| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Chuck Kessel |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Gary Dekow,Sam Pierson,Ed Fitzgerald |
| Engineering Operator Run Comment |
| MP 522 lower Ip Long Pulse L & H Mode Advanced Scenarios |
| Session Leader Plans |
| Entered: Jan 18 2008 08:03:02:537AM |
| Author: Chuck Kessel |
| MP522
4.1 Machine and Plasma Parameters Give values or range for: Toroidal Field: 5.4 T for ICRF Plasma Current: 0.45 MA Working Gas Species: D, H-minority. Density: Target 5e19 m-2 (cryopump on). Equilibrium configuration (if possible, refer to database equilibria): slow Ip ramp discharges 1070712016 at Ip = 450 kA listed below 4.2 Auxiliary Systems ICRF Power, pulse length, phasing: J-port essential, 1.0-2.0 MW. D and/or E desirable, 1 MW. LHCD Power, pulse length, phasing: have LH fully retracted for beginning of day, on notice for later in day after 1pm: 0.5-1.0 MW, variable phase (probably 90 deg), longest pulse available. Pellet Injection (species): no Impurity blow-off injection: no Diagnostic Neutral Beam: Highly desirable Special gas puffing: NINJA (with D2) should be available. Non-axisymmetric Coils (Connections, Current); Yes; optimized to reduce locked modes. Other: 4.3 Diagnostics List required diagnostics, and any special setup or configuration, e.g. non-standard digitization rate. Essential: Thomson, Magnetics, Hard x-rays, ECE, TCI, probes in LH grill. Desirable: MSE, CXRS, SOL probes. The run plan is for 1-2 run days targeting Ip (450 kA) . First the Ip ramp should be improved, H-mode access during the rampup should be attempted, and then a sequence of ramp rate, power, and timing scans. Correct early transient in Ip ramp after crowbar to avoid Ip oscillation and high li associated with it 1) start with discharge 1070712016 ohmic 450 kA discharge (target density programming was 5e19, start with this) 2) begin by adjusting Ip request following crowbar, for example since Ip reaches 200-225 kA at 40 ms, include points at t = 75 ms requesting 250 kA, t = 125 ms requesting 280 kA, and t = 500 ms requesting 450 kA 3) adjust the location in time and/or magnitude of requested Ip points to smooth Ip trajectory 4) adjust feedback gains to smooth Ip trajectory Attempt to produce H-modes in the Ip rampup by using a flattening of Ip(t) over approximately 20 ms and simultaneous injection of ICRF power 1) utilizing a discharge from the above shots 2) place flat spot in Ip ramp at 200 ms, 300 ms, and 400 ms, lasting about 20 ms 3) inject 1.0, 2.0, and 3.0 MW of ICRF power at the beginning of the flat spot in Ip trajectory 4) possibly adjust the density request to help H-mode formation (density may be below minimum for H-mode) 5) inject the power continuously and also in a blip over the flattop time 6) adjust the flat spot Ip time between 15-35 ms This is probably on a 2nd day, but if good progress on the above. Start with established discharges from smoothed out Ip trajectory and/or H-mode in rampup above, reaching 450 kA in 500 ms. 1000 ms rampup can be generated for those cases. 1) 500 ms rampup to 450 kA (7 shots) a. ICRF only, 2.0-3.0 MW at 500 ms b. ICRF only, 1.0 MW at 200 ms c. ICRF only, 2.0 MW at 200 ms d. ICRF only, 3.0 MW at 200 ms e. ICRF only, H-mode in ramp, 1.0-3.0 MW, at 200, 300, 400 ms (this may be accomplished in H-mode in ramp development session) 2) 500 ms rampup to 450 kA (3 shots) a. LH only, (maximum available) 0.5-1.0 MW at 200 ms b. Attempt longest LH pulses available 3) 500 ms rampup to 450 kA (7 shots) a. ICRF 1.0 MW at 200 ms, LH 0.5-1.0 MW at 200 ms b. ICRF 2.0 MW at 200 ms, LH 0.5-1.0 MW at 200 ms c. ICRF 3.0 MW at 200 ms, LH 0.5-1.0 MW at 200 ms d. ICRF 1.0-3.0 MW, H-mode in ramp at 200, 300 and 400 ms, LH 0.5-1.0 MW at 200 ms 4) 1000 ms rampup to 450 kA (8 shots) a. repeat best highest power ICRF and earliest injection cases from 500 ms ramp b. repeat best H-mode in ramp at 200, 300 and 400 ms, ICRF only from 500 ms ramp c. examine LH only case, inject at 200 ms d. repeat best high power ICRF and earliest injection cases from 500 ms ramp with LH injection at 200 ms e. repeat best from H-mode in ramp at 200, 300, and 400 ms, ICRF and LH |
| Physics Operators Plans |
| Entered: Jan 17 2008 05:00:04:307PM |
| Author: Steve Wolfe |
|
----------------- Engineering Setup ----------------- Run begins at 09:00 and ends at 17:00 Power systems as on: 1070712016 NOTE: Non-standard crowbar times Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid Enabled Gas setup: Fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid DISABLED (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill NINJA with 10 psi D2 DISABLED Enable gatevalves and shutters: ECE, VUV, DNB, Z-bolo Torvac gatevalve toggle (yes/no): yes, 300sec, if RGA is working use whatever bypass setting Irby has been requesting. Boronization(yes/no): no Overnight ECDC (yes/no): yes ICRF(yes/no): yes LH(yes/no): perhaps later in the day, start day with launcher fully retracted. We should know if we are going to need LH between by 1PM or so. DNB(yes/no): yes Cryopump (yes/no): yes, requested for first shot and continuing until we change our minds Vessel temperature: 35/35/35 ------------------------------ ECDC Parameters (if requested) ------------------------------ gas and pressure: D2 at 2e-4 Torr sweep: 44/45/103 cm scan: 20/120 s Physop plan: ------------- Load seg 1 and 2 from 1070712016 (slow startup, 450kA@0.5sec, ip gain on in seg1). Recalculate mag predictors in seg1 and 2, change Br0 and RCUR as on recent successful shots. Leave target nl04=5e19. A. Ohmic setup shots 1. Leave target nl04=5e19. Run one shot to verify startup, rampup, divertor time, since predictors with new flux loops may be a bit different. Note the target shot diverts at ~.17 to .18sec, which is ok. 2. Tweak current rise shape to match smoothly onto trajectory at crowbar time (40ms): 225 kA at 40 ms, 250kA at t = 75 ms, 280kA at 125ms, and 450kA at t = 500 ms. Copy into both seg1 and 2. 3. Tweak Ip trajectory and gains to get smoothly rising Ip trajectory, trying to avoid MHD, rising li, etc. May need to play with seg1 feedforward voltages and gas puff as well. B. Go for H-mode in current rise (ICRF only) This sequence differs some from sl's run plan, and may be changed again 1. a) Try 2-3MW (max avail) at 200ms with discharge from A.3 b) If no H-mode, try putting a 20ms flat spot at 200ms, turn on max avail ICRF just before flat spot c) Try gas tweaks, different density to try to get H-mode at 200ms d) try adjusting duration of flat spot 15< dt < 35ms 2. In succesive discharges, try to make H-modes at 300ms, and 400ms; use whatever worked at 200ms, or if nothing did then try again. 3. If H-modes are obtained, reduce power during flat spot: 3, 2, 1MW until we lose it? MAybe skip this. 4. Inject power above threshold only during the flat spot (or until L-H?) and then reduce power for rest of current rise (called blip in sl-plan). The idea is to try to get H-mode to stick around through start of flattop. C. ICRF power/timing scan into 500ms rampup to 450kA 1. ICRF at 2-3MW at t=500ms (SOF) 2. ICRF at 1 MW @200 ms (if we didn't do this in B.3?) 3. " 2 MW " " 4. " at 3 MW " (I think we must have done this above?) 5. ICRF with H-mode in ramp, starting at 200ms, 300ms, 400ms (Is this same as done in B?) D. LH Current drive in rampup (ICRF OFF) If we get this far, cell access to move launcher to 1.5mm (or maybe 2.5mm), turn on klystrons 1. LH at max available (0.5 -1.0 MW) starting at 0.2sec 2. Extend LH pulses to max available (0.5sec probably) E. Try combining ICRF and LH. Stop when the launcher starts to glow 1. ICRF 1MW at 200ms; LH 0.5-1MW @200ms 2. ICRF 2MW at 200ms; LH 0.5-1MW @200ms 3. ICRF 3MW at 200ms; LH 0.5-1MW @300ms 4. ICRF 1-3MW, H-mode in ramp at 200,300, and 400ms, LH=0.5-1MW at 200ms F. Change to 1000ms rampup to 450kA . We're not going to get to this unless we punt over half of the previous steps, but since he wrote it. 1. Repeat best highest power ICRF and earliest ICRF injection cases from C 2. repeat best H-mode in ramp at 200ms, 300ms, and 400ms from C 3. LH only case at 200ms; note that the LH probably can't stay on to 1sec 4. repeat best ICRF plus LH case from C 5. repeat best H-mode in ramp case with LH from C |
| Session Leader Summaries |
| Entered: Jan 19 2008 10:23:17:520AM |
| Author: Chuck Kessel |
| MP522 Low Ip and Lower Ip Ramp Rate
The first 2 tasks in the MP were accomplished; smoothing out of the Ip rampup trajectory and obtaining H-modes in the current rampup. The flattop plasma current was 450 kA and the rampup time was 500 ms for all discharges. The toroidal field was 5.4 T and ICRF heating was applied up to 3.5 MW. The plasmas were all LSN configurations. The Ip trajectory was re-programmed to transition smoothly from the crowbar Ip value (about 200 kA at 40 ms) to a slower Ip ramp reaching 450 kA by 500 ms. This was accomplished by shot 002. H-modes were attempted at 200 ms to begin with. These plasmas all divert at approximately 180 ms. The original density programming for these 450 kA discharges (from the 2007 campaign) was about 4e19, and 2 MW of ICRF was injected at 200 ms in order to try and induce an H-mode, but no H-modes appeared. The density was raised to 6e19 and a lot of H-mode onsets appeared with drops back to L-mode. By shot 006 1 MW was injected at 150 ms, and 2.5 MW was injected at 200 ms, with n about 5e19. This generated an H-mode at 250 ms lasting until 400 ms. There were some issues with MARFE-like events, however, the discharges seemed to recover and go on to produce H-modes. After attempts at lowering the density and raising the ICRF power, we returned to conditions from 006 in shot number 010. Then gas was increased in shots 011 and 012 at 230 ms with 1 to 2.5 MW injection for 011 and 2 to 2.5 MW injection for 012, and we got a lot of H-modes with the radiated power remaining lower. In shot 013 we tried the introduction of a flat spot in the Ip(t) and largely reproduced shot 012. Variations of the density timing and increasing injected power did not improve the results. So in shot 018 we moved the H-mode onset time to 300 ms, and by 019 we got an H-mode at 310 ms which lasted to 480 ms, with radiated power terminating the H-mode. In 023 we obtained an H-mode onset at 350 ms and lasting to 610 ms. We then moved the ICRF on time to 250 ms in shot 025 and got an H-mode, and in 029 we requested a slow density ramp after 200 ms and got 2 good long H-mode periods. In shot 031 we lowered the density request to force the plasma to stay in L-mode to provide a reference discharge. We then returned to attempting H-modes at 200 ms, by injecting 1 MW at 150 ms and 2.5 MW at 200 ms, which gave small H-modes at 300 ms and stronger H-modes during 400-500 ms. This was tried again by injecting 3.0 MW from 150 ms onward, and yielded weaker H-mode onsets after 200 ms, with a long H-mode at 400 ms. Overall the run day was very productive. The Ip trajectory was improved, and can easily be extended to 600 kA discharges. It was shown that H-modes can be produced in the rampup, primarily with sufficiently high density and 2-3 MW of injected power. The H-modes produced near 200 ms were genrally weak and dithery. The earliest substantial H-mode was about 250 ms. The H-modes were ELM-free, and often suffered radiative back transition to L-mode. Although some has reduced radiation and lasted for over 250 ms. In most discharges the H to L back transition was often followed by a re-entry to H-mode, and in some cases this oscillation in and out of H-mode was fast. It appeared that the slow Ip ramp was adequate to allow H-modes, and the flat spot used by other tokamak was not necessary, or at least did not change the result. We did not examine this in detail (ie longer flat spot times, shifting flat spot, etc.) since we were getting H-modes without it. The earliest H-mode attempts at 200 ms did appear to delay sawteeth and/or change their character. A cursory look at the temperature profiles did show that the longer H-modes had good pedestal temperatures and were steady, in spite of being ELM-free. Since there was not a recent boronization the H-mode quality and sustainment was not the best, and it is planned that these H-mode onsets can be used in AT discharge development to control q/j profile in the rampup. More detailed examination will focus on systematic changes in li, loop voltage, stored energy, etc. |
| Physics Operator Summaries |
| Entered: Jan 19 2008 02:26:37:707PM |
| Author: Steve Wolfe |
PhysOp summary for Friday, Jan 18, 2008
MP#522 Lower lp Long Pulse L-Mode and H-Mode Advanced Scenarios
SL: Kessel (remote from PPPL) and Hubbard
PO: wolfe
EO: Dekow, Pierson, Fitzgerald
The goals for this run were to smooth out the start of the 450kA
shot with SOF at 0.5sec that was developed on 1070712016, and use
it as a target for systematic early ICRF heating, trying to get
early h-modes lasting into the flattop to modify the current penetration
and get enhanced bootstrap fractions. The optimistic plan also had
shots with LHCD in the rise, and combined LH and ICRF, but we didn't
really expect to get that far, and we didn't.
The run got off to a pretty good start, aside from some snafu's with
the polycom communications. I decided to start right up with the
reprogrammed Ip waveform, rather than re-run the shot from 1070712,
and it pretty much just worked. The rise probably could have been
made even smoother by increasing the Voh1 at the crowbar time
of .04sec, but seemed good enough without it.
It took several shots to get the runaways down, but we started with early
rf on shot#3, and proceeded to try to get early H-modes.
We did get short H-modes with the rf starting at .2sec, but not well-
sustained. We spent a lot of time tweaking density, trying the flatspot
trick, bringing the rf on earlier to kill an early marfe around diversion
time. Shot #12 may have been the best example in this set. On some shots
we had early sawteeth, starting by .17sec, on others they were delayed
to .4sec. EFIT was getting 1.02>q0>.98, and may have been right.
During this period, as we raised the power we started getting disruptions
around 0.7 to 1sec, which seemed to be associated with tiles on bottom
corner of J-port antenna lighting up. Turning off J at 0.7sec (shot#17)
seemed to cure this, which was ok since we were mainly concerned with
the current rise into flattop starting at 0.5sec. We had no H-modes that
lasted as long into flattop as 0.7sec anyway.
On shot#18 we gave up on the 200ms point and moved the start of the
rf to 0.3sec, which gave better results for turning on an H-mode that
stayed on into flattop. A good example is 23. The runaways came back,
and I started raising the prepuff, eventually getting up to 74ms,
while also making some field tweaks to try to get rid of them. After a
couple more of these, SL decided to try an L-mode comparison, at lower
density (below the threshold minimum), and shot#31 was a reload of
#25 with the density program reduced to 4e19.
We then went back to the early rf case, with shots 32 having rf
start at .15sec, with density program as on shot#12. Shot#34 at 3MW
and slightly higher density, 6e19 at .2sec, succeeded in getting early
h-modes that ratcheted the density up until a sustained h-mode beginning
around .38sec lasted well into the flattop.
As has been common in recent weeks, fizzles got much more frequent in the
second half of the run. We had one fizzle (#8) in the first 21 shots,
and 6 fizzles in the next 13. After two in a row (27,28) I reloaded from
shot 16, but still got two more before the end of the day; while earlier
I had been raising the fill, it became necessary to decrease it further
until for shot#34 it was back down to 45msec.
The cryopump ran pretty well, with only 2 of the fizzles (22 and 24)
attributable to burps before pulse. Not sure how much it did for the
plasma though. We had no trouble getting down to low density for the
L-mode cases at the end of the run, but may not have in any case. The
main density control issue was marfing during the long Ip ramp as we
tried to increase the density. This was partially cured by turning
on low levels (1MW) ICRF starting at .15sec.
Note that the startup segment 1's from today are designed to be run
with oh crowbar at 0.04sec, and EF1 crowbar at 0.09sec. To avoid having
this startup inadvertently used next week, I have reloaded shot#1080108002
from the last post-boronization run, since similar shots are planned for
Tuesday.
Scorecard:
Duds and no power shots: 0
Fizzles 7
Plasmas 27
======== ==
Shots 34
|
| Session Leader Comments | |||
| Jan 18 2008 09:58:41:030AM | 1080118004 | Chuck Kessel | Ip early phase cleaned up quickly in 001 and 002, runaways improved
2MW ICRF at 200 ms, no flat spot 003, n about 0.4e20 higher density, 2.0 MW ICRF, at 200 ms, lots of H-mode attempts and drop outs 004 |
| Jan 18 2008 10:27:15:187AM | 1080118006 | Chuck Kessel | lower density 0.5e20, 2.5 MW at 200 ms - 005
1 MW ICRF early at 150 ms to deal with MARFEy thing, 2.5 MW at 200 ms, n = 0.5e20 great Ip(t) trajectory, H-mode at 250 ms and ends at 400 ms - 006 |
| Jan 18 2008 11:22:55:280AM | 1080118010 | Chuck Kessel | try to repeat 006, good full discharge
ICRF good and clean few H-mode attempts in ramp |
| Jan 18 2008 01:21:48:780PM | 1080118019 | Chuck Kessel | trying H-mode at 300 ms now
got density a little higher (than 018) and RF timed right, got H-mode at about 310 ms, drops out at 480 ms due to radiated power |
| Physics Operator Comments | |||
| Jan 17 2008 06:45:39:887PM | Steve Wolfe |
Getting a head start on setting up for tomorrow's run,
just in case the weather is worse than predicted.
Import seg 1 and 2 from 1070712016
This is after f10 failed, before f19 failed. I'll recalc predictors
Seg1: call wires 1-4,6,7
Rcur offset=1300. Use this instead of 1000 being used recently
because I think Bz should rise faster
Br_0 offset=-.003; change to 0.
Seg2: call wires 1-8, 10
Seg3: left over from today, never updated (and used!)
Go ahead and call 1-8, so it's up to date even though
it will never be used again
Seg4: Like seg3, still has old predictors. Update 1-8.
Turn seg3 off, seg2 on
In seg1, change pg4 from 20ms to 40ms for cryopump
This one seems to have amd signal in seg1 v17. Zero it.
I hadn't actually loaded the seg2 from 1070712016. Do it now
and recalculate wires 1-8; change title to "0.45MA ..."
This one also has amhd waveform. Zero it
Do a build_all, just to check. Now load it.
Load at 17-Jan-2008 18:35:37.00
Open tree /home/wolfe/pcs_scratch -1
Open tree done
Now just to be paranoid, also save it in pcs_scratch as pcs_1080118000
OOPs. I saved as 001 not 000; do it again.
copying /home/wolfe/pcs_scratch/pcs_model.tree to pcs_scratch/pcs_1080118000.tree
copying /home/wolfe/pcs_scratch/pcs_model.characteristics to pcs_scratch/pcs_1080118000.characteristics
copying /home/wolfe/pcs_scratch/pcs_model.datafile to pcs_scratch/pcs_1080118000.datafile
looking for.../home/wolfe/pcs_scratch/dpcs_model
NUM LONG = 3
copying /home/wolfe/pcs_scratch/dpcs_model.tree to pcs_scratch/dpcs_1080118000.tree
copying /home/wolfe/pcs_scratch/dpcs_model.characteristics to pcs_scratch/dpcs_1080118000.characteristics
copying /home/wolfe/pcs_scratch/dpcs_model.datafile to pcs_scratch/dpcs_1080118000.datafile
Open tree /home/wolfe/pcs_scratch -1
Open tree done
OK, leave it logged in
| |
| Jan 18 2008 07:31:46:860AM | Steve Wolfe |
Having thought about it some more, there seems little point
in re-running the program of 1070712016 as the first shot. If
there are adjustments to be made they will be in the shape, not
the current waveform. May as well go ahead and re-program the
current as called for in A.2, and go from there. Note that the
programming I did last night is in pcs_scratch:*pcs_1080118000
if I need to load it for some reason.
In seg2 (start=.08):
Change Ip waveform- [-4.703,-225,-280,-450]e3
at [.040, .075,.125,.500]
Copy to seg 1 and apply both places.
Note gains in seg1 are [1,4] at [.04,.06]
seg2 [4,8,9] at [.002,.1,.65]
leave these for now. Probably will want to increase initial seg 1 gain,
maybe values at .06 and .08 as well.
Load it.
Load at 18-Jan-2008 07:31:28.00
Open tree /home/wolfe/pcs_scratch -1
Open tree done
| |
| Jan 18 2008 09:08:10:703AM | Steve Wolfe | Shot#1: Chuck = please call 617-253-5347 | |
| Jan 18 2008 09:17:45:403AM | 1080118001 | Steve Wolfe | Shot#1: plasma, some runaways on startup positive di/dt everywhere, looks good. Diverts at 180 or so. Aside from the runaways pretty good to me Next: raise pg4 from 40 to 45ms |
| Jan 18 2008 09:24:12:847AM | 1080118002 | Steve Wolfe | Shot#2: raise pg4 from 40 to 45ms plasma, fewer runaways, one dump at .05sec, small. Startup still a little bouncy. I could raise gas some more or rcur offset, which got left at 0 instead of 1000! Do that. Next: seg1 rcur offset from 0 to 1000 |
| Jan 18 2008 09:38:42:113AM | 1080118003 | Steve Wolfe | Shot#3: seg1 rcur offset from 0 to 1000 Go for rf at 0.2sec, 2MW runaways early again, then disrupts at .8sec Bad bounce on the startup, despite the higher rcur, not what I expected. RF got 2MW in dropping to 1.5 at .31sec (D drops) Next: try raising density at 0.2sec from 4 to 6e19. raise pg4 to 48ms, risk fizz |
| Jan 18 2008 09:42:45:417AM | 1080118003 | Steve Wolfe | Shot#4: try raising density at 0.2sec from 4 to 6e19. start nl04 feedback at 0.8 instead of 0.88 raise pg4 to 48ms, risk fizz Leaving rf request the same at 2MW |
| Jan 18 2008 09:53:42:257AM | 1080118004 | Steve Wolfe | Shot#4: try raising density at 0.2sec from 4 to 6e19. start nl04 feedback at 0.8 instead of 0.88 raise pg4 to 48ms, risk fizz Leaving rf request the same at 2MW Load at 18-Jan-2008 09:43:15.00 Could have used a little more rcur offset on 3, maybe change on 5 (too late now) Plasma, full length, some h-modes, not sustained, but it's a start. Still getting a bounce and runaways at startup, then maybe a marfe starting around .15, ending at 0.2s when rf comes on, There was an accidental flatspot on the ip, due to the marfe. Maybe not an h-mode at 0.2, temperature ped doesn't respond right. Still trying to deal with non-thermals, try rcur offset to 1500 drop nl04 request a bit. |
| Jan 18 2008 09:57:21:760AM | 1080118004 | Steve Wolfe | Shot#5:Still trying to deal with non-thermals, try rcur offset to 1500 drop nl04 request at 0.2 to 5e19, rising to 6e19 at 0.3 raise rf request to 2.5MW |
| Jan 18 2008 10:10:55:853AM | 1080118005 | Steve Wolfe | Shot#5:Still trying to deal with non-thermals, try rcur offset to 1500 drop nl04 request at 0.2 to 5e19, rising to 6e19 at 0.3 raise rf request to 2.5MW still with runaways, and a disruption at .76sec H-mode not there till 0.3 or so The marfe seems to happen as it goes diverted, which also is counterintuitive. Next: raise pg4 from 48 to 55ms move 1MW rf to .15sec, recalculate nl04 predictor, just in case; it looks like we're overshooting the density before gas turns off |
| Jan 18 2008 10:21:56:850AM | 1080118006 | Steve Wolfe | Shot#6: raise pg4 from 48 to 55ms (pushing?) move 1MW rf to .15sec, to try to quench marfe recalculate nl04 predictor, just in case; it looks like we're overshooting the density before gas turns off Plasma, no runaways, rf clean, h-mode not until .259sec maybe gets an injection right then. Sawteeth delayed until 0.4sec or so, which is also when it drops out of h-mode. Next: decrease nl04 gain from 8 to 4 before .4 sec |
| Jan 18 2008 10:32:11:300AM | 1080118007 | Steve Wolfe | Shot#7: decrease nl04 gain from 8 to 4 before .4 sec raising rf power request from 2.5 to 3.5MW plasma, disrupts at 0.5sec, just into flattop No runaways, smooth startup, density is lower at 0.2sec, back down to 4e19, no h-mode. got rid of the marfe though. Next: put back some of nl04 gain |
| Jan 18 2008 10:51:08:103AM | 1080118008 | Steve Wolfe | Shot#8: nl04 gain from 4 to 6 before .4sec We should probably look at the flattop equilibrium re these disruptions, it's lighting up in lower divertor near the nose on 7. Too late now. fizzle. Actually, got to .05sec before it turns around and moves back in? No bounce. CIII and Dalpha light high; may have moved too far in. Next: try moving program rcur waveform at .05sec from .64 to .645 (move out faster; this may bring back the runaways) |
| Jan 18 2008 11:08:56:547AM | 1080118009 | Steve Wolfe | Shot#9: nl04 gain from 4 to 6 before .4sec try moving program rcur waveform at .05sec from .64 to .645 (move out faster; this may bring back the runaways). I've been getting an oscillation in the apparent rcur position, about 30msec period; lost this one on the inward swing. Maybe too little D gain? plasma, with H-modes, disrupts at 0.6sec. Rcur still swings in at 0.05sec, but makes it. Don't seem to have gotten the higher density at .2sec, on the plus side, we still aren't getting the marfe. Next: reload nl04 from shot 6 (higher gain) Decrease rf power to 2.5MW |
| Jan 18 2008 11:21:20:890AM | 1080118010 | Steve Wolfe | Shot#10: reload nl04 from shot 6 (higher gain) Decrease rf power to 2.5MW plasma,full length, with early h-modes. Also got a little higher density and a bit of marfe back. Very similar to #6. Next: increase nl04 program at 0.3 sec, trying to stay in H-mode |
| Jan 18 2008 11:33:09:277AM | 1080118011 | Steve Wolfe | Shot#11: increase nl04 program at 0.23 sec, ramping from 5 to 8 at 0.38sec, trying to stay in H-mode plasma with h-modes, still short at first. Sawteeth come in early during first rf pulse around .17sec Next: increase rf at .15sec from 1 to 2MW. |
| Jan 18 2008 11:42:52:477AM | 1080118012 | Steve Wolfe | Shot#12:increase rf at .15sec from 1 to 2MW. No pcs changes, if this gets rid of the marfe maybe increase density for next shot. Plasma. h-modes. target density did come up a little as marfe turns off. Still not sustaining the h-mode. Sawteeth not on until .4sec again. Next: try 20ms flatspot at 0.2sec |
| Jan 18 2008 11:58:12:790AM | 1080118013 | Steve Wolfe | Shot#13: try 20ms flatspot at 0.2sec, ip=313728 Also put rf back out to 1sec, looking at last H-mode Drop pg4 from 55 to 53ms, last shot started to move in plasma, with h-modes, disrupts at .81sec I can barely make out the flat spot, h-modes look similar to 12. |
| Jan 18 2008 12:11:28:900PM | 1080118014 | Steve Wolfe | Shot#14: Move rxl out between .27 and 0.6sec Incerase nl04 at 0.2sec from 5 to 6, and at .23 from 5 to 6.5e19 plasma to 1sec, but first h-mode is delayed next: drop the density at 0.2, and raise it later. |
| Jan 18 2008 12:20:54:170PM | 1080118015 | Steve Wolfe | Shot#15:drop the density to 4e19 at 0.2, and raise it after.23. leave ip flatspot at 0.2sec plasma, still disrupting at .8sec Almost the same as 14, no early H-modes. Density didn't really drop at 0.2sec, still at 5e19; I did load the change, it just overshot. |
| Jan 18 2008 12:37:10:230PM | 1080118016 | Steve Wolfe | Shot#16: reload from 1080118013, to see if it repeats. This one has nl04 at 5e19, at 0.2sec plasma, still disrupts at .75sec Still no h-mode at 0.2sec, so it is different from 13. No marfe on this one, 13 had a vestigial one. density is lower than on 13. Next: more power try to raise density |
| Jan 18 2008 12:51:26:230PM | 1080118017 | Steve Wolfe | Shot#17: more power (3MW), raise nl04 demand to 7e19 at 0.2sec Turn J off at 0.7sec, try to get rid of the disruption Plasma full length. marfe was back, density at 0.2sec is 6e19. Runaways came back, big bounce in startup. I was thinking of dropping pg4, looks like I need to increase it again. H-modes are delayed, nowhere near as good as 13. Amanda thinks there is actually an H-mode after the marfe extinguishes? There is an h->l at 0.278sec, she says. next: pg4 to 57ms, move start of rf to 2.5MW,6e19 |
| Jan 18 2008 01:01:14:180PM | 1080118018 | Steve Wolfe | Shot#18: pg4 to 57ms, move start of rf to 0.3sec, 2.5MW, nl04 to 6e19 at 0.3sec, then flat. Forgot to take out the current flat spot at 0.2sec plasma full length, rf came on at 0.2sec instead of 0.3, got 2.5MW Next: get the rf timing right, increase nl04 ramp to get to 0.6 at 0.25sec remove flatspot in Ip at 0.2sec |
| Jan 18 2008 01:16:32:570PM | 1080118019 | Steve Wolfe | Shot#19: pg4 to 57ms, move start of rf to 0.3sec, 2.5MW, nl04 to 6e19 at 0.25sec, then flat. remove flatspot in Ip at 0.2sec plasma, full length. Hmode at ~0.31, lasts to .48, elm free There is a big marfe just before the rf which complicates it a little. next: try starting 1MW of rf at 0.15sec, to get rid of both marfes |
| Jan 18 2008 01:29:00:570PM | 1080118020 | Steve Wolfe | Shot#20: try starting 1MW of rf at 0.15sec, to get rid of both marfes High power phase to 3MW No pcs changes, although I'm considering a tweak on the current just at .04s because it has a little flat spot again. Got runaways again, disrupted at 0.64sec, no marfe Density is only 5e19 at 0.3sec. H-modes???? Next: raise nl04 demand to 7e19, since it seems low but gas turns off. Also raise pg4 again |
| Jan 18 2008 01:46:28:873PM | 1080118021 | Steve Wolfe | Shot#21: raise nl04 demand to 7e19, since it seems low but gas turns off. Also raise pg4 from 57 to 60ms; notice that the initial bz0 has been low all day, maybe I should change ef4? too late now, do it next shot. Still some runaways, and a bounce; late breakdown, 9ms plasma full length, D comes in late; J drops out. next: raise pg4 again, drop ef4 |
| Jan 18 2008 02:13:11:200PM | 1080118022 | Steve Wolfe | Shot#22: ef4 from -1325 to -1350, pg4 from 60 to 65ms Steve will try to fix the rf Need a power room access. Meanwhile, I'm just noticing that the acoil isn't coming on until 1.3sec, claims the error has the wrong sign earlier. Not sure what's going on.Looks like the oh crossober is just that late. RF found nothing wrong. Josh has replaced the speaker and microphone, now we seem to remain in contact with Chuck. Seems the old black box was flakier than we knew. And it was a fizzle, probably the gas or ef4 change. Still a late breakdown, cryopump may have burped, pressure was up to 0.14mTorr, should have been 0.09mTorr. Next: just try again, with cryo working (I hope) |
| Jan 18 2008 02:28:14:857PM | 1080118023 | Steve Wolfe | Shot#23: ef4 from -1325 to -1350, pg4 from 60 to 65ms try again, with cryo working (I hope) plasma, still has early xrays, bounce H-mode starts at .36, lasts into flattop, off at 0.626 sawteeth start just before 0.3sec; J is a little ratty coming up. Best case of the day, so far. Next: Try to fix startup, move hipower rf to .25sec |
| Jan 18 2008 02:39:38:980PM | 1080118024 | Steve Wolfe | Shot#24: move hipower rf to .25sec, raise pg4 from 65 to 70ms!! Should give about 0.095mTorr Cryo burped. fizzle. Got .23mTorr instead, never had a chance broke down at .015sec Next: try again. |
| Jan 18 2008 02:54:13:153PM | 1080118025 | Steve Wolfe | Shot#25: move hipower rf to .25sec, raise pg4 from 65 to 70ms!! Should give about 0.095mTorr, maybe lose the runaways plasma, almost lost the runaways, still some small bounces couple of h-modes, the one that starts at .34 hangs on to .56sec, but early h-modes are short. Next: ramp density from 200ms to .5sec |
| Jan 18 2008 03:12:52:503PM | 1080118026 | Steve Wolfe | Shot#26: ramp density from 200ms to .5sec, request=[7,9]e19 raise rcur offset from 1500 to 2000 plasma, some runaways early, bounce No hmode, hardly any rf, D drops out immediately, J faulting after .3 Next: raise pg4 again, |
| Jan 18 2008 03:21:17:670PM | 1080118027 | Steve Wolfe | Shot#27: raise pg4 again, to 74ms fizzle, presure too high at .093mTorr Next: drop pg4 back to 70ms |
| Jan 18 2008 03:35:18:653PM | 1080118028 | Steve Wolfe | Shot#28: drop pg4 back from 74 to 70ms Keep rcur program at 0.63m to 18ms (was 10ms) drop br_0 from 0 to -.0002. Haven't had a runaway-free shot since I dropped EF4, maybe I should put it back but it sure looked high. Another fizzle, reload seg1 from shot#16 |
| Jan 18 2008 03:54:26:580PM | 1080118029 | Steve Wolfe | Shot#29: reload seg1 from shot#16 (53ms puff, rcur=1500,br=0,ef4=-1325) It will probably have runaways, but fields may be better and I've probably wandered too far. On the other hand, breakdown time is good on 28, just looks like maybe too much gas. Well, see what happens. plasma full length, no runaways, Amanda sees H-modes, not clear to me. This one has early sawteeth Next: import seg 2 from 25, lower density to 4e19 |
| Jan 18 2008 04:02:07:810PM | 1080118030 | Steve Wolfe | Shot#30: import seg 2 from #25, lower density to 4e19 from .2sec on Same rf waveform This is supposed to be an L-mode comparison. Fizzle. Now it seems to want lower fill Next: pg4 from 53ms to 48ms |
| Jan 18 2008 04:19:24:127PM | 1080118031 | Steve Wolfe | Shot#30: pg4 from 53ms to 48ms import seg 2 from #25, lower density to 4e19 from .2sec on Same rf waveform This is supposed to be an L-mode comparison. Some runaways early, one big bounce Got 3MW, L-mode, nl04~5e19 from .2 to .7, then drops. sawteeth are early. Next: rf high power 2.5MW start at 0.15sec, nl04 as on #12 |
| Jan 18 2008 04:38:53:837PM | 1080118032 | Steve Wolfe | Shot#32: pg4 from 48ms to 50ms import seg 2 from #12, start rf at .15sec, 2.5MW No runaways, no bounce plasma full length, extremely short early H-modes starting at .3, one longer around .4, diverts between 0.18 and .2sec next: raise nl04 from 5e19 to 6e19 at 0.2sec, rising to 8e19 at .38sec |
| Jan 18 2008 04:48:30:240PM | 1080118033 | Steve Wolfe | Shot#33: raise nl04 from 5e19 to 6e19 at 0.2sec, rising to 8e19 at .38sec No change to pg4 fizzle, knew I should have changed the gas, didn't know which way should have gone down. Breakdown looks slow, starts at 6ms on zmeter, but rise time is like 5ms Not sure what that means, but the plasma dies inward Next: pg4 from 50 to 45ms |
| Jan 18 2008 04:58:43:970PM | 1080118034 | Steve Wolfe | Shot#34: pg4 from 50 to 45ms; br0 from 0 to -.0002 raise nl04 from 5e19 to 6e19 at 0.2sec, rising to 8e19 at .38sec plasma with H-modes, no runaways, tiny little H-modes starting at 0.23sec building up densituy until it goes to a sustained h-mode from .38 to .72sec Some rf faulting on J Pretty good example. END OF RUN |
| Jan 18 2008 06:01:05:087PM | 1080118034 | Steve Wolfe | After the run, load from 1080108002, from post-boronization run, just to be sure that the startup on Tuesday doesn't get messed up, since the startups today need early crowbars. The JFT2-M shape in seg2 is what they will probably want to start with on Tuesday anyway, for the MP#484 run. Load at 18-Jan-2008 17:59:59.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:05:45:937AM | Plasma | Ok | |
| 2 | 09:18:40:640AM | Plasma | Ok | |
| 3 | 09:31:45:077AM | Plasma | Ok | |
| 4 | 09:44:27:590AM | Plasma | Ok | |
| 5 | 09:58:11:620AM | Plasma | Ok | |
| 6 | 10:11:49:513AM | Plasma | Ok | |
| 7 | 10:26:24:793AM | Plasma | Ok | |
| 8 | 10:41:35:470AM | Plasma | Ok | |
| 9 | 10:54:08:093AM | Plasma | Ok | |
| 10 | 11:11:08:783AM | Plasma | Ok | |
| 11 | 11:23:49:313AM | Plasma | Ok | |
| 12 | 11:36:58:283AM | Plasma | Ok | |
| 13 | 11:49:34:373AM | Plasma | Ok | |
| 14 | 12:04:02:237PM | Plasma | Ok | |
| 15 | 12:16:48:430PM | Plasma | Ok | |
| 16 | 12:29:09:897PM | Plasma | Ok | |
| 17 | 12:41:55:797PM | Plasma | Ok | |
| 18 | 12:55:04:487PM | Plasma | Ok | |
| 19 | 01:08:34:220PM | Plasma | Ok | |
| 20 | 01:21:16:140PM | Plasma | Ok | |
| 21 | 01:33:52:077PM | Plasma | Ok | |
| 22 | 02:08:10:117PM | Plasma | Ok | |
| 23 | 02:20:40:113PM | Plasma | Ok | |
| 24 | 02:33:09:300PM | Plasma | Ok | |
| 25 | 02:45:32:283PM | Plasma | Ok | |
| 26 | 03:02:34:833PM | Plasma | Ok | |
| 27 | 03:18:00:540PM | Plasma | Ok | |
| 28 | 03:31:40:463PM | Plasma | Ok | |
| 29 | 03:44:10:710PM | Plasma | Ok | |
| 30 | 03:58:00:697PM | Plasma | Ok | |
| 31 | 04:11:56:883PM | Plasma | Ok | |
| 32 | 04:28:31:763PM | Plasma | Ok | |
| 33 | 04:41:12:637PM | Plasma | Ok | |
| 34 | 04:54:02:103PM | Plasma | Ok | |
| System Availability | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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