| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Amanda Hubbard |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Bill Cochran,Bill Parkin,Bill Byford |
| Engineering Operator Run Comment |
| MP 314 Btor ramps to measure dTe/dr. Hubbard/Granetz. |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:30:443PM |
| Author: To Be Determined |
| Session Leader's summary for 1020910 Session Leader: Amanda Hubbard Physics Operator: Bob Granetz Eng. Operator: Bill Byford MP 314 (David Mikkelsen, in absentia) Evaluate BT sweep method of LTe Aim: 1) Establish reliability and uncertainty of measuring Lte using Bt sweeps, in ohmic plasmas. 2) Measure q dependence of LTe, using Ip scan. A rough run plan: 1) Set up a 1 MA, 5.4 T discharge, with 'normal' diverted shape and nebar ~2.e20 (nel ~1.2?). A suitable starting shot may be 1020828026. Repeat discharges until steady conditions are reached (which means good ne control, no impurity injections or accumulation, and modest (30%?) radiation.) No disruptions, natch! Given we just had a vaccuum break, this may take several shots. 2). Take 1-2 discharges with a big, slow TF ramp 5.0-6.0 T. The purpose is to quantify the ECE position discrapancy (useful for analysing this and other expts). 3) Start Dave's run sequence from MP 314, with the 1 MA set of shots. (at least three, may want to vary sweep rate). 4) Repeat at 0.5 MA. 5) Repeat at 1.3 (not 1.5!) MA. If we get this far, keep following Dave's shot sequence (ie density scan). Results: As expected, given this was the first run after a machine vent, several shots were needed to re-establish full length discharges. Shots 1-3 were short and disruptive, 4 was a full length 800 kA discharge, and 7 and 8 were again radiative and disruptive. Raising Ip to 1 MA on shot 9 helped to get over the radiation problem, and we entered a pattern of alternating fizzles and full length plasmas. Shot 11 had the required higher density, nebar=2x 10^20 m-3. All of the discharges had fairly high radiation (typically 700 kW on 2pi-foil bolo) and had modest but clear and steady decreases in Te, and stored energy, throughout the flat top. These conditions are thus not truly suitable to test the limitations of the Bt sweep method for Lte determination. However, we did go ahead and try several shots with Bt variation. Shots 14 and 16 had large, slow variations in Btor, 4.6 to 5.8 T on shot 16. During this sweep, various GPC channels in the gradient region overlaid remarkably well, demonstrating that Te(R) is fairly insensitive to B (one of the main assumptions of the method). The sweeps also clearly showed that the apparent position of the edge, based on GPC position calculations, is well inside Rsep. A shift of 22 mm gave good alignment with edge TS (actually on shot 27, which had the best ETS signals) and reasonable Tsep~70 eV). The determination of the error in the magnetic axis was less clear than I had hoped, since the variation of sawtooth amplitude across the core region is rather weak in ohmic plasmas. Various estimates, based on inversion radius and internal MHD, range from 1.9 to 2.3 cm. (as an aside, a clearer determination was obtained with RF heating on 1020911, and gave a shift of 1.3 cm) Shot 22 returned to steady Te to check the constancy of the discharge (still not great). Shots 22, 25, and 27 were the only ones to test the small Bt sweeps called for in the main part of the MP. Nominal Sweep was 5.4-5.6 T. On shot 22, triangular ramps with 80 ms period were programmed. The response was too slow and actual sweep was only 5.4-5.4 T (less in backsweep). For shot 25, we programmed 'steps' in Bt which gave close to the intended sweep. However, engineers reported that this caused increases in alternator vibration. Such TF waveforms have been used many times in past campaigns for pedestal measurements. Either we are now looking more closely at the alternator signals, or there has been a change in the alternator that makes it more sensitive; this should obviously be investigated! For shot 27, we slowed down the ramps considerably, taking 250 ms to scan 0.2 T. This gave good gradient measurements. Comparing the three shots should allow Dave to determine how much sweep is really needed. A 250 ms sweep time may limit the utility of the method for RF-heated or H-mode discharges, which rarely stay completely steady for this duration. Since we did not start the parameter scan part of the MP, it should be revisited once machine conditions improve and we can get truly steady Te in ohmic plasmas. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:16:083PM |
| Author: To Be Determined |
| Physics operator summary for run 1020910 (Tuesday): MP 314: Btor ramps to measure dTe/dr Session leader: A. Hubbard Physics operator: R. Granetz Engineer in charge: W. Cochran, Bill Byford, Bill Parkin Summary: Sort of a so-so day. It was partly a recovery day from this weekend's vent, yet we managed to get reasonable data for the first part of MP 314. There are hints on the RGA that we may still have a vacuum leak. After some short disruptive shots early on, we settled down to a 50-50 mix of 1 MA plasmas and fizzles. A number of shots had varying degrees of Btor ramps, and the resulting GPC data looks very good (see Amanda's run summary), but it's only a beginning. We had to slow the Btor waggles down (to less than what we used to do for edge Te scans) in order to keep things quiet in the alternator house. It would be really nice if we could get the ratiomatic gauge working again...otherwise the physop is working in the dark as far as diagnosing fizzle problems. Scorecard: 14 plasmas 13 fizzles 0 duds 0 test 1 aborted and/or screwed up by computer problems ---------- 28 total ------------------------------------------------------------------------------- Engineering setup for Tuesday 10 Sept 2002 MP 314: Btor ramps to measure dTe/dr Session leader: A. Hubbard Physics operator: R. Granetz ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00. Bake at 60 C overnight as well. Set up for possible ECDC in D2 between shots. Run begins at 09:00 and ends at 17:00. Power systems the same as shot 1020828026 (1.0 MA, 5.3 T, lower single null) Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) leave J-Bottom as is Hybrid DISABLED (PG5) Enable the following gate valves, assuming no vacuum problems: ECE, VUV Do NOT enable the DNB gate valve yet. ------------------------------------------------------------------------------- RF Setup: All 4 transmitters in Remote before access-control is enabled. ------------------------------------------------------------------------------- Run Plan: Measure local dTe/dr by adding small ramps to Btor. Start with shot 1020828026 (1.0 MA, 5.3 T, 2.0e20 m-3, normal shape), but bump up Btor to 5.4 T (constant) Then add the prescribed Btor waggles. If there's time, re-run at 0.5 MA, the 1.3 MA, then at ne=1.0e20 m-3. Late-breaking addition to plan: after the first shot (with constant Btor), Amanda requests that we do 1-2 shots with a large, slow Btor ramp (5 -> 6 T) to help resolve the issues surrounding the Btor calibration and ECE channel locations. ------------------------------------------------------------------------------- ECDC was done overnight, as well as a bake at 60 C. Hybrid coldstart done; no errors found Loaded PCS from shot 1020828026 (all segments). Tweak Btor to 5.4 T (rather than 5.3 T), tweak nl_04 to 1.2e20 m-2 (2e20 m-3), reduce pre-fill puff to 23 ms. ------------------------------------------------------------------------------- Due to high levels of nitrogen, argon, etcetera, and the dire predictions of the peanut gallery, I've reduced the plasma current to 0.8 MA for the beginning of the run. Shot 01 -- Plasma, but only lasted until 0.17 s. Startup looks okay, but the g-side ratiomatic isn't working. No mflux traces either. Next shot: reduce pre-fill by 2 ms. Shot 02 -- Plasma...another short one. Next shot: reduce nl_04 to 0.8e20 m-2. Also tweak Btor a tiny amount, although we've pretty much de facto abandoned the run until we recover from the recent vent. Shot 03 -- Plasma. Disrupted at 0.24 s. Next shot: reduce nl_04 to 0.6e20 m-2 and slow it down, reduce pre-programmed gas puff in segment 2 as well. Shot 04 -- Plasma. Good shot...complete rampdown. nl_04=0.65e20 m-2; no hard x-rays. Btor=5.39 T. H/D=0.35. Next shot: increase nl_04 to 0.9e20 m-2 Shot 05 -- Fizzle. Next shot: no changes. Shot 06 -- Aborted. Shot cycle problem. Next shot: try again. Disable argon puff (B-side-lower). Shot 07 -- Plasma. Disrupted at t=0.54 s, after getting very resistive. However, the magnetics CPCI's all failed...each channel only has one data point. Josh is looking at it. Josh has requested that I power cycle the CPCI's, which I did. Next shot: no changes. Shot 08 -- Plasma. Disrupted at t=0.56 s, after getting resistive. The magnetics CPCI are working again. Next shot: back off on the density a little, and raise Ip to 1.0 MA. Shot 09 -- Plasma. 1.0 MA. Nearly full length. nl_04=0.85e20 m-2 (nebar=1.4e20 m-3), 5.4 T. Next shot: try again to raise nl_04 to 1.0e20 m-2, now at 1 MA. Shot 10 -- Fizzle. Since I don't have any pressure measurement, I can't tell if the pre-fill pressure is different on these fizzles. Next shot: no changes Shot 11 -- Plasma. 1.0 MA, nice shot. nl_04=1.0-1.05e20 m-2. Next shot: raise nl_04 to 1.1e20 m-2. Shot 12 -- Fizzle. We seem to be in an alternating pattern...not unusual for a recovery run. Next shot: no PCS changes Shot 13 -- Fizzle. Next shot: reduce pre-fill by 1 ms. Add a TF ramp to do the Btor = 5 -> 6 T scan. Raise current limit on TF to 175 kA. Inform alternator crew of impending TF waggle. Also, enable the argon valve. Shot 14 -- Plasma. Good shot. 1 MA. Btor scanned from 5.1 -> 5.85 T. nl_04=1.15e20 m-2, which is just about what we wanted. Not much change in Te0 though. Next shot: try to pull the density down faster after t=1.5 s. Increase the range of the Btor ramp from 4.5 -> 6.1 T, adjusting times appropriately to keep ramp rates within allowed limit of 75 kA/s. I had to leave for a dentist appt. Steve Wolfe is taking over now. Shot 15 -- Fizzle. Shot 16 -- Plasma. Large Btor ramp. Some change seen on Te0. Shot 17 -- Fizzle. Shot 18 -- Fizzle. Shot 19 -- Fizzle. Next shot: Steve re-loaded the startup segment from shot 11. Shot 20 -- Plasma. Good shot. 1 MA, 5.4 T (constant), nebar=2.0e20 m-3. Lots of hard x-rays. Next shot: put in Btor waggles, as prescribed in updated MP, lengthen Ip flattop to t=1.69 s, increase early gas puffing. Shot 21 -- Fizzle. Next shot: reduce pre-fill by 2 ms. Shot 22 -- Plasma. Good shot. 1 MA, with small Btor wiggles of about half the amplitude that we wanted. dI_tf/dt is also about half the limit as well. Hard x-rays are gone. H/D=0.3-0.4 . Next shot: put in square steps for the Btor waggles, increase argon puff to 50 ms. Shot 23 -- Fizzle. Next shot: no changes Shot 24 -- Fizzle. Two in a row. Current is rising a little faster than on shot 22. Next shot: increase pre-fill puff by 2 ms. Shot 25 -- Plasma. Good shot. 1 MA with Btor wiggles. Apparently the square programming gave too much noise in the alternator house. Next shot: reprogram the TF waggles as slower ramps. Move the TF invert time to 1.7 s. Add 1 ms to pre-fill puff. Shot 26 -- Fizzle. Ip rise is definitely slower...maybe too slow. Next shot: subtract 1 ms from pre-fill puff Shot 27 -- Plasma. Good shot. 1 MA with Btor waggles. Final Btor flattop at 5.6 T was way too short. Next shot: more adjustment of the Btor waggles to get the ramps to turn out more like we want. No changes to the startup. Shot 28 -- Fizzle. Darn! End of run. |
| Session Leader Comments | |||
| Sep 10 2002 09:30:32:813AM | Amanda Hubbard | MP 314 (David Mikkelsen, in absentia) Evaluate BT sweep method of LTe Aim: 1) Establish reliability and uncertainty of measuring Lte using Bt sweeps, in ohmic plasmas. 2) Measure q dependence of LTe, using Ip scan. A rough run plan: 1) Set up a 1 MA, 5.4 T discharge, with 'normal' diverted shape and nebar~2.e20 (nel ~1.2?). A suitable starting shot may be 1020828026. Repeat discharges until steady conditions are reached (which means good ne control, no impurity injections or accumulation, and modest (30%?) radiation.) No disruptions, natch! Given we just had a vaccuum break, this may take several shots. 2). Take 1-2 discharges with a big, slow TF ramp 5.0-6.0 T. The purpose is to quantify the ECE position discrapancy (useful for analysing this and other expts). 3) Start Dave's run sequence from MP 314, with the 1 MA set of shots. (at least three, may want to vary sweep rate). 4) Repeat at 0.5 MA. 5) Repeat at 1.3 (not 1.5!) MA. If we get this far, keep following Dave's shot sequence (ie density scan). | |
| Sep 10 2002 12:46:20:990PM | 1020910011 | Amanda Hubbard | Nice shot, getting close to what we need for the MP. Te(0) is still drooping slightly during the discharge (not as much as W MHD). Outer Te's dropping more. nebar=1.9e20 m-3. |
| Sep 10 2002 01:53:42:700PM | 1020910014 | Amanda Hubbard | For this shot, added a large Bt sweep, nominal 5 to 6 T, but actually 5.2-5.8. The change in sawtooth amplitude is not as clear as hoped, when channels are close to center. For next shot, start earlier and increase range (4.5-6 T), to pin down inversion radii. |
| Sep 10 2002 03:10:20:727PM | 1020910020 | Amanda Hubbard | Back to constant 5.4 T. Fairly good, steady plasma. However, W(MHD) is dropping throughout the flat top (43-32 kJ). Te's are also dropping. Nebar 1.9 to 2.1x 10^20 m-3. Conditions are thus not ideal for Dave's LTe measurement, but we are going to go ahead and try the Bt sweeps. |
| Sep 10 2002 03:37:02:330PM | 1020910020 | Amanda Hubbard | First attemp at the periodic Bt sweeps. They were smaller and slower than programmed. Good shot, 45 to 36 kJ. Prad ~ 0.7 MW. nebar 1.9-2.0 |
| Sep 10 2002 04:47:39:187PM | 1020910025 | Amanda Hubbard | Made the sweeps bigger (by programming in steps). This got us almost the ramp we wanted. However, engineers are unhappy, so for the next attempt we will slow down to 250 ms per ramp, which means starting earlier. |
| Physics Operator Comments | |||
| Sep 9 2002 02:20:35:850PM | Robert Granetz | Remember to re-install the magnetics integrator circuit boards and turn the circuit power supply back on prior to beginning today's run! | |
| Sep 9 2002 06:41:28:593PM | Robert Granetz | Engineering setup for Tuesday 10 Sept 2002 MP 314: Btor ramps to measure dTe/dr Session leader: A. Hubbard Physics operator: R. Granetz ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00. Bake at 60 C overnight as well. Set up for possible ECDC in D2 between shots. Run begins at 09:00 and ends at 17:00. Power systems the same as shot 1020828026 (1.0 MA, 5.3 T, lower single null) Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) leave J-Bottom as is Hybrid DISABLED (PG5) Enable the following gate valves, assuming no vacuum problems: ECE, VUV Do NOT enable the DNB gate valve yet. ------------------------------------------------------------------------------- RF Setup: All 4 transmitters in Remote before access-control is enabled. ------------------------------------------------------------------------------- Run Plan: Measure local dTe/dr by adding small ramps to Btor. Start with shot 1020828026 (1.0 MA, 5.3 T, 2.0e20 m-3, normal shape), but bump up Btor to 5.4 T (constant) Then add the prescribed Btor waggles. If there's time, re-run at 0.5 MA, the 1.3 MA, then at ne=1.0e20 m-3. | |
| Sep 10 2002 08:40:17:630AM | Robert Granetz | ECDC was done overnight, as well as a bake at 60 C. Hybrid coldstart done; no errors found Loaded PCS from shot 1020828026 (all segments). Tweak Btor to 5.4 T (rather than 5.3 T), tweak nl_04 to 1.2e20 m-2 (2e20 m-3), reduce pre-fill puff to 23 ms. | |
| Sep 10 2002 08:54:01:960AM | Robert Granetz | Late-breaking addition to plan: after the first shot (with constant Btor), Amanda requests that we do 1-2 shots with a large, slow Btor ramp (5 -> 6 T) to help resolve the issues surrounding the Btor calibration and ECE channel locations. | |
| Sep 10 2002 09:44:04:930AM | Robert Granetz | Due to high levels of nitrogen, argon, etcetera, and the dire predictions of the peanut gallery, I've reduced the plasma current to 0.8 MA for the beginning of the run. | |
| Sep 10 2002 10:06:17:963AM | 1020910001 | Robert Granetz | Shot 01 -- Plasma, but only lasted until 0.17 s. Startup looks okay, but the g-side ratiomatic isn't working. No mflux traces either. Next shot: reduce pre-fill by 2 ms. |
| Sep 10 2002 10:26:57:840AM | 1020910002 | Robert Granetz | Shot 02 -- Plasma...another short one. Next shot: reduce nl_04 to 0.8e20 m-2. Also tweak Btor a tiny amount, although we've pretty much de facto abandoned the run until we recover from the recent vent. |
| Sep 10 2002 10:40:05:203AM | 1020910003 | Robert Granetz | Shot 03 -- Plasma. Disrupted at 0.24 s. Next shot: reduce nl_04 to 0.6e20 m-2 and slow it down, reduce pre-programmed gas puff in segment 2 as well. |
| Sep 10 2002 10:56:18:837AM | 1020910004 | Robert Granetz | Shot 04 -- Plasma. Good shot...complete rampdown. nl_04=0.65e20 m-2; no hard x-rays. Btor=5.39 T. H/D=0.35. Next shot: increase nl_04 to 0.9e20 m-2 |
| Sep 10 2002 11:01:53:813AM | 1020910005 | Robert Granetz | Shot 05 -- Fizzle. Next shot: no changes. |
| Sep 10 2002 11:29:21:543AM | 1020910006 | Robert Granetz | Shot 06 -- Aborted. Shot cycle problem. Next shot: try again. Disable argon puff (B-side-lower). |
| Sep 10 2002 11:45:44:053AM | 1020910007 | Robert Granetz | Shot 07 -- Plasma. Disrupted at t=0.54 s, after getting very resistive. However, the magnetics CPCI's all failed...each channel only has one data point. Josh is looking at it. Josh has requested that I power cycle the CPCI's, which I did. Next shot: no changes. |
| Sep 10 2002 12:02:27:627PM | 1020910008 | Robert Granetz | Shot 08 -- Plasma. Disrupted at t=0.56 s, after getting resistive. The magnetics CPCI are working again. Next shot: back off on the density a little, and raise Ip to 1.0 MA. |
| Sep 10 2002 12:20:59:933PM | 1020910009 | Robert Granetz | Shot 09 -- Plasma. 1.0 MA. Nearly full length. nl_04=0.85e20 m-2 (nebar=1.4e20 m-3), 5.4 T. Next shot: try again to raise nl_04 to 1.0e20 m-2, now at 1 MA. |
| Sep 10 2002 12:46:18:410PM | 1020910010 | Robert Granetz | Shot 10 -- Fizzle. Since I don't have any pressure measurement, I can't tell if the pre-fill pressure is different on these fizzles. Next shot: no changes |
| Sep 10 2002 12:45:58:847PM | 1020910011 | Robert Granetz | Shot 11 -- Plasma. 1.0 MA, nice shot. nl_04=1.0-1.05e20 m-2. Next shot: raise nl_04 to 1.1e20 m-2. |
| Sep 10 2002 12:50:25:493PM | 1020910012 | Robert Granetz | Shot 12 -- Fizzle. We seem to be in an alternating pattern...not unusual for a recovery run. Next shot: no PCS changes |
| Sep 10 2002 01:13:09:857PM | 1020910013 | Robert Granetz | Shot 13 -- Fizzle. Next shot: reduce pre-fill by 1 ms. Add a TF ramp to do the Btor = 5 -> 6 T scan. Raise current limit on TF to 175 kA. Inform alternator crew of impending TF waggle. Also, enable the argon valve. |
| Sep 10 2002 01:38:00:333PM | 1020910014 | Robert Granetz | Shot 14 -- Plasma. Good shot. 1 MA. Btor scanned from 5.1 -> 5.85 T. nl_04=1.15e20 m-2, which is just about what we wanted. Not much change in Te0 though. Next shot: try to pull the density down faster after t=1.5 s. Increase the range of the Btor ramp from 4.5 -> 6.1 T, adjusting times appropriately to keep ramp rates within allowed limit of 75 kA/s. |
| Sep 10 2002 01:46:32:753PM | 1020910015 | Steve Wolfe | shot#15: After this shot, wolfe taking over as physop for a couple of hours. fizzle. Thanks Bob! next shot: ic_ef4 from -1320 to -1310 |
| Sep 10 2002 02:05:48:720PM | 1020910016 | Steve Wolfe | shot#16: ic_ef4 from -1320 to -1310 plasma, some hards early. disrupts at 1.72sec Irby and Rosati have indicated that the signals to watch on the alternator bearings scope are the spv2 and spv3 A and B traces. They did show something on 1020830011 On shot 14, there was a small effect at the start of the first sweep, not much after. On this shot, I don't see much going on on these. next shot: back to constant 5.4 T, reload seg2 from shot11 |
| Sep 10 2002 02:13:06:073PM | 1020910017 | Steve Wolfe | shot#17: back to constant 5.4 T, reload seg2 from shot11; no startup change, init at 3.6e-6Torr -- there still seems to be a leak. fizzle. next shot: ic_ef4 from -1310 to -1300; I want to get Bz0 back to positive, then lower the puff |
| Sep 10 2002 02:27:57:393PM | 1020910018 | Steve Wolfe | shot#18: back to constant 5.4 T, reload seg2 from shot11; ic_ef4 from -1310 to -1300; I want to get Bz0 back to positive, then lower the puff another fizzle. current rise is fast, gets to 40kA by 12msec, then hits outside. I may need to play with Ian's early rcur point. change rcur[0.001] from .68 to .66 |
| Sep 10 2002 02:37:01:110PM | 1020910019 | Steve Wolfe | shot#19: back to constant 5.4 T, reload seg2 from shot11; change rcur[0.001] from .68 to .66 another fizzle. OK, go back to granetz startup, he only had two in a row. |
| Sep 10 2002 03:05:36:107PM | 1020910020 | Steve Wolfe | shot#20: plasma, Amanda seems happy with it. Bob gets to draw the wiggles |
| Sep 10 2002 03:05:53:843PM | 1020910020 | Steve Wolfe | shot#20: back to constant 5.4 T, reload seg2 from shot11; One more try, increase pre-puff from 20 to 24 msec. If this doesn't work I'll go back to shot#14 seg 1. Granetz will take over for shot 21. |
| Sep 10 2002 03:09:30:083PM | 1020910020 | Robert Granetz | Shot 20 -- Plasma. Good shot. 1 MA, 5.4 T (constant), nebar=2.0e20 m-3. Lots of hard x-rays. Next shot: put in Btor waggles, as prescribed in updated MP, lengthen Ip flattop to t=1.69 s, increase early gas puffing. |
| Sep 10 2002 03:19:15:287PM | 1020910021 | Robert Granetz | Shot 21 -- Fizzle. Next shot: reduce pre-fill by 2 ms. |
| Sep 10 2002 03:36:57:767PM | 1020910022 | Robert Granetz | Shot 22 -- Plasma. Good shot. 1 MA, with small Btor wiggles of about half the amplitude that we wanted. dI_tf/dt is also about half the limit as well. Hard x-rays are gone. H/D=0.3-0.4 . Next shot: put in square steps for the Btor waggles, increase argon puff to 50 ms. |
| Sep 10 2002 03:42:42:993PM | 1020910023 | Robert Granetz | Shot 23 -- Fizzle. Next shot: no changes |
| Sep 10 2002 03:56:04:280PM | 1020910024 | Robert Granetz | Shot 24 -- Fizzle. Two in a row. Current is rising a little faster than on shot 22. Next shot: increase pre-fill puff by 2 ms. |
| Sep 10 2002 04:31:38:520PM | 1020910025 | Robert Granetz | Shot 25 -- Plasma. Good shot. 1 MA with Btor wiggles. Apparently the square programming gave too much noise in the alternator house. Next shot: reprogram the TF waggles as slower ramps. Move the TF invert time to 1.7 s. |
| Sep 10 2002 04:34:58:353PM | 1020910026 | Robert Granetz | Shot 26 -- Fizzle. Ip rise is definitely slower...maybe too slow. Next shot: subtract 1 ms from pre-fill puff |
| Sep 10 2002 04:55:29:933PM | 1020910027 | Robert Granetz | Shot 27 -- Plasma. Good shot. 1 MA with Btor waggles. Final Btor flattop at 5.6 T was way too short. Next shot: more adjustment of the Btor waggles to get the ramps to turn out more like we want. No changes to the startup. |
| Sep 10 2002 05:13:18:227PM | 1020910028 | Robert Granetz | Shot 28 -- Fizzle. Darn! End of run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:48:01:950AM | Plasma | Ok | |
| 2 | 10:12:33:457AM | Plasma | Ok | |
| 3 | 10:28:24:637AM | Plasma | Ok | |
| 4 | 10:42:07:220AM | Plasma | Ok | |
| 5 | 10:57:59:323AM | Plasma | Ok | |
| 6 | 11:17:06:727AM | Plasma | Bad | igor fault |
| 7 | 11:29:51:857AM | Plasma | Ok | |
| 8 | 11:56:05:180AM | Plasma | Ok | |
| 9 | 12:08:52:773PM | Plasma | Ok | |
| 10 | 12:22:18:200PM | Plasma | Ok | |
| 11 | 12:35:12:877PM | Plasma | Ok | |
| 12 | 12:48:09:087PM | Plasma | Ok | |
| 13 | 01:01:45:527PM | Plasma | Ok | |
| 14 | 01:18:22:240PM | Plasma | Ok | |
| 15 | 01:40:16:477PM | Plasma | Ok | |
| 16 | 01:54:52:687PM | Plasma | Ok | |
| 17 | 02:09:13:710PM | Plasma | Ok | |
| 18 | 02:22:11:777PM | Plasma | Ok | |
| 19 | 02:35:22:217PM | Plasma | Ok | |
| 20 | 02:48:38:957PM | Plasma | Ok | |
| 21 | 03:10:45:350PM | Plasma | Ok | |
| 22 | 03:23:51:807PM | Plasma | Ok | |
| 23 | 03:39:21:003PM | Plasma | Ok | |
| 24 | 03:52:31:993PM | Plasma | Ok | |
| 25 | 04:05:32:937PM | Plasma | Ok | |
| 26 | 04:30:29:643PM | Plasma | Ok | |
| 27 | 04:43:28:447PM | Plasma | Ok | |
| 28 | 04:59:26:643PM | Plasma | Ok | |