| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Bruce Lipschultz,Matt Reinke |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Andy Pfeiffer,Bill Byford,Gary Dekow |
| Engineering Operator Run Comment |
| MP 565 AM SL - Bruce Lipschultz MP 569 1/2-Day PM SL: ML Reinke PO - R. |
| Session Leader Plans |
| Entered: Sep 8 2009 10:44:54:533AM |
| Author: Matt Reinke |
| MP 569: Demonstrating Stable EDA H-mode with Significant Impurity Seeding (1/2-Day PM)
SL: ML Reinke PO: R. Granetz The purpose of this experiment is create stable, steady EDA H-mode plasmas seeded with enough non-intrinsic impurities to produce an additional 1-2 MW of radiation as compared to the unseeded plasma. Diagnostics: All Te and n_e profile diagnostics that are working (GPC1 and GPC2, TCI). All impurity spectroscopy (HIREX, bolometry, McPherson, CHROMEX, CXRS) and PRAD (foils, AXUV diodes) Cryopump required ICRF: 3-5 MW ICRF Gas Puffs: Various gases (Ne, N2, Xe, Ar) through B-SIDE LOWER. Fill plenum with 3.0 psi of Ne but disable for first few shots. 1) Establish target EDA H-mode. Use 1090902011 equilibrium. ICRF at 3.5 MW from 0.6-1.5. Ip=800 kA, nl04=1.0e20 [shots 1-2] 2) Repeat target discharge with Ne puff enabled from 0.3-0.5 seconds. Adjust puff pressure and duration and, if necessary ICRF power. Achieve > 1 MW (via 2pi-diode w/ ff=3.0) of additional PRAD compared to target. [shots 3-5] 3) Fill B-SIDE LOWER with 2 psi of 5:1 mixed D2:Xe. Repeat target discharge with Xe puff enabled from 0.3-0.4 seconds. Achieve > 1 MW (via 2pi-diode w/ ff=3.0) of additional PRAD compared to target. [shots 6-8] 4) Fill B-SIDE LOWER with 4 psi of N2. Repeat target discharge with N2 puff enabled from 0.3-0.5 seconds. Achieve > 1 MW (via 2pi-diode w/ ff=3.0) of additional PRAD compared to target. [shots 11-13] If there is time: 5) Fill B-SIDE LOWER with 1.5 psi of Ar. Repeat target discharge with Ar puff enabled from 0.3-0.45 seconds. Achieve > 1 MW (via 2pi-diode w/ ff=3.0) of additional PRAD compared to target. [shots 14-16] |
| Entered: Sep 8 2009 03:36:54:867PM |
| Author: Bruce Lipschultz |
| MP 565 - 'Measurement of in-out asymmetry in boron density'
The goal is to directly infer the ratio of B+4 density at the low-field side (LFS) and high-field sides (HFS) of the plasma. This result will be compared to a model of the poloidal asymmetry. SL - Bruce Lipschultz PO - R. Granetz He ECDC overnight. Breakdown in He if it makes sense. The initial goal is 1 MA plasmas with nl04 ~ 0.6x10^20/m2. Inner gap ~ 1 cm. Outer gap ~ 2 cm. Candidates for previous discharges to use are 1090730028 or 1090731003. Ideally we have breakdown in He to minimize the D in the discharge. The less D in the discharge the more sure we are that we are just measuring B+4 light as opposed to cxr light from B+5 (for which we have no crosssections and cannot be sure that the neutral density is the same at the inner and outer edges and thus will not be able to compare the in-out asymmetries in B+5). - ICRF power should either be stepped up or ramped during the discharge to have both L- and H-modes periods. |
| Physics Operators Plans |
| Entered: Sep 8 2009 10:52:10:963PM |
| Author: Robert Granetz |
Engineering setup for Wednesday 2009/09/09
MP565 - In/out boron density asymmetry (am)
MP569 - Stable EDA H-modes with impurity seeding (pm)
Session leaders: B. Lipschultz (am), M. Reinke (pm)
Physics operator: R. Granetz
Overnight ECDC in HELIUM and 60 C bake
Run will start at 09:00 and end at 17:00.
Power systems as on 1090731003 (Bt=5.4T, Ip=1.0 MA)
A-coil configuration: +Dtop -Dbot -Jtop +Jbot; Enabled (standard
configuration)
Gas Setup:
fill B-Top with 6 psi He Hybrid enabled (PG4)
fill B-side lower with 3 psi Ne Hybrid DISABLED (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill B-main (C-side) with 40 psi He Hybrid enabled (PG3)
leave NINJA as is DISABLED
Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo
Torvac setup: keep gate valves open during PULSE
Specific diagnostics: All impurity spectroscopy (HIREX, bolometry,
McPherson, CHROMEX, CXRS) and PRAD (foils, AXUV diodes)
------------------------------------------------------------------------------
ICRF Setup: all systems in run-on by 08:30
LH Setup: no
DNB: no
Cryopump: YES (pm)
------------------------------------------------------------------------------
Run plan: (am) Helium plasmas, including helium breakdown. Load seg 2 from
seg 2 of 1090731003. Load seg 1 from seg 1 of 1090820033. (Note:
may want to remove PG3 programming in seg 2.) The initial goal
is 1 MA plasmas with nl04 ~ 0.6x10^20/m2. Inner gap ~ 1 cm. Outer
gap ~ 2 cm. The goal is to directly infer the ratio of B+4
density at the low-field side (LFS) and high-field sides (HFS) of
the plasma.
(pm) The purpose of this experiment is create stable, steady EDA
H-mode plasmas seeded with enough non-intrinsic impurities to
produce an additional 1-2 MW of radiation as compared to the
unseeded plasma. Use 1090902011 equilibrium. Puff various gases
(Ne, N2, Xe, Ar) through B-side-lower.
|
| Session Leader Summaries |
| Entered: Sep 9 2009 02:32:35:980PM |
| Author: Bruce Lipschultz |
|
Given the handicap of losing 1.5 hours to software issues we accomplished a lot today. We were able to obtain plasmas at three different currents, over 2 different densities (a third density at 1 MA). In all discharges the RF power was ramped up. There were only a few H-modes of decent length. The best were at the lower current and medium density (shot 12) which EDA-like. For the last discharge we switched to the 'grazing incidence' equilibrium in an effort to try for more steady state H modes. That did not succeed. There did seem to be decent signal during all discharges. However, we were hoping to get enough H-modes of decent length so as to have in-out comparisons where there is a pedestal. shot Ip(MA) nl04 3 1 0.6 6 1 0.5 7 0.7 0.6 8 1.2 0.5 10 1.2 0.9 11 1.0 0.9 12 0.7 0.9 14 1.0 1.2 16 0.8 0.8 (grazing incidence equilibrium) |
| Entered: Sep 9 2009 06:41:38:193PM |
| Author: Matt Reinke |
| Summary for the 2nd half of 1090909 - MP 569
-------------------------------------------- The run went better than expected and Ne, Xe and N2 were all used. In general it worked well to have a puff started prior to the ICRF turn on which most times was also the L->H transition. The puff pressure had to be tweaked so that the PRAD rise didn't kill the plasma before the RF came on. It doesn't look like the cryopump helped at all so we can probably drop that for later runs. Shots 018-021 were the fiducial comparing to 1090902011. 020,021 were supposed to be Ne puffing but B-SIDE-LOWER wasn't enabled. The 1st H-mode in 021 will be the standard baseline for comparison for this days shots, although PRAD is up by 1/3 from the 1090902011 H89 has dropped. Shots 022-025 had Ne puffing. 1.5 psi from 0.4-0.6 (023) increased PRAD ~ 0.75 MW and 2.0 psi from 0.4-0.6 (025) increased PRAD by ~1.5 MW. This gas programming will work well with a pressure change to vary the absolute PRAD level. Shots 026-029 had Xe puffing. 5:1 at 1.5 psi was a bit too week, 3:1 at 2 psi was too agressive and 4:1 at 1.5 psi. Don't really know how much was Xe vs. others, but I have a place to start for future Xe-seeded H-modes. Shots 030-031 had N2 puffing. 030 had significant Xe to the point of disrupting so switched to B-SIDE-UPPER for N2 puffing. Hard to determine how much really got in, so I'll have to try this again. |
| Physics Operator Summaries |
| Entered: Sep 9 2009 10:48:28:710PM |
| Author: Robert Granetz |
Run summary for Wednesday 2009/09/09
MP565 - In/out boron density asymmetry (am)
MP569 - Stable EDA H-modes with impurity seeding (pm)
Session leaders: B. Lipschultz (am), M. Reinke (pm)
Physics operator: R. Granetz
Today's operation consisted of two half-day runs. The morning run (MP565)
was done in helium plasmas with helium breakdown and startup. This
requires a dedicated segment 1, as well as a dedicated density program in
segment 2 (wire 14). A current scan was successfully done (0.7-1.2 MA)
while keeping the inner and outer gaps and the strikepoint constant, and
linearly ramping the ICRF power up to 4 MW during the flattop.
Unfortunately, this resulted in damage to Langmuir probe #6 on the outboard
divertor. This cannot be repaired without manned access. Some short
H-modes in helium were observed. The last few shots were done with the
"double grazing" equilibrium developed during Jerry Hughes's run last week.
The afternoon run (MP569) was done in D2 plasmas (with D2 breakdown and
startup), and involved seeding the plasmas with neon, xenon (mixed with
D2), and nitrogen, and was also quite successful.
The machine ran well today. In particular, the ICRF was very reliable, in
both helium and deuterium. In addition, this afternoon was the first time
this campaign that the cryopump was used during plasma operation. Helium
startup has a noticeably higher probability of fizzles (4 fizzles),
particularly after disruptions. Once we changed to D2 at midday, we had
only one fizzle, and that was due to the cryopump regenerating just seconds
before the shot. At the beginning of the day there were some MDS software
problems due to changes that were made prior to this week's operation.
This cost us three no-power shot cycles (shots 1, 2, and 4) and about an
hour of run time.
Scorecard: 23 plasmas
0 duds
5 fizzles (one because cryopump regenerated just before shot)
0 power supply tests
3 no-power MDS shot cycles
--------------
Total: 31 shot cycles (100% reliability)
|
| Session Leader Comments | |||
| Sep 9 2009 10:16:53:693AM | 1090909003 | Bruce Lipschultz | shot 3: First shot after hiatus for computer software issues.
1 MA, nl04 ~ 0.6e20 PRF ramping from 1.5 to 4 MW disrupted at 1.4 seconds - probably tungsten. Strike point too low. L- mode the entire time. No power next shot. But for plasma Bob will raise the strike point (raise the x-point). |
| Sep 9 2009 10:53:59:787AM | 1090909006 | Bruce Lipschultz | shot 6: Good shot, no disruption
1 MA, nl04 ~ 0.5e20 PRF ramping from 1.5 to 4 MW Strike point pretty good L- mode the entire time. There were some spikes on the density but it did not really look like H-mode. Next shot go to 700 kA. Same density. |
| Sep 9 2009 11:03:13:180AM | 1090909007 | Bruce Lipschultz | shot 7: Good shot, no disruption
0.7 MA, nl04 ~ 0.6e20 PRF ramping from 1.5 to 4 MW Strike point pretty good L- mode the entire time. There was some density rise after 1 second. Chromex shows lots of lines coming up on the GH limiter view. Matt's AXUV toroidal views and interpretation of the wide angle view indicate that the GH_limiter might be hot but the TCs say no. Next shot go to 1.2 MA. Same density. |
| Sep 9 2009 11:13:14:327AM | 1090909008 | Bruce Lipschultz | shot 8: Disruption at 0.7s
1.2 MA, nl04 ~ 0.5e20 PRF ramp started L- mode the entire time. Looks like an injection killed that. Next shot try again, raise the requested density to 0.9. |
| Sep 9 2009 11:45:54:947AM | 1090909010 | Bruce Lipschultz | shot 10: No disruption
1.2 MA, nl04 ~ 0.9e20 PRF ramp fine to 4 MW L- mode the entire time. Next shot 1 MA, same density. |
| Sep 9 2009 11:57:20:047AM | 1090909011 | Bruce Lipschultz | shot 11: No disruption
1.0 MA, nl04 ~ 0.9e20 PRF ramp fine to 4 MW Brief H-modes for PRF above 3 MW. Next shot 0.7 MA, same density. |
| Sep 9 2009 12:22:13:993PM | 1090909012 | Bruce Lipschultz | shot 12: No disruption
0.7 MA, nl04 ~ 0.9e20 PRF ramp fine to 5 MW Longer H-modes for PRF above 3 MW. Next shot 1.0 MA, nl04 ~ 1.2, strike point sweeping a bit to not burn up any more of Brian's probes. |
| Sep 9 2009 12:52:12:740PM | 1090909014 | Bruce Lipschultz | shot 14: No disruption
1.0 MA, nl04 ~ 1.2e20 PRF ramp fine to 5 MW Short H-modes for PRF above 3 MW. Next shot reloading 1090902032 which is the grazing incidence equilibrium run last week that had ELMs and pretty steady H-mode. |
| Sep 9 2009 02:10:28:080PM | 1090909016 | Bruce Lipschultz | shot 16: No disruption
0.8 MA, nl04 ~ 0.8e20 PRF ramp fine to 3.5 MW There are what appears to be H-modes. Next shot for the other mp - Reinke. |
| Sep 9 2009 01:33:38:300PM | 1090909017 | Matt Reinke | Changing over to MP 569 - Radiative EDA H-modes.
Establish target discharge like 1090902011. This time it will have cryopumping. No impurity puffing. RF 3.5 MW steady from 0.6 to 1.5. Shot disrupted in the current ramp. Lots of early hards. K-LIM had a ~70 deg deltaT. NEXT: No changes, try again w/o runaways. |
| Sep 9 2009 01:45:06:760PM | 1090909018 | Matt Reinke | Full length shot with target Ip and nl04 reached. RF tripped many times and neutron rate is a bit low (5e12). Probably some He left over that needs to be outgassed.
NEXT: Repeat target shot w/ better ICRF. |
| Sep 9 2009 02:05:03:203PM | 1090909019 | Matt Reinke | Better shot. Neuts up, RF looks good. Got a large Fe injection during the 1st H-mode with Ni coming to kill the 2nd H-mode just before 1.3. Target looks good, can't really help the injections, just hope they go away.
NEXT: start with the Ne gas puffing. Enable B-SIDE-LOWER from 0.3-0.5 (3 psi Ne). Also IW NINJA wants to fire. Enabled at 1.2 seconds. |
| Sep 9 2009 02:22:24:240PM | 1090909020 | Matt Reinke | Very week Ne signature in plasma. No dramatic increase in PRAD from 019.
NEXT: Increase Ne puff pressure to 5 psi and change puff time to 0.4-1.0 seconds. |
| Sep 9 2009 02:38:17:717PM | 1090909021 | Matt Reinke | Discovered that the B-SIDE-LOWER wasn't enabled so we haven't been getting no Ne in on 021 or 020.
NEXT: Return back to 3 psi 0.3-0.5 sec. puff but this time ACTUALLY PUT THE GAS IN!!!! |
| Sep 9 2009 02:47:26:673PM | 1090909022 | Matt Reinke | See the PRAD rasie after 0.4 seconds and the Ne on the McPherson. Looks like it cools the plasma too much before the ICRF can get in. Core is at 1 keV with edge GPC < 100 eV.
NEXT: Reduce pressure to 1.5 psi and shift timing to 0.4-0.6 so that the ICRF will overlap and help prevent excessive cooling. |
| Sep 9 2009 03:02:50:680PM | 1090909023 | Matt Reinke | Good EDA H-mode. No McPherson trigger but PRAD higher than target.
NEXT: Steve wants to delay the start of D&E to 0.65. Move gas timing as well (0.45-0.65) increase pressure of Ne puff to 2 psi. |
| Sep 9 2009 03:14:34:213PM | 1090909024 | Matt Reinke | Looks like a coil problem caused the disruption
NEXT: Same shot. |
| Sep 9 2009 03:38:38:070PM | 1090909025 | Matt Reinke | Excellent shot. Early EDA quasi-steady with 2pi ~ 3.6 MW. On 023 it was 2.6 and 021 it was ~2.0. No McPherson due to gain problem, but qualitatively it seems we've made the goal of 1+ MW of Ne radiation.
NEXT: Switch to 0.4-0.5 sec pulse of 1.5 psi of 5:1 D2:Xe. Same target discharge. |
| Sep 9 2009 04:09:17:053PM | 1090909027 | Matt Reinke | Good steady H-mode seeded with xeon. Xe observable on McPherson as the 109 angstrom "blob".
NEXT: Change gas puff to 3:1 D2:Xe at 2 psi total. Keep same timing. |
| Sep 9 2009 04:18:24:877PM | 1090909028 | Matt Reinke | PRAD rise far too steep on this one and kills early due to cooling like 022
NEXT: Move to 4:1 D2:Xe at 1.5 psi total and increase puff length from 0.4-0.6 |
| Sep 9 2009 04:38:40:007PM | 1090909029 | Matt Reinke | PRAD rise still very steep and it almost didn't make it. This should suffice for the Xe infused plasmas.
NEXT: Switch to 4 psi of N2 in B-SIDE-LOWER. N2 puff from 0.4 to 0.8 seconds. |
| Sep 9 2009 04:52:22:790PM | 1090909030 | Matt Reinke | Spectroscopy shows Xe PRAD rise and AXUV emission is core localized when it should be edge for N2. Probably residual Xe in the plenum. Should flush multiple times after the run.
NEXT: Put 4 psi of N2 in B-SIDE-UPPER. Disable B-SIDE-LOWER and move same trigger to B-SIDE UPPER. |
| Sep 9 2009 05:09:12:143PM | 1090909031 | Matt Reinke | Plasma ran full length, but I'm not sure that we got much N2 in this shot. |
| Physics Operator Comments | |||
| Sep 9 2009 08:53:29:007AM | 1090909001 | Robert Granetz | For first shot, load seg 1 from seg 1 of 1090820033 (helium breakdown and startup) and seg 2 from seg 2 of 1090731003 (1 MA, 5.4 T). Adjust nl_04 to 0.6e20 m-2. There is no PG3 programming in seg 2. |
| Sep 9 2009 08:59:41:273AM | 1090909001 | Robert Granetz | Shot 01 -- No-power cycle to restart MDS shot cycle software. Next shot: |
| Sep 9 2009 09:53:27:797AM | 1090909002 | Robert Granetz | Shot 02 -- Another no-power cycle. Tom Fredian is still working out the software problems. |
| Sep 9 2009 10:13:34:630AM | 1090909003 | Robert Granetz |
Shot 03 -- Plasma. Disrupted at t=1.44 s. Helium plasma, with helium breakdown and startup. 1 MA, 5.4 T.
nl_04=0.6e20 m-2. There was a huge increase in soft x-rays at t=1.35 s, and a doubling on the
2pi diode. Looks like it was an injection. All 3 ICRF systems worked well, with the power ramping
up to 4 MW linearly during the flattop.
Next shot: no-power shot, at Josh's request. Raise ZXL 3 cm to get it above the tungsten tile row.
|
| Sep 9 2009 10:15:26:007AM | 1090909003 | Robert Granetz | Shot 04 -- No-power shot, at Josh's request. Next shot: back to plasmas |
| Sep 9 2009 10:34:40:327AM | 1090909005 | Robert Granetz | Shot 05 -- Fizzle (helium startup). Next shot: decrease pre-fill puff by 2 ms |
| Sep 9 2009 11:42:15:570AM | 1090909006 | Robert Granetz |
Shot 06 -- Plasma, full length, helium. 1 MA, 5.4 T, 0.6e20 m-2. Outer gap = 2.0 cm, inner
gap = 1.0 cm. Good RF ramp. Not sure if this had H-modes or not.
Next shot: decrease Ip to 0.7 MA
|
| Sep 9 2009 11:00:19:150AM | 1090909007 | Robert Granetz |
Shot 07 -- Plasma, full length, helium. 0.7 MA, 5.4 T, 0.5-0.6e20 m-2.
RF is running flawlessly.
Next shot: raise Ip to 1.2 MA
|
| Sep 9 2009 11:15:30:810AM | 1090909008 | Robert Granetz |
Shot 08 -- Plasma, disrupted at t=0.71 s, helium. Almost got to 1.2 MA. I think a low-Z injection
caused the disruption.
Next shot: increase nl_04 to 0.9e20 m-2.
|
| Sep 9 2009 11:24:01:593AM | 1090909009 | Robert Granetz | Shot 09 -- Fizzle. Next shot: increase Br0 offset by +0.3 mT (to +0.8 mT) |
| Sep 9 2009 11:41:24:367AM | 1090909010 | Robert Granetz |
Shot 10 -- Plasma, full length, helium. 1.2 MA, 5.4 T, 0.9e20 m-2. Good RF ramp. Outer gap = 2.0 cm,
inner gap = 1.0 cm
Next shot: set Ip to 1.0 MA
|
| Sep 9 2009 11:52:55:357AM | 1090909011 | Robert Granetz |
Shot 11 -- Plasma, full length, helium, 1.0 MA, 5.4 T, 0.8-0.9e20 m-2. Looks like a number of short little
H-modes.
Next shot: reduce Ip to 0.7 MA
|
| Sep 9 2009 12:19:42:680PM | 1090909012 | Robert Granetz |
Shot 12 -- Plasma, full length, helium, 0.7 MA, 5.4 T, 0.8-0.9e20 m-2. Several H-modes. Brian
reports that we destroyed Langmuir probe #6 in the outboard divertor.
Next shot: program somewaggling into ZXL to move the strike point around a little bit during the
shot; also increase Ip to 1.0 MA and nl_04 to 1.2e20 m-2
|
| Sep 9 2009 12:25:38:743PM | 1090909013 | Robert Granetz | Shot 13 -- Fizzle. No idea why. Next shot: decrease pre-fill puff by 2 ms |
| Sep 9 2009 12:46:25:377PM | 1090909014 | Robert Granetz |
Shot 14 -- Plasma, full length, helium, 1.0 MA, 5.4 T, 1.0e20 m-2.
Next shot: switch to the "double grazing" equilibrium that was developed for Jerry Hughes's recent
run (seg 2 of 1090902032). Load nl_04 gains from today's shot 14, since we're in helium.
Set nl_04 to 0.8e20 m-2. Remove PG3 programming in seg 2. Move RCUR out by 5 mm to decrease
outer gap from 3 cm to 2 cm, while leaving the inboard gap unchanged.
|
| Sep 9 2009 12:56:56:053PM | 1090909015 | Robert Granetz |
Shot 15 -- Fizzle, but it got to 100 kA and then went vertically (up). BP04_BC has a small offset
(15 mT), but that shouldn't have done much of anything.
Next shot: try again, no changes
|
| Sep 9 2009 01:21:41:593PM | 1090909016 | Robert Granetz |
Shot 16 -- Plasma, full length, helium 0.8 MA, "double grazing" equilibrium. Outer gap is 2 cm; inner
gap varies from 12 to 20 mm. D-port antenna didn't go.
End of MP565.
Next shot: begin MP569. Load shot 1090902011 (all segments). Copy ZXL "waggle" programming from shot
14 today in order to move strikepoint around a bit. Fill B-top and B-main with D2 (instead of
helium). Cool down the cryopump and get it ready for the coming shot. Increase the pre-fill
by 19 ms (to 40 ms) to compensate for the cryopump.
|
| Sep 9 2009 01:33:28:020PM | 1090909017 | Robert Granetz | Shot 17 -- Plasma, but disrupted at t=0.26 s, D2. Lots of runaways. Next shot: increase pre-fill another 10 ms (to 50 ms); increase PG3 programming in seg 1 |
| Sep 9 2009 01:48:07:667PM | 1090909018 | Robert Granetz |
Shot 18 -- Plasma, full length, D2, 0.8 MA, 5.4 T, 1.0e20 m-2. Many short H-modes. RF had lots
of faulting. Some early hard x-rays.
Next shot: no DPCS changes; repeat for better RF coupling
|
| Sep 9 2009 02:06:01:173PM | 1090909019 | Robert Granetz |
Shot 19 -- Plasma, disrupted at t=1.56 s. D2, 0.8 MA, cryopump on. Good RF performance. Prf=3.5 MW.
Two long EDA H-modes.
Next shot: enable B-side-lower, which has 3 psi of neon. Program pulse from t=0.3-0.5 s.
NINJA will also be on, puffing D2 starting at t=1.2 s
|
| Sep 9 2009 02:25:08:117PM | 1090909020 | Robert Granetz |
Shot 20 -- Plasma, full length, D2, 0.8 MA, 5.4 T. Some neon was puffed. Good RF, Prf=3.5 MW.
Several EDA H-modes.
Next shot: increase B-side-lower plenum pressure to 5 psi of neon, and program pulse from t=0.4 s
to 1.0 s
|
| Sep 9 2009 02:33:47:293PM | 1090909021 | Robert Granetz |
Shot 21 -- Plasma, nearly full length, D2, 0.8 MA. It turns out that I never enabled the B-side-lower
valve (oops). Three EDA H-modes. D-port turned off after t=0.96 s.
Next shot: return B-side-lower to 3 psi, and the gas pulse to 0.3-0.5 s
|
| Sep 9 2009 02:45:58:343PM | 1090909022 | Robert Granetz |
Shot 22 -- Plasma, disrupted at t=0.53 s. Looks like an injection, but I don't know if it was the
neon.
Next shot: reduce neon pressure down to 1.5 psi, and set pulse to t=0.4 to 0.6 s
|
| Sep 9 2009 03:05:49:133PM | 1090909023 | Robert Granetz | Shot 23 -- Plasma, full length, D2 with Ne puffing. Good RF, Prf=3.5 MW. One long EDA H-mode. Next shot: increse Ne plenum pressure to 2 psi and move pulse length to t=0.45 to 0.65 s |
| Sep 9 2009 03:26:58:673PM | 1090909024 | Robert Granetz |
Shot 24 -- Plasma, disrupted at t=0.86 s. Weird Ip trace. EF1U crowbarred, causing the disruption.
Neon was puffing, but it's not to blame. Pickup from the RF might be to blame.
Next shot: move neon pulse back to t=0.4-0.6 s
|
| Sep 9 2009 03:36:09:393PM | 1090909025 | Robert Granetz |
Shot 25 -- Plasma, disrupted at t=1.57 s, D2, 0.8 MA, neon puffing. Good RF, Prf=3.5 MW.
Next shot: change plenum gas to a mixture of D2 and xenon (1.25 psi D2 + 0.25 psi Xe);
set B-side-lower gas pulse to t=0.4-0.5 s
|
| Sep 9 2009 03:49:20:993PM | 1090909026 | Robert Granetz | Shot 26 -- Fizzle. Cryopump started to regenerate just before the shot. Next shot: repeat, no changes |
| Sep 9 2009 04:08:02:377PM | 1090909027 | Robert Granetz |
Shot 27 -- Plasma, full length, D2, 0.8 MA. Mixture of D2 and Xe puffed through B-side-lower. Good RF,
Prf=3.5 MW. One long EDA H-mode.
Next shot: increase Xe fraction in the B-side-lower plenum; keep same pulse programming
|
| Sep 9 2009 04:21:42:593PM | 1090909028 | Robert Granetz | Shot 28 -- Plasma, but disrupted at t=0.60 s. Matt Next shot: tweak B-side-lower plenum gas mix and pressure; increase pulse to t=0.4-0.6 s. |
| Sep 9 2009 04:39:47:960PM | 1090909029 | Robert Granetz |
Shot 29 -- Plasma, nearly full length, D2 with Xe puffing. Good RF performance; Prf=3.5 MW.
One long EDA H-mode.
Next shot: change B-side-plenum to 4 psi of N2; set pulse from t=0.4 to 0.8 s;
reduce pre-fill puff by 3 ms (to 47 ms)
|
| Sep 9 2009 04:53:10:167PM | 1090909030 | Robert Granetz |
Shot 30 -- Plasma, but disrupted at t=0.60 s. D2 with N2 puffing. May have been too much N2.
Matt claims that there's still some xenon coming out of the B-side-lower plenum
Next shot: disable B-side-lower; fill B-side-upper with 4 psi of N2; enable B-side-upper; copy
programming from B-side-lower to B-side-upper; zero B-side-lower; reduce pre-fill by
2 ms (to 45 ms)
|
| Sep 9 2009 05:01:59:250PM | 1090909031 | Robert Granetz | Shot 31 -- Plasma, full length, D2 with N2 puff. Excellent Rf; Prf=3.5 MW. End of run |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:54:05:817AM | Plasma | Bad | State fault |
| 2 | 09:25:08:923AM | Plasma | Bad | Critical failure |
| 3 | 10:01:56:593AM | Plasma | Ok | |
| 4 | 10:15:31:913AM | Test | Ok | Cycle test |
| 5 | 10:28:05:353AM | Plasma | Ok | |
| 6 | 10:40:43:233AM | Plasma | Ok | |
| 7 | 10:53:20:253AM | Test | Bad | |
| 8 | 11:07:22:040AM | Plasma | Ok | |
| 9 | 11:20:00:390AM | Plasma | Ok | |
| 10 | 11:32:43:067AM | Plasma | Ok | |
| 11 | 11:47:05:090AM | Plasma | Ok | |
| 12 | 12:02:34:830PM | Plasma | Ok | |
| 13 | 12:21:13:257PM | Plasma | Ok | |
| 14 | 12:33:53:903PM | Plasma | Ok | |
| 15 | 12:49:30:050PM | Plasma | Ok | |
| 16 | 01:02:27:947PM | Plasma | Ok | |
| 17 | 01:27:12:593PM | Plasma | Ok | |
| 18 | 01:39:50:677PM | Plasma | Ok | |
| 19 | 01:52:42:747PM | Plasma | Ok | |
| 20 | 02:12:14:660PM | Plasma | Ok | |
| 21 | 02:25:29:820PM | Plasma | Ok | |
| 22 | 02:39:07:903PM | Plasma | Ok | |
| 23 | 02:52:16:720PM | Plasma | Ok | |
| 24 | 03:05:07:400PM | Plasma | Bad | EF1 IOC or Other Fault |
| 25 | 03:28:06:453PM | Plasma | Ok | |
| 26 | 03:45:46:867PM | Plasma | Ok | |
| 27 | 03:58:54:340PM | Plasma | Ok | |
| 28 | 04:13:31:510PM | Plasma | Ok | |
| 29 | 04:29:10:347PM | Plasma | Ok | |
| 30 | 04:44:21:400PM | Plasma | Ok | |
| 31 | 04:57:03:717PM | Test | Bad | |
| 32 | 05:16:20:833PM | Test | Ok | |
| 33 | 05:33:47:683PM | Test | Ok | |
| 34 | 06:03:07:180PM | Test | Bad | |
| 35 | 06:15:01:620PM | Test | Bad | |
| System Availability | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Sep 9 2009 08:53:38:037AM | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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