| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Brian Labombard,Matt Reinke |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Sam Pierson,Bill Byford,Ed Fitzgerald |
| Engineering Operator Run Comment |
| MP547 High-field side SOL flow momentum coupling experiments Session lea |
| Session Leader Plans |
| Entered: Apr 10 2008 01:50:57:193PM |
| Author: Matt Reinke |
| MP 534: Foil/AXUV Bolometer Calibration in Helium (1/2-day PM)
SL: ML Reinke PO: R. Granetz The main purpose of this experiment is create radiative plasmas with a variety of impurities to cross-calibrate the foil and AXUV bolometers. A second goal is to evaluate the effectiveness of N V emission in polluting the edge lyman alpha measument. Diagnostics: All Te and n_e profile diagnostics that are working (GPC1 and GPC2, TCI, FRC). All impurity spectroscopy that are working (HIREXSR, NeSOX, bolometry, VUV, CHROMEX) DNB: 100 ms on 100 ms off at max beam current. Cryopump: Needed on first shot ICRF: 0.4-1.5 seconds @ 4+ MW (first few shots to tune up) Plan (all gas puffs use B-SIDE lower): A) establish USN ICRF heated L-mode like 1080326003 and bring ICRF up to max power 0.4-1.5 seconds (below H-mode threshold). No gas puffing. Measure Mo-dominated emissivity from foils and AXUV. Lower nl04 to 0.8 if still getting a large offset on edge foil channel. B) turn on Ne gas puff from 0.3-1.3 seconds at 1.5 psi. Adjust pressure as necessary to get steady, radiative discharge. C) switch to Ar gas puff at 1.5 psi. Adjust pressure as necessary to get steady, radiative discharge. D) switch to Kr gas puff at 0.5 psi. Adjust pressure as necessary to get steady, radiative discharge. ****CELL ACCESS TO SWITCH GAS BOTTLES IF ON SCHEDULE**** E) switch to Xe gas puff at 0.25 psi. Adjust pressure as necessary to get steady, radiative discharge. F) switch to N gas puff at 4.0 psi. Adjust pressure as necessary to get steady, radiative discharge. |
| Entered: Apr 10 2008 04:57:49:503PM |
| Author: Brian Labombard |
| Run Plan for 1080411 MP#532 ""High-field side SOL flow momentum coupling experiments"" Goal The purpose of these experiments is to critically test the hypothesis that it is the high-field side SOL flows which are specifically responsible for coupling parallel momentum into the confined plasma, causing the toroidal rotation of the core to change according to magnetic x-point topology. Approach We will run an USN plasma similar to 1080313009 and systematically vary the gap between the inner nose and the last closed flux surface over the range which typically contains the bulk of the SOL flow (~5 mm when mapped to the outboard midplane). This would be done by varying the horizontal location of the lower x-point by perhaps a few cm. We would like to run discharges with steady 'nose gaps' which map to 6, 4, 2, 0 and -2 mm at the outboard midplane and observe changes in the SOL flows (via WASP, FSP, ASP probes), edge toroidal rotation (via gas-puff and DNB based CXRS) and core toroidal rotation (via HIREX family). These discharges would be repeated until the scanning probes record clean profiles up to the separatrix. We would then run a few discharges where the 'nose gap' is scanned through this range (6 to -2 mm) and back over a ~1 s time range and monitor the slow time response of the edge and core rotations. The density would be held at the 'sweet spot' for the coupling of SOL flows across the separatrix (NL04 ~ 0.8e20 m-2). If time allows, we would also consider running a couple of 'fast-jogs' in inner nose gap to track the temporal response of momentum coupling from the HFS SOL. Key diagnostics for this study are: ASP, FSP and WASP scanning probes, GPI and DNB-based CXRS plasma flow measurements, HIREX and HIREX Sr. We will need to optimize the targeting for all scanning probes such that they record the electron pressure and plasma flow profiles across the separatrix. It is particularly important that the probes are inserted deep enough to resolve the cross-field flow shear layer. Diagnostic Setup Ninja filled with 10 psi D2 Argon enabled with 150 ms pulse width, turn-on at 0.3 s. No cryopump, no ICRF, no LHRF, yes DNB. Shot Plan Reload from shot#1080313009. Program Bt flat at 5.4 tesla, NL04 = 0.8e20 m^-2. Program a linear ramp increase in RXL, starting from its presently programmed value minus 1 cm at 0.6 s and increasing by 4 cm at 1.0s. Program a subsequent linear ramp decrease in RXL, such that it returns to the presently programmed value minus 1 cm by 1.4s. This shot will allow us to record the relationship between RXL program and inner-nose gap width. We can use the rho-mapping on inner divertor probe 14 (\edge::top.probes.fmp.id_13.p1:rho) to follow the location of the nose mapped to the outer midplane. Shots 1-3 Optimize RXL ramp discharge. Shots 4-13 Program a constant value of 'nose-gap' and do a shot-to-shot 'nose-gap' scan, with two shots at each value: Shots 4,5: 6 mm Shots 6,7: 4 mm Shots 8,9: 2 mm Shots 10,11: 0 mm Shots 12,13: -2 mm Shots 14-16 If needed, return to swept RXL shot (shot#3). Optimize probe scans and CXRS diagnostic data. Shots 17-18 Attempt to jog the inner nose gap a few times during the shot from 6 mm to -2 mm and back, tracking the flow behavior on CXRS and HIREX systems. 0.7 s - Jog inner nose from 6 to -2 mm 0.9 s - Jog inner nose from -2 to 6 mm 1.1 s - Jog inner nose from 6 to -2 mm 1.3 s - Jog inner nose from -2 to 6 mm |
| Physics Operators Plans |
| Entered: Apr 11 2008 01:59:32:313PM |
| Author: Robert Granetz |
Engineering setup for Friday 11 Apr 2008
MP547 High-field side SOL flow momentum coupling experiments (am)
MP534 Bolometry calibration in helium plasmas (pm)
Session leaders: B. LaBombard/N. Smick (am); M. Reinke (pm)
Physics operator: R. Granetz
Overnight ECDC in HELIUM and bake at 60 C.
Run will start at 09:00 and end at 17:00.
Power systems as on 1080313009 (0.8 MA, 5.4 T, lower null)
A-coil configuration: +Dtop -Dbot -Jtop +Jbot; Enabled (standard
configuration)
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
NOTE on gas setup: for the 2nd half of the day we will run helium plasmas,
so the C-side plenum will have to be purged and filled with helium at
midday.
Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, DNB, Z-bolo
Torvac setup: keep gate valves open during PULSE
Specific diagnostics: Langmuir probes, GPI, CXRS, DNB, HIREX
-------------------------------------------------------------------------------
ICRF Setup: am: no / pm: yes, 4+ MW
LH Setup: no
DNB: yes
Cryopump: am: no / pm: yes
-------------------------------------------------------------------------------
Run plan:
For first 1/2 of the day:
Load 1080313009 seg 3 into seg 3, and load 1080410021 seg 1 into seg 1.
Reprogram Btor to be steady 5.4 T.
Set nl_04 to 0.8e20 m-2.
Program 150 ms argon puff (t=0.30-0.45).
Sweep RXL during the shot from -0.06 to -0.02 and back again.
Monitor N2 on RGA and adjust LN2 cooling rate to avoid N2 leaks.
For the 2nd 1/2 of the day:
Purge C-side plenum and refill with helium.
Fill B-side-lower plenum with neon at 1.5 psi. DISABLE HYBRID CONTROL.
Turn on cryopump.
Get ICRF ready.
Increase pre-fill puff to 55 ms (to compensate for cryopump).
Load 1080116014 seg 4 into seg 4 (1 MA, 5.4 T, upper null).
Program nl_04 to 1.0e20 m-2.
Monitor N2 on RGA and adjust LN2 cooling rate to avoid N2 leaks.
MONITOR RUNAWAYS.
|
| Session Leader Summaries |
| Entered: Apr 11 2008 12:27:41:300PM |
| Author: Kenneth Marr |
| Ninja B16 puff moved to .9s for 140ms.
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| Entered: Apr 11 2008 04:26:08:000PM |
| Author: Kenneth Marr |
| Ninja disabled. |
| Entered: Apr 11 2008 07:09:09:097PM |
| Author: Matt Reinke |
| The run went slow due to cryo and vessel cooling delays and a late start to help Brian get some more data. The RF performed GREAT getting two shots with 5.5 MW and 1.1 second pulses.
We started with a few conditioning shots to degas the deuterium. LYMID brightness went from 10 kW on 017 to 3 kW on 019 down ~1 kW after that. Neutron rate was measurable and with the ion temperature from moly, we should be able to get an estimate of the deuterium fraction. While doing some condition we puffed 1.5 psi Ne on 019,020,022 but did not see significant Ne like the 1.5 psi pulse from 1080326004 on spectroscopy. The bottles were checked after the run and were Ne, but I moved to prevent wasting time adjusting the plenum pressure. 023 had argon at 1.45 psi 024 had argon at 2.6 psi 025 had krypton at 0.8 psi 027 had krypton at 1.6 psi The moly radiation was really high on all these shots compared to doing highly radiative discharges in deuterium. Shot 021 had 4.5 MW ICRF, 1.0 MW of Ohmic and still didn't go into H-mode (USN, though). I got good data and did not break the machine! |
| Entered: Apr 11 2008 11:01:04:220PM |
| Author: Brian Labombard |
| Depsite the fact that this run was plagued by many computer delays, it was actually quite successful. The first half was slated for MP#547 'High-field side SOL flow momentum coupling experiments'. Unfortunately, by 2:00 pm we had achieved only nine good shots. (Thanks to Matt for allowing us to continue beyond the nominal 1:00 pm handoff.) But, these shots proved very important as they allowed us to scope-out the response of the core plasma to changes in the flows on the high-field side. First we started with a slow sweep of RXL (shots 4 and 6), causing the USN plasma to vary its spacing between the LCFS and the inner divertor nose tiles. Then we dialed up some fixed 'nose-gaps', including cases with 0, 2.5, 5, 6 and 10 mm spacings, while recording the flow profiles with the scanning probes (ASP, FSP and WASP). The variable nose-gap spacing had the desired effect on the high-field SOL flows. With zero nose-gap the parallel flows on the HFS became stagnant and the local pressure profile exhibited a very sharp fall-off. However, the nose-gap modulation produced no clear change in the toroidal plasma rotation as inferred from HIREX (John Rice) or the outer CXRS profile data (Rachael). At first, we thought that the confined plasma was indeed responding to HFS flows (shots 7, 8, 12, 13), with more counter-current rotation suggested as the nose-gap got bigger. But, then we repeated the zero nose gap (shot 14) and 10 mm gap (shot 15) cases and got an inconsistent result. (Note: GPI CXRS data still needs to be analyzed.) Taken together, these data indicate that there is no systematic dependence of core toroidal rotation on whether the near-sonic SOL flows pass along the HFS leg. Although we were hoping to see a clear dependence here, the negative result is very important. It tells us that the SOL momentum does NOT couple to the confined plasma along the HFS leg; if such a coupling mechanism is occurring, it is happening elsewhere in poloidal angle. One possibility is that momentum is coupling into the plasma as the SOL flows circle around the 'crown' of the discharge. In this case, the nose-gap would have little impact. In retrospect, we should have run some double-null discharges and compared the core toroidal rotation in these to the zero nose-gap cases obtained today. Perhaps we would have seen a difference in core toroidal rotation, indicated that the 'crown' flow is indeed the principal driver. Stay tuned, I see another MP in the works to investigate this stuff...
01 - no power 02 - fizzle 03 - no power 04-USN nose-sweep, Ip=0.8, Bt=5.4, NL04=0.85 and rising, no probes scanning 05- early disruption 06-USN nose-sweep, Ip=0.8, Bt=5.4, NL04=0.8, SP @ 0.65, 0.85, 1.05s, ASP(+6), FSP(+14), WASP(rho=0) 07-USN with nose gap=0, Ip=0.8, Bt=5.4, NL04=0.82, SP @ 0.65, 0.85, 1.05s, ASP(+6), FSP(+14), WASP(rho=0) 08-USN with nose gap=0, Ip=0.8, Bt=5.4, NL04=0.82, SP @ 0.7, 0.9, 1.1s, ASP(+8.5), FSP(+20), WASP(rho=0) 09-USN with nose gap=5 mm, Ip=0.8, Bt=5.4, NL04=0.8, SP @ 0.7, 0.9, 1.1s, ASP(+8.5), FSP(+19), WASP(rho=0) 10-no power 11-no power 12-USN with nose gap=2.5 mm, Ip=0.8, Bt=5.4, NL04=0.83, SP @ 0.7, 0.9, 1.1s, ASP(+8.5), FSP(+19), WASP(rho=0) 13-USN with nose gap=10 mm, Ip=0.8, Bt=5.4, NL04=0.8, SP @ 0.7, 0.9, 1.1s, ASP(+8.5), FSP(+15), WASP(rho=0) 14-USN with nose gap=0 mm, Ip=0.82, Bt=5.4, NL04=0.8, SP @ 0.7, 0.9, 1.1s, ASP(+8.5), FSP(+22), WASP(rho=0) 15-USN with nose gap=6 mm, Ip=0.8, Bt=5.4, NL04=0.8, SP @ 0.7, 0.9, 1.1s, ASP(+8.5), FSP(+20), WASP(rho=0) |
| Physics Operator Summaries |
| Entered: Apr 11 2008 05:28:35:737PM |
| Author: Robert Granetz |
Run summary for Friday 11 Apr 2008
MP547 High-field side SOL flow momentum coupling experiments (am)
MP534 Bolometry calibration in helium plasmas (pm)
Session leaders: B. LaBombard (am); M. Reinke (pm)
Physics operator: R. Granetz
The tokamak, ICRF, DNB, and cryopump systems all worked quite well today.
However, we lost a lot of time in the morning to computer problems. The
first 1/2-day experiment involved changing the gap to the inboard nose to
look at SOL flows, and this was quite successful. The second 1/2-day
experiment involved helium plasmas, very high power ICRF, and impurity gas
puffing (neon, argon). The plasmas ran well, and the ICRF performed
incredibly well (5.6 MW for 1.1 s with no faults on any antenna), but there
was no spectroscopic confirmation of neon in the plasma. Switching to
argon gave good argon signals. Unlike the previous time that this MP was
tried, we didn't have any problems with relativistic runaways, or with
fizzles.
Scorecard: 21 plasmas
0 duds
2 fizzles
0 power supply tests
6 no-power MDS shot cycles
--------------
Total: 27 shot cycles
Note: the total number of shot cycles did not match the final shot counter
number because a number of shot cycles didn't register properly.
|
| Session Leader Comments | |||
| Apr 11 2008 10:59:48:137AM | 1080411004 | Brian Labombard | 04-USN nose-sweep, Ip=0.8, Bt=5.4, NL04=0.85 and rising, no probes scanning |
| Apr 11 2008 12:09:22:410PM | 1080411007 | Brian Labombard | 07-USN with nose gap=0, Ip=0.8, Bt=5.4, NL04=0.82, SP @ 0.65, 0.85, 1.05s, ASP(+6), FSP(+14), WASP(rho=0) |
| Apr 11 2008 12:22:13:360PM | 1080411008 | Brian Labombard | 08-USN with nose gap=0, Ip=0.8, Bt=5.4, NL04=0.82, SP @ 0.7, 0.9, 1.1s, ASP(+8.5), FSP(+20), WASP(rho=0) |
| Apr 11 2008 01:05:37:690PM | 1080411009 | Brian Labombard | 09-USN with nose gap=5 mm, Ip=0.8, Bt=5.4, NL04=0.8, SP @ 0.7, 0.9, 1.1s, ASP(+8.5), FSP(+19), WASP(rho=0) |
| Apr 11 2008 01:23:08:250PM | 1080411012 | Brian Labombard | 12-USN with nose gap=2.5 mm, Ip=0.8, Bt=5.4, NL04=0.83, SP @ 0.7, 0.9, 1.1s, ASP(+8.5), FSP(+19), WASP(rho=0) |
| Apr 11 2008 01:42:27:800PM | 1080411013 | Brian Labombard | 13-USN with nose gap=10 mm, Ip=0.8, Bt=5.4, NL04=0.8, SP @ 0.7, 0.9, 1.1s, ASP(+8.5), FSP(+15), WASP(rho=0) |
| Apr 11 2008 01:42:54:487PM | 1080411014 | Brian Labombard | 14-USN with nose gap=0 mm, Ip=0.82, Bt=5.4, NL04=0.8, SP @ 0.7, 0.9, 1.1s, ASP(+8.5), FSP(+22), WASP(rho=0) |
| Apr 11 2008 02:08:44:000PM | 1080411015 | Brian Labombard | 15-USN with nose gap=6 mm, Ip=0.8, Bt=5.4, NL04=0.8, SP @ 0.7, 0.9, 1.1s, ASP(+8.5), FSP(+20), WASP(rho=0) |
| Apr 11 2008 02:12:55:550PM | 1080411016 | Matt Reinke | Delay on cooling the cryo so we'll take a shot w/o it with 2 MW IRCF to start degassing the deuterium from the walls.
McPherson lookinng at 303 He II line, MCP fiber in CHROMEX to get the branching ratio cross-calib. Early disruption before RF and there was no impurity puff. The machine hates me. NEXT: cool down the cryo and try to get fiducial again. |
| Apr 11 2008 02:46:29:597PM | 1080411017 | Matt Reinke | Good shot. Still lingering D2. LYMID at 10 kW/m^2. Neutron Rate at 1.5e12
NEXT: Increase RF to 3 MW and continue outgassing. |
| Apr 11 2008 03:10:07:860PM | 1080411018 | Matt Reinke | Good shot. RF is clean but deuterium is still high. Continue outgassing but test out neon.
NEXT: Increase RF to 4.0 MW and put in test pulse of neon (1.5 psi from 0.5-0.8 seconds) |
| Apr 11 2008 03:31:03:080PM | 1080411019 | Matt Reinke | Good shot. The neutron rate/MW is coming down and the LYMID is coming down.
NEXT: Repeat with RF 4.5 MW |
| Apr 11 2008 03:50:05:517PM | 1080411020 | Matt Reinke | Disruption. No evidence of Ne on active CXRS or passive edge cameras or McPherson. RF a little trippy.
NEXT: Repeat w/o puff |
| Apr 11 2008 04:01:17:410PM | 1080411021 | Matt Reinke | Great RF shot, went into rampdown just fine.
NEXT: Add 1.5 psi Ne puff from 0.3-0.8 |
| Apr 11 2008 04:29:50:487PM | 1080411022 | Matt Reinke | Great RF again. Radiated power nice and steady. Still not seeing Ne on spectroscopy, but I don't want to monkey around with the pressure if something is wrong. Moving to Ar where it's easier to see the PRAD increase.
NEXT: Move to 1.45 psi argon |
| Apr 11 2008 04:32:57:910PM | 1080411023 | Matt Reinke | Great shot. Clearly see the Ar come in and out on the HIREX. Doesn't seem to perturb the PRAD as much, so the moly is dominating the PRAD. More argon!
NEXT: Increase pressure to 2.6 psi from 0.3-1.1 and increase RF to 5 MW |
| Apr 11 2008 04:59:32:847PM | 1080411024 | Matt Reinke | Good shot. Minor RF trips. Argon x3 higher than last shot, but moly still dominating.
NEXT: RF to 5.5 MW and moving to 0.8 psi of Kr with same pulse length. |
| Apr 11 2008 05:11:49:143PM | 1080411025 | Matt Reinke | Great shot, probably an RF input power record. Seeing Kr on the McPherson.
NEXT: increase Kr pressure to 1.6 psi. |
| Apr 11 2008 05:11:51:110PM | 1080411025 | Robert Granetz | Great shot, probably an RF input power record. Seeing Kr on the McPherson.
NEXT: increase Kr pressure to 1.6 psi. |
| Physics Operator Comments | |||
| Apr 11 2008 08:40:04:037AM | Robert Granetz | Loaded pre-programmed saved shot 1080411000 from /home/granetz/pcs_scratch/. Enable B-side-lower valve (Ar, 1 psi) Last night's ECDC was in D2. We're all set up to start MP547 -- High-field SOL flow momentum coupling experiments (Smick/LaBombard) | |
| Apr 11 2008 04:56:35:127PM | 1080411001 | Robert Granetz | Shot 01 -- No-power shot cycle due to computer problems. |
| Apr 11 2008 09:24:22:397AM | 1080411002 | Steve Wolfe | Shot#2 fizzled, Bob had the pre-puff set for cryopump Changed pg4 to 23msec for shot#3 Bob still AWOL |
| Apr 11 2008 09:31:08:490AM | 1080411002 | Robert Granetz | Shot 02 -- Fizzle. I guess when I was setting up both 1/2-day runs in DPCS last night, I left segment 1 with the pre-fill set for Matt's run, which will have the cryopump, and not for Brian's, which doesn't have the cryopump. (Last evening there were doubts about whether we would start with Brian's run or Matt's run.) Next shot: Steve reduced the pre-fill back to 23 ms. |
| Apr 11 2008 09:45:30:427AM | 1080411003 | Robert Granetz | Shot 03 -- No-power shot, again because of computer problems. |
| Apr 11 2008 10:09:14:067AM | 1080411003 | Robert Granetz | Shot 03 -- No-power shot again; also shot 03 again. Next shot: I don't even know what the shot number will be. |
| Apr 11 2008 10:38:42:537AM | 1080411004 | Robert Granetz | Shot 04 -- Plasma. The gap scan to the inboard nose worked very well! Ip=0.8 MA, Bt=5.4 T, nl_04=0.85-1.0e20 m-2. Next shot: decrease nl_04 to 0.7e20 m-2 to try and get rid of a marfe |
| Apr 11 2008 10:54:07:653AM | 1080411005 | Robert Granetz | Shot 05 -- Plasma, but disrupted very early (0.22 s) due to an injection. Next shot: try again; no DPCS changes |
| Apr 11 2008 11:15:19:410AM | 1080411006 | Robert Granetz | Shot 06 -- No-power shot due to computer problems. I don't think this cycle registered as a shot, so we'll probably have shot 6 again. Next shot: reduce argon puff to 100 ms (from 150 ms) |
| Apr 11 2008 11:52:18:970AM | 1080411006 | Robert Granetz | Shot 06 -- Plasma. Good shot. Shot 6 again. Scanned gap to inboard nose. Marfe was less of a problem. nl_04=0.8e20 m-2. Next shot: changed to fixed equilibrium mode; set RXL at -0.055 m from t=0.65 to 1.35 s (this should be just barely limited on the inboard nose) |
| Apr 11 2008 12:02:28:533PM | 1080411007 | Robert Granetz | Shot 07 -- Plasma. Good shot. Limited on inboard nose the entire flattop, and also very close to being upper null...Brian's happy. Next shot: no DPCS changes; deeper probe scans |
| Apr 11 2008 12:17:35:860PM | 1080411008 | Robert Granetz | Shot 08 -- Plasma. Good shot. Limited on inboard nose, similar to previous shot. Next shot: go to next inboard nose gap setting (5 mm), so set RXL to -0.035 m for the entire flattop |
| Apr 11 2008 12:33:29:487PM | 1080411009 | Robert Granetz | Shot 09 -- Plasma. Good shot. Upper null for the entire flattop. Gap to inboard nose was about 5 mm, as desired. Next shot: change RXL to -0.045 m (about 2.5 mm gap) |
| Apr 11 2008 12:53:11:800PM | 1080411010 | Robert Granetz | Shot 10 -- Failed shot cycle. Entry into PULSE was announced, but nothing happened. Shot counter did not advance either. Next shot: no-power shot cycle to test computers |
| Apr 11 2008 12:54:10:550PM | 1080411011 | Robert Granetz | Shot 11 -- No-power shot cycle to test computers. Next shot: Try again for shot 10 programming, which is a gap of 2.5 mm. |
| Apr 11 2008 01:20:02:110PM | 1080411012 | Robert Granetz | Shot 12 -- Plasma. Good shot. Inboard nose gap is 2.5 mm, as desired. Next shot: go to 1 cm gap to inboard nose; set RXL to -0.02 m |
| Apr 11 2008 01:31:52:423PM | 1080411013 | Robert Granetz | Shot 13 -- Plasma. Good shot. Inboard nose gap is 1 cm for the entire flattop, as desired. Next shot: go back to hard limited on the inboard nose; set RXL to -0.060 m |
| Apr 11 2008 01:39:47:580PM | 1080411014 | Robert Granetz | Shot 14 -- Plasma. Good shot. Limited on inboard nose for the entire flattop. Next shot: go back to 5 mm gap, as on shot 9 (RXL to -0.035 m) |
| Apr 11 2008 02:05:30:360PM | 1080411015 | Robert Granetz | Shot 15 -- Plasma. Good shot. Inboard nose gap is 5 mm, as desired. End of MP547 Start MP534: bolometry calibration in helium plasmas w/impurity puffing Next shot: fill C-side plenum with 40 psi helium; fill B-side-lower with 1.5 psi neon; set hybrid disabled do not turn on cryopump yet; keep pre-fill at 23 ms; set ICRF on; turn off segment 3, turn on segment 4 (1 MA, 5.4 T, 1.0e20 m-2, upper null) |
| Apr 11 2008 02:37:29:283PM | 1080411016 | Robert Granetz | Shot 16 -- Plasma, but disrupted very early due to an injection. There were no hard x-rays. The neon valve is NOT enabled. Next shot: turn on cryopump; set pre-fill to 55 ms to compensate for cryopump; keep neon valve disabled; load seg 4 from 1080326003 seg 4 (which has nl_04=0.9e20 m-2) |
| Apr 11 2008 02:48:48:250PM | 1080411017 | Robert Granetz | Shot 17 -- Plasma. Good shot. Helium plasma, 1 MA, 5.4 T, 1.0e20 m-2, upper null. Prf=2.2-2.3 MW. Cryopump was on. Next shot: no DPCS changes; increase Prf to 3 MW; cryopump on; still no neon puffing yet |
| Apr 11 2008 03:10:10:643PM | 1080411018 | Robert Granetz | Shot 18 -- Plasma. Disrupted in rampdown. Prf=3.0 MW. Density starts out a little high. Next shot: no DPCS changes; enable neon puff, set for t=0.5-0.8 s; increase Prf to 4 MW; cryopump on again |
| Apr 11 2008 03:31:22:360PM | 1080411019 | Robert Granetz | Shot 19 -- Plasma. Disrupted at end of flattop. Looks like the neon puffing raises the density. Prf=4.1 MW for 1.1 s. Cryopump on. No hard x-rays. No spectroscopic evidence of neon, but the valve did get the pulse. Next shot: no DPCS changes; purge B-side-lower and refill with 1.5 psi of neon; raise Prf to 4.5 MW |
| Apr 11 2008 03:46:05:313PM | 1080411020 | Robert Granetz | Shot 20 -- Plasma. Disrupted at t=0.68 s. Prf=4.5 MW. Next shot: disable B-side-lower neon puff; no other changes |
| Apr 11 2008 04:01:12:347PM | 1080411021 | Robert Granetz | Shot 21 -- Plasma. Full-length shot. No neon puff. Some early runaways. Prf=4.6 MW for 1.1 s...really nice ICRF performance. Next shot: turn B-side-lower back on; increase neon puff to 0.5 s (t=0.3 to 0.8 s) |
| Apr 11 2008 04:18:14:080PM | 1080411022 | Robert Granetz | Shot 22 -- Plasma. Good shot. Nearly full length, with the neon puff enabled. Prf=4.6 MW for 1.1 s without a single fault on any antenna. Ugly startup. Next shot: increase pre-fill by 4 ms; change B-side-lower to 1.5 of argon |
| Apr 11 2008 04:34:27:673PM | 1080411023 | Robert Granetz | Shot 23 -- Plasma. Full-length. Prf=4.6 MW for 1.1 s, no faults. Early hard x-rays. Next shot: increase argon puff to 0.8 s (t=0.3-1.1 s); increase argon plenum pressure to 2.5 psi; increase Prf to 5 MW; add 3 ms to pre-fill |
| Apr 11 2008 05:00:22:283PM | 1080411024 | Robert Granetz | Shot 24 -- Plasma. Disupted in rampdown. Argon puffed. Prf=5.1 MW for 1.1 s. Startup still was bad, with early hard x-rays. Next shot: add 3 more ms to pre-fill; change B-side-plenum to 0.8 psi of krypton |
| Apr 11 2008 05:10:51:457PM | 1080411025 | Robert Granetz | Shot 25 -- Plasma. Disrupted in rampdown. Prf=5.6 MW for 1.1 s with no faults on any antennas. The ICRF really loves helium plasmas. Krypton is seen. Next shot: add 2 more ms to pre-fill; increase B-side-plenum pressure to 1.3 psi of Kr |
| Apr 11 2008 05:22:21:660PM | 1080411026 | Robert Granetz | Shot 26 -- Fizzle. Multiple spikes on the carbon II signal. Previous startup was not bad, so I'm surprised by this. Next shot: add 2 more ms to pre-fill; at Steve Wolfe's suggestion also increase RCUR offset to 1800 (from 1000) |
| Apr 11 2008 05:30:27:860PM | 1080411027 | Robert Granetz | Shot 27 -- Plasma. Disrupted at end of flattop. Krypton puffed. Prf=5.6 MW for 1.1 s. Startup was still bad, with early hard x-rays. End of run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 2 | 09:17:46:507AM | Plasma | Ok | |
| 3 | 10:06:40:100AM | Test | Bad | |
| 4 | 10:25:30:270AM | Plasma | Ok | |
| 5 | 10:47:22:407AM | Plasma | Ok | |
| 6 | 11:02:55:030AM | Plasma | Ok | |
| 7 | 11:54:32:313AM | Plasma | Ok | |
| 8 | 12:07:21:627PM | Plasma | Ok | |
| 9 | 12:19:52:347PM | Plasma | Ok | |
| 11 | 12:53:35:923PM | Plasma | Bad | No Power Shot |
| 12 | 01:06:49:767PM | Plasma | Ok | |
| 13 | 01:20:59:033PM | Plasma | Ok | |
| 14 | 01:33:28:987PM | Plasma | Ok | |
| 15 | 01:52:16:267PM | Plasma | Ok | |
| 16 | 02:08:41:207PM | Plasma | Ok | |
| 17 | 02:41:01:190PM | Plasma | Ok | |
| 18 | 02:58:01:767PM | Plasma | Ok | |
| 19 | 03:13:09:080PM | Plasma | Ok | |
| 20 | 03:32:35:707PM | Plasma | Ok | |
| 21 | 03:49:44:987PM | Plasma | Ok | |
| 22 | 04:08:18:457PM | Plasma | Ok | |
| 23 | 04:25:18:800PM | Plasma | Ok | |
| 24 | 04:45:53:173PM | Plasma | Ok | |
| 25 | 05:00:48:487PM | Plasma | Ok | |
| 26 | 05:13:14:563PM | Plasma | Ok | |
| 27 | 05:25:37:750PM | Plasma | Ok | |
| System Availability | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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