| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Joseph Snipes |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Unknown |
| Engineering Operator Run Comment |
| Power Supply and feedback test |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:06:460PM |
| Author: To Be Determined |
| Run summary for 04 May 1993: ---------------------------------------------------------------------------- OH2U&L were run under hybrid pre-programmed voltage control. Both supplies responded properly. OH2U&L were commutated and crowbarred successfully. OH2L switch would not close on several shots, causing the supply to fire into the commutation resister. OH2L bus rogowski is inverted. EF4 was run under hybrid pre-programmed voltage control, and then under hybrid feedback control of the bus current at several PID gains. These tests were satisfactorily completed. To achieve errors which are less than 10% of demand, it is clear that the voltage pre-programming has to be fairly consistent with the current demand. EF4 coil polarity is now correct (after being changed on Saturday). EF4L bus rogowski is inverted. EF4U bus rogowski was dead (repaired 10 min. after run ended; simple reconnect) EF2's were run for one shot to test bus rogowskis. They both worked and both had correct polarity. Hybrid pulsed-gas voltage programming successfully appears at the piezo valve. Run was stopped early to permit continuing repairs to the TF supplies. No TF shots were run. **************** Power supply problems to be worked on: ******************** OH2L: SCR switch must be fixed so that it closes reliably at beginning of every shot. TF: replace boards, continue work on crowbar problems |
| Physics Operator Summaries |
| Session Leader Comments | |||
| May 4 1993 10:19:05:630AM | Joseph Snipes | Josh Test
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| May 4 1993 10:20:34:520AM | Joseph Snipes | Run Plan, Tuesday morning, May 4:
Priorities (1=highest). Each item on the list requires several shots; the last shot of each sequence is described below. 1 Test OH2 commutation, hybrid control. Last shot -- feedback on current at 10 KA., commutation (Granetz 2d). Leave on for subsequent shots. 2 Verify TF crowbar problem is fixed. If so, leave on for subsequent shots at 2.0 T. Only one cabinet is modified so we can't get 4 T. (Miniproposal P 9) If crowbar problem persists, turn off? 3 EF4 under hybrid control. Last shot - feedback on current at 1500 A. (Miniproposal P 11) up to t=0. Then switch gain to zero, let preprogrammed voltage remove the current. | |
| May 4 1993 10:21:30:370AM | Joseph Snipes | Run Plan, Tuesday morning, May 4: continued
4 EF3 under hybrid control. Feedback on Bz at -.1 T. starting after t=0. Since it will be fighting ef4, this should require - 3000 A or so. (Miniproposal P 11) Note: While subsequent testing is going on, set up the hybrid to switch the controller for Bz from EF4 to EF3 at t=0. The drawn Bz switches from +.1 T to near zero at t=0. (Wolfe -- control Bz with EF4 before commutation, EF3 after.) As we add and vary other systems, observe B_z and tweak gains. Objective is to use EF3 to push B_z to zero at t=0 and hold it there. | |
| May 4 1993 10:22:09:850AM | Joseph Snipes | 5 There are several lower priority tests -- mostly "re-tests" which
will be done as we continue configuring the fields for plasma. a) EF1,OH1 commutation test; leave on and tweak fields. b) Gas system. Run and debug. As the run proceeds, try to evolve the currents and voltages towards a breakdown scenario. | |
| May 4 1993 11:00:43:210AM | Joseph Snipes | SHOT 1
OH2 commutation test start at -0.8, switch at -0.75, commutate at t=0, invert at 0.25 s. 36 mohm commutation resistance, no crowbar. 10 kA current limit. Both OH2 coils fired at once. | |
| May 4 1993 11:04:20:760AM | Joseph Snipes | Shot 1
Self power circuit fired on OH1 because of overvoltage above 1 kV | |
| May 4 1993 11:06:37:590AM | 930504002 | Joseph Snipes | Shot 2
Drop current limit on OH2 to 8 kA to prevent overvoltage induced on OH1 |
| May 4 1993 11:10:12:810AM | 930504002 | Joseph Snipes | Shot 2
Drop current limit on OH2 to 8 kA to prevent overvoltage induced on OH1 Clean shot at about 11 kA in OH2. No overvoltage on OH1. |
| May 4 1993 11:31:52:290AM | 930504003 | Joseph Snipes | Shot 3
Test voltage programming with Hybrid control. Close switch (crowbar) at +10 ms. Waveforms are Wolfe's 1011 reduced by a factor of about 3. Current limits same as Shot 2. Hybrid programming got through. OH2 lower switch did not close. OH2 upper looks O.K. |
| May 4 1993 11:45:28:300AM | 930504003 | Joseph Snipes | Shot 4
Granetz taking over. Same as shot 3 except changed programming for Pulse_gas_2. OH2 upper current still significantly greater than lower. |
| May 4 1993 11:56:25:510AM | 930504004 | Joseph Snipes | Before Shot 5
Reduce voltage programming amplitude by a factor of 2 for OH2 upper. |
| May 4 1993 11:58:51:230AM | 930504005 | Joseph Snipes | After Shot 5
Voltage programming on OH2 upper and lower NOT working. |
| May 4 1993 12:36:43:060PM | 930504005 | Joseph Snipes | After Shot 5
Hybrid voltage programming was a staircase. M_OUT confirms staircase came out of hybrid. However, PS demands seemed to be from Shot 4. Next shot test PLC voltage control. |
| May 4 1993 12:17:58:020PM | 930504006 | Joseph Snipes | Before Shot 6
Test OH2 U & L with PLC voltage control. EF4 on with 1 kA limit.No commutation, no crowbar. Voltages set to zero on all except OH2 U & L and Pulse_gas. |
| May 4 1993 12:39:17:500PM | 930504006 | Joseph Snipes | After Shot 6
PLC set for 50 V limit on both OH2 U & L. Seems to have worked except voltage on OH2L was exactly half of OH2U (25 V on OH2L and 50 V on OH2U). |
| May 4 1993 12:45:18:080PM | 930504006 | Joseph Snipes | After Shot 6
PLC set for 50 V limit on both OH2 U & L. Seems to have worked except voltage on OH2L was exactly half of OH2U (25 V on OH2L and 50 V on OH2U). Internal power supply voltage diagnostic on OH2L was half of true value (we think!). |
| May 4 1993 12:50:49:060PM | 930504006 | Joseph Snipes | Before Shot 7
OH2's turned back on Hybrid voltage control. Voltage staircase unchanged on Shot 5. EF4 should have been on Shot 6 but failed. Trying again. |
| May 4 1993 01:08:09:040PM | 930504007 | Joseph Snipes | After Shot 7
Hybrid voltage programming worked. PS voltages were correct except for previously mentioned factor of two. However, OH2L appeared to fire through commutation resistor. EF4 worked, but EF4 upper buss rogowski dead. |
| May 4 1993 01:17:20:060PM | 930504007 | Joseph Snipes | After Shot 7
Lots of data not acquired for some reason despite Action Monitor saying all modules INIT'ed with no errors. |
| May 4 1993 01:10:23:780PM | 930504008 | Joseph Snipes | Before Shot 8
Add commutation and crowbar to OH2's and put EF4 under Hybrid voltage control. |
| May 4 1993 01:27:31:350PM | 930504008 | Joseph Snipes | After Shot 8
OH2L switch did not close again. Commutation worked O.K. on OH2U. EF4 voltage seems to have worked at low voltage. |
| May 4 1993 01:37:43:000PM | 930504009 | Joseph Snipes | Before Shot 9
Raising voltage on EF4 and adding 'front porch'. OH2's turned off due to switch closing problem on OH2L. Firing EF4 only will allow confirmation of coil polarity and bus rogowski polarity. 3 kA limit set on EF4. |
| May 4 1993 01:42:08:140PM | 930504009 | Joseph Snipes | After Shot 9
Hybrid voltage programming of EF4 successful. EF4L bus rogowski is inverted and EF4U rogowski remains dead. |
| May 4 1993 01:53:22:660PM | 930504010 | Joseph Snipes | Before Shot 10
Current programming and feedback of EF4 with current waveform from previous shot, but voltage waveform changed slightly to see some effective feedback. |
| May 4 1993 02:02:56:460PM | 930504010 | Joseph Snipes | After Shot 10
Feedback seems to have worked on EF4 but not enough gain and not enough difference between voltage and current programming. |
| May 4 1993 02:05:38:050PM | 930504011 | Joseph Snipes | Before Shot 11
More square shaped current demand on EF4 and proportional gain set to 2.58. |
| May 4 1993 02:12:05:160PM | 930504011 | Joseph Snipes | After Shot 11
Feedback on EF4 O.K. but gain too low since requested voltage is so high. |
| May 4 1993 02:18:12:390PM | 930504012 | Joseph Snipes | Before Shot 12
Voltage waveform for EF4 reduced. Proportional current gain set to 6.0. Pulse gas programming changed so that it has 25 V pedestal for 2 s and then 40 V for 20 ms. |
| May 4 1993 02:24:12:100PM | 930504012 | Joseph Snipes | After Shot 12
Torvac faulted so that there was no Pulse_gas.EF4 feedback worked fine. EF4 testing concluded successfully. |
| May 4 1993 02:27:55:340PM | 930504013 | Joseph Snipes | Shot 13
Test of EF2's under PLC control to check bus rogowski's. Both rogowski's worked fine with correct polarity. |
| May 4 1993 02:29:13:110PM | 930504013 | Joseph Snipes | Shot 13
End of run to repair TF supplies and OH2L switch and various bus diagnostics. |
| Physics Operator Comments |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 2 | 11:04:50:510AM | Test | Ok | shot ok good commutation |
| 3 | 11:17:04:930AM | Test | Ok | Good shot ;commutation & C-bar oh2 l switch ndid not fire |
| 4 | 11:33:25:330AM | Test | Ok | oh2u might not be volt regulating |
| 5 | 11:50:38:810AM | Test | Bad | Power supplies are not operating on hybrid control |
| 6 | 12:16:43:770PM | Test | Ok | Checking V deviders OH2 |
| 7 | 12:46:43:880PM | Test | Bad | EF4 and both OH2's; no magnetics data, one OH2 questionable |
| 8 | 01:09:30:900PM | Test | Bad | OH2L switch did not close; 2nd shot in a row |
| 9 | 01:36:14:070PM | Test | Ok | EF4 only under hybrid control; worked fine |
| 10 | 01:52:01:030PM | Test | Ok | EF4 hybrid control trying for current feedback |
| 11 | 02:03:46:120PM | Test | Ok | ef4 only |
| 12 | 02:16:38:740PM | Test | Ok | EF4 under hybrid control; attempting current feedback |
| 13 | 02:22:56:480PM | Test | Ok | ef2 test; worked fine |
| 14 | 03:25:59:620PM | Test | Bad | testing trigger oh1; did not fire |
| 15 | 03:39:41:000PM | Test | Ok | Test of OH2U switch trigger OK |
| 16 | 03:47:18:570PM | Test | Ok | ;ljkraasdjkl;dfzs |
| 17 | 03:55:31:210PM | Test | Bad | no camac! |
| 18 | 04:04:48:670PM | Test | Bad | Camac crates 3 and 8 were off-line; don't know why |
| 19 | 04:18:26:440PM | Test | Ok | oh2u switch fired! |
| 20 | 04:22:21:500PM | Test | Bad | OH2L switch did not fire |
| 21 | 05:03:08:560PM | Test | Bad | jorway 222 buffer appears bad |
| 22 | 05:23:16:980PM | Test | Ok | OH2L switch fired with new jorway j222 |
| 23 | 05:27:07:710PM | Test | Bad | oh2 supplies did not pulse |
| 24 | 05:30:46:050PM | Test | Ok | Both OH2 supplies pulsed OK |
| 25 | 06:55:48:890PM | Test | Bad | test of oh2 volt trace; camac did not trigger |
| 26 | 07:02:32:810PM | Test | Bad | no camac triggers! |
| 27 | 07:08:54:930PM | Test | Bad | same no trig |
| 28 | 07:13:38:820PM | Test | Ok | voltage divider test |
| 29 | 07:33:37:410PM | Test | Ok | oh2 l8212 input 05 bad; factor of 2 divide internal |