| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Brian Labombard |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Bill Cochran,Bill Parkin,Bill Byford |
| Engineering Operator Run Comment |
| Purpose: MP 335 - Edge Plasma Flows in Upper Verus Lower X Point Dischar |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:33:333PM |
| Author: Brian Labombard |
| Run Summary for 1030619 - MP#335: "Edge plasma flows in upper versus lower x-point discharges" Session Leader: B. LaBombard Physics Operator: S. Wolfe ________________________________________________________________________________ Run Plan Purpose: The primary purpose of these experiments is to investigate the sensitivity of the magnitude and direction of the parallel plasma flows (routinely observed in the edge plasma) to the magnetic geometry, in particular upper, lower and double-null configurations. Shot Plan: Good recent starting points are 1030429022 (SNU) and 1030502019 (SNL) which are nominally 0.8 MA, 5.3 tesla discharges. Inner and outer gaps should be 1.2 cm. This will allow the ISP to reach the separatrix. All shots are 0.8 MA, 5.3 tesla discharges. Shot#1-3 NL04 = 1.0x10^20 m^-2 with SNL geometry A shot like 1030502019 would be a good starting point, with inner/outer gaps adjusted to 1.2 cm. Tweak equilibrium and FSP/ASP/ISP targets. Adjust outer strike point to be near outer divertor probe #3. Shot#4-6 NL04 = 1.0x10^20 m^-2 with SNU geometry A shot like 1030429022 would be a good starting point, with inner/outer gaps adjusted to 1.2 cm and plasma current bumped up slightly to 0.8 MA. SSEP should also be increased to 1.5 cm. Tweak equilibrium and FSP/ASP/ISP target. Begin density scan with four shots at each density, 2 in SNU and 2 in SNL. Shot#7,8 - NL04 = 0.8, SNU Switch to SNL 9,10 - NL04 = 0.8, SNL 11,12 - NL04 = 0.6, SNL Switch to SNU 13,14 - NL04 = 0.6, SNU 15,16 - NL04 = 1.2, SNU Switch to SNL 17,18 - NL04 = 1.2, SNL Begin density scan in DN configuration. Shot#19,20,21 - NL04 = 1.0, DN Adjust SSEP for balanced double-null. Tweak equilibrium and FSP/ASP/ISP target. 21,22 - NL04 = 0.8, DN 23,24 - NL04 = 0.6, DN 25,26 - NL04 = 1.2, DN ________________________________________________________________________________ Results It was a very painful run with 18 fizzles. We only got 5 shots with all probes operating at good target positions. Nevertheless, strong parallel plasma flows were detected on the inner wall probe (ISP), always directed toward the inner divertor strike point (down for SNL, up for SNU - reminiscent of the Jablonski inner-wall plume results), while the outer midplane probe (ASP) detected little or no flow at NL04=1 (SNL or SNU) and NL04=.8 (SNU) and a flow in the co-current direction for NL04=0.6 (SNU). The latter co-current flow for low NL04 has been seen previously in SNL discharges, suggesting that the mechanism responsible for it is independent of x-point location. We were not able to run the matching SNL discharge to verify the result today. Also, no double null discharges were run. The Chromex spectrometer saw some significant doppler shifts in the HeII line (He was puffed from NINJA on inner and outer midplane) from both inner and outer fiber views, corresponding to Mach numbers in the ~.2 range. This should allow us to get an independent estimate of the local flow velocities. Boron spectra did not yield any flow information today. There was some excitement about the blobs seen on the PSI camera; they appeared to drift down in SNL discharges but drift up in some SNU discharges, suggesting that the flow fields (across B and/or parallel to B) had changed in a way that influences the blob motion. It is not clear yet if the SOL profiles are modified (e.g., longer scrape-off length) in SNU vs SNL discharges, a detailed analysis is required. However, there was an indication that the RMS fluctuation level on the floating potential (ASP) increased in SNU discharges. This result makes contact with a similar observation on normal versus reversed Bt discharges in SNL configuration. John reported that HIREX detected some changes in core rotation in going from SNL to SNU discharges, but that the changes have been small so far. Clearly we need to beg for more run time. The flows and SOL changes are unambiguous and being readily detected by the diagnostics. All the SOL diagnostics are presently in working order (e.g., probes are NOT toasted yet). We simply need the discharges to map out the physics. Shots for analysis: 6,7 Lower single null, NL04=1 16 Upper single null, NL04=1 21 Upper single null, NL04=.8 26 Upper single null, NL04=.6 => but no ASP data! 27 Upper single null, NL04=.6, 6 tesla => ISP did not scan past 90 degrees! 31 Upper single null, NL04=.6 ________________________________________________________________________________ Detailed shot log: Shot 1 - No probes scanning. NL04 ~ .9 Shot 2 - FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 1 ASP not scanning. ASP, ISP targets are good Shot 3 - fizzle Shot 4 - fizzle Shot 5 - ASP, FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 1, bumped up to 1.08 by NINJA ISP: pulse=25ms, V=13.5 volts ISP swings 180 but gets hot on first scan. Shot 6 - ASP, FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 1, slight bump up by NINJA ISP: pulse=25ms, V=13.5 volts ISP swings 180, stays cool. Data look good on all probes. YAG is off line for the rest of the day -> overheating because air conditioning is off. Shot 7 - ASP, FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 1, slight bump up by NINJA ISP: pulse=25ms, V=13.5 volts ISP swings 180, stays cool. Again data look good on all probes. Shot 8 - Upper single null ASP, FSP scanning at .8, 1, 1.2 s. NL04 ~ 1? - TCI problems ASP hits LCFS, FSP way out. ISP not scanning Looks like the RMS Vf fluctuation levels are higher at the ASP location in SNU vs. SNL discharge - similar to earlier finding for reversed vs. normal Bt SNL discharges. Shot 9 - fizzle Shot 10 - fizzle Shot 11 - fizzle Shot 12 - fizzle Shot 13 - fizzle Shot 14 - fizzle Shot 15 - no power shot Shot 16 - Upper single null ASP scanning at .8, 1, 1.2 s. NL04 ~ 1 and rising during NINJA puff ASP in far SOL FSP, ISP not scanning Shot 17 - fizzle Shot 18 - fizzle Shot 19 - fizzle Shot 20 - fizzle Shot 21 - Upper single null ASP, FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 1 and rising during NINJA puff Data look good on all probes Strong counter-current flow on ISP detected. (which is opposite to SNL case). Shot 22 - fizzle Shot 23 - fizzle Shot 24 - Upper single null ASP, FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 0.8 and rising during NINJA puff still strong counter-current flow on ISP detected. (which is opposite to SNL case). ASP and FSP go deep but survive Shot 23 - fizzle Shot 26 - Upper single null FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 0.6 and rising during NINJA puff counter-current flow on ISP detected. ISP, FSP data look good => ASP did not scan!! Shot 27 - Upper single null, 6 tesla ASP, FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 0.6 and rising during NINJA puff ISP did NOT swing past 90 degrees (need re-run ISP_Angle program on this shot) probe data look good. shot 28: - fizzle shot 29: - fizzle shot 30: - fizzle Shot 31 - Upper single null, 5.4 tesla ASP, FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 0.6 and rising during NINJA puff All probe data look good. Usual co-current flow detected on ASP near separatrix. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:18:427PM |
| Author: Steve Wolfe |
| Physics Operator Summary for Thursday, 6/19/2003 MP#335 - Edge plasma flows in upper verus lower x-point discharges SL: LaBombard PO: Wolfe EO: Cochran, Byford, Parkin (the Bills) Engineering Setup: ------------------ NO Overnight ECDC Power Systems as on 1030502019 Except C-Coil as on 1030528030 [+Dtop,-Dbot,-Jtop,+Jbot] Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) Enable the following gate valves, assuming no vacuum problems: ECE, DNB, VUV Run Plan --------- All shots are 0.8 MA, 5.3 tesla discharges. except that we will take one shot or test at 6.5T to determine whether the replacement of a relay in the TF2 breaker has fixed the problem observed last week at high TF; 6.1T is required for Friday's scheduled run. Shot#1-3 NL04 = 1.0x10^20 m^-2 with SNL geometry A shot like 1030502019 would be a good starting point, with inner/outer gaps adjusted to 1.2 cm. Tweak equilibrium and FSP/ASP/ISP targets. Adjust outer strike point to be near outer divertor probe #3. Shot#4-6 NL04 = 1.0x10^20 m^-2 with SNU geometry A shot like 1030429022 would be a good starting point, with inner/outer gaps adjusted to 1.2 cm and plasma current bumped up slightly to 0.8 MA. SSEP should also be increased to 1.5 cm. Tweak equilibrium and FSP/ASP/ISP target. Begin density scan with four shots at each density, 2 in SNU and 2 in SNL. Shot#7,8 - NL04 = 0.8, SNU Switch to SNL 9,10 - NL04 = 0.8, SNL 11,12 - NL04 = 0.6, SNL Switch to SNU 13,14 - NL04 = 0.6, SNU 15,16 - NL04 = 1.2, SNU Switch to SNL 17,18 - NL04 = 1.2, SNL Begin density scan in DN configuration. Shot#19,20,21 - NL04 = 1.0, DN Adjust SSEP for balanced double-null. Tweak equilibrium and FSP/ASP/ISP target. 21,22 - NL04 = 0.8, DN 23,24 - NL04 = 0.6, DN 25,26 - NL04 = 1.2, DN PCS Setup --------- Bring up PCS and load_from /home/wolfe/pcs_trees/pcs_1030619999, which I set up yesterday. This has the following segments: seg1 : startup from middle of the day on 1030618 seg2 : SNL from 1030502019 (plus Acoil mods) seg3 : SNU from 1030429022 (plus Acoil mods) seg4 : DN w/SSEP from 1021107004 (plus Acoil mods) Brian wants the left gap moved to 1.2cm, while 1030502019 had 1.7 to 1.8cm so, in seg2: clearin down by 5mm, rcur down by 2.5mm 1030429022 had left gap of 1.0 -> 0.7 and right gap 1.0 -> 0.7 so in seg3: clearin up by 2mm at .6sec, 5mm at 1.5sec wrong! this shot has a zero offset on clearin instead of 12700. I do not want to propagate this ancient incorrect setup. I'll change the offset, call the alg, and copy the rcur and clearin waveforms from seg2; this will probably need some tweaking, but I hope it will run ok. Also, increase Ip gain from 6->9 and change Ip offset from -23000 to -30000. WHERE DID THIS COME FROM??? 1021107004 seems to have disrupted at 1.1sec, but had gaps of 1.3cm, so in seg4: clearin down by 1mm Start with seg2 turned on for lower null. Results: --------- A very difficult day. Only about 4 conditions out of 12 called for in the plan were obtained. The only good news is that the TF breaker seems to be fixed (shot #27). The AC in the cell and cooling water for YAG and other systems had been shut down by MIT Phys. Plant (supposedly a "scheduled" outage that nobody knew about), resulting in cell temps up to 80F. This adversely affected the TCI stability, and possibly other systems as well, and shut down TS after shot#6. Some cooling was later restored, and the YAG was back on for shot 25, but the cell remained hot. In addition, the decision not to ECDC overnight was probably a mistake. The run was plagued with fizzles. Gas tweaks did not help, and I ended up chasing fields which looked bad, but had worked on previous days. Whether the fizzles were the result of lack of ecdc or the fact we were running upper null plasmas, or something else, is unknown. I recommend that we go back to overnight ECDC in any case. We got started on the Lower SN shots and after some target tweaking got the first density point on the scan on shots #6,7. Shot #8 was the first Upper Null. I ended up reloading the clearin trace from the earlier shot when I realized that the CLEARIN predictor for upper null wouldn't necessarily have the same offset. Shot 8 had small and shrinking gaps, so I tried to adjust these for the next shot. Shots#9-14 all fizzled, despite lots of tweaks, some ecdc between shots, and reloading seg1 from shot#1. Shot 15 was a no-power shot due to a breaker opening in INIT. For shot #16 I raised BR0 to .001 (from -.00025 on shot1) and it ran, although the current rise was still poor and it looked like the zposition stalled and then came up; at least it wasn't going back down, as it had been on the fizzles. The gaps on 16 looked good, but the probe targets still showed some drift, and SSEP was only 5mm as I had dropped ZCUR to improve the FSP targeting. For shot 17 I put a ramp on RCUR and dropped ZXL by 2mm. Unfortunately 17 was another fizzle, as was 18 (with .5mT more positive on BR0) and 19 and 20. For 21 I had the chopper on 15msec earlier (EFC start at -.05) and dropped the efc voltage point at .02 from 800 to 600, to get early fast ZCUR. This resulted (?) in a good plasma, although the startup still looked very bad. Shot 22 was an attempt to get the second density point in Upper Null (0.8e20) and was another fizzle. It looked like the BZ was not rising, so I increased the EF3 voltage for shot 23 and 24. #24 ran, barely. Shot 25 fizzled, and for shot 26 BR0 was dropped back to .001, which ran. Shot #27 was run at higher field (180kA) to test whether the breaker relay replacement corrected the problem that happened last week at high TF. I expected it to fizzle, since we hadn't had two plasmas in a row in hours, but it ran ok. The fix seems to have worked, so the 6.1T (170kA) run for tomorrow should be ok, if the FRECE daq system is working. Shot #28 was back at 5.3T and 6e19 SNU, with the early pg3 puff dropped a little and the NINJA puff delayed. This was a fizzle, as were 29 and 30. For shot 31 I dropped BR0 from .001 to .0005 and put the EFC start back to -.035, delaying the fast ZCUR feedback, since these fizzles seemed to be thrashing vertically. For whatever reason, shot 31 ran, though with runaways, and Brian got his data for conditions of shot 13 of the plan. Scorecard ---------- No Power shots 1 Duds 0 Fizzles 18 Plasmas 12 ======= == Shots 31 |
| Session Leader Comments | |||
| Jun 19 2003 08:58:45:177AM | Brian Labombard | MP#335 - Edge plasma flows in upper verus lower x-point discharges Purpose: The primary purpose of these experiments is to investigate the sensitivity of the magnitude and direction of the parallel plasma flows (routinely observed in the edge plasma) to the magnetic geometry, in particular upper, lower and double-null configurations. Shot Plan: Good recent starting points are 1030429022 (SNU) and 1030502019 (SNL) which are nominally 0.8 MA, 5.3 tesla discharges. Inner and outer gaps should be 1.2 cm. This will allow the ISP to reach the separatrix. All shots are 0.8 MA, 5.3 tesla discharges. Shot#1-3 NL04 = 1.0x10^20 m^-2 with SNL geometry A shot like 1030502019 would be a good starting point, with inner/outer gaps adjusted to 1.2 cm. Tweak equilibrium and FSP/ASP/ISP targets. Adjust outer strike point to be near outer divertor probe #3. Shot#4-6 NL04 = 1.0x10^20 m^-2 with SNU geometry A shot like 1030429022 would be a good starting point, with inner/outer gaps adjusted to 1.2 cm and plasma current bumped up slightly to 0.8 MA. SSEP should also be increased to 1.5 cm. Tweak equilibrium and FSP/ASP/ISP target. Begin density scan with four shots at each density, 2 in SNU and 2 in SNL. Shot#7,8 - NL04 = 0.8, SNU Switch to SNL 9,10 - NL04 = 0.8, SNL 11,12 - NL04 = 0.6, SNL Switch to SNU 13,14 - NL04 = 0.6, SNU 15,16 - NL04 = 1.2, SNU Switch to SNL 17,18 - NL04 = 1.2, SNL Begin density scan in DN configuration. Shot#19,20,21 - NL04 = 1.0, DN Adjust SSEP for balanced double-null. Tweak equilibrium and FSP/ASP/ISP target. 21,22 - NL04 = 0.8, DN 23,24 - NL04 = 0.6, DN 25,26 - NL04 = 1.2, DN | |
| Jun 19 2003 09:10:35:897AM | 1030619001 | Brian Labombard | Shot 1 - No probes scanning. NL04 ~ .9 Next: set up probes to scan .8, 1, 1.2 seconds tweak outer gap and ZXL programming |
| Jun 19 2003 09:29:50:113AM | 1030619002 | Brian Labombard | Shot 2 - FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 1 ASP not scanning. ASP, ISP targets are good Next: smaller RXL, 2mm larger inner gap, scan all probes, puff NINJA starting at .9 seconds |
| Jun 19 2003 10:21:59:037AM | 1030619005 | Brian Labombard | Shot 5 - ASP, FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 1, bumped up to 1.08 by NINJA ISP: pulse=25ms, V=13.5 volts ISP swings 180 but gets hot on first scan. Next: repeat with FSP deeper, ISP - more gap, ASP deeper with less positive bias |
| Jun 19 2003 10:41:13:770AM | 1030619006 | Brian Labombard | Shot 6 - ASP, FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 1, slight bump up by NINJA ISP: pulse=25ms, V=13.5 volts ISP swings 180, stays cool. Data look good on all probes. Next: repeat |
| Jun 19 2003 10:43:16:570AM | 1030619006 | Brian Labombard | Shot 6 - Jerry says YAG is off line for the rest of the day -> overheating because air conditioning is off. |
| Jun 19 2003 10:54:16:617AM | 1030619007 | Brian Labombard | Shot 7 - ASP, FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 1, slight bump up by NINJA ISP: pulse=25ms, V=13.5 volts ISP swings 180, stays cool. Again data look good on all probes. Next: Go to upper single null discharge. |
| Jun 19 2003 11:54:14:790AM | 1030619008 | Brian Labombard | Shot 8 - Upper single null ASP, FSP scanning at .8, 1, 1.2 s. NL04 ~ 1? - TCI problems ASP hits LCFS, FSP way out. ISP not scanning Looks like the RMS Vf fluctuation levels are higher at the ASP location in SNU vs. SNL discharge - similar to earlier finding for reversed vs. normal Bt SNL discharges. Next: tweak gaps, move plasma down, move FSP in |
| Jun 19 2003 01:33:52:567PM | 1030619016 | Brian Labombard | Shot 16 - Upper single null ASP scanning at .8, 1, 1.2 s. NL04 ~ 1 and rising during NINJA puff ASP in far SOL FSP, ISP not scanning Next: Scan FSP and ISP, tweak inner outer gaps to be flatter versus time. |
| Jun 19 2003 02:40:19:030PM | 1030619021 | Brian Labombard | Shot 21 - Upper single null ASP, FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 1 and rising during NINJA puff Data look good on all probes Strong counter-current flow on ISP detected. (which is opposite to SNL case). Next: Go to NL04 ~ 0.8 |
| Jun 19 2003 03:49:17:620PM | 1030619024 | Brian Labombard | Shot 24 - Upper single null ASP, FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 0.8 and rising during NINJA puff still strong counter-current flow on ISP detected. (which is opposite to SNL case). ASP and FSP go deep but survive Next: Go to NL04 ~ 0.6 |
| Jun 19 2003 03:55:59:770PM | 1030619026 | Brian Labombard | Shot 26 - Upper single null FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 0.6 and rising during NINJA puff counter-current flow on ISP detected. ISP, FSP data look good => ASP did not scan!! Next: repeat at Bt=6.1 tesla |
| Jun 19 2003 05:27:56:363PM | 1030619027 | Brian Labombard | Shot 27 - Upper single null, 6 tesla ASP, FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 0.6 and rising during NINJA puff ISP did NOT swing past 90 degrees (need re-run ISP_Angle program on this shot) probe data look good. Next: repeat at Bt=5.4 tesla |
| Jun 19 2003 05:58:00:490PM | 1030619031 | Brian Labombard | Shot 31 - Upper single null, 5.4 tesla ASP, FSP, ISP scanning at .8, 1, 1.2 s. NL04 ~ 0.6 and rising during NINJA puff All probe data look good. Usual co-current flow detected on ASP near separatrix. |
| Physics Operator Comments | |||
| Jun 18 2003 09:36:37:567AM | Steve Wolfe | Begin setting up for Run on 1030619, MP#335 (Flows in SNL, SNU, DN) Brian is going to want LN, UN and SSEP control for near-double. Set up seg2 from 1030502019 SNL seg3 from 1030429022 SNU seg 4 from 1021107004 SSEP, near-double. Build all with each segment on in turn; got factor warnings on a few wires. Save as /home/wolfe/pcs_trees/pcs_1030619999.* | |
| Jun 18 2003 03:56:47:807PM | Steve Wolfe | Modified the saved shot /home/wolfe/pcs_trees/pcs_1030619999 to have an A-coil current waveform in each of segs 2,3,4. Note that pasting from a scope into the ALL_V widget seems to be broken again; it gives garbage in the pasted panel. | |
| Jun 19 2003 08:20:30:770AM | Steve Wolfe | Slight delay in getting setup this morning because the front table linux boxes had an NIS problem. Woke jas up and he fixed it from home. Bring up PCS and load_from /home/wolfe/pcs_trees/pcs_1030619999, which I set up yesterday. This has the following segments: seg1 : startup from middle of the day on 1030618 seg2 : SNL from 1030502019 (plus Acoil mods) seg3 : SNU from 1030429022 (plus Acoil mods) seg4 : DN w/SSEP from 1021107004 (plus Acoil mods) Brian wants the left gap moved to 1.2cm, while 1030502019 had 1.7 to 1.8cm so, in seg2: clearin down by 5mm, rcur down by 2.5mm 1030429022 had left gap of 1.0 -> 0.7 and right gap 1.0 -> 0.7 so in seg3: clearin up by 2mm at .6sec, 5mm at 1.5sec wrong! this shot has a zero offset on clearin instead of 12700. I do not want to propagate this ancient incorrect setup. I'll change the offset, call the alg, and copy the rcur and clearin waveforms from seg2; this will probably need some tweaking, but I hope it will run ok. Also, increase Ip gain from 6->9 and change Ip offset from -23000 to -30000. WHERE DID THIS COME FROM??? 1021107004 seems to have disrupted at 1.1sec, but had gaps of 1.3cm, so in seg4: clearin down by 1mm Start with seg2 turned on for lower null. Load/clean : one factor screen and p13seg1 name time message. Load/clean again Load at 19-Jun-2003 08:19:49.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| Jun 19 2003 08:44:15:333AM | Steve Wolfe | Set up all segments for nl4=9e19 (aiming for 1e20, we've been getting a little higher than we ask for. Also make pg3 demands all the same (copy from seg3) load/clean Load at 19-Jun-2003 08:44:00.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| Jun 19 2003 09:07:04:240AM | 1030619001 | Steve Wolfe | shot#1: bouncy startup, full length plasma. outer gap is moving from 1.1 to 1.4cm nl4 at .9e20 next shot: seg2 rcur in by 1mm early, out by 1mm late pg4 from 23ms->25ms nl4 to 1e20 |
| Jun 19 2003 09:22:01:210AM | 1030619002 | Steve Wolfe | shot#2: seg2 rcur in by 1mm early, out by 1mm late pg4 from 23ms->25ms nl4 to 1e20 also drop endpoint on zxl by 5mm to adjust fsp target plasma, full length, still bouncy startup and hards. outer gap is better, still not perfectly flat. outer strike still rising, but less so; it is too high on the plate next shot: raise pg4 from 25 to 28msec decrease rxl by 1cm |
| Jun 19 2003 09:36:07:310AM | 1030619003 | Steve Wolfe | shot#3:raise pg4 from 25 to 28msec decrease rxl by 1cm increase clearin 2mm, rcur 1mm (late change requested by SL) fizzle. too much gas. next shot: drop pg4 back to 25msec |
| Jun 19 2003 09:54:07:243AM | 1030619004 | Steve Wolfe | shot#4: drop pg4 back to 25msec same gaps, rxl settings as last time. fizzle, lots of bounces. pressure dropped a lot (from 90 to 75uTorr) pg4 to 27msec, ef4u from -1320 to -1310 |
| Jun 19 2003 10:23:10:053AM | 1030619005 | Steve Wolfe | shot 5: pg4 to 27msec, ef4u from -1320 to -1310, br0 from -.00025 to .00025 plasma disrupted at 1.7sec. isp glowing, needs more gap density rising. |
| Jun 19 2003 10:30:30:970AM | 1030619006 | Steve Wolfe | shot#6: drop pg3 maint level negative to compensate ninja density rise. another 1.5mm increase on clearin, .75mm on rcur. plasma, 1.9sec inner gap got bigger by 1-2mm, as requested. current rise is a slower, nearly went in next shot: drop pg4 from 27->25msec otherwise repeat to make sure they have this data point before going on to SNU |
| Jun 19 2003 10:43:48:930AM | 1030619007 | Steve Wolfe | shot#7: drop pg4 from 27->25msec otherwise repeat to make sure they have this data point before going on to SNU Thomson reports it is off for the day due to the cooling problem (MIT Phys. Plant) plasma, full length. startup still begins to turn in. next shot: drop pg4 to 23msec. Go to SNU (segment 3) |
| Jun 19 2003 10:58:58:610AM | 1030619007 | Steve Wolfe | Short (I hope) delay while JHI tries to get the tci alignment back, so we can use density feedback (and know what density is). The cell AC is still off, and the temp is rising. |
| Jun 19 2003 11:07:52:047AM | 1030619008 | Steve Wolfe | shot#8: drop pg4 to 23msec. Go to SNU (segment 3) paste nl4 and pg3 from seg2 to seg3 reload wire 4 (clearin) from 1030619999, since I don't know what the offset should be for Upper Null (shouldn't be 12700 after all, probably) Leave RCUR where it was, we'll have to deal with the gaps later. plasma full length looked upper null, almost lost it on startup, bouncing. lost tci feedback around 1.3sec both gaps are too small/ 6mm outer, 1.2->.7cm inner |
| Jun 19 2003 11:34:06:727AM | 1030619009 | Steve Wolfe | shot#9: increase clearin at at .414 from -.015 to -.01 and 1.5sec from -.015 to -.005 and eliminate knots between .414 and 1.5sec Move rxu in by 1cm at 1.4 sec to try to keep strike off gusset drop zcur from .01 to 0.00 to improve fsp target fizzle. This time it lookes like it moved in, which doesn't make sense. next shot: pg4 to 21msec, ef4 back to -1320 |
| Jun 19 2003 12:05:12:167PM | 1030619011 | Steve Wolfe | shot#10: pg4 to 21msec, ef4 back to -1320 all else same as for 9. Jim is having to go into cell to tend tci every shot. INIT after ~17min fizzle. Looks bouncy but I'm not sure. pg4 back to 23msec. |
| Jun 19 2003 12:06:03:870PM | 1030619011 | Steve Wolfe | shot#11: pg4 back to 23msec Third fizzle in a row, this one definitely bounces. 5 minutes of ecdc before next shot. |
| Jun 19 2003 12:27:19:043PM | 1030619012 | Steve Wolfe | shot#11: pg4 back to 23msec Third fizzle in a row, this one definitely bounces. 5 minutes of ecdc before next shot. init at 3.0e-6Torr another fizzle! No current rise |
| Jun 19 2003 12:37:57:090PM | 1030619013 | Steve Wolfe | shot#13: No changes, just let the pressure come on down and go again another fizzle. reload seg1 from shot#1 |
| Jun 19 2003 12:55:55:510PM | 1030619014 | Steve Wolfe | shot#14:reload seg1 from shot#1. The only difference should be the BR_0, I think. No help. Initial current rise is fast, but it doesn't look like it bounces, it turns around and goes in. The z-position looks terrible, very low, rising then going back down. maybe a litle worse than 13. I'm going to try going the other way on Br0. I don't know what else to try. |
| Jun 19 2003 01:02:33:970PM | 1030619015 | Steve Wolfe | shot#15: Br0 from -.00025 to .001 NO POWER SHOT - PF BREAKER opened in INIT |
| Jun 19 2003 01:25:28:383PM | 1030619016 | Steve Wolfe | shot#16: Br0 from -.00025 to .001 plasma, full length - FINALLY! gaps look pretty good but SSEP is down to +5mm Need to either drop ZXL or raise ZCUR. |
| Jun 19 2003 01:36:56:353PM | 1030619017 | Steve Wolfe | shot#17:Drop ZXL by .02 to -.04 ramp rcur out by 4mm. BR may still be too negative, but leave it for this shot. fizzle. Raise br0 another .5mT |
| Jun 19 2003 01:54:00:817PM | 1030619018 | Steve Wolfe | shot#18: Raise br0 another .5mT to .0015 fizzle. |
| Jun 19 2003 02:07:03:197PM | 1030619019 | Steve Wolfe | shot#19: raise pg4 to 25msec another fizzle. This one looks different; it hesitates, then rises to 66kA and then runs outside. next shot: ef4 back to -1310 and raise pg4 again to 27msec |
| Jun 19 2003 02:11:19:593PM | 1030619019 | Steve Wolfe | shot#19: raise pg4 to 25msec another fizzle. This one looks different; it hesitates, then rises to 66kA and then runs outside. next shot: ef4 back to -1310 and raise pg4 again to 27msec move efc start time to -.05sec to pick up fast zcur earlier. |
| Jun 19 2003 02:38:19:557PM | 1030619021 | Steve Wolfe | shot#21: chopper votage to 600V at 20msec plasma full length Still a lousy startup, but it went. next shot: drop the gas back to 25msec, drop nl4 to 8e19 (shot 7 from the plan) |
| Jun 19 2003 02:51:10:937PM | 1030619022 | Steve Wolfe | shot#22:drop the gas back to 25msec, drop nl4 to 8e19 (shot 7 from the plan) And another fizzle!!!! Bz is not coming up and zcur is going back down. next shot: Try raising ef3 voltage at 20msec point from 2250 to 2600 I'm getting a long way from the startups that worked yesterday. |
| Jun 19 2003 03:10:42:967PM | 1030619023 | Steve Wolfe | shot#23:Try raising ef3 voltage at 20msec point from 2250 to 2600 I'm getting a long way from the startups that worked yesterday. fizzle. raise the 5msec point on ef3 to 2800 from 2600. If this doesn't work I'm going to go back to shot 1 again. |
| Jun 19 2003 03:26:18:680PM | 1030619024 | Steve Wolfe | shot#24:raise the 5msec point on ef3 to 2800 from 2600. If this doesn't work I'm going to go back to shot 1 again. plasma full length. current still turns around at 15msec, but makes it. next shot: drop density to 6e19. PCS gave floating overflow errors when I touched the nl4 trace in the all_p's screen, but it seemed to do it ok. |
| Jun 19 2003 03:34:13:190PM | 1030619025 | Steve Wolfe | shot#25: drop density to 6e19. PCS gave floating overflow errors when I touched the nl4 trace in the all_p's screen, but it seemed to do it ok. fizzle. The zmeter looks likes it's burning out, but CII stays up, ahd D-alpha looks like it's hitting repeatedly. Bz is still essentially flat and zero from 8-15msec. Br has drifted slightly positive. next shot: Drop Br0 back to .001 |
| Jun 19 2003 03:45:48:660PM | 1030619026 | Steve Wolfe | shot#26:Drop Br0 back to .001 plasma full length Next shot: We will now do the 6.1T TF pulse test, since it will likely be a fizzle anyway. |
| Jun 19 2003 04:04:56:487PM | 1030619027 | Steve Wolfe | shot#27:In seg3, program tf for 180000, tf plc limit to 185kA, tf fizzle delay to 1.5sec doesn't matter if this fizzles, it's just to test whether the relay replacement worked. Plasma, naturally. next shot: Back to 150kA, and drop the pg3 program early. |
| Jun 19 2003 04:19:44:837PM | 1030619028 | Steve Wolfe | shot#28: Back to 150kA, and drop the pg3 program early. fizzle. Of course. gets to 50kA. next shot: no change, just try again |
| Jun 19 2003 04:32:14:687PM | 1030619029 | Steve Wolfe | shot#29: no change, just try again Another fizzle. Almost made it, got to 68kA. next shot: drop pg4 to 23msec |
| Jun 19 2003 04:46:52:473PM | 1030619030 | Steve Wolfe | shot#30: drop pg4 to 23msec fizzle. This one actually got to 85kA and may have hit outside. Next shot: drop BR0 from .001 to .0005 |
| Jun 19 2003 04:59:27:553PM | 1030619031 | Steve Wolfe | shot#31: drop BR0 from .001 to .0005 Move EFC start time back to -.035 from -.05s (maybe it's hurting instead of helping) plasma full length. It will have to do, that's the end of the run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:56:17:350AM | Plasma | Ok | |
| 2 | 09:10:52:050AM | Plasma | Ok | |
| 3 | 09:31:23:897AM | Plasma | Ok | |
| 4 | 09:47:43:360AM | Plasma | Ok | |
| 5 | 10:01:24:130AM | Plasma | Ok | |
| 6 | 10:19:30:610AM | Plasma | Ok | |
| 7 | 10:39:19:640AM | Plasma | Ok | |
| 8 | 11:01:42:597AM | Plasma | Ok | |
| 9 | 11:27:26:887AM | Plasma | Ok | |
| 10 | 11:48:14:140AM | Plasma | Ok | |
| 11 | 12:02:00:707PM | Plasma | Ok | |
| 12 | 12:22:26:723PM | Plasma | Ok | |
| 13 | 12:35:35:227PM | Plasma | Ok | |
| 14 | 12:48:27:107PM | Plasma | Ok | |
| 15 | 01:01:05:313PM | Plasma | Bad | OH@L Converter IOC Fault |
| 16 | 01:17:45:683PM | Plasma | Ok | |
| 17 | 01:33:49:910PM | Plasma | Ok | |
| 18 | 01:46:47:527PM | Plasma | Ok | |
| 19 | 01:59:38:530PM | Plasma | Ok | |
| 20 | 02:13:12:300PM | Plasma | Ok | |
| 21 | 02:26:17:850PM | Plasma | Ok | |
| 22 | 02:39:12:370PM | Plasma | Ok | |
| 23 | 03:03:32:643PM | Plasma | Ok | |
| 24 | 03:16:33:833PM | Plasma | Ok | |
| 25 | 03:29:20:387PM | Plasma | Ok | |
| 26 | 03:42:19:233PM | Plasma | Ok | |
| 27 | 04:01:35:043PM | Plasma | Ok | |
| 28 | 04:16:02:427PM | Plasma | Ok | |
| 29 | 04:29:02:180PM | Plasma | Ok | |
| 30 | 04:41:53:620PM | Plasma | Ok | |
| 31 | 04:54:44:923PM | Plasma | Ok | |