| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Martin Greenwald,Jerry Hughes |
| Physics operator(s): | Earl Marmar |
| Engineering operator(s): | Unknown |
| Engineering Operator Run Comment |
| MP385 Edge Rotation and L/H Threshold; MP396 Edge pedestal; SL:Greenwald |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:05:867PM |
| Author: Martin Greenwald |
| Run Summary for 1040507 MP 385 Edge rotation and the L/H threshold - dependence on known scaling parameters Session Leader - Greenwald Phys Op - Marmar Background: Recent work has revealed a connection between self-generated core and SOL flows, topology and the L/H threshold For the conditions studied, 0.8 MA, 5.4 T and 1.2-1.6 x 10$^{20}$, the transition occurs when core toroidal rotation reaches about 0 for USN, LSN and DN plasmas. To make a connection to the broader issues of the L/H threshold, we would like to determine if this picture holds for other plasma conditions and particularly to measure dependence on parameters which are known to be important for the L/H power threshold, namely n and B. Scanning B requires running RF at lower frequency. Plan: Start with 1040506023 and get a decent H-mode. The RF pulse starts at the beginning of the TF flat-top ~ 0.8 sec. RF at 50 MHz. 1. with this plasma topology (strongly lower null) lower power systematically and find threshold - measure evolution of core rotation. 2. RF to max power (about 1.4 MW at 50 MHz - J4 only). Then scan ssep up to find H-mode threshold. Results: After some conditioning, we nailed down both thresholds. Given the power limitation though, we weren't able to go much past double null. In lower null the power threshold was with Prf between 0.5 and 0.6 MW. Ohmic power was about 0.5 MW.Rotation was slightly counter - but less than -10 km/s - before RF. Little change was observed with RF. Increased to about +20 km/s during H-mode. For 1.4 MW the threshold occurred with ssep between +1 and +2 mm. Though small, this difference gave repeatable results,.indicating how sensitive the threshold is to the topology. With this geometry, vphi was -20 km/sec in target plasma. Rotation increased with RF and was slightly co at the time of transition. Shots for further analysis: Shot Prf ssep nebar H-modes 01 1.15 -25mm 1.1 yes 02 1.14 -25 1.1 yes 03 1,12 -25 1.1 yes 04 1.17 -26 1.1 yes 05 1.15 -25 1.1 yes 06 1.15 -25 1.1 yes 07 1.15 -25 1.0 yes 08 0.95 -25 0.95 yes 09 0.75 -25 0.97 yes 11 0.63 -22 0.88 yes 12 0.53 -25 0.9 no 13 1.10 +01.6 0.84 yes 14 1.10 +03 0.75 no 15 1.10 +03.5 0.8 no 16 1.4 +03,5 0.8 no 17 1.4 +01.5 0.8 no 18 1.4 +01 0.8 yes ! |
| Entered: Jul 7 2004 03:49:05:880PM |
| Author: Jerry Hughes |
| Session Leader's Run Summary for 1040507B: MP396: "Edge Pedestal Scaling at lower B" PO: E. Marmar SL: J. Hughes BACKGROUND: This run was intended to examine the scalings of H-mode pedestal parameters, and the associated H-mode regimes, at fields lower than those routinely exploited on Alcator C-Mod. Previous data analysis performed on EDA H-modes had suggested a trend toward wider n_e pedestals as Bt (or possibly q95) was lowered. The tuning of the J-port antenna to 50MHz allowed for near-axis D-H minority heating at fields from 2.9--3.8T, while 80MHz ICRF could still be used in the 4.6--6.0T range. Using both sets of antennae, we potentially could compare discharges differing by a factor of 2 in Bt using identical auxiliary heating mechanisms. At each field, current should be varied, giving values of q95 from approximately 3 to 9. PLAN: Begin with 2.8T and 3.4T shots established both during run 1040506 (MP370) and 1040507A. Fill in Bt/Ip phase space with as many of the data points called for in the mini-proposal as time will allow: Bt=3.4T, Ip=0.5,0.8MA Bt=2.9T, Ip=0.5,0.8MA Bt=3.8T, Ip=0.5,0.8MA Bt=5.3T, Ip=0.5,0.8,1.2MA Bt=6.0T, Ip=0.5,0.8,1.2MA Bt=4.6T, Ip=0.5,0.8,1.2MA RESULTS: RF power was restricted today, due to technical problems with D-port and the J3 transmitter. However, we were able to routinely obtain between 1 and 1.5MW from either E-port or J4. Because of a reasonable rep rate and 100% machine and RF reliability, a number of H-modes, and accompanying edge Thomson profiles, were obtained over a wide range of conditions, with Bt ranging from 3.0 to 5.3T and Ip from 0.5 to 1.2MA. D-H minority heating was accomplished with J4 at fields below 4.5T, and with E-port at fields above. E-port tripped badly at high Bt and low Ip (a feature which Y. Lin knew about from previous scans), and appeared to heat less effectively than J-port operating at similar power levels with a D-He3 resonance (see shot 034, where both E and J fire, but only J triggers an H-mode). A number of H-modes were ohmic, a result of the lower fields and often high currents. H-modes typically were short and ELM-free (though some showed a faint QC mode on PCI), even at higher q. This is perhaps due to relatively low pedestal densities. Because the H-modes were short, the Thomson data are sparser than desired, making for dicier analysis. It is also not clear how these largely non-EDA data are expected to compare with scalings previously established for EDA H-modes. As for observable trends, density pedestals tended to increase with plasma current, to the surprise of no one, and at lower Ip, the n_e gradient tends to be smaller. Differences in profile characteristics due to Bt are harder to pick out without first doing a systematic analysis of the data collected. At first glance it appears that the density pedestal was not significantly widened by moving to lower field (or safety factor), but a definite conclusion awaits further analysis. A detailed shot log follows. Much thanks to Earl Marmar for his expert operation of the machine, and to Yijun Lin for providing reliable RF. ______________________________________________ Shots with H-modes are marked with asterisks: H SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) * 019 3.4 0.5 5.2 1.25 0.0 * 020 3.4 0.8 3.2 1.25 0.0 * 021 3.4 0.8 3.2 1.25 0.0 * 022 3.8 0.8 3.7 1.25 0.0 * 023 3.8 0.8 3.7 1.25 0.0 * 024 3.8 0.5 5.9 1.25 0.0 * 025 4.0 0.5 6.1 1.25 0.0 * 026 3.0 0.8 2.9 1.25 0.0 * 027 3.0 0.5 4.7 1.25 0.0 * 028 5.3 0.8 5.0 0.0 1.3 029 5.3 0.5 7.7 0.0 1.25 030 5.3 0.5 7.8 1.3 1.3 031 5.3 0.5 7.9 1.35 1.25 * 032 5.3 1.2 3.5 1.45 1.05 033 4.6 1.2 2.9 1.35 0.0 * 034 4.6 0.8 4.4 1.2 1.4 * 035 4.6 0.5 7.0 1.2 1.45 * 036 4.6 1.2 3.1 1.0 1.45 019: Repeat of 12, with higher RF power. RF good and steady. H-modes, decent pedestal data. 020: Ip to 0.8MA. RF good and steady. Repeat for more TS data. 021: Repeat of 020. RF good and steady. 022: Good. Raise the target density slightly on next shot and see whether that affects L-H transition time or H-mode quality. 023: Raising the target density seemed to help. H-mode followed soon upon RF turn-on, without the wait for the initial slow density rise. 024: Lots of short ELM-free H-modes. Decent pedestal data. 025: Tweak field slightly for JR and look for an ITB with RF resonance on low-field side. H-modes not steady. No ITB. Nice try, though, John. Next step: try the lowest field. 026: Goes H-mode ohmically immediately prior to J-port turn-on. Lots of little H-modes during the RF pulse and afterwards. Next: drop Ip to 0.5MA. 027: Good shot. Looks like yesterday's plasmas. J-port trips twice. Move on now to 5.3T, 0.8MA, with 80MHz RF. 028: 4 H-modes, short and inelegant. 029: Many trips from E-port, No H-mode 030: No H-mode from the very trippy D+E, though there are steady periods of 70-80ms. A similar duration pulse from J-port gives an apparent H-mode at 1.45s (though TS pedestal is not clear). 031: No H-modes. 032: Good shot. 2 ELM-free H-modes. 033: Disruptivo! I was going to try this current on the last shot, but Earl beat me to it. 034: 1 little H-mode, triggered by J, which apparently heats better than E. 035: Ugly H-modes. TCI trace acts funny; Irby says the CO2 laser power dropped inappropriately. 036: Nice shot. 4 H-modes, the last 2 of which are ohmic. Some of the most EDA-like H-modes today, despite the q95 being ~3. |
| Physics Operator Summaries |
| Session Leader Comments | |||
| May 7 2004 08:51:12:257AM | Martin Greenwald | MP 385, 396 Session Leader: Greenwald Phys Op: Marmar Background: Recent work has revealed a connection between self-generated core and SOL flows, topology and the L/H threshold [1,2]. The work has suggested a novel hypothesis for the dependence of the H-mode power threshold on the $\nabla$B drift direction. This 0$^{th}$ order effect, which roughly doubles the required power to acheve H-mode when the ion drift is in the direction away from a single null x-point, may be understood as the result of two rotation components which add or subtract depending on topology. The first is SOL flow which is driven in a direction determined by topology as parallel transport attempts to symmetrize poloidally asymmetric cross-field transport (ballooning) and which couples across the separatrix into the core plasma. The second is topology independent and increases (increments) monotonically in the co-current direction as the plasma pressure increases. The H-mode threshold could then be understood as a critical edge flow (or flow gradient) which requires very different input powers in the two cases. For the conditions studied, 0.8 MA, 5.4 T and 1.2-1.6 x 10$^{20}$, the transition occurs when core toroidal rotation reaches about 0 for USN, LSN and DN plasmas. (In contrast to input power or edge temperature which vary strongly with topology. [3]) To make a connection to the broader issues of the L/H threshold, we would like to determine if this picture holds for other plasma conditions and particularly to measure dependence on parameters which are known to be important for the L/H power threshold, namely n and B. Plan: We're going to try to do both mp 385 and 396 - at least as far as we can with the power available at 50 MHz. We'll start with 1040506023 and try to get a decent H-mode. The RF pulse should start at the beginning of the TF flat-top ~ 0.8 sec. Variations on this theme: 1. adjust the power to get good threshold discharges 2. go to max power to get the best h-modes for the pedestal scaling 3. if there is sufficient headroom in the RF power, vary density or topology and get a higher power threshold point. 4. ditto, but vary Bt to get additional pedestal data. 5. get matching data (same q, etc) at 80 MHz. | |
| May 7 2004 02:05:20:340PM | Martin Greenwald | Results: After some conditioning, we nailed down both thresholds. Given the power limitation though, we weren't able to go much past double null. In lower null the power threshold was with Prf between 0.5 and 0.6 MW. Ohmic power was about 0.5 MW.Rotation was slightly counter - but less than -10 km/s - before RF. Little change was observed with RF. Increased to about +20 km/s during H-mode. For 1.4 MW the threshold occurred with ssep between +1 and +2 mm. Though small, this difference gave repeatable results,.indicating how sensitive the threshold is to the topology. With this geometry, vphi was -20 km/sec in target plasma. Rotation increased with RF and was slightly co at the time of transition. Shots for further analysis: Shot Prf ssep nebar H-modes 01 1.15 -25mm 1.1 yes 02 1.14 -25 1.1 yes 03 1,12 -25 1.1 yes 04 1.17 -26 1.1 yes 05 1.15 -25 1.1 yes 06 1.15 -25 1.1 yes 07 1.15 -25 1.0 yes 08 0.95 -25 0.95 yes 09 0.75 -25 0.97 yes 11 0.63 -22 0.88 yes 12 0.53 -25 0.9 no 13 1.10 +01.6 0.84 yes 14 1.10 +03 0.75 no 15 1.10 +03.5 0.8 no 16 1.4 +03,5 0.8 no 17 1.4 +01.5 0.8 no 18 1.4 +01 0.8 yes ! | |
| May 7 2004 09:12:04:107AM | 1040507001 | Martin Greenwald | 3 brief H-modes Prf = 1.15 |
| May 7 2004 09:36:40:583AM | 1040507002 | Martin Greenwald | 6 distinct h-modes |
| May 7 2004 10:11:00:070AM | 1040507004 | Martin Greenwald | Series of h-modes |
| May 7 2004 10:11:14:007AM | 1040507005 | Martin Greenwald | disruption at 1 sec |
| May 7 2004 10:36:18:840AM | 1040507007 | Martin Greenwald | similar to previous shots |
| May 7 2004 10:50:12:990AM | 1040507008 | Martin Greenwald | RF power lowered to 0.95 MW still get early H-modes |
| May 7 2004 11:05:39:703AM | 1040507009 | Martin Greenwald | RF power lowered to 0.7 MW Still one brief h-mode |
| May 7 2004 11:19:13:200AM | 1040507010 | Martin Greenwald | TCI laser dropped out, density rise caused early disruption. |
| May 7 2004 11:31:39:117AM | 1040507011 | Martin Greenwald | Prf droopped to 0.6 MW 2 h-mode periods, first at 1.2 secs |
| May 7 2004 11:43:29:610AM | 1040507012 | Martin Greenwald | Prf dropped to 0.5 MW no H-modes previous shot = threshold for lower null |
| May 7 2004 12:10:54:600PM | 1040507013 | Martin Greenwald | Power back up to 1.2 MW SSEP increased to +1 mm multiple h-modes vphi slightly counter before RF |
| May 7 2004 12:21:54:910PM | 1040507014 | Martin Greenwald | ssep to + 3. mm no h-mode |
| May 7 2004 12:33:52:217PM | 1040507015 | Martin Greenwald | repeat ssep at +.35 Prf = 1.1 MW no h-mode |
| May 7 2004 12:50:41:773PM | 1040507016 | Martin Greenwald | prf up to 1.4 MW ssep at + 0.35 still no H-mode |
| May 7 2004 01:15:12:797PM | 1040507018 | Martin Greenwald | ssep back to +1 mm several h-modes so threshold at this power (1.4 MW) is between +1 and +2 mm |
| May 7 2004 01:33:06:070PM | 1040507019 | Jerry Hughes | Repeat of 12, with higher RF power. SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 019 3.4 0.5 5.2 1.25 0.0 RF good and steady. H-modes, decent pedestal data. |
| May 7 2004 02:06:23:027PM | 1040507020 | Jerry Hughes | Ip to 0.8MA. SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 020 3.4 0.8 3.2 1.25 0.0 RF good and steady. Repeat for more TS data. |
| May 7 2004 02:06:30:493PM | 1040507021 | Jerry Hughes | Repeat of 020 SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 021 3.4 0.8 3.2 1.25 0.0 RF good and steady. |
| May 7 2004 02:13:35:100PM | 1040507022 | Jerry Hughes | SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 022 3.8 0.8 3.7 1.25 0.0 Good. Raise the target density slightly on next shot and see whether that affects L-H transition time or H-mode quality. |
| May 7 2004 02:30:16:343PM | 1040507023 | Jerry Hughes | SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 023 3.8 0.8 3.7 1.25 0.0 Raising the target density seemed to help. H-mode followed soon upon RF turn-on, without the wait for the initial slow density rise. |
| May 7 2004 02:36:27:153PM | 1040507024 | Jerry Hughes | SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 024 3.8 0.5 5.9 1.25 0.0 Lots of short ELM-free H-modes. Decent pedestal data. |
| May 7 2004 02:52:57:117PM | 1040507025 | Jerry Hughes | Tweak field slightly for JR and look for an ITB with RF resonance on low-field side. SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 025 4.0 0.5 6.1 1.25 0.0 H-modes not steady. No ITB. Nice try, though, John. Next step: try the lowest field. |
| May 7 2004 03:06:18:033PM | 1040507026 | Jerry Hughes | SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 026 3.0 0.8 2.9 1.25 0.0 Goes H-mode ohmically immediately prior to J-port turn-on. Lots of little H-modes during the RF pulse and afterwards. Next: drop Ip to 0.5MA. |
| May 7 2004 03:19:31:607PM | 1040507027 | Jerry Hughes | SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 027 3.0 0.5 4.7 1.25 0.0 Good shot. Looks like yesterday's plasmas. J-port trips twice. Move on now to 5.3T, 0.8MA, with 80MHz RF. |
| May 7 2004 03:34:19:930PM | 1040507028 | Jerry Hughes | SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 028 5.3 0.8 5.0 0.0 1.3 4 H-modes, short and inelegant. |
| May 7 2004 03:56:27:937PM | 1040507029 | Jerry Hughes | SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 029 5.3 0.5 7.7 0.0 1.25 Many trips from E-port, No H-mode |
| May 7 2004 03:59:39:420PM | 1040507030 | Jerry Hughes | SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 030 5.3 0.5 7.8 1.3 1.3 No H-mode from the very trippy D+E, though there are steady periods of 70-80ms. A similar duration pulse from J-port gives an apparent H-mode at 1.45s (though TS pedestal is not clear). |
| May 7 2004 04:14:30:290PM | 1040507031 | Jerry Hughes | SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 031 5.3 0.5 7.9 1.35 1.25 No H-modes. |
| May 7 2004 04:19:44:630PM | 1040507032 | Jerry Hughes | SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 032 5.3 1.2 3.5 1.45 1.05 Good shot. 2 ELM-free H-modes. |
| May 7 2004 04:31:18:633PM | 1040507033 | Jerry Hughes | SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 033 4.6 1.2 2.9 1.35 0.0 Disruptivo! I was going to try this current on the last shot, but Earl beat me to it. |
| May 7 2004 05:05:21:367PM | 1040507034 | Jerry Hughes | SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 034 4.6 0.8 4.4 1.2 1.4 1 little H-mode, triggered by J, which apparently heats better than E. |
| May 7 2004 05:02:47:977PM | 1040507035 | Jerry Hughes | SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 035 4.6 0.5 7.0 1.2 1.45 Ugly H-modes. TCI trace acts funny; Irby says the CO2 laser power dropped inappropriately. |
| May 7 2004 05:13:11:540PM | 1040507036 | Jerry Hughes | SHOT B(T) Ip(MA) q95 Pj(MW) Pde(MW) 036 4.6 1.2 3.1 1.0 1.45 Nice shot. 4 H-modes, the last 2 of which are ohmic. Some of the most EDA-like H-modes today, despite the q95 being ~3. |
| Physics Operator Comments | |||
| May 7 2004 10:38:01:793AM | 1040507001 | Earl Marmar | load from 1040506023 start TF ramp down to 3.4 Tesla at .05 s plasma 1.2 MW RF; very brief H-mode(s) |
| May 7 2004 10:37:47:340AM | 1040507002 | Earl Marmar | no PCS changes plasma 1.2 MW RF, more H-modes (~6) |
| May 7 2004 10:38:43:573AM | 1040507003 | Earl Marmar | no PCS changes plasma 1.2 MW RF; many short H-modes |
| May 7 2004 10:37:30:200AM | 1040507004 | Earl Marmar | no pcs changes plasma 1.2 MW RF; last H-mode a little longer |
| May 7 2004 10:13:29:210AM | 1040507005 | Earl Marmar | nl_04 target to 4.5e19 (from 5.0e19) plasma disrupt at 1.01 lost OH2L prior to disruption (~.93 s) |
| May 7 2004 10:37:15:230AM | 1040507006 | Earl Marmar | no pcs changes plasma 1.1 MW; multiple H-modes |
| May 7 2004 10:39:43:400AM | 1040507007 | Earl Marmar | no PCS changes plasma 1.1 MW; multiple H-modes |
| May 7 2004 10:49:38:630AM | 1040507008 | Earl Marmar | no pcs changes plasma 0.9 MW, multiple H-modes |
| May 7 2004 11:06:13:533AM | 1040507009 | Earl Marmar | no PCS changes plasma .7 MW RF; 1 H-mode |
| May 7 2004 11:19:37:310AM | 1040507010 | Earl Marmar | no PCS changes plasma density feedback problem, gas full on at 0.9 s disrupt at 1.27 s |
| May 7 2004 11:42:36:487AM | 1040507011 | Earl Marmar | no PCS changes plasma .6 MW RF, still got H-mode |
| May 7 2004 11:43:06:703AM | 1040507012 | Earl Marmar | no PCS changes plasma .5 MW, no H-mode |
| May 7 2004 12:09:55:413PM | 1040507013 | Earl Marmar | many PCS changes going for SSEP = -.001 m Imported SSEP control from 1040409002, segment 4, wire 11 into segment 2, wire 11 changed to Ip reference for wires 9-12 moved SSEP up to -.001 changes gains on various wires Plasma multiple H-modes SSEP = +.0012 m |
| May 7 2004 12:23:26:487PM | 1040507014 | Earl Marmar | SSEP prog to +.001 plasma SSEP = +.003 m no H-mode evident |
| May 7 2004 12:43:21:963PM | 1040507015 | Earl Marmar | move SSEP gain increase, ZXU gain decrease to 0.5 sec (from 0.7) plasma 1.1 MW RF, no H-Mode |
| May 7 2004 12:52:16:180PM | 1040507016 | Earl Marmar | no PCS changes plasma 1.4 MW RF, no H-Mode |
| May 7 2004 01:07:15:987PM | 1040507017 | Earl Marmar | SSEP prog to 0.000 (from +0.001) add 15 msec to Ar puff (PG1), now 75 msec plasma 1.4 MW, no H-mode |
| May 7 2004 01:15:02:920PM | 1040507018 | Earl Marmar | SSEP prog to -0.001 plasma 1.4 MW RF, multiple H-modes |
| May 7 2004 01:28:53:307PM | 1040507019 | Earl Marmar | switching to MP 396 Jerry Hughes takes over as session leader reload shot 12 from today plasma |
| May 7 2004 01:54:38:187PM | 1040507020 | Earl Marmar | Ip to 0.8 MA plasma |
| May 7 2004 01:54:53:047PM | 1040507021 | Earl Marmar | no pcs changes plasma |
| May 7 2004 02:12:08:883PM | 1040507022 | Earl Marmar | 3.8 Tesla I_tf to -100kA plasma |
| May 7 2004 02:20:24:347PM | 1040507023 | Earl Marmar | raise target nl_04 to 6e19 (from 4.5e19) plasma current turned around at .105, then recovered |
| May 7 2004 02:53:20:367PM | 1040507024 | Earl Marmar | I_p to 500kA plasma |
| May 7 2004 02:49:37:150PM | 1040507025 | Earl Marmar | TF to 4.0 Tesla (-106100 Amp) plasma |
| May 7 2004 03:05:52:097PM | 1040507026 | Earl Marmar | 2.9 Tesla, 0.8 MA plasma q_95 gets as low as 2.86 |
| May 7 2004 03:20:12:043PM | 1040507027 | Earl Marmar | 0.5 MA plasma |
| May 7 2004 03:32:57:023PM | 1040507028 | Earl Marmar | 5.3 Tesla, 800 kA plasma |
| May 7 2004 03:38:00:380PM | 1040507029 | Earl Marmar | 0.5 MA Tweak TF current program in segment 1 enable PG2, 3He puff, 60 msec starting at 0.3 seconds plasma many rf trips |
| May 7 2004 03:55:07:890PM | 1040507030 | Earl Marmar | no pcs changes plasma |
| May 7 2004 04:03:13:277PM | 1040507031 | Earl Marmar | no pcs changes plasma disrupt at 1.4 seconds |
| May 7 2004 04:18:15:757PM | 1040507032 | Earl Marmar | 1.2 MA, target nl_04 to 1.0e20 plasma 2 ELM-free periods |
| May 7 2004 04:30:22:790PM | 1040507033 | Earl Marmar | 4.6 Tesla, 1.2 MA (should have been 0.8), nl_04 target to 8e19 plasma disrupt at 1.12 s q95 = 2.84 just before the disruption |
| May 7 2004 04:43:55:750PM | 1040507034 | Earl Marmar | 4.6 Tesla, 800 kA plasma H-mode from J-port, not during E |
| May 7 2004 04:59:17:300PM | 1040507035 | Earl Marmar | no pcs changes plasma |
| May 7 2004 05:10:26:823PM | 1040507036 | Earl Marmar | 1.2 MA, nl_04 target to 1e20, A-coils to 2500 A plasma 4 H-modes, at least 2 are purely ohmic |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:04:34:750AM | Plasma | Ok | |
| 2 | 09:19:35:057AM | Plasma | Ok | |
| 3 | 09:35:20:630AM | Plasma | Ok | |
| 4 | 09:50:10:623AM | Plasma | Ok | |
| 5 | 10:02:50:633AM | Plasma | Bad | OH2L Power Supply Fault |
| 6 | 10:20:23:267AM | Plasma | Ok | |
| 7 | 10:33:02:263AM | Plasma | Ok | |
| 8 | 10:46:22:727AM | Plasma | Ok | |
| 9 | 11:00:20:580AM | Plasma | Ok | |
| 10 | 11:14:33:483AM | Plasma | Ok | |
| 11 | 11:27:00:773AM | Plasma | Ok | |
| 12 | 11:39:32:520AM | Plasma | Ok | |
| 13 | 12:05:42:353PM | Plasma | Ok | |
| 14 | 12:18:02:457PM | Plasma | Ok | |
| 15 | 12:30:46:483PM | Plasma | Ok | |
| 16 | 12:44:12:480PM | Plasma | Ok | |
| 17 | 12:57:06:647PM | Plasma | Ok | |
| 18 | 01:09:48:517PM | Plasma | Ok | |
| 19 | 01:22:12:027PM | Plasma | Ok | |
| 20 | 01:34:37:960PM | Plasma | Ok | |
| 21 | 01:47:41:733PM | Plasma | Ok | |
| 22 | 02:03:56:807PM | Plasma | Ok | |
| 23 | 02:16:27:943PM | Plasma | Ok | |
| 24 | 02:28:57:390PM | Plasma | Ok | |
| 25 | 02:43:40:870PM | Plasma | Ok | |
| 26 | 02:56:20:617PM | Plasma | Ok | |
| 27 | 03:08:49:673PM | Plasma | Ok | |
| 28 | 03:21:23:543PM | Plasma | Ok | |
| 29 | 03:33:56:883PM | Plasma | Ok | |
| 30 | 03:46:28:690PM | Plasma | Ok | |
| 31 | 03:58:57:827PM | Plasma | Ok | |
| 32 | 04:13:29:993PM | Plasma | Ok | |
| 33 | 04:26:29:210PM | Plasma | Ok | |
| 34 | 04:38:54:310PM | Plasma | Ok | |
| 35 | 04:51:37:313PM | Plasma | Ok | |
| 36 | 05:05:04:133PM | Plasma | Ok | |