Miniproposals

Miniproposal: 214 Date Filed: 1/5/1999 Title: D and E-port RF System Commissioning First Author: Steve Wukitch Session Leader: Steve Wukitch (shots 1-21)

Engineering Operator Run Comment

MP 214 RF Conditioning/Goetz, Silva

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:20:960PM

Author: To Be Determined

Run Summary for 990723 EO: Silva, Cochran, Dekow PO: Goetz SL: Wukitch Run 990723 was in support of MP 214 -- RF conditioning. To this end, attempts were made to produce plasmas so that the RF group could get all four antennas operational. ===================================================== . Plasma conditioning FMIT#1, #2, #3, #4 ===================================================== Shot# 001 fizzle 002 fizzle 003 EDA plasma . FMIT#1 600 kW . FMIT#2 1.4 MW . FMIT#3 - off . FMIT#4 120 kW forward (20 kW net) 004 plasma . FMIT#1 600 kW . FMIT#2 1.4 MW - overload . FMIT#3 - off . FMIT#4 80 kW forward (4 kW net) 005 fizzle 006 plasma . FMIT#1 600 kW . FMIT#2 1.4 MW - overload . FMIT#3 - 15 kw forward (5 kW net) . FMIT#4 100 kW forward (33 kW net) 007 plasma . FMIT#1 600 kW . FMIT#2 1.4 MW - overload . FMIT#3 - 60 kw forward (5 kW net) . FMIT#4 100 kW forward (60 kW net) 008 plasma . FMIT#1 600 kW . FMIT#2 off . FMIT#3 - 100 kw forward (<10 kW net) . FMIT#4 150 kW - lots of little arcs 009 plasma . FMIT#1 600 kW (lower during H-mode) . FMIT#2 1.2 MW . FMIT#3 - ramp to 600 kW . FMIT#4 150 kW still arcing 010 plasma . FMIT#1 600 kW (lower during H-mode) . FMIT#2 1.2 MW . FMIT#3 - ramped to 400 kW . FMIT#4 100 kW still arcing 011 plasma . FMIT#1 600 kW (lower during H-mode) . FMIT#2 1.2 MW . FMIT#3 - ramped to 400 kW . FMIT#4 100 kW still arcing next shot: overlap #3 with #1 and #2 012 OH2 lower xbar 013 fizzle 014 OH1 016 017 fizzle 018 early disruption 019 early disruption Summary: Good progress was made in conditioning D and E-port antennas. FMIT#1 and #2 worked up to their operational limits. FMIT#1 is limited to between 600 - 800 kW because of its 1 MW plate dissipation limitation. FMIT#2 was tested up to 1.4 MW into dummy load without overloading, essentially the transmitter is acting like a voltage limited supply. Into plasma, reflected power can abruptly cause an overload condition. For example 990723003, 1.4 MW was injected into the plasma; however, on the following discharges, the transmitter overloaded at the L->H transition. More reliable operation was achieved at 1.2 MW. Until the anode voltage can be raised, the reliable power will be limited to 1.2 MW. The first significant power from J-port was obtained as well. Power ramps upto 600 kW were obtained from FMIT#3 and upto 150 kW from FMIT#4. More conditioning effort is required to increase the output power and run them simultaneously.

Physics Operator Summaries

Entered: Jul 7 2004 04:37:07:473PM

Author: To Be Determined

Physics operator summary for 990723 EO: Silva, Cochran, Dekow PO: Goetz SL: Wukitch Run 990723 was in support of MP 214 -- RF conditioning. To this end, attempts were made to produce plasmas so that the RF group could get all four antennas operational. It was the best of runs, it was the worst of runs... This run proves without a doubt that the sparker is a good thing. There were no non-power supply duds during today's run. This is in contrast to the three previous runs which were filled with duds that had nice-looking nulls. It was determined before the run that the sparker was not connected. A detailed analysis of runs 990716, 990721, 990722 showed that the sparker was not firing into the vacuum chamber during these runs. Physics operators should familiarize themselves with the "sparker scope" and how to interpret it. If ever the sparker does not work, the "high- prefill" startup developed on 990722017 should be used. The run began with the "high-prefill" startup and it took a few shots to get the prefill pressure and fields correct. Then a string of six full-length shots were produced. The RF group was able to get all four transmitters transmitting into plasma. See the Session Leader's summary for more details. After this though, the run turned ugly. A OH2 power supply failure was followed by a string of plasmas, with some fizzles tossed in, none of which lasted longer than 0.42s (none made it to OH1 crossover). Many things were tried to get past this early disruption including: slowing down CLEARIN, speeding up CLEARIN, slowing down ZCUR, moving RXL out early, holding ZXL up, loading a good shot from 990723, and loading a good segment 2 from 990420009. None of these changes seemed to help at all. In fact, the last two shots had copious amounts of hard x-rays and disrupted right after segment switch. These disruptions remain unexplained. Something happened after the OH2 power supply fault, but I know not what. Engineering, computing, and diagnostics today: The overnight ECDC was stopped on a PEI trip last night at about 10:00P.M. It was determined that the sparker was not connected. Analysis of previous runs shows that it wasn't connected for 990716, 990721, and 990722. A thermocouple module died between shots 2 and 3 which caused the vessel to heat up briefly. The OH2L received a spurious signal and crowbarred before the pulse on one shot. Scorecard: 21 shots = 15 plasmas + 5 fizzles + 1 duds + 0 tests Shot summary for Run 990723: Load 990722017 with no changes coldstart hybrid - everything loaded; all matrices respond Shot change result ____ _____ ______ 1 see above fizzle; b.d. @ .006; null good; fill too high - sparker ran 2 PG4=22ms fizzle; strong one; b.d. @ .005; hit something @ .014 3 IC_EF4=-1285A; PG4=24ms plasma; b.d. @ .005; good current rise 4 raise ZXL a bit plasma; b.d. @ .0055; good current rise; still a slot 5 raise ZXL a bit more fizzle; weak; lots of CII light; never burns out 6 PG4=21ms; enable PG1 plasma; b.d. @ .0055; good current rise; still slot divertor 7 move RXL out 2mm plasma; b.d. @ .0055; good current rise; 8 move RXL out 2mm plasma; slight hesitation; b.d. @ .0055 9 PG4=22ms plasma; b.d. @ .005; good current rise 10 PG4=20ms; PG1=25ms plasma; b.d. @ .005; good current rise 11 disable PG1 plasma; b.d. @ .005; good current rise 12 no changes dud; power supply faults @ -0.65s 13 no changes plasma; b.d. @ .006; o.k. current rise; injection @ 0.34; disruption @ 0.377 14 slow down initial CLEARIN ramp plasma; b.d. @ .006; o.k. current rise; injection @ .39; disruption @ 0.42 15 speed-up initial CLEARIN ramp plasma; b.d. @ .006; o.k. current rise; injection @ .19; disruption @ .21 16 reload 990723011 fizzle; b.d. @ .005; bounces two times; null looks o.k.; 17 PG4=22ms; raise RCUR @ 0.25s fizzle; b.d. @ .006; bounces once; maybe a little too much Bz? 18 ICEF4=-1275A; PG4=23ms plasma; b.d. @ .006; good current rise; trouble @ 0.17s; disrupts @ .33s 19 slow down ZXL betw. 0.1 and 0.5 plasma; b.d. @ .006; good current rise; trouble @ .31s; disrupts @ .38s 20 slow down ZCUR drop; move RXL plasma; b.d. @ .006; good current rise; out earlier and increase the trouble @ .05 with hard x-rays; dump gain @ .12 with disruption @ .16s 21 load seg. 2 from 990420009; plasma; b.d. @ .006; good current rise; straighten out ZCUR waveform trouble @ .145; disrupts @ .155s

Session Leader Comments
Jul 23 1999 07:27:54:110AM		Steve Wukitch	Run Plan Transmitters 1 and 2 are coming up nicely, although they may reach their current limit soon. We will pulse them together and improve tuning as we go to get a good, solid pulse. Transmitters 3 and 4 are responding reasonably well and we will bring power on those as we gain better understanding on coupling. When we get good power we will overlap them, and eventually add them to 1 and 2. Reproducible plasmas (!), with minor position (gap and height) adjustments.
Jul 23 1999 11:03:23:700AM	990723003	Steve Wukitch	Nice EDA Tranmistters 1 and 2 (D and E) went in nicely for the H mode, total of nearly 2MW. That's basically the maximum achievable in the present situation for 1 and 2. Transmitter 4 was also on later in the shot but still very low power in machine, still attempting to get a good match. 3 not on yet.
Jul 23 1999 11:04:14:280AM	990723004	Steve Wukitch	Transmitter 2 (E) tripped, we asked for too much. Back down for the next shot. 4 still not a good match. Turn 3 on for next shot.
Jul 23 1999 11:55:35:200AM	990723006	Steve Wukitch	Transmitter 2 (E) tripped, we asked for too much, the H mode pushed it over its power limit. Back down for the next shot. Transmitter 1 at maximum 600kW, happy :). 4 still not a good match. 3 went in the machine, at very low level. Trying to match them to plasma.
Jul 23 1999 12:29:19:250PM	990723007	Steve Wukitch	Transmitter 2 (E) tripped, we asked for too much (again), the H mode pushed it over its power limit. Back down for the next shot. Transmitter 1 at maximum 600kW, happy :). 4 getting better. 3 went in the machine, at slightly more in. Trying to match them to plasma.
Jul 23 1999 12:33:49:403PM	990723008	Steve Wukitch	Transmitter 2 (E) was accidently not enabled. Transmitter 1 at maximum 600kW, happy :). 4 getting better, measurable power in plasma. 3 went in the machine, at slightly more in. Trying to match them to plasma. \RF_POWER_NET is not perfect yet! J3 and J4 are not added properly in the tree. (Time base is wrong for J power) We will fix that probably on monday, we have to modify a procedure in the tree.
Jul 23 1999 12:53:35:217PM	990723009	Steve Wukitch	Transmitter 2 (E) at maximum 1.2 MW, happy :). Transmitter 1 at maximum 600kW, happy :). 4 mistuned. 3 went in the machine, 0.5MW at end!. Trying to match them to plasma. \RF_POWER_NET is not perfect yet! J3 and J4 are not added properly in the tree. (Time base is wrong for J power) We will fix that probably on monday, we have to modify a procedure in the tree.
Jul 23 1999 01:18:02:187PM	990723010	Steve Wukitch	Transmitter 2 (E) at maximum 1.2 MW, happy :). Transmitter 1 (D) at maximum 600kW, happy :). 4 mistuned. 3 went in the machine, 0.5MW at end!. Trying to match them to plasma, small arcing on antenna side. \RF_POWER_NET is not perfect yet! J3 and J4 are not added properly in the tree. (Time base is wrong for J power) We will fix that probably on monday, we have to modify a procedure in the tree.
Jul 23 1999 01:38:53:090PM	990723010	Steve Wukitch	Transmitter 2 (E) at maximum 1.2 MW, happy :). Transmitter 1 (D) at maximum 600kW, happy :). shorter length to give some room for 3 and 4. 4 mistuned. 3 went in the machine, 0.5MW at end!. Trying to match them to plasma, small arcing on antenna side. Stretched them a little.

Physics Operator Comments
Jul 23 1999 08:27:07:903AM		John Goetz	Run Plan for 990723: MP 214 -- RF conditioning Start by loading 990722017 and make changes in equilibrium as necessary to satisfy the RF group. The overnight ECDC was stopped on a PEI trip last night at about 10:00P.M. It was determined that the sparker was not completely connected. It has been connected and this run will be go a long way toward determining the utility of the sparker.
Jul 23 1999 09:22:25:700AM	990723001	John Goetz	For 990723001: load 990722017 Results: fizzle breakdown @ .006s slow rise on D-alpha and CII -> fill pressure too high sparker ran on this shot
Jul 23 1999 09:39:12:047AM	990723002	John Goetz	For 990723002: prefill PG4 = 22ms Results: fizzle breakdown @ .005s this was a bouncer - hit something @ .014s
Jul 23 1999 10:26:10:860AM	990723003	John Goetz	For 990723003: prefill PG4 = 24ms ICEF4 = -1285A (was -1300A) to get Bz in sooner to catch the plasmoid thermocouple module failed between shots 2 and 3 causing a brief vessel warmup Results: plasma breakdown @ .005s - good current rise acceptable target plasma for the RF
Jul 23 1999 10:45:58:780AM	990723004	John Goetz	For 990723004: bring the x-point up a little bit; the outer strike point is in the slot Results: plasma breakdown @ .0055s - good current rise acceptable target plasma for the RF, but #2 overvoltage outer strike in the slot until 0.8s
Jul 23 1999 11:09:57:610AM	990723005	John Goetz	For 990723005: bring the x-point up a little bit more Results: fizzle breakdown @ .006s weak fizzle with lots of carbon II light, never really burns out
Jul 23 1999 11:38:54:153AM	990723006	John Goetz	For 990723006: PG4 = 21ms bring the x-point up a little bit more Results: plasma breakdown @ .0055s; CII light back down good current rise nice target plasma although the strike point is in the slot until 0.75s
Jul 23 1999 12:03:00:577PM	990723007	John Goetz	For 990723007: move the x-point out 2mm Results: plasma breakdown @ .0055s good current rise nice target plasma although the strike point is in the slot until 0.75s
Jul 23 1999 12:28:29:153PM	990723008	John Goetz	For 990723008: move the x-point out 2mm Results: plasma breakdown @ .0055s slight hesitation in current rise nice target plasma
Jul 23 1999 12:49:25:763PM	990723009	John Goetz	For 990723009: PG4 = 22ms Results: plasma breakdown @ .005s better current rise nice target plasma
Jul 23 1999 01:09:45:187PM	990723010	John Goetz	For 990723010: PG4 = 20ms PG1 = 25ms Results: plasma breakdown @ .005s good current rise nice target plasma
Jul 23 1999 01:32:39:593PM	990723011	John Goetz	For 990723011: turn-off PG1 Results: plasma breakdown @ .005s good current rise nice target plasma EDA H-mode
Jul 23 1999 01:46:35:327PM	990723012	John Goetz	For 990723012: no changes Results: dud power supply faults @ -0.65s
Jul 23 1999 02:20:02:793PM	990723013	John Goetz	For 990723013: no changes Results: plasma o.k. current rise something injected @ 0.34s, disruption @ 0.377s
Jul 23 1999 02:46:22:607PM	990723014	John Goetz	For 990723014: slow down initial CLEARIN ramp Results: plasma o.k. current rise something injected @ 0.39s, disruption @ 0.423s
Jul 23 1999 03:06:07:030PM	990723015	John Goetz	For 990723015: speed-up initial CLEARIN ramp Results: plasma o.k. current rise something injected @ 0.19s, disruption @ 0.21s (the CLEARIN change shouldn't have affected the plasma this early)
Jul 23 1999 03:27:17:093PM	990723016	John Goetz	For 990723016: reload 990723011 Results: fizzle; strong one breakdown @ .006 two bounces
Jul 23 1999 03:47:32:577PM	990723017	John Goetz	For 990723017: PG4 = 22ms move RCUR out @ 0.25s Results: fizzle; strong one; fast current rise breakdown @ .006 one bounce null doesn't look too bad
Jul 23 1999 04:10:35:950PM	990723018	John Goetz	For 990723018: PG4 = 23ms ICEF4 = -1275A move RCUR out @ 0.25s Results: plasma b.d. @ .006 good current rise gets in trouble @ 0.17s; disruption @ .33s is it touching the inner nose too early??
Jul 23 1999 04:31:38:467PM	990723019	John Goetz	For 990723019: slow down ramp of ZXL between 0.1 and 0.5s to keep the x-point up higher Results: plasma b.d. @ .006 good current rise gets in trouble @ 0.31s; disruption @ .38s better on the early rubbing things look good when the divertor forms, but it still disrupts
Jul 23 1999 04:48:59:170PM	990723020	John Goetz	For 990723020: slow down ZCUR ramp move RXL out earlier and increase the gain on the controller Results: plasma b.d. @ .006 good current rise gets in trouble @ 0.05s; disruption @ .15s hard x-ray formation beginning @ .05; dump @ 0.12s rubbing begins at segment switch
Jul 23 1999 05:08:48:623PM	990723021	John Goetz	For 990723021: load segment 2 from 990420009 which was a similar shot to the ones being run today Results: plasma b.d. @ .006 good current rise gets in trouble @ 0.145s; disruption @ .155s

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:08:25:013AM	Plasma	Ok	no faults
2	09:30:49:890AM	Plasma	Ok	no faults
3	10:14:19:030AM	Plasma	Ok	no faults
4	10:36:52:390AM	Plasma	Ok	no faults
5	11:03:23:327AM	Plasma	Ok	no faults
6	11:30:55:983AM	Plasma	Ok	no faults
7	11:56:05:890AM	Plasma	Ok	no faults
8	12:16:47:860PM	Plasma	Ok	(null)
9	12:38:15:420PM	Plasma	Ok	(null)
10	12:59:31:483PM	Plasma	Ok	(null)
11	01:21:20:827PM	Plasma	Ok	(null)
12	01:42:41:060PM	Plasma	Bad	OH2L Fault
13	02:10:45:763PM	Plasma	Ok	No faults
14	02:32:24:920PM	Plasma	Bad	oh1 self pwrd crkt fired.
15	02:53:04:780PM	Plasma	Ok	(null)
16	03:17:03:857PM	Plasma	Ok	(null)
17	03:37:56:623PM	Plasma	Ok	(null)
18	03:58:38:687PM	Plasma	Ok	(null)
19	04:19:30:967PM	Plasma	Ok	(null)
20	04:40:48:577PM	Plasma	Ok	(null)
21	05:02:41:390PM	Plasma	Ok	(null)