| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Bruce Lipschultz |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Andy Pfeiffer,Ed Fitzgerald,Gary Dekow |
| Engineering Operator Run Comment |
| MP#348a Boron injector experiments MP#355 ICRF Conditioning Session lea |
| Session Leader Plans |
| Entered: Mar 15 2006 05:28:03:477PM |
| Author: Bruce Lipschultz |
| MP#348a Boron injector experiments
Continuation of yesterday's run 12 PSI D2 in the NINJA. 1. Start with USN and obtain full length shots with RF (could take a while). GPI gas puff can be added anytime after first plasma. nl04 =0.8 2. Add the B injector for B to arrive at 0.5s once step 1 accomplished. (2-4 shots) 3. vary the density from 0.8 to 1.0 to 1.2, 2 shots each. 4. Vary SSEP from -.5 to 0.5 cm over shot (1050408026 with larger gaps and nl04~1.0. (2-4 shots) 5. Check out the diborane pufff suring a shot by puffing He. This should be started at the latest by 4PM. NINJA should be off and the Chromex spectrometer set for HeII. Probably no RF for the 1st shot or 2. Start in USN if that is convenient. |
| Physics Operators Plans |
| Entered: Mar 14 2006 05:42:51:630PM |
| Author: Robert Granetz |
Engineering setup for Wednesday 15 Mar 2006
MP#348a Boron injector experiments
MP#355 ICRF Conditioning
Session leaders: J. Irby & B. Lipschultz (MP 348a)
S. Wukitch (MP 355)
Physics operator: R. Granetz
Overnight ECDC in deuterium, and bake at 60 C.
Run begins at 09:00 and ends at 17:00.
Power systems as on 1060314014
A-coil configuration: normal [+Dtop -Dbot -Jtop +Jbot] and enabled.
Gas Setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar + 2 psi Ne 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 12 psi D2 Enabled
Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo shutters
Torvac setup: Gate valves open
Key diagnostics: Chromex, Kaiser spectrometers
-------------------------------------------------------------------------------
ICRF Setup: D and E in run-on by 08:30.
-------------------------------------------------------------------------------
Run plan: Continuation of yesterday's run (1060314).
1) Start with USN (use 1060314014, segment 3), with GPI D2 puff
after the first plasma is obtained. Continue until full-length
discharges are reliably obtained.
2) Add boron injector for B to arrive at 0.5 s (after step 1 is
accomplished)
3) Vary nl_04 from 0.8 to 1.0 to 1.2e20 m-2 (2 shots each)
4) Vary SSEP from -0.5 to +0.5 cm during shot (use 1060314014, segment 4)
5) Check out the diborane puff hardware during a shot by puffing
helium. This should be started by 16:00 at the latest. NINJA should
be off, and the Chromex spectrometer set for HeII. Probably no RF
for the first shot or two. Start in USN if convenient.
Note that it will be necessary to use the beta version of PCS to test
the diborane (helium) puff (in /usr/local/cmod/codes/pcs3-Beta/pcs)
|
| Session Leader Summaries |
| Entered: Mar 15 2006 05:54:49:990PM |
| Author: Bruce Lipschultz |
| MP#348a Boron injector experiments
Continuation of yesterday's run Fairly successful through about midday. We were able to get USN plasmas at a range in densities and RF powers. At the higher densities D port had problems (high pressure). The densities covered were nl04 = 0.8, 0.9, 1.1 e20 The RF powers were 1.0, 2.0, 2.6, 3.0 MW The B salt shaker was used most of the day until we started having startup problems. Good data for analysis and comparison to the few LSN shots from yesterday. Afternoon - Beware the ides of March We tried to get an USN closer to SSEP ~ 0.5 and repeatedly had multiple fizzles/duds and an occasional shot. When the SSEP got close to where we wanted we got disruptions as well. We did not achieve the SSEP sweep. 2 shots were devoted to checking out the diborane puff circuit. The first shot (33) went fine but no puff. The second shot went fine till the He puff went in - the puff was too large and the plasma disrupted. |
| Physics Operator Summaries |
| Entered: Mar 15 2006 05:26:49:320PM |
| Author: Robert Granetz |
Physics operator summary for Wednesday 15 Mar 2006:
MP#348a Boron injector experiments
MP#355 ICRF Conditioning
Session leaders: J. Irby & B. Lipschultz (MP 348a)
S. Wukitch (MP 355)
Physics operator: R. Granetz
The first half of the day went pretty well. We ran 1 MA, upper single null
equilibria at nl_04=0.8e20 m-2. The NINJA GPI puffs started on shot 3, and
boron powder injection started on shot 4. We then ran nl_04=1.0e20 m-2,
and finally 1.2e20 m-2 (actually got 1.1e20), essentially accomplishing the
first 3 items on the run task list. Then we ran into a series of very
short discharges (barely more than fizzles) on shots 14-16. These looked
like they may have been killed by ambient boron powder, so we turned off
the injector. But I couldn't get reliable plasma operation back again for
the remainder of the day, with numerous fizzles and duds. Shot 22 was our
first attempt at SSEP control, but we were not able to make much progress
on this part of the experiment. I eventually did 20 minutes of ECDC
between shots 26 and 27, but that didn't help either. Even a reload of the
startup from the first shot of the day didn't work. Shots 24 and 31 did
go, but they both disrupted in the current rampup. Steve Wolfe figured out
that this was because the present SSEP control was not compatible with
running upper null plasmas, so I abandoned that part of the run after shot
31.
Ian then convinced me (with a $5 bet) to reduce the pre-fill puff all the
way down to 20 ms, and that gave us successful plasmas on the last two
shots. Thank you, Ian.
Shot 33 was our first attempt to use the diborane valve (but using
helium). I programmed in a 100 ms pulse at t=1.0 s, but the valve didn't
open. This prompted Steve Wolfe to remember that there is a bug in DPCS
which requires finite programming to be in segment 1 as well as the later
segment(s). So I did this for shot 34, and also increased the pulse
duration to 200 ms. This worked, and puffed in enough gas to quickly
double the density and disrupt the plasma. Clearly we'll have to use much
shorter pulses with the diborane.
One last note: in order to program the diborane valve, I had to use the
new beta version of the DPCS program. This worked fine all day, with no
problems other than the bug that we tripped over on shot 33.
Scorecard: 18 plasmas (several were very short)
6 duds
9 fizzles
0 gas system tests
1 TF scanner tests
0 power supply tests
0 MDSplus cycle tests
--------------
Total: 34 shot cycles
|
| Session Leader Comments | |||
| Mar 15 2006 09:47:38:887AM | 1060315002 | Bruce Lipschultz | shot 2: Basically what we need - 1MA, nl04 ~0.7. RF is fine. Inner gap is a little too large. That wwill be reduced.
Next shot reduce gap and turn on NINJA. |
| Mar 15 2006 10:18:08:167AM | 1060315003 | Bruce Lipschultz | shot 3: Still good - 1MA, nl04 ~0.8. RF is fine. Inner gap reduced to 1.3 mm.
NINJA on, good data. |
| Mar 15 2006 10:18:24:540AM | 1060315004 | Bruce Lipschultz | shot 3: Dud.
Move the RF and NINJA (2nd pulse) earlier by 50 ms Boron shaker on |
| Mar 15 2006 10:21:36:213AM | 1060315005 | Bruce Lipschultz | shot 5: Good shot. Shaker on. CXRS signal saturated on Inner wall views 5 & 6. So, it appears that USN leads to more B in the plasma since yesterday, with LSN, we did not sarturate the BV CXRS line.
Lower the gain on the CCD detector. |
| Mar 15 2006 10:42:22:463AM | 1060315006 | Bruce Lipschultz | shot 6: fizzle |
| Mar 15 2006 10:41:52:230AM | 1060315007 | Bruce Lipschultz | shot 7: Good shot. Shaker on. CXRS signal unsaturated by lowering the gain.
Got a very short H-mode. |
| Mar 15 2006 10:53:48:527AM | 1060315008 | Bruce Lipschultz | shot 8: Full shot with L-mode and good CXRS signal.
Next shot start density scan |
| Mar 15 2006 11:13:52:747AM | 1060315009 | Bruce Lipschultz | shot 9: Full shot with L-mode and good CXRS signal.
nl04 raised to 1.0e20 ICRF had a bit of an iussue at 2.8 MW. Lower it and repeat. |
| Mar 15 2006 11:12:58:667AM | 1060315010 | Bruce Lipschultz | shot 10: Full shot with L-mode and good CXRS signal. RF was steadier but had to lower the power from 2.8 to 2.5 MW.
Denisty nl04~1.0 e20 |
| Mar 15 2006 11:45:01:053AM | 1060315011 | Bruce Lipschultz | shot 11: First try at higher density but the interferometer had a problem and gave us low density leading to a disruption.
Repeat at the higher density. |
| Mar 15 2006 12:23:11:710PM | 1060315012 | Bruce Lipschultz | shot 12: Got the higher density (nl04 ~ 1.1) but the RF (D-port) could not take the high pressures.
Repeat at nl04 ~ 1.2 |
| Mar 15 2006 11:56:39:193AM | 1060315013 | Bruce Lipschultz | shot 13: fizzle.
Got to lower density to start the power scan. |
| Mar 15 2006 12:22:39:960PM | 1060315014 | Bruce Lipschultz | shot 14: fizzle again after long cell opening to tune the interferometer. |
| Mar 15 2006 01:23:12:710PM | 1060315015 | Bruce Lipschultz | shot 15: fizzle again |
| Mar 15 2006 01:23:21:163PM | 1060315016 | Bruce Lipschultz | shot 16: fizzle again |
| Mar 15 2006 01:24:35:163PM | 1060315017 | Bruce Lipschultz | shot 17: Shot back.
nl04 ~ 0.9, B injector off. 2 MW |
| Mar 15 2006 01:24:55:553PM | 1060315018 | Bruce Lipschultz | shot 18: nl04 ~ 0.9, B injector off. 1 MW |
| Mar 15 2006 01:25:06:617PM | 1060315019 | Bruce Lipschultz | shot 19: fizzle |
| Mar 15 2006 01:32:40:507PM | 1060315020 | Bruce Lipschultz | shot 20: fizzle |
| Mar 15 2006 01:46:02:693PM | 1060315021 | Bruce Lipschultz | shot 21: dud |
| Mar 15 2006 02:05:04:600PM | 1060315022 | Bruce Lipschultz | shot 22: SHot fine, FR power 2.6 MW, nl04 ~ 0.9.
SSEP ~ 1.1 cm so a little too high. Next shot shoot for 5 mm. |
| Mar 15 2006 02:13:28:943PM | 1060315023 | Bruce Lipschultz | shot 23: fizzle |
| Mar 15 2006 02:27:26:630PM | 1060315024 | Bruce Lipschultz | shot 24: disrupted early |
| Mar 15 2006 03:25:59:710PM | 1060315025 | Bruce Lipschultz | dud |
| Mar 15 2006 03:26:09:037PM | 1060315026 | Bruce Lipschultz | fizzle |
| Mar 15 2006 03:26:17:460PM | 1060315027 | Bruce Lipschultz | fizzle |
| Mar 15 2006 05:24:19:867PM | 1060315028 | Bruce Lipschultz | fizzle |
| Mar 15 2006 05:24:30:803PM | 1060315029 | Bruce Lipschultz | dud |
| Mar 15 2006 05:24:41:977PM | 1060315030 | Bruce Lipschultz | dud |
| Mar 15 2006 05:25:16:930PM | 1060315031 | Bruce Lipschultz | disrupted early on. SSEP control not ready for prime time. |
| Mar 15 2006 05:25:26:193PM | 1060315032 | Bruce Lipschultz | fizzle |
| Mar 15 2006 05:26:22:180PM | 1060315033 | Bruce Lipschultz | Good shot without SSEP control. Trying the He puff. Did not go in. |
| Mar 15 2006 05:26:56:413PM | 1060315034 | Bruce Lipschultz | disrupted due to He puff. |
| Physics Operator Comments | |||
| Mar 14 2006 11:24:20:317PM | Robert Granetz | DPCS loaded from shot 1060314014 (all segments). Segment 3 is active (USN, 1.0 MA, 0.8e20 m-2. B21_PROJ is on wire 09, and turned on. Note that I am using the beta version of DPCS. | |
| Mar 15 2006 08:53:36:870AM | 1060315001 | Robert Granetz | Shot 01 -- Test. Check TF scanner. Turn 49 is now reading okay. |
| Mar 15 2006 09:25:04:260AM | 1060315002 | Robert Granetz | Shot 02 -- Plasma. Good shot. Upper single null, 1.0 MA, 5.46 T, nl_04=0.7-0.8e20 m-2. Inner gap = 1.5 cm, outer gap = 1.7 cm. Prf=1.5 MW from D and E. Next shot: reduce inner gap to 1.3 cm, keeping outer gap the same (move CLEARIN -2 mm and RCUR -1 mm) |
| Mar 15 2006 09:41:37:963AM | 1060315003 | Robert Granetz | Shot 03 -- Plasma. Good shot. USN. nl_04=0.8e20 m-2. Prf=2 MW. Inner gap = 1.3 cm, but outer gap is now 1.8 cm. Next shot: decrease RCUR another 1 mm. Add 0.1 mT to Br0. Sprinkle boron. Open Z-bolo (should have been open at start of run) |
| Mar 15 2006 09:50:28:290AM | 1060315004 | Robert Granetz | Shot 04 -- Dud. Next shot: Tweaks...add 10 amps to IC_EF4, reduce pre-fill puff by 1 ms. |
| Mar 15 2006 10:09:33:260AM | 1060315005 | Robert Granetz | Shot 05 -- Plasma. Good shot. USN. Lots of boron powder. GPI is puffing D2. F-probe is scanning. Next shot: Repeat. Move Ar/Ne puff to t=0.3 s (was at t=1.3 s for some reason). |
| Mar 15 2006 10:15:54:980AM | 1060315006 | Robert Granetz | Shot 06 -- Fizzle. Next shot: add 0.1 mT to Br0. Increase RCUR by 1 mm. |
| Mar 15 2006 10:40:29:823AM | 1060315007 | Robert Granetz | Shot 07 -- Plasma. Good shot. USN. A brick fell in around t=1.1 s. Next shot: no changes. |
| Mar 15 2006 10:51:59:557AM | 1060315008 | Robert Granetz | Shot 08 -- Plasma. Good shot. USN. Lots of sprinkled boron. Prf=3 MW. Long L-mode. nl_04=0.8e20 m-2. Next shot: increase nl_04 to 1.0e20 m-2. |
| Mar 15 2006 10:59:50:917AM | 1060315009 | Robert Granetz | Shot 09 -- Plasma. Good shot. USN. nl_04=1.0e20 m-2. Pretty good L-mode performance (Wth=100+ kJ, RDD=1.5e13 s-1, Temax=4.0 keV) Next shot: repeat, no changes |
| Mar 15 2006 11:14:47:323AM | 1060315010 | Robert Granetz | Shot 10 -- Plasma. Good shot. USN. nl_04=1.0e20 m-2. Prf=2.7 MW. Next shot: raise nl_04 to 1.2e20 m-2. |
| Mar 15 2006 11:34:12:127AM | 1060315011 | Robert Granetz | Shot 11 -- Plasma. Disrupted at t=1.32 s. Looks like a brick fell in, maybe several injections. TCI went haywire, including the feedback signal. Gas was off for most of the shot. Need to repeat this one. Next shot: repeat with TCI working. Also reduce Ar/Ne pulse to 30 ms (from 40 ms). |
| Mar 15 2006 11:37:47:943AM | 1060315012 | Robert Granetz | Shot 12 -- Plasma. Good shot. USN. nl_04=1.1e20 m-2. D-antenna didn't go. Next shot: repeat with D and E antennas both working. Increase requested nl_04 to 1.3e20 m-2. |
| Mar 15 2006 11:46:42:680AM | 1060315013 | Robert Granetz | Shot 13 -- Fizzle. Since the RF isn't coupling well due to the high neutral pressure, we won't bother trying for this shot again. Next shot: reduce nl_04 to 1.0e20 m-2. |
| Mar 15 2006 12:21:18:147PM | 1060315014 | Robert Granetz | Shot 14 -- Fizzle. Looks like it was killed by a very early injection. Bz is a little high as well. Next shot: add -10 amps to IC_EF4 |
| Mar 15 2006 12:32:18:273PM | 1060315015 | Robert Granetz | Shot 15 -- Plasma/fizzle. Got to 75 kA and then it died again. Bz is still high, even higher than on the previous shot, even though I made IC_EF4 more negative. Next shot: add another -10 amps to IC_EF4 (to -1345 A) |
| Mar 15 2006 12:44:57:443PM | 1060315016 | Robert Granetz | Shot 16 -- Plasma/fizzle again. Fields and gas look very good. LH camera shows lots of stuff falling down...could the leftover boron powder be doing us in. Next shot: disable boron injector and see if we can clean up the powder. No PCS changes. |
| Mar 15 2006 12:56:15:193PM | 1060315017 | Robert Granetz | Shot 17 -- Plasma. Good shot. USN. nl_04=0.9e20 m-2. Startup had lots of carbon? light and a long hesitation at 90 kA. Next shot: no PCS changes. Boron injector will still be off. |
| Mar 15 2006 01:15:15:023PM | 1060315018 | Robert Granetz | Shot 18 -- Plasma. Good shot. USN. nl_04=1.0e20 m-2. Really good startup. Next shot: import the SSEP wire into segment 3 and program it at +2.5 mm, hoping to get around +5 mm (USN). |
| Mar 15 2006 01:20:24:630PM | 1060315019 | Robert Granetz | Shot 19 -- Fizzle. Fields and gas look good. Next shot: tweak Br0 down by 0.1 mT. |
| Mar 15 2006 01:34:37:413PM | 1060315020 | Robert Granetz | Shot 20 -- Dud. Fields look fine. Next shot: add 2 ms to pre-fill. Also, Steve W reminded me to change the reference for the SSEP wire to Ip instead of 10 volts (actually wires 09-12 will now reference Ip). |
| Mar 15 2006 01:44:59:147PM | 1060315021 | Robert Granetz | Shot 21 -- Dud. Next shot: add another 3 ms to pre-fill (will now be at 30 ms) |
| Mar 15 2006 02:02:05:583PM | 1060315022 | Robert Granetz | Shot 22 -- Plasma. Good shot. USN. SSEP= +10-11 mm. The SSEP and the ZXU are fighting each other, as expected. Next shot: decrease the gain on ZXU from 8 to 1 in order to help the SSEP control. |
| Mar 15 2006 02:12:06:130PM | 1060315023 | Robert Granetz | Shot 23 -- Fizzle. Fields look fine. Pre-fill pressure went up a little. Next shot: decrease pre-fill by 2 ms. |
| Mar 15 2006 02:23:19:443PM | 1060315024 | Robert Granetz | Shot 24 -- Plasma, but disrupted around 0.2 s, probably due to an impurity injection around 0.16 s. Next shot: repeat, no changes. |
| Mar 15 2006 02:34:08:380PM | 1060315025 | Robert Granetz | Shot 25 -- Dud! The preceding shot had a beautiful startup, and this one was a dud. Unbelievable. Next shot: add 2 ms back to pre-fill. |
| Mar 15 2006 03:16:42:820PM | 1060315026 | Robert Granetz | Shot 26 -- Fizzle. I give up...we'll do 20 minutes of between-shot ECDC. Next shot: no changes (following approximately 23 minutes of ECDC) |
| Mar 15 2006 03:22:48:537PM | 1060315027 | Robert Granetz | Shot 27 -- Fizzle. Next shot: reduce pre-fill 1 ms; add -5 amps to IC_EF4. |
| Mar 15 2006 03:38:58:787PM | 1060315028 | Robert Granetz | Shot 28 -- Fizzle. Next shot: reload segment 1 from the first plasma today (shot 2) |
| Mar 15 2006 03:50:55:820PM | 1060315029 | Robert Granetz | Shot 29 -- Dud. That didn't work. Next shot: reload segment 1 from shot 28, decrease IC_EF4 by 15 amps (i.e. add -15 amps) |
| Mar 15 2006 04:00:14:600PM | 1060315030 | Robert Granetz | Shot 30 -- Dud. Next shot: add 3 ms to pre-fill. |
| Mar 15 2006 04:35:17:430PM | 1060315031 | Robert Granetz | Shot 31 -- Plasma, but disrupted at t=0.33 s. Might be something to do with trying to use the SSEP control with USN plasmas. I'm abandoning this part of the run. Instead, I'll jump to the last objective, which is testing the diborane valve. Next shot: reload segment 3 from shot 5 (a good USN with nl_04=0.8e20 m-2), and program the diborane piezo valve for a 100 ms pulse starting at t=1.0 s. Note that we are actually using helium, not diborane, for these tests. |
| Mar 15 2006 04:47:00:227PM | 1060315032 | Robert Granetz | Shot 32 -- Fizzle. Very late fizzle at that. Next shot: based on a bet with Ian, I will lower the pre-fill puff to 20 ms. |
| Mar 15 2006 05:02:31:553PM | 1060315033 | Robert Granetz | Shot 33 -- Plasma. Good shot. Ian won the bet, and also helped us to recover operation. Pretty good startup. But the diborane valve didn't open. Steve W thinks its because of a bug in DPCS which requires non-zero programming to also be in segment 1. Next shot: increase diborane piezo pulse to 200 ms, starting at t=1.0 s. Also put some dummy programming for the valve into segment 1 (after t=0.1 s, so that it doesn't do anything to the valve). |
| Mar 15 2006 05:11:43:117PM | 1060315034 | Robert Granetz | Shot 34 -- Plasma. Good shot. USN. The diborane valve successfully opened and puffed in enough helium to disrupt the plasma. Clearly we will have to have pulses much shorter than 200 ms when we switch to diborane. End of run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:47:22:103AM | Test | Ok | |
| 2 | 09:12:55:137AM | Plasma | Ok | |
| 3 | 09:29:57:590AM | Plasma | Ok | |
| 4 | 09:43:22:887AM | Plasma | Ok | |
| 5 | 09:55:44:900AM | Plasma | Ok | |
| 6 | 10:10:51:697AM | Plasma | Ok | |
| 7 | 10:23:29:277AM | Plasma | Ok | |
| 8 | 10:38:34:183AM | Plasma | Ok | |
| 9 | 10:51:02:510AM | Plasma | Ok | |
| 10 | 11:05:25:963AM | Plasma | Ok | |
| 11 | 11:18:04:993AM | Plasma | Ok | |
| 12 | 11:30:43:810AM | Plasma | Ok | |
| 13 | 11:43:15:490AM | Plasma | Ok | |
| 14 | 12:11:54:913PM | Plasma | Ok | |
| 15 | 12:24:13:413PM | Plasma | Ok | |
| 16 | 12:36:49:727PM | Plasma | Ok | |
| 17 | 12:49:10:147PM | Plasma | Ok | |
| 18 | 01:01:42:490PM | Plasma | Ok | |
| 19 | 01:14:52:727PM | Plasma | Ok | |
| 20 | 01:27:16:537PM | Plasma | Ok | |
| 21 | 01:39:41:303PM | Plasma | Ok | |
| 22 | 01:52:12:380PM | Plasma | Ok | |
| 23 | 02:04:43:053PM | Plasma | Ok | |
| 24 | 02:17:11:303PM | Plasma | Ok | |
| 25 | 02:29:49:600PM | Plasma | Ok | |
| 26 | 02:42:26:647PM | Plasma | Ok | |
| 27 | 03:19:22:850PM | Plasma | Ok | |
| 28 | 03:32:04:787PM | Plasma | Ok | |
| 29 | 03:44:52:867PM | Plasma | Ok | |
| 30 | 03:57:29:773PM | Plasma | Ok | |
| 31 | 04:10:01:477PM | Plasma | Ok | |
| 32 | 04:39:30:977PM | Plasma | Ok | |
| 33 | 04:52:49:023PM | Plasma | Ok | |
| 34 | 05:05:09:630PM | Plasma | Ok | |