| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | John Liptac |
| Physics operator(s): | Ron Parker,Steve Wolfe,Ron Parker |
| Engineering operator(s): | Ed Fitzgerald,Sam Pierson,Bill Parkin |
| Engineering Operator Run Comment |
| MP#418 LH Coupling Studies PO: Parker SL: Liptac/Parker EO: Fitzgerald,P |
| Session Leader Plans |
| Entered: Apr 19 2006 05:46:16:910PM |
| Author: John Liptac |
| Run Plan 1060420 LH Current Drive
Goal: 1. Drive LH Current Plasma Conditions: Begin with the same type of plasmas as produced on 1060413. Low density L-mode, lower single null, nl_04~0.5, B0=5.4 T, and Ip~ 700kA. No ICRF during LH pulses. Load shot 1060310024. LH setup: Begin with the launcher at 1585 counts ~1mm behind limiter. Set mechanical phase shifters to 90 degree CD phasing. Shot 1: two segments, 90 CD phasing. LH power at 0.695 s. 40kW/klystron. Setpoint generator settings: Shot Length=200 ms, Duty Cycle=30%, Pulse Period=100 ms. Shot 2: two segments, 90 CD phasing. LH power at 0.695 s. 50kW/klystron. Setpoint generator settings: Shot Length=200 ms, Duty Cycle=50%, Pulse Period=100 ms. Shot 3: two segments, 90 CD phasing. LH power at 0.695 s. 55kW/klystron. Setpoint generator settings: Shot Length=200 ms, Duty Cycle=60%, Pulse Period=100 ms. Shot 4: two segments, 90 CD phasing. LH power at 0.695 s. 60kW/klystron. Setpoint generator settings: Shot Length=200 ms, Duty Cycle=70%, Pulse Period=100 ms. Shot 5: two segments, 90 CD phasing. LH power at 0.695 s. 65kW/klystron. Setpoint generator settings: Shot Length=200 ms, Duty Cycle=80%, Pulse Period=100 ms. Shot 6: two segments, 90 CD phasing. LH power at 0.695 s. 70kW/klystron. Setpoint generator settings: Shot Length=200 ms, Duty Cycle=90%, Pulse Period=100 ms. Shot 7: two segments, 90 CD phasing. LH power at 0.695 s. 75kW/klystron. Setpoint generator settings: Shot Length=200 ms, Duty Cycle=100%, Pulse Period=100 ms Once this level has been reached begin to change plasma conditions Explore outer gap ~3 shots. Limited discharges ~3 shots. Lower n, Ip ~10 shots or more. Possible phase scan. Higher B if permitted, phase scan. |
| Physics Operators Plans |
| Entered: Apr 19 2006 04:35:37:100PM |
| Author: Ron Parker |
| Physop Plan and Engineering Setup for Thursday, April 20
MP#418 LH Coupling studies SL: Liptac/Parker PO: Parker ECDC overnight in D2 at 2.e-4 Torr Power systems as on 1060413001 A-coil configuration: normal [+Dtop -Dbot -Jtop +Jbot] and enabled. C-coil Start=0.3sec, Invert=2.0sec ICRF: J-port in run on status by 7:30 Gas Setup: ---------- fill B-top 6psi D2 Hybrid enabled (PG4) fill B-side lower 1 psi Argon Hybrid Disabled (PG1) fill B-side Upper as is, Hybrid Disabled (PG2) fill B-main 40psi D2 Hybrid Enabled (PG3) NINJA: 12psi D2 Enable ECE, VUV, Z-bolo shutter assuming no vacuum problems Run Plan We will be running low density discharges to continue LH coupling studies with a goal of increasing power and pulse length. The main objective for this run is to produce measurable current drive. The plasmas will be standard L-mode discharges initially with ne_l(04)~ 0.5e20 m-2, BT = 5.4 T and Ip ~ 700 kA. We will try to reduce the density and lower the current in order to have the best chance to see current drive. LH power target will be 75 kW for 200 ms. The coupler will be moved in to 1585, which should be flush with the LH limiter but 5 mm in back of the main limiters. We will spend some time optimizing coupling efficiency. Also in the plan will be a few limited shots and some at higher field, e.g., 8T if permitted. |
| Session Leader Summaries |
| Entered: Apr 20 2006 08:06:50:153PM |
| Author: John Liptac |
| A very successful run. The goal today was to produce current drive and extend the pulse length and power. Ran 400 ms into plasma and saw evidence of current drive! Max coupled power about 400 kW. LHCD was evedent by the decrease in the loop voltage and a slight increase in the plasma current. The power level was raised up to 85 kW on most klystrons. Pushing the launcher in another mm resulted in lowering the reflection coefficients by ~5%.
Periodic oscillations as well as real arcs were observed. The arcs seemed to be located near the jungle gym couplers and not in the rear waveguide assembly. The power was typically lowered on the offending klystron, and would operate well on susequent shots. Jungle gym protection will be needed for high performance operation, as well as the ability to go near maximum klystron power. Changing the phase from decreasing to increasing phase resulted in current drive. |
| Physics Operator Summaries |
| Entered: Apr 20 2006 05:08:26:500PM |
| Author: Ron Parker |
| A good day for the machine and for LH. First indications of current drive were seen after correcting the phase of the fixed phase shifters. Running low density produces lots of runaways, and this confuses the actual amount of current drive due to RF. It was possible to reduce the loop voltage by 2, from 0.9 V to 0.4 V, but not more. As expected the loop voltage reduction decreases with increasing density. Clearly, more power will be needed, but this requires a more elaborate protection system. The klystrons all ran reasonably well at ~ 80 kW each, although klystron 4 was limited to 35 kW to avoid breakdown problems.
The machine ran well with 31 shots fired and only 1 dud. |
| Session Leader Comments | |||
| Apr 20 2006 09:19:29:953AM | 1060420001 | John Liptac | Goal of today's run is to try and observe a little LH current drive. Power and pulse length will be brought up while the launcher is about flush with the limiter to give better coupling.
Yesterday all klystrons except 2, 4, and 6 were conditioned up to 80kw/klystron for 200 ms. The klystrons that were not test had spoilers on the dummy loads. Use two 100 ms segments and gradually increase the duty cylce until a 200 ms pulse is created. Using 90 degree CD phasing 40kW/klystron Two 30 ms pulses with a 70 ms spacing at 1.2 s when the density is low based on shot 1060413001. HXR set to digitize 1.5 s of data- giving longer store times and larger data sets. ICRF set to go at 1.45 s. Fault on segment 1, RINTs ok third harmonic seems to be the culprit. Second pulse through ok. Lots HXR and ECE signal from the low density nl04 ~3.2. Antenna looks ok on LH camera. |
| Apr 20 2006 09:43:23:767AM | 1060420003 | John Liptac | Using 90 degree CD phasing
50kW/klystron Two 50 ms pulses with a 50 ms spacing at 1.2 s. Keep loosing first segment. Go to three segments and plan on getting two. Lots of hards see we can bring them down about. |
| Apr 20 2006 09:53:29:877AM | 1060420004 | John Liptac | Using 90 degree CD phasing
55kW/klystron Three 60 ms pulses with a 40 ms spacing at 1.1 s. Got all three this time. Periodic oscillation returns on klystron 4. |
| Apr 20 2006 10:07:48:313AM | 1060420005 | John Liptac | Using 90 degree CD phasing
60kW/klystron Three 70 ms pulses with a 30 ms spacing at 1.1 s. Periodic oscillation on klystron 4 segment 1 only. |
| Apr 20 2006 10:22:39:093AM | 1060420006 | John Liptac | Using 90 degree CD phasing
65kW/klystron Three 80 ms pulses with a 20 ms spacing at 1.1 s. Klystron 4 set to 50kW. Got all three, tremendous HXR and ECE signal. Lots of pile up and creation of runaways. No oscillation on 4. |
| Apr 20 2006 10:33:16:173AM | 1060420007 | John Liptac | Using 90 degree CD phasing
70kW/klystron Three 90 ms pulses with a 10 ms spacing at 1.1 s. Klystron 4 set to 50kW. Pulses are starting to fill in. |
| Apr 20 2006 10:48:17:783AM | 1060420008 | John Liptac | Using 90 degree CD phasing
75kW/klystron Three 100 ms pulses with a 0 ms spacing at 1.1 s. Klystron 4 set to 50kW. Lost first 40 ms on first pulse, began on second restrike attempt and then ran well. |
| Apr 20 2006 11:17:18:430AM | 1060420009 | John Liptac | Using 90 degree CD phasing
75kW/klystron Four 100 ms pulses with a 0 ms spacing at 1.0 s. Klystron 4 set to 50kW. Bad oscillation, and likely arc on 4, reduce power. Faulted at end. No change on current or loop voltage. 3rd harmonic might have actually worked. |
| Apr 20 2006 11:12:54:563AM | 1060420010 | John Liptac | Using 90 degree CD phasing
75kW/klystron Four 100 ms pulses with a 0 ms spacing at 1.0 s. Klystron 4 set to 40kW. Oscillation gone on 4. Faulted at beginning. No change on current or loop voltage Cell access to go to 90 CCD. |
| Apr 20 2006 12:52:24:140PM | 1060420011 | John Liptac | Using 90 degree CCD phasing
40kW/klystron Four 20 ms pulses with a 80 ms spacing at 1.0 s. Klystron 4 will be kept at 40kW throughout Lost pulse number 4. How bout some current! Increase power and pulse length and try to drive more. |
| Apr 20 2006 12:20:57:077PM | 1060420012 | John Liptac | Using 90 degree CCD phasing
50kW/klystron Four 40 ms pulses with a 60 ms spacing at 1.0 s. More current! Increase power and pulse length and try to drive more, and match results from the start of the run. |
| Apr 20 2006 12:27:45:250PM | 1060420013 | John Liptac | Using 90 degree CCD phasing
55kW/klystron Four 50 ms pulses with a 50 ms spacing at 1.0 s. Runaways to start with. Fault on the start of segment 3. |
| Apr 20 2006 12:45:21:953PM | 1060420014 | John Liptac | Using 90 degree CCD phasing
60kW/klystron Four 60 ms pulses with a 40 ms spacing at 1.0 s. Faults on segments 1, 2, and 4. Try running pulses together to avoid some of these trips. |
| Apr 20 2006 01:17:24:250PM | 1060420015 | John Liptac | Using 90 degree CCD phasing
60kW/klystron Four 100 ms pulses with a 0 ms spacing at 1.0 s. Timing issue on klystron 4 causes fault. |
| Apr 20 2006 01:29:25:047PM | 1060420016 | John Liptac | Using 90 degree CCD phasing
65kW/klystron Four 100 ms pulses with a 0 ms spacing at 1.0 s. Two faults to start. Oscillation on klystron 5. Go down in power and change phase. |
| Apr 20 2006 01:36:49:827PM | 1060420017 | John Liptac | Using 120 degree CCD phasing
50kW/klystron Four 100 ms pulses with a 0 ms spacing at 1.0 s. Faults on first four tries. |
| Apr 20 2006 01:54:14:687PM | 1060420018 | John Liptac | Using 120 degree CCD phasing
60kW/klystron Four 100 ms pulses with a 0 ms spacing at 1.0 s. 60 kW klystron can compare directly with shot 15. Great result got all 4 segments. |
| Apr 20 2006 02:09:10:327PM | 1060420019 | John Liptac | Using 60 degree CCD phasing
50kW/klystron Four 100 ms pulses with a 0 ms spacing at 1.0 s. Ran well, one fault at start up. Go to 60 kW/klystron |
| Apr 20 2006 02:19:48:983PM | 1060420020 | John Liptac | Using 60 degree CCD phasing
60kW/klystron Four 100 ms pulses with a 0 ms spacing at 1.0 s. Faulted twice, Once on RINT3. |
| Apr 20 2006 02:35:33:373PM | 1060420021 | John Liptac | 6.5 T, Try to get better penetration.
Using 60 degree CCD phasing 60kW/klystron Four 100 ms pulses with a 0 ms spacing at 1.0 s. More of an effect. Go back to 90. |
| Apr 20 2006 02:44:25:187PM | 1060420022 | John Liptac | 6.5 T.
Using 90 degree CCD phasing 60kW/klystron Four 100 ms pulses with a 0 ms spacing at 1.0 s. No LH faulted out 6 times and gave up. |
| Apr 20 2006 02:59:12:640PM | 1060420023 | John Liptac | 6.5 T.
Using 90 degree CCD phasing 60kW/klystron Four 100 ms pulses with a 0 ms spacing at 1.0 s. No faults ran through all segments. |
| Apr 20 2006 03:12:37:873PM | 1060420024 | John Liptac | 6.5 T.
Using 90 degree CCD phasing 60-75 kW/klystron Ramp Four 100 ms pulses with a 0 ms spacing at 1.0 s. Klystron 4 set at 40 kW. 3 faults on startup and then went. |
| Apr 20 2006 03:25:37:843PM | 1060420025 | John Liptac | 6.5 T.
Using 90 degree CCD phasing 65-80 kW/klystron Ramp Four 100 ms pulses with a 0 ms spacing at 1.0 s. Klystron 4 set at 40 kW. Fault on first two segments |
| Apr 20 2006 03:44:10:687PM | 1060420026 | John Liptac | 6.5 T.
Using 90 degree CCD phasing 70-85 kW/klystron Ramp Four 100 ms pulses with a 0 ms spacing at 1.0 s. Klystron 4 set at 40 kW. Fault first segment. Periodic oscillation on klystron 1. |
| Apr 20 2006 03:59:26:280PM | 1060420027 | John Liptac | 6.5 T.
Using 90 degree CCD phasing 70-85 kW/klystron Ramp Four 100 ms pulses with a 0 ms spacing at 1.0 s. Klystron 4 set at 40 kW. Klystron 1 set to 60 kW.. No problem on 1 this time and got all segments. |
| Apr 20 2006 04:18:03:827PM | 1060420028 | John Liptac | 6.5 T.
Using 90 degree CCD phasing 70-85 kW/klystron Ramp Four 100 ms pulses with a 0 ms spacing at 1.0 s. Klystron 4 set at 40 kW. Klystron 1 set to 60 kW. Increase density slightly to lower HXR signal and reduce pile up. Got all segments. Density only slightly higher would like nl04 of about 0.5. |
| Apr 20 2006 04:36:16:983PM | 1060420029 | John Liptac | 6.5 T.
Using 90 degree CCD phasing 70-85 kW/klystron Ramp Four 100 ms pulses with a 0 ms spacing at 1.0 s. Klystron 4 set at 40 kW. Klystron 1 set to 60 kW. Increase density slightly to lower HXR signal and reduce pile up. Got all segments. |
| Apr 20 2006 04:42:42:060PM | 1060420030 | John Liptac | 6.5 T.
Using 90 degree CCD phasing 70-85 kW/klystron Ramp Four 100 ms pulses with a 0 ms spacing at 1.0 s. Klystron 4 set at 40 kW. Klystron 1 set to 60 kW. Increase density slightly to lower HXR signal and reduce pile up. Cart 3 into loads to try and check phasing. Not dramatically different from the previous shot. |
| Apr 20 2006 04:45:39:513PM | 1060420030 | John Liptac | 6.5 T.
Using 90 degree CCD phasing 70-85 kW/klystron Ramp Four 100 ms pulses with a 0 ms spacing at 1.0 s. Klystron 4 set at 40 kW. Klystron 1 set to 60 kW. Increase density slightly to lower HXR signal and reduce pile up. Cart 3 into loads to try and check phasing. Not dramatically different from the previous shot. Go back to low density and try and check again |
| Apr 20 2006 04:55:28:797PM | 1060420031 | John Liptac | 6.5 T.
Using 90 degree CCD phasing 70-85 kW/klystron Ramp Four 100 ms pulses with a 0 ms spacing at 1.0 s. Klystron 4 set at 40 kW. Klystron 1 set to 60 kW. Cart 3 into loads to try and check phasing. Tried to match density from shot 27. Three faults to start. |
| Physics Operator Comments | |||
| Apr 20 2006 09:17:22:470AM | 1060420001 | Ron Parker | Shot 1 ran as programmed. |
| Apr 20 2006 09:26:36:597AM | 1060420002 | Ron Parker | Shot 002 was a dud. Sparker current much lower than yesterday. |
| Apr 20 2006 10:38:50:173AM | 1060420003 | Ron Parker | Shot 3 ran without changes. Rf pulse at 50 ms, ~ 50 kW per klystron at FINT. |
| Apr 20 2006 10:39:11:017AM | 1060420004 | Ron Parker | Shot 4 ran OK |
| Apr 20 2006 10:38:25:407AM | 1060420005 | Ron Parker | Shot 5 was OK |
| Apr 20 2006 10:21:21:423AM | 1060420006 | Ron Parker | Shot 6 ran ran OK. No problems shince loading 1060310024 |
| Apr 20 2006 10:37:59:847AM | 1060420007 | Ron Parker | Shot 7 ran OK. Power up to 60-70 kW per klystron. |
| Apr 20 2006 10:40:54:143AM | 1060420008 | Ron Parker | Shot 8 ran OK, Continuous RF for 250 ms. |
| Apr 20 2006 11:08:17:360AM | 1060420009 | Steve Wolfe | Shot#10: Wolfe filling in for Parker as physop while he's at class. No PCS changes for this shot. Plasma. Next: Cell access to change mech. phase setting |
| Apr 20 2006 12:06:21:903PM | 1060420011 | Steve Wolfe | Shot#11: LH phase has been reversed. Pulse train set back to wimpy little 20msec blips. No PCS changes. plasma, lots of late hard xrays. Serious blips on Te8 Looks like current drive on loop voltage and Ip traces at 1.0, 1.1, 1.2 |
| Apr 20 2006 12:14:39:233PM | 1060420012 | Steve Wolfe | Shot#12: No PCS changes, increasing pulse width on LH pulses plasma. Four LH pulses. Look at that loop voltage change! |
| Apr 20 2006 12:28:12:657PM | 1060420013 | Steve Wolfe | Shot#13: No PCS changes Plasma had runaways at the beginning. 50msec pulses, fault on the third one. Nice response on Vl and Ip |
| Apr 20 2006 12:32:14:500PM | 1060420013 | Steve Wolfe | Shot#14: No PCS changes Ron's back. |
| Apr 20 2006 12:42:53:327PM | 1060420014 | Ron Parker | Shot 14 went off OK. |
| Apr 20 2006 01:39:38:983PM | 1060420015 | Ron Parker | Shot 15 ran well. |
| Apr 20 2006 01:39:51:517PM | 1060420016 | Ron Parker | Shot 17 ran OK. |
| Apr 20 2006 01:39:26:890PM | 1060420017 | Ron Parker | Shot 16 ran well. |
| Apr 20 2006 01:53:16:483PM | 1060420018 | Ron Parker | Shot 18 ran well. |
| Apr 20 2006 02:06:06:187PM | 1060420019 | Ron Parker | shot 19 was OK. |
| Apr 20 2006 02:23:26:437PM | 1060420020 | Ron Parker | Shot 20 ran. Next: raise field by 20%, 5.4 T to 6.5 T |
| Apr 20 2006 02:45:14:060PM | 1060420021 | Ron Parker | Shot 21 went off well. |
| Apr 20 2006 02:44:30:483PM | 1060420022 | Ron Parker | Shot 22 went off well, but no RF. |
| Apr 20 2006 03:49:15:123PM | 1060420023 | Ron Parker | Shot 23 was OK. |
| Apr 20 2006 03:50:08:013PM | 1060420024 | Ron Parker | Shot 24 was fine. |
| Apr 20 2006 03:50:29:373PM | 1060420025 | Ron Parker | Shot 25 was good. |
| Apr 20 2006 03:47:50:390PM | 1060420026 | Ron Parker | Shot 26 went off OK. |
| Apr 20 2006 04:00:53:110PM | 1060420027 | Ron Parker | Shot 27 was good. All klystrons around 80 kW, except V1 and V4. |
| Apr 20 2006 04:04:50:437PM | 1060420027 | Ron Parker | Shot 27 went off OK. Next: set density to ne_l(4) to 5e19 cm-2 |
| Apr 20 2006 04:19:09:077PM | 1060420028 | Ron Parker | Shot 28 was good. Next increase programmed density to 6 cm-2 on ne_l4.
|
| Apr 20 2006 04:29:32:220PM | 1060420029 | Ron Parker | Shot 29 ran as programmed, density higher, less effect of current drive. |
| Apr 20 2006 04:50:44:937PM | 1060420030 | Ron Parker | Shot 30 OK. Cart 3 off. similar change in voltage, but somewhat higher density. |
| Apr 20 2006 05:02:25:593PM | 1060420031 | Ron Parker | Shot 31, the final shot of today's run, was good. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:59:41:050AM | Plasma | Ok | |
| 2 | 09:16:00:440AM | Plasma | Ok | |
| 3 | 09:28:28:097AM | Plasma | Ok | |
| 4 | 09:43:42:940AM | Plasma | Ok | |
| 5 | 09:59:08:923AM | Plasma | Ok | |
| 6 | 10:11:35:377AM | Plasma | Ok | |
| 7 | 10:24:34:610AM | Plasma | Ok | |
| 8 | 10:37:03:673AM | Plasma | Ok | |
| 9 | 10:49:29:830AM | Plasma | Ok | |
| 10 | 11:05:45:110AM | Plasma | Ok | |
| 11 | 11:55:59:593AM | Plasma | Ok | |
| 12 | 12:10:35:000PM | Plasma | Ok | |
| 13 | 12:23:04:030PM | Plasma | Ok | |
| 14 | 12:35:37:450PM | Plasma | Ok | |
| 15 | 12:51:46:187PM | Plasma | Ok | |
| 16 | 01:20:40:610PM | Plasma | Ok | |
| 17 | 01:33:18:390PM | Plasma | Ok | |
| 18 | 01:45:55:420PM | Plasma | Ok | |
| 19 | 02:00:44:297PM | Plasma | Ok | |
| 20 | 02:14:06:453PM | Plasma | Ok | |
| 21 | 02:27:47:953PM | Plasma | Ok | |
| 22 | 02:40:39:047PM | Plasma | Ok | |
| 23 | 02:54:52:623PM | Plasma | Ok | |
| 24 | 03:07:41:407PM | Plasma | Ok | |
| 25 | 03:21:35:263PM | Plasma | Ok | |
| 26 | 03:38:15:390PM | Plasma | Ok | |
| 27 | 03:55:47:030PM | Plasma | Ok | |
| 28 | 04:09:40:780PM | Plasma | Ok | |
| 29 | 04:23:37:797PM | Plasma | Ok | |
| 30 | 04:36:41:810PM | Plasma | Ok | |
| 31 | 04:50:07:513PM | Plasma | Ok | |