| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Steve Golovato |
| Physics operator(s): | Unknown |
| Engineering operator(s): | Unknown |
| Engineering Operator Run Comment |
| TF tests; if successful, then plasma attempts |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Physics Operator Summaries |
| Session Leader Comments | |||
| May 5 1993 02:57:46:030PM | Steve Golovato |
13.8 problem isolated to EF3 supply, noise identified as arcing only occurred with EF3 connected to the 13.8, but before the DC side is turned on. Listening at all power room doors indicates that the sound (clicking) is loudest toward the cell, not toward the street where the EF3 supply is located. Will do a few more TF test shots and then stop to further investigate problem. | |
| May 5 1993 03:32:21:160PM | Steve Golovato |
Ran another EF3 test to "listen" with AM radio. No noise heard by radio nor by human "listeners". Seems to have gone away. So we're going back to running with all systems, at least until the noise comes back. | |
| May 5 1993 04:04:30:840PM | Steve Golovato |
Problem fixed. Soleniod driven by solid-state relay which was being switched by electrical noise presumably generated by EF3 supply. | |
| May 5 1993 09:22:00:250AM | 930505001 | Steve Golovato | TF test. 30 kA, ~1.3 T. Two TF cabinets operational.
Got 30 kA, pulse not long enough. |
| May 5 1993 09:43:46:510AM | 930505001 | Steve Golovato | Same shot as 1, longer pulse.
Panic button hit near end of pulse, machine operator wasn't informed of longer pulse. Got 56 kA, 2 T. 10 minute halt to change commutation resistors and look at TF supplies. |
| May 5 1993 09:46:52:950AM | 930505002 | Steve Golovato | Previous entry was for shot 930505002, not 930505001.
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| May 5 1993 10:58:11:300AM | 930505003 | Steve Golovato |
All magnet supplies turned on (except EF2, EFC) using Wolfe's voltage waveforms (PCS mode 1011). OH2 commutation resistor 0.032. No feedback. TF still at reduced level. Gas fill on at 4 X 10-5. Everything ran. OH2 strange after commutation. EF1 voltage low. |
| May 5 1993 11:13:13:300AM | 930505004 | Steve Golovato |
TF to 100 kA. Feedback on for EF1U&L current. EF1 voltage waveform changed, started earlier to get up to desired current. Hybrid changes did not get in for this shot. Load still occurring when state went into init. Shot screwed up, likely because hybrid not loaded correctly. Only TF ran and it crowbarred. |
| May 5 1993 11:19:28:820AM | 930505004 | Steve Golovato |
Wavegen did not get start trigger, no program to any coil. Cold start of hybrid done just in case. |
| May 5 1993 11:39:14:540AM | 930505005 | Steve Golovato |
Repeat of last shot, hopefully with everything working. TF crowbarred. Alternator tripped early, all currents start down at -0.3 sec. Still not getting desired current in EF1. |
| May 5 1993 11:57:36:610AM | 930505006 | Steve Golovato |
Got 3.5 T TF last shot. EF1 PS overpowered by close coupling to OH, cannot get to desired current. EF1U&L started earlier (-1.2 sec), run flat out early. Pulsed gas 50 V for 40 ms (was 40 V last shot) at 0.5 sec Shot aborted. Apparently 13.8 arcing. |
| May 5 1993 03:21:52:620PM | 930505006 | Steve Golovato | TF only, set for 100 kA.
Got 98 kA (3.4 T), supply crowbarred. Using AM radio to "listen" for arcing, got no pickup (EF3 off). |
| May 5 1993 03:51:17:610PM | 930505007 | Steve Golovato | No gas. Sound back, faster, sounds more like a relay than an arc and
more definitely on cell side of power room. No noise on radio. Shot aborted. No data. |
| May 5 1993 04:13:28:660PM | 930505007 | Steve Golovato |
All on, including gas. TF crowbarred. Gas pre-fill 4 X10-5, pulse 30 V for 40 ms at 0.5 sec. EF1 still low. This time because alternator tripped at -0.4 sec because of TF crowbar. |
| May 5 1993 04:52:07:250PM | 930505008 | Steve Golovato | TF crowbarred. Wavegen didn't fire, but had matrix switching. No demands
on PF supplies. Not clear why. |
| May 5 1993 04:53:36:440PM | 930505008 | Steve Golovato |
Gas to 40 V. Delay to enter cell, check on LN2 pump,which shut down. |
| May 5 1993 05:08:40:290PM | 930505009 | Steve Golovato |
TF set to 50 kA, regulated, then crowbared at the end. Hybrid ran. |
| May 5 1993 05:18:11:830PM | 930505009 | Steve Golovato |
EF1L crowbarred. |
| May 5 1993 09:01:50:710AM | 930505029 | Steve Golovato | Base pressure high ~10-7 torr.
Commutation resistors: OH1 0.127 Ohm OH2U&L 0.069 EF1U&L 0.205 |
| May 5 1993 09:05:51:160AM | 930505029 | Steve Golovato | #2 5-MAY-1993 08:44:55.04 NEWMAIL
OH1, OH2U&L, EF1U&L and EF4: ON= -.60 sec CLOSE= -.55 OPEN= 0. (OH1,OH2U&L,EF1U&L only) CROWBAR=0.030 (OH1,OH2U&L,EF1U&L only) INVERT= 0.250 EF3: ON= anytime before -.050 sec INVERT= +.250 EF2U&L each have ballast resistor = 35e-3 Ohm (not critical) ON= anytime before 0.0 sec CLOSE= 0.030 INVERT=0.250 PLC current limits at or above drawn waveforms, eg OH1 22kA OH2U&L 17kA EF1U&L 12kA EF2U&L 5kA EF3 12kA (supply current) EF4 4kA The plasma is assumed to breakdown at 0.020 sec, and rise at 1.e6 A/sec. |
| Physics Operator Comments |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:09:52:870AM | Test | Ok | TF pulse; 30 kA with no flat top, some question about high tap gates |
| 2 | 09:23:34:970AM | Test | Ok | 55 kA TF; no high tap gates |
| 3 | 10:26:49:420AM | Test | Bad | All power supplies except EF2U&L and EFC; Commutation Failure on OH2L |
| 4 | 10:59:44:960AM | Test | Bad | TF Crowbar due to IOC setpoint error |
| 5 | 11:21:04:480AM | Plasma | Bad | TF crowbar at inversion; -.1 seconds; set to +.1 seconds for next shot |
| 6 | 11:51:58:290AM | Test | Bad | TF crowbar at begining of flat top |
| 7 | 03:40:41:230PM | Plasma | Bad | TF crowbar at 70 kA; found 1 TF cabinet gate drives off |
| 8 | 04:37:18:030PM | Plasma | Bad | TF Crobar at 60 ka |
| 9 | 04:59:51:450PM | Plasma | Bad | 50 kA TF OK, PF tripped on commutation failure |