Miniproposals

Miniproposal: 631 Date Filed: 12/6/2010 Title: H-mode power threshold scaling with plasma density using off-axis ICRF heating First Author: Yunxing Ma Session Leader: Yunxing Ma (shots 1-34)

Engineering Operator Run Comment

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Session Leader Plans

Entered: Jan 12 2011 05:52:20:687PM

Author: Yunxing Ma

Run plan for 1110114 SL: Yunxing Ma PO: Bill Rowan MP: MP631 The main goal of this run is to investigate the dependence of power deposition profile (heating locations, on-axis/off-axis) on H-mode power threshold and L-H transition. Results from this experiment serve the companion objectives of exploring the proposal of I-mode at low densities (nl04<0.6), Bt dependence of H-mode access at higher densities. *** This will be an 80Mhz+70Mhz, multiple BTs run *** *** This run plan should not be rigorously followed. The targets are subject to immediate minor adjustments based on the judgments SL makes during the run *** Operational parameter space: Bt/Ip = 5.2T/1.0MA, 4.5T/0.9MA, 3.9T/0.8MA (### note that the target Bt and Ip are one-to-one matched ###) nl04 = 0.3, 0.8 RF antenna is set up to work at two frequencies: D&E at 80Mhz, J at 70Mhz cryopump ON Diagnostics requirement: TS (core+edge, edge fiber need to be optimized for normal magnetic configuration) GPC/GPC2 (set up for 3.9T), FRCECE X-mode reflectometer (ready for profile and fluctuation measurements) CXRS, Hirex PCI, GPI, O-mode reflectometer, magnetics Discharges sequence: First, load the magnetic geometry from the target discharge of shot 1101221006, and modify the plasma parameters to be Bt=5.2T, Ip=1.0MA, and nl04(L-mode)= 0.3. The value of density is close to ITER L-mode operational target. Also, an I-mode like phase was previously discovered near this density level. Then scan Bt/Ip at the 3 targets indicated above. For each combination RF antennas will be operated at one individual frequency (either 80Mhz or 70Mhz) a time (in a single discharge); while both frequencies need to be tried. The 2nd harmonics resonance layers are separated and sample a number of locations ranging from far off-axis (rho=0.9) to on-axis heating from the Bt scan (see figure below). Required RF power for H-mode access is anticipated to be high at the low density level, can be as much as 3+ MW with Bt=5.4T. Pth of 80Mhz vs 70Mhz heating from the same Bt will be compared, looking for what/where the effect of power deposition is. Since Pth is strongly nonlinear (enhance substantially with decreasing ne) at below H-mode low density limit, a good density control is highly desired for this comparison. Unfortunately, the power of cryopump may not be fully used in LSN, but we request it to be turned on in order to ameliorate the situation as much as it can. If the density can't be controlled very well, a few shots would be required at each operational target to cover the density variation. If there are difficulties to access H-mode at Bt=5.2T even with maximum allowed RF power from one frequency, then increase the target L-mode density to nl04=0.4 where Pth can be reduced by ~1.0MW. The second section of the run is simply repeating the above steps with nl04=0.8. This part is relatively less demanding in rigorous density control than the above one (low ne), since it's already known that the density dependence of Pth near this value of nl04 is very weak. Furthermore, the required target RF power for H-mode is much less here (1~2MW will be adequate). If time permits, we'll spend a few shots to make up the CXSR and GPI measurements for MP625, which we missed last time from previous run 1101221. Minimum required discharges (24 shots): Bt=5.2T, Ip=1.0MA, nl04=0.3-0.4, RF=80MHz, 2 shots Bt=5.2T, Ip=1.0MA, nl04=0.3-0.4, RF=70MHz, 2 shots Bt=4.5T, Ip=0.9MA, nl04=0.3-0.4, RF=80Mhz, 2 shots Bt=4.5T, Ip=0.9MA, nl04=0.3-0.4, RF=70Mhz, 2 shots Bt=3.9T, Ip=0.8MA, nl04=0.3-0.4, RF=80Mhz, 2 shots Bt=3.9T, Ip=0.8MA, nl04=0.3-0.4, RF=70Mhz, 2 shots Bt=5.2T, Ip=1.0MA, nl04~0.8, RF=80MHz, 2 shots Bt=5.2T, Ip=1.0MA, nl04~0.8, RF=70MHz, 2 shots Bt=4.5T, Ip=0.9MA, nl04~0.8, RF=80Mhz, 2 shots Bt=4.5T, Ip=0.9MA, nl04~0.8, RF=70Mhz, 2 shots Bt=3.9T, Ip=0.8MA, nl04~0.8, RF=80Mhz, 2 shots Bt=3.9T, Ip=0.8MA, nl04~0.8, RF=70Mhz, 2 shots *** Figure shows the 2nd harmonic resonance layers at 3 BTs for 80/70Mhz RF frequencies. Also illustrated are the LCFS and rho=0.9, rho=0.8 flux surfaces ***

Physics Operators Plans

Entered: Jan 13 2011 01:56:54:693PM

Author: Bill Rowan

----------------- Engineering Setup ----------------- Run begins at 09:00 and ends at 17:00 Power systems as on: 1101221006 Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid Enabled Gas setup: Fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid DISABLED (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill NINJA with 10 psi D2 DISABLED Enable gate-valves and shutters: ECE, VUV, HiREX Sr, Xeus Leave z-bolo shutter as is (should be open) Torvac gatevalve toggle (yes/no): no Boronization(yes/no): no Overnight ECDC (yes/no): yes, ECDC in helium ICRF(yes/no): yes LH(yes/no): no Cryopump (yes/no): yes DNB (yes/no): yes Vessel temperature: 35/35/35 ------------------------------ ECDC Parameters (if requested) ------------------------------ gas and pressure: Helium at 5e-5 Torr sweep: 44/45/103 cm scan: 20/120 s If there are difficulties in keeping ECDC going, increase Helium pressure to 1.0e-04 Torr ECDC at the higher pressure copies the prescription used for the Thursday run. ------------------------------ Diagnostics required ------------------------------ TS (core+edge, edge fiber need to be optimized for normal magnetic configuration) GPC/GPC2 (set up for 3.9T), FRCECE X-mode reflectometer (ready for profile and fluctuation measurements) CXRS, Hirex PCI, GPI, O-mode reflectometer, magnetics

Session Leader Summaries

Entered: Jan 18 2011 10:26:09:127PM

Author: Yunxing Ma

Run summary of 1110114 The goal of this run is to investigate the effect of heating deposition profile on the H-mode power threshold and L-H transition. Companion goals of the run are exploring the Bt dependence of Pth at lower density (nbar>1.0n20), and low density H-mode behavior. The run is successful. Totally 34 shots were created, with 3 disruptions and 1 fizzle. We got a number of meaningful results: 1. The first half of the run was conducted at intermediate density of nl04~0.8 (nbar~1.5n20), with 3 Bt scans at 5.2,4.5,3.9T. For each target 70Mhz (J ant) and 80Mhz (D&E) were applied once at a time (in a single shot). Pth was compared between these two heating scenarios (comparison between on-axis with off-axis). It was found that Pth was basically unchanged (~2.0MW), unless the 2nd harmonic resonance was far off-axis in the HFS (3.9T, 80MHz), where Pth doubled (Pth~4MW). The reason could be due to RF physics, e.g. one conjecture is that the coupling there was very poor, verified by very slight enhancement of Wmhd even with 3MW RF injection. However, the real reason(s) need to be worked out after a certain amount of analysis (perhaps running RF code is requred to figure out the specific power deposition profile). By comparing the off-axis heating shots (res layer all nearly midway in minor radii), we found that Pth was almost the same ~2.0MW for different Bts. This confirms that the Bt dependence does go away at higher densities, as speculated before based on database mining. 2. The second half of the run is to explore the Pth and H-mode behavior at low densities. The target density was maintained around nl04=0.45, equivalently, nebar=0.9n20 for Bt=5.2T at L-H; and nl04=0.4,nebar=0.7 for Bt=4.5T at L-H. Again, so significant difference was found between 70Mhz and 80Mhz heating schemes. In addition, Pth does decrease with lowering Bt, say Pth~2.5MW at 5.4T, 0.9n20, expected to be around 3.0MW at 0.7n20; and Pth~2.0MW for Bt=4.5T,nbar=0.75n20 (comparison in on-axis heating scenario). But Pth tends to go up again for 3.9T, but that (only) one was the last shot today, with HFS off-axis heating (70Mhz). So the conclusion might be that Pth would increase in HFS minority case. More details will be worked out after careful analysis. A WCM at about 100Khz was persistent in these low density shots, but the 200Khz WCM as in I-mode was just marginally found in shot 25 (seems coexistence with the 100Khz one). This frequency range is about the QCM, but this mode occurs even in early RF L-mode phase. 3. Another important harvest is that at the low target density (nl04~0.4), we got clear direct transition to ELMy H-mode at Bt=4.5T and Bt=3.9T (see shot 28,32,34). It's worthi mentioning that these ELMs were formed with normal magnetic geometry, NOT the JFT-2M one, which we used have to go for at higher densities. Further, the H-mode density is very low, for exmaple, in shot 34 (Bt=3.9T), nl04 in H-mode was 0.55! As Amanda mentioned in logbook, this may be the remedy for LHCD in H-mode. In shot 2, whereBt=5.4T, an ELMy H-mode formed following the ELMy free phase, and again, H-mode density become well regulated, very likely due to the onset of ELMs. This is an interesting outcome, which may call for furthure research efforts on ELMs at lower densities. Diagnostics: We have an almost complete existing C-mod diagnostics set working today! CXRS was working the entire day, which will give good measurements of edge Ti and Vt in L- and H-mode and L-H transition; Hirex was on to monitor core Ti and rotation; X-mode reflectometer was on every shot, worth mentioning that it may provide a whole edge density profile (up to pedestal top) evolution in ~ms time scale at for some shots (e.g. shot 34); GPI have collected good data for fluctuation dynamics studies at L-H. Unfortunately, PCI was not available after shot 6 due to a chiller issue. *** Summary of Pth as shots (rough cal based on "analysis" tree *** shot# t(L->H) ne Ploss Pnet Bt Ip q95 ssep fRF Rres ELMY 1110114001 1.260 0.88 2.3 1.75 5.2 1.0 3.3 -0.9 80 65 Y 1110114002 1.070 0.87 2.3 1.60 5.2 1.0 3.3 -0.9 70 75 Y 1110114003 0.720 1.57 2.1 1.76 5.2 1.0 3.4 -0.9 80 65 N 1110114004 0.837 1.60 1.55 1.20 5.2 1.0 3.4 -0.9 80 65 N 1110114005 0.770 1.57 1.53 1.20 5.2 1.0 3.4 -0.9 80 65 N 1110114006 0.963 1.62 2.16 1.92 5.2 1.0 3.4 -0.9 70 75 N 1110114007 0.932 1.63 2.0 1.72 5.2 1.0 3.4 -0.9 70 75 N 1110114008 NA 1110114009 1.050 1.68 2.10 1.60 4.6 0.9 3.3 -0.9 80 57 N 1110114010 0.896 1.45 2.0 1.51 4.6 0.9 3.3 -0.9 80 57 N 1110114011 NA 1110114012 0.916 1.58 2.0 1.50 4.6 0.9 3.3 -0.9 80 57 N 1110114013 NA 4.0 0.8 3.3 -0.9 80 50 1110114014 NA 4.0 0.8 3.3 -0.9 80 50 1110114015 1.265 1.59 3.8 3.0 4.0 0.8 3.3 -0.9 80 50 N 1110114016 1.186 1.44 4.1 3.3 4.0 0.8 3.3 -0.9 80 50 N 1110114017 1.355 1.44 4.1 3.3 3.9 0.8 3.3 -0.9 80 49 N 1110114018 0.963 1.42 2.0 1.7 4.0 0.8 3.3 -0.9 70 57 N 1110114019 0.927 1.48 2.1 1.8 4.0 0.8 3.3 -0.9 70 57 N 1110114020 0.839 1.54 2.0 1.7 4.6 0.9 3.3 -0.9 70 65 N 1110114021 0.950 1.56 2.0 1.7 4.6 0.9 3.3 -0.9 70 65 N 1110114022 NA 1110114023 1.100 0.90 2.2 1.4 5.2 1.0 3.4 -0.9 80 65 Y 1110114024 NA 1110114025 0.880 0.92 1.5 0.73 5.2 1.0 3.3 -0.9 70 75 N 1110114026 1.245 0.92 2.3 1.6 5.2 1.0 3.4 -0.9 70 75 N 1110114027 1.200 0.75 2.9 1.9 5.2 1.0 3.4 -0.9 70 75 N 1110114028 0.860 0.72 2.0 1.25 4.6 0.9 3.3 -0.9 70 65 Y 1110114029 NA 1110114030 NA 1110114031 NA 1110114032 0.922 0.72 2.0 1.38 4.6 0.9 3.3 -0.9 70 65 Y 1110114033 NA 1110114034 0.860 0.72 2.2 1.60 3.9 0.8 3.2 -0.9 70 57 Y *** Summary of Pth as BT,ne (more accurate cal based on "efit01" tree (fast EFIT) *** ========= 5T, 0.9n20 ============ shot# t(L->H) ne Ploss Pnet Bt Ip q95 ssep fRF Rres ELMY 1110114001 1.260 0.87 1.94 1.44 5.2 1.0 3.3 -0.9 80 65 Y 1110114002 1.070 0.84 2.38 1.70 5.2 1.0 3.3 -0.9 70 75 Y 1110114023 1.100 0.91 2.40 1.61 5.2 1.0 3.4 -0.9 80 65 Y 1110114024 NA 1110114025 0.880 0.94 1.50 1.20 5.2 1.0 3.3 -0.9 70 75 N 1110114026 1.249 0.90 2.52 1.63 5.2 1.0 3.4 -0.9 70 75 N 1110114027 1.200 0.74 3.00 2.00 5.2 1.0 3.4 -0.9 70 75 N 1110114027 1.355 1.02 2.70 1.70 5.2 1.0 3.4 -0.9 70 75 N ========= 5T, 0.9n20 ============ 1110114003 0.720 1.55 1.88 1.58 5.2 1.0 3.4 -0.9 80 65 N 1110114003 0.872 1.89 2.40 1.71 5.2 1.0 3.4 -0.9 80 65 N 1110114003 1.013 1.98 2.10 1.41 5.2 1.0 3.4 -0.9 80 65 N 1110114003 1.144 2.36 3.57 2.41 5.2 1.0 3.4 -0.9 80 65 N 1110114003 1.258 2.15 2.40 1.65 5.2 1.0 3.4 -0.9 80 65 N 1110114003 1.385 2.23 2.26 1.54 5.2 1.0 3.4 -0.9 80 65 N 1110114004 0.837 1.58 1.60 1.22 5.2 1.0 3.4 -0.9 80 65 N 1110114004 0.998 1.87 2.15 1.63 5.2 1.0 3.4 -0.9 80 65 N 1110114004 1.111 2.24 3.24 2.39 5.2 1.0 3.4 -0.9 80 65 N 1110114004 1.113 2.27 2.36 1.54 5.2 1.0 3.4 -0.9 80 65 N (2nd) 1110114004 1.219 2.31 2.77 1.91 5.2 1.0 3.4 -0.9 80 65 N 1110114004 1.330 2.34 3.21 2.41 5.2 1.0 3.4 -0.9 80 65 N 1110114004 1.332 2.35 2.90 2.15 5.2 1.0 3.4 -0.9 80 65 N (2nd, Te0 Oscillation) 1110114005 0.770 1.57 1.63 1.32 5.2 1.0 3.4 -0.9 80 65 N 1110114005 1.369 2.45 3.06 2.34 5.2 1.0 3.4 -0.9 80 65 N 1110114006 0.963 1.60 2.03 1.78 5.2 1.0 3.4 -0.9 70 75 N 1110114006 1.257 2.01 2.14 1.72 5.2 1.0 3.4 -0.9 70 75 N 1110114007 0.932 1.60 1.88 1.61 5.2 1.0 3.4 -0.9 70 75 N 1110114007 1.124 1.63 2.01 1.77 5.2 1.0 3.4 -0.9 70 75 N 1110114008 NA ========= 4.6T, 0.9n20 ============ 1110114028 0.860 0.71 2.20 1.43 4.6 0.9 3.3 -0.9 70 65 Y 1110114032 0.922 0.71 2.30 1.76 4.6 0.9 3.3 -0.9 70 65 Y ========= 4.6T, 1.5n20 ============ 1110114009 1.050 1.62 2.11 1.53 4.6 0.9 3.3 -0.9 80 57 N 1110114009 1.257 2.12 2.40 1.70 4.6 0.9 3.3 -0.9 80 57 N 1110114009 1.050 2.29 2.56 1.83 4.6 0.9 3.3 -0.9 80 57 N 1110114010 0.896 1.39 2.07 1.51 4.6 0.9 3.3 -0.9 80 57 N 1110114010 1.205 1.76 2.15 1.44 4.6 0.9 3.3 -0.9 80 57 N 1110114010 1.316 1.95 2.01 1.40 4.6 0.9 3.3 -0.9 80 57 N 1110114011 NA 1110114012 0.916 1.52 1.91 1.46 4.6 0.9 3.3 -0.9 80 57 N 1110114012 1.026 1.75 2.08 1.45 4.6 0.9 3.3 -0.9 80 57 N 1110114012 1.125 1.82 1.90 1.41 4.6 0.9 3.3 -0.9 80 57 N 1110114012 1.218 1.89 2.00 1.40 4.6 0.9 3.3 -0.9 80 57 N 1110114020 0.839 1.54 2.04 1.72 4.6 0.9 3.3 -0.9 70 65 N 1110114020 0.954 1.72 2.02 1.57 4.6 0.9 3.3 -0.9 70 65 N 1110114020 1.335 2.30 2.76 2.10 4.6 0.9 3.3 -0.9 70 65 N 1110114021 0.950 1.48 1.64 1.30 4.6 0.9 3.3 -0.9 70 65 N 1110114021 1.061 1.67 1.89 1.60 4.6 0.9 3.3 -0.9 70 65 N 1110114021 1.174 1.63 1.87 1.61 4.6 0.9 3.3 -0.9 70 65 N 1110114021 1.325 2.12 2.65 2.06 4.6 0.9 3.3 -0.9 70 65 N ========= 4.0T, 0.9n20 ============ 1110114034 0.860 0.71 1.87 1.31 3.9 0.8 3.2 -0.9 70 57 Y ========= 4.0T, 1.5n20 ============ 1110114013 NA 4.0 0.8 3.3 -0.9 80 50 1110114014 NA 4.0 0.8 3.3 -0.9 80 50 1110114015 1.263 1.51 3.51 2.93 4.0 0.8 3.3 -0.9 80 50 N 1110114016 1.186 1.40 4.03 3.30 4.0 0.8 3.3 -0.9 80 50 N 1110114017 1.355 1.39 4.11 3.30 3.9 0.8 3.3 -0.9 80 49 N 1110114018 0.963 1.41 1.98 1.72 4.0 0.8 3.3 -0.9 70 57 N 1110114018 1.073 1.58 2.02 1.71 4.0 0.8 3.3 -0.9 70 57 N 1110114018 1.165 1.65 2.18 1.75 4.0 0.8 3.3 -0.9 70 57 N 1110114018 1.267 1.84 2.08 1.62 4.0 0.8 3.3 -0.9 70 57 N 1110114018 1.358 1.77 2.06 1.66 4.0 0.8 3.3 -0.9 70 57 N 1110114019 0.927 1.45 2.09 1.76 4.0 0.8 3.3 -0.9 70 57 N 1110114019 1.384 2.15 2.40 1.84 4.0 0.8 3.3 -0.9 70 57 N

Physics Operator Summaries

Entered: Jan 17 2011 01:11:42:680PM

Author: Bill Rowan

Purpose: MP631, H-mode power threshold scaling with plasma density using off-axis ICRF heating, SL: Yunxing Ma In this experiment, the h-mode power threshold was sought for various ICRF locations (that is, various BT settings) and for two densities. The startup was loaded from 1110113035. That startup had worked well throughout run 1110113 with only one minor change. For this run, most of the data was taken for the higher of the two densities and without problems. The low density discharge ran adequately, but there is a locked mode just below the density at which we ran the low density cases. It appeared near 0.5 s on several shots. The EF1U early commutation appeared again for one shot and resulted in the single dud of the day. Score card 32 plasmas 1 fizzle 1 dud (engineering, power supply) 34 total

Session Leader Comments
Jan 14 2011 09:13:20:867AM	1110114001	Yunxing Ma	nl04=0.2 at L-H. very low density. RF D&E 3MW, seem to work, although trips a little. Pth~4MW. Next shot, increase nl04 to 0.4, J antenna only, ramp up from 1.0 to 3.0MW
Jan 14 2011 09:34:22:737AM	1110114003	Yunxing Ma	increase nl04 to 0.8, D&E 1.0MW to 3.0MW
Jan 14 2011 09:46:49:693AM	1110114003	Yunxing Ma	Multiple H-modes Defined first transition at 0.55s, nbar=1.5, Pth=2.0MW.
Jan 14 2011 09:41:56:080AM	1110114004	Yunxing Ma	Bt=5.2T, keep nl04 to be 0.8, D&E only, ramp up from 0.5MW to 2.0MW.
Jan 14 2011 09:53:58:083AM	1110114004	Yunxing Ma	L-H at 0.837s, nbar~1.6, Pth back to 1.5MW
Jan 14 2011 09:56:11:070AM	1110114005	Yunxing Ma	This shot, RF D&E only, step waveform, 0.8->1.0->1.2MW
Jan 14 2011 10:08:16:513AM	1110114005	Yunxing Ma	L-H at 0.767s, nbar=1.5, Pth~1.55MW next shot, J antenna (70Mhz), power ramp from 0.5 to 2.0MW
Jan 14 2011 10:38:06:770AM	1110114006	Yunxing Ma	L-H at 0.962s, nbar=1.62, Pth~2.0MW J ant, 70Mhz
Jan 14 2011 10:25:16:223AM	1110114007	Yunxing Ma	this shot, lower the targe density a little, to 8.0
Jan 14 2011 10:37:25:253AM	1110114007	Yunxing Ma	L-H at 0.933s, nbar=1.63n20, Pth=2.0MW J ant, 70MHz heating
Jan 14 2011 10:41:58:020AM	1110114008	Yunxing Ma	this shot, J ant, power step 0.8->1.0->1.2MW lower the targe density slightly, to 7.8
Jan 14 2011 10:47:15:470AM	1110114008	Yunxing Ma	no RF this shot
Jan 14 2011 10:53:25:830AM	1110114009	Yunxing Ma	this shot, Bt=4.5, Ip=0.9MA target ne=7.8 D&E ant, 80Mhz, off axis, ramp up from 0.5 to 2.0MW
Jan 14 2011 11:03:09:070AM	1110114009	Yunxing Ma	L-H at 1.05s, nbar=1.66, Pth=2.3MW
Jan 14 2011 11:06:55:553AM	1110114010	Yunxing Ma	decrease target ne to 7.6 D&E ant, RF steps 1.1->1.3->1.5MW
Jan 14 2011 11:16:05:913AM	1110114010	Yunxing Ma	L-H at 0.895s, nbar=1.45, Pth=2.0MW
Jan 14 2011 11:21:38:840AM	1110114011	Yunxing Ma	this shot, J ant (70Mhz, on axis heating), power ramp from 0.5 to 2.0MW
Jan 14 2011 11:30:03:440AM	1110114011	Yunxing Ma	no RF this shot.
Jan 14 2011 11:33:18:253AM	1110114012	Yunxing Ma	this shot, repeat shot 10, with target density=7.7 D&E ant, 80Mhz, off-axis
Jan 14 2011 11:45:04:030AM	1110114012	Yunxing Ma	L-H at 0.915s, nbar=1.58, Pth = 2.0MW
Jan 14 2011 11:47:14:893AM	1110114013	Yunxing Ma	this shot, Bt=3.9T, Ip=0.8MA, ne=7.7 RF: D&E ant (80Mhz, far off axis heating), power ramp, from 0.5 to 2.0MW
Jan 14 2011 12:14:47:050PM	1110114014	Yunxing Ma	this shot, repeat shot 13, D&E, ramp up from 0.5 to 3.0MW
Jan 14 2011 12:23:24:747PM	1110114014	Yunxing Ma	this shot, repeat shot 13, D&E, ramp up from 0.5 to 3.0MW
Jan 14 2011 12:33:18:420PM	1110114014	Yunxing Ma	No H-mode even with 1.5MW E ant alone. One H mode at 1.45s, perhaps ramp down? But it might also be due to 1.0MW J there.
Jan 14 2011 12:34:11:600PM	1110114015	Yunxing Ma	this shot, repeat shot 14, with D&E D didn't work well last shot
Jan 14 2011 12:48:19:897PM	1110114015	Yunxing Ma	there seems to be a brief H-mode at 1.262s, nbar=1.53, Pth~3.5MW!
Jan 14 2011 01:02:40:427PM	1110114016	Yunxing Ma	2 H-modes 1st L-H at 1.18s, nbar=1.45, Pth=3.8MW 2nd L-H at 1.31s, nbar=1.50, Pth=3.73MW
Jan 14 2011 01:13:01:000PM	1110114017	Yunxing Ma	1st H-mode at 1.354s, nbar=1.43, Pth=4.0MW Worst Pth.
Jan 14 2011 01:13:50:133PM	1110114018	Yunxing Ma	this shot, target Bt=3.9T J ant, ramp, 0.5 to 2.0MW
Jan 14 2011 01:26:56:887PM	1110114018	Yunxing Ma	several H-modes 1st H-mode at 0.96s, nbar=1.4, Pth=2.0MW
Jan 14 2011 01:41:47:277PM	1110114019	Yunxing Ma	H-mode at 0.927s, nbar=1.48, Pth=2.1MW
Jan 14 2011 01:48:21:780PM	1110114020	Yunxing Ma	this shot, Bt=4.5T, Ip=0.9MA, J ant (70Mhz, on axis)
Jan 14 2011 01:57:50:040PM	1110114020	Yunxing Ma	Many H-modes 1st transition at 0.84s, nbar=1.54, Pth=2.0MW
Jan 14 2011 02:12:02:050PM	1110114021	Yunxing Ma	Many H-modes 1st L-H at 0.951s, nbar=1.58, Pth=2.0MW
Jan 14 2011 02:15:44:987PM	1110114022	Yunxing Ma	Repeat the targets from shot 1: Bt=5.2T, Ip=1.0MA, nl04=0.3 D&E ant, ramp from 1.0 to 3.0MW
Jan 14 2011 02:27:25:933PM	1110114022	Yunxing Ma	early disruption, some injections next, repeat
Jan 14 2011 02:46:09:140PM	1110114023	Yunxing Ma	L-H at 1.1s, nbar=0.9, Pth=2.3MW Next shot, try decrease target density to 0.35
Jan 14 2011 02:57:20:827PM	1110114025	Yunxing Ma	this shot, go back to the targe to shot 23 (nl04=0.4) J ant, off-axis, ramp from 1.0 to 3.0MW
Jan 14 2011 03:13:12:127PM	1110114025	Yunxing Ma	L-H at 0.88s, nbar=0.92, Pth=1.5MW next, repeat
Jan 14 2011 03:31:47:517PM	1110114026	Yunxing Ma	brief H-mode L-H at 1.248s, nbar=0.93, Pth=2.3MW
Jan 14 2011 03:36:15:397PM	1110114027	Yunxing Ma	Clear L-H at 1.2s, nbar=0.75, Pth=2.9MW next shot, set Bt=4.5T, Ip=0.9MA, J ant
Jan 14 2011 03:51:01:000PM	1110114028	Yunxing Ma	L-H at 0.86s, nbar=0.71, Pth=2.0MW. seemingly some ELMy like behavior next, repeat
Jan 14 2011 04:20:23:350PM	1110114029	Yunxing Ma	disruption
Jan 14 2011 04:20:36:157PM	1110114030	Yunxing Ma	fizzle
Jan 14 2011 04:26:01:447PM	1110114031	Yunxing Ma	fizzle
Jan 14 2011 04:45:24:540PM	1110114032	Yunxing Ma	Back to get H-mode L-H at 0.922s, nbar=0.72, Pth=2.0MW, ELMy behavior next, switch to D&E, same ramp up

Physics Operator Comments
Jan 14 2011 08:24:41:620AM		Bill Rowan	ecdc in D2 until 6 am switch over to helium at 1.0e-04 Torr at 6 am about 90 minutes in helium Use shot 1110113035 for the startup. Recommended by the PO for that run. Note that it followed a fizzle and has a small change in EF4 The starting shot requested by SL is 1101221006 It uses segment 02. Load 1110113035 dpcs_fizzle turned on dpcs_xjump turned on dpcs_piezo_chopper turned on 50 ms on PG4 import segment 2 from 1101221006 into segment 2 turn off segment 3 which was used for 1110113035 turned on segment 2 change/check BT=5.2 T (-144800 A) IP=1.0 MA ml_04=0.3e+20 Load.
Jan 14 2011 09:14:08:990AM	1110114001	Bill Rowan	001. Plasma full length BT=5.2 T IP=1 MA nl_04=0.24e+20 Next shot. Raise nl_04 by approximately 1e+19 RF ramp added
Jan 14 2011 09:33:43:410AM	1110114002	Bill Rowan	002. Plasma full length nl_04 = 3e+19 before H-mode JT: ELMs after 1.2 s, maybe clamped density Next shot. cell access to change TS fibers nl_04 = 0.8e+20
Jan 14 2011 09:38:52:930AM	1110114003	Bill Rowan	003. plasma full length nl_04 = 0.84e+20 multiple h-modes Next shot. no pcs changes
Jan 14 2011 09:58:19:660AM	1110114004	Bill Rowan	004. plasma full length multiple h-modes Next shot. enabled b-side lower (Ar) PG1 (Ar) 35 ms starting at 0.3 Inner wall gas puff enabled and will go at 1.2s nl_04 = 0.82e+20 (SL request)
Jan 14 2011 10:10:13:707AM	1110114005	Bill Rowan	005. plasma full length nl_04 = 0.82e+20 multiple h-modes Next shot no pcs changes RF changing frequency -- 70 MHz
Jan 14 2011 10:23:14:237AM	1110114006	Bill Rowan	006. Plasma full length 3 h-modes Next shot. lower target density to 0.82e_20
Jan 14 2011 10:35:04:690AM	1110114007	Bill Rowan	007. plasma full length several h-modes RF is affecting density slightly next shot. increase argon. PG1 to 45 ms duration lower target density to 0.78e+20
Jan 14 2011 10:54:31:157AM	1110114008	Bill Rowan	008. plasma full length nl_04 constant at 0.8e+20 No h-modes on that shot No RF on that shot. Next shot. Lower BT to 4.5 T (125300A) IP = 0.9 MA nl_04 demand unchanged from 0.78e+20
Jan 14 2011 11:07:30:220AM	1110114009	Bill Rowan	009. plasma full length multiple h-modes BT=4.5 T after 0.35 s IP = 0.9 MA after 0.5 s next shot. cell access for GPI nl_04 demand to 0.76e+20
Jan 14 2011 11:20:32:293AM	1110114010	Bill Rowan	010. plasma full length multiple h-modes nl_04=0.76e+20 just before first h-mode dithering before the first transition next shot. No change in the target -- no change in the pcs
Jan 14 2011 11:33:57:887AM	1110114011	Bill Rowan	011. plasma full length no rf on that shot no h-modes on that shot nl_04 = 0.75e+20 next shot nl_04 demand changed to 0.77e+20
Jan 14 2011 11:48:44:670AM	1110114012	Bill Rowan	012. plasma full length multiple h-modes next shot cell access for RF BT = 3.9 T (108600A) IP = 0.8 MA
Jan 14 2011 12:26:18:727PM	1110114013	Bill Rowan	013. Plasma full length IP=0.8 MA BT=4.0T nl_04 = 0.73e+20 No h-modes next shot cell access for RF
Jan 14 2011 12:35:14:187PM	1110114014	Bill Rowan	014. Plasma full length -- disruption in ramp down no h-modes during plateau -- maybe in ramp down next shot. No change in target No pcs changes
Jan 14 2011 12:46:14:163PM	1110114015	Bill Rowan	015, Plasma almost full length at 1.44s Injections throughout shot next shot no change in target change in rf -- steps
Jan 14 2011 12:59:50:440PM	1110114016	Bill Rowan	016. Plasma full length 2 small h-modes Next shot Bt=3.8 T (105700 A)
Jan 14 2011 01:15:38:933PM	1110114017	Bill Rowan	017. Plasma full length BT=3.9T one small h-mode next shot cell access for RF extended nl_04 to 1.5 s BT increased to 3.9T (108600A)
Jan 14 2011 01:31:01:690PM	1110114018	Bill Rowan	018. Plasma full length multiple h-modes BT=4.0 T Next shot nl_04 = 0.78e+20 also decreased the rate of fall during rampdown
Jan 14 2011 01:49:27:320PM	1110114019	Bill Rowan	019. plasma full length multiple h-modes next shot BT to 4.5 T (125300A) IP = 0.9 DNB 0ff for MSE
Jan 14 2011 01:58:21:420PM	1110114020	Bill Rowan	020. DNB off IP = 0.9 MA BT = 4.6 T multiple h-modes next shot DNB 0n No PCS changes Same target
Jan 14 2011 02:17:19:117PM	1110114021	Bill Rowan	021 DNB on multiple h-modes Next shot. reload 1110114001 BT = 5.2 T IP = 1.0MA nl_04 = 0.3e+20 returned PG1 (argon) to 45 ms pulse beginning at 0.3 s
Jan 14 2011 02:37:32:570PM	1110114022	Bill Rowan	022. disruption at 0.46 s injection or locked mode Next shot. Increase nl_04 demand to 0.4e+20
Jan 14 2011 02:43:26:247PM	1110114023	Bill Rowan	023. plasma full length tci data stops at 1.13 s Next shot. decrease nl_04 demand to 0.35e+20 no other changes
Jan 14 2011 02:54:29:720PM	1110114024	Bill Rowan	024. disruption at 0.61 Next shot increase nl_04 demand to 0.4e+20
Jan 14 2011 03:12:02:260PM	1110114025	Bill Rowan	025. plasma full length multiple h-modes next shot No pcs changes
Jan 14 2011 03:23:34:077PM	1110114026	Bill Rowan	026. plasma full length next shot no beam increase nl_04 demand to 0.42e+20
Jan 14 2011 03:49:08:313PM	1110114028	Bill Rowan	028. plasma full length BT = 4.6 T IP=0.9 MA nl_04 = 0.4e+20 Next shot. No pcs changes
Jan 14 2011 04:38:49:030PM	1110114029	Bill Rowan	029. plasma disrupted at 0.4 s appear to be locked modes again next shot increase nl_04 slightly
Jan 17 2011 12:19:55:080PM	1110114030	Bill Rowan	030. dud, EF1U early communtation ratiomatic off next shot turned ratiomatic on ef4 changed from -1300 to -1280 startup was copied from 1110113035 returning ef4 to setting used for many shots prior to 1110113035
Jan 14 2011 04:35:43:243PM	1110114031	Bill Rowan	031. fizzle Next shot reloaded 1110104029 increased nl_04 to 0.44e+20
Jan 17 2011 12:22:31:197PM	1110114033	Bill Rowan	033. disruption at 0.5 s next shot pg3 back porch 35 to 55 add 2 ms to prefill gas changes based on perception that the locked mode is only the last in a series of problems which may originate with a hollow profile that develops in ramp-up. BT = 3.9T IP = 0.8 MA
Jan 14 2011 05:06:36:867PM	1110114034	Bill Rowan	034. plasma full length final shot

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:00:46:667AM	Plasma	Ok
2	09:17:12:280AM	Plasma	Ok
3	09:34:49:300AM	Plasma	Ok
4	09:47:30:593AM	Plasma	Ok
5	10:01:23:417AM	Plasma	Ok
6	10:14:31:570AM	Plasma	Ok
7	10:27:36:910AM	Plasma	Ok
8	10:42:59:917AM	Plasma	Ok
9	10:56:40:047AM	Plasma	Ok
10	11:11:05:720AM	Plasma	Ok
11	11:25:22:430AM	Plasma	Ok
12	11:38:04:000AM	Plasma	Ok
13	12:09:22:773PM	Plasma	Ok
14	12:26:37:727PM	Plasma	Ok
15	12:39:01:220PM	Plasma	Ok
16	12:51:44:920PM	Plasma	Ok
17	01:06:34:043PM	Plasma	Ok
18	01:21:49:637PM	Plasma	Ok
19	01:36:46:777PM	Plasma	Ok
20	01:53:00:527PM	Plasma	Ok
21	02:07:27:883PM	Plasma	Ok
22	02:21:15:833PM	Plasma	Ok
23	02:35:09:260PM	Plasma	Ok
24	02:48:04:047PM	Plasma	Ok
25	03:03:17:397PM	Plasma	Ok
26	03:15:59:370PM	Plasma	Ok
27	03:28:39:920PM	Plasma	Ok
28	03:42:06:147PM	Plasma	Ok
29	03:54:51:230PM	Plasma	Ok
30	04:07:21:653PM	Plasma	Bad
31	04:19:51:283PM	Plasma	Ok
32	04:38:52:020PM	Plasma	Ok
33	04:51:31:840PM	Plasma	Ok
34	05:04:01:220PM	Plasma	Ok

System Availability

Jan 14 2011 09:00:31:777AM

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 sears,snipes BES yes BES system is online Oct 21 2010 11:33AM (bespam) Bill Rowan Beam Emission Spectroscopy bespam,liao,rowan Bolometers yes 2pi (D+F) working. All midplane and off-midplane diode arrays working except WB1AX. Midplane foils calibrated and PRAD_MAIN is being filled. Divertor/Ledge foils not yet ready. Jul 15 2010 08:27AM (mlreinke) Matt Reinke Bolometers hutch,mlreinke Boronization yes   Nov 16 2010 02:36PM (dekow) Jim Irby Boronization dekow,irby CNPA yes Multiple channel CNPA available Oct 21 2010 07:11PM (parker) Ron Parker Compact Neutral Analyzer parker Cryopump - Upper Divertor no Shut down. Helium dewar removed. LN2 manual valve and solenoid valves are closed and tagged. Apr 06 2010 10:51AM (labombard) Brian LaBombard Upper Divertor Cryopump irby,labombard CXRS yes Wide-view CXRS system is online Oct 21 2010 11:33AM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,liao,rachmcd,rowan 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 yes system is aligned; new calibrations (relative brightness and position) not yet implemented Jun 29 2010 10:27AM (marmar) Earl Marmar Visible Bremsstrahlung marmar Disruption Mitigation yes operational, but turned off Nov 03 2009 04:59PM (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 DNB no in test mode only Nov 03 2009 05:01PM (granetz) Robert Granetz Diagnostic Neutral Beam dterry,granetz,gung ECDC yes Operational Jun 26 2010 09:28PM (irby) Jim Irby 2.45 GHz, 3 kW, discharge cleaning system dekow,irby,pfeiffer FRC-ECE yes All channels working and calibrated. Oct 27 2010 03:41PM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips G-Side Ratiomatic yes Gauges are operational. Jun 28 2010 08:02PM (labombard) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland Glow Discharge no Plugs for Power Supply and Controls have been unplugged and red tagged making system safe for In-Vessel Access. Apr 05 2010 11:18AM (dekow) Jim Irby 1 kV, 5 A, glow discharge system dekow,dterry,irby GPC yes Operational. Jul 28 2009 04:23PM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt GPC2 yes Most channels operational. Oct 22 2010 11:46AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt 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 operating normally Jun 29 2010 10:26AM (marmar) Earl Marmar H/D Ratio marmar HEAT yes   Jun 26 2010 11:19PM (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 System installed and aligned. Inverted Profiles for Ti are available upon request. Vtor profiles still under revision. Dec 17 2010 09:25AM (ypodpaly) John Rice High Resolution X-Ray ince,rice,ypodpaly HXR yes 32 Channels operational Oct 23 2010 01:41PM (parker) Ron Parker Hard X-Ray Array faust,parker,schmidt ICRF D-Antenna yes system checked out ok on 11006728. Jun 28 2010 04:57PM (ylin) Steve Wukitch D-port antenna wukitch,ylin ICRF E-Antenna yes system checked out ok on 1100628 Jun 28 2010 04:57PM (ylin) Steve Wukitch E-port antenna wukitch,ylin ICRF J-Antenna yes system checked out ok. conditioned to vacuum. Jun 28 2010 04:58PM (ylin) Steve Wukitch J-port antenna wukitch,ylin Laser Blow-Off yes operational and tested Jul 20 2010 04:42PM (g) Martin Greenwald Impurity Injection System g,nthoward Lower Hybrid yes LH working. New directional couplers installed at input to each klystron. Oct 21 2010 11:42AM (dterry) Ron Parker Lower Hybrid dterry,parker,wallaceg Lower Hybrid Reflectometer yes 50GHz: up-, 60 GHz up- and down- Oct 21 2010 11:31AM (sgbaek) Arturo Dominguez Lower Hybrid Reflectometer dominguez,marmar,parker,sgbaek Lower Hybrid SOL reflectometer yes differential phase (profile) working since 8/27/2010. full phase (fluctuations + profile) is not. If put on a miniproposal, please request LH launcher to be moved in Oct 05 2010 11:26AM (cornwall) Cornwall Lau Lower Hybrid SOL reflectometer cornwall,wukitch,ylin LPI no Beam line removed May 30 2008 02:09PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar Ly-alpha no WB4LY and LLY working but not during ICRF. WB1LY not attached due to pickup problems. LYMID attached but have profile problems. Aug 24 2010 09:17AM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke McPherson yes Spectra being collected and tree filled. Wavelength scan is broken so fixed on the Mo XXXI and XXXII lines. Jul 15 2010 08:28AM (mlreinke) Jim Terry VUV Spectrometer mlreinke,terry Michelson yes Operational. Oct 22 2010 11:46AM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt MKS yes Gauges are operational Jun 28 2010 08:02PM (labombard) Brian LaBombard Baratron pressure gauges labombard 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 As of 6/10/09, MSE is calibrated & ready to go. Awaiting DNB. Jun 10 2009 10:34AM (sscott) Steve Scott Motional Stark Effect jinseok,sscott Neutrons yes All systems are on and functional Jun 29 2010 12:56PM (fiore) Catherine Fiore Neutron Detectors fiore Neuts and Hards yes PMT Neuts_hards, ssd_x01, ssd_x02, ssd_x03 Jun 26 2010 09:21PM (irby) Jim Irby X-Ray/Neutron Detectors at K-Hor irby NINJA no Capillaries tested in-vessel. Jun 28 2010 08:08PM (labombard) Brian LaBombard NINJA gas puff labombard,terry PCI yes Operational. AM (2 * 39.51) MHz. Dec 13 2010 05:29PM (ntsujii) Miklos Porkolab Phase Contrast Imaging ennever,ntsujii,porkolab Penning Gauges no High voltage power supplies are turned off, waiting for work at A-port horizontal to be finished. Jun 28 2010 08:07PM (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 no Safe for Machine Entry Sep 14 2007 12:17PM (irby) Jim Irby C-Mod Polarimeter irby Power - Alternator Air Switch yes   Jun 26 2010 11:19PM (dekow) Gary Dekow feeds all the other supplies cochran,dekow,dterry,irby Power - PEI yes   Jun 26 2010 11:19PM (dekow) Gary Dekow PEI System cochran,dekow,dterry,irby Power - TMX yes   Jun 26 2010 11:19PM (dekow) Gary Dekow Ef2s,. EFCs and A-Coils byford,cochran,dekow,dterry,irby Power Systems yes   Jun 26 2010 11:20PM (dekow) Jim Irby C-Mod Magnet Supplies byford,cochran,dekow,dterry,irby Probe Array - ISD yes Operational. Jun 28 2010 08:03PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard Probe Array - LH yes Operational. Jun 28 2010 08:03PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard Probe Array - OSD yes F and J outer divertor probes are operational. Jun 28 2010 08:04PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard Probe Array - UDIV yes Operational, except probe#13 Jun 28 2010 08:04PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard Reflectometer yes As of 1101123, the 60, 88u, 88l, 140 and variable set at 115GHz are operational. The 50, 75 and 112 are nonoperational. On 1101123, the noise band at ~200kHz is again seen on the 88u and 88l channels. Nov 23 2010 09:30AM (dominguez) Earl Marmar Reflectometer dominguez,marmar Scanning Probe - ASP yes Operational. New Langmuir-Mach probe head installed. Jun 28 2010 08:05PM (labombard) Brian LaBombard A-Port Scanning Probe labombard Scanning Probe - FSP yes Operational. Jun 28 2010 08:05PM (labombard) Brian LaBombard F-Port Scanning Probe labombard Scanning Probe - WASP yes Both A and K units are operational. Coil polarity needs to be checked. Jun 28 2010 08:06PM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick Sparker yes HV supply on, cable run to sparker at k-hor Jun 23 2010 02:41PM (irby) Jim Irby Field Emission Preionization for C-Mod dekow,irby,parkin Surface Science Station yes SSS installed and leak tested. Oct 21 2010 11:31AM (ochoukov) Bruce Lipschultz Radially scanning probe located on K-port blip,ochoukov TCI yes No new CO2 detector, so still missing edge channels Jun 23 2010 02:40PM (irby) Jim Irby Two-Color Interferometer irby,murray TS - Core yes Operating with 2 lasers Oct 22 2010 01:06PM (jwhughes) Jerry Hughes Core Thomson scattering jwhughes,yma TS - Edge yes Operational Jul 14 2010 11:54AM (jwhughes) Jerry Hughes Millimeter resolution edge Thomson scattering jwhughes,yma Vispec no 350 and 670 nm, 4 spatial channels Nov 28 2007 09:58AM (agraf) Alex Graf Visible Spectrometer agraf XEUS no 1/3/11 - turbo pump failure, offline until repaired. Raw spectra stored but not line brightness time histories are going into the tree yet. Jan 03 2011 12:52PM (mlreinke) Matt Reinke X-ray Extended Ultraviolet Spectrometer mlreinke XTOMO yes Core system working. Edge system waiting for H-modes. Jul 01 2010 11:55AM (mlreinke) Bob Granetz X-Ray Tomography granetz,mlreinke