| Miniproposals | ||||||||||||
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| Operators | |
| Session leader(s): | Steve Wukitch,Rejean Boivin |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Bill Parkin,Ed Fitzgerald |
| Engineering Operator Run Comment |
| MP #268 RF conditiong SL:Boivin/Wukitch PO:Granetz EO:Fitzgerald/Parkin |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:25:977PM |
| Author: To Be Determined |
| Dec. 6th 2000 MP #268 RF conditioning Session leaders: R. Boivin/S. Wukitch Physics operator: R. Granetz We are continuing conditioning/bringing J to high power for long pulse. J antenna and systems came along right away at low power, up to a total of 1.5 MW or so without injections. When a total of 2 MW or more was injected, more arcing/faulting was noted but conditioning (more pulses) did not seem to help in that time span. Shots 2 and 3 had a subtle problem on which the phase was obviously wrong (in spite of the feedback) which may point to some glow discharge before the antenna. After changing the ramp rate for the power it went away. Shots 3-6 had reasonable/nice RF pulses for long periods (up to 800 msec), with increasing power levels. H-mode was obtained on shot 6 with 1.5 ish MW of J alone. EDA was obtained although the confinement was not the greatest overall. Similar impurity generations coupled to control issues resume after shot 007, while the RF power was increased above 2ish MW. We eventually revert the run to noise/pickup remedial in an attempt to remove the pickup of RF on EF1 and EF2. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:12:787PM |
| Author: To Be Determined |
| Physics operator summary for run 1001206: MP #268 RF conditioning Session leaders: R. Boivin/S. Wukitch Physics operator: R. Granetz Summary: Things were going pretty well from an RF standpoint, with J3+J4 delivering up to 2.6 MW, with H-modes, heating, and low radiated power. But there was still a problem with RF pickup screwing up some of the magnet supplies, particularly at the higher RF powers. This problem results in VDE's. The run was stopped early so that the RF leakage could be tracked down. Other than the RF pickup problems, the machine ran very well today, with excellent startup reliability (only one fizzle). Scorecard: 13 plasmas 1 fizzles 0 duds 1 test 0 aborted and/or screwed up by computer problems ---------- 15 total ------------------------------------------------------------------------------- Engineering setup: ECDC in D2 overnight, ending 2 hours before the run. Power systems as on 1001205006. Gas setup: fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED fill B-side upper with 35 psi of D2 Hybrid DISABLED, for ECDC fill C-side with 30 psi of D2 Hybrid enabled leave J-bot as is Hybrid DISABLED Enable the following gate valves: ECE, VUV, Beast, DNB Run starts at 09:00 and ends at 17:00. ------------------------------------------------------------------------------- RF Setup: XMTRs 1,2,3, and 4 should be made ready by 8:00 (run-on). ------------------------------------------------------------------------------- Run Plan: Further tests of J-port performance as a four-strap. Re-load a late shot from yesterday (0.8 MA, 5.3 T, NL_ZMETER). Fire J-port into plasma. During the day we may raise the density, and if everything works well, we may eventually the current. ------------------------------------------------------------------------------- Overnight ECDC in D2 was done. Hybrid coldstart done; no errors found PCS loaded from shot 1001205020 (using NL_ZMETER), except increased pre-fill puff from 17 to 20 ms because the DNB will not be open on the first shot. Also, I enabled the argon right from the first shot. ------------------------------------------------------------------------------- ECDC in D2 may be done between some shots today. Shot 01 -- Plasma. Good shot. Ip=0.8 MA, Btor=5.2 T, nl_04=0.9e20 m-2 (Yes, TCI worked on this shot, but we're using NL_ZMETER for density control.) Max Prf=1.25 MW (J3+J4). No H-mode. Null was not too good, and breakdown was real late. Gas pressure was low also. Next shot: increase Br0 offset by 0.3 mT, increase IC_EF4 by 15 A, and drop pre-fill to 18 ms (since DNB will open on the next shot). Shot 02 -- Plasma. Good shot. Good startup. RF didn't work well. H/D is down at 3.5%. Density is slowly rising during the shot for some reason. Next shot: no PCS changes. Jim Terry will not puff helium on this shot (He puffed from the NINJA on shots 1 and 2.) Shot 03 -- Plasma. Good shot. RF didn't work well. Density behavior didn't change. H/D=4%. Next shot: let JT turn the NINJA helium puff back on. Shot 04 -- Plasma. Disrupted at t=0.98 s. There was a thermal quench, but it began with a VDE. Steve doesn't see any evidence of pickup on any of the power supplies. Max Prf=0.97 MW. H/D=4%. Next shot: no PCS changes. Shot 05 -- Plasma. Good shot. Good RF pulse. Max Prf=1.3 MW. Still no H-mode. H/D=4-4.5%. Next shot: no PCS changes. Shot 06 -- Plasma. Good shot. Good RF pulse. Max Prf=1.8 MW. Still no H-mode. nl_04=1.2e20 m-2 during the RF. H/D=4.5%. STATE crashed while in RECOOL. Next shot: no PCS changes. Shot 07 -- Plasma. Good shot. Pretty good RF pulse. Max Prf=2.2 MW, all from J-port. Finally got some H-modes, including a long EDA. Breakdown pressure was pretty low (0.04 mTorr) due to shot-to-shot changes being made with the DNB system. H/D=5%. Next shot: no PCS changes. Shot 08 -- Plasma. Disrupted at t=0.91 s, VDE. Prf=2.4 MW. EDA H-mode. This is the second time today that the plasma went vertically unstable immediately after the RF turned off (shot 04 also did this). Breakdown pressure was still low. H/D=5%. Next shot: increase pre-fill puff to 19 ms (from 18 ms). The DNB will now fire at t=0.3 s (it was firing at t=1.4 s up until now.) Shot 09 -- Plasma. Good shot. Prf=2.6 MW. EDA H-modes. Breakdown pressure zoomed up to 0.07 mTorr, mostly due to much earlier DNB injection time. H/D=5.5%, slowly creeping up shot-to-shot. Next shot: reduce pre-fill by 2 ms (to 17 ms). Shot 10 -- Plasma. Good shot. Almost no RF power. Next shot: no PCS changes. Shot 11 -- Plasma. Disrupted at t=1.25 s. Thermal quench disruption due to a large impurity injection. Prf=2.4 MW. EDA H-mode. H/D=5.5%. Next shot: lower nl_04 by 10%. Increase argon puff by 5 ms. Shot 12 -- Plasma. Disrupted at t=0.95 s. Thermal quench disruption. Prf=2.1 MW. H-modes. H/D=6%. Bill Cochran may have identified something on the EF1 voltages that correlates with the RF. Next shot: no PCS changes. J3 will fire into a dummy load, J4 will be turned off. This is to see if there is some pickup in the supplies. Shot 13 -- Fizzle. Almost went. Null and pressure look fine. Next shot: no changes. Shot 14 -- Plasma. Disrupted at t=1.42 s. VDE. Pickup from J3 (into a dummy load) was definitely seen on EF1 signals. No RF power was injected into the plasma on this shot. Next shot: no plasma shot, just fire EF1's under hybrid control with pre-programmed currents (all in segment 1, with segment 2 turned off) to check for J4 RF pickup. Shot 15 -- Test. Due to a fault on the EF1's, this turned out to be a no EF1 power shot. Max Prf=1.5 MW. RF pickup was seen on the EF1s. Since the RF pickup can be detected on the supplies without any magnet supplied on, we're going to end the run at this time and continue looking for the RF leaks in a non-run mode. End of run. Beginning of RF leakage tests. |
| Session Leader Comments |
| Physics Operator Comments | |||
| Dec 5 2000 05:13:59:343PM | Robert Granetz | Engineering setup: ECDC in D2 overnight, ending 2 hours before the run. Power systems as on 1001205006. Gas setup: fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED fill B-side upper with 35 psi of D2 Hybrid DISABLED, for ECDC fill C-side with 30 psi of D2 Hybrid enabled leave J-bot as is Hybrid DISABLED Enable the following gate valves: ECE, VUV, Beast, DNB Run starts at 09:00 and ends at 17:00. ------------------------------------------------------------------------------- RF Setup: XMTRs 1,2,3, and 4 should be made ready by 8:00 (run-on). ------------------------------------------------------------------------------- | |
| Dec 5 2000 05:14:09:513PM | Robert Granetz | Run Plan: Further tests of J-port performance as a four-strap. Re-load a late shot from yesterday (0.8 MA, 5.3 T, NL_ZMETER). Fire J-port into plasma. During the day we may raise the density, and if everything works well, we may eventually the current. | |
| Dec 6 2000 08:31:23:857AM | Robert Granetz | After the apparent RF pickup problems in the EF1's and EF2's, it was noticed that the glow paddles were still connected, so on the off chance that this might affect RF pickup, they were disconnected after the run last evening. | |
| Dec 6 2000 08:40:14:780AM | Robert Granetz | Overnight ECDC in D2 was done. Hybrid coldstart done; no errors found PCS loaded from shot 1001205020 (using NL_ZMETER), except increased pre-fill puff from 17 to 20 ms because the DNB will not be open on the first shot. Also, I enabled the argon right from the first shot. | |
| Dec 6 2000 09:10:28:967AM | 1001206001 | Robert Granetz | Shot 01 -- Plasma. Good shot. Ip=0.8 MA, Btor=5.2 T, nl_04=0.9e20 m-2 (Yes, TCI worked on this shot, but we're using NL_ZMETER for density control.) Max Prf=1.25 MW (J3+J4). No H-mode. Null was not too good, and breakdown was real late. Gas pressure was low also. Next shot: increase Br0 offset by 0.3 mT, increase IC_EF4 by 15 A, and drop pre-fill to 18 ms (since DNB will open on the next shot). |
| Dec 6 2000 09:35:44:250AM | 1001206002 | Robert Granetz | Shot 02 -- Plasma. Good shot. Good startup. RF didn't work well. H/D is down at 3.5%. Density is slowly rising during the shot for some reason. Next shot: no PCS changes. Jim Terry will not puff helium on this shot (He puffed from the NINJA on shots 1 and 2.) |
| Dec 6 2000 09:47:26:780AM | 1001206003 | Robert Granetz | Shot 03 -- Plasma. Good shot. RF didn't work well. Density behavior didn't change. H/D=4%. Next shot: let JT turn the NINJA helium puff back on. |
| Dec 6 2000 11:45:33:607AM | 1001206004 | Robert Granetz | Shot 04 -- Plasma. Disrupted at t=0.98 s. There was a thermal quench, but it began with a VDE. Steve doesn't see any evidence of pickup on any of the power supplies. Max Prf=0.97 MW. H/D=4%. Next shot: no PCS changes. |
| Dec 6 2000 10:30:51:200AM | 1001206005 | Robert Granetz | Shot 05 -- Plasma. Good shot. Good RF pulse. Max Prf=1.3 MW. Still no H-mode. H/D=4-4.5%. Next shot: no PCS changes. |
| Dec 6 2000 10:51:38:873AM | 1001206006 | Robert Granetz | Shot 06 -- Plasma. Good shot. Good RF pulse. Max Prf=1.8 MW. Still no H-mode. nl_04=1.2e20 m-2 during the RF. H/D=4.5%. STATE crashed while in RECOOL. Next shot: no PCS changes. |
| Dec 6 2000 11:22:56:297AM | 1001206007 | Robert Granetz | Shot 07 -- Plasma. Good shot. Pretty good RF pulse. Max Prf=2.2 MW, all from J-port. Finally got some H-modes, including a long EDA. Breakdown pressure was pretty low (0.04 mTorr) due to shot-to-shot changes being made with the DNB system. H/D=5%. Next shot: no PCS changes. |
| Dec 6 2000 11:44:52:590AM | 1001206008 | Robert Granetz | Shot 08 -- Plasma. Disrupted at t=0.91 s, VDE. Prf=2.4 MW. EDA H-mode. This is the second time today that the plasma went vertically unstable immediately after the RF turned off (shot 04 also did this). Breakdown pressure was still low. H/D=5%. Next shot: increase pre-fill puff to 19 ms (from 18 ms). The DNB will now fire at t=0.3 s (it was firing at t=1.4 s up until now.) |
| Dec 6 2000 12:00:41:857PM | 1001206009 | Robert Granetz | Shot 09 -- Plasma. Good shot. Prf=2.6 MW. EDA H-modes. Breakdown pressure zoomed up to 0.07 mTorr, mostly due to much earlier DNB injection time. H/D=5.5%, slowly creeping up shot-to-shot. Next shot: reduce pre-fill by 2 ms (to 17 ms). |
| Dec 6 2000 12:16:01:810PM | 1001206010 | Robert Granetz | Shot 10 -- Plasma. Good shot. Almost no RF power. Next shot: no PCS changes. |
| Dec 6 2000 12:52:58:530PM | 1001206011 | Robert Granetz | Shot 11 -- Plasma. Disrupted at t=1.25 s. Thermal quench disruption due to a large impurity injection. Prf=2.4 MW. EDA H-mode. H/D=5.5%. Next shot: lower nl_04 by 10%. Increase argon puff by 5 ms. |
| Dec 6 2000 01:40:57:937PM | 1001206012 | Robert Granetz | Shot 12 -- Plasma. Disrupted at t=0.95 s. Thermal quench disruption. Prf=2.1 MW. H-modes. H/D=6%. Bill Cochran may have identified something on the EF1 voltages that correlates with the RF. Next shot: no PCS changes. J3 will fire into a dummy load, J4 will be turned off. This is to see if there is some pickup in the supplies. |
| Dec 6 2000 01:36:56:750PM | 1001206013 | Robert Granetz | Shot 13 -- Fizzle. Almost went. Null and pressure look fine. Next shot: no changes. |
| Dec 6 2000 01:58:06:483PM | 1001206014 | Robert Granetz | Shot 14 -- Plasma. Disrupted at t=1.42 s. VDE. Pickup from J3 (into a dummy load) was definitely seen on EF1 signals. No RF power was injected into the plasma on this shot. Next shot: fire J4 into a dummy load, and turn off J3. |
| Dec 6 2000 02:26:39:310PM | 1001206014 | Robert Granetz | Shot 14 -- Plasma. Disrupted at t=1.42 s. VDE. Pickup from J3 (into a dummy load) was definitely seen on EF1 signals. No RF power was injected into the plasma on this shot. Next shot: no plasma shot, just fire EF1's under hybrid control with pre-programmed currents (all in segment 1, with segment 2 turned off) to check for J4 RF pickup. |
| Dec 6 2000 02:39:57:950PM | 1001206015 | Robert Granetz | Shot 15 -- Test. Due to a fault on the EF1's, this turned out to be a no EF1 power shot. Max Prf=1.5 MW. RF pickup was seen on the EF1s. Since the RF pickup can be detected on the supplies without any magnet supplied on, we're going to end the run at this time and continue looking for the RF leaks in a non-run mode. End of run. Beginning of RF leakage tests. |
| Dec 6 2000 02:40:19:500PM | 1001206015 | Robert Granetz | Summary: Things were going pretty well from an RF standpoint, with J3+J4 delivering up to 2.6 MW, with H-modes, heating, and low radiated power. But there was still a problem with RF pickup screwing up some of the magnet supplies, particularly at the higher RF powers. This problem results in VDE's. The run was stopped early so that the RF leakage could be tracked down. Other than the RF pickup problems, the machine ran very well today, with excellent startup reliability (only one fizzle). |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:58:24:233AM | Plasma | Ok | |
| 2 | 09:17:37:750AM | Plasma | Ok | |
| 3 | 09:35:58:810AM | Plasma | Ok | |
| 4 | 09:53:49:763AM | Plasma | Ok | |
| 5 | 10:15:59:233AM | Plasma | Ok | |
| 6 | 10:37:24:577AM | Plasma | Ok | |
| 7 | 11:03:39:467AM | Plasma | Ok | |
| 8 | 11:25:06:357AM | Plasma | Ok | |
| 9 | 11:48:09:810AM | Plasma | Ok | |
| 10 | 12:09:53:623PM | Plasma | Ok | |
| 11 | 12:33:22:030PM | Plasma | Ok | |
| 12 | 01:04:08:170PM | Plasma | Ok | |
| 13 | 01:30:47:513PM | Plasma | Ok | |
| 14 | 01:50:32:060PM | Plasma | Ok | |
| 15 | 02:17:17:233PM | Test | Bad | EF1 Type 3 Fault was not reset before shot |