| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | John Rice |
| Physics operator(s): | John Goetz |
| Engineering operator(s): | Frank Silva |
| Engineering Operator Run Comment |
| MP#237 |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:20:337PM |
| Author: To Be Determined |
| Run summary for 990423, MP237, Toroidal Rotation during Plasma Current Scan The purpose of this run was to determine the scaling of the rotation velocity with plasma current, for otherwise constant target plasmas, for H-mode discharges. The range of currents achieved was from 0.4 to 1.4 MA, however the quality of the H-modes erratic, rendering the results of this scan nebulous. Other extraneous results were obtained, including some edge temperature pedestal profiles in H-mode at high current and impurity confinement scalings with plasma current. Further analysis of the rotation velocities will be forthcoming. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:00:990PM |
| Author: To Be Determined |
| Physics operator summary for 990423 EO: Silva PO: Goetz SL: Rice Run 990423 was in support of Mini-Proposal #237: Scaling of Rotation with Ip. This run will attempt to confirm/quantify/characterize the scaling of the toroidal rotation velocity with plasma current during ICRF heating. The run today was not a success due to the difficulty of producing high quality H-modes. See the session leader's summary for an in depth discussion of the experiments performed. The run started off with fizzles on two of the first four shots. After that, it was nothing but plasmas. The first fizzle was due to too much radial field. The second fizzle may have been from the post-boronization blues. For most of the beginning of the run, there were current rise hesitations and the plasma would not "pump-out" the midplane neutral pressure. As the day went on, the breakdown became more "normal" and good plasmas were produced throughout. However, good quality H-modes were difficult to obtain today. The plasma current was scanned from 0.4 to 1.3MA during the run. Changes were made to EF4, RCUR, and CLEARIN to compensate for the IP change. EF4 was increased/decreased in tandem with IP. RCUR and CLEARIN were pushed to the plasma center as the current was raised. At the highest current of 1.4MA, an early disruption occured. The only supply that looked like it was on the rail was EF4. The PLC current limit was raised and the EF4 and IP currents were lowered slightly. Subsequent plasmas survived, although the EF4 was very close to its current limit. The majority of plasmas lasted until 1.7s when the power supplies were turned off. Engineering, computing, and diagnostics today: Two instances of cell access for TCI laser power problems. There is a leak in the J-Bottom piezoelectric valve [ 2psi of Kr caused a 3e-8 partial pressure in the torus ]. The RF cabal had another tough day with arcing and what-not. Scorecard: 28 shots = 26 plasmas + 2 fizzles + 0 duds + 0 tests Shot summary for Run 990423: Load 990421006 controller for NL04 returned to PG3 in segment 2 copy V_PG5 to V_PG3 in segment 2 coldstart hybrid - everything loaded; all matrices respond Shot change result ____ _____ ______ 1 see above fizzle; weak one; b.d. @ .006; Br=+.001 P0=.044mTorr 2 BR_0=.001; PG4=18ms plasma; b.d. @ .005; hesitation @.013 from a bounce 3 no changes plasma; b.d. @ .005; good current rise disr. @ 1.63 4 7.5kA Bt wiggle @ 0.75 fizzle; b.d. @ .005; bounces off something @ .015 5 BR_0=.00125; PG4=19ms plasma; b.d. @ .005; bounces @ .015 rubs on something @ 0.8s 6 PG4=20ms; Bt wiggles to 0.95s plasma; b.d. @ .005; nice current rise ZCUR=-.005; 30ms x 100V @ 0.3s on PG2 with 6 PSI H2 7 IP = -580000 plasma; b.d. @ .005; nice current rise disrupts @ .79; kappa=1.65 8 CLEARIN=-.01; TF wiggles to plasma; b.d. @ .004; nice current rise 0.85s kappa=1.65 9 RCUR=.671 plasma; b.d. @ .005; o.k. current rise outer gap = 1cm 10 RCUR=.673; CLEARIN=-.012 plasma; b.d. @ .005; nice current rise outer gap = .7cm; kappa ~ 1.62 11 IP=-390000; EF4=2600 in seg 2; plasma; b.d. @ .005; o.k. current rise; PG3=60V in seg 1 disrupts @ 0.33; kappa = 1.69; n/n_crit = 1.3 12 PG2=50ms; CLEARIN=-.018; plasma; b.d. @ .005; o.k. current rise; slow down ZXL ramp; mover RCUR disrupts @ 1.34; o.gap=1cm; kappa=1.6 out earlier; slow down IP ramp to 0.4MA 13 RCUR=.674; slow down IP ramp plasma; b.d. @ .005; o.k. current rise; disrupts @ 1.34; gaps jumping around 14 IP=-490000; EF4=2800 in seg 2 plasma; b.d. @ .005; good current rise; disrupts @ 1.34; antenna injects something @ 0.74s 15 no changes plasma; b.d. @ .005; good current rise; no big injections 16 IP=-780000; CLEARIN=-.014; plasma; good startup; no injections RCUR=.672; EF4=3000A in seg2; less PG3 in seg 1 17 IP=-970000; CLEARIN=-.01; plasma; good startup; o.gap=0.6; RCUR=.669; EF4=3200A in seg2; i.gap=1.0; kappa=1.64; disrupts @ 1.39 18 CLEARIN=-.007 plasma; good startup; o.gap=0.7; i.gap=1.2; kappa=1.64; disrupts @ 1.70 19 no changes plasma; good startup; just like 018 20 IP = -1196000; EF4 = 3400A; plasma; Ip=-1.2MA; disrupts @ 1.71; RCUR = 0.668; CLEARIN = -.005 good startup 21 no changes plasma; good startup; looks like 020 22 no changes plasma; good startup; looks like 021 23 IP = -1385000; EF4 = 3700A; plasma; startup hesitation; disrupts RCUR = .667; CLEARIN = -.0025 at 0.67 because out of EF4 24 IP=-1300000; EF4=3550A; plasma; disrupts @ 1.31; big hesitation; increase EF4 PLC limit to -8500 EF4 right at the limit 25 EF4=3500A; BR_0=.0015; more plasma; no hesitation; disrupts @ 1.71 PG3 in segment 1 26 no changes plasma; slight hesitation; disrupts @ 1.33s; 27 no changes plasma; no hesitation; disrupts @ 1.71 28 no changes plasma; no hesitation; disrupts @ 1.71 |
| Session Leader Comments | |||
| Apr 23 1999 09:06:25:263AM | 990423003 | Ian Hutchinson | Used @SYS$MANAGER:FAST_CONTROL to set fast magnetics window to .5s start with length .5s. |
| Apr 23 1999 09:37:15:200AM | 990423005 | Ian Hutchinson | Something was wrong with the previous fast_control. So do the same thing again. |
| Physics Operator Comments | |||
| Apr 23 1999 07:54:13:060AM | John Goetz | Engineering Setup and Run plan for Friday, 990423: MP 237 Scaling of Rotation with Ip Engineering Setup for 990423 Power supplies as for 990421006 Helium ECDC after overnight boronization TF under hybrid control Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid enabled fill C-side with 30 psi of D2 Hybrid enabled fill J-bottom with 2 psi of Kr Hybrid disabled The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV, IMP INJ Physics setup This run will attempt to confirm/quantify/characterize the scaling of the toroidal rotation velocity with plasma current during ICRF heating. There will be a roughly constant density current scan of [.8,.6,.5,.4,.8,1,1.2,1.4,.8]MA performed with about 2.5MW of injected RF power and 5.4T toroidal field with ECE tweaks. | |
| Apr 23 1999 08:26:13:467AM | 990423001 | John Goetz | Shot 990423001 coldstart hybrid - all matrices respond load 990421006 with: controller for NL04 returned to PG3 in segment 2 copy V_PG5 to V_PG3 in segment 2 Results fizzle; weak one; break down @ .006 BR_0 = .001 fill pressure is low compared to 990421006 |
| Apr 23 1999 08:41:45:123AM | 990423002 | John Goetz | Shot 990423002 BR_0 = .001 (was .002) PG4 = 18ms (was 16ms) Results plasma; disrupts @ 1.6 breakdown @ .005; Br ~ 0; bounces off something @ .013 for a serious hesitation antenna outgassing? H-mode late |
| Apr 23 1999 08:58:36:077AM | 990423003 | John Goetz | Shot 990423003 no changes Results plasma; disrupts @ 1.63 breakdown @ .005; Br ~ 0; hesitation is gone H-mode at the normal time |
| Apr 23 1999 09:27:33:390AM | 990423004 | John Goetz | Shot 990423004 add 7.5kA wiggle to Bt @ 0.75s Results fizzle breakdown @ .005; bounces @ .015, doesn't survive the bounce |
| Apr 23 1999 09:45:30:843AM | 990423005 | John Goetz | Shot 990423005 BR_0 = .00125 PG4 = 19ms Results plasma breakdown @ .005; bounces @ .015, survives the bounce rubs on something @ 0.8s; or something drips in |
| Apr 23 1999 10:02:19:280AM | 990423006 | John Goetz | Shot 990423006 move Bt wiggles to 0.95s PG4 = 20ms ZCUR = -.005 (was -.01) 30ms x 100V on PG2 @ 0.3s in segment 2 (plenum has 6 PSI hydrogen) Results plasma - disrupts @ 0.63 breakdown @ .005; no bounce - nice current rise |
| Apr 23 1999 10:17:39:340AM | 990423007 | John Goetz | Shot 990423007 IP = -580000 Results plasma - disrupts @ 0.79 this one was in trouble at the beginning of the RF pulse kappa of about 1.65 breakdown @ .005; no bounce - nice current rise |
| Apr 23 1999 10:34:45:060AM | 990423008 | John Goetz | Shot 990423008 CLEARIN = -.01 (was -.008) move TF wiggles to 0.85s Results plasma - disrupts @ 1.6 breakdown @ .005; no bounce - nice current rise - Br(0) ~ -.001 kappa still about 1.65 but this one makes it through |
| Apr 23 1999 10:52:45:687AM | 990423009 | John Goetz | Shot 990423009 RCUR = .671 (outer gap was 1.4cm) Results plasma - disrupts @ 1.6 breakdown @ .005; no bounce - nice current rise - Br(0) ~ -.001 outer gap now 1.0s - RF notices no difference - kappa ~ 1.65 |
| Apr 23 1999 11:05:09:437AM | 990423010 | John Goetz | Shot 990423010 RCUR = .673 and CLEARIN = -.012 more PG3 in segment 1 to slow down current ramp rate Results plasma - disrupts @ 1.58 breakdown @ .005; nice current rise outer gap now 0.67cm - RF notices no difference - kappa ~ 1.62 current ramp rate unchanged |
| Apr 23 1999 11:27:12:437AM | 990423011 | John Goetz | Shot 990423011 IP = -390000 EF4 = 2600A in segment 2 PG3 60V in segment 1 Results plasma - disrupts @ 0.33 breakdown @ .005; nice current rise kappa ~ 1.69 n / n_crit = 1.3 - a little vertical instability |
| Apr 23 1999 11:47:44:437AM | 990423012 | John Goetz | Shot 990423012 move RCUR out earlier slow down initial ZXL ramp PG2 = 50ms x 100V @ 0.3s CLEARIN = -.018 slow down IP ramp down to 0.4MA Results plasma - disrupts @ 1.33 breakdown @ .005; nice current rise kappa ~ 1.60 n / n_crit = 1.3 - a little vertical instability, then n / n_crit = 1.0 poloidal detachment from 0.5 to 0.6s Mo injection 0.9 heated well, but no H-mode? |
| Apr 23 1999 12:05:50:530PM | 990423013 | John Goetz | Shot 990423013 RCUR = 0.674 slow down IP ramp down to 0.4MA Results plasma - disrupts @ 1.33 breakdown @ .005; nice current rise kappa ~ 1.60 poloidal detachment from 0.5 to 0.6s heated well, but no H-mode looks a lot like 012 |
| Apr 23 1999 12:26:24:937PM | 990423014 | John Goetz | Shot 990423014 IP = -490000 EF4 = 2800A in segment 2 less PG3 early in segment 2 Results plasma - disrupts @ 1.33 breakdown @ .005; nice current rise large injection emanating from the antenna; possibly some boron |
| Apr 23 1999 12:48:46:747PM | 990423015 | John Goetz | Shot 990423015 no changes Results plasma - disrupts @ 1.36 breakdown @ .005; nice current rise no big injections, no H-mode slight cross-over bump @ 0.76 |
| Apr 23 1999 01:07:47:310PM | 990423016 | John Goetz | Shot 990423016 IP = -780000 CLEARIN = -.014 RCUR = .672 EF4 = 3000A in segment 2 less PG3 in segment 1 Results plasma - disrupts @ 1.36 breakdown @ .005; nice current rise a lot better with the RF this time outer gap to zero late in time |
| Apr 23 1999 01:23:00:810PM | 990423017 | John Goetz | Shot 990423017 IP = -970000 CLEARIN = -.01 RCUR = .669 EF4 = 3200A in segment 2 Results plasma - disrupts @ 1.39 breakdown @ .005; nice current rise outer gap = 0.6cm; inner gap = 1.0cm; kappa = 1.64 |
| Apr 23 1999 01:42:21:937PM | 990423018 | John Goetz | Shot 990423018 CLEARIN = -.007 slow down current in ramp-down [ it was still set for a 0.4MA shot] Results plasma - disrupts @ 1.71; fixed with the drawn IP waveform breakdown @ .005; nice current rise outer gap = 0.7cm; inner gap = 1.2cm and flat; kappa = 1.64 |
| Apr 23 1999 02:02:06:247PM | 990423019 | John Goetz | Shot 990423019 no changes Results plasma - disrupts @ 1.71 breakdown @ .005; nice current rise same as 018 |
| Apr 23 1999 02:20:00:420PM | 990423020 | John Goetz | Shot 990423020 IP = -1196000 EF4 = 3400A RCUR = 0.668 CLEARIN = -.005 Results plasma - Ip = -1.2MA - disrupts @ 1.71 breakdown @ .005; nice current rise outer gap = 0.6cm; inner gap = 1.3cm; kappa = 1.69 |
| Apr 23 1999 02:36:25:123PM | 990423021 | John Goetz | Shot 990423021 no changes Results plasma - disrupts @ 1.71 breakdown @ .005; nice current rise looks a lot like 020 |
| Apr 23 1999 02:53:16:293PM | 990423022 | John Goetz | Shot 990423022 no changes Results plasma - disrupts @ 1.71 breakdown @ .005; nice current rise looks a lot like 021 |
| Apr 23 1999 03:34:09:140PM | 990423023 | John Goetz | Shot 990423023 IP = -1385000 EF4 = 3700A RCUR = .667 CLEARIN = -.0025 Results plasma - disrupts @ 0.67 breakdown @ .005; slight hesitation on this one it appears that EF4 is near the PLC limit ( it also appears that the 1.5MA shot of 960904038 was also a victim of the EF4 current limit ) benign disruption according to RSG |
| Apr 23 1999 03:58:09:497PM | 990423024 | John Goetz | Shot 990423024 IP = -1300000 EF4 = 3550A increase EF4 PLC limit to -8500A Results plasma - -1.3MA - disrupts @ 1.31 breakdown @ .006; big hesitation on this one EF4 is around 4kA and oscillating; still near the limit |
| Apr 23 1999 04:09:11:543PM | 990423025 | John Goetz | Shot 990423025 BR_0 = .0015 more PG3 in segment 1 EF4 = 3500A Results plasma - disrupts @ 1.7 breakdown @ .005; no hesitation on this one EF4 is around 4kA and oscillating; still near the limit outer gap = 1cm; inner gap = 1.4cm; kappa=1.7 |
| Apr 23 1999 04:31:44:187PM | 990423026 | John Goetz | Shot 990423026 no changes Results plasma - disrupts @ 1.36 breakdown @ .005; slight hesitation on this one looks a lot like 024 |
| Apr 23 1999 04:49:01:937PM | 990423027 | John Goetz | Shot 990423027 no changes Results plasma - disrupts @ 1.71 breakdown @ .005; no hesitation on this one looks a lot like 025 |
| Apr 23 1999 04:59:48:890PM | 990423028 | John Goetz | Shot 990423028 no changes Results plasma - disrupts @ 1.71 breakdown @ .005; no hesitation on this one looks a lot like 027 |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:15:49:187AM | Plasma | Ok | no faults/fizzel |
| 2 | 08:28:24:263AM | Plasma | Ok | no faults/plasma |
| 3 | 08:44:28:873AM | Plasma | Ok | no faults/plasma |
| 4 | 09:15:04:403AM | Plasma | Ok | no faults/plasma |
| 5 | 09:28:05:233AM | Plasma | Ok | no faults/plasma |
| 6 | 09:46:26:250AM | Plasma | Ok | no faults/plasma |
| 7 | 10:07:35:280AM | Plasma | Ok | no faults/disruption |
| 8 | 10:24:16:403AM | Plasma | Ok | no faults/plasma |
| 9 | 10:40:19:873AM | Plasma | Ok | no faults/plasma |
| 10 | 10:58:54:840AM | Plasma | Ok | no faults/plasma |
| 11 | 11:17:13:327AM | Plasma | Ok | no faults/disruption |
| 12 | 11:32:45:077AM | Plasma | Ok | no faults/plasma |
| 13 | 11:51:42:903AM | Plasma | Ok | no faults/plasma |
| 14 | 12:08:52:873PM | Plasma | Ok | No Faults |
| 15 | 12:36:40:310PM | Plasma | Ok | No Faults |
| 16 | 12:56:32:263PM | Plasma | Ok | No Faults |
| 17 | 01:16:00:030PM | Plasma | Ok | No Faults |
| 18 | 01:32:40:623PM | Plasma | Ok | No Faults |
| 19 | 01:52:49:530PM | Plasma | Ok | No Faults |
| 20 | 02:11:39:733PM | Plasma | Ok | No Faults |
| 21 | 02:30:01:233PM | Plasma | Ok | No Faults |
| 22 | 02:47:41:640PM | Plasma | Ok | No Faults |
| 23 | 03:07:08:873PM | Plasma | Ok | No Faults |
| 24 | 03:41:41:310PM | Plasma | Ok | No Faults |
| 25 | 04:00:06:093PM | Plasma | Ok | No Faults |
| 26 | 04:16:24:700PM | Plasma | Ok | No Faults |
| 27 | 04:40:54:153PM | Plasma | Ok | No Faults |
| 28 | 04:56:17:700PM | Plasma | Ok | No Faults |