| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Jim Terry |
| Physics operator(s): | Joseph Snipes |
| Engineering operator(s): | Andy Pfeiffer,Bill Parkin |
| Engineering Operator Run Comment |
| MP 458 Type, Filament Structure and Pacing of ELMs in High-triangularity |
| Session Leader Plans |
| Entered: Jun 16 2006 09:28:07:043AM |
| Author: Jim Terry |
| MP 458 - - "Type, Filament Structure and Pacing of ELMs in High-triangularity Plasmas"
1) overnight ECDC with D2 A-coil configuration: normal [+Dtop -Dbot -Jtop +Jbot] and enabled. Gas Setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar + 2 psi Ne Hybrid DISABLED (PG1) fill B-side upper with 15 psi 3He Hybrid enabled - program for valve OPEN from 0.2 to 0.35 s (i.e. for 150 ms) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill NINJA with 10 psi D2 Enabled Load shot 1060510003 begin with RF 0N at 0.7s at 2.3 MW - OFF at 1.2 s. NINJA puff at B inboard midplane and A-B limiter outboard 2) With well-boronized walls, load shot 1060510003 (Ip=0.9 MA, target density NL_04=4e19 m-2, lower triangularity=0.78, ICRF power 2.3 MW, but tweak Bt to 5.5T and outer gap from 2.4 cm to 1.8 cm, keep inner gap at 2.0 cm) - reproduce discrete ELMs (3 shots - with the GPI fast-diodes looking at the inboard radial array for evidence on ELMs on the inboard midplane) SSEP=-4.8 cm. 3) Repeat with SSEP=-2.4 cm. Observe ELM filaments inboard and outboard. (1 shot) 4) Repeat with SSEP=-1.2 cm. Observe ELM filaments inboard and outboard. (1 shot) 5) Repeat with SSEP=0 cm (DN). Observe ELM filaments inboard and outboard. (1 shot) 6) Go back to SSEP at optimal distance for ELMs - repeat with increased ICRF power - up to max available (4 shots) 7) Repeat with decreased ICRF power - 2 MW (4 shots) 8) if time permits - at 2.5 MW of ICRF power, turn on LH power during ELMing phase at 250 kW source power for co-current drive (90 degree �??ideal�?� CD phasing with N||=4), observe change in average ELM frequency. Increase LH power shot-by-shot to 500 kW source power. (7 shots) Key diagnostics: Dα fast-diode arrays with GPI, the fast-diode data window from 0.800 to 0.931 sec diode # trans fiber # view F/no 1 GPI #1 Inner SOL F F/1.4 2 GPI #2 Inner SOL E F/2.0 3 GPI #3 Inner SOL D F/4.0 4 GPI #4 Inner SOL C F/5.6 5 GPI #5 Inner SOL B F/8.0 6 #39 OUTER SOL 2 F/1.4 7 #40 OUTER SOL 3 F/1.4 8 #41 OUTER SOL 31 F/2.8 9 #42 OUTER SOL 32 F/2.0 10 #43 OUTER SOL 33 F/4.0 11 #44 OUTER SOL 7 F/1.4 12 #45 OUTER SOL 35 F/4.0 13 #46 OUTER SOL 22 F/4.0 14 #47 OUTER SOL 10 F/4.0 15 #48 OUTER SOL 11 F/4.0 16 #49 OUTER SOL 12 F/4.0 17 #50 OUTER SOL 1 F/1.4 18 #51 OUTER SOL 9 F/2.8 19 #52 OUTER SOL 23 F/2.8 20 #20 OUTER SOL 5 F/1.4 21 #21 OUTER SOL 34 F/2.8 22 #22 OUTER SOL 4 F/1.4 23 #26 OUTER SOL 6 F/1.4 fast magnetics (with 10 MHz digitization rate starting at 0.70 s), ECE - especially FRCECE with high resolution in the pedestal, Edge TS with scattering volume moved to correspond to this equilibrium and the two lasers timed to be 2 ms apart in time, DALSA VB profiles (will turn-off A-B limiter NINJA puff on some shots), PCI (with at least 2 MHz digitization rate starting at 0.70 s), divertor probes with 1MHz digitization rate. |
| Physics Operators Plans |
| Entered: Jun 15 2006 02:30:14:153PM |
| Author: Joseph Snipes |
| MP 458 Type, Filament Structure and Pacing of ELMs in High-triangularity Plasmas SL: Jim Terry PO: Joseph Snipes ECDC overnight in D2 at 2.e-4 Torr Power systems as on 1060510003 A-coil configuration: normal [+Dtop -Dbot -Jtop +Jbot] and enabled. C-coil Start=0.3sec, Invert=2.0sec ICRF: Need between 2.3 and 2.5 MW from D&E&J run on by 8:30 am Gas Setup: ---------- fill B-top 6psi D2 Hybrid enabled (PG4) fill B-side lower 1 psi Argon + 2 psi Ne Hybrid Disabled (PG1) fill B-side Upper 15 psi 3He Hybrid Enabled (PG2) fill B-main 40psi D2 Hybrid Enabled (PG3) NINJA fill with 10 psi D2 Enable ECE, VUV, Z-bolo shutter assuming no vacuum problems Key diagnostics: D alpha fast-diode arrays with GPI, the fast-diode data window from 0.800 to 0.931 sec diode # trans fiber # view F/no 1 GPI #1 Inner SOL F F/1.4 2 GPI #2 Inner SOL E F/2.0 3 GPI #3 Inner SOL D F/4.0 4 GPI #4 Inner SOL C F/5.6 5 GPI #5 Inner SOL B F/8.0 6 #39 OUTER SOL 2 F/1.4 7 #40 OUTER SOL 3 F/1.4 8 #41 OUTER SOL 31 F/2.8 9 #42 OUTER SOL 32 F/2.0 10 #43 OUTER SOL 33 F/4.0 11 #44 OUTER SOL 7 F/1.4 12 #45 OUTER SOL 22 F/4.0 13 #46 OUTER SOL 36 F/4.0 14 #47 OUTER SOL 10 F/4.0 15 #48 OUTER SOL 11 F/4.0 16 #49 OUTER SOL 12 F/4.0 17 #50 OUTER SOL 1 F/1.4 18 #51 OUTER SOL 9 F/2.8 19 #52 OUTER SOL 23 F/2.8 20 #20 OUTER SOL 5 F/1.4 21 #21 OUTER SOL 34 F/2.8 22 #22 OUTER SOL 4 F/1.4 23 #26 OUTER SOL 6 F/1.4 fast magnetics (with 10 MHz digitization rate starting at 0.70 s), ECE - especially FRCECE with high resolution in the pedestal, Edge TS with scattering volume moved to correspond to this equilibrium and the two lasers timed to be 2 ms apart in time, DALSA VB profiles (will turn-off A-B limiter NINJA puff on some shots), PCI (with 10 MHz digitization rate starting at 0.70 s), divertor probes with 1MHz digitization rate. Run Plan: 1) Load shot 1060510003 begin with RF 0N at 0.7s at 2.3 MW - OFF at 1.2 s. NINJA puff at B inboard midplane and A-B limiter outboard 2) With well-boronized walls, load shot 1060510003(Ip=0.9 MA, target density NL_04=4e19 m-2, lower triangularity=0.78, ICRF power 2.3 MW, but tweak Bt to 5.5T and outer gap from 2.4 cm to 1.8 cm, keep inner gap at 2.0 cm) - reproduce discrete ELMs (3 shots - with the GPI fast-diodes looking at the inboard radial array for evidence on ELMs on the inboard midplane) SSEP=-4.8 cm. 3) Repeat with SSEP=-2.4 cm. Observe ELM filaments inboard and outboard. (1 shot) 4) Repeat with SSEP=-1.2 cm. Observe ELM filaments inboard and outboard. (1 shot) 5) Repeat with SSEP=0 cm (DN). Observe ELM filaments inboard and outboard. (1 shot) 6) Go back to SSEP at optimal distance for ELMs - repeat with increased ICRF power - up to max available (4 shots) 7) Repeat with decreased ICRF power - 2 MW (4 shots) 8) if time permits - at 2.5 MW of ICRF power, turn on LH power during ELMing phase at 250 kW source power for co-current drive (~150 degree \x{201C}ideal\x{201D} CD phasing with N||=4), observe change in average ELM frequency. Increase LH power shot-by-shot to 500 kW source power. (7 shots) |
| Session Leader Summaries |
| Entered: Jun 16 2006 06:11:16:313PM |
| Author: Jim Terry |
| The purposes of this run were two-fold:
1) to see if filaments on the inboard midplane continued to be present when the plasma was gradually changed to have a near DN configuration, and 2) to test the power scaling of the ELM frequency. We were not successful in obtaining an unequivocal result for either of the desired goals. We were able to make large ELMs in this high-triangularity/low collisionality condition. We were also able to scan the magnetic configuration from an SSEP of < -5 cm to near doulbe null with SSEP=-1.5. As SSEP got closer to 0, the ELMs disappeared and a high frequency (f~225 kHz) QCM appeared. The high frequency of the QCM was due to the abnormally low toroidal rotation at this stored energy. (This seems worthy of further investigation.) Thus, we were unable to produce ELMs in the near DN configuration. Nonetheless, the inboard filaments caontinued to appear (as long as there were ELMs at all) even for SSEP values of -2 cm. Regarding the scaling of ELM frequency vs power, we saw no obvious trend over the obtainable power range of 2.3 to 3 MW. Closer analysis is necessary to discern a trend if any. |
| Physics Operator Summaries |
| Entered: Jun 16 2006 05:10:05:320PM |
| Author: Joseph Snipes |
| There was a computer problem at the beginning of the run that cost us a shot, but was not counted. Then, the machine ran quite well until there was a disruption on shot 16. A fizzle then followed. Then, another disruption on shot 18 apparently because the density feedback has an offset of about 2.5 x 10^19 m^-2 so when you ask for 7 x 10^19 m^-2 you get more like 4.5 x 10^19 m^-2, but it is not always the same. Early in the day, this was not the case. It only became a problem after the walls were unloaded after a number of low density shots. Then, a breaker pulled on EF3 on shot 19 at the beginning of the pulse that lost that shot. We had an EF3 test that went OK then the next shot had CAMAC problems in INIT so had no power. Then, we found that over 2 MW of ICRF tended to disrupt the plasma unless the density was above 4.5 x 10^19 m^-2 target. The ELMs were very sensitive to the plasma shape. We scanned ZXU from 0.08 m down to -0.06 m to change SSEP without using SSEP control. SSEP varied from less than -5 cm to about zero. Overall, it was a decent run, but many shots lacked ELMs so I'm not sure how much of the aims of the MP were completed. See the session leader summary. Shot,Duration(s),Ipmax(MA),Result Shot,Duration(s),Ipmax,Result | 01 1.929 0.906 Plasma | 02 1.930 0.910 Plasma | | 03 1.935 0.915 Plasma | 04 1.940 0.916 Plasma | | 05 1.941 0.916 Plasma | 06 1.944 0.917 Plasma | | 07 1.944 0.916 Plasma | 08 1.944 0.919 Plasma | | 09 1.944 0.922 Plasma | 10 1.944 0.922 Plasma | | 11 1.943 0.923 Plasma | 12 1.941 0.919 Plasma | | 13 1.944 0.921 Plasma | 14 1.945 0.920 Plasma | | 15 1.945 0.918 Plasma | 16 0.752 0.982 Plasma | | 17 0.000 0.046 Fizzle | 18 0.905 0.983 Plasma | | 19 0.000 0.042 Dud | 20 0.000 0.008 Dud | | 21 0.000 0.001 Dud | 22 0.792 1.002 Plasma | | 23 1.952 0.910 Plasma | 24 0.907 0.958 Plasma | | 25 1.953 0.914 Plasma | 26 1.948 0.921 Plasma | | 27 0.117 0.603 Plasma | 28 1.947 0.923 Plasma | | 29 1.945 0.919 Plasma Date 1060616: 29 shots. 25 plasmas. 1 fizzles. 0 duds. 3 System Error. (Plasma = Ip gt 50.0 kA Dud = H_alpha lt 0.40 V) |
| Session Leader Comments | |||
| Jun 16 2006 09:57:03:740AM | 1060616001 | Jim Terry | OK shot - 2ms dithers
RF power 1.3 MW (mostly 0.75 MW) NL04 target was 6e19 - decrease for next shot Fast diode NINJA setup NINJA plenum at 477 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. the fast-diode data window from 0.800 to 0.931 sec diode # trans fiber # view F/no 1 GPI #1 Inner SOL F F/1.4 small-0.15V 2 GPI #2 Inner SOL E F/2.0 small-0.4V 3 GPI #3 Inner SOL D F/4.0 small-0.5V 4 GPI #4 Inner SOL C F/5.6 OK 5 GPI #5 Inner SOL B F/8.0 OK 6 #39 OUTER SOL 2 F/1.4 OK-0.55V 7 #40 OUTER SOL 3 F/1.4 OK 8 #41 OUTER SOL 31 F/2.8 OK 9 #42 OUTER SOL 32 F/2.0 OK 10 #43 OUTER SOL 33 F/4.0 OK 11 #44 OUTER SOL 7 F/1.4 small-0.25V 12 #45 OUTER SOL 35 F/4.0 OK 13 #46 OUTER SOL 22 F/4.0 small-0.7V 14 #47 OUTER SOL 10 F/4.0 OK 15 #48 OUTER SOL 11 F/4.0 OK 16 #49 OUTER SOL 12 F/4.0 OK 17 #50 OUTER SOL 1 F/1.4 small-0.25V 18 #51 OUTER SOL 9 F/2.8 OK 19 #52 OUTER SOL 23 F/2.8 OK 20 #20 OUTER SOL 5 F/1.4 small-0.17V 21 #21 OUTER SOL 34 F/2.8 small-0.8V 22 #22 OUTER SOL 4 F/1.4 small-0.12V 23 #26 OUTER SOL 6 F/1.4 small-0.15V |
| Jun 16 2006 10:16:12:420AM | 1060616002 | Jim Terry | good shot - mostly EDA; maybe 3 poor ELMs - not really seen on fds
RF power 2.3 MW (steady) NL04 target was 6.5e19 even though programmed for 4e19 - try to decrease Fast diode NINJA setup NINJA plenum at 477 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. |
| Jun 16 2006 10:29:39:490AM | 1060616003 | Jim Terry | good shot - mostly EDA; grassy ELMs only (see around 0.82-0.84s), no big ELMs
RF power 2.5 MW (steady) NL04 target was 5.7e19 even though programmed for 4e19 - try to decrease pedestal Te's ~600 eV Fast diode NINJA setup NINJA plenum at 477 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. |
| Jun 16 2006 10:49:05:737AM | 1060616004 | Jim Terry | good shot - mostly EDA; perhaps some grassy ELMs; no large ELMs
RF power 2.5 MW (steady) NL04 target was 6.1e19 even though programmed or 4e19 - try to decrease gas puff in segment 1 on next shot pedestal Te's ~600 eV Fast diode NINJA setup NINJA plenum at 477 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. |
| Jul 10 2006 11:57:28:277AM | 1060616005 | Jim Terry | good shot - mostly EDA; grassy ELMs; no classic large ELMs;
ELMs at 0.8038 s 0.8177 0.8038 outer filament is first 0.8400 inner and outer at the same time 0.8470 poor 0.85376 0.85675 RF power 2.5 MW (steady) NL04 target was 5.7e19 even though programmed or 4e19 - again try to decrease gas puff in segment 1 on next shot pedestal Te's ~600 eV Fast diode NINJA setup NINJA plenum at 477 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. |
| Jul 10 2006 12:08:11:140PM | 1060616006 | Jim Terry | good shot - poor large ELMs;
inner gap increased to 2.5 cm ELMs at 0.8111 0.8265 decreases on all outer views 0.84122 decreases on all outer views 0.8526-0.870 grassy 0.875 decreases on all outer views 0.88745 decreases on all outer views 0.90526 decreases on all outer views 0.90903 decreases on all outer views 0.92289 outer is first RF power 2.5 MW (some trips) NL04 target was 5.4e19 even though programmed or 4e19 - again try to decrease gas puff in segment 1 on next shot pedestal Te's ~500-600 eV Fast diode NINJA setup NINJA plenum at 477 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. changed the following F/nos for this shot 2 GPI #2 Inner SOL E F/2.0 to F/1.4 increased signal to ~0.4 V 3 GPI #3 Inner SOL D F/4.0 to F/2.8 bad pickup on this diode 12 #45 OUTER SOL 22 F/4.0 to F/2.8 OK 21 #21 OUTER SOL 34 F/2.8 to F/2.0 OK |
| Jun 16 2006 11:50:34:433AM | 1060616007 | Jim Terry | good shot - OK large ELMs; but not a good signature on the fds
inner gap at 2.5 cm RF power 2.5 MW (some trips) NL04 target was 4.6e19 pedestal Te's ~500-600 eV Fast diode NINJA setup NINJA plenum at 477 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. |
| Jun 16 2006 11:52:22:713AM | 1060616008 | Jim Terry | good shot - OK large ELMs; fds see better ELM signature because of increased outer gap
inner gap at 2.5 cm increased outer gap by 1 cm to 2.5 cm RF power 2.5 MW (some trips) NL04 target was 4.6e19 pedestal Te's ~500-600 eV Fast diode NINJA setup NINJA plenum at 444 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. |
| Jun 16 2006 12:14:40:347PM | 1060616009 | Jim Terry | good shot - OK large ELMs; fds see better ELM signature because of increased outer gap - good ELM on fd's at 0.852 s
inner gap at 2.5 cm increased outer gap by 1 cm to 2.5 cm RF power 2.5 MW (some trips) NL04 target was 4.6e19 pedestal Te's ~500-600 eV Fast diode NINJA setup NINJA plenum at 444 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. |
| Jun 16 2006 12:54:52:863PM | 1060616010 | Jim Terry | good shot - OK large ELMs; fds see a few poor ELMs
tried to bring upper X-pt closer SSEP=-4.5, upper tri=0.17 next shot: decraese Z_XU by another 2 cm inner gap at 2.5 cm outer gap at 2.5 cm RF power 2.5 MW (some trips) NL04 target was 4.2e19 Fast diode NINJA setup NINJA plenum at 444 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. |
| Jun 16 2006 12:55:05:050PM | 1060616011 | Jim Terry | good shot - OK large ELMs; fds see ELMs, .e.g at 0.878 s
tried to bring upper X-pt closer got SSEP=-3.5, upper tri=0.20 next shot: decraese Z_XU by another 2 cm inner gap at 2.5 cm outer gap at 2.5 cm RF power 2.5 MW (some trips) NL04 target was 4.2e19 Fast diode NINJA setup NINJA plenum at 444 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. |
| Jun 16 2006 01:05:41:853PM | 1060616012 | Jim Terry | good shot - OK large ELMs; fds see ELMs, .e.g at 0.852 s
tried to bring upper X-pt closer got SSEP=-1.6, upper tri=.22 next shot: decraese Z_XU by another 1 cm inner gap at 2.5 cm outer gap at 2.5 cm RF power 2.5 MW (some trips) NL04 target was 4.0e19 Fast diode NINJA setup NINJA plenum at 444 Torr D2 Firing capillaries A-B lim and B16-001 at 0.7 s for 0.18 s. FD trigger to 0.85 s |
| Jun 16 2006 01:08:21:320PM | 1060616013 | Jim Terry | good shot - OK large ELMs; fds see ELMs, .e.g at 0.856, 0.872, 0.9285* s
tried to bring upper X-pt closer got SSEP=-2.5, upper tri=.23 next shot: decraese Z_XU by another 1 cm inner gap at 2.5 cm outer gap at 2.5 cm RF power 2.4 MW (some trips) NL04 target was 4.0e19 Fast diode NINJA setup NINJA plenum at 444 Torr D2 Firing capillaries A-B lim and B16-001 at 0.7 s for 0.18 s. FD trigger to 0.85 s |
| Jul 14 2006 10:43:55:860AM | 1060616014 | Jim Terry | good shot - 1 large ELM in fd window - 0.8128 s
inner gap at 2.5 cm outer gap at 2.5 cm RF power 2.4 MW (some trips) NL04 target was 4.0e19 Fast diode NINJA setup NINJA plenum at 444 Torr D2 Firing capillaries A-B lim and B16-001 at 0.7 s for 0.18 s. FD trigger to 0.85 s |
| Jun 16 2006 02:20:00:380PM | 1060616015 | Jim Terry | good shot - OK large ELMs; fds sees tiny ELMs at 0.824 and 0.830 s, still an inboard filament
ELMs getting much less frequent as we go close to DN. QCM at 250 kHz seen on magnetics and PSI, smaller than usual rotation for this stored energy; than is why the QCM freq stays high. tried to bring upper X-pt closer got SSEP=-2.08, upper tri=.276 next shot: decraese Z_XU by another 3 cm inner gap at 2.5 cm outer gap at 2.5 cm RF power 2.4 MW (some trips) NL04 target was 4.0e19 Fast diode NINJA setup NINJA plenum at 444 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. FD trigger to 0.80 s |
| Jun 16 2006 02:07:21:767PM | 1060616016 | Jim Terry | disrupted at 0.75s
tried to bring upper X-pt closer got SSEP=-1.15 before disruption, upper tri=.35 next shot: increase RF power if possible inner gap at 2.5 cm outer gap at 2.5 cm RF power 2.4 MW (some trips) NL04 target was 4.0e19 Fast diode NINJA setup NINJA plenum at 444 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. FD trigger to 0.80 s |
| Sep 15 2006 01:58:15:830PM | 1060616018 | Jim Terry | disrupted at 0.907 s
no ELMs tried to bring upper X-pt closer got SSEP=-1.15 before disruption, upper tri=.35 next shot: increase RF power if possible inner gap at 2.5 cm outer gap at 2.5 cm RF power 2.9 MW (some trips) NL04 target was 2.2e19 !! next shot go back to conditions of shot 009 Fast diode NINJA setup NINJA plenum at 444 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. FD trigger to 0.80 s |
| Sep 15 2006 01:57:37:237PM | 1060616019 | Jim Terry | no plasma |
| Jun 16 2006 04:01:38:903PM | 1060616023 | Jim Terry | back to hi-triangularity shape of shot 009
no H-mode begin RF power scan RF power 2.0 MW (no trips) inner gap at 2.5 cm outer gap at 2.5 cm next shot: RF to 2.4 MW and higher target density NL04 target was 2.9e19 Fast diode NINJA setup NINJA plenum at 444 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. FD trigger to 0.80 s |
| Jul 14 2006 10:51:49:983AM | 1060616024 | Jim Terry | disrupted at 0.906 s
H-mode, but no big ELMs, tiny ones around 0.83s The H-mode density is much lower than for shot 009. Why? begin RF power scan RF power 2.4 MW (no trips) inner gap at 2.5 cm outer gap at 2.5 cm next shot: repeat NL04 target was 2.9e19 Fast diode NINJA setup NINJA plenum at 444 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. FD trigger to 0.80 s |
| Sep 15 2006 02:00:49:443PM | 1060616025 | Jim Terry | full length plasma
possible H-mode, maybe not - no ELMs The H-mode density is much lower than for shot 009. Why? begin RF power scan RF power 2.4 MW (no trips) inner gap at 2.5 cm outer gap at 2.5 cm next shot: Raise target density and RF power to 2.8MW NL04 target was 3.5e19 Fast diode NINJA setup NINJA plenum at 444 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. FD trigger to 0.80 s |
| Jun 16 2006 04:40:58:653PM | 1060616026 | Jim Terry | full length plasma
H-mode - ELMs are back; fd's ELMs at 0.8906 and 0.8927 s begin RF power scan RF power 2.8 MW (multiple trips) inner gap at 2.5 cm outer gap at 2.5 cm next shot: Raise target density and RF power to 2.8MW NL04 target was 6.0e19 Fast diode NINJA setup NINJA plenum at 444 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. FD trigger to 0.80 s |
| Jun 16 2006 05:04:34:193PM | 1060616028 | Jim Terry | full length plasma
H-mode - ELMs are back; no ELMs in fd window 1st batch of ELMs have a frequency of ~125 Hz. begin RF power scan RF power 3.0 MW (but with trips) inner gap at 2.5 cm outer gap at 2.5 cm next shot: drop RF power to 2.2 MW NL04 target was 4.4e19 Fast diode NINJA setup NINJA plenum at 444 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. FD trigger to 0.80 s |
| Jun 16 2006 05:12:56:680PM | 1060616029 | Jim Terry | full length plasma
H-mode - ELMs are back; ELMs in fd window 1st batch of ELMs have a frequency of ~110 Hz. RF power scan RF power 2.4 MW (no trips) inner gap at 2.5 cm outer gap at 2.5 cm next shot: drop RF power to 2.2 MW NL04 target was 4.8e19 Fast diode NINJA setup NINJA plenum at 444 Torr D2 Firing capillaries A-B lim and B16-001 at 0.65 s for 0.18 s. FD trigger to 0.80 s |
| Physics Operator Comments | |||
| Jun 16 2006 09:15:32:477AM | 1060616001 | Joseph Snipes | Shot 001: Loaded shot 10616000 from /home/snipes/trees to start the run. It is a copy of 1060510003 with all magnetics predictors in all four segments called to make the changes due to F11's demise. Added a gas puff on PG2 B-side upper with 3He for J-port 50 MHz ICRF from 0.2 to 0.35 s at 100 V. TF current set to 151500 A to get 5.5 T. RCUR moved out 3 mm to decrease the outer gap by 6 mm to 1.8 cm and keep the inner gap at 2.0 cm. Then reloaded segment 1 from shot 1060615024 for the startup, which seemed good yesterday. Got stuck in INIT. No power shot. |
| Jun 16 2006 09:48:43:863AM | 1060616001 | Joseph Snipes | Shot 001: Despite having computer problems for shot 1, we still got shot 1 and it was a good shot. |
| Jun 16 2006 10:06:27:183AM | 1060616002 | Joseph Snipes | Shot 002: Changed nl04 to 4 x 10^19 m^-2. Still got too high density but otherwise a good shot. |
| Jun 16 2006 10:17:14:297AM | 1060616003 | Joseph Snipes | Shot 003: Removed the pre-programmed gas puffing in segment 2 to attempt to reduce the density some more. Pumped out PG1 B-side lower and refilled it with 1 psi Ar and enabled it from 0.35 to 0.39 s. Reduced prepuff from 25 ms duration to 21 ms duration. Good shot but some runaways early. |
| Jun 16 2006 10:32:36:443AM | 1060616004 | Joseph Snipes | Shot 004: Changed EF4 current from -1325 to -1315 A. Startup is a bit better without runaways. Good shot. |
| Jun 16 2006 10:47:49:320AM | 1060616005 | Joseph Snipes | Shot 005: Reduced EF4 current another 10 A to -1305 A. Reduced preprogrammed gas in segment 1 to try to bring the density down still further. Good shot, but we'd still like lower density. |
| Jun 16 2006 11:25:22:423AM | 1060616006 | Joseph Snipes | Shot 006: Reduced segment 1 pre-programmed gas. Good shot but with some early runaways. |
| Jun 16 2006 11:28:25:097AM | 1060616007 | Joseph Snipes | Shot 007: Reduced segment 1 pre-programmed gas a bit more despite the runaways. Good shot. |
| Jun 16 2006 11:48:41:133AM | 1060616008 | Joseph Snipes | Shot 008: Increased prepuff by 4 ms to 25 ms duration. Reduced RCUR by 5 mm to increase the outer gap by 1 cm. Good shot. |
| Jun 16 2006 11:56:24:903AM | 1060616009 | Joseph Snipes | Shot 009: Increased CLEARIN by 5 mm and increased RCUR by 2.5 mm to increase the inner gap by 5 mm and leave the outer gap the same. Good shot. |
| Jun 16 2006 12:21:36:930PM | 1060616010 | Joseph Snipes | Shot 010: ZXU set to 0.05 m. SSEP went to -4.5 cm. Good shot. |
| Jun 16 2006 12:30:50:527PM | 1060616011 | Joseph Snipes | Shot 011: ZXU set to 0.03 m. SSEP went to -3.5 cm. Good shot. |
| Jun 16 2006 12:43:17:437PM | 1060616012 | Joseph Snipes | Shot 012: ZXU set to 0.01 m. SSEP went to -3.0 cm. Good shot. |
| Jun 16 2006 01:03:33:290PM | 1060616013 | Joseph Snipes | Shot 013: ZXU set to 0.00 m. SSEP went to -2.79 cm. Good shot. |
| Jun 16 2006 01:09:39:993PM | 1060616014 | Joseph Snipes | Shot 014: ZXU set to -0.01 m. SSEP went to -2.57 cm. Good shot. |
| Jun 16 2006 01:48:15:600PM | 1060616016 | Joseph Snipes | Shot 016: ZXU set to -0.06 m. SSEP went to -0.6 cm. Disrupted at 0.748 s. It maybe that the RF is overheating something in the first wall, but the equilibrium looks reasonable. |
| Jun 16 2006 01:55:49:760PM | 1060616017 | Joseph Snipes | Shot 017: Repeat with more RF power. Fizzle! |
| Jun 16 2006 02:09:19:953PM | 1060616018 | Joseph Snipes | Shot 018: Br0 has been drifting up all day. Try dropping it by 0.5 mT to -1.5 mT, though it may simply be a post-disruption fizzle because of impurities in the startup. Try again. Disrupted at 0.9 s. |
| Jun 16 2006 02:29:24:400PM | 1060616019 | Joseph Snipes | Shot 019: Reloaded segment 2 from shot 1060616009 to begin a power scan (and get away from the disruptions hopefully). Bz and Br are completely wrong. Problem with EF3 starting early!? Dud! |
| Jun 16 2006 03:22:30:217PM | 1060616020 | Joseph Snipes | Shot 020: EF3 test shot. EF3 is OK. It appears that the EF3 breaker pulled out just before the shot on shot 19 and that caused the problem with the power supply. |
| Jun 16 2006 03:22:57:263PM | 1060616021 | Joseph Snipes | Shot 021: Try for plasma. CAMAC problems in INIT. No power shot. |
| Jun 16 2006 03:31:50:940PM | 1060616022 | Joseph Snipes | Shot 022: One more time. . . Disrupted at 0.788 s. |
| Jun 16 2006 03:49:24:023PM | 1060616023 | Joseph Snipes | Shot 023: Raised nl04 to 5 x 10^19 m^-2 to attempt to get the gas to come on. For some reason, the density feedback has not been working properly for the last few plasmas. Good shot. |
| Jun 16 2006 04:02:28:437PM | 1060616024 | Joseph Snipes | Shot 024: Raised nl04 to 6 x 10^19 m^-2. There appears to be a 1 x 10^19 m^-2 offset on the density feedback that keeps the gas from coming on when it is supposed to turn on. So, we will ask for more density than we want by that amount. Disrupted at 0.9 s. |
| Jun 16 2006 04:23:57:680PM | 1060616025 | Joseph Snipes | Shot 025: Increased Br0 by 0.5 mT to -1 mT. Good shot. It seems that the offset in the density feedback is getting larger, now something like 3 x 10^19 m^-2!? |
| Jun 16 2006 04:32:22:587PM | 1060616026 | Joseph Snipes | Shot 026: Raised nl04 to 8 x 10^19 m^-2 to try to get 5 x 10^19 m^-2. Got 6 x 10^19 m^-2 target. So, it appears that the walls are filling up a bit with gas again. Good shot. |
| Jun 16 2006 04:41:34:043PM | 1060616027 | Joseph Snipes | Shot 027: Lowered nl04 to 7 x 10^19 m^-2. Disrupted at 0.108 s. |
| Jun 16 2006 04:53:35:377PM | 1060616028 | Joseph Snipes | Shot 028: Repeat. Good shot. |
| Jun 16 2006 05:09:57:087PM | 1060616029 | Joseph Snipes | Shot 029: Repeat. Good shot. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:39:25:500AM | Plasma | Ok | |
| 2 | 09:52:54:193AM | Plasma | Ok | |
| 3 | 10:15:38:077AM | Plasma | Ok | |
| 4 | 10:28:04:847AM | Plasma | Ok | |
| 5 | 10:44:37:557AM | Plasma | Ok | |
| 6 | 11:05:56:383AM | Plasma | Ok | |
| 7 | 11:22:54:047AM | Plasma | Ok | |
| 8 | 11:36:28:020AM | Plasma | Ok | |
| 9 | 11:49:52:213AM | Plasma | Ok | |
| 10 | 12:10:45:457PM | Plasma | Ok | |
| 11 | 12:23:41:680PM | Plasma | Ok | |
| 12 | 12:36:29:870PM | Plasma | Ok | |
| 13 | 12:53:39:690PM | Plasma | Ok | |
| 14 | 01:06:23:960PM | Plasma | Ok | |
| 15 | 01:18:56:293PM | Plasma | Ok | |
| 16 | 01:39:41:660PM | Plasma | Ok | |
| 17 | 01:54:15:667PM | Plasma | Ok | |
| 18 | 02:06:51:280PM | Plasma | Ok | |
| 19 | 02:21:56:570PM | Plasma | Bad | ef3 breaker opened |
| 20 | 02:51:03:987PM | Test | Ok | |
| 21 | 03:02:52:020PM | Test | Bad | |
| 22 | 03:29:55:813PM | Plasma | Ok | |
| 23 | 03:47:41:260PM | Plasma | Ok | |
| 24 | 04:00:21:747PM | Plasma | Ok | |
| 25 | 04:13:51:970PM | Plasma | Ok | |
| 26 | 04:26:32:350PM | Plasma | Ok | |
| 27 | 04:39:27:620PM | Plasma | Ok | |
| 28 | 04:52:07:860PM | Plasma | Ok | |
| 29 | 05:05:13:320PM | Plasma | Ok | |