Miniproposals

Miniproposal: 653b Date Filed: 1/12/2012 Title: Hidden variables in Neo-Alcator scaling First Author: Darin Ernst Session Leader: Darin Ernst (shots 1-32)

Engineering Operator Run Comment

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Session Leader Plans

Entered: Feb 7 2012 12:09:08:307AM

Author: Darin Ernst

MP653B Hidden Variables in Neo-Alcator Scaling There will be a boronization Monday night, which may make density control more difficult at low densities (while D2 outgasses from the walls). We will use extended post-boronization ECDC to try to get the density down. We have re-arranged the plan in the MP to place higher densities and heating powers first. Increase Ip to 1.0 MA so the LOC-SOC transition occurs near nebar ~ 1.e20 m-3 (nl04 ~ 0.67). This widened LOC regime at higher current is more important than reducing the effect of sawteeth (by running at 0.5 MA). This should help us obtain useful scan data even if very low densities cannot be attained. Conditions: 5.4 T, 1.0 MA, Cryopump, LSN HIREX Sr: Plan for B-side lower puff 40-100ms Ar., 20ms sampling. We do not have the DNB today: no MSE, core CXRS, edge CXRS Er. Establish LSN operation at 5.4 T, 1.0 MA, elongation ~ 1.6, nl04 = 1.0, ohmic heating. Add He puff for GPI. Add 40ms B-side lower Ar puff for HIREX Sr. Check HIREX Sr. data quality. Increase Ar puff to as much as 100 ms if needed (USN will pump out more Ar). Add J-port and D-port 1 MW to condition. Shot A: ____________ If locked modes have not occurred, take a locked mode shot for HIREXSr. (1 shot) Shot B: ____________ With target density nel20 = 1.0, ramp J-port RF power in 0.2MW increments, 100ms each step, starting at end of current ramp. Add D-port power when J-port reaches maximum (~1.4MW). Watch for rotation reversals and spectral changes in PCI (expected). Watch for increases in Zeff and Prad. Shot C1: ____________ If rotation reversal is seen, smoothly ramp J-port power (rather than in steps), over a range (TBD) encompassing the rotation reversal. Shot C2: ____________ Repeat, adding RF modulation 20ms on/20ms off, smoothly ramping J-port peak power. Shot C3: ____________ Ramp density from nl04=0.8 to nl04=0.4 over 800ms to document LOC-SOC transition via rotation reversal. Shot D1: ____________ Critical Density: _____________ (expect nl04=0.67, nebar=1.0) Add 1 MW continuous J-port power and repeat density ramp, expecting ~40% decrease in critical density (if LSN, not USN). Shot D2: ____________ Critical Density: _____________ (expect nl04=0.48, nebar=0.71) Lower J-port power to 0.5MW continuous and repeat density ramp, expecting ~20% decrease in critical density. Shot D3: ____________ Critical Density: _____________ (expect nl04=0.55, nebar=0.82) Ramp density upward from nl04=0.3 to nl04=0.8 over 1000ms without RF heating. Shot D4: ____________ Critical Density: _____________ (expect nl04=0.67, nebar=1.0) Scan 3: ohmic density scan nl04 = 0.8, 0.6, 0.5, 0.45, 0.4, 0.3 Shot E80: _____________ Shot E60: _____________ Te=_______ Ti=__________ Ti/Te=__________ Shot E50: _____________ Te=_______ Ti=__________ Ti/Te=__________ Shot E45: _____________ Te=_______ Ti=__________ Ti/Te=__________ Shot E40: _____________ Te=_______ Ti=__________ Ti/Te=__________ Shot E30: _____________ Te=_______ Ti=__________ Ti/Te=__________* Scan 2: RF power scan at nl04=0.4. Increase RF J-port power on successive 100 ms steps: 0.4, 0.6, 0.8, 1.0, 1.6 MW. If impurity influx becomes problematic, may need to break into separate shots. Similar to shot C1, but at lower density. Augment with D-port at highest power if conditioned. Shot F1: ____________ Continuous J-port RF power ramp at nel20=0.4 from 0 to 1.4 MW over 1000 ms. Shot F2: ____________ Observe power required in Shots C1, C2, C3 to reach the target Te/Ti attained in Shot E30. Linearly interpolate between nl04=0.3 and nl04=1.0 to determine power required at each density to maintain constant Te/Ti. Scan 1: Scan density and RF power (using the powers obtained by interpolation above), at constant Te/Ti. Use density values nl04 = 0.4, 0.45, 0.5, 0.6, 0.8. Adjust J-port powers if needed to accomodate changes in energy confinement time. RF power constant for 300 ms, then modulated 20 ms on/20ms off, same average power. Shot G40: ____________ Power = ___________ Te/Ti = ____________ Shot G45: ____________ Power = ___________ Te/Ti = ____________ Shot G50: ____________ Power = ___________ Te/Ti = ____________ Shot G60: ____________ Power = ___________ Te/Ti = ____________ Shot G80: ____________ Power = ___________ Te/Ti = ____________ Locked mode for HIREX Sr. Shot H: ____________

Physics Operators Plans

Entered: Feb 7 2012 04:48:25:847AM

Author: Jerry Hughes

PO run plan for 1120207 MP653b "Hidden variables in Neo-Alcator scaling" SL: D. Ernst PO: J. Hughes ----------------- Engineering Setup ----------------- Run begins at 09:00 and ends at 17:00 Power systems as on: 1120118024 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 He DISABLED Enable gate-valves and shutters: ECE, VUV, HiREX Sr, Xeus Open z-bolo shutter. Torvac gatevalve toggle (yes/no): no Boronization(yes/no): YES, overnight Overnight ECDC (yes/no): post-boronization ECDC in He ICRF(yes/no): YES, all transmitters LH(yes/no): no Cryopump (yes/no): YES, available from first shot DNB (yes/no): not required Vessel temperature: 35/35/35 -------------------------- BORONIZATION request: note scan parameters are different from last time! ----------------------------- rmin/rdwell/rmax: 44/75/90 cm tdwell/tsweep: 60/120 s EF4 current: 0 A ---------------------------- Post boronization ECDC ---------------------------- Gas:He sweep: 44/45/103 cm scan: 20/120 s Pressure: 1e-4 Torr Duration: at least 3 hrs ----------------------------- Plasma setup ---------------------------- Begin with shot 1120118024 (USN, 1MA)

Session Leader Summaries

Entered: Feb 8 2012 12:58:25:103AM

Author: Darin Ernst

Successful run. The machine performed extremely well. We completed a final extravaganza scan combining three scans into one, by using three phases of the discharge in a shot-by-shot density scan. This may have met most of our plan objectives. The RF recovery from boronization required only 2-3 shots. All of the antennas were fully operational almost immediately. Did not notice any significant difference in performance between D, E, and the new field-aligned (half) J. HIREX Sr. was optimized with a maintenance Ar puff, and two locked modes were taken for calibration. The toroidal field was increased to 5.5 T for CECE, which got initial data, and the ECE grating was changed to place GPC and GPC2 channels on-axis. We chose the poison of 1.0 MA and its large sawteeth to widen the LOC range of densities, given the expected boronization recovery. Sawteeth were indeed large, but this appears to be the right choice given the difficulty in lowering the density. There were two main challenges: (1) As a result of the the overnight boronization, D2 wall outgassing prevented us from attaining densities much below the LOC-SOC critical density during the first half of the run. We finally solved this problem with three full-power RF discharges to condition the walls. (2) Once the density was reduced, our power scans were plagued by H-mode transitions in the LSN configuration, and the usual high Zeff at the lowest densities. We delayed H-Modes successfully by reducing the outer strike point leg length, but it turned out that we could not put in enough power to reach the target temperature at the high end of the density range. We solved this problem by switching to USN on shot 23 and onward. Density control was outstanding, and Zeff was much lower at lower densities as well. Some discharges were terminated by W injections until we lowered the max. power. This configuration allowed us to complete a last-minute dual scan of density and RF power (later in discharge), with density ramps generated by NINJA puffing during the RF power phase. This scan maintained Te0 = 3.1 keV as density changed from shot to shot by increasing power. The rotation reversals moved to higher densities as the power (temperature) increased relative to ohmic heating, suggesting a collisionality dependence. This final scan combines Scans 1 and 3, as well as including density ramps at each power level. Scan 2 was repeated multiple times. Overall, it appears that we may have completed the shot plan. In more detail: Shots 1-9: Initially we could not get below nel20 ~ 0.8. We repeated a discharge in the plan having an RF power ramp at a density of nel20 ~ 1.0 nine times, but made little progress in reducing the density. During this initial phase, we optimized Ar puffing for HIREX and observed reversal-like behavior during the RF power ramps. Shots 10-14: We ran a series of three discharges with full RF power to condition the walls, checking after each with a shot from the plan. This was very effective. Afterward, we consistently attained nel20 ~ 0.3. We were then able to take a locked mode shot for HIREX Sr. calibration, so we could see flow reversals. This allowed us to move on to the plan: Shot A: 2,3,10,13,14 Shot B: 12 Shot C1: 4,5 Shot C2: 6,7,8,9,15 Shot C3: skip - large saweeth made modulation unnecessary Shot D2: in final scan Shot D3: in final scan Shot D4: 15,17 Shot F1: 20 Shot F2: skip Shot E30: 22 Locked modes for HIREX Sr: 12, 21 At this point, we realized that we could not reach the Te ~ 3.0 keV, attained in the lowest density ohmic case, by heating at higher densities, without getting an H-mode first. On shot 23 we switched to USN. LSN/USN comparison at low density, E30: 22, 23 Shot D1: 24 Shot C1 at nel20=0.8: 25, 26 Final Scan: Ohmic in first phase, followed by constant RF heating phase, with NINJA puff coming 200 ms after start of RF, yielding consistent density ramps to nel20 = 1.0 during RF heating. Shots EXX, GXX: all USN nel20 Prf Te0_max Shot ------ ------ -------- ----- 0.3 0 3.1 23 0.4 350 kW 2.8 31 0.5 704 kW 3.0 32 0.6 1050 kW 3.1 30 0.8 1760 MW 3.1 29 In these shots, the reversals occur at higher density, during the density ramp phase, as the heating power increases.

Physics Operator Summaries

Entered: Feb 7 2012 07:43:40:030PM

Author: Jerry Hughes

PO run summary for 1120207 MP653b "Hidden variables in Neo-Alcator scaling" SL: D. Ernst PO: J. Hughes The machine ran fairly smoothly today. Recovery from boronization was not too painful, either from the point of view of startup or RF conditioning up. It took a couple of shots to get the pre-fill right, but from about shot 4 on, no changes were needed. The cryopump was used on all shots, without incident. It was very effective at keeping the density under control, once the walls were sufficiently outgassed. USN density control was excellent. It took several shots with RF (and some disruptions) to get the density down to the level desired by the SL. To access nl04~4e19 in LSN, it was also necessary to reduce the PG3 puff around t=0, as Steve Wolfe kindly pointed out. (I later raised this back when shot 28 ran away and disrupted.) I used all 4 segments today. The LSN shots we began the day with were running out of Segment 2. The USN shots we finished with ran out of Segment 4. Two locked mode claibration shots ran out of Segment 3. The only significant operational constraint we encountered was late in the run, when we began to put significant power at moderate density onto the upper dievertor. Anything more than about 2MW at nl04~8e19, and without a significant strike point sweep, reproducibly produced tungsten injections from the upper divertor probes. Dan Brunner confirmed that probes at both inner and outer strike points were heating up considerably. I put in a ~1cm strike point sweep beginning on shot 29, and the SL's power request was reduced, and the injections stopped. Scorecard: 1 Gas test 1 Fizzle 2 Ramp-up disruptions 4 Flat-top disruptions 24 Plasmas into rampdown

Session Leader Comments
Feb 7 2012 09:59:05:050AM	1120207004	Darin Ernst	Repeat shot C1 in Plan.
Feb 7 2012 10:11:55:130AM	1120207004	Darin Ernst	Good power ramp, D performing very well (after boronization!). J not as good in tail end of shot. Got H-mode around 600 kW. Try shortening the outer leg to stay out of H-Mode (known to change ohmic confinement). HIREX Sr. noisy: Increase Ar puff to 100ms from 40ms. (possibility of Helium fill issue, but try larger puff). Repeat shot C1 in plan.
Feb 7 2012 10:33:22:627AM	1120207005	Darin Ernst	Great shot. H-Mode delayed by shortening outer leg. H-modes will help with TS calibration. TS fixed next shot. HIREX still noisy with 100ms Ar puff, and need locked mode to see reversal. Can't get locked mode yet, need to lower density. Move on to show C2 in plan, with smooth RF ramp. Work on lowering density, to prepare for density ramp up, based on 1120106025. NEXT repeat shot C2, with lower density.
Feb 7 2012 10:59:43:520AM	1120207007	Darin Ernst	HIREX Sr. Vtor0 Z line ramping up from -35 km/s to 0 at H-mode transition. Density has dropped slightly to nl04=0.75, and increases to 1.0 by H-mode transition. NEXT: repeat C2 in plan.
Feb 7 2012 11:13:44:293AM	1120207008	Darin Ernst	HIREX Sr. Vtor0 Z line jumps at start of D RF. Try moving the J to D switchover to test this. Density unchanged from last shot. Add 50 ms maintenance puff of Ar at 0.9 sec NEXT: repeat C2 in plan.
Feb 7 2012 11:25:35:993AM	1120207009	Darin Ernst	Amanda suggests cross-calibrating FRCECE and Michaelson for final analysis. ECE Coverage is good. Density is identical the last three shots. Need to blast the walls. Going to full RF power for full flat-top duration to condition walls. Maintenance Ar puff helped, increase to 100ms, move to 1.0 sec. NEXT: condition walls to lower density
Feb 7 2012 11:40:33:993AM	1120207010	Darin Ernst	Had 2MW RF, got 4 elm-free H-Modes, terminated by injection. NEXT: Repeat shot C2 to check whether this lowered the density.
Feb 7 2012 11:52:35:440AM	1120207011	Darin Ernst	The high power conditioning worked...the density dropped to nel=0.6. Now we can try the locked mode shot 1120203022 for HIREX Sr. HIREX Sr. data quality has improved. No reversals or transitions seen, though density should have been very close to the LOC-SOC transition. NEXT: Shot B: Locked mode for HIREX SR.
Feb 7 2012 12:04:36:660PM	1120207012	Darin Ernst	Good locked mode. Completed shot B. May repeat at end of day. NEXT: full power RF shot to condition, while we wait for HIREX Sr. calib.
Feb 7 2012 12:18:11:717PM	1120207013	Darin Ernst	Good blaster shot. NEXT: repeat C2, see if density has lowered.
Feb 7 2012 12:20:05:393PM	1120207013	Darin Ernst	Good blaster shot. NEXT: another high power blaster shot.
Feb 7 2012 12:38:02:527PM	1120207014	Darin Ernst	Good. Density was lower again at nl04 = 0.5 before the RF. Move back to physics, blasting at the end of the shot. NEXT: C2, watch for reversals.
Feb 7 2012 12:52:23:220PM	1120207015	Darin Ernst	Great shot. Density was down to nl04=0.35. NINJA puff at 0.65s caused it to rise to 1.0. Saw Vtor swing counter during RF. Looks like we have the density just about low enough. Was the apparent reversal-like behavior due to the NINJA density ramp, or the RF? Moving RF earlier to 0.6 sec with same final power. NEXT: repeat C2, turning off NINJA.
Feb 7 2012 01:10:43:660PM	1120207016	Darin Ernst	Uh...RF and density move together. Saw reversal like stuff, but during a series of little H-modes that could. Try turning off NINJA and RF to check density control. NEXT: D1, with density ramp 0.6s to 1.2s up to nl04=1.0
Feb 7 2012 01:25:54:120PM	1120207017	Darin Ernst	Great shot: Got classic rotation reversal near expected density. Had Bt=5.5T for CECE -- they got data. Now add 0.5MW continous RF to check hypothesis that critical density has an inverse sqrt(P) dependence. NEXT: shot D3
Feb 7 2012 01:59:37:350PM	1120207019	Darin Ernst	Got an H-Mode at about the critical density for LOC-SOC. No way around this at the moment. Move on to Scan 2, RF power scan at low density, within a shot. May consider USN for this scan. Problem then is I-Mode like power scaling. No NINJA this shot. Changing ECE grating for the new field 5.5 T after next shot. NEXT: shot F1
Feb 7 2012 02:35:23:503PM	1120207021	Darin Ernst	locked mode shot Prepare for shot by shot density scan at constant Te/Ti. In the lowest density case shot 020 nl04=0.3, Zeff=3.5, Ti =1.75, Te=3.1 In the highest density cases, i.e. shot 005: nl04=1.0, Zeff=2.0, Ti = 1.5, Te=2.25 Need to get to higher powers and temperatures at higher densities without H-Mode, to match the Te from the low density cases. This will help us see reversals at higher density during power ramps also. NEXT: Low density ohmic, no RF, ninja at 1.0 sec MOVING TO USN CONFIG.
Feb 7 2012 02:40:34:127PM	1120207022	Darin Ernst	Good. NINJA puff at 1.0 sec ramps the density, see reversal near expected density. Very high Zeff before NINJA puff. Te=3.0, Ti=1.35. HIREX data very clean. NEXT: Same shot, but USN instead of LSN.
Feb 7 2012 03:27:00:940PM	1120207024	Darin Ernst	Good downward density ramp from nl04= 0.8 to 0.5. Saw Vtor reversal near expected density. Zeff=2.5 to 3.5. NEXT: RF power ramp into nl04=0.8 USN shot
Feb 7 2012 03:38:53:403PM	1120207025	Darin Ernst	Got to Te=2.6 before disruption. No TS. Good, repeat with RF up to 4 MW.
Feb 7 2012 04:24:19:473PM	1120207028	Darin Ernst	disrupted early. nl04=0.8 with 2.1 MW RF: Te was too high at 3.7 keV. Drop power to 1.76 MW to aim for 3.1 keV. Repeat.
Feb 7 2012 04:41:07:147PM	1120207029	Darin Ernst	good. got correct Te~3.1. NEXT: nl04=0.6, Prf=1.05 MW
Feb 7 2012 04:50:05:350PM	1120207030	Darin Ernst	Good. Got correct Te=3.1 before NINJA puff lowered it. Move to nl04=0.4, Prf=352 kW.
Feb 7 2012 05:01:48:550PM	1120207031	Darin Ernst	Good. Te was slightly low at 2.8 keV. But, toroidal rotation reversed at higher density, as if higher collisionality, at higher Te than the ohmic cases. NEXT: nel=0.5 with Prf=704 kW.
Feb 7 2012 05:20:09:597PM	1120207032	Darin Ernst	Great shot. Hit Te=3.0 keV. This last density and power scan kept Te constant while scanning density from nl04 = 0.3 - 0.8, and shows a consistent trend. The reversal density increases with heating power, and is pushed to higher densities at higher temperatures, qualitatively consistent with a collisionality dependence. END OF RUN

Physics Operator Comments
Feb 6 2012 05:43:56:823PM	1120207001	Jerry Hughes	Load from 1120118024. USN, 1MA, nl04 demand ~0.5e20 In seg2, reduce PG1 pulse (Ar) to 40ms. Reduce PG2 and PG3 to zero throughout seg2. Load at 6-Feb-2012 17:43:32.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Ready for tomorrow.
Feb 7 2012 09:04:10:783AM	1120207001	Jerry Hughes	Shot 1. Gas test Set PG3 pulse in Seg 1 to full on (100) Load at 7-Feb-2012 08:57:58.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: ok.
Feb 7 2012 09:18:12:320AM	1120207002	Jerry Hughes	Shot 2. Return PG3 program in Seg 1 to 30% back porch. Import Seg2 from 1120125001 into Seg2. Set Ip to -1000000 A Set nl04 to 1.0e20 Set PG1 (Ar) to 40ms at 0.3s Load at 7-Feb-2012 09:11:58.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Full length plasma. Holds target density without much puffing. H-mode readily triggered with RF.
Feb 7 2012 09:48:28:927AM	1120207003	Jerry Hughes	Shot 3. No PO changes. Result: Fizzle. Looks like fill pressure is too high and rising.
Feb 7 2012 09:57:12:207AM	1120207004	Jerry Hughes	Shot 4 Reduced PG4 pulse in Seg1 from 42 to 30ms. Change TF in seg2 to -147000 to give 5.3T for GPC coverage. Load at 7-Feb-2012 09:53:46.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done
Feb 7 2012 10:24:27:900AM	1120207005	Jerry Hughes	Shot 5. Move X-point to attempt to suppress H-mode: Increase RXL by 0.015m in Seg 2 Decrease ZXL by 0.010m in Seg2 Increase PG1 from 40ms to 100ms in Seg1 Load at 7-Feb-2012 10:13:41.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Plasma into rampdown. H-mode delayed to 1.3s.
Feb 7 2012 10:40:57:567AM	1120207006	Jerry Hughes	Shot 6 Reduce nl04 in seg2 to 0.4e20 Reduce 2nd PG3 pulse in seg2 from 30 to 20. Load at 7-Feb-2012 10:29:57.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Plasma into rampdown. Density shows signs of dropping prior to RF onset.
Feb 7 2012 10:59:06:590AM	1120207007	Jerry Hughes	Shot 7 No PO changes result: Plasma into rampdown. H-mode at 1.27s.
Feb 7 2012 11:04:30:943AM	1120207008	Jerry Hughes	Shot 8 No PO changes Result: Plasma into rampdown. H-mode at 1.45s
Feb 7 2012 11:10:29:450AM	1120207009	Jerry Hughes	Shot 9 Adding an Ar "maintenance puff". 50ms at 100V on PG1, starting at 0.9s in Seg2 Load at 7-Feb-2012 11:10:16.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done
Feb 7 2012 11:37:31:897AM	1120207010	Jerry Hughes	Shot 10. Changes: Begin TF rampdown at 1.5s rather than 1.6s, at Hubbard's request. Change 2nd Ar puff. PG1 at 100 for 100ms starting at 1s. Load at 7-Feb-2012 11:27:15.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done RF going in at higher power levels throughout flattop. Result: 3 ELM-free H-modes. High radiation event and disruption at 0.95. Matt says it's copper.
Feb 7 2012 01:14:49:550PM	1120207011	Jerry Hughes	Shot 11. RF will go back to ramping power. No PO changes. Result: Plasma into rampdown. L-mode density is reduced from previous shots, presumably as a result of the disruption on shot 10.
Feb 7 2012 12:04:21:900PM	1120207012	Jerry Hughes	Shot 12 Locked mode attempt. Import seg3 from 1120203022 into seg3. Turn off seg2 Turn on Seg3 Set PG5 in Seg3 to 0. Set PG2 in Seg3 to 0. Leave PG1 (Ar) as is. Load at 7-Feb-2012 11:56:53.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Plasma into rampdown. nl04 drops to 3.4e20 after locking. Matt would like more signal for Hirex on next locked mode shot. So before switching back to Seg2, set PG1 to 100V from 30V in Seg3.
Feb 7 2012 12:21:22:540PM	1120207013	Jerry Hughes	Shot 13 Turn off Seg3 Turn on Seg2 Set Ip to -1000000 A by 0.5 s, rather than 0.6s. Load at 7-Feb-2012 12:08:58.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Plasma into rampdown. A number of H-modes. Similar to shot 10, but no killer injection.
Feb 7 2012 12:37:02:313PM	1120207014	Jerry Hughes	Shot 14. Adjust nl04 program at .4s. Also, reduce PG3 backporch around t=0 from 30 to 20, per smw's suggestion. Load at 7-Feb-2012 12:25:43.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Plasma into rampdown. Early density is lower.
Feb 7 2012 12:50:10:990PM	1120207015	Jerry Hughes	Shot 15 Reduce nl04 demand to 3e19. Also reduce PG3 Vs in seg2. Load at 7-Feb-2012 12:40:45.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Plasma into rampdown. In Ohmic phase, nl04 gets down to 3.5e20. NINJA puff causes this to rise to 7e19 before RF turn on. H-mode at 1.35s.
Feb 7 2012 01:08:16:730PM	1120207016	Jerry Hughes	Shot 16. No PO changes. Result: Plasma into rampdown. RF induced nl04 rise, follwed by multiple H-modes.
Feb 7 2012 01:26:31:887PM	1120207017	Jerry Hughes	Shot 17. Set TF in seg2 to -153000 A. Set nl04 to ramp from 3e19 to 1e20 over 0.6--1.2s. Load at 7-Feb-2012 13:10:33.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Plasma into rampdown. Ohmic only. Nice density ramp, with rotation reversal.
Feb 7 2012 01:34:00:980PM	1120207018	Jerry Hughes	Shot 18 Increase nl04 demand at end of ramp (1.2s) to 1.2e20. Load at 7-Feb-2012 13:25:33.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done result: Disruption at 0.32s, following a big Moly blast
Feb 7 2012 01:53:40:500PM	1120207019	Jerry Hughes	Shot 19. No changes. Try to recover from disruption. Result: Plasma into rampdown. Good density ramp starting from nl04~4e19. H-mode triggered when density rises above the low density limit (nl04~7e19). RF does not appear to be fueling excessively.
Feb 7 2012 01:56:09:740PM	1120207020	Jerry Hughes	Shot 20 Try flat density with RF variation. Reset nl04 demand to 3e19 in seg2. Load at 7-Feb-2012 13:55:47.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done
Feb 7 2012 02:15:40:293PM	1120207021	Jerry Hughes	Shot 21 Re run locked mode shot. Turn off seg2. Turn on seg3. Load at 7-Feb-2012 14:10:58.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Locked. Disrupted at 1.3s.
Feb 7 2012 02:40:00:370PM	1120207022	Jerry Hughes	Shot 22. Go back to shot 20 program. No RF this time. Turn off Seg3 Turn on Seg2 Load at 7-Feb-2012 14:21:24.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Plasma into rampdown. Nice low density until NINJA puff at ~1s.
Feb 7 2012 02:53:07:303PM	1120207023	Jerry Hughes	Shot 23 Go to USN. Import Seg2 of 1120118024 into Seg4 Zero out PG2,PG3. Apply PG1 pulses of 100ms at 0.3s and at 1.0s, just as in Seg2. Set TF to -153000 A, as in Seg2. Set nl04 to 3e19. Turn off Seg2 Turn on Seg4 Load at 7-Feb-2012 14:38:47.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Good full length shot. nl04 gets down to ~2e19 quite easily.
Feb 7 2012 03:22:16:587PM	1120207024	Jerry Hughes	Shot 24 Changes: Begin Ip rampdown at 1.5s. Bring nl04 up to 8e19 at 0.6s, then drop to 0 at 1s. Load at 7-Feb-2012 15:10:00.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Plasma, just into rampdown. Density ramps down slowly after 1s, giving a gentle rotation reversal, according to SL.
Feb 7 2012 03:37:26:110PM	1120207025	Jerry Hughes	Shot 25. SL wants constant density now. Set nl04 in Seg4 to 8e19 until 1.5s Load at 7-Feb-2012 15:24:32.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Plasma to 1.3s. Super flat density in flattop. I'm sure Matt will tell us what the injection was.
Feb 7 2012 03:47:35:833PM	1120207026	Jerry Hughes	Shot 26 No PO changes. Result: Early disruption
Feb 7 2012 04:02:50:833PM	1120207027	Jerry Hughes	Shot 27 Change: Increase PG3 backporch between 0 and 0.1s from 20 to 30. Load at 7-Feb-2012 15:50:35.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Disrupts at 1.3s. Matt says it's definitely W this time. We are cooking upper divertor probes.
Feb 7 2012 04:17:31:550PM	1120207028	Jerry Hughes	Shot 28 Change: Put some +/-2mm waggles in the RXU controller in Seg4. Load at 7-Feb-2012 16:11:53.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Disruption at 1.21s.
Feb 7 2012 04:36:22:687PM	1120207029	Jerry Hughes	Shot 29. SL wants reduced power at same density. Changes: Put in ~1cm ZXU sweep to try to spread the heat. Load at 7-Feb-2012 16:25:17.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Plasma into rampdown! Probes don't seem to be getting as hot at this power level, and with sweeping
Feb 7 2012 04:43:00:817PM	1120207030	Jerry Hughes	Shot 30 Change: nl04 to 6e19 Load at 7-Feb-2012 16:39:41.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Plasma into rampdown
Feb 7 2012 04:50:03:940PM	1120207031	Jerry Hughes	Shot 31 Changes: Decrease nl04 demand in Seg4 to 4e19. Load at 7-Feb-2012 16:48:14.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done
Feb 7 2012 05:14:37:437PM	1120207032	Jerry Hughes	Shot 32 Change: nl04 to 0.5e19 in Seg4. Load at 7-Feb-2012 16:58:39.00 Open tree /home/jwhughes/physop/pcs_scratch -1 Open tree done Result: Makes it into rampdown. EOR

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:00:29:050AM	Test	Ok	Gas Test
2	09:12:56:967AM	Plasma	Ok
3	09:38:39:433AM	Plasma	Ok
4	09:57:32:763AM	Plasma	Ok
5	10:15:14:327AM	Plasma	Ok
6	10:30:55:930AM	Plasma	Ok
7	10:43:44:983AM	Plasma	Ok
8	10:57:36:740AM	Plasma	Ok
9	11:13:08:677AM	Plasma	Ok
10	11:28:09:160AM	Plasma	Ok
11	11:41:39:033AM	Plasma	Ok
12	11:58:03:480AM	Plasma	Ok
13	12:12:29:543PM	Plasma	Ok
14	12:26:43:653PM	Plasma	Ok
15	12:41:23:807PM	Plasma	Ok
16	12:53:56:893PM	Plasma	Ok
17	01:11:13:327PM	Plasma	Ok
18	01:26:18:623PM	Plasma	Ok
19	01:38:40:630PM	Plasma	Ok
20	01:56:30:043PM	Plasma	Ok
21	02:11:57:830PM	Plasma	Ok
22	02:27:34:007PM	Plasma	Ok
23	02:45:02:457PM	Plasma	Ok
24	03:16:01:430PM	Plasma	Ok
25	03:28:41:330PM	Plasma	Ok
26	03:41:56:647PM	Plasma	Ok
27	03:57:10:763PM	Plasma	Ok
28	04:12:38:340PM	Plasma	Ok
29	04:26:48:130PM	Plasma	Ok
30	04:40:10:903PM	Plasma	Ok
31	04:53:25:103PM	Plasma	Ok
32	05:05:49:697PM	Plasma	Ok

System Availability

Feb 7 2012 09:00:09:857AM

System Available Comment Availability Changed Owner Description Who Can Change Active MHD no secured - tagged out Jun 02 2008 11:03AM (sears) Joe Snipes Active MHD Antenna golfit BES yes BES system is online Nov 22 2011 02:21PM (bespam) Bill Rowan Beam Emission Spectroscopy bespam,liao,rowan Bolometers yes Midplane and LEDGE-AX diodes functioning properly. Midplane bolometers working and calibrated. LEDGE/DIV bolometers working, but toaster calibration not yet complete. Jan 23 2012 12:02PM (mlreinke) Matt Reinke Bolometers hutch,mlreinke Boronization no Bottle Removed. System has been tested and will be ready once bottle is installed Jan 09 2012 06:32AM (dekow) Jim Irby Boronization dekow,irby CECE no   Jan 06 2012 03:48PM  Anne White Correlation ECE whitea CNPA yes Multiple channel CNPA available, no safety risk for in-vessel access Apr 14 2011 12:01PM (parker) Ron Parker Compact Neutral Analyzer parker Cryopump - Upper Divertor yes Operational. He level meter not working on 500L dewar. Frank will take manual readings. Jan 11 2012 11:46AM (labombard) Brian LaBombard Upper Divertor Cryopump dekow,irby,labombard CXRS yes core-CXRS system is online Nov 22 2011 02:21PM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,liao,rachmcd,rowan CXRS edge yes Michael CHurchill has primary responsibility at the moment Apr 19 2011 11:44AM (blip) Bruce Lipshultz Measurement of CXR light in the pedestal region at both the high- and low-field sides blip,rmchurch D Alpha yes \ha2_bright is available; \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 is not available Jul 01 2009 09:45AM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe Dalsa no system is is installed and aligned, but not functional (appears to be a broken cable) Dec 05 2011 02:41PM (marmar) Earl Marmar Visible Bremsstrahlung Imaging marmar Disruption Mitigation no gas jet valve disabled on 2011/04/13 Apr 13 2011 02:04PM (granetz) Robert Granetz Gas Jet granetz,whyte Divertor IR no   Mar 06 2007 10:50AM  Glen Wurden Divertor IR Digital Video gwurden,terry Divertor IR Spectroscopy no   Mar 06 2007 10:51AM  Glen Wurden Divertor IR Spectroscopy gwurden,terry DMBolo AXUV diodes yes Diodes are taking usable data. Not all post-processing code is working yet. Feb 01 2012 01:24PM (golynyk) Geoff Olynyk Set of six AXUV diodes in a toroidal array of midplane wall boxes. golynyk,granetz,mlreinke,whyte DNB yes   Dec 01 2011 11:46AM (granetz) Robert Granetz Diagnostic Neutral Beam dterry,granetz,mochung ECDC yes Operational as of 11/19/11 Nov 22 2011 03:01PM (irby) Jim Irby 2.45 GHz, 3 kW, discharge cleaning system dekow,irby,pfeiffer FRC-ECE no Power off to RF and IF sections- Power on to DA Apr 11 2011 02:54PM (phillips) Perry Phillips Heterodyne ECE-32 channels bespam,liao,phillips,rowan,whitea FTCI no   Jan 06 2012 04:36PM  Jim Irby Fast two-color interferometer irby G-Side Ratiomatic yes   Dec 02 2011 12:24PM (toland) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland Glow Discharge no Power supply unplugged and redtagged, HV cables removed Apr 14 2011 08:03AM (dekow) Jim Irby 1 kV, 5 A, glow discharge system dekow,dterry,irby GPC yes Using new preamps. Nov 30 2011 07:51AM (hubbard) Amanda Hubbard ECE Polychromater hubbard GPC2 yes Dewar cold. Nov 21 2011 09:55AM (hubbard) Amanda Hubbard ECE Polychromater hubbard GPI yes The Xpt-view, the midplane-view cameras are operational. The innerwall GPI (coupled to the fast-diodes) is available. Jul 01 2009 09:45AM (terry) Jim Terry Gas Puff Imaging terry,zweben H/D yes system is functional and taking data Dec 05 2011 02:42PM (marmar) Earl Marmar H/D Ratio marmar HEAT yes   Jan 09 2012 06:32AM (dekow) Gary Dekow - Machine Heaters - burke,dekow Hirex Jr yes Hirex-Jr has been installed Jun 28 2010 03:36PM (rice) John Rice High Resolution X-Ray ince,rice Hirex Sr yes Installed and aligned. Will be available for Ti/Vr profiles after focusing tests and locked modes are taken. Dec 06 2011 08:21AM (ypodpaly) John Rice High Resolution X-Ray cgao,ldelgado,rice,ypodpaly HXR yes 32 Channels operational,, no safety risk for in-vessel access Apr 14 2011 12:05PM (parker) Ron Parker Hard X-Ray Array faust,parker,schmidt ICRF D-Antenna no secured Apr 14 2011 08:55AM (wukitch) Steve Wukitch D-port antenna wukitch,ylin ICRF E-Antenna no secured Apr 14 2011 08:55AM (wukitch) Steve Wukitch E-port antenna wukitch,ylin ICRF J-Antenna no secured Apr 14 2011 08:56AM (wukitch) Steve Wukitch J-port antenna wukitch,ylin Impurity Spectroscopy yes Being upgraded with better optics and new spectrographs. Dan Miller has primary responsibility. Apr 19 2011 11:46AM (blip) Bruce Lipshultz Measurement of recycling light and impurity source rates at multiple surfaces around the tokamak blip,miller Laser Blow-Off yes Operational and tested Jan 06 2012 03:50PM (g) Martin Greenwald Impurity Injection System g,nthoward Lower Hybrid no LH HV Breaker Opened and Tagged, TPS Upgrade Underway Nov 10 2011 03:51PM (dterry) Ron Parker Lower Hybrid dterry,parker,wallaceg Lower Hybrid Reflectometer no off Apr 15 2011 08:24AM (dominguez) Arturo Dominguez Lower Hybrid Reflectometer dominguez,marmar,parker,sgbaek LoWEUS yes LoWEUS viewing the 10-30 nm region, spectral brightness vs. lambda and time are being stored in tree. Jan 23 2012 12:03PM (mlreinke) Matthew L. Reinke Long Wavelength Extreme Ultraviolet Spectrometer markchil,mlreinke LPI no Beam line removed May 30 2008 02:09PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar Ly-alpha yes Midplane Lyman-a and LEDGE-LY working normally. New B-PORT Lyman (BPLY) still being debugged. Jan 23 2012 12:04PM (mlreinke) Matt Reinke Lyman alpha cameras faustian,labombard,mlreinke Magnetics yes   Dec 01 2011 11:51AM (g) Robert Granetz Bp coils and flux loops for equilibrium control granetz,wolfe McPherson no **vacuum system problem*** McPherson viewing the 10-14 nm region for molybdenum monitoring. It's days are numbered as LoWEUS has demonstrated superiority. Jan 31 2012 08:15AM (mlreinke) Jim Terry VUV Spectrometer markchil,mlreinke,terry Michelson yes Front end at 4.5e-8 T. Reduced speed for initial operation. Nov 30 2011 07:51AM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt MKS yes   Dec 02 2011 12:27PM (toland) Brian LaBombard Baratron pressure gauges labombard,toland MLP no System is in edge lab. Version 2 drivers ready to test. Needs a student to help work on it. Jul 14 2009 09:20PM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard MSE no 1/3/2011: push-pull mechanism broken. MSE inoperative Jan 03 2012 11:47AM (sscott) Steve Scott Motional Stark Effect jinseok,sscott Neutrons yes High voltage is on. We're ready for plasma. Nov 21 2011 12:58PM (fiore) Catherine Fiore Neutron Detectors fiore Neuts and Hards yes All detectors Powered On --- Waiting for neutrons for calibration Nov 22 2011 01:05PM (irby) Jim Irby X-Ray/Neutron Detectors at K-Hor irby NINJA yes C-bottom and new F-bottom system ready. Dec 02 2011 12:28PM (toland) Brian LaBombard NINJA gas puff labombard,terry,toland PCI yes Operational. Nov 30 2011 12:45PM (ntsujii) Miklos Porkolab Phase Contrast Imaging emd,ennever,ntsujii,porkolab Penning Gauges yes Operational. High voltage comes on during INIT and off at RECOOL. Dec 09 2011 09:48AM (labombard) Brian LaBombard Penning Ionization Gauges labombard Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational. Jul 01 2009 09:46AM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe Polarimeter yes 3 chords operational but with high noise level Jan 06 2012 04:22PM (irby) Jim Irby C-Mod Polarimeter irby Power - Alternator Air Switch yes   Jan 09 2012 06:33AM (dekow) Gary Dekow feeds all the other supplies cochran,dekow,dterry,irby Power - PEI yes   Jan 09 2012 06:33AM (dekow) Gary Dekow PEI System cochran,dekow,dterry,irby Power - TMX yes   Jan 09 2012 06:33AM (dekow) Gary Dekow Ef2s,. EFCs and A-Coils byford,cochran,dekow,dterry,irby Power Systems yes   Jan 09 2012 06:33AM (dekow) Jim Irby C-Mod Magnet Supplies byford,cochran,dekow,dterry,irby Probe Array - ISD yes Operational, except for probe #1 (open circuit) and probe #16 (not installed). Dec 09 2011 09:50AM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard Probe Array - LH yes Operational, except for bottom-D probe (open circuit). Dec 09 2011 09:52AM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard Probe Array - OSD yes F-divertor ok. J-divertor ok, except for JDIV_06 which is shorted out. Dec 09 2011 09:54AM (labombard) Brian LaBombard Outer Lower Divertor Probe Array (F and J) labombard Probe Array - UDIV yes Operational except for probes #4, 5 and 13 (open) Dec 09 2011 09:56AM (labombard) Brian LaBombard Upper Divertor Probe Array labombard Reflectometer yes As of 1120105xxx, all channels are connected Jan 05 2012 09:14AM (dominguez) Earl Marmar Reflectometer dominguez,marmar Scanning Probe - ASP yes Ion Sensitive Probe head installed. Testing in piggy-back mode. Dec 20 2011 12:33PM (labombard) Brian LaBombard A-Port Scanning Probe labombard Scanning Probe - FSP yes Operational. Dec 09 2011 09:57AM (labombard) Brian LaBombard F-Port Scanning Probe labombard Scanning Probe - WASP yes A-port WASP is operational. K-port WASP is dead (all probes melted together). Dec 09 2011 09:58AM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick Shoelace Antenna yes Fixed frequency operation available (100kHz) at moderate power (< 0.5kW). Otherwise in receiver mode. Jan 11 2012 11:50AM (labombard) Brian LaBombard High-k active MHD antenna, for QCM, WCM studies golfit,labombard SOL reflectometer yes c-port waveguides operational, h-port waveguides are not. Nov 29 2011 12:04PM (cornwall) Cornwall Lau SOL reflectometer cornwall,wukitch,ylin Sparker yes New Type II sparker replaced Type I on 11/17/2011 Nov 23 2011 08:53AM (irby) Jim Irby Field Emission Preionization for C-Mod dekow,irby,parkin Surface Science Station no SSS is up to air, no safety issues Apr 14 2011 12:06PM (ochoukov) Bruce Lipschultz Radially scanning probe located on K-port blip,ochoukov TCI yes TCI Operational. Density feedback operational. Nov 10 2011 11:47AM (irby) Jim Irby Two-Color Interferometer irby,murray TS - Core yes Operating with two 50Hz lasers, precise density calibration still required. Feb 03 2012 04:04AM (jwhughes) Jerry Hughes Core Thomson scattering jrwalk,jwhughes,yma TS - Edge yes System taking data. Requires calibration. Feb 03 2012 04:05AM (jwhughes) Jerry Hughes Millimeter resolution edge Thomson scattering jrwalk,jwhughes,yma Vispec no 350 and 670 nm, 4 spatial channels Nov 28 2007 09:58AM (agraf) Alex Graf Visible Spectrometer agraf XEUS yes XEUS viewing the 1-6 nm region, spectral brightness vs. lambda and time are being stored in tree. Jan 23 2012 12:13PM (mlreinke) Matt Reinke X-ray Extended Ultraviolet Spectrometer markchil,mlreinke XTOMO yes ARRAY1->4 working normally, ARRAY5 (new core view) working but spatial calibration issues not yet resolved Jan 23 2012 12:13PM (mlreinke) Robert Granetz X-Ray Tomography faustian,granetz,mlreinke

Feb 7 2012 09:57:43:407AM

Density control is fine at nl04=1.0. RF coming up fast. Continue conditioning, harping on shot C1 in the plan. no DNB today LH reflectometer not working D2 NINJA at 0.6, 0.8 sec He GPI 0.5 - 1.0 sec PCI 0.4 - 1.6 sec HIREXSr 20ms sampling 40 ms Ar puff (not digitizing correctly?) Lower TF from 5.4T to 5.3T to improve ECE axis coverage Need to check HIREX Sr. data quality 112 GHz reflectometer channel around 80 cm at this density NEXT: Shot C1 in plan (continue RF conditioning with physics setup)