Miniproposals

Miniproposal: 653b Date Filed: 1/12/2012 Title: Hidden variables in Neo-Alcator scaling First Author: Darin Ernst Session Leader: Darin Ernst (shots 1-27)

Engineering Operator Run Comment

MP653B Hidden Variables in Neo-Alcator Scaling Day #2 SL D. Ernst PO S.

Session Leader Plans

Entered: Jul 18 2012 01:57:17:833AM

Author: Darin Ernst

MP653B Hidden Variables in Neo-Alcator Scaling Day #2 The goal of this experiment is to decouple hidden variables Te/Ti and collisionality from density, to understand the mechanism for the density scaling of confinement in the neo-Alcator regime. Density does not appear in the dimensionless delta-f gyrokinetic Maxwell equations, so it should not affect core confinement directly, except through collisionality. Likely parameters would be Te/Ti, Zeff, and collisionality, as well as R/Ln, all of which co-vary strongly with density. We will use density scans, power scans at constant density, and density scans at constant Te/Ti to unravel this dependence. Complete fluctuation data will be taken and compared with gyrokinetic simulations. This work supports the JRT 2012. ===== Conditions: Boronization is two nights prior this time, so we should be able to get to low densities. We have asked for ECDC. 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. 5.4 T, 1.0 MA, Cryopump, USN similar to 1120207032 Ip flat top: 0.5 to 1.6 sec We expect to have trouble with runaways and locked modes at the lowest densities, and also with impurities during RF. However, Day 1 was successful in attaining very low densities without RF. We will monitor x-rays and ECE for evidence of runaways. ===== Diagnostics: HIREX Sr: Plan for B-side lower puff 40-100ms Ar., 20ms sampling. Last time (1120207) we had a 100ms puff early, followed by a 100ms maintenance puff at 1.0 sec. We will need to take 3-4 calibration shots for HIREX Sr. H-line view focusing. We will also need a locked mode at the beginning of the day, and one toward the end of the day. Probably we have to be able to get to low densities to get the locked modes. (Reinke/Rice/Gao) Locked mode setup shot: 1120207012 We do not have the DNB today: no MSE, core CXRS, edge CXRS Er. GPI is set up for D2 puffs instead of He. (Jim Terry) PCI will not use the mask, to avoid having an uncharacterized difference in the calibration, since we want to make quantitative comparisons with GS2/GYRO.(Tsujii/Ennever) We may follow up with the mask in piggyback on a USN L-Mode with heating. Reflectometry has 60/75/88low/88upper/112/140 GHz channels available, but one of the Gunn diodes of the sweeping channel is dead, so correlation measurements will not be available. (Seung-Gyou Baek) Edge CXRS will be available. (Michael Churchill) CECE will be available at 5.4 T. (Choongki Sung) ECE: GPC2 set up with a grating good to 6.3 T. Late Friday changed GPC back to an angle good for 5.4 T (plasma was down to 5.5 anyway) so Frank should not need to make that change after all. If we run any 5.4 T... He will turn on ECE as usual, and should let session leaders know if there are problems. Michelson available all fields. FRCECE avaialable at 5.4 T. (Amanda Hubbard) Upper Divertor Probes: WARNING - USN operation with >2 MW 1120207: 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. (Jerry Hughes comments) ===== Plan: Step 1 Establish operation, calibration shots for HIREX Sr. Establish USN operation at 5.4 T, 1.0 MA, elongation ~ 1.6, nl04 = 1.0, ohmic heating. Add 100 ms B-side lower Ar puff for HIREX Sr. Check HIREX Sr. data quality. Add 100 ms maintenance puff at 1.0 sec Increase Ar puff to as much as 100 ms if needed (USN will pump out more Ar). Similar to 1120207032. Provide 3 calibration shots for HIREX Sr., Add RF at end of flat-top with timing in consultation with HIREX Sr. Step 2 Lower density Lower density to nl04 = 0.3, then 0.2, and observe temperatures. RF condition if needed. Te/Ti at this density will be the target Te/Ti for the scan. Locked modes may occur and will be used for HIREXSr calibration. (2-4 shots) Step 3 Locked mode shot Take locked mode shot 1120207012 when nl04 < 0.5 Step 4 Ohmic density scan Complete Scan 3 in MP653b: scan density nl04 = 0.3, 0.4, 0.6, 0.8, 1.0 without RF power. (5 shots) Step 5 Upward density ramp with GPI Ramp density to observe LOC-SOC transition via rotation reversal. Start at nl04 = 0.5 and ramp to 1.0 via NINJA puff for GPI. Document rotation reversal density. Step 6 RF power ramp at LOC-SOC density Ramp RF power 0 to 4 MW (J+D+E) at fixed density nl04 = 0.7 or the LOC-SOC density. Use Strike point sweep to keep power off probes. Observe RF power P* required to match Te from nl04 = 0.3. Linearly interpolate between nl04=0.3 and nl04=0.7 to find Te vs. RF power. Since tauE is proportional to density, and roughly, Poh ~ 1 MW, (Prf+Poh)*tauE ~ n*(Te+Ti), we have an offset linear relationship between Te and Prf within the neo-Alcator regime, and perhaps beyond. Step 7 Match temperatures at low and high densities Run with steady nl04=0.7 (or the LOC-SOC density) and Prf=P*. Confirm temperature match to nl04=0.3 case. Tweak power and repeat if needed. Step 8 Density scan at constant Te/Ti Linearly interpolate to obtain revised slope of Te(Prf) from Step 7 matching. Use this relation to ramp RF power with density to maintain constant Te/Ti or constant Te. Scan density from nl04 = 0.4, 0.5, 0.6, 0.7, 0.8, 1.0 and increase power with density to match Te for nl04 = 0.3. Step 9 Power scan at constant density in SOC With nl04=1.0, ramp RF power from 0 to 4 MW from 0.5 to 1.5 sec. Look for rotation reversal. If found, zero in with smaller RF power ramp. Repeat at nl04=0.8 if time permits. Step 10 Locked mode shot Take locked mode shot 1120207012

Physics Operators Plans

Entered: Jul 18 2012 07:47:10:967AM

Author: Syunichi Shiraiwa

PO plan for 07/18/12 SL D. Ernst PO S. Shiraiwa ----------------- Engineering Setup ----------------- Run begins at 09:00 and ends at 17:00 Power systems as on: 1120207032 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/LoWEUS Leave z-bolo shutter as is (should be open) Torvac gatevalve toggle (yes/no): no Boronization(yes/no): no Overnight ECDC (yes/no): yes ICRF(yes/no): yes LH(yes/no): no Cryopump (yes/no): yes DNB (yes/no): no Vessel temperature: 35/35/35 ------------------------------ ECDC Parameters (if requested) ------------------------------ gas and pressure: D2 at 2e-4 Torr sweep: 44/45/103 cm scan: 20/120 s Extended until 8AM

Session Leader Summaries

Entered: Jul 20 2012 11:00:12:363AM

Author: Darin Ernst

Operations delayed by alternator check, then DPCS software bug created this morning, until 10 am. Then we had a request from the HIREX group for 3-4 alignment shots (we took 5). The run begin in earnest at 11:40 AM. The machine ran cleanly, with very few impurity injections. RF was nearly flawless. We had a full suite of fluctuation measurements, including CECE, GPI with D2, PCI, Reflectometry (in core as well as edge), fast TCI, mirnovs, polarimetry (until 4pm). PCI did not use the mask. HIREX Sr. was working well and with good signal, and we had several locked modes. There was no DNB, so we had no MSE. TS was calibrated over the past weekend. We had a boronization two nights prior. This seemed to work out better than the night before. We did have some trouble with locked modes at low densities, which seemed to be caused by density oscillations during ramp-up. The cyro was on and we were running USN. The density oscillations were large during and following the initial puff. This may have been the result of the pumpout being slower than on 1120207, which had the same setup, but did not suffer the large density oscillations. When ramping down to lower densities nl04 < 0.6 or so, the DPCS did not puff, so we effectively were relying exclusively on pumpout. The oscillations may have been due to the way the plasma moved off the inner wall as it expanded to move the X-point toward the upper cyro (MLR theory). We obtained 13 useful discharges. - Filled in points in the ohmic density scan from nl04=0.25 to 1.0. - Ramped RF power at nl04=0.8 from 0.5 to 4 MW, reaching Te0 of 4.1 keV, with a possible I-Mode at the high end of this range. - Ramped density to find rotation reversal at LOC-SOC transition nl04=0.62. - Ramped RF power with density to maintain const sawtooth averaged Te0 ~ 3.1 keV for nl04 = 0.55, 0.70, 0.96, 1.0. (This temperature was a little high. We should have aimed for 2.3 keV, and we could not get to low enough density with RF, so we need more points at lower density.) - Runaways were excessive for nl04<0.35. - This left a density window of interest between runaways and LOC-SOC of nl04 = 0.35 to 0.62. - The scans from today overlay the scans from 1120207 nicely, giving a more complete set of data. The figure shows the scans completed so far. The yellow areas in the figure show where more points would be useful. Thank you all for your excellent help in this run. The yellow areas below could use some additional filling in. STEP 1 HIREX cal. shots: nl04=1.0, NINJA for CXRS, RF cond. at 1.3 sec, Bt=5.44T, Ip=1.0 MA 01 test shot *02 good, but no Argon *03 good, with Argon *04 good, with Argon *05 good, with Argon *06 good, with Argon Up to this point, HIREX group could not get H-line focused. HIREX group reports they finally got the H-line focused on shot 07. Physics run began 11:40 AM. STEP 2 Lower Density *07 ohmic, wanted nl04 = 0.3, got 0.6 STEP 1 Locked modes for HIREX 08 locked mode for hirex 1120207012, but not enough Argon 09 repeat locked mode for hirex with more Argon, good. STEP 2 Lower density 10 ohmic, wanted nl04=0.3, disrupted 1.0 sec 11 ohmic, wanted nl04=0.3, got 0.25 with massive runaways 12 ohmic, wanted nl04=0.4, got locked mode 0.35 sec 13 ohmic, wanted nl04=0.4, similar, disrupted 0.6 sec *14 ohmic, wanted nl04=0.5, good. 15 ohmic, wanted nl04=0.4, got locked mode STEP 5 Ohmic density ramps *16 ohmic density rampdown nl04 = 0.6 to 0.3 over 1 sec., good. Got down to 0.45, oscillates around request. *17 repeat. Good. Ctr-Co rotation reversal at 0.79 sec (nl04=0.62). Ninja puff stopped density fall at 1.2. Successful ramp from nl04=0.8 to 0.47. STEP 4 Ohmic density scan (get to low density via rampdown, aim for steady 1.0 - 1.5 sec) *18 good. nl04=0.3 to 0.25 from 1.0 to 1.5 sec. Te0= 3.5 keV at nl04=0.3 and 4.0 keV at nl04=0.25. *19 good. nl04=0.30 to 0.35 from 1.0 to 1.5 sec. 20 runaway shutdown *21 good. nl04=0.34 to 0.40 from 1.0 to 1.5 sec. STEP 6 RF power ramp at nl04=0.8 *22 good. Ramp RF power starting 0.8 sec, going to 4MW by 1.5 sec. nl04 = 0.8. Reversal at 0.84 sec. To reach Te0 = 4.0 keV took 3.4 MW. Hitting the 2.6 keV for GPC Ch9 at inversion radius took 4.0 MW. STEP 7 Match temperatures at low and high densities *23 nl04=0.76 before 4 MW RF, then 1.1 during RF (poss. I-Mode) *24 nl04=0.76 before 3 MW RF, then 0.9 during RF *25 wanted nl04 = 0.5, Prf = 1.2 MW, got 0.7, then 0.9 during RF *26 want nl04=0.5, got nl04=0.69, ramp RF power 0.9 MW to 1.5 MW from 0.5 to 1.5 sec. good. *27 want nl04=0.55, got nl04=0.55, ramp RF power 1.0 to 1.4 MW from 1.0 to 1.5 sec. good.

Physics Operator Summaries

Entered: Jul 18 2012 05:23:05:283PM

Author: Syunichi Shiraiwa

Session Leader Comments
Jul 18 2012 04:04:01:843PM		Darin Ernst	Begin STEP 7 PLAN: constant density nl04=0.8, constant RF power 1.0 - 1.5 sec 4.0 MW OUTCOME:
Jul 20 2012 04:06:31:753PM		Darin Ernst	reproduce 1120207032 - nl04=0.5 with 700 kW
Jul 18 2012 10:11:58:843AM	1120718001	Darin Ernst	Plan: three cal. shots for HIREX Sr., nl04=1.0, NINJA for CXRS, RF cond. at 1.3 sec, Bt=5.44T, Ip=1.0 MA Outcome: no Argon that shot, but nice, with 3.5MW clean RF 1.3-1.5, got H-Mode. Delays due to Alternator: 35 min, then PCS programming bug due to morning change (30 min).
Jul 18 2012 10:23:11:310AM	1120718002	Darin Ernst	PLAN: repeat with Ar. OUTCOME: good, HIREX group says ok.
Jul 18 2012 10:24:12:330AM	1120718004	Darin Ernst	PLAN: repeat. Have one shot so far for HIREX, need two more. OUTCOME:
Jul 18 2012 10:58:06:770AM	1120718004	Darin Ernst	PLAN: repeat. Have one shot so far for HIREX, need two more. OUTCOME: good, but had impurity injections at 0.5, 0.6, and 1.13 sec Sawteeth 2.25 - 3.5 keV with 2.25 MW RF. ST period 13.6 ms. Inversion radius between GPC2 ch. 9 (77.6 cm) and ch. 10 (76.0 cm) ~ 76.8 cm or rmid/a ~ 0.44
Jul 18 2012 11:01:20:860AM	1120718005	Darin Ernst	PLAN: repeat. Have one shot so far for HIREX, need two more. Moving view to look for H-line. OUTCOME: good.
Jul 18 2012 11:01:02:163AM	1120718006	Darin Ernst	PLAN: repeat, last shot for HIREX. OUTCOME:
Jul 18 2012 11:41:58:223AM	1120718006	Darin Ernst	PLAN: repeat for HIREX Sr. OUTCOME: good. very nice 2.5 MW RF. HIREX cannot see H line, but they say He line always agrees anyway with H line Ti. (?) Matt says can get instrumental temperature from Mb line, so we are ok. Only need one locked mode today, early in day. STEP 1 COMPLETE, MOVE TO STEP 2
Jul 18 2012 11:40:13:750AM	1120718007	Darin Ernst	BEGIN STEP 2 PLAN: lower nl04 to 0.3, no RF, reduce Ar to 75 ms, NINJA at 1.3, smallest puff. LBO Al at 1.0 sec. CECE timing? Some concern about interferometer drifting. cell access. OUTCOME: Only got down to nl06 of 0.6 instead of 0.3. Not the Ar puff, NINJA was much later, just don't have density control. Try the locked mode to help get the density down. LBO was wimpy -- had to increase aperture (Chilenski) for next shot.
Jul 18 2012 11:56:14:060AM	1120718008	Darin Ernst	PLAN: locked mode for hirex 1120207012 OUTCOME: Yeah, but I grabbed the wrong shot for a locked mode. Maybe 21 from that day. Need to increase PG1 to 100V.
Jul 18 2012 12:08:23:747PM	1120718009	Darin Ernst	PLAN: run the right locked mode shot this time (sorry). increase PG1 to 100 V. OUTCOME: good locked mode. move back to STEP 2
Jul 18 2012 12:29:15:033PM	1120718010	Darin Ernst	PLAN: attempt to reduce nl04 to 0.3 reduced initial D2 puff to about 1/2. lower Bt by 0.02 T for CECE (getting data at 0.87 before this) resume ninja and lbo OUTCOME: Got nl04 = 0.3, but disrupted at 1.0 sec. Was moly, not LBO, according to Matt.
Jul 18 2012 12:51:49:567PM	1120718011	Darin Ernst	PLAN: repeat nl04=0.3 case OUTCOME: massive runaways, locked, asked for nl04=0.3, got 0.25
Jul 18 2012 01:04:43:050PM	1120718012	Darin Ernst	PLAN: aim for nl04=0.4 and increase pre-puff. Can't reduce current to 0.8, since LOC-SOC xition would be nl04=0.45 to 0.55. Also, runaway density threshold goes like Ip. Stay at 1.0 MA. OUTCOME: another runaway case, disrupted ~ 0.65 s, runways from early phase dump out, then new runaways come when density falls (Wolfe). Locked mode started near 0.35 sec, causing density to fall from 0.6 down to 0.25.
Jul 18 2012 01:21:55:117PM	1120718013	Darin Ernst	PLAN: Aim for nl04=0.4. Try pre-puff same as first shot, change ramp rate of density, don't shut puff off. OUTCOME: disrupted 0.6 sec, looks similar.
Jul 18 2012 01:43:35:347PM	1120718014	Darin Ernst	PLAN: shoot for nl04=0.5, boost initial puff to almost double, hopefully to carry density through until control system begins puffing. Matt suggests problem is pumpout once plasma moves away from inner wall, toward cryo. Density falls before control system puffs, causing locked modes. OUTCOME: good, got nl04=0.5. NINJA puff giving +0.05 rise.
Jul 18 2012 02:05:18:283PM	1120718015	Darin Ernst	PLAN: same as 014, but reduce density to nl04=0.4 OUTCOME: locked mode. May have been caused by the density oscillation at 0.47 sec or afterward. Have been increasing derivative gain to reduce oscillations. Also increased initial puff size and duration.
Jul 18 2012 02:14:08:913PM	1120718016	Darin Ernst	PLAN: ramp nl04 slowly down from 0.6 to 0.3 over 1 sec. OUTCOME: good. Density oscillates around request, bumped up by ninja at 1.2s, dropping to 0.45 min.
Jul 18 2012 02:35:15:420PM	1120718017	Darin Ernst	still in STEPS 2-4 PLAN: Similar, but ramp down to 0.3 by 1.0 sec. OUTCOME: Good. Ctr-Co rotation reversal at 0.79 sec (nl04=0.62). Ninja puff stopped density fall at 1.2. Successful ramp from nl04=0.8 to 0.47.
Jul 18 2012 02:48:33:937PM	1120718018	Darin Ernst	PlAN: Ramp density down from 0.6 to 0.3 by 1.0 sec. turn off ninja OUTCOME: good. reached nl04=0.25 by end. Dropping from 0.3 to 0.25 from 1.0 to 1.5 sec. Te0= 3.5 keV at nl04=0.3 and 4.0 keV at nl04=0.25.
Jul 18 2012 03:05:32:533PM	1120718019	Darin Ernst	in STEP 4 PLAN: repeat, but raise final density by 0.05. OUTCOME: good. nl04=0.30 to 0.35 from 1.0 to 1.5 sec.
Jul 18 2012 03:22:27:870PM	1120718020	Darin Ernst	in STEP 4 PLAN: increase density by 0.05 again OUTCOME: no good. Runaway shutdown. No change was made to startup.
Jul 18 2012 03:25:00:967PM	1120718021	Darin Ernst	PLAN: repeat to get nl04=0.4 point OUTCOME:
Jul 18 2012 03:59:50:977PM	1120718022	Darin Ernst	move STEP 6 RF power ramp PLAN: nl04=0.8 constant density Ramp RF power starting 0.8 sec, going to 4MW by 1.5 sec. Add strike point sweep to avoid trouble with probes. OUTCOME: good. Two injections just before RF. nl04 = 0.8. Reversal at 0.84 sec. To reach Te0 = 4.0 keV took 3.4 MW. Hitting the 2.6 keV for GPC Ch9 at inversion radius took 4.0 MW.
Jul 18 2012 04:24:06:490PM	1120718023	Darin Ernst	Begin STEP 7 PLAN: constant density nl04=0.8, constant RF power 1.0 - 1.5 sec 4.0 MW OUTCOME: unwanted fueling or possible I-mode during RF
Jul 18 2012 04:31:44:920PM	1120718024	Darin Ernst	PLAN: back off to 3 MW OUTCOME: good, but density rose to 1.0 during RF. Te0 - 3.1 keV ave.
Jul 18 2012 04:55:31:567PM	1120718025	Darin Ernst	PLAN: nl04 = 0.5, Prf = 1.2 MW OUTCOME: Ninja casues density rise to 0.7, then RF caused rise to 0.9. did not hit nl04=0.5 target.
Jul 18 2012 04:53:58:963PM	1120718026	Darin Ernst	PLAN: aim at nl04=0.4, no ninja. ramp RF power 0.9 to 1.5 MW from 0.5 to 1.0 sec. This should allow a match of Te0 at an intermediate density. The intended match is at nl04=0.5, Prf=1.2 MW, Te0 ~ 3 keV. OUTCOME:
Jul 18 2012 05:23:55:050PM	1120718027	Darin Ernst	LAST SHOT -- Thanks!!! PLAN: lower density, delay RF to 1.0 - 1.5 sec, 1.0 to 1.4 MW. Have to guess at how well density will pump out between 0.5 and 1.0 sec. without RF. Hopefully the power ramp will get us a Te0 we want. OUTCOME: Great shot -- hit the target density nl04=0.55 by aiming at nl04=0.4. Ave. Te0 3-3.2 keV. Thanks to all of you who pushed through this in the control room. We got some very interesting reflectometry data on core fluctuations.

Physics Operator Comments
Jul 18 2012 09:42:28:410AM	1120718001	Syunichi Shiraiwa	Loaded 1120207032 set ne to constant 1e20 set I_bt to constant 150kA set PG1 from 0.3s to 0.4s at 100V moved Fizzle detector timing to 2.1s from 1.8s to ensure that OH coils do double swing. Just notified alternator start up will delay... Result: No power shot. DPCS failure.
Jul 18 2012 10:12:10:417AM	1120718002	Syunichi Shiraiwa	Retry Plasma looks ok. Next: Enable Ar move TF start 0.1s earlier. (-1.1s)
Jul 18 2012 10:27:11:427AM	1120718003	Syunichi Shiraiwa	Got a plasma. HiRex ok. Next: repeat
Jul 18 2012 10:41:42:590AM	1120718004	Syunichi Shiraiwa	Got a plasma Next: Repeat
Jul 18 2012 11:11:23:963AM	1120718005	Syunichi Shiraiwa	Got a plasma. Next: repeat
Jul 18 2012 11:19:19:643AM	1120718006	Syunichi Shiraiwa	Another HiRex shot Next: moving on step 2. changed ne04 to 0.3e20 turn off RF reduce Ninja pressure reduce Ar puff to 75ms
Jul 18 2012 11:38:22:503AM	1120718007	Syunichi Shiraiwa	Density is not low enough. Next: Locked mode loaded 1120207012
Jul 18 2012 11:49:14:900AM	1120718008	Syunichi Shiraiwa	Locked mode shot
Jul 18 2012 11:56:19:583AM	1120718008	Syunichi Shiraiwa	Locked mode shot Next: increas Ar puff to 100 V for a better locked mode calib.
Jul 18 2012 12:13:03:740PM	1120718009	Syunichi Shiraiwa	disrupted at 1.6s Next: reload 1120718007...? set I_bt to 149.5kA reduce puf after 0s in seg1
Jul 18 2012 12:26:02:840PM	1120718010	Syunichi Shiraiwa	disrupted at 1s. ne is about 0.3 before disruption. Next: repeat
Jul 18 2012 01:11:44:937PM	1120718012	Syunichi Shiraiwa	disrupted at 1.39s ne ~ 0.25e20 Next: aiming to get ne04 of 0.4e20 increased seg1 puff to reduce initial runaway population. changed ne04 request 0.375e20
Jul 18 2012 01:12:49:910PM	1120718013	Syunichi Shiraiwa	This shot, tring to produce runaway electrons at the beginngin by adjusting pre-puff and ne request...
Jul 18 2012 01:35:12:483PM	1120718013	Syunichi Shiraiwa	Another locked mode disruption. Next: Adjust density program
Jul 18 2012 01:47:54:757PM	1120718014	Syunichi Shiraiwa	Got a full length plasma. Density is about 0.5e20, but with large fluctuation. Next: requect 0.4 as density during the flat top. keep initial part of density as the same reduced derivative gain of ne pid controller.
Jul 18 2012 01:58:39:247PM	1120718015	Syunichi Shiraiwa	disrupted during ramp-down. locked at 0.85s.
Jul 18 2012 02:08:43:707PM	1120718016	Syunichi Shiraiwa	Did not disrupt.
Jul 18 2012 02:37:14:813PM	1120718017	Syunichi Shiraiwa	Disrupted during ramp-down. Next: Adjust ne to reach low density earlier. Tunr-off ninja
Jul 18 2012 02:50:53:433PM	1120718018	Syunichi Shiraiwa	Density scan from 0.6 to 0.25e20 Large fluctuation in ne around 0.5s. Next: increased density request by 0.05e20
Jul 18 2012 03:06:04:467PM	1120718019	Syunichi Shiraiwa	Disrupted during ramp-down. Next: increase the density request by 0.05e20
Jul 18 2012 03:34:12:343PM	1120718020	Syunichi Shiraiwa	Runway shut-down. Nothing has changed during break-down and ramp-up. Next: retry.
Jul 18 2012 03:44:28:940PM	1120718021	Syunichi Shiraiwa	Got a full length plasma. Ne scanned from 0.7 to 0.4e20 Next: ne04 = 0.8e20 constant. turn-on RF
Jul 18 2012 04:03:27:277PM	1120718022	Syunichi Shiraiwa	Full length plasma ne ~ 0.8e20 injuection before RF starts. Next: no change in PCS
Jul 18 2012 04:30:42:660PM	1120718023	Syunichi Shiraiwa	4MW of ICRF. H-mode ? I-mode? Next: reduce ICRF to 3MW no change in PCS
Jul 18 2012 04:32:49:593PM	1120718024	Syunichi Shiraiwa	similar to shot 23. next: reduce flat top density to 0.5e20 ICRF power 1.9MW
Jul 18 2012 04:48:48:733PM	1120718025	Syunichi Shiraiwa	Full length plasma Density did not decrease. Next: reduce flat-top density to 0.4 turn-off Ninja
Jul 18 2012 05:11:47:810PM	1120718025	Syunichi Shiraiwa	Got full length plasma, but density did not decrease as programmed. Next: delay the start of RF, and will be the last shot.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:35:50:417AM	Plasma	Bad	Critical failure
2	10:02:26:953AM	Plasma	Ok
3	10:17:37:720AM	Plasma	Ok
4	10:32:10:263AM	Plasma	Ok
5	10:47:14:227AM	Plasma	Ok
6	11:04:33:780AM	Plasma	Ok
7	11:24:30:063AM	Plasma	Ok
8	11:46:10:163AM	Plasma	Ok
9	12:02:25:807PM	Plasma	Ok
10	12:17:54:737PM	Plasma	Ok
11	12:34:39:690PM	Plasma	Ok
12	12:56:35:683PM	Plasma	Ok
13	01:13:49:463PM	Plasma	Ok
14	01:35:36:043PM	Plasma	Ok
15	01:50:47:800PM	Plasma	Ok
16	02:06:03:797PM	Plasma	Ok
17	02:23:16:530PM	Plasma	Ok
18	02:40:52:410PM	Plasma	Ok
19	02:58:11:590PM	Plasma	Ok
20	03:17:23:440PM	Plasma	Ok
21	03:31:36:990PM	Plasma	Ok
22	03:50:04:320PM	Plasma	Ok
23	04:09:52:500PM	Plasma	Ok
24	04:25:05:780PM	Plasma	Ok
25	04:41:07:747PM	Plasma	Ok
26	04:58:15:463PM	Plasma	Ok
27	05:13:33:750PM	Plasma	Ok

System Availability

Jul 18 2012 09:35:32:423AM

System Available Comment Availability Changed Owner Description Who Can Change Active MHD no secured - tagged out Jun 2 2008 11:03:58:433AM (sears) Joe Snipes Active MHD Antenna golfit BES yes BES system is online Nov 22 2011 02:21:12:050PM (bespam) Bill Rowan Beam Emission Spectroscopy bespam,liao,rowan Bolometers yes Midplane diodes functioning properly. Midplane bolometers working and calibrated. DIV bolometers installed but not yet toaster calibrated Apr 20 2012 09:57:29:520AM (mlreinke) Matt Reinke Bolometers hutch,mlreinke Boronization yes   Jun 15 2012 05:02:46:313PM (dekow) Jim Irby Boronization dekow,irby CECE yes The system is currently operational for Te tilde measurement. Talk to Choongki about the current configuration Jul 3 2012 04:38:00:317PM (nthoward) Anne White Correlation ECE nthoward,sck83,whitea CNPA yes Multiple channel CNPA available, no safety risk for in-vessel access Apr 14 2011 12:01:59:693PM (parker) Ron Parker Compact Neutral Analyzer parker Cryopump - Upper Divertor yes   Jun 15 2012 05:02:31:550PM (dekow) Brian LaBombard Upper Divertor Cryopump dekow,irby,labombard CXRS yes core-CXRS system is online Nov 22 2011 02:21:22:280PM (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 11:44:46:247AM (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 1 2009 09:45:41:090AM (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 5 2011 02:41:42:867PM (marmar) Earl Marmar Visible Bremsstrahlung Imaging marmar Disruption Mitigation yes two gas jet valves active as of Feb 2012 May 15 2012 10:09:23:597AM (granetz) Robert Granetz Gas Jet granetz,whyte Divertor IR no   Mar 6 2007 10:50:41:677AM  Glen Wurden Divertor IR Digital Video gwurden,terry Divertor IR Spectroscopy no   Mar 6 2007 10:51:39:897AM  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 1 2012 01:24:23:953PM (golynyk) Geoff Olynyk Set of six AXUV diodes in a toroidal array of midplane wall boxes. golynyk,granetz,mlreinke,whyte DNB yes "The beam could break at any moment." May 15 2012 10:09:52:470AM (granetz) Robert Granetz Diagnostic Neutral Beam dterry,granetz,mochung ECDC yes   Apr 26 2012 03:23:19:057PM (dekow) Jim Irby 2.45 GHz, 3 kW, discharge cleaning system dekow,irby,pfeiffer FRC-ECE yes FRC-ECE is online May 14 2012 11:53:01:693AM (bespam) Perry Phillips Heterodyne ECE-32 channels bespam,liao,phillips,rowan,whitea FTCI yes System Operational May 14 2012 11:50:45:590AM (irby) Jim Irby Fast two-color interferometer irby G-Side Ratiomatic yes Installed April 25,2012. New controller installed 5/29/2012 Jun 7 2012 10:40:00:957AM (toland) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland Glow Discharge no HV cables disconnected and power supplies off. Electrical plugs have been disconnected, capped and red tagged. Mar 5 2012 10:21:53:460AM (dekow) Jim Irby 1 kV, 5 A, glow discharge system dekow,dterry,irby GPC yes Operational Apr 27 2012 07:41:46:907AM (hubbard) Amanda Hubbard ECE Polychromater hubbard GPC2 yes Operational Apr 27 2012 07:42:03:317AM (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 1 2009 09:45:50:933AM (terry) Jim Terry Gas Puff Imaging terry,zweben H/D yes system is functional and taking data Dec 5 2011 02:42:29:857PM (marmar) Earl Marmar H/D Ratio marmar HEAT yes   Apr 26 2012 03:23:49:607PM (dekow) Gary Dekow - Machine Heaters - burke,dekow Hirex Jr yes Hirex-Jr has been installed Jun 28 2010 03:36:33:420PM (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 6 2011 08:21:02:453AM (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 12:05:24:810PM (parker) Ron Parker Hard X-Ray Array faust,parker,schmidt ICRF D-Antenna yes   May 31 2012 09:20:06:827AM (wukitch) Steve Wukitch D-port antenna wukitch,ylin ICRF E-Antenna yes   May 31 2012 09:19:57:640AM (wukitch) Steve Wukitch E-port antenna wukitch,ylin ICRF J-Antenna yes   May 31 2012 09:19:47:443AM (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 11:46:02:193AM (blip) Bruce Lipshultz Measurement of recycling light and impurity source rates at multiple surfaces around the tokamak blip,miller Laser Blow-Off yes Pumped Down, Laser has not yet been tested but otherwise operational May 14 2012 04:31:17:037PM (nthoward) Martin Greenwald Impurity Injection System g,nthoward Lower Hybrid yes LH is now available for plasma operation up to ~900 kW net power. Jul 3 2012 02:50:00:693PM (wallaceg) Ron Parker Lower Hybrid dterry,parker,wallaceg Lower Hybrid Reflectometer no off Apr 15 2011 08:24:27:930AM (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. Apr 20 2012 10:43:34:077AM (mlreinke) Matthew L. Reinke Long Wavelength Extreme Ultraviolet Spectrometer markchil,mlreinke LPI no Beam line removed May 30 2008 02:09:12:833PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar Ly-alpha no Midplane Lyman-a not functioning. New B-PORT Lyman (BPLY) still being debugged. Jul 12 2012 08:52:28:233AM (mlreinke) Matt Reinke Lyman alpha cameras faustian,labombard,mlreinke Magnetics yes   Dec 1 2011 11:51:51:970AM (g) Robert Granetz Bp coils and flux loops for equilibrium control granetz,wolfe McPherson no McPherson under vacuum but is not run on a day-to-day basis. Can be requested if desired. LoWEUS has taken over as the primary Mo monitor. Jul 12 2012 08:53:14:937AM (mlreinke) Jim Terry VUV Spectrometer markchil,mlreinke,terry Michelson yes Vacuum 3-4e-8 T. Starting with Michelson at reduced speed. Apr 27 2012 07:42:41:960AM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt MKS yes   Dec 2 2011 12:27:47:163PM (toland) Brian LaBombard Baratron pressure gauges labombard,toland MLP yes Operational. Connected to A-port probe system May 10 2012 08:40:19:910AM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard MSE yes 2/29/2012 MSE operational. No HV or vacuum safety issues Feb 29 2012 12:26:13:863PM (sscott) Steve Scott Motional Stark Effect jinseok,sscott Neutrons yes Voltage is on for He3 detectors on J port. Remaining voltages will be turned on for the first run. Apr 23 2012 09:31:22:063AM (fiore) Catherine Fiore Neutron Detectors fiore Neuts and Hards yes All detectors Powered On --- Waiting for neutrons for calibration Nov 22 2011 01:05:24:380PM (irby) Jim Irby X-Ray/Neutron Detectors at K-Hor irby NINJA yes C-bottom and new F-bottom system ready. Dec 2 2011 12:28:44:843PM (toland) Brian LaBombard NINJA gas puff labombard,terry,toland PCI yes Operational. Jul 10 2012 07:08:06:883PM (ntsujii) Miklos Porkolab Phase Contrast Imaging emd,ennever,ntsujii,porkolab Penning Gauges yes HV power supplies turned ON in INIT, off in RECOOL May 10 2012 08:41:03:000AM (labombard) Brian LaBombard Penning Ionization Gauges labombard Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational. Jul 1 2009 09:46:29:543AM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe Polarimeter yes 3 chords operational but with high noise level Jan 6 2012 04:22:20:903PM (irby) Jim Irby C-Mod Polarimeter irby Power - Alternator Air Switch yes   Apr 26 2012 03:24:21:607PM (dekow) Gary Dekow Alternator to Power Room Power Supply Connection cochran,dekow,dterry,irby Power - PEI yes   Apr 26 2012 03:24:41:250PM (dekow) Gary Dekow PEI System cochran,dekow,dterry,irby Power - TMX yes   Apr 26 2012 03:24:57:153PM (dekow) Gary Dekow Ef2s,. EFCs and A-Coils byford,cochran,dekow,dterry,irby Power Systems yes   Apr 26 2012 03:25:14:497PM (dekow) Jim Irby C-Mod Magnet Supplies byford,cochran,dekow,dterry,irby Probe Array - ISD yes Operational. Some dead probes. May 10 2012 08:41:58:120AM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard Probe Array - LH yes Operational. 4 out of 6 probes working. May 10 2012 08:41:40:557AM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard Probe Array - OSD yes Operational. May 10 2012 08:42:13:733AM (labombard) Brian LaBombard Outer Lower Divertor Probe Array (F and J) labombard Probe Array - UDIV yes Operational. Some dead probes. May 10 2012 08:42:32:663AM (labombard) Brian LaBombard Upper Divertor Probe Array labombard Reflectometer yes On 1120608, the high frequency channels: 112, 140 and the variable, have been disconnected for some troubleshooting. All other channels are connected Jun 14 2012 11:28:59:603AM (dominguez) Earl Marmar Reflectometer dominguez,marmar Scanning Probe - ASP yes Operational. A variety of probe heads are ready for use. May 10 2012 08:43:10:937AM (labombard) Brian LaBombard A-Port Scanning Probe labombard Scanning Probe - FSP yes Operational. May 10 2012 08:43:24:887AM (labombard) Brian LaBombard F-Port Scanning Probe labombard Scanning Probe - WASP no Not functioning. Probe tips are melted. Repair not performed during break. May 10 2012 08:44:43:137AM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick Shoelace Antenna yes Operational May 10 2012 08:45:08:320AM (labombard) Brian LaBombard High-k active MHD antenna, for QCM, WCM studies golfit,labombard SOL reflectometer yes c-port (top, middle, bottom) and h-port available. Only 1 of 4 locations can be used for each discharge May 1 2012 04:54:58:820PM (cornwall) Cornwall Lau SOL reflectometer cornwall,wukitch,ylin Sparker yes Sparker Power Supply powered up. Connected at K port using red cable 4/23/12 9:25AM Apr 23 2012 12:06:10:983PM (parkin) Jim Irby Field Emission Preionization for C-Mod dekow,irby,parkin Surface Science Station yes SSS is under vacuum and fully available. Jul 3 2012 02:46:59:753PM (ochoukov) Bruce Lipschultz Radially scanning probe located on K-port blip,ochoukov TCI yes TCI lasers in operation May 14 2012 11:51:18:700AM (irby) Jim Irby Two-Color Interferometer irby,murray TS - Core yes Operating with one 50Hz laser, precise density calibration still required. May 9 2012 03:12:32:050PM (jwhughes) Jerry Hughes Core Thomson scattering jrwalk,jwhughes,yma TS - Edge yes Operating with one 50Hz laser, precise density calibration still required. May 9 2012 03:12:51:363PM (jwhughes) Jerry Hughes Millimeter resolution edge Thomson scattering jrwalk,jwhughes,yma Vispec no 350 and 670 nm, 4 spatial channels Nov 28 2007 09:58:35:493AM (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. Apr 20 2012 10:43:43:107AM (mlreinke) Matt Reinke X-ray Extended Ultraviolet Spectrometer markchil,mlreinke XTOMO yes ARRAY1->5 available. Specific channels on various arrays display issues. Apr 20 2012 05:36:28:523PM (faustian) Robert Granetz X-Ray Tomography faustian,granetz,mlreinke

Jul 27 2012 10:29:46:043AM

FRCECE Post Run Calibration initial survey: channel 32 is used for digitizer test This is the first FRCECE calibration that's been done since Ken Liao readjusted the FRCECE waveguide and horn. Signal has increased by a factor of 4 on the inner channels and a factor of 2 on the outer channels. S/N ratio on the system is very high, though, so old data should still be useful. Calibration: Shots 1120718007, 008, 010 are used for calibration. Checked for a several plasmas including 1120718005, 016, 021 Detailed calibration available on request.' edit - noticed a mistyped shot number