| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Jim Irby |
| Physics operator(s): | Steve Wolfe,Robert Granetz |
| Engineering operator(s): | Gary Dekow,Bill Cochran |
| Engineering Operator Run Comment |
| Complete power system tests. Begin start of plasma run. Irby/Wolfe/Cochr |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:10:147PM |
| Author: To Be Determined |
| Physop Summary for Wednesday, 3/22/2000 SL: Irby PO: wolfe/granetz EO: Cochran/Dekow MP? : Testing and Plasma startup Engineering setup: ------------------- 2 hours ECDC in D2 prior to the run, stopping 1 hour before run. Begin with setup for remaining power system tests (Cochran,Dekow) NOTE: Gas system not enabled for power tests until requested. For plasma tests: Power system setup as on 991103014 Fizzle detector from .08 to 1.7, short delay for TF Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill C-side with 30 psi of D2 Hybrid enabled fill J-bottom with 6 psi of D2 Hybrid disabled Run Plan: ------------------ Finish Power system tests, including commutation tests and hybrid-controlled double swings. If j-bot valve has been connected, test it out during power tests. Assuming no problems, begin trying for plasma, using startup from 991103014. We need to give Granetz time to fix the missing magnetics signals in order to evaluate the null. If successful in getting breakdown, evaluate cleanliness as indicated by current evolution. We may scale back the program current from 800ka to 500 or 600kA to extend pulse length Results: -------- The run got off to a very late start, due primarily to computer problems associated with the system disk getting full. We made the most of the cell access to allow Granetz to track down the problems observerd yesterday with several magnetics diagnostics signals going into the new TR16 digitizer. He determined that a number of connections on the lemo to D-connector patch panel had bad solder joints. This was repaired in situ by the electronics shop. The fizzle detector threshold was increased from 140mV to 190mV in order to prevent the spurious f.d. suppression obeserved during yesterday's TF tests (shots 23-25). Since the power systems tests were completed yesterday, we actually planned to start right off with plasma attempts. Once the computer system was re-booted for the final time, we started with a no-power (data system only) cycle. PCS was loaded from a test shot PCS_002 obtained yesterday, taken from 991103014. Some of the magnetics data failed to store, the fizzle detector did not fire, and the hybrid m-out signals looked like there was no feedback. After several additional no-power tests, and standalone test shots of hybrid and magnetics, Granetz determined that the magnetics problem was due to a power supply being left off after the resoldering job. The hybrid test shot produced reasonalble looking outputs, but additional full cycles behaved as if the gains were not being switched in, and the fizzle detector still did not go. A trip to the interface room revealed that there as an error light on the crate controller, and the J221 had not fired. The lack of j221 gates was consistent with both the fizzle detector lossage and the lack of gain switching. Josh determined that the error was being caused by a process CAMAC_CHECK on DAQA, which is used to update the web page on the camac status. He killed this process, and the subsequent full cycle (shot 1000322004) worked for both hybrid and f.d. Shot 5 was a full-up plasma attempt. The null looked reasonable, although Br was ~1mT and drifting, and the EF4 currents were slightly imbalanced. We got a flash on z-meter, CII, and h-alpha, although nothing was seen on the tv. CII level was around .006, which is slightly high but not bad for the first day. Irby noted a high (1.7uOhm) resistance on the oh2l coax. The remainder of the run was spent in no-power cycles and oh / tf shots in an effort to recover the low coax resistance we had started with. In particular, the oh's were fired under PLC control on the reverse bridges with a normal tf pulse to reverse the jXB forces on the coax. Following shot 9 the resistance had reduced to 0.8uOhm. There were no further plasma attempts. We did not test the j-bot piezo valve, mainly because we forgot it. Josh and Ian discovered that the reason the FLUXIHH analysis job was failing was related to the fact that the new tr16 was not set up to take the same number of samples of magnetics data as the traq it replaced, while Ian's program assumed that all of the magnetics signals had the same length. Granetz modified the tree to take 12,288 samples in the tr16 to match the traq data, solving this problem. Josh *who was kept very busy today, also fixed a bug in the engineering power supply control widget related to differences between IDL5.2 on the alphas and IDL 5.0 on the Vaxen. The main goals for this week, completion of power testing and integrated system tests have been achieved. Production of a breakdown, albeit a fizzle, on the first attempt at plasma is an indication that the overal system is in good shape. The rest of the week will be devoted to preparation for plasma runs next week, including continuing work on the DNB and RF systems. Scorecard: ---------- Duds 0 Tests 8 Fizzles 1 Plasmas 0 ======= = shots 9 |
| Session Leader Comments |
| Physics Operator Comments | |||
| Mar 22 2000 06:34:49:467AM | Steve Wolfe | Queue manager is hung up. Tom and Josh notified by voice mail. Try doing a coldstart anyway It runs, all matrices respond | |
| Mar 22 2000 10:25:55:590AM | Steve Wolfe | Adjusted threshold on fizzle detector from .141 to .190V, as indicated on lemo connector marked THR-> (bottom one) (turned pot between 1/4 and 1/2 turn clockwise.) The idea is to keep it from thinking there is current during tf tests because of combination of offsets and tf pickup on rogowski, as noted on shots #23-25 yesterday. | |
| Mar 22 2000 01:26:23:390PM | Steve Wolfe | Computers finally back up after being down all morning. Load from shot #2 (based on 991103014) do another coldstart coldstart successful. | |
| Mar 22 2000 02:18:45:640PM | 1000322001 | Steve Wolfe | shot#1 - No power test; camac only. Data looks bad. No fizzle signal. Hybrid outputs look like pre-programmed, no feedback. Take a hybrid test shot (004). It looks ok. |
| Mar 22 2000 02:41:09:950PM | 1000322002 | Steve Wolfe | shot#1 - No power test; camac only. Data looks bad. No fizzle signal. Hybrid outputs look like pre-programmed, no feedback. Take a hybrid test shot (004). It looks ok. |
| Mar 22 2000 02:43:23:500PM | 1000322002 | Steve Wolfe | shot#2 - No power test; camac only. Looks the same. Bob left the integrator power supply off. Magnetics is screwy, but I don''t think that accounts for the hybrid signals behavior. Reload the pcs model, just to be sure. This doesn''t make sense! |
| Mar 22 2000 03:39:52:043PM | 1000322003 | Steve Wolfe | shot#3- No power test; camac only. same thing! There is an error light on the camac. Josh discovered that the camac_check process was causing an error on the hybrid crate, causing the j221 to disarm. We watched it come in about once a minyte Josh killed the process on daqa. Try again. |
| Mar 22 2000 03:49:42:890PM | 1000322004 | Steve Wolfe | shot#4- No power test; camac only. That worked! Fd went as well. It was the camac_check job. Next shot: try for plasma. |
| Mar 22 2000 04:03:42:450PM | 1000322005 | Steve Wolfe | shot#5- try for plasma. Fizzle detector worked anyway. Got small flash on CII, halpha Nothing on TV. Maybe a tiny current. EF4 has a current imnbalance; not dead cold. Br and Bz don''t look bad, null looks ok. fill is at .085, a little high but it gives a flash. Just try it again |
| Mar 22 2000 04:16:10:467PM | 1000322006 | Steve Wolfe | shot#6- 10ka oh test only; check on oh2l coax resistance. oh resistance is still up. Next shot: tf + reverse bridge oh |
| Mar 22 2000 04:25:51:687PM | 1000322007 | Steve Wolfe | shot#7- no power test |
| Mar 22 2000 05:04:50:827PM | 1000322008 | Steve Wolfe | (Granetz taking over at Steve''s console. All of Steve''s logbook comments for the remainder of today are actually by Granetz.) shot#8- no-power shot cycle test |
| Mar 22 2000 05:12:35:187PM | 1000322009 | Steve Wolfe | shot#9- OH and TF test of coax resistance. OH1, OH2L, OH2U have negative current, TF has positive current. OH2''s have noticeable 60 Hz noise on them. The OH2L coax resistance dropped back down to 0.8 micro-ohms by the end of the pulse. End of today''s run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 02:04:18:077PM | Test | Ok | No power test only |
| 2 | 02:25:59:810PM | Test | Bad | No Power Test Shot |
| 3 | 03:10:04:217PM | Test | Ok | No Power Test only |
| 4 | 03:40:31:420PM | Test | Ok | No Power Test Only |
| 5 | 03:51:08:763PM | Plasma | Ok | Full Power System Shot |
| 6 | 04:09:14:687PM | Test | Ok | OH Coax Test |
| 7 | 04:22:30:327PM | Test | Bad | shot cancelled |
| 8 | 04:40:22:170PM | Test | Ok | no power test shot only |
| 9 | 05:04:14:043PM | Test | Ok | OH Coax Test |