| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Amanda Hubbard |
| Physics operator(s): | Ron Parker |
| Engineering operator(s): | Roza Tesfaye,Bill Parkin,Bill Byford |
| Engineering Operator Run Comment |
| MP 642: Assessing feasibility of producing 'hybrid' scenario on C-Mod wi |
| Session Leader Plans |
| Entered: Feb 2 2011 11:16:17:660AM |
| Author: Amanda Hubbard |
| Run Plan for Thurs, Feb 3rd
MP 642: Assessing feasibility of producing 'hybrid' scenario on C-Mod with LHCD Session Leader: Amanda Hubbard Physics Operator: Ron Parker Key systems and diagnostics: ICRF (all available, start with J+E), LHCD, Cryopump (from first shot), DNB, MSE, Polarimetry, Edge TS, fast MHD, hard x-ray camera. Request overnight ECDC in HELIUM to outgas the walls. This run is the first of a two-day MP aimed at modifying the current profile with LHCD (ideally broadening, with q0 around 1), then making H-modes with ICRF. Key questions are: - Can the j(r) modification be maintained during ICRF and H-mode? - Are the H-modes changed, either continuously or transiently, as a result of j(r) differences? We will start at low current, 450 kA, to give the lowest H-mode density and greatest relative current drive. Good starting shot is 1110106030 (5.4 T) . But, we will want to move to USN early in the flat top, and slow down the current ramp, to reach flat top by more like 350 ms (as on 1080414, Sips hybrid expt), and ideally avoid the overshoot. 1) First few shots will use ICRF only, varying density to find the minimum which gives steady H-modes. LHCD may wish to tune/condition later in the discharge. Keep an eye on k-limiter heating, and keep ICRF pulses short to start. (If it is a big problem we may need to move to 600 kA earlier). 2) We will then start applying LHCD, varying timing and N// to delay/reduce sawteeth until well into flat top (and ideally maintaining density similar to the optimum in step 1). Will look at discharges on 1080414, which successfully modfied j(r), as a guide; starting about 200 ms seemed to work well. Will make sure to have an ohmic period late in flat top to calibrate MSE vs EFIT. Anticipate a number of discharges with varying parameters. May want to use lower N// during the rampup, then increase at or before the ICRH turnon. 3-5 discharges. 3. Add ICRH (~ 2.5 MW) to LH-modified targets. Vary timing: Before, near, and after the time of sawtooth appearance. Monitor H-mode evolution, and non-thermal signatures, sawteeth and other MHD, and to the extent possible current profiles. When do sawteeth reappear? Do non-thermals persist? Are pedestals and confinement different than in Step 1? 6+ discharges. 4. To try to separate LH pumpout from current profile effects, take best discharge from step 3, and reduce LH N// to lower value below accessibility limit in H-mode, starting just before the ICRH. Does the pedestal and confinement evolution change? Non-thermals? 2 discharges. By mid-run, we will raise Ip to 600 kA, and repeat the sequence (hopefully requiring fewer discharges once we have learned the best recipes). Good starting shot is1110106025. Again, start by setting up LHCD-modified target, then add ICRH to make H-mode, and compare to ohmic target. May repeat one or both currents with higher Bt (around 6 T) to move ICRF heating off axis and see what effect that has on H-mode current profiles. And/or "optimize" any promising scenarios by increasing ICRF power to raise beta and temperature. |
| Physics Operators Plans |
| Entered: Feb 3 2011 09:39:23:900AM |
| Author: Ron Parker |
| PO Plan for 1110203
MP 642: Assessing feasibility of producing 'hybrid' scenario on C-Mod with LHCD Session Leader: Amanda Hubbard Physics Operator: Ron Parker Run begins at 09:00 and ends at 17:00 ---------------------------- Engineering Setup for 1110203 ---------------------------- Power systems as on 1080414020. Verify that the OH crowbars are at 0.040 sec and the EF1 crowbars are at .090 sec Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid Enabled 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 Enable gate-valves and shutters: ECE, VUV, HiREX Sr, Xeus Leave z-bolo shutter as is (should be open) Torvac gatevalve toggle (yes/no): no Boronization(yes/no): no Overnight ECDC (yes/no): yes, in helium ICRF(yes/no): yes LH(yes/no): yes Cryopump (yes/no): yes DNB (yes/no): yes Vessel temperature: 35/35/35 ------------------------------ ECDC parameters: ------------------------------ 3 hrs in He sweep: 44/45/103cm scan: 20/120 s |
| Session Leader Summaries |
| Entered: Feb 4 2011 02:24:01:057PM |
| Author: Amanda Hubbard |
| Run Summary for Thurs, Feb 3rd 2011
MP 642: Assessing feasibility of producing 'hybrid' scenario on C-Mod with LHCD Session Leader: Amanda Hubbard Physics Operator: Ron Parker This was the first run of what will clearly need to be a more than two run day MP. It was slow going, but we essentially followed the 450 kA part of the run plan, and made good progress though did not get a definite result. As noted in the Physop summary, establishing a startup slow current rise proved challenging, since it had not been used since roughly the last hybrid run by Sips on 1100414. By noon we had only about 4 discharges into flat top, and they had equilibrium issues. These improved when we decided to stay in LSN for the flat top. However, the perseverence proved worthwhile I believe; we did get nice smooth, well controlled Ip and ne rises, and by later in the run most plasmas were successful. Shots 12 and, even better, 13 were good ICRF only reference discharges, which had nice steady H-modes with low density - down to nebar 1.5 e20 m-3. 13 had 2.5 MW ICRF, 48 kJ. While we didn't take many shots to optimize, this essentially completed Step 1. ICRF heated well without limiter heating. Shots 15, 17, 19 and 20 were devoted to Step 2: LHCD only to modify current in startup. This was quite readily acomplished; adding LH 0.25-0.75 s quickly suppressed sawteeth, which returned only in flat top. We tweaked gaps, density in the Ip rise and LH power. Shot 19 was perhaps the best case; 20 had increased radiation and perhaps a locked mode (never had sawteeth). A notable point today is that sawteeth typically appeared at only 300 kA (~ 220 ms). Combining the LHCD and ICRF to make an LH-modified H-mode, and prospective hybrid scenario, began on shot 21. However, at about this point in the run we began to be plagued with data acquisition issues on several key diagnostics; DNB, HXR camera, D-alpha among others. This caused numerous delays, and we likely have some missing data. Shot 21 had a prompt H-mode with ICRF, but rather high impurities. Shot 23 had a much delayed H-mode, likely after the LH effects have diminished. Shot 25, with 3 MW ICRF, had a transiently high performance H-mode (60 kJ, H98~1). In other discharges (eg shot 26) we did not get an H-mode in the ICRF period. Not clear whether this is due to slightly lower density, LHCD effects or something else. In these cases, with nebar ~ 10^20, we did get high k limiter readings and impurity injections. These shots should be useful for tracking non-thermals vs density and ICRF power, in the range of the density limit. All day, the non-linear decrease of non-thermals with density was very apparent. Sawteeth always returned fairly soon after ICRF was turned on, though not immediately; we await analysis of MSE and polatimeter data to see j(r) changes with and without LHCD and ICRF. In summary, we have good progress MP (and C-Mod milestone) but not yet a clear result. These conditions will be good starting points for another run day which I strongly hope will be scheduled this campaign, and expect to proceed much more quickly now discharges have been developed. We did, however, serendipitously get enough data to complete an unscheduled MP by David Pace! Shot 1, which had accidental LHCD near t-0, and shot 22, which had LHCD on after a plasma shutdown due to (non-LH induced) runaways, apparently gave much interesting MHD activity (see his logbook entries for details). Shot 22 was also notable in obtaining Vloop < 0.1 V for over 100 me, albeit at low and decreasing Ip. |
| Physics Operator Summaries |
| Entered: Feb 3 2011 06:20:31:407PM |
| Author: Ron Parker |
| This was a diffiiicult run, primarly because the run plan called for a slow startup, reaching 450 kA after aboout 400 ms. This required adapting a shot from 2008, namely 1080412030. This first of all required updating the predictors on several of the magnetic-coil-derived control signals. Fortunately, Steve Wolfe came to the rescue with a detailed set of instructions for adapting the 2008 shot to the shot needed for this run. Thise instructions are repeated here along with comments regarding their implementation.
1) Request (from engineering) power system setup as on 1080414020. NB: Should have been shot 30). Verify that the OH crowbars are at 0.040 sec and the EF1 crowbars are at .090sec 2) LOAD FROM shot 1110106020, which has more or less your main program waveforms. This will also preserve the present set of procedures, including the runaway shutdown and the software for the gas valves. 3) Import Segment 1 (not load from, use IMPORT SEGMENT) from 1080414020. It will complain about needing to update predictors. Recalculate predictors for RCUR (change OFFSET from 1000 to 3500 after hitting CALL) ZCUR (both wires) zxl bz_0 BR_0 Do a BUILD_ALL to verify all the changes got made. Watch for a pop-up that tell you which wires, if any, are still invalid, note the numbers, acknowledge the popup, and do any wires that were got missed. Here a problem developed when the build all failed to report that 3 of the predictors had not been updated.This was apparently a problem with the PO's computer and Josh and Steve managed to find a solution. 4) On the V01-16 screen in segment 1 change gas waveforms for startup: A) change pg4 pulse from 25msec to 50 or 55msec. B) change pg3 waveform to start at -.019sec at 100V, drop to 40V at +.010, then flat at 40V to .1sec This step was done, but in developing the shot it was found that a somewhat different tuning of the PG 3 waveform was required for a smooth startup. See shot 26. 5) In segment 2, change the Ip waveform to start flattop at 0.35sec, and change the Proportional Gain to go to 8 at .1sec The value of Ip at the beginning of segment 2 which allowed a smooth connection to the value of Ip at the endof segment 1 was found empirically. 6) In segment 2, bring up the V#01-16 screen and make the following changes to reduce or remove feedforward voltages: A) Change the OH1_VOLT trace to be 0V from 0.05 to 0.1sec, then up to 50V at .15 sec and flat at 50V to 1.7sec, then down to 0V B) Set the OH2_U_VOLT trace to be flat at 0V from .1sec to 1.7sec, then down to 0V C) Paste the OH2_U_Volt trace into the OH2_L_VOLT trace D) Set the EF1_U_VOLT trace to be flat at 0V from .1sec to 1.7 sec, then down to 0V E) Paste the EF1_U_VOLT trace into the EF1_L_VOLT trace F) Set the EF2_U_VOLT trace to be flat at 0V from .1sec to 1.7sec, then down to 0V. G) Paste the EF2_U_VOLT trace into the EF2_L_VOLT trace 7) Adjust the divert time to be earlier in the rampup. In Segment 2, move the CLEARIN point at 0.2sec and 0.0 to 0.12sec. All of these steps were straightforward to implement. (Recall that for pasting, hit the paste button, then use the left mouse button to copy and the middle button to paste.) I would load this and try to get the startup and rampup working correctly before making changes to the timing of the swing to UPPER NULL. When you do get around to that, remember that in addition to changing the time of the ZCUR sweeps in seg 2, you will need to bring up the CLEARIN screen and change the time for the second predictor (on row 3). After implementing these instructions, many shots were required to develop a smooth startup. Two tweaks seemed to be the most beneficial: the programming of the PG 3 gas in segment 1 during commutation and increasing the EF 3 voltage as described in the shot 10 entry. At any rate, by shot 23 a decent slow startup meeting the run requirements was obtained. Since a goal of the runplan was to create an ICRF H-mode after stabilizing sawteeth with LHCD, relatively high RF power was required (~ 3 MW). At the low current (450 kA) and low densities (nl_04 ~ 4e19) considerable heating of the K limiter occurred, presumably contributing to the relatively high disruptivity in this run. In summary, roughly half the run was devoted to discharge development, with many fizzles and disruptions. From about shot 17 on, the startup became more reliable and several shots in line with the run plan were obtained. For future reference, shot 26 is perhaps the best example of a shot with slow startup. Unfortunately, one fairly long delay (~ 1 hour) was encountered due to a problem with the HXR digitizer and the run was effectively terminated 30 minutes early due to a concern about a vibration issue in the alternator. |
| Session Leader Comments | |||
| Feb 3 2011 09:47:22:893AM | 1110203001 | Amanda Hubbard |
First plasma ran - not a given after many programming changes. But short and very-non thermal. Density very low, perhaps due to the Helium ECDC. LH fired at t=0 which likely explains the non-thermals! Current rise was indeed slow as desired, got to 320 kA by 270 ms. |
| Feb 3 2011 10:15:42:683AM | 1110203002 | Amanda Hubbard | Made it to 1.1 s this time. Slow current rise as desired, reaches 450 kA by 460 ms. ICRF on 0.5-0.8, and LHCD on 0.9-1.1 s; both mainly for conditioning purposes. Both tripping, we got a short H-mode at 0.65 s. D-alpha seems rather high at times in ramp.
Small sawteeth coming in already at 0.137 s, earlier than I'd have expected (only 210 kA) Next shot request ICRF turnon later, try for a decent H-mode. Also noticed what looks like pickup from ICRF on Bt signal (maybe other magnetics??). Engineers checking for open doors, didn't find any. |
| Feb 3 2011 10:21:03:827AM | 1110203003 | Amanda Hubbard | Fizzle - looks like it almost went.
|
| Feb 3 2011 10:39:22:033AM | 1110203004 | Amanda Hubbard | Better. Fairly smooth current rise, 450 kA by 0.4 s. Disrupts about 1.3 s,
ICRF on 0.6-0.8; E is tripping and we did not get an H-mode. Given we should be USN by this time, will likely need more power; requesting 3 MW as in our lovely target shot 1110106030. LH stays on at 350 kW, 0.9-1.3 s, no evident effect. |
| Feb 3 2011 11:16:29:273AM | 1110203006 | Amanda Hubbard | Current rise looks reasonable - Ip and ne rise quite smoothly, though there's a MARFE ~ 0.2 s. Sawteeth start 0.17 s, 300 kA.
Something really bad happened in the part of the shot with ICRF; huge radiation and D-alpha, taking a bite out of Ip and ending in disruption. Went inner wall limited by 0.7, not sure if that was a cause or effect. Punt on the USN swing for now, and reduce ICRF power to 2 MW. We need to get to a steady reference H-mode! |
| Feb 3 2011 11:13:24:163AM | 1110203007 | Amanda Hubbard | Fizzle |
| Feb 3 2011 11:23:43:863AM | 1110203008 | Amanda Hubbard | Fizzle |
| Feb 7 2011 09:19:48:620AM | 1110203009 | Amanda Hubbard | Fizzle |
| Feb 3 2011 12:06:10:800PM | 1110203010 | Amanda Hubbard |
Plasma until 1 sec, disruption. Probably caused by LH-induced radiation? Nice current rise this time. Got up to 2 MW ICRF, but it is tripping. I think we had a short H-mode, but without Dalpha it is hard to be sure. nebar 1.3 L-mode, 1.7 to 1.6 e20 H-mode, about what we want. Still dropping. Next shot (when we get one) will turn off LHCD, extend ICRF to 0.9. |
| Feb 3 2011 12:07:43:997PM | 1110203011 | Amanda Hubbard | post-disruption fizzle, as per expectations. |
| Feb 3 2011 12:29:23:887PM | 1110203012 | Amanda Hubbard | First really useful reference shot. ICRF stays on at 2 MW, definite steady H-mode, and density is dropping steadily through it. nebar 1.15 at ICRF o1.8 to 1.55 in the H-mode. Still got a disruption in rampdown, let's hope the startup can cope with it.
Next shot: Move ICRF earlier (0.5-0.9 s) to give more time for density to stabilize. Raise power a little. ALso, realized target density was higher than I wanted (nel 7.5e19 m-2). Reduce to 6e19, see if I still get steady H-mode. Reducing outer gap. This may be too many changes at once, but time is passing... |
| Feb 3 2011 12:41:00:673PM | 1110203013 | Amanda Hubbard | Two in a row! Earlier ICRF and lower target density gave a nice steady H-mode, nebar 1.6-1.5e20 m-3.
While I could take more shots to reduce still further, given the time I will consider this our "Step 1" reference. Next move to Step 2: Turn off ICRF (for now) and turn on LHCD in the current rise - 0.25 to 0.75 s. This will likely be more challenging for the coupling. |
| Feb 3 2011 12:49:15:947PM | 1110203014 | Amanda Hubbard | PS dud. Try again. And after a little calculation of accessibility, reduce LHCD N// to about 2.3; should be accessible even in the H-mode with ne this low. And this shot shouldn't have any H-mode. |
| Feb 3 2011 01:09:27:820PM | 1110203015 | Amanda Hubbard | First shot with LHCD in Ip rise (0.25 s, 450 kW, N// 2.3). It did suppress the sawteeth quite promptly, but then Te0 dives. A period 0.35-0.45 s with strong non-thermals, then they disappear and plasma MARFEs. Leading to Ip dip, and disruption at 0.55 s.
Greg requests changes to gap in rise. |
| Feb 3 2011 01:14:08:543PM | 1110203016 | Amanda Hubbard | Fizzle |
| Feb 3 2011 01:40:21:370PM | 1110203017 | Amanda Hubbard | Good shot. LHCD on clean from 0.25-0.75 s, 400 kW.
Sawteeth disappear 0.32 - 0.55 s. Significant non-thermal ECE, but transient; usual inverse dependence on nebar I think. Try again with more LH power. Also tweaked the density in rise to try to increase LHCD. |
| Feb 3 2011 01:44:38:123PM | 1110203018 | Amanda Hubbard | Fizzle. |
| Feb 3 2011 02:08:28:560PM | 1110203019 | Amanda Hubbard | Good shot. 500 to 450 kW in Ip rise, sawteeth suppressed0.32-0.55 secs, and large drop in Vloop. (1.3-0.55 V). LH definitely doing something to j!
Large LH reflection, which Greg attributes to gaps. Tweak this, and the density at 0.3 s. If this goes well I plan to turn ICRF on the following shot. |
| Feb 3 2011 02:58:06:523PM | 1110203020 | Amanda Hubbard | LHCD only, in Ip rise. Couples better, but Prad is high and sawteeth never appear; we suspect a locked mode. Too low in density? Go back to shot 19 density, and add ICRF next pulse. |
| Feb 3 2011 02:46:11:057PM | 1110203021 | Amanda Hubbard | Pretty good shot. Did suppress sawteeth from about 0.3 s. But, this time Te0 also drops steeply, and there are some LH trips (600kW, some lighting up).
When ICRF is added at 0.5, non-thermals drop. Sawteeth return at 0.52 s, L-H transition I think at 0.53 s. We've unfortunately been lacking several diagnostics due to CAMAC problems. I note several injections in H-mode. Asked LH to dial back to 500 kW. WMHD was 39 kW, not I think better than in the reference shot 13. Lower, actually. nebar about 1.5 e 20. |
| Feb 3 2011 03:14:21:147PM | 1110203022 | Amanda Hubbard | Strong runaways, before LHCD. Railed all the ECE. Early shutdown.
Note LHCD keeps Vloop negative as Ip drops. Take a break and fix DNB CAMAC. Now HXR is having data troubles "Overheating". These February heat waves are tough to handle... stay tuned, there will eventually be a shot. |
| Feb 3 2011 04:00:54:270PM | 1110203023 | Amanda Hubbard | Good plasma (until 1 sec), clean LH at 0.4ish MW and ICRF at at 2.5 MW, as requested. For some reason did not get an H-mode until LH off at 0.8, despite comparable density etc to shot 21. Will at least be a useful ne/RF scan in L-mode.
Retry with more ICRF. |
| Feb 3 2011 04:02:55:387PM | 1110203024 | Amanda Hubbard |
H-mode not until 0.58 s, despite clean 3 MW ICRF. By this time sawteeth have long since returned. Suspect density may be a little too low (4 e19 at ICRF on) so raise it. Limiter is getting warm, may contribute to the disruption? |
| Feb 3 2011 04:19:57:460PM | 1110203025 | Amanda Hubbard | Got the H-mode back, and it was a decent one (while it lasted). 58 kJ, nebar 1.65e20. But soon thereafter there was an injection, and RF tripped; I think we are heating something though the infrared looks OK.
Back off on ICRF power (to 2.5 MW as on shot 21). Will be a better comparison for shot 21 and hopefully keep things cooler. Just noticed that on this shot sawteeth returned a little BEFORE the ICRF turnon (0.48 s), perhaps due to higher density/less LHCD. The L-H transition is very gradual/indistinct, we've seen this before with LHCD. (circa 1080414) |
| Feb 3 2011 04:57:58:103PM | 1110203026 | Amanda Hubbard | Lost the H-mode, despite quite similar density to prior shots, and clean ICRF at 2.5 MW. LH and ICRF were clean, will be good for HXR comparisons - nebar 1.1 to 0.9 x 10^20. And an injection 0.66 seconds, likely related to k-limiter getting too hot at the lower ne.
|
| Feb 3 2011 04:38:04:990PM | 1110203027 | Amanda Hubbard | No power - alternator issue. Assuming we get to take the next shot, have asked Yijun to shorten ICRF pulse until we are confident we are getting an H-mode; in L-mode k limiter hit red. It is clearly a density issue, not just Ip; the H-mode shots were fine.
|
| Feb 7 2011 09:21:15:673AM | 1110203028 | Amanda Hubbard | Alternator issue shuts us down again. The plasma gods are not smiling on us. End of run - to be continued another day we hope. |
| Physics Operator Comments | |||
| Feb 3 2011 09:38:07:237AM | 1110203001 | Ron Parker | Sorry for the delay, lots of reprogramming required for the first shot, trouble with updating predictors.
|
| Feb 3 2011 09:50:49:557AM | 1110203001 | Ron Parker | Shot disrupted during current rise.
Possible problems: Too much gas, reduce from 50 to 40 ms Too negative IC_EF4, reduce from -1325 to -1300 |
| Feb 3 2011 10:09:03:753AM | 1110203002 | Ron Parker | Shot 2 started up better, but disrupted at ~ 1.1 s
Also, segment 1 current was greater than segment 2 program at 0.1 s. We'll fix this by increasing the segment 2 demand at 0.1 s to match the current produced by segment 1 at that time. Meanwhile, there was pickup from ICRF to magnetics, requiring a cell access to check out. |
| Feb 3 2011 10:26:50:123AM | 1110203003 | Ron Parker | Shot 3 disrupted very early, a quasi-fizzle.
Changes: Increase IC_EF4U from -1300 to -1290 Reduce flattop value of PG3 in Segment 1 from 40 V to 30 V. |
| Feb 3 2011 10:47:12:523AM | 1110203004 | Ron Parker | Again disrupted at ~ 1.1 s, very elongated, almost limited on upper shelf!
Changes: Reduce ZXU by 1 cm and raise ZXL up by 1 cm |
| Feb 3 2011 10:48:44:490AM | 1110203005 | Ron Parker | Fizzle, likely due to previous disruption.
Previous changes didn't get loaded, but fizzzle prevented it from getting that far. |
| Feb 3 2011 11:22:20:730AM | 1110203006 | Ron Parker | Shot 6 disrupted at t ~ 0.6
Changes: Try to stay in lower null by using 1100106030 without swing to upper null. |
| Feb 3 2011 11:30:49:773AM | 1110203007 | Ron Parker | Shot 7 fizzled.
Try setting RCUR Offset to 1000 in Segment 1 |
| Feb 3 2011 11:29:42:440AM | 1110203008 | Ron Parker | Shot 8 fizzled.
Reset RCUR Offset to 3500 in Segment 1 |
| Feb 3 2011 11:42:28:817AM | 1110203009 | Ron Parker | Shot 9 fizzled, but RCUR offset change wasn't loaded.
Try again with RCUR Offset at 3500. |
| Feb 3 2011 12:06:25:157PM | 1110203010 | Ron Parker | Shot 10 started up (barely) but disrupted at ~ 1 s during LH.
Next: Increase EF3 voltage knots in segment 1 to 2800 at 5 ms, 2800 at 12 ms and 2550 at 20 ms. |
| Feb 3 2011 12:08:15:983PM | 1110203011 | Ron Parker | Shot 11 fizzled, try again. |
| Feb 3 2011 12:29:54:777PM | 1110203012 | Ron Parker | Shot 12 ran until rampdown.
Changes: Reduce density target to 6.0e19 from 7.5; reduce outer gap by ~ 1 cm after ~ 0.9s, reduce PG3 gas in segment 1 from 100 volts to 50 on first knot. |
| Feb 3 2011 12:38:54:673PM | 1110203013 | Ron Parker | Shot 13 ran, reached half way into rampdown.
Startup still a bit ratty, reduce PG 3 still further for next shot. |
| Feb 3 2011 12:52:02:420PM | 1110203014 | Ron Parker | A dud! EF1 commutation failure. |
| Feb 3 2011 01:10:08:750PM | 1110203015 | Ron Parker | Shot 15 disrupted at 0.57 s, but was in toouble before that. Maybe LH problems.
Increase outer gap early, also modify RCUR programming near commutation. |
| Feb 3 2011 01:18:37:073PM | 1110203016 | Ron Parker | Fizzle. May be due to disruption on shot 15. |
| Feb 3 2011 01:33:05:327PM | 1110203017 | Ron Parker | Shot 17 ran full length, as did the LH.
|
| Feb 3 2011 01:47:47:193PM | 1110203018 | Ron Parker | Another fizzle. Add 5 ms more PG 4, from 50 to 55 ms. |
| Feb 3 2011 02:07:45:807PM | 1110203019 | Ron Parker | Shot 19 ran full length. OK for LH, clear voltage drop. |
| Feb 3 2011 02:15:18:390PM | 1110203020 | Ron Parker | Shot 20 ran full length, but was ugly (locked mode?) during the LH phase.
Try again, raise n back to programmed value for shot 19. |
| Feb 3 2011 02:28:26:860PM | 1110203021 | Ron Parker | Shot 21 ran full length, LH had several trips, ICRH "kills" fast electrons. |
| Feb 3 2011 02:50:15:693PM | 1110203022 | Ron Parker | Runaway shutdown!
Next: Increase PG3 puff at commutation. |
| Feb 3 2011 03:22:43:670PM | 1110203022 | Ron Parker | Delay is due to data acquisition problems, particularly with hard X-ray camera. |
| Feb 3 2011 03:54:45:067PM | 1110203023 | Ron Parker | Shot 23 started up well, disrupted just after 1 s |
| Feb 3 2011 03:59:56:453PM | 1110203024 | Ron Parker | Shot 24 again started up well, but disrupted around 0.7 s
We'll increse density a bit to encourage H-mode. |
| Feb 3 2011 04:03:30:120PM | 1110203025 | Ron Parker | Disruption earlier, at 0.6 s |
| Feb 3 2011 04:30:58:910PM | 1110203026 | Ron Parker | Shot 25 ran full length, but no H-mode. |
| Feb 3 2011 04:35:26:280PM | 1110203027 | Ron Parker | Shot 27 was a no power shot -- we lost the alternator due to a vibration issue.. |
| Feb 3 2011 04:53:37:617PM | 1110203028 | Ron Parker | Again, alternator lost due to a vibration problem. End of run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:37:57:877AM | Plasma | Ok | |
| 2 | 09:52:00:613AM | Plasma | Ok | |
| 3 | 10:15:12:513AM | Plasma | Ok | |
| 4 | 10:29:06:543AM | Plasma | Ok | |
| 5 | 10:41:42:773AM | Plasma | Ok | |
| 6 | 10:54:03:230AM | Plasma | Ok | |
| 7 | 11:08:23:547AM | Plasma | Ok | |
| 8 | 11:21:04:430AM | Plasma | Ok | |
| 9 | 11:34:32:337AM | Plasma | Ok | |
| 10 | 11:47:18:870AM | Plasma | Ok | |
| 11 | 12:00:17:777PM | Plasma | Ok | |
| 12 | 12:14:08:883PM | Plasma | Ok | |
| 13 | 12:28:34:733PM | Plasma | Ok | |
| 14 | 12:42:13:677PM | Plasma | Bad | EF1L commutated early |
| 15 | 12:55:35:207PM | Plasma | Ok | PF Breaker opened after disruption |
| 16 | 01:08:09:953PM | Plasma | Ok | |
| 17 | 01:23:29:290PM | Plasma | Ok | |
| 18 | 01:39:46:910PM | Plasma | Ok | |
| 19 | 01:53:23:863PM | Plasma | Ok | |
| 20 | 02:06:57:003PM | Plasma | Ok | |
| 21 | 02:20:29:670PM | Plasma | Ok | |
| 22 | 02:44:34:943PM | Plasma | Ok | |
| 23 | 03:33:01:310PM | Plasma | Ok | |
| 24 | 03:48:05:060PM | Plasma | Ok | |
| 25 | 04:00:45:797PM | Plasma | Ok | |
| 26 | 04:17:35:917PM | Plasma | Ok | |
| 27 | 04:31:43:683PM | Plasma | Bad | No Power Alternator vibration alarm |
| 28 | 04:48:07:837PM | Plasma | Bad | Alternator bearing vibration no power shot |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Feb 3 2011 09:37:37:607AM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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