| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Yuichi Takase |
| Physics operator(s): | Steve Horne |
| Engineering operator(s): | Frank Silva |
| Engineering Operator Run Comment |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:08:553PM |
| Author: To Be Determined |
| Run 930819 Physics Operator Summary. (Horne) Session Leader -- Y. Takase Engineer -- Frank Silva Last night, discharge cleaned in D. OPERATORS NOTE -- I loaded the "LABEL" node in the pulse_gas_* drawables with labels appropriate to this run. If you load one of these shots for a later run, you may need to change them. This was an RF run. Physics objective was to get repeatable plasmas in D2, or mostly D2. The first 9 shots were with H2 fill; 3-9 had D puff. Then we switched to D fill and D puff on B_top. It took several shots to evolve the gas valve programming (shots 10-17) with success, more or less, on shot 18. From then on the gas programming was adjusted gently shot by shot to improve the initial current rise; shot 23 looks about like a typical shot in H from yesterday. I was concerned that the plasma seemed nearly diverted onto the limiter near OH2; on shot 27 the OH2 voltage programming waws adjusted to fix that. There was no obvious change in plasma quality as a result. Shots 29 and 30 we programmed the plasma radial position to move out against the limiter to get a sweep of RF loading -- with predictable results. (Plasma died against the limiter, and the RF failed to fire.) A scatterplot of any later shot today against yesterday's run, shows no glaring differences. The only difficulty during the run was in developing a gas valve program for D which gives the same pressure evolution in the machine as we had in H. See the Session Leader's summary for the RF news. ================ Gas connections --- they WERE: PULSE_GAS_3 = A_SIDE (H2) PULSE_GAS_1 = B_SIDE_LOWER (Ar) PULSE_GAS_2 B_SIDE_UPPER (H2) For this run, they are: PULSE_GAS_3 = B_TOP (D2) PULSE_GAS_1 = B_SIDE_LOWER (Ar) PULSE_GAS_2 = B_SIDE_UPPER (H2) Shot 1 fill and puff from B side upper,1.2e-5. limiter at 93 cm. short, probably too much gas 2 reduce puff, fill = 1.e-5, ==>xrays. 3 add d2 puff move -2 cm down Still lots of hards got zcur=-1.5 cm 4 fill 1.3e-5 H more d2, earlier zcur=-.03 cm Got the zcur, but still lots of hards 5 same fill h2 puff from (.003,34) to (-.008,50) efc V to 750 (was 700) Good shot. Scatterplot shows that 1'st 4 shots had low gas. This shot nominal compared to yesterday. 6 Change d2 puff . (-.008,50) (+.1,50) (+.102,0) Good shot. Definite change in ratiomatic signal at 100 msec -- -5.0 last shot, -4.8 this shot. Density higher than nominal 7 Change d2 puff . (-.008,50) (+.2,50) (+.202,0) Drop h2 puff late in time. Died early, density increase at 250 msec. Gas or RF? 8 disable PG2, B side upper, h2. Change d2 puff a bit, A dud -- no flash. No obvious magnetics problem; gas a hair high on scatterplot. 9 Drop fill to 1.1e-5 (was 1.3). Adjust d2 programming -- 100 v 10 msec puffs at -.03 and zero, then maintainance. Hards again. scatterplot shows gas and density decrease (compared to yesterday) at 30 msec or so. 10 Switch fill to D2. Add D puff at -50 msec., 2 burps, then ramp. Fill at 1.1 e-5 in D, not H, so gauge factor difference makes it 1.4 or so. Still hards. 11 Add another d2 puff at -80 msec. Fill at 1.3e-5. Better, but not great -- like shots 3,4. First d2 puff is in at t=0. 12 More d2 early. Fizzle. Probably overshot with gas. 13 Shift d2 programming forward in time by 15 msec. This value based on getting 1.5e-5 on ratiomatic at breakdown. Fizzle -- probably not far enough. 14 move d2 programming 10 msec later. This should be close. good shot, but xrays again. 15 Increase gas with ramp -- (-.065,50), (-.04,55) and so forth. Fizzle. 16 Reduce d2 a bit. Better, but still a fizzle. 17 Take a divot out of gas at -40 msec. Fizzle, but better still. 18 Bigger divot. That did it. This was a change in gas programming at -50 msec!. First cmod shot in D2. 19 Repeat. Few hards, not as good current rise. Scatterplot shows faster initial density rise than yesterday. Density nice initially, then drops. 20 Increase size of divot in gas programming, raise maintainance level to fill in density. Poor current rise early. BZ looks too negative. 21 Add 40 A to ef4. Fix ef4 programming to be flat from -.5 sec. Better -- still not a nice current rise. 22 Less gas from about -50 msec on. Good shot, a few xray sparkles. Current rise from 30 msec on looks fine, but from 10-30 is low. 23 Increase the width of the divot -- both earlier and (a bit) later. Looks better -- best so far. Note that early gas was reduced but early density was higher. (around 30 msec or so.) 24 Raise maintance gas a bit for more density later. That worked but there's a peculiar density rise at .5 sec -- possibly due to RF or to vertical shift of plasma. 25 Delicate gas tweak early; move upward jog to .56 msec or so. Ok, a few xrays. Disrupts on the way down. 26 Add a pinch of gas early, drop it late. OK. 27 remove about 2000 A from the OH2 coils around 200-300 msec, to try to be more solidly limited. Earlier shots are nearly diverted, on the inner wall. Probably worked. 28 Gas twiddle, essentially a repeat. Loose plasma early, sharks in the water. 29 Less gas late to try to submerge the shark fin. Also, ramp the plasma out radially from (.2,.66) to (.3,.69), then back to (.4,.66) That worked, plasma died shortly after kissing the RF limiter. 30 repeat. |
| Entered: Jul 7 2004 03:49:08:570PM |
| Author: To Be Determined |
| Run Summary for 930819 ICRF coupling studies in D(H) plasma. Session Leader: Takase Physics Operator: Horne Engineering Operator: Silva Objective of today's run was to obtain loading data as functions of 1) H/D concentration ratio 2) Plasma-antenna distance 3) Plasma shape 4) Plasma density ECDC was done with deuterium this morning. We loaded 930818023 and evolved it into a plasma with fairly good match to the antenna and the limiter. We started with H fill and H puff, substituting D puff for H puff gradually, and eventually D fill and D puff. It took a while to set up the D plasma, trying to find a window between runaway shots and fizzles. (see physics operator's summary.) Antenna loading did not seem to change appreciably as the H/D ratio is changed, but we don't have a good way of measuring the H/D ratio at the moment. Catherine did see some thermonuclear neutrons today. We scanned the antenna position from 96cm to 91cm and the limiter position from 93cm to 90cm. On the last two shots (29 and 30) the plasma was shifted radially so that R_out(FFIT) varied from 84 to 90cm (the limiter was at 90cm and the antenna was at 91cm). However, because we did not have the time to retune after moving the antenna in (at the moment we need a few plasma shots to do this), rf faulted on high reflection. We did observe significant loading increase when the antenna was moved from 92cm to 91cm with the limiter placed at 90cm. Loading results: Initial analysis indicates that the loading is 4-6 Ohms when the antenna is 2cm behind the limiter, but 10-15 Ohms when it is 1cm behind the limiter. This is to be compared with the vacuum loading which is about 0.2 Ohm. This result is consistent with our predictions based on code modeling. We will be refining our determination of loading by making additional measurements (voltage probe array and antenna current probe) after the August break. Coupling results: We have successfully injected at least 1/4 MW (250 kW) into the plasma. At the moment we have an uncertainty in our power measurement which needs to be resolved during the August break. According to another measurement the power was 1/2 MW (500kW). We did see some signs of rf effects on soft X-rays, density, radiated power, and edge probes (and maybe others too). We also made an ICRF plasma after a disruption (it is most obvious on the vertically-viewing camera on F port, but also shows up on visible Brems, H alpha, antenna loading, and maybe interferometer. All diagnostitians are encouraged to look at your signals for rf effects and rf pick-up. Good shots to look at are shots 930819018 and 930819024. The rf power can be found in \rf::top.antenna.results:pwr_net (calibration needs to be resolved, and can be a factor of two lower than this signal indicates). According to this measurement, shot 024 had 500 kW leaving the antenna. So where did all that power go? Possibly in the edge plasma (there are modifications to the density, the floating potential, and maybe temperature), but no nasty impurity effects were observed. My personal feeling is that the antenna needs to be closer to the plasma. |
| Physics Operator Summaries |
| Session Leader Comments | |||
| Aug 19 1993 09:16:09:850AM | Yuichi Takase | ICRF coupling studies in D(H) plasma.
Session Leader: Takase Physics Operator: Horne Engineering Operator: Silva Objective for today's run is to obtain loading data as functions of 1) H/D concentration ratio 2) Plasma-antenna distance 3) Plasma shape 4) Plasma density 1) will only be qualitative since we don't have a good way of measuring the H/D ratio 2) we will spend some time on, since moving the antenna and changing the edge plasma will change tuning 3) and 4) will be done if time allows. R_limiter = 93cm R_antenna = 96cm for the first shot. But we will be moving them during the run. B top has D2 B side upper has H2 B side lower has Ar Start from 930818023 with some changes. | |
| Aug 19 1993 09:17:53:800AM | 930819001 | Yuichi Takase | Shot 01
H fill, H puff short plasma (disrupt at 0.18s) |
| Aug 19 1993 09:42:35:710AM | 930819002 | Yuichi Takase | Shot 002
H fill, H puff good plasma, tuning a little off |
| Aug 19 1993 09:55:57:990AM | 930819003 | Yuichi Takase | Shot 003
H fill, H puff and D puff good plasma, tuning a little better Rlim=93, Rant=95 |
| Aug 19 1993 10:07:01:980AM | 930819004 | Yuichi Takase | Shot 004
a little more D puff a little better tune Rlim=92.5, Rant=94.5 |
| Aug 19 1993 10:34:55:150AM | 930819005 | Yuichi Takase | Shot 005
good shot, a lot less HX Rlim=92, Rant=94 |
| Aug 19 1993 10:49:14:250AM | 930819006 | Yuichi Takase | Shot 006
good shot, nel=4 Rlim=91.5, Rant=93.5 |
| Aug 19 1993 11:00:09:430AM | 930819007 | Yuichi Takase | Shot 007
attempt to raise D disrupt at 0.36, too much gas Rlim=91, Rant=93 |
| Aug 19 1993 11:26:30:160AM | 930819008 | Yuichi Takase | Shot 008
dud, vacuum loading 0.2 Ohms starts faulting after 0.4sec power step-up Rlim=91, Rant=93 |
| Aug 19 1993 11:43:15:890AM | 930819009 | Yuichi Takase | Shot 009
runaway shot Rlim=91, Rant=93 |
| Aug 19 1993 12:50:56:950PM | 930819010 | Yuichi Takase | Shot 010
disrupt @ 0.26sec Rlim=91, Rant=93 |
| Aug 19 1993 12:52:25:510PM | 930819011 | Yuichi Takase | Shot 011
runaways, rf faulted at 0.3sec Rlim=91, Rant=93 |
| Aug 19 1993 12:52:54:020PM | 930819012 | Yuichi Takase | Shot 012
fizzle Rlim=91, Rant=93 |
| Aug 19 1993 12:53:05:590PM | 930819013 | Yuichi Takase | Shot 013
fizzle Rlim=91, Rant=93 |
| Aug 19 1993 12:59:01:800PM | 930819014 | Yuichi Takase | Shot 014
runaway shot, rf faulted at 0.23sec Rlim=91, Rant=93 |
| Aug 19 1993 01:19:27:820PM | 930819015 | Yuichi Takase | Shot 015
fizzle again Rlim=91, Rant=93 |
| Aug 19 1993 01:23:44:940PM | 930819016 | Yuichi Takase | Shot 016
fizzle again Rlim=92, Rant=94 |
| Aug 19 1993 01:42:32:450PM | 930819017 | Yuichi Takase | Shot 016
fizzle again, almost there Rlim=92, Rant=94 |
| Aug 19 1993 02:07:59:240PM | 930819019 | Yuichi Takase | Shot 018
good shot, a lot of rf Rlim=92, Rant=94 |
| Aug 19 1993 02:09:57:910PM | 930819019 | Yuichi Takase | Shot 018
good shot, good rf shot Rlim=92, Rant=94 |
| Aug 19 1993 02:10:48:430PM | 930819019 | Yuichi Takase | Shot 019
transmitter tripped Rlim=92, Rant=94 |
| Aug 19 1993 02:30:33:340PM | 930819020 | Yuichi Takase | Shot 020
disruptive plasma, rf faulted on minor disruption Rlim=92, Rant=94 |
| Aug 19 1993 03:17:00:520PM | 930819021 | Yuichi Takase | Shot 021
plasma disrupted at 0.3 Rlim=92, Rant=94 |
| Aug 19 1993 03:17:42:740PM | 930819022 | Yuichi Takase | Shot 022
good shot, but lots of rf interrupts Rlim=92, Rant=94 |
| Aug 19 1993 03:50:36:910PM | 930819023 | Yuichi Takase | Shot 023
good shot, but high rf reflection Rlim=92, Rant=94 |
| Aug 19 1993 03:52:54:760PM | 930819024 | Yuichi Takase | Shot 024
good tune, lots of rf power (1/4-1/2MW at the end) Rlim=92, Rant=94 |
| Aug 19 1993 04:09:23:280PM | 930819025 | Yuichi Takase | Shot 025
good shot, but rf faulted Rlim=91, Rant=93 |
| Aug 19 1993 05:10:22:550PM | 930819026 | Yuichi Takase | Shot 026
good shot, but rf faulted (mistuned) Rlim=91, Rant=93 |
| Aug 19 1993 05:26:49:210PM | 930819027 | Yuichi Takase | Shot 027
good shot, but rf faulted (mistuned) Rlim=91, Rant=93 |
| Aug 19 1993 05:28:22:730PM | 930819028 | Yuichi Takase | Shot 028
good shot, short rf pulse Rlim=91, Rant=92 |
| Aug 19 1993 05:30:04:200PM | 930819029 | Yuichi Takase | Shot 029
good shot (sweeping R_out to the limiter), disrupts after contacting limiter rf faulted Rlim=91, Rant=92 |
| Aug 19 1993 05:31:08:950PM | 930819030 | Yuichi Takase | Shot 030
good shot (sweeping R_out to the limiter), plasma dies after contacting limiter rf faulted Rlim=91, Rant=92 |
| Aug 19 1993 06:34:48:650PM | 930819030 | Yuichi Takase | Limiter and Antenna positions entered for shots 26-30 were wrong.
Correct positions are: Shot Lim Ant 026 90 92 027 90 92 028 90 91 029 90 91 030 90 91 |
| Physics Operator Comments | |||
| Aug 19 1993 09:17:40:790AM | 930819001 | Steve Horne |
RUN 930819 -- RF. Gas connections --- they WERE: V14 = PULSE_GAS_3 = A_SIDE (H2) V15 = PULSE_GAS_1 = B_SIDE_LOWER (Ar) V16 = PULSE_GAS_2 B_SIDE_UPPER (H2) For this run, they are: V14 = PULSE_GAS_3 = B_TOP (D2) V15 = PULSE_GAS_1 = B_SIDE_LOWER (Ar) V16 = PULSE_GAS_2 = B_SIDE_UPPER (H2) Shot 1 fill and puff from B side upper,1.2e-5. limiter at 93 cm. short, probably too much gas |
| Aug 19 1993 09:40:42:010AM | 930819001 | Steve Horne | Shot 2 -- reduce puff, drop fill to 1.e-5
Got hard x-rays. |
| Aug 19 1993 10:07:26:790AM | 930819004 | Steve Horne |
4 fill 1.3e-5 H more d2, earlier zcur=-.03 cm Got the zcur, but still lots of hards |
| Aug 19 1993 10:32:03:350AM | 930819005 | Steve Horne |
5 same fill h2 puff from (.003,34) to (-.008,50) efc V to 750 (was 700) Good shot. Scatterplot shows that 1'st 4 shots had low gas. This shot nominal compared to yesterday. |
| Aug 19 1993 10:48:49:720AM | 930819006 | Steve Horne | 6 Change d2 puff . (-.008,50) (+.1,50) (+.102,0)
Good shot. Definite change in ratiomatic signal at 100 msec -- -5.0 last shot, -4.8 this shot. |
| Aug 19 1993 11:10:32:230AM | 930819007 | Steve Horne |
7 Change d2 puff . (-.008,50) (+.2,50) (+.202,0) Drop h2 puff late in time. Died early, density increase at 250 msec. Gas or RF? |
| Aug 19 1993 11:30:40:020AM | 930819008 | Steve Horne |
8 disable PG2, B side upper, h2. Change d2 puff a bit, A dud -- no flash. No obvious magnetics problem; gas a hair high on scatterplot. |
| Aug 19 1993 11:52:55:710AM | 930819009 | Steve Horne | 9 Drop fill to 1.1e-5 (was 1.3). Adjust d2 programming -- 100 v 10 msec puffs
at -.03 and zero, then maintainance. Hards again. scatterplot shows gas and density decrease (compared to yesterday) at 30 msec or so. |
| Aug 19 1993 12:26:51:250PM | 930819010 | Steve Horne |
10 Switch fill to D2. Add D puff at -50 msec., 2 burps, then ramp. Fill at 1.1 e-5 in D, not H, so gauge factor difference makes it 1.4 or so. Still hards. |
| Aug 19 1993 12:27:12:090PM | 930819011 | Steve Horne | 11 Add another d2 puff at -80 msec. Fill at 1.3e-5.
Better, but not great -- like shots 3,4. First d2 puff is in at t=0. |
| Aug 19 1993 12:40:12:150PM | 930819013 | Steve Horne | 13 Shift d2 programming forward in time by 15 msec. This value based on getting 1.5e-5
on ratiomatic at breakdown. Fizzle -- probably not far enough. |
| Aug 19 1993 01:08:46:810PM | 930819014 | Steve Horne | 14 move d2 programming 10 msec later. This should be close.
good shot, but xrays again. |
| Aug 19 1993 01:46:38:260PM | 930819015 | Steve Horne | 15 Increase gas with ramp -- (-.065,50), (-.04,55) and so forth.
Fizzle. |
| Aug 19 1993 01:47:03:310PM | 930819016 | Steve Horne | 16 Reduce d2 a bit. Better, but still a fizzle.
|
| Aug 19 1993 01:48:18:130PM | 930819017 | Steve Horne | 17 Take a divot out of gas at -40 msec. Fizzle, but better still.
|
| Aug 19 1993 02:19:55:430PM | 930819018 | Steve Horne | 18 Bigger divot. That did it. This was a change in gas programming at -50 msec!.
First cmod shot in D2. |
| Aug 19 1993 02:20:22:740PM | 930819019 | Steve Horne | 19 Repeat. Few hards, not as good current rise. Scatterplot shows faster initial
density rise than yesterday. Density nice initially, then drops. |
| Aug 19 1993 03:34:10:590PM | 930819020 | Steve Horne | 20 Increase size of divot in gas programming, raise maintainance level to
fill in density. Poor current rise early. BZ looks too negative. |
| Aug 19 1993 03:34:34:380PM | 930819021 | Steve Horne | 21 Add 40 A to ef4. Fix ef4 programming to be flat from -.5 sec.
Better -- still not a nice current rise. |
| Aug 19 1993 03:34:56:260PM | 930819022 | Steve Horne | 22 Less gas from about -50 msec on. Good shot, a few xray sparkles.
Current rise from 30 msec on looks fine, but from 10-30 is low. |
| Aug 19 1993 03:35:26:310PM | 930819023 | Steve Horne | 23 Increase the width of the divot -- both earlier and (a bit) later.
Looks better -- best so far. Note that early gas was reduced but early density was higher. (around 30 msec or so.) |
| Aug 19 1993 04:14:17:590PM | 930819024 | Steve Horne | 24 Raise maintance gas a bit for more
density later. That worked but there's a peculiar density rise at .5 sec -- possibly due to RF or to vertical shift of plasma. |
| Aug 19 1993 04:30:09:990PM | 930819025 | Steve Horne | 25 Delicate gas tweak early; move upward jog to .56 msec or so.
Ok, a few xrays. Disrupts on the way down. |
| Aug 19 1993 04:31:24:730PM | 930819026 | Steve Horne | 26 Add a pinch of gas early, drop it late. OK.
|
| Aug 19 1993 04:55:43:480PM | 930819027 | Steve Horne | 27 remove about 2000 A from the OH2 coils around 200-300 msec,
to try to be more solidly limited. Earlier shots are nearly diverted, on the inner wall. Probably worked. Shot ok. |
| Aug 19 1993 04:56:09:390PM | 930819028 | Steve Horne | 28 Gas twiddle, essentially a repeat. Loose plasma early, sharks in the water.
|
| Aug 19 1993 05:09:43:520PM | 930819029 | Steve Horne | 29 Less gas late to try to submerge the shark fin. Also, ramp the plasma out
radially from (.2,.66) to (.3,.69), then back to (.4,.66) That worked, plasma died shortly after kissing the RF limiter. |
| Aug 19 1993 05:19:01:870PM | 930819030 | Steve Horne | Repeat -- same plasma, too.
|
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:03:22:780AM | Plasma | Ok | ecdc d2/shot 1 h2 st, pulse , no bd dud |
| 2 | 09:19:26:020AM | Plasma | Ok | plasma |
| 3 | 09:39:14:410AM | Plasma | Ok | lots a spark |
| 4 | 09:56:57:560AM | Plasma | Ok | plasma/no sparks |
| 5 | 10:14:29:050AM | Plasma | Ok | plasma |
| 6 | 10:30:15:680AM | Plasma | Ok | plasma |
| 7 | 10:51:07:690AM | Plasma | Ok | plasma |
| 8 | 11:11:08:200AM | Plasma | Ok | |
| 9 | 11:31:13:690AM | Plasma | Ok | plasma |
| 10 | 11:51:26:520AM | Plasma | Ok | d2 steady state & pulse |
| 11 | 12:10:37:590PM | Plasma | Ok | plasma |
| 12 | 12:25:53:760PM | Plasma | Ok | fizzle -- no faults |
| 13 | 12:37:13:000PM | Plasma | Ok | fizzle -- no faults |
| 14 | 12:51:48:890PM | Plasma | Ok | no faults |
| 15 | 01:07:22:070PM | Plasma | Ok | no faults -- double flash!! Two shots in one. |
| 16 | 01:19:59:140PM | Plasma | Ok | no faults |
| 17 | 01:34:26:400PM | Plasma | Ok | fizzle |
| 18 | 01:47:39:730PM | Plasma | Ok | no faults |
| 19 | 02:02:33:690PM | Plasma | Ok | |
| 20 | 02:18:48:280PM | Plasma | Ok | no faults |
| 21 | 02:40:02:390PM | Plasma | Ok | plasma |
| 22 | 02:59:37:550PM | Plasma | Ok | plasma |
| 23 | 03:15:53:980PM | Plasma | Ok | plasma |
| 24 | 03:33:52:320PM | Plasma | Ok | plasma |
| 25 | 03:52:32:640PM | Plasma | Ok | plasma |
| 26 | 04:09:29:020PM | Plasma | Ok | plasma |
| 27 | 04:27:00:760PM | Plasma | Ok | plasma |
| 28 | 04:41:26:740PM | Plasma | Ok | plasma |
| 29 | 04:55:41:170PM | Plasma | Ok | plasma |
| 30 | 05:08:37:420PM | Plasma | Ok | last shot #30 |