| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Paul Bonoli |
| Physics operator(s): | Ian Hutchinson |
| Engineering operator(s): | Bill Cochran |
| Engineering Operator Run Comment |
| MP 269 ICRF Rotation Studies. Bonoli/Hutchinson/Cochran |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:24:070PM |
| Author: To Be Determined |
| Run Summary for MP 269: ICRF Rotation Studies: 1000607 Physics Operator: Ian Hutchinson Session Leader: Paul Bonoli One of the primary objectives of this mini-proposal was to go to high magnetic field (5.5T -> 6.0T) and measure the toroidal rotation in the presence of off-axis ICRF D(H) minority heating. This data was to supplement rotation measurements that had been made at low toroidal field (4.5T - 5.3T) on May 23, 2000, where the toroidal rotation was observed to reverse direction from co- to counter-current. A second objective was to reproduce and explore in more detail the internal transport barrier (ITB) formation that had been observed at 4.5 T on 5-23-2000. The first objective was not accomplished for a variety of reasons. We had problems with the D-port antenna shutting down due to voltage arcs, thus we were not able to get sustained H-modes. We tried raising the current from 0.8 kA to 1.0 MA, increasing the plasma density, and ramping B_o from 5.3T to 6.0T. All of these measures did not cure the D-port antenna trips. Finally, we were able to get both transmitters to stay on by ramping the D-port power from 0.3 MW to about 1.0 MW, with E-port turned on hard (see Shot 014). Even with both transmitters surviving the entire pulse, good H-modes could not be achieved because of voltage arcs on the antenna(s) and subsequent impurity injections. These results were especially frustrating in that D(H) minority heating was done routinely at (5.5 - 6.6)T during the 1998 C-Mod run campaign. D and E port antenna operation at high field should probably be the subject of its own mini-proposal in order to determine what has changed in the machine since 1998. The second objective was accomplished with great results (shots 3-8). We were able to reproduce plasmas with impressive core density barriers at 4.3 - 4.5 T and with 2.8 MW of off-axis ICRF heating. Central densities up to 6.0 X 10^20 were measured from visible Bremsstrahlung with pedestal values around 2 X 10^20 at r/a > 0.5. The core rotation was also observed to reverse sign. By scanning the toroidal field in small steps of (5.1, 4.9, 4.7, 4.6, 4.5, 4.3)T, we were able to establish a critical field of 4.5 T for the onset of the density barrier mode and the reversal of the toroidal rotation. It is worth noting that even at 4.6T with the ICRF resonance located 8.4 cm to the high field side (HFS), the rotation remained co-current for the entire pulse (see shots 022 and 023). This result would seem to contradict the theory of Perkins et al., where the rotation is predicted to be counter- current with an HFS ICRF resonance. The core density barrier mode is also of special interest because it can be produced in a "steady state" fashion without continous ramping of the toroidal field. It is recommended that this low field ITB mode be studied in far more detail in the future. Another interesting physics result during this run also came out of the phase contrast imaging (PCI) diagnostic (see shot 019 for example). The PCI was able to detect the fast wave as the field was dropped, with detection occurring first at 4.5T. A shot by shot description of the run is given below. --------------------------------------------------------------------------- --------------------------------------------------------------------------- Engineering Setup: Start ECDC two hours before run. Power system setup: Same as for 1000602022, except B_t is programmed to 5.3T flat-top. Gas Setup: B-Top 6 psi D2 Hybrid enabled B-side lower 1 psi Argon Hybrid Enabled C-side 30 psi D2 Hybrid Enabled J-bottom Leave as is Hybrid DISABLED RF Setup: RF pulse from 0.7 sec. to 1.4 sec. D & E antennas to provide 2.2 MW ---------------------------------------------------------------------------- 1000607001 bonoli SESSION_LEADER Jun 7 2000 9:05:31:186AM . . . . . . . . . . . . . . . . . . . . Shot 1: Two OH switches not turned on - try agaon ---------------------------------------------------------------------------- 1000607002 bonoli SESSION_LEADER Jun 7 2000 9:27:11:110AM . . . . . . . . . . . . . . . . . . . . Shot 2: Start B_t scan of rotation - 5.11T Argon enabled Plasma - but RF did not stay on (multiple trips on D & E transmitters). Take shot again with smaller gap (1 cm) ---------------------------------------------------------------------------- 1000607003 bonoli SESSION_LEADER Jun 7 2000 9:52:05:856AM . . . . . . . . . . . . . . . . . . . . Shot 3: 5.11T - ICRF resonance at 2.1 cm to HFS Argon enabled D & E ports retuned (for 5.1 T) Great Shot !!!! Plasma - Good EDA H-mode with 108 kJ and nl_04 = 1.5 D & E ran through (with only a few trips) (2.7 - 2.8 MW) V-tor from HIREXjr is 50 km / s v-tor from sawtooth precursor about the same Go on to 4.9 T ---------------------------------------------------------------------------- 1000607004 bonoli SESSION_LEADER Jun 7 2000 10:03:44:610AM . . . . . . . . . . . . . . . . . . . . Shot 4: 4.9T - ICRF resonance at 4.6 cm to HFS Argon enabled Another good shot ! Plasma - Good EDA H-mode with 105 kJ and nl_04 = 1.5 D & E antennas stayed on - no trips (2.7 - 2.8 MW) V-tor from HIREXjr is about 45 km / s v-tor from sawtooth precursor is higher - about 60 km / s Go on to 4.7T ---------------------------------------------------------------------------- 1000607005 bonoli SESSION_LEADER Jun 7 2000 10:25:30:326AM . . . . . . . . . . . . . . . . . . . . Shot 5: 4.7T - ICRF resonance at 7.2 cm to HFS Argon enabled Another good shot ! Plasma - Good EDA H-mode with 95 kJ and nl_04 = 1.5 H / D ratio about 0.03 D & E antennas stayed on - (2.7 - 2.8 MW) V-tor from HIREXjr is lower at about 35 km / s v-tor from sawtooth precursor is even higher - about 55 km / s Go on to 4.5 T next shot ---------------------------------------------------------------------------- 1000607006 bonoli SESSION_LEADER Jun 7 2000 10:40:04:450AM . . . . . . . . . . . . . . . . . . . . Shot 6: 4.5T - ICRF resonance at 9.7 cm to HFS Argon enabled No plasma - fizzle Try again ---------------------------------------------------------------------------- 1000607007 bonoli SESSION_LEADER Jun 7 2000 11:06:52:920AM . . . . . . . . . . . . . . . . . . . . Shot 7: 4.5T - ICRF resonance at 9.7 cm to HFS Argon enabled OBSERVED DENSITY RISE - nl_04 increases to 1.8 Plasma - Goes ELM free(??) with 80-90 kJ H / D ratio about 0.03 D & E antennas stayed on - (2.7 - 2.8 MW) V-tor from HIREXjr clearly SLOWING DOWN AND REVERSING SIGN v-tor from sawtooth precursor also slows down and goes to zero Take another shot at 4.5T for John Rice to look at poloidal rotation. ---------------------------------------------------------------------------- 1000607008 bonoli SESSION_LEADER Jun 7 2000 11:29:15:280AM . . . . . . . . . . . . . . . . . . . . Shot 8: 4.5T - ICRF resonance at 9.7 cm to HFS Argon enabled OBSERVED DENSITY RISE AGAIN- nl_04 increases to 1.8 Plasma - with 80-90 kJ H / D ratio about 0.03 D & E antennas stayed on - (2.7 MW) V-tor from HIREXjr clearly SLOWING DOWN AND REVERSING SIGN to about -30 km / s v-tor from sawtooth precursor also slows down and goes to zero Next shot at 5.5T ---------------------------------------------------------------------------- 1000607009 bonoli SESSION_LEADER Jun 7 2000 11:42:26:746AM . . . . . . . . . . . . . . . . . . . . Shot 9: 5.5T - ICRF resonance at 3 cm to the LFS Argon enabled Plasma - EDA H-mode with with 108 kJ and nl_04 = 1.5 H / D ratio about 0.03 D & E antennas - suffered from multiple trips (2.7 - 2.8 MW) maximum. V-tor from HIREXjr about 40 km / s, but not very long duration Take another shot at 5.5T ---------------------------------------------------------------------------- 1000607010 bonoli SESSION_LEADER Jun 7 2000 11:57:25:013AM . . . . . . . . . . . . . . . . . . . . Shot 10: 5.5T - ICRF resonance at 3 cm to the LFS Argon enabled Plasma - EDA H-mode with with 102 kJ with nl_04 = 1.5 H / D ratio about 0.03 ICRF power 2.7 MW E-antenna ran flawlessly D-port has some trips V-tor from HIREXjr about 40 km / s, with good duration Next shot at 5.75 T ---------------------------------------------------------------------------- 1000607011 bonoli SESSION_LEADER Jun 7 2000 12:24:35:920PM . . . . . . . . . . . . . . . . . . . . Shot 11: 5.75T - ICRF resonance at 6.2 cm to the LFS Argon enabled Plasma - Short H-mode H / D ratio about 0.03 ICRF power 2.7 MW E-antenna ran flawlessly D-port shit down at 0.92 sec. Try raising current to 1.0 MA on next shot to get same q (safety factor) that we had at 4.5 T. Maybe D-antenna will do better. ---------------------------------------------------------------------------- 1000607012 bonoli SESSION_LEADER Jun 7 2000 12:46:47:983PM . . . . . . . . . . . . . . . . . . . . Shot 12: 5.75T - ICRF resonance at 6.2 cm to the LFS I_p = 1.0 MA Argon enabled D - antenna shut down - just like at 800 kA E-antenna survives with multiple trips Got an H-mode, not very long duration - not enough for a good V-tor measurement from HIREXjr Plan for next shot: Go back to 800 kA Run D-antenna at maxumum power Start E-antenna at 500 kW and ramp up power during pulse. ---------------------------------------------------------------------------- 1000607013 bonoli SESSION_LEADER Jun 7 2000 1:09:13:733PM . . . . . . . . . . . . . . . . . . . . Shot 13: 5.75T - ICRF resonance at 6.2 cm to the LFS I_p = 0.8 MA and E-antenna power ramped from 500 kW Argon enabled D - antenna shut down again E-antenna ramped up nicely from 0.5 MW Got an H-mode, EDA-like. H-mode energy about 80 kJ. Plan for next shot: Stay at 800 kA Ramp up D-antenna from 300 kW Run E-antenna near maximum power for entire pulse. ---------------------------------------------------------------------------- 1000607014 bonoli SESSION_LEADER Jun 7 2000 1:34:32:403PM . . . . . . . . . . . . . . . . . . . . Shot 14: 5.75T - ICRF resonance at 6.2 cm to the LFS I_p = 0.8 MA and D-antenna power ramped from 300 kW Argon enabled D & E survived the pulse operting in this mode. Got multiple H-modes with 80 kJ of stored energy. But still had big impurity injections. Plan for next shot: Stay at 800 kA Ramp up D-antenna from 300 kW with slight retunr. Run E-antenna near maximum power for entire pulse with turn on time increased to 30 msec. ---------------------------------------------------------------------------- 1000607015 bonoli SESSION_LEADER Jun 7 2000 1:44:59:890PM . . . . . . . . . . . . . . . . . . . . Shot 15: 5.75T - ICRF resonance at 6.2 cm to the LFS I_p = 0.8 MA D-antenna power ramped from 300 kW E-port turn on longer (30 msec) Argon enabled D & E operated without trips to point of plasma disruption at 0.83 sec. caused by an impurity injection from antenna. Plan for next shot: Go to 6.0 T Use same waveforms for D & E powers. ---------------------------------------------------------------------------- 1000607016 bonoli SESSION_LEADER Jun 7 2000 2:11:39:310PM . . . . . . . . . . . . . . . . . . . . Shot 16: 6.0T - ICRF resonance at 9.4 cm to the LFS I_p = 0.8 MA D-antenna power ramped from 300 kW E-antenna turn on longer (30 msec) Argon enabled D & E had multiple trips with INCREDIBLE MULTIPLE FIREWORKS ! and injections Plan for next shot: BACK OFF ON D & E -antenna powers, using same turn - on waveforms ---------------------------------------------------------------------------- 1000607017 bonoli SESSION_LEADER Jun 7 2000 2:32:17:406PM . . . . . . . . . . . . . . . . . . . . Shot 17: 6.0T - ICRF resonance at 9.4 cm to the LFS I_p = 0.8 MA D-antenna power ramped from 300 kW to 1.0 MW (max.) E-antenna power limited to 1.0 MW (max.) Argon enabled D & E antennas ran with minimal trips - but lots of injections caused by antenna arcs. Plan for next shot: Keep rf power lowered to 2 MW max. Ramp B_t from 5.3T to 6.0T and get rf to "catch - on" at lower field. ---------------------------------------------------------------------------- 1000607018 bonoli SESSION_LEADER Jun 7 2000 3:01:42:716PM . . . . . . . . . . . . . . . . . . . . Shot 18: Ramp B_t from 5.3T to 6.0T. D-antenna power ramped from 300 kW to 1.0 MW (max.) E-antenna power limited to 1.0 MW (max.) Argon enabled Got multiple H-modes accompanied by rf trips, although D & E port did survive the entire pulse. Plan for next shot: Go back down in field to 4.3T to fill in data points. ---------------------------------------------------------------------------- 1000607019 bonoli SESSION_LEADER Jun 7 2000 3:35:34:796PM . . . . . . . . . . . . . . . . . . . . Shot 19: 4.3T - ICRF resonance is 12.3 cm to HFS D & E antennas at 2.8 MW (max.) Argon enabled D & E ran ok with about 2.8 MW Multiple arcs on E-port antenna accompanied by impurity injections. Plasma - three multiple H-modes and then density barrier forms with nl_04 = 1.73. HIREXjr shows V-tor slowing down and reversing sign again. PCI detecting fast wave. Plan for next shot: Stay at 4.3T and back off on E-port power to 1.0 MW ---------------------------------------------------------------------------- 1000607020 bonoli SESSION_LEADER Jun 7 2000 3:34:14:840PM . . . . . . . . . . . . . . . . . . . . Shot 20: 4.3T - ICRF resonance is 12.3 cm to HFS E-antenna at lower power to eliminate arcs. Argon enabled D & E ran ok with about 2.5 MW (arcing almost gone on antenna) Plasma - Got density barrier again with multiple H-mode transitions superposed on barrier formation. V-tor from HIREXjr agian shows sign reversal (more clearly than Shot 19). Take one more shot at 4.3T for PCI to block signal and confirm fast wave detection. ---------------------------------------------------------------------------- 1000607021 bonoli SESSION_LEADER Jun 7 2000 3:51:55:340PM . . . . . . . . . . . . . . . . . . . . Shot 21: 4.3T - ICRF resonance is 12.3 cm to HFS E-antenna at lower power to eliminate arcs. Argon enabled D & E ran and survived, although some arcing was observed on cameras. Plasma - Got density peaking again with multiple H-mode transitions superposed on barrier formation. V-tor from HIREXjr again shows sign reversal. Next shot go to 4.6T. ---------------------------------------------------------------------------- 1000607022 bonoli SESSION_LEADER Jun 7 2000 4:37:18:013PM . . . . . . . . . . . . . . . . . . . . Shot 22: 4.6T - ICRF resonance is 8.4 cm to HFS Fill in data bewteen 4.5T and 4.7 |
| Entered: Jul 7 2004 03:49:24:100PM |
| Author: To Be Determined |
Argon enaboled. ICRf power at 2.4 MW (max.) D - antenna had some trips but survived. E - antenna ran fine Plasma - No density peaking but got multiple H-mode transitions following voltage arcs on antenna and impurity injections. Plasma rotation co-current (HIREXjr) Next shot - try reducing plasma-antenna gap from 1.5 cm to 1.0 cm to reduce voltage on antenna ---------------------------------------------------------------------------- 1000607023 bonoli SESSION_LEADER Jun 7 2000 4:34:10:360PM . . . . . . . . . . . . . . . . . . . . Shot 23: 4.6T - ICRF resonance is 8.4 cm to HFS Reduce plasma-antenna gap from 1.5 cm to 1.0 cm Argon enabled. D - antenna shut down at 0.88 sec. E - antenna ran fine Plasma - No density peaking but got multiple H-mode transitions again following voltage arcs on antenna and impurity injections. Plasma rotation remains co-current (from HIREXjr) Got to 4.1T next shot ---------------------------------------------------------------------------- 1000607024 bonoli SESSION_LEADER Jun 7 2000 4:52:20:466PM . . . . . . . . . . . . . . . . . . . . Shot 24: 4.1T - ICRF resonance is 14.8 cm to HFS Add ramp to D-port (again) to try to avoid arcing. E-port at max. power Argon enabled. D & E ran fine - no trips....but Plasma - Got five H-mode transitions with nl_04 rise to 1.5 No density barrier observed. Plasma rotation very small. Reload 4.5T (shot 8) for last shot of the day. ---------------------------------------------------------------------------- 1000607025 bonoli SESSION_LEADER Jun 7 2000 5:06:59:186PM . . . . . . . . . . . . . . . . . . . . Shot 25: 4.5T - try repeating Shot 8 (ICRF resonance at 9.4 cm to HFS) Add ramp to D-port (again) to try to avoid arcing. E-port at max. power Argon enabled. D & E ran with multiple trips throughout Plasma - Got three H-mode transitions with nl_04 rise to 1.5 Multiple injections. No density barrier observed. Plasma rotation again very small. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:11:113PM |
| Author: To Be Determined |
| Physop 1000607 MP269 ICRF Resonance Scan SL Bonoli PO Hutch Summary _______ The internal barrier mode was obtained for fields below 4.6T reproducibly. And the rotation reproducibly ramped down. Some additional points were filled in on the scan. It proved impossible to get good ICRF heating at fields above 5.5T, which was the main point of the run, because of arcs on the E-port antenna that did not trip it out but brought in much impurity. Thus, there is a very sensitive dependence of RF antenna arcing on the field. The status of the original test of theory remains unchanged from last week. Initial rotation in H-mode is strongly co-current right down to the lowest field explored. But the waters are muddied by the density peaking and simultaneous spin down and slight reversal that occurs progressively at low field. Scorecard _________ Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax 1 0.000 0.014 2 1.894 0.804 3 1.903 0.801 4 1.898 0.806 5 1.911 0.803 6 0.000 0.042 7 1.896 0.800 8 1.893 0.800 9 1.900 0.805 10 1.889 0.808 11 1.265 0.806 12 1.914 0.998 13 1.879 0.803 14 1.328 0.819 15 0.841 0.829 16 1.896 0.799 17 1.871 0.802 18 1.895 0.802 19 1.471 0.797 20 1.487 0.799 21 1.659 0.799 22 1.913 0.800 23 1.895 0.795 24 1.862 0.797 25 1.925 0.794 Finished summary for 1000607 Total of 25 shots. 25 shots. 23 plasmas. 1 fizzles. 1 duds. Dud was a power supply mistake. Details _______ ---------------------------------------------------------------------------- 1000607xxx hutch PHYSICS_OPERATOR Jun 7 2000 8:53:05:340AM . . . . . . . . . . . . . . . . . . . . MP269 Off-axis ICRF resonance. Cold Start Import Segment 2 from 1000602022 Set ITF to 142kA. Load. Set TF final zero point to 3s to comply with the Wolfe request to limit slew rate. Load. ---------------------------------------------------------------------------- 1000607001 hutch PHYSICS_OPERATOR Jun 7 2000 9:04:51:966AM . . . . . . . . . . . . . . . . . . . . Dud due to power supplies. OH2s screwed up. It looks as if the upper switch did not close. It never reaches current. Operator error on setup. The OH2 switches were not set properly. ---------------------------------------------------------------------------- 1000607002 hutch PHYSICS_OPERATOR Jun 7 2000 9:45:11:860AM . . . . . . . . . . . . . . . . . . . . Reduce fill puff to 19ms, to compensate for the DNB being on. Plasma. Short H-mode with substantial radiation. RF trips repeatedly. Move RCUR out to .68-9 to lower the outer gap ---------------------------------------------------------------------------- 1000607003 hutch PHYSICS_OPERATOR Jun 7 2000 9:56:30:390AM . . . . . . . . . . . . . . . . . . . . Plasma. RF stays on at 2.75MW! Rotates at about 50km/s I_TF to 136kA, 4.9T. ---------------------------------------------------------------------------- 1000607004 hutch PHYSICS_OPERATOR Jun 7 2000 10:18:03:420AM . . . . . . . . . . . . . . . . . . . . Plasma. RF stays on. Good sawteeth fast rotation. I_TF to 130kA. ---------------------------------------------------------------------------- 1000607005 hutch PHYSICS_OPERATOR Jun 7 2000 10:39:01:450AM . . . . . . . . . . . . . . . . . . . . Plasma. RF stays on. 13kHz sawteeth. I_Tf to 124kA. 4.5T ---------------------------------------------------------------------------- 1000607006 hutch PHYSICS_OPERATOR Jun 7 2000 10:49:41:403AM . . . . . . . . . . . . . . . . . . . . Fizzle ICEF4 to -1270A from -1280 ---------------------------------------------------------------------------- 1000607007 hutch PHYSICS_OPERATOR Jun 7 2000 11:14:10:640AM . . . . . . . . . . . . . . . . . . . . Plasma. RF stays on. Density rises, very peaked on axis. Plasma rotation slows to zero in about 250ms. ---------------------------------------------------------------------------- 1000607008 hutch PHYSICS_OPERATOR Jun 7 2000 11:31:52:780AM . . . . . . . . . . . . . . . . . . . . Plasma. Similar to 7. I_TF to 154kA. 5.5T. ---------------------------------------------------------------------------- 1000607009 hutch PHYSICS_OPERATOR Jun 7 2000 11:51:40:263AM . . . . . . . . . . . . . . . . . . . . Plasma. RF trips at 1.1s Repeat. ---------------------------------------------------------------------------- 1000607010 hutch PHYSICS_OPERATOR Jun 7 2000 12:14:42:436PM . . . . . . . . . . . . . . . . . . . . Plasma. Very similar. I_Tf to 162kA. ---------------------------------------------------------------------------- 1000607011 hutch PHYSICS_OPERATOR Jun 7 2000 12:33:07:343PM . . . . . . . . . . . . . . . . . . . . Plasma disrupts at 1.25s. RF trips with big impurity injections. The fast camera shows a lot of plasma-antenna interaction at the top. Raise current to 1MA. ---------------------------------------------------------------------------- 1000607012 hutch PHYSICS_OPERATOR Jun 7 2000 12:55:32:326PM . . . . . . . . . . . . . . . . . . . . Plasma. RF trips. Ip back to .8MA ---------------------------------------------------------------------------- 1000607013 hutch PHYSICS_OPERATOR Jun 7 2000 1:15:20:903PM . . . . . . . . . . . . . . . . . . . . Plasma. Hmode to 1.3s. RF trips at 1s but enough power from E to sustain. ICEF4 to -1280A from -1270. ---------------------------------------------------------------------------- 1000607014 hutch PHYSICS_OPERATOR Jun 7 2000 1:37:00:076PM . . . . . . . . . . . . . . . . . . . . Did not load since 12.45 so the previous initiation tweak not here till 15. Plasma disrupts at 1.3s. RF stays on but with many arcs bringing in impurities. ---------------------------------------------------------------------------- 1000607015 hutch PHYSICS_OPERATOR Jun 7 2000 1:58:59:156PM . . . . . . . . . . . . . . . . . . . . Disrupts at .83s. Giant injections. Fill puff to 18ms. I_TF to 170kA (6T). ---------------------------------------------------------------------------- 1000607016 hutch PHYSICS_OPERATOR Jun 7 2000 2:21:42:810PM . . . . . . . . . . . . . . . . . . . . Plasma. Many injections, but RF stayed on. Camera shows lots of antenna arcs. A spectacular shot on the antenna. Ask for lower RF power. ---------------------------------------------------------------------------- 1000607017 hutch PHYSICS_OPERATOR Jun 7 2000 2:45:28:076PM . . . . . . . . . . . . . . . . . . . . Plasma. Install a field ramp up from 5.3T during the RF. ---------------------------------------------------------------------------- 1000607018 hutch PHYSICS_OPERATOR Jun 7 2000 3:08:42:936PM . . . . . . . . . . . . . . . . . . . . Plasma. Starts well but deteriorates as the field moves up. Antenna arcs. Import segment 2 from shot 7 I_TF to 118kA 4.3T ---------------------------------------------------------------------------- 1000607019 hutch PHYSICS_OPERATOR Jun 7 2000 3:29:39:326PM . . . . . . . . . . . . . . . . . . . . Plasma. Got the E-port arc even at this low field. A density peaking at the end leads to disruption at 1.45s Take 1ms off the fill puff. ---------------------------------------------------------------------------- 1000607020 hutch PHYSICS_OPERATOR Jun 7 2000 3:45:08:030PM . . . . . . . . . . . . . . . . . . . . Plasma. Barrier leads to disruption. Not such obvious antenna arcs, but radiation climbs to 2MW quickly during H-modes. No changes. A shot for the PCI. ---------------------------------------------------------------------------- 1000607021 hutch PHYSICS_OPERATOR Jun 7 2000 4:03:07:013PM . . . . . . . . . . . . . . . . . . . . Plasma. Similar to previous. Some momentary arcs present on antenna ?D? I_TF to 127kA. 4.6T ---------------------------------------------------------------------------- 1000607022 hutch PHYSICS_OPERATOR Jun 7 2000 4:19:09:293PM . . . . . . . . . . . . . . . . . . . . Plasma. No density peaking. Repetitive reversions to L-mode. Radiation is significantly worse than earlier in the run. RF does not stay on well. RCUR to .67 reducing the outer gap by 3-4mm. ---------------------------------------------------------------------------- 1000607023 hutch PHYSICS_OPERATOR Jun 7 2000 4:40:11:060PM . . . . . . . . . . . . . . . . . . . . Plasma. Only 1MW RF because of trips. I_TF to 112kA, 4.1T ---------------------------------------------------------------------------- 1000607024 hutch PHYSICS_OPERATOR Jun 7 2000 4:57:59:093PM . . . . . . . . . . . . . . . . . . . . Plasma. Five accumulating H-modes. Add 1ms of fill puff. I_TF 124kA, 4.5T. NL04 to .8e20 from .9 ---------------------------------------------------------------------------- 1000607024 hutch PHYSICS_OPERATOR Jun 7 2000 5:11:19:390PM . . . . . . . . . . . . . . . . . . . . Plasma. ICRF trips out. |
| Session Leader Comments | |||
| Jun 7 2000 09:05:31:187AM | 1000607001 | Paul Bonoli | Shot 1: Two OH switches not turned on - try agaon |
| Jun 7 2000 09:27:11:110AM | 1000607002 | Paul Bonoli | Shot 2: Start B_t scan of rotation - 5.11T Argon enabled Plasma - but RF did not stay on (multiple trips on D & E transmitters). Take shot again with smaller gap (1 cm) |
| Jun 7 2000 09:52:05:857AM | 1000607003 | Paul Bonoli | Shot 3: 5.11T - ICRF resonance at 2.1 cm to HFS Argon enabled D & E ports retuned (for 5.1 T) Great Shot !!!! Plasma - Good EDA H-mode with 108 kJ and nl_04 = 1.5 D & E ran through (with only a few trips) (2.7 - 2.8 MW) V-tor from HIREXjr is 50 km / s v-tor from sawtooth precursor about the same Go on to 4.9 T |
| Jun 7 2000 10:03:44:610AM | 1000607004 | Paul Bonoli | Shot 4: 4.9T - ICRF resonance at 4.6 cm to HFS Argon enabled Another good shot ! Plasma - Good EDA H-mode with 105 kJ and nl_04 = 1.5 D & E antennas stayed on - no trips (2.7 - 2.8 MW) V-tor from HIREXjr is about 45 km / s v-tor from sawtooth precursor is higher - about 60 km / s Go on to 4.7T |
| Jun 7 2000 10:25:30:327AM | 1000607005 | Paul Bonoli | Shot 5: 4.7T - ICRF resonance at 7.2 cm to HFS Argon enabled Another good shot ! Plasma - Good EDA H-mode with 95 kJ and nl_04 = 1.5 H / D ratio about 0.03 D & E antennas stayed on - (2.7 - 2.8 MW) V-tor from HIREXjr is lower at about 35 km / s v-tor from sawtooth precursor is even higher - about 55 km / s Go on to 4.5 T next shot |
| Jun 7 2000 10:40:04:450AM | 1000607006 | Paul Bonoli | Shot 6: 4.5T - ICRF resonance at 9.7 cm to HFS Argon enabled No plasma - fizzle Try again |
| Jun 7 2000 11:06:52:920AM | 1000607007 | Paul Bonoli | Shot 7: 4.5T - ICRF resonance at 9.7 cm to HFS Argon enabled OBSERVED DENSITY RISE - nl_04 increases to 1.8 Plasma - Goes ELM free(??) with 80-90 kJ H / D ratio about 0.03 D & E antennas stayed on - (2.7 - 2.8 MW) V-tor from HIREXjr clearly SLOWING DOWN AND REVERSING SIGN v-tor from sawtooth precursor also slows down and goes to zero Take another shot at 4.5T for John Rice to look at poloidal rotation. |
| Jun 7 2000 11:29:15:280AM | 1000607008 | Paul Bonoli | Shot 8: 4.5T - ICRF resonance at 9.7 cm to HFS Argon enabled OBSERVED DENSITY RISE AGAIN- nl_04 increases to 1.8 Plasma - with 80-90 kJ H / D ratio about 0.03 D & E antennas stayed on - (2.7 MW) V-tor from HIREXjr clearly SLOWING DOWN AND REVERSING SIGN to about -30 km / s v-tor from sawtooth precursor also slows down and goes to zero Next shot at 5.5T |
| Jun 7 2000 11:42:26:747AM | 1000607009 | Paul Bonoli | Shot 9: 5.5T - ICRF resonance at 3 cm to the LFS Argon enabled Plasma - EDA H-mode with with 108 kJ and nl_04 = 1.5 H / D ratio about 0.03 D & E antennas - suffered from multiple trips (2.7 - 2.8 MW) maximum. V-tor from HIREXjr about 40 km / s, but not very long duration Take another shot at 5.5T |
| Jun 7 2000 11:57:25:013AM | 1000607010 | Paul Bonoli | Shot 10: 5.5T - ICRF resonance at 3 cm to the LFS Argon enabled Plasma - EDA H-mode with with 102 kJ with nl_04 = 1.5 H / D ratio about 0.03 ICRF power 2.7 MW E-antenna ran flawlessly D-port has some trips V-tor from HIREXjr about 40 km / s, with good duration Next shot at 5.75 T |
| Jun 7 2000 12:24:35:920PM | 1000607011 | Paul Bonoli | Shot 11: 5.75T - ICRF resonance at 6.2 cm to the LFS Argon enabled Plasma - Short H-mode H / D ratio about 0.03 ICRF power 2.7 MW E-antenna ran flawlessly D-port shit down at 0.92 sec. Try raising current to 1.0 MA on next shot to get same q (safety factor) that we had at 4.5 T. Maybe D-antenna will do better. |
| Jun 7 2000 12:46:47:983PM | 1000607012 | Paul Bonoli | Shot 12: 5.75T - ICRF resonance at 6.2 cm to the LFS I_p = 1.0 MA Argon enabled D - antenna shut down - just like at 800 kA E-antenna survives with multiple trips Got an H-mode, not very long duration - not enough for a good V-tor measurement from HIREXjr Plan for next shot: Go back to 800 kA Run D-antenna at maxumum power Start E-antenna at 500 kW and ramp up power during pulse. |
| Jun 7 2000 01:09:13:733PM | 1000607013 | Paul Bonoli | Shot 13: 5.75T - ICRF resonance at 6.2 cm to the LFS I_p = 0.8 MA and E-antenna power ramped from 500 kW Argon enabled D - antenna shut down again E-antenna ramped up nicely from 0.5 MW Got an H-mode, EDA-like. H-mode energy about 80 kJ. Plan for next shot: Stay at 800 kA Ramp up D-antenna from 300 kW Run E-antenna near maximum power for entire pulse. |
| Jun 7 2000 01:34:32:403PM | 1000607014 | Paul Bonoli | Shot 14: 5.75T - ICRF resonance at 6.2 cm to the LFS I_p = 0.8 MA and D-antenna power ramped from 300 kW Argon enabled D & E survived the pulse operting in this mode. Got multiple H-modes with 80 kJ of stored energy. But still had big impurity injections. Plan for next shot: Stay at 800 kA Ramp up D-antenna from 300 kW with slight retunr. Run E-antenna near maximum power for entire pulse with turn on time increased to 30 msec. |
| Jun 7 2000 01:44:59:890PM | 1000607015 | Paul Bonoli | Shot 15: 5.75T - ICRF resonance at 6.2 cm to the LFS I_p = 0.8 MA D-antenna power ramped from 300 kW E-port turn on longer (30 msec) Argon enabled D & E operated without trips to point of plasma disruption at 0.83 sec. caused by an impurity injection from antenna. Plan for next shot: Go to 6.0 T Use same waveforms for D & E powers. |
| Jun 7 2000 02:11:39:310PM | 1000607016 | Paul Bonoli | Shot 16: 6.0T - ICRF resonance at 9.4 cm to the LFS I_p = 0.8 MA D-antenna power ramped from 300 kW E-antenna turn on longer (30 msec) Argon enabled D & E had multiple trips with INCREDIBLE MULTIPLE FIREWORKS ! and injections Plan for next shot: BACK OFF ON D & E -antenna powers, using same turn - on waveforms |
| Jun 7 2000 02:32:17:407PM | 1000607017 | Paul Bonoli | Shot 17: 6.0T - ICRF resonance at 9.4 cm to the LFS I_p = 0.8 MA D-antenna power ramped from 300 kW to 1.0 MW (max.) E-antenna power limited to 1.0 MW (max.) Argon enabled D & E antennas ran with minimal trips - but lots of injections caused by antenna arcs. Plan for next shot: Keep rf power lowered to 2 MW max. Ramp B_t from 5.3T to 6.0T and get rf to "catch - on" at lower field. |
| Jun 7 2000 03:01:42:717PM | 1000607018 | Paul Bonoli | Shot 18: Ramp B_t from 5.3T to 6.0T. D-antenna power ramped from 300 kW to 1.0 MW (max.) E-antenna power limited to 1.0 MW (max.) Argon enabled Got multiple H-modes accompanied by rf trips, although D & E port did survive the entire pulse. Plan for next shot: Go back down in field to 4.3T to fill in data points. |
| Jun 7 2000 03:35:34:797PM | 1000607019 | Paul Bonoli | Shot 19: 4.3T - ICRF resonance is 12.3 cm to HFS D & E antennas at 2.8 MW (max.) Argon enabled D & E ran ok with about 2.8 MW Multiple arcs on E-port antenna accompanied by impurity injections. Plasma - three multiple H-modes and then density barrier forms with nl_04 = 1.73. HIREXjr shows V-tor slowing down and reversing sign again. PCI detecting fast wave. Plan for next shot: Stay at 4.3T and back off on E-port power to 1.0 MW |
| Jun 7 2000 03:34:14:840PM | 1000607020 | Paul Bonoli | Shot 20: 4.3T - ICRF resonance is 12.3 cm to HFS E-antenna at lower power to eliminate arcs. Argon enabled D & E ran ok with about 2.5 MW (arcing almost gone on antenna) Plasma - Got density barrier again with multiple H-mode transitions superposed on barrier formation. V-tor from HIREXjr agian shows sign reversal (more clearly than Shot 19). Take one more shot at 4.3T for PCI to block signal and confirm fast wave detection. |
| Jun 7 2000 03:51:55:340PM | 1000607021 | Paul Bonoli | Shot 21: 4.3T - ICRF resonance is 12.3 cm to HFS E-antenna at lower power to eliminate arcs. Argon enabled D & E ran and survived, although some arcing was observed on cameras. Plasma - Got density peaking again with multiple H-mode transitions superposed on barrier formation. V-tor from HIREXjr again shows sign reversal. Next shot go to 4.6T. |
| Jun 7 2000 04:37:18:013PM | 1000607022 | Paul Bonoli | Shot 22: 4.6T - ICRF resonance is 8.4 cm to HFS Fill in data bewteen 4.5T and 4.7T Argon enaboled. ICRf power at 2.4 MW (max.) D - antenna had some trips but survived. E - antenna ran fine Plasma - No density peaking but got multiple H-mode transitions following voltage arcs on antenna and impurity injections. Plasma rotation co-current (HIREXjr) Next shot - try reducing plasma-antenna gap from 1.5 cm to 1.0 cm to reduce voltage on antenna |
| Jun 7 2000 04:34:10:360PM | 1000607023 | Paul Bonoli | Shot 23: 4.6T - ICRF resonance is 8.4 cm to HFS Reduce plasma-antenna gap from 1.5 cm to 1.0 cm Argon enabled. D - antenna shut down at 0.88 sec. E - antenna ran fine Plasma - No density peaking but got multiple H-mode transitions again following voltage arcs on antenna and impurity injections. Plasma rotation remains co-current (from HIREXjr) Got to 4.1T next shot |
| Jun 7 2000 04:52:20:467PM | 1000607024 | Paul Bonoli | Shot 24: 4.1T - ICRF resonance is 14.8 cm to HFS Add ramp to D-port (again) to try to avoid arcing. E-port at max. power Argon enabled. D & E ran fine - no trips....but Plasma - Got five H-mode transitions with nl_04 rise to 1.5 No density barrier observed. Plasma rotation very small. Reload 4.5T (shot 8) for last shot of the day. |
| Jun 7 2000 05:06:59:187PM | 1000607025 | Paul Bonoli | Shot 25: 4.5T - try repeating Shot 8 (ICRF resonance at 9.4 cm to HFS) Add ramp to D-port (again) to try to avoid arcing. E-port at max. power Argon enabled. D & E ran with multiple trips throughout Plasma - Got three H-mode transitions with nl_04 rise to 1.5 Multiple injections. No density barrier observed. Plasma rotation again very small. |
| Physics Operator Comments | |||
| Jun 7 2000 08:53:05:340AM | Ian Hutchinson | MP269 Off-axis ICRF resonance. Cold Start Import Segment 2 from 1000602022 Set ITF to 142kA. Load. Set TF final zero point to 3s to comply with the Wolfe request to limit slew rate. Load. | |
| Jun 7 2000 09:04:51:967AM | 1000607001 | Ian Hutchinson | Dud due to power supplies. OH2s screwed up. It looks as if the upper switch did not close. It never reaches current. Operator error on setup. The OH2 switches were not set properly. |
| Jun 7 2000 09:45:11:860AM | 1000607002 | Ian Hutchinson | Reduce fill puff to 19ms, to compensate for the DNB being on. Plasma. Short H-mode with substantial radiation. RF trips repeatedly. Move RCUR out to .68-9 to lower the outer gap |
| Jun 7 2000 09:56:30:390AM | 1000607003 | Ian Hutchinson | Plasma. RF stays on at 2.75MW! Rotates at about 50km/s I_TF to 136kA, 4.9T. |
| Jun 7 2000 10:18:03:420AM | 1000607004 | Ian Hutchinson | Plasma. RF stays on. Good sawteeth fast rotation. I_TF to 130kA. |
| Jun 7 2000 10:39:01:450AM | 1000607005 | Ian Hutchinson | Plasma. RF stays on. 13kHz sawteeth. I_Tf to 124kA. 4.5T |
| Jun 7 2000 10:49:41:403AM | 1000607006 | Ian Hutchinson | Fizzle ICEF4 to -1270A from -1280 |
| Jun 7 2000 11:14:10:640AM | 1000607007 | Ian Hutchinson | Plasma. RF stays on. Density rises, very peaked on axis. Plasma rotation slows to zero in about 250ms. |
| Jun 7 2000 11:31:52:780AM | 1000607008 | Ian Hutchinson | Plasma. Similar to 7. I_TF to 154kA. 5.5T. |
| Jun 7 2000 11:51:40:263AM | 1000607009 | Ian Hutchinson | Plasma. RF trips at 1.1s Repeat. |
| Jun 7 2000 12:14:42:437PM | 1000607010 | Ian Hutchinson | Plasma. Very similar. I_Tf to 162kA. |
| Jun 7 2000 12:33:07:343PM | 1000607011 | Ian Hutchinson | Plasma disrupts at 1.25s. RF trips with big impurity injections. The fast camera shows a lot of plasma-antenna interaction at the top. Raise current to 1MA. |
| Jun 7 2000 12:55:32:327PM | 1000607012 | Ian Hutchinson | Plasma. RF trips. Ip back to .8MA |
| Jun 7 2000 01:15:20:903PM | 1000607013 | Ian Hutchinson | Plasma. Hmode to 1.3s. RF trips at 1s but enough power from E to sustain. ICEF4 to -1280A from -1270. |
| Jun 7 2000 01:37:00:077PM | 1000607014 | Ian Hutchinson | Did not load since 12.45 so the previous initiation tweak not here till 15. Plasma disrupts at 1.3s. RF stays on but with many arcs bringing in impurities. |
| Jun 7 2000 01:58:59:157PM | 1000607015 | Ian Hutchinson | Disrupts at .83s. Giant injections. Fill puff to 18ms. I_TF to 170kA (6T). |
| Jun 7 2000 02:21:42:810PM | 1000607016 | Ian Hutchinson | Plasma. Many injections, but RF stayed on. Camera shows lots of antenna arcs. A spectacular shot on the antenna. Ask for lower RF power. |
| Jun 7 2000 02:45:28:077PM | 1000607017 | Ian Hutchinson | Plasma. Install a field ramp up from 5.3T during the RF. |
| Jun 7 2000 03:08:42:937PM | 1000607018 | Ian Hutchinson | Plasma. Starts well but deteriorates as the field moves up. Antenna arcs. Import segment 2 from shot 7 I_TF to 118kA 4.3T |
| Jun 7 2000 03:29:39:327PM | 1000607019 | Ian Hutchinson | Plasma. Got the E-port arc even at this low field. A density peaking at the end leads to disruption at 1.45s Take 1ms off the fill puff. |
| Jun 7 2000 03:45:08:030PM | 1000607020 | Ian Hutchinson | Plasma. Barrier leads to disruption. Not such obvious antenna arcs, but radiation climbs to 2MW quickly during H-modes. No changes. A shot for the PCI. |
| Jun 7 2000 04:03:07:013PM | 1000607021 | Ian Hutchinson | Plasma. Similar to previous. Some momentary arcs present on antenna ?D? I_TF to 127kA. 4.6T |
| Jun 7 2000 04:19:09:293PM | 1000607022 | Ian Hutchinson | Plasma. No density peaking. Repetitive reversions to L-mode. Radiation is significantly worse than earlier in the run. RF does not stay on well. RCUR to .67 reducing the outer gap by 3-4mm. |
| Jun 7 2000 04:40:11:060PM | 1000607023 | Ian Hutchinson | Plasma. Only 1MW RF because of trips. I_TF to 112kA, 4.1T |
| Jun 7 2000 04:57:59:093PM | 1000607024 | Ian Hutchinson | Plasma. Five accumulating H-modes. Add 1ms of fill puff. I_TF 124kA, 4.5T. NL04 to .8e20 from .9 |
| Jun 7 2000 05:11:19:390PM | 1000607024 | Ian Hutchinson | Plasma. ICRF trips out. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:55:28:047AM | Plasma | Ok | |
| 2 | 09:18:29:873AM | Plasma | Ok | |
| 3 | 09:38:33:590AM | Plasma | Ok | |
| 4 | 09:55:59:233AM | Plasma | Ok | |
| 5 | 10:16:15:123AM | Plasma | Ok | |
| 6 | 10:34:18:280AM | Plasma | Ok | |
| 7 | 10:52:18:577AM | Plasma | Ok | |
| 8 | 11:12:00:327AM | Plasma | Ok | |
| 9 | 11:30:16:623AM | Plasma | Ok | |
| 10 | 11:49:13:263AM | Plasma | Ok | |
| 11 | 12:12:03:090PM | Plasma | Ok | |
| 12 | 12:31:13:890PM | Plasma | Ok | |
| 13 | 12:52:23:733PM | Plasma | Ok | |
| 14 | 01:13:44:890PM | Plasma | Ok | |
| 15 | 01:34:46:437PM | Plasma | Ok | |
| 16 | 01:57:03:623PM | Plasma | Ok | |
| 17 | 02:20:05:280PM | Plasma | Ok | |
| 18 | 02:43:32:500PM | Plasma | Ok | |
| 19 | 03:05:17:343PM | Plasma | Ok | |
| 20 | 03:24:39:123PM | Plasma | Ok | |
| 21 | 03:42:36:170PM | Plasma | Ok | |
| 22 | 03:59:24:717PM | Plasma | Ok | |
| 23 | 04:17:20:967PM | Plasma | Ok | |
| 24 | 04:36:25:983PM | Plasma | Ok | |
| 25 | 04:56:37:513PM | Plasma | Ok | |