| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Greg Wallace |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Bill Cochran,Andy Pfeiffer,Ed Fitzgerald |
| Engineering Operator Run Comment |
| MP641 - LHCD density limit in H and He discharges |
| Session Leader Plans |
| Entered: Feb 4 2011 01:37:13:353PM |
| Author: Greg Wallace |
| SL plan for 1110207
MP641: LHCD density limit in H and He discharges SL: G. Wallace PO: R. Granetz Required systems: TCI, TS, fixed divertor probes, reciprocating probes, HXR, non-thermal ECE, GPI, SOL reflectometer, O-mode LH reflectometer, X-mode reflectometer, DNB, MSE, LH spectrum analyzer. Over the weekend ECDC in He. LH setup: 90 deg phasing, 80-160 kW/klystron, launcher 0.1 mm behind limiter (1269 counts), pulse 0.8-1.3 s. Reference shot for physop: 1100901005 AM (He): 1. Establish upper null He discharge at 5.4 T, 800 kA. Take a few shots to establish high He/low D plasma. Reference shot 1100901005 . (2-3 shots) 2. Upper null, �??normal�?? inner wall gap of 1.0-1.5 cm. Adjust from step 1 as necessary. Scan density from 0.9-1.3x1020 m-3. (2-3 shots) 3. Repeat 2 in upper null, reduce CLEARIN to achieve inner wall gap of 0.3-0.4 cm. Reference shot 1100901020. (2-3 shots) 4. Repeat 2 in double null by reducing ZCUR to achieve balance between upper and lower null. Reference shot 1101201002. (2-3 shots) 5. Inner wall limited. Reduce CLEARIN to achieve inner wall limited discharge. Reference shot 1100820003. (2-3 shots) PM (H): 1. Establish upper null H discharge at 5.4 T, 800 kA. Take a few shots to establish high H/low D plasma. (2-3 shots) 2. Upper null, nominal inner wall gap of 1.0-1.5 cm. Scan density from 0.9-1.3x1020 m-3. (2-3 shots) 3. Repeat 2 in upper null, reduce CLEARIN to achieve inner wall gap of 0.3-0.4 cm. (2-3 shots) 4. Repeat 2 in double null by reducing ZCUR to achieve balance between upper and lower null. (2-3 shots) 5. Inner wall limited. Reduce CLEARIN to achieve inner wall limited discharge. (2- 3 shots) |
| Physics Operators Plans |
| Entered: Feb 6 2011 10:24:15:687PM |
| Author: Robert Granetz |
Engineering setup for Monday 2011/02/07
MP641 - LHCD density limit in H and He discharges
Session leaders: G. Wallace
Physics operator: R. Granetz
** ECDC in helium over the weekend!
** Run will start at 10:00 and end at 18:00
Power systems as on: 1100901005 (0.8 MA, 5.4 T, 0.6e20 m-2 target, USN)
A-coil configuration: +Dtop -Dbot -Jtop +Jbot; Hybrid enabled (standard
configuration)
Gas Setup:
fill B-Top with 6 psi He 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 He Hybrid enabled (PG3)
leave NINJA as is
Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo, HIREX-Sr, B-spectrometer GV
Torvac setup: keep gate valves open during pulse
Specific diagnostics: GPI, reflectometers (SOL, O-mode LH, X-mode), DNB,
MSE, HXR array, LH probes, LH reflectometer, LH spectrum analyzer,
non-thermal ECE, fixed and scanning divertor probes
------------------------------------------------------------------------------
Boronization: no
Impurity injector: no
ICRF: no
LH: yes, see SL plan for specifics
DNB: yes
Cryopump: possibly in afternoon (with hydrogen plasmas)
------------------------------------------------------------------------------
Run plan: See the session leader's detailed run plan in the logbook. We
will run helium plasmas in the morning, including breakdown in
helium. In the afternoon we will switch to hydrogen plasmas,
including breakdown in hydrogen. We will be varying density and
plasma configuration (USN, DN, limited) during each half of the
day.
|
| Session Leader Summaries |
| Entered: Feb 9 2011 02:00:57:960PM |
| Author: Greg Wallace |
| Session leader summary for 1110207
MP641: LHCD density limit in He and H discharges SL: G. Wallace PO: R. Granetz Today's run was to investigate the physics of the LHCD density limit in He and H discharges. Data from D discharges shows a sharp drop in non-thermal electrons at nebar=0.8-1.0e20. Today's run shows that the density limit may be slightly higher in H, although at the highest densities (nebar ~ 1.5e20) the H and D discharges show the same HXR emission. He discharges show increased HXR emission at all densities scanned above the density limit (nebar ~ 1e20). Differences between the ion species are most pronounced for upper null discharges with large (> 1 cm) inner wall gaps. Discharges with small gaps (<0.5 cm) and no gap (i.e. inner wall limited) show smaller and almost no difference between ion species, respectively. The run was very successful with good data obtained in single null, single null w/ small inner gap, and limited configurations in both He and H. Unfortunately there was not enough time for the double null shots. Breakdown was achieved in He in the morning and H in the afternoon. According to Earl, H/(H+D) was measured to be ~2/3 during MARFEs in the H part of the discharge. No measurement of H fraction was available without when not MARFEing. Summary of shots (all at 5.4 T, 800 kA except where noted): 3-11: Upper null, large gap, He 12-15: Upper null, small gap, He 16-19: Limited, He 22-25: Upper null, large gap, H 26-27: Upper null, small gap, H 28-31: Limited, H 32: Upper null, large gap, H, 6.5 T List of good shots from 1110207: All shots at n|| = 1.9, Ip = 800 kA, and Bt = 5.4 T unless otherwise noted Helium shots: 3) 700 kW, nebar = 1.6-2.0e20, upper null, large gap, injection kills HXR after 1.2 s 4) 700 kW, nebar = 0.9-1.1e20, upper null, large gap, runaways start after injection at 1.0 s 5) 650 kW, nebar = 1.0-1.2e20, upper null, large gap 7) 600 kW, nebar = 1.0-1.55e20, upper null, large gap 8) 650 kW, nebar = 1.0-1.5e20, upper null, large gap 10) 600 kW, nebar = 1.2-1.55e20, upper null, large gap 11) 600 kW, nebar = 1.0-1.6e20, upper null, large gap 13) 600 kW, nebar = 1.0-1.6e20, upper null, smaller gap (0.7 cm) 14) 600 kW, nebar = 1.2-1.65e20, upper null, small gap (0.4-0.5 cm) 15) 650 kW, nebar = 0.95-1.45e20, upper null, small gap (0.4 cm) 16) 650 kW, nebar = 1.35-1.7e20, limited 19) 600 kW, nebar = 1.05-1.35e20, limited Hydrogen shots: 22) 650 kW, nebar = 0.75-1.1e20, upper null, large gap 25) 600 kW, nebar = 0.89-1.3e20, upper null, large gap 26) 700 kW, nebar = 1.0e20, upper null, small gap (0.4 cm) 27) 650 kW, nebar = 0.85-1.35e20, upper null, small gap (0.4 cm) 28) 680 kW, nebar = 1.2-1.4e20, limited, good before 1.0 s 29) 700 kW, nebar = 1.3-1.4e20, limited, good before 0.95 s 30) 700 kW, nebar = 1.3-1.4e20, limited, several sporadic trips 31) 650 kW, nebar = 1.4-1.7e20, limited, clean LH pulse 32) 600 kW, nebar = 0.9-1.3e20, upper null, large gap, Bt = 6.5 T |
| Physics Operator Summaries |
| Entered: Feb 7 2011 06:04:01:367PM |
| Author: Robert Granetz |
Run summary for Monday 2011/02/07
MP641 - LHCD density limit in H and He discharges
Session leader: G. Wallace
Physics operator: R. Granetz
Note: this run started at 10:00 and ended at 18:00.
The first 60% of today's LH run was done with helium plasmas, including
breakdown in helium. These were the first helium breakdown shots since
1090821. It only took a shot or two to obtain a reliable breakdown and
rampup. The latter 40% of today's LH run was done with hydrogen plasmas,
including breakdown in hydrogen. I don't know when we last did this.
Breakdown and rampup was obtained on the first try.
[For helium breakdown and fueling:
B-top had 6 psi He
B-main had 40 psi He
PG4 set to 24 ms in seg 1
PG3 programming in seg 1 was zero prior to t=0.
PG3 programming and nl_04 feedback gains in seg 2 had to be played with
to roughly obtain the desired waveform]
In both the helium and hydrogen plasmas we programmed a moderate density
ramp during the shot (which was only nominally controlled in helium), and
we ran a variety of magnetic configurations: upper single null with normal
inboard gap, upper single null with reduced inboard gap, and inner wall
limited. The LH worked well all day, and a lot of useful information on
the so-called density limit was obtained. The only real difficulties we
encountered were a number of early disruptions due to molybdenum
injections.
Scorecard: 29 plasmas
1 dud
1 fizzle
0 power supply tests
1 no-power MDS shot cycle
--------------
Total: 32 shot cycles
|
| Session Leader Comments | |||
| Feb 7 2011 10:20:19:067AM | 1110207001 | Greg Wallace | No power shot. |
| Feb 7 2011 10:20:10:253AM | 1110207002 | Greg Wallace | Looks like a dud. |
| Feb 7 2011 10:56:25:840AM | 1110207003 | Greg Wallace | Plasma! Breakdown in He. LH pulse is clean.
Density is too high on this shot (nebar=1.6-2e20). Miscommunication between PO and SL with respect to nebar vs nl_04. Next shot will decrease density to desired range (nebar=.9-1.3e20). |
| Feb 7 2011 11:06:34:123AM | 1110207004 | Greg Wallace | Plasma. Much lower density on this shot but no ramp. Injection at 1.0 s causes LH trip---might be caused by WASP?
Next shot will repeat with slightly less LH power (140 instead of 160 kW/klystron) and try to avoid disruption. Will also change control gains to get density ramp. |
| Feb 7 2011 11:20:42:967AM | 1110207005 | Greg Wallace | Clean LH pulse. Plasma disrupts just after LH turns off at 1.3 s. Density is still not ramping as desired. Density is steady around 1.05e20. 650 kW of LH yields steady loop voltage reduction from 1.1 to 0.8 V. Lots of non-thermal ECE.
Next shot will try again for density ramp. |
| Feb 7 2011 11:24:37:247AM | 1110207006 | Greg Wallace | Fizzle. |
| Feb 7 2011 11:56:09:440AM | 1110207007 | Greg Wallace | Clean LH pulse. Density starts low (nebar=1e20) then suddenly jumps up high (nebar=1.5e20) at 1.0 s.
Next shot will try again for better density control. |
| Feb 7 2011 12:01:29:660PM | 1110207008 | Greg Wallace | Clean LH pulse. Density controll is even worse now. Will try one last time for a density ramp with pre-programmed gas valve signals. |
| Feb 7 2011 01:05:17:190PM | 1110207009 | Greg Wallace | Disruption at 0.54 s. Data system issues. |
| Feb 7 2011 12:43:01:427PM | 1110207010 | Greg Wallace | Clean LH pulse at 600 kW. Density is 1.5e20 throughout LH pulse. Will try one final time for a density ramp before moving on to step 3 of the run plan. |
| Feb 7 2011 12:53:26:143PM | 1110207011 | Greg Wallace | Another shot with step-function in density. A few LH trips at the very beginning of the pulse. Density is ramping up quickly during the faulting but nothing visible on LH camera. Density on LH probes goes up by an order of magnitude as nebar changes from .7e20 to 1.4e20.
At this point we are going to move on to step 3 of the run plan---small inner wall gap upper null. |
| Feb 7 2011 01:03:00:707PM | 1110207012 | Greg Wallace | Disruption at .4 s. |
| Feb 7 2011 01:30:04:180PM | 1110207013 | Greg Wallace | A few faults early in LH pulse when density is very low. Inner gap is ~0.7 cm, want ~0.35 cm. Early nebar=.5e20, late nebar=1.5e20.
Next shot will increase feedback control on density and also reduce inner gap again. |
| Feb 7 2011 01:37:12:177PM | 1110207014 | Greg Wallace | Several trips again at beginning of LH pulse during the low density phase. Inner gap is 0.4-0.5 cm. Next shot will try to reduce inner gap by 0.1 cm. |
| Feb 7 2011 01:47:32:603PM | 1110207015 | Greg Wallace | Clean LH pulse with nice density ramp from .8-1.4e20. Injection at 0.75 s but still have good data during LH pulse.
Next shot will go on to inner wall limited discharges in He (step 5 of run plan). Skipping double nulls for now. |
| Feb 7 2011 02:05:00:003PM | 1110207016 | Greg Wallace | Many trips early in LH then one trip later in pulse. Inner gap < 0.05 cm according to EFIT. Will try again for cleaner LH. Density at LH antenna is quite low before 1.0 s. Next shot will decrease outer gap by 5mm. |
| Feb 7 2011 02:13:54:427PM | 1110207017 | Greg Wallace | Disruption at 0.6 s. |
| Feb 7 2011 02:29:22:640PM | 1110207018 | Greg Wallace | Disruption at 0.6 s. |
| Feb 7 2011 02:42:33:643PM | 1110207019 | Greg Wallace | Several trips late in LH pulse. Disruption at 1.4 s. Inner wall limited. Got some good data and now moving on to H part of the day.
Next shot will repeat 11 but in H instead of He. |
| Feb 7 2011 03:08:46:473PM | 1110207020 | Greg Wallace | Disruption at 0.35 s. PF breaker pulled. First attempt at H plasma. Will try again for next shot. |
| Feb 7 2011 03:23:03:260PM | 1110207021 | Greg Wallace | Disruption at .17 s. Runaway shutdown. |
| Feb 8 2011 10:33:10:523AM | 1110207022 | Greg Wallace | One early trip in LH pulse, otherwise good shot. Density ramp from nebar = 0.8-1.1e20 in H. Looks like maybe more non-thermals than in D or He??? Need to quantify that, of course. Upper null, large inner gap.
Next shot will try for a little higher density. |
| Feb 7 2011 03:46:57:670PM | 1110207023 | Greg Wallace | Disruption at .25 s. |
| Feb 7 2011 04:19:41:893PM | 1110207024 | Greg Wallace | LH did not fire on this shot. Data seems to be missing too. Will try again. |
| Feb 7 2011 04:25:30:133PM | 1110207025 | Greg Wallace | Clean LH pulse at 600 kW in H. Good density scan from nebar=.9-1.3e20. Good scanning probe data.
Still have clear non-thermal emission at 1.3e20, higher than what we're used to in D. Next shot will go back to equilibrium from shot 15 (small inner gap) but keep the density programming from shot 25. |
| Feb 8 2011 10:35:00:967AM | 1110207026 | Greg Wallace | LH ran clean until disruption. Small inner wall gap. Looks like probe scan might be responsible. Good non-thermal ECE before disruption. Next shot will repeat. |
| Feb 7 2011 04:53:11:650PM | 1110207027 | Greg Wallace | Clean LH pulse in H with small inner gap. Good shot for step 3 in H. Moving on to inner wall limited. Will reload RCUR and CLEARIN from shot 19. |
| Feb 7 2011 05:06:53:357PM | 1110207028 | Greg Wallace | B row cols 10?-16 seem to be causing problems. Too much density at grill? Will increase outer gap by ~4 mm for next shot. |
| Feb 7 2011 05:28:40:547PM | 1110207029 | Greg Wallace | Many trips in the LH pulse. Still having problems on B row columns 10-16. Density on LH probes is ~2e18. Will try increasing outer gap by another 4 mm (to ~2.3 cm) for next shot. |
| Feb 7 2011 05:44:49:420PM | 1110207030 | Greg Wallace | Better LH on this shot. Still some glowing on B row col 14-16 septa. Will increase the outer gap by an additional 3 mm to see if that helps. Will also add a bit of a density scan (above current level). |
| Feb 7 2011 05:56:42:627PM | 1110207031 | Greg Wallace | Clean LH and got density scan up to nebar=1.7e19. Good final shot for inner wall limited in H.
Next shot will reload shot 25 (USN, large gap) and increase to 6.5 T to investigate peak in non-thermal ECE on FRC. Ron wants to see if feature moves; he suspects it's instrumental and will not move. |
| Feb 7 2011 06:10:01:127PM | 1110207032 | Greg Wallace | Last shot of the day. Repeat of shot 25 at higher field for Ron. 6.5 T. Inner gap of 1.4 cm. |
| Physics Operator Comments | |||
| Feb 7 2011 09:41:09:220AM | Robert Granetz | Note: the last successful helium breakdown run was 1090821. I chose seg 1 from shot 7 that day to copy the pre-fill and PG3 programming. The B-top and B-main plenum pressures were 6 psi and 40 psi of helium that day, and I've done the same setup for today. Loaded seg 1 with seg 1 from 1110204031 (last Friday, 5.4 T), and adjusted pre-fill (PG4) and PG3 as described above. Loaded seg 2 with seg 2 from 1100901005 as per SL's plan, and programmed nl_04 to ramp from 0.9e20 to 1.3e20 m-2. | |
| Feb 7 2011 10:23:20:697AM | 1110207001 | Robert Granetz | Shot 01 -- No-power shot cycle because we got hung up in INIT Next shot: try for plasma |
| Feb 7 2011 10:24:48:103AM | 1110207002 | Robert Granetz |
Shot 02 -- Dud. Pre-fill pressure reading was about the same as the last time we broke down in
helium (see 1090821007). Bz0 looks a bit high.
Next shot: add -20 A to IC_EF4 (to -1310 A); add 1 ms to pre-fill
|
| Feb 7 2011 10:37:33:063AM | 1110207002 | Robert Granetz | Btor did not get all the way to 5.4 T by t=0. This could also explain some of the Bz0 offset. Therefore, I have changed the tweaks so that the total change to IC_EF4 is only -10 A (i.e. not -20 A), and the pre-fill is now 4 ms longer than on shot 02. |
| Feb 7 2011 10:54:42:263AM | 1110207003 | Robert Granetz |
Shot 03 -- Plasma, nearly full length. Helium plasma with helium breakdown. 0.8 MA, 5.4 T,
0.8-1.2e20 m-2, USN. P_LH=0.7 MW, very clean. Inner gap = 1.4 cm
Next shot: decrease nl_04 and change times of density ramp programming
|
| Feb 7 2011 11:04:29:100AM | 1110207004 | Robert Granetz |
Shot 04 -- Plasma, full length. Helium, 0.8 MA, 5.4 T, 0.6e20 m-2, USN. Inner gap = 1.2-1.3 cm.
Density did not behave as programmed.
Next shot: increase proportional gain on nl_04 to 5.0 (from 2.5)
|
| Feb 7 2011 11:17:43:397AM | 1110207005 | Robert Granetz |
Shot 05 -- Plasma, disrupted at t=1.31 due to a big injection. Helium, 0.8 MA, 5.4 T, 0.6e20 m-2,
USN. Inner gap = 1.3-1.4 cm. Density is still not behaving.
Next shot: put some PG3 programming on in seg 2; also increase nl_04 gain to 9.
|
| Feb 7 2011 11:33:55:183AM | 1110207006 | Robert Granetz |
Shot 06 -- Fizzle, but it made it to 90 kA. Breakdown looks okay; I think something came in
at t=0.022 s and killed the plasma.
Next shot: reduce PG3 programming in seg 1 to be only 20 ms long (instead of 30 ms).
|
| Feb 7 2011 11:50:47:113AM | 1110207007 | Robert Granetz |
Shot 07 -- Plasma, full length. Helium. 0.8 MA, 5.4 T, 0.6-0.85 m-2, USN. Inner gap = 1.2-1.4 cm.
P_LH=0.6 MW
Next shot: tweak PG3 voltage programming
|
| Feb 7 2011 12:01:25:827PM | 1110207008 | Robert Granetz |
Shot 08 -- Plasma, full length. Helium. Density is still no behaving. We may have to go to
mostly pre-programmed voltage, rather than nl_04 feedback.
Next shot: extend PG3 voltage programming; turn down PD gain on nl_04; also increase argon puff
to 100 ms (from 70 ms)
|
| Feb 7 2011 12:28:07:763PM | 1110207009 | Robert Granetz |
Shot 09 -- Plasma, disrupted at t=0.54 s. Data acquisition is having some problems. Looks like
OH2L crowbarred and caused this disruption
Next shot: try again; no changes
|
| Feb 7 2011 12:42:38:107PM | 1110207010 | Robert Granetz |
Shot 10 -- Plasma, full length. Helium. 0.8 MA, 5.4 T, 0.35-0.86e20 m-2, USN. Inner gap = 1.2-1.4 cm.
P_LH=0.6 MW and very clean.
Next shot: more tweaking of PG3 voltage programming
|
| Feb 7 2011 12:54:24:127PM | 1110207011 | Robert Granetz |
Shot 11 -- Plasma, full length. Helium. 0.8 MA, 5.4 T, 0.33-0.87e20 m-2, USN. Inner gap = 13-14 mm
P_LH=0.6 MW.
Next shot: decrease inner gap by 10 mm while keeping outer gap unchanged (delta RCUR = -5 mm)
|
| Feb 7 2011 01:06:32:417PM | 1110207012 | Robert Granetz | Shot 12 -- Plasma, disrupted at t=0.40 s. No obvious reason. Next shot: repeat, no changes |
| Feb 7 2011 01:22:02:950PM | 1110207013 | Robert Granetz |
Shot 13 -- Plasma, full length. Helium. 0.8 MA, 5.4 T, 0.3-0.85e20 m-2, USN. Inner gap = 7 mm.
P_LH=0.6 MW.
Next shot: decrease CLEARIN another 3.5 mm; decrease RCUR by 1.75 mm to keep outer gap unchanged;
increase nl_04 PD gains by factor of 2 (to 4)
|
| Feb 7 2011 01:35:53:283PM | 1110207014 | Robert Granetz |
Shot 14 -- Plasma, full length. Helium. 0.8 MA, 5.4 T, 0.4-0.9e20 m-2, USN. Inner gap = 4-5 mm.
P_LH=0.6 MW.
Next shot: reduce CLEARIN another 1 mm
|
| Feb 7 2011 01:46:34:413PM | 1110207015 | Robert Granetz |
Shot 15 -- Plasma, full length. Helium. 0.8 MA, 5.4 T, 0.4-0.9e20 m-2, USN. Inner gap = 4-5 mm.
Good density ramp. P_LH=0.6+ MW.
Next shot: limited plasma --> set CLEARIN to -2 cm
|
| Feb 7 2011 02:06:06:180PM | 1110207016 | Robert Granetz |
Shot 16 -- Plasma, full length. Helium. Inner wall limited. 0.8 MA, 5.4 T, 0.55-0.9e20 m-2.
Next shot: reduce CLEARIN by 1 mm. Repeat mostly for LH tuning. Also decrease outer gap
by 5 mm (increase RCUR by 2.5 mm)
|
| Feb 7 2011 02:21:34:270PM | 1110207017 | Robert Granetz |
Shot 17 -- Plasma, disrupted at t=0.60 s due to injection. Helium. 0.8 MA, 5.4 T, 0.6e20 m-2.
Inner wall limited.
Next shot: repeat, no changes
|
| Feb 7 2011 02:30:03:007PM | 1110207018 | Robert Granetz | Shot 18 -- Plasma, disrupted at t=0.60 s. Helium. 0.8 MA, 5.4 T, 0.6e20 m-2, inner wall limited. Next shot: try again |
| Feb 7 2011 02:43:26:550PM | 1110207019 | Robert Granetz |
Shot 19 -- Plasma, disrupted at t=1.39 s. Helium. 0.8 MA, 5.4 T, 0.6-0.8e20 m-2, inner wall
limited. P_LH=0.6 MW
Next shot: switch over to hydrogen plasmas, with hydrogen breakdown; reload shot 11 (USN w/standard gap)
|
| Feb 7 2011 02:53:02:540PM | 1110207019 | Robert Granetz | We're turning on the cryopump for these hydrogen plasmas, so I'm increasing the pre-fill pulse to 55 ms. |
| Feb 7 2011 03:09:42:060PM | 1110207020 | Robert Granetz | Shot 20 -- Plasma, disrupted at t=0.35 s. Hydrogen breakdown was successful. Breaker pulled. Next shot: turn off PG3 programming and rely on nl_04 feedback in H2 w/cryopump |
| Feb 7 2011 03:25:57:717PM | 1110207021 | Robert Granetz | Shot 21 -- Plasma, but shut down early due to hard x-rays. Next shot: copy standard PG3 programming into segs 1 and 2. |
| Feb 7 2011 03:40:35:543PM | 1110207022 | Robert Granetz |
Shot 22 -- Plasma, full length. Hydrogen w/hydrogen breakdown. 0.8 MA, 5.4 T, 0.4-0.6e20 m-2, USN.
Better density control than helium.
Next shot: increase nl_04
|
| Feb 7 2011 03:58:41:447PM | 1110207023 | Robert Granetz |
Shot 23 -- Plasma, short runaway shot, terminated at t=0.25 s. A lobe of synchrotron
emission showed up on the WIDE2 video camera image.
Next shot: increase pre-fill to 60 ms
|
| Feb 7 2011 04:01:19:763PM | 1110207024 | Robert Granetz | Shot 24 -- Plasma, full length. Hydrogen. 0.8 MA, 5.4 T, 0.4-0.7e20 m-2, USN. No LH. Next shot: repeat for LH |
| Feb 7 2011 04:28:38:317PM | 1110207025 | Robert Granetz | Shot 25 -- Plasma, full length. Hydrogen. 0.8 MA, 5.4 T, 0.5-0.7e20 m-2, USN. P_LH=0.6 MW. Next shot: decrease inner gap by loading CLEARIN and RCUR from shot 15 today. |
| Feb 7 2011 04:36:52:190PM | 1110207026 | Robert Granetz |
Shot 26 -- Plasma, disrupted at t=1.06 s, probably due to the FSP plunge. Hydrogen. 0.8 MA, 5.4 T,
0.6e20 m-2, USN with left gap = 3-4 mm.
Next shot: repeat, no changes
|
| Feb 7 2011 04:53:38:740PM | 1110207027 | Robert Granetz |
Shot 27 -- Plasma, full length. Hydrogen. 0.8 MA, 5.4 T, 0.5-0.7e20 m-2, USN with inner gap = 3-4 mm.
P_LH=0.6-0.7 MW.
Next shot: switch to inner wall limited by loading CLEARIN and RCUR from shot 19 today
|
| Feb 7 2011 05:07:20:623PM | 1110207028 | Robert Granetz |
Shot 28 -- Plasma, full length. Hydrogen. 0.8 MA, 5.4 T, 0.7-0.8e20 m-2, inner wall limited.
P_LH=0.6 MW.
Next shot: increase outboard gap by 4 mm (decrease RCUR by 2 mm)
|
| Feb 7 2011 05:29:49:550PM | 1110207029 | Robert Granetz |
Shot 29 -- Plasma, full length. Hydrogen. 0.8 MA, 5.4 T, 0.7-0.8e20 m-2, inner wall limited.
P_LH=0.7 MW, but still with faulting. Outer gap increased by 4 mm (now at 2 cm).
Next shot: increase outer gap another 4 mm (move RCUR in another 2 mm)
|
| Feb 7 2011 05:44:44:667PM | 1110207030 | Robert Granetz |
Shot 30 -- Plasma, full length. Hydrogen. 0.8 MA, 5.4 T, 0.7e20 m-2, inner wall limited. Outer gap
increased about 3 mm. P_LH=0.7 MW, but still with some faulting.
Next shot: increase outer gap by another 3 mm (decrease RCUR by 1.5 mm); set density ramp
to higher values
|
| Feb 7 2011 06:02:44:690PM | 1110207031 | Robert Granetz |
Shot 31 -- Plasma, full length. Hydrogen. 0.8 MA, 5.4 T, 0.8-0.9e20 m-2, inner wall limited.
P_LH=0.67 MW.
Next shot: reload seg 2 from shot 25 (USN, normal inboard gap), but increase Btor to 6.5 T (181 kA).
|
| Feb 7 2011 06:09:33:747PM | 1110207032 | Robert Granetz |
Shot 32 -- Plasma, full length. Hydrogen. 0.8 MA, 6.5 T, 0.5-0.7e20 m-2, USN w/normal gap.
P_LH=0.62 MW.
End of run
|
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 10:03:09:473AM | Plasma | Bad | Shot cycle |
| 2 | 10:16:08:853AM | Plasma | Ok | |
| 3 | 10:43:39:050AM | Plasma | Ok | |
| 4 | 10:56:34:910AM | Plasma | Ok | |
| 5 | 11:09:53:960AM | Plasma | Ok | |
| 6 | 11:22:19:623AM | Plasma | Ok | |
| 7 | 11:40:41:143AM | Plasma | Ok | |
| 8 | 11:53:22:993AM | Plasma | Ok | |
| 9 | 12:06:39:360PM | Plasma | Bad | EF1 & OH2 Comm Flt |
| 10 | 12:32:41:233PM | Plasma | Ok | |
| 11 | 12:45:11:540PM | Plasma | Ok | |
| 12 | 12:59:28:850PM | Plasma | Ok | |
| 13 | 01:12:13:083PM | Plasma | Ok | |
| 14 | 01:25:55:900PM | Plasma | Ok | |
| 15 | 01:40:26:913PM | Plasma | Ok | |
| 16 | 01:56:35:260PM | Plasma | Ok | |
| 17 | 02:11:51:290PM | Plasma | Ok | |
| 18 | 02:24:45:267PM | Plasma | Ok | |
| 19 | 02:36:59:500PM | Plasma | Ok | |
| 20 | 03:05:49:193PM | Plasma | Bad | OH1 self powered |
| 21 | 03:18:49:190PM | Plasma | Ok | |
| 22 | 03:31:22:940PM | Plasma | Ok | |
| 23 | 03:44:33:480PM | Plasma | Ok | |
| 24 | 03:57:08:203PM | Plasma | Ok | |
| 25 | 04:15:21:547PM | Plasma | Ok | |
| 26 | 04:30:04:977PM | Plasma | Ok | |
| 27 | 04:44:21:027PM | Plasma | Ok | |
| 28 | 05:01:07:847PM | Plasma | Ok | |
| 29 | 05:19:40:773PM | Plasma | Ok | |
| 30 | 05:34:24:140PM | Plasma | Ok | |
| 31 | 05:48:40:780PM | Plasma | Ok | |
| 32 | 06:05:26:697PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Feb 7 2011 10:02:53:853AM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||