------------------------------------- Early Disruption, moving on to next current |
| Dec 2 2009 02:24:15:123PM | 1091202023 | Nathan Howard | Shot target is:
nl04= .6x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=1.0 MA ----------------------------------------------- Early Disruption at approximately .6 sec. Retrying this shot... |
| Dec 2 2009 02:35:50:500PM | 1091202024 | Nathan Howard | Shot target is:
nl04= .6x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=1.0 MA ----------------------------------------------- Fizzle. Retrying this shot... |
| Dec 2 2009 02:47:49:170PM | 1091202025 | Nathan Howard | Shot target is:
nl04= .6x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=1.0 MA ----------------------------------------------- Good Injections, good density, etc. But....no RF. Retry this shot with RF... |
| Dec 2 2009 03:04:01:470PM | 1091202026 | Nathan Howard | Shot target is:
nl04= .6x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=1.0 MA ----------------------------------------------- Good Injections, good density, RF is pretty good except the last 2 steps, but lost HIREX Jr. We are going to retry once more at this current. |
| Dec 2 2009 03:16:30:657PM | 1091202027 | Nathan Howard | Shot target is:
nl04= .6x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=1.0 MA ----------------------------------------------- Good Injections, a little bumpy on the density and 3 of the 4 RF Steps worked. HIREX Jr data looks good except last injection. This is probably due the RF trip. Moving on... |
| Dec 2 2009 03:26:55:420PM | 1091202028 | Nathan Howard | Shot target is:
nl04= .6x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=1.2 MA ----------------------------------------------- Early disruption approximately .2 sec. Retrying shot... |
| Dec 2 2009 03:41:51:890PM | 1091202029 | Nathan Howard | Shot target is:
nl04= .6x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=1.2 MA ---------------------------------------------- Cryopump problems. Fizzle again. Retrying... |
| Dec 2 2009 03:56:06:530PM | 1091202030 | Nathan Howard | Shot target is:
nl04= .6x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=1.2 MA ---------------------------------------------- Cryo worked. Injections are good and density is good. No RF. Retrying to get the RF. |
| Dec 2 2009 04:10:36:577PM | 1091202031 | Nathan Howard | Shot target is:
nl04= .6x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=1.2 MA ---------------------------------------------- Fizzle. Retrying... |
| Dec 2 2009 04:28:00:343PM | 1091202032 | Nathan Howard | Shot target is:
nl04= .6x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=1.2 MA ---------------------------------------------- Good Injections, pretty good density, RF is a little trippy but not horrible. Hirex data is present for the first 2 injections after that there is a high voltage trip. Moving on to next density and back to lower current for next shot |
| Dec 2 2009 04:46:20:047PM | 1091202033 | Nathan Howard | Shot target is:
nl04= .9x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=.6 MA ---------------------------------------------- RF trips are a problem and MARFE. Retrying on the next shot |
| Dec 2 2009 04:59:32:203PM | 1091202034 | Nathan Howard | Shot target is:
nl04= .9x10^20 1 MW RF steps at .7, .9, 1.1, 1.3 seconds with injections following each step by 65 ms. Ip=.6 MA ---------------------------------------------- RF trips again but overall pretty good density and injections are good. Only really got the 1 MW step and the 3 MW step to be clean. We will retry that shot as the last of the day.. |
| Physics Operator Comments | |||
| Dec 2 2009 07:22:07:643AM | Steve Wolfe |
Setting up for Wednesday, Dec 2, 2009
Load from 1091007019 for AM run (MP#482)
Import seg3 from seg2 of 1090915014 for PM run MP#586a
Ack config widget
Recall preds on wire 1,2,3,4,5,6,7,8. Build_seg, no errors
In seg3 All_p's: Ip from 800 to 600ka, nl04 from 8e19 to 6e19
V1-16: tf from -139 to -150kA
V17-32: remove pg5 gas puff, amhd_freq traces
Build_seg again, just for fun
In seg2: change wire 11 from strkpsi to zero11
change ref9-12 from Ip to 10
Examining the all-p screen, note that the rxl,zxl waveforms are
strange, moving in and down through the flatttop. I guess that's
what Brian wanted that day for strikepoint control, not sure why
Bill would want it, probably doesn't matter. EFIT shows near constant
strike at z=-48cm, which I think is above the W row.
On v1-16 confirm that pg1 is 50msec at .30sec, no pg3
Notice I've got the oh1_crossover procedure loaded, but not enabled.
PG4 is at 27msec, good enough place to start.
Build all completes ok, no errors.
Load at 2-Dec-2009 07:21:56.00
Open tree /home/wolfe/pcs_scratch -1
Open tree done
| |
| Dec 2 2009 09:09:20:080AM | 1091202001 | Steve Wolfe | Shot#1: Program 800kA, 6.5e19, LSN as on 1091007019 pg4=27msec Result: plasma full length, no runaways, nl04=6e19 Looks ok, ECE request was not enabled. Next: repeat, no dpcs changes |
| Dec 2 2009 09:19:26:580AM | 1091202002 | Steve Wolfe | Shot#2: repeat, no dpcs changes plasma full length no runaways Next: pg1 on at .5sec for 50msec |
| Dec 2 2009 09:33:20:177AM | 1091202003 | Steve Wolfe | Shot#3: pg1 on at .5sec for 50msec, bside-lower enabled (He4 15psi) RF will fire at 1.4 to 1.5sec Result: plasma full length, no runaways, got the puff Got to 0.2 arbs on the HeII monitor, |
| Dec 2 2009 09:48:30:127AM | 1091202004 | Steve Wolfe | Shot#4: pg1 on at .5sec for 100msec, bside-lower enabled (He4 15psi) Result: plasma at 0.4sec, big injection not obvious why. Actually looks like two events, first at 0.367sec, second at .388sec Next: repeat, no changes hope it's random. |
| Dec 2 2009 10:00:14:933AM | 1091202005 | Steve Wolfe | Shot#5: pg1 on at .5sec for 100msec, bside-lower enabled (He4 15psi) Result: plasma full length, looked like a bit of a marfe early, no runaways HeII monitor up to .5au, density is increased to 7.1e19 pg3 off, so we're fueling with Helium. Next: up to 150msec |
| Dec 2 2009 10:15:37:900AM | 1091202006 | Steve Wolfe | Shot#6: pg1 on at .5sec for 150msec, bside-lower enabled (He4 15psi) decrease pg3 in seg1, try to tame the marfe Result: Data system hang. could be related to turning on active mhd nodes and taking a test shot before this shot, although nodes were turned back off before init. Except they are on now.Maybe josh turned it on after ted turned it off. No power shot |
| Dec 2 2009 10:30:07:640AM | 1091202007 | Steve Wolfe | Shot#7: pg1 on at .5sec for 150msec, bside-lower enabled (He4 15psi) decrease pg3 in seg1, try to tame the marfe Result: plasma full length, no runaways, HeII at 0.7au marfe gone Next: 75msec on pg1 |
| Dec 2 2009 10:48:31:873AM | 1091202008 | Steve Wolfe | Shot#8: pg1 on at .5sec for 75msec, bside-lower enabled (He4 15psi) decrease pg3 in seg1, try to tame the marfe Result: plasma full length, no runaways, no marfe, nl04 6.8e19, HeII dropping from .7 to .6 during flattop. Next: repeat |
| Dec 2 2009 10:59:29:700AM | 1091202009 | Steve Wolfe | Shot#9: repeat, see if the helium goes down some more. (75msec) Result: plasma full length, a hint of runwaways nl04~7e19, HeII drops to .5 during flattop Next: 25msec, pg4 up a tad |
| Dec 2 2009 11:01:33:890AM | 1091202009 | Steve Wolfe | Shot#10: pg1 to 25msec, pg4 (seg1) from 27 to 30msec Have lost phone contact with remote SL, proceeding per last instructions until he redials. |
| Dec 2 2009 11:14:03:030AM | 1091202010 | Steve Wolfe | Shot#10: pg1 to 25msec, pg4 (seg1) from 27 to 30msec Result: plasma full length, runaways a little worse (4e12) HeII down to .1 to .2au; nl04 back to 6e19 and puffing pg3 through flattop. Next: No pg1 pulse, |
| Dec 2 2009 11:38:28:797AM | 1091202011 | Steve Wolfe | Shot#11: pg1 off (zero trace in pcs), pg4 (seg1) from 30 to 33msec Result: plasma full length, runaways gone, no marfe, HeII still around 0.1au, nl04 at 6e19 and puffing pg3 through flattop Actually, it looks like I didn't load the chnge to pg1, got 25msec Op error Next: Grating change, leave Helium puff off (no DPCS changes) |
| Dec 2 2009 11:45:27:280AM | 1091202012 | Steve Wolfe | Shot#12: pg1 really off (zero trace in pcs,reloaded), grating changed to "high res" RF will be off until this afternoon (all tuned up, I suppose) Delay an extra ~5min to let detector cool down after grating change Result: plasma full length, no runaways HeII monitor around 0.05au, really no pg1 puff. Next: Pg1 back on to 25msec |
| Dec 2 2009 11:58:41:500AM | 1091202013 | Steve Wolfe | Shot#13: Pg1 back on to 25msec plasma full length, no runaways, Looks like pcdaqdpcs2 timed out again, Yijun going in to poke fibers Shot looks ok, got puff Next: pg1 to 50msec |
| Dec 2 2009 12:19:47:970PM | 1091202014 | Steve Wolfe | Shot#14: pg1 to 50msec Delay for two data sys issues: pcdaqdpcs2 (E-port FFT) trigger (Yijun) and "long pulse" crate in power room (Jas and Bill P.) Result: plasma full length, short marfe-like event at .144sec HeII monitor ~.2 to .3 Next:No helium, nl04 to 1e20 |
| Dec 2 2009 12:32:19:263PM | 1091202015 | Steve Wolfe | Shot#15: No helium (pg1 zeroed), nl04 to 1e20 Result: plasma full length, no runaways, marfe mostly gone nl04~9.4e19, could use a little more gain (I?) or feedforward HeII ~.04au. Next: 25msec on pg1 |
| Dec 2 2009 12:46:19:780PM | 1091202016 | Steve Wolfe | Shot#16: 25msec on pg1, Try Igain=2 on nl04 from 0.4 to 2sec PG4 still at 33msec Result: plasma full length nlo4 flat at 1e20, Igain seems to be working. Next: 35ms he pulse, and then Bill is done |
| Dec 2 2009 12:59:36:530PM | 1091202017 | Steve Wolfe | Shot#17: 35ms he pulse (PG1), and then Bill is done with the first half run. reduce Igain on nl04 from 2 to 1 Result: Plasma full length, density still looks good, got the helium Next: Changing over to Nathan's part of the run. |
| Dec 2 2009 01:17:59:843PM | 1091202018 | Steve Wolfe | Shot#18: Changing over to Nathan's part of the run. Seg2 off, Seg3 on Cryopump will be on, so pg3 from 33 to 53msec (end to -.3sec) Check seg3 has 600ka, 6e19, upper null program from 1090915014 Will probably overshoot on current, have to see; also look at crossover, perhaps turn on crossover routine. [P,D,I]=[9,6,0] ; will probably want to drop P and increase I, but see what happens first. Load at 2-Dec-2009 13:07:30.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Cryo-pump seems to have dumped, 1.1e-6 in pulse. There was a delay for cryo, and the cryopump re-genned once, didn't hold. Fizzle. |
| Dec 2 2009 01:33:54:110PM | 1091202019 | Steve Wolfe | Shot#20: Second try at cryopump startup for MP#586a No PCS changes yet. IGT=1.1e-7 in INIT, pg4 still at 53msec Result: plasma full length, very dim on tv density a bit lumpy on rf pulses, gas is off after 1.1sec. nl04 between 6 and 7e19. Not sure I can do much about that. Startup looks good. Some oscillation on ef2, ef4 could add some D gain Next: Dgain on ef2byef4 to 2 at 0.3sec, Ip to 800kA |
| Dec 2 2009 01:36:58:953PM | 1091202019 | Steve Wolfe | Shot#19: Second try at cryopump startup for MP#586a No PCS changes yet. IGT=1.1e-7 in INIT, pg4 still at 53msec Result: plasma full length, very dim on tv density a bit lumpy on rf pulses, gas is off after 1.1sec. nl04 between 6 and 7e19. Not sure I can do much about that. Startup looks good. Some oscillation on ef2, ef4 could add some D gain Next: Dgain on ef2byef4 to 2 at 0.3sec, Ip to 800kA |
| Dec 2 2009 01:41:55:500PM | 1091202020 | Steve Wolfe | Shot#20: Dgain on ef2byef4 to 2 at 0.3sec, Ip to 800kA pg4 still at 53msec Result: plasma full length, runaways bad, need to raise pg4 RF not there. density is flat. Current ok. Next: Raise pg4, try again with RF |
| Dec 2 2009 02:00:50:623PM | 1091202021 | Steve Wolfe | Shot#21: Raise pg4 from 53 to 58, Argon puff to 100msec add second puff at 1sec try again with RF Still bad runaways, but plasma runs full length, got RF steps as programmed this time. Steps in density are bigger, last step goes up to 8e19 and stays, no pumpout, gas is off; big dalpha spike at that rf step. Next: repeat, see if last step comes down; raise pg4 again |
| Dec 2 2009 02:08:27:000PM | 1091202022 | Steve Wolfe | Shot#22: Raise pg4 from 58 to 64msec, No other PCS changes Next shot move on regardless of this result. Early disruption .35sec Next: raise Ip to 1MA, raise OH current limits to 35ka |
| Dec 2 2009 02:25:07:873PM | 1091202023 | Steve Wolfe | Shot#23: raise Ip to 1MA, raise OH current limits to 35ka leave pg4 at 64msec, put b21_proj target to 1e-4 at 0.2sec, decrease to zero by .6sec (previous shot did have early locked mode) Result: early disruption, 0.6sec. Small runaways 1.5e12 range locked mode at 0.42sec or so. Died just after LBO injection Next: keep b21_proj target at 1e-4 longer, drop to zero at 1sec; raise early nl04 target |
| Dec 2 2009 02:35:10:950PM | 1091202024 | Steve Wolfe | Shot#24: keep b21_proj target at 1e-4 flat to .54, drop to zero at 1sec; raise early nl04 target to .6 at .2sec (No overshoot yet) Still leave pg4 alone, hope it can handle a 1MA disruption Note that whatever the locked mode problem is, it does not seem to correlate with runaways. Result: fizzle, I guess it couldn't handle the disruption |
| Dec 2 2009 02:52:40:407PM | 1091202025 | Steve Wolfe | Shot#25: drop pg4 from 64 to 60msec, raise rcur offset from 2000 to 2500 raise pg3 puff in seg1 Relative to #23: keep b21_proj target at 1e-4 flat to .54, drop to zero at 1sec; raised early nl04 target to .6 at .2sec (No overshoot yet) Result: plasma into rampdown, no rf to speak of; problem with RF waveform generator (DTACQ module). No runaways, No locked mode; maybe a shortone at 0.4 to 0.5sec? S.T. are distorted, but present. That seems to be when it diverts. Next: repeat, hope for RF and no return of lm |
| Dec 2 2009 03:02:50:140PM | 1091202026 | Steve Wolfe | Shot#26: Add 20msec puff on pg3 from .35 to .5sec plasma into rampdown, got rf, had a problem in current rise, but survived HV tripped on HIREX_JR, probably repeat |
| Dec 2 2009 03:15:12:483PM | 1091202027 | Steve Wolfe | Shot#27: repeat for HR-JR data, no pcs or rf changes plasma full length, runaways are back, rf looks ok small trip at end Next: 1.2MA and try to get rid of runaways again |
| Dec 2 2009 03:29:45:407PM | 1091202028 | Steve Wolfe | Shot#28:Ip to 1.2MA, pg4 from 60 to 66msec On NL04, [P,D,I] from [9,6,0] to [5,6,2] to try to reduce oscillation (start Igain at .25sec) Result: Runaways, early disruption 0.12sec, something falls in at 50msec Next: tweak rcur? |
| Dec 2 2009 03:43:35:797PM | 1091202029 | Steve Wolfe | Shot#29: rcur @[.02,.05,.096] from [.63,.64,.64859] to [.6,.61,.64] Relative to #27: Ip to 1.2MA, pg4 from 60 to 66msec On NL04, [P,D,I] from [9,6,0] to [5,6,2] to try to reduce oscillation (start Igain at .25sec) cryopump bouncing around before shot, probably not going to hold Result: fizzle. Pressure was on the e-6 scale at pulse, 0.16mTorr at t=0 Next: try again |
| Dec 2 2009 03:58:10:373PM | 1091202030 | Steve Wolfe | Shot#30: try again, with cryo. Relative to #29: rcur @[.02,.05,.096] from [.63,.64,.64859] to [.6,.61,.64] Relative to #27: Ip to 1.2MA, pg4 from 60 to 66msec On NL04, [P,D,I] from [9,6,0] to [5,6,2] to try to reduce oscillation (start Igain at .25sec) plasma into rampdown (barely, 1.6), no runaways, unfortunately also no rf Density looks good, current could rise a little faster I think, maybe bring gain earlier? Power room access for RF |
| Dec 2 2009 04:13:13:720PM | 1091202031 | Steve Wolfe | Shot#31: tweak ip waveform before 0.5sec, pg4 from 66 to 60msec (disrupted last shot) Result: fizzle, didn't drop it enough! Next: pg4 to 57 and watch the runaways come back |
| Dec 2 2009 04:27:06:797PM | 1091202032 | Steve Wolfe | Shot#32: pg4 from 60 to 57msec relative to #30: tweak ip waveform before 0.5sec, Result: plasma to rampdown, did get rf, tripped out hirex-jr Some faulting on rf, looks like I-mode ELMs density still has oscillations early. Next: nl04 to 0.9, Ip to 0.6 |
| Dec 2 2009 04:46:12:810PM | 1091202033 | Steve Wolfe | Shot#33: Nl04 to 0.9e20, Ip to 0.6MA pg4 from 57 to 51msec Delay for cell entry to turn on ion gauge, PLC control is not working plasma into rampdown, marfes early, rf faulting on D and E, J ok. Will need to re-do this one, I should play with the gas some more to get rid of marfes. |
| Dec 2 2009 04:57:10:640PM | 1091202034 | Steve Wolfe | Shot#34: Tweak nl04 waveform, add pg3 feedforward at 20V from 0.35sec to 1.5 NL04 gain to 5 straight across (lose early point at 9.) pg4 from 51 to 55msec Result: plasma with marfe (or is it marfe with plasma) No runaways, rf not good, E faulting badly. Next: repeat this one, with better rf and still trying to reduce the marfe |
| Dec 2 2009 05:07:08:610PM | 1091202034 | Steve Wolfe | Shot#35: Tweak nl04 waveform again, P gain on nl04 from 5 to 3. leave pg4 at 55ms Got an ACK failure at completion of INIT, couldn't go to CHECK Do a no power END OF RUN |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:02:02:800AM | Plasma | Ok | |
| 2 | 09:16:37:190AM | Plasma | Ok | |
| 3 | 09:29:12:347AM | Plasma | Ok | |
| 4 | 09:41:58:627AM | Plasma | Ok | |
| 5 | 09:54:45:033AM | Plasma | Ok | |
| 6 | 10:07:24:727AM | Plasma | Bad | IGOR Failed in INIT |
| 7 | 10:22:40:547AM | Plasma | Ok | |
| 8 | 10:41:50:327AM | Plasma | Ok | |
| 9 | 10:54:27:390AM | Plasma | Ok | |
| 10 | 11:07:01:640AM | Plasma | Ok | |
| 11 | 11:19:44:343AM | Plasma | Ok | |
| 12 | 11:40:11:360AM | Plasma | Ok | |
| 13 | 11:53:47:030AM | Plasma | Ok | |
| 14 | 12:15:20:670PM | Plasma | Ok | |
| 15 | 12:28:06:357PM | Plasma | Ok | |
| 16 | 12:41:14:047PM | Plasma | Ok | |
| 17 | 12:55:09:937PM | Plasma | Ok | |
| 18 | 01:11:34:890PM | Plasma | Ok | |
| 19 | 01:24:23:687PM | Plasma | Ok | |
| 20 | 01:37:21:750PM | Plasma | Ok | |
| 21 | 01:52:19:763PM | Plasma | Ok | |
| 22 | 02:05:11:030PM | Plasma | Ok | |
| 23 | 02:17:53:577PM | Plasma | Ok | |
| 24 | 02:30:51:860PM | Plasma | Ok | |
| 25 | 02:43:45:420PM | Plasma | Ok | |
| 26 | 02:56:43:797PM | Plasma | Ok | |
| 27 | 03:10:52:470PM | Plasma | Ok | |
| 28 | 03:23:40:953PM | Plasma | Ok | |
| 29 | 03:39:15:390PM | Plasma | Ok | |
| 30 | 03:52:17:983PM | Plasma | Ok | |
| 31 | 04:08:03:187PM | Plasma | Ok | |
| 32 | 04:21:00:093PM | Plasma | Ok | |
| 33 | 04:38:23:093PM | Plasma | Ok | |
| 34 | 04:51:10:030PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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