Miniproposals

Miniproposal: 273 Date Filed: 6/19/2000 Title: Effects of Glow Discharge Cleaning on Boronization and Wall Conditions First Author: Jim Irby Session Leader: Jim Irby (shots 1-17)

Engineering Operator Run Comment

MP 273 Effects of Glow Discharge Cleaning on Boronization and Wall Condi

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:24:540PM

Author: To Be Determined

Session Leader Run Summary for 1000626 MP273 Effects of Glow Discharge Cleaning on Boronization and Wall Condition Particle Control Task Force Session Leader: Irby PO: Irby EO: Cochran, Dekow, Fitzgerald This experiment investigated another, possibly better, technique for preparing the walls for plasma discharges following boronization. It was a first step test of whether or not glow discharge cleaning in helium is useful for particle control. Other machines such as Asdex and DIIID use glow discharge cleaning techniques to both deposit boron and prepare the wall for plasma discharges. Between shot glow discharges, typically in helium, are used to clean the walls. The higher energy ions produced during glow are thought to be required for producing a "good" boron layer. We should be able to test whether or not such techniques are better than the ECDC process we have been using. Though we had several technical glitches during this run, the results are generally very useful in beginning to understand the effects of wall conditions on the plasmas we produce. Prior to the run on Monday, we did the following: Saturday: boronized the machine (1600 Ang deposition) ecdc cleaned in helium for a couple of hours started glow discharge cleaning in helium Saturday to Monday morning: glow discharge cleaned in helium at electrode voltages as high as 550 volts, and total currents up to 3.5 amps. Monday: stopped the glow at 7:00. No ECDC prior to run. For the first plasma shot on Monday we reloaded shot 1000616001 (defined as our fiducial shot), a 1 MA shot with target densities of 1e20 m^2, nl04. This shot required about 43 T-l of gas to run. The plan was to re-run this shot and see how much more gas it took after the extensive glow discharge campaign. Unfortunately, the first shot only lasted 350 ms. So we loaded the wall somewhat with a shot that could not be easily compared to the earlier fiducial. The following shot (3) ran full length and clearly required much more gas than the fiducial (62 T-l). The next two shots only required 36 and 33 T-l of gas. These values would probably have been closer to the fiducial shot had the PO asked the RF to be turned on at 800 rather than 600 ms. The conclusion is that it takes only 1 or 2 discharges to reload the walls, even after a very extended period of wall conditioning; probably just 1. We also did two periods of between shot glow discharge in helium. Both of these periods had 30 minutes of glow at up to 2.5 amps and 450 volts. However, we were unable to get to low enough pressures to produce the uniform, chamber filling, glow we had over the weekend. Following the glow, we again ran the fiducial discharge, and in both cases 45 T-l of gas was required. So, 30 minutes of glow is worth about 10 T-l of gas. The second shot following the glow was right back to the 33 to 35 T-l value; recovery again with 1 shot. Had we more time, we would have tried another period of glow lasting 60 minutes to see what the wall inventory depletion rate was. Finally, it was hoped that glow discharge cleaning in helium over the weekend would improve the effects of the boronization and possibly help the recovery process. I do think that the machine recovered very quickly. The machine was no harder to run on Monday than it had been the previous week. The carbon levels were very low, and the H/D was in the 3 to 5% range, even after the last two run of the previous week which ran very high hydrogen fraction discharges. However, the radiated power was rather high, even somewhat worse than the fiducial shot which was run well after the boronization of 5/30. The radiated power did seem to be coming down during the run, and was much better the following day after overnight ECDC in D2. The 1000627 run also produced our lowest ever H/D ratios (1 to 3%). How much the wall conditioning actually helped, if at all, will have to be determined over the next few days as we run the machine. Another run sometime in the distant future (September) would be useful in which between shot glow was run with variations in the length of glow time. We could then get a good measurement of the depletion rate. It would also be useful to do target density scans to see if we can reach a condition in which the density during the h-mode actually decreases.

Entered: Jul 7 2004 03:49:24:553PM

Author: To Be Determined

Session Leader Run Summary for 1000626 MP273 Effects of Glow Discharge Cleaning on Boronization and Wall Condition Particle Control Task Force Session Leader: Irby PO: Irby EO: Cochran, Dekow, Fitzgerald This experiment investigated another, possibly better, technique for preparing the walls for plasma discharges following boronization. It was a first step test of whether or not glow discharge cleaning in helium is useful for particle control. Other machines such as Asdex and DIIID use glow discharge cleaning techniques to both deposit boron and prepare the wall for plasma discharges. Between shot glow discharges, typically in helium, are used to clean the walls. The higher energy ions produced during glow are thought to be required for producing a "good" boron layer. We should be able to test whether or not such techniques are better than the ECDC process we have been using. Though we had several technical glitches during this run, the results are generally very useful in beginning to understand the effects of wall conditions on the plasmas we produce. Prior to the run on Monday, we did the following: Saturday: boronized the machine (1600 Ang deposition) ecdc cleaned in helium for a couple of hours started glow discharge cleaning in helium Saturday to Monday morning: glow discharge cleaned in helium at electrode voltages as high as 550 volts, and total currents up to 3.5 amps. Monday: stopped the glow at 7:00. No ECDC prior to run. For the first plasma shot on Monday we reloaded shot 1000616001 (defined as our fiducial shot), a 1 MA shot with target densities of 1e20 m^2, nl04. This shot required about 43 T-l of gas to run. The plan was to re-run this shot and see how much more gas it took after the extensive glow discharge campaign. Unfortunately, the first shot only lasted 350 ms. So we loaded the wall somewhat with a shot that could not be easily compared to the earlier fiducial. The following shot (3) ran full length and clearly required much more gas than the fiducial (62 T-l). The next two shots only required 36 and 33 T-l of gas. These values would probably have been closer to the fiducial shot had the PO asked the RF to be turned on at 800 rather than 600 ms. The conclusion is that it takes only 1 or 2 discharges to reload the walls, even after a very extended period of wall conditioning; probably just 1. We also did two periods of between shot glow discharge in helium. Both of these periods had 30 minutes of glow at up to 2.5 amps and 450 volts. However, we were unable to get to low enough pressures to produce the uniform, chamber filling, glow we had over the weekend. Following the glow, we again ran the fiducial discharge, and in both cases 45 T-l of gas was required. So, 30 minutes of glow is worth about 10 T-l of gas. The second shot following the glow was right back to the 33 to 35 T-l value; recovery again with 1 shot. Had we more time, we would have tried another period of glow lasting 60 minutes to see what the wall inventory depletion rate was. Finally, it was hoped that glow discharge cleaning in helium over the weekend would improve the effects of the boronization and possibly help the recovery process. I do think that the machine recovered very quickly. The machine was no harder to run on Monday than it had been the previous week. The carbon levels were very low, and the H/D was in the 3 to 5% range, even after the last two run of the previous week which ran very high hydrogen fraction discharges. However, the radiated power was rather high, even somewhat worse than the fiducial shot which was run well after the boronization of 5/30. The radiated power did seem to be coming down during the run, and was much better the following day after overnight ECDC in D2. The 1000627 run also produced our lowest ever H/D ratios (1 to 3%). How much the wall conditioning actually helped, if at all, will have to be determined over the next few days as we run the machine. Another run sometime in the distant future (September) would be useful in which between shot glow was run with variations in the length of glow time. We could then get a good measurement of the depletion rate. It would also be useful to do target density scans to see if we can reach a condition in which the density during the h-mode actually decreases.

Physics Operator Summaries

Entered: Jul 7 2004 04:37:11:503PM

Author: To Be Determined

Engineering Setup for 1000626 MP 273: Effects of Glow Discharge Cleaning on Boronization and Wall Conditions Boronization recovery as required MP 262: Main Chamber Recycling Session Leader: Irby/Pitcher Physics Operator: Irby Engineering Operators: Bill Cochran, G. Dekow, E. Fitzgerald --------------------------------------------------------------------- Engineering Setup: No power tests will be required. However one cycle test with pulsed gas will be taken before the run. Glow discharge cleaning should stop at 07:00 Run begins at 9:00 and ends at 17:00. Power system setup: Same as for 1000616001 Set OH1, OH2U and OH2L fizzle delays at 400ms Set TF fizzle delay at 500 ms Gas setup: B-Top 6 psi D2 Hybrid Enabled B-side lower 1 psi Argon Hybrid DISABLED C-side 30 psi D2 Hybrid Enabled J-bottom 30 psi D2 Hybrid Enabled The following Gate Valves should be ENABLED ECE, VUV The first part of the run will involve operating the machine following boronization and extensive glow discharge cleaning. We will run the fiducial shot, 1000616001, at 1 MA. RF power at the 2 MW level or better should be brought up. We will closely monitor the amount of gas required to fuel the machine as a function of shot number. We hope to see a more rapid recovery of the machine to good operational parameters. The second part of the run (MP262) will begin as soon as we get reliable startups, and we do a 30-45 minute test of between shot glow discharge cleaning. Prerun conditioning: On Saturday, 6/24, we deposited about 1600 Ang of diborane onto the vessel walls using our standard ECDC technique. ECDC in D2 was run Friday night into Saturday morning to reduce the H2 levels in the machine following the Thursday and Friday runs. Starting around 19:00 on Saturday we began glow discharge cleaning in helium. After an initial breakdown at 40 mT, we adjusted the feedback to keep us at about 10 mT from Saturday until about 13:00 on Sunday. This period was used as an initial glow conditioning time at relative high pressures and low electrode voltage and current (200-300 volts, 200 mA per electrode). On Saturday afternoon the current was brought up to the 1 amp/electrode level and the voltage rose to 350 to 400 volts. The 400 volt level is the frequently stated level at which the boron hydrides are reduced by the helium ions. Finally at 15:00 on Sunday we stopped the glow, and reduced the bias resistors from 720 ohms to 360 ohms. On restarting and after adjustments to the fill pressure we were able to bring the total current up to 2.5 to 3.5 amps at voltages ranging from 450 to 550 volts. This level was reached and maintained until Monday morning at 07:00 in a virtually arc free condition. Results: From the operational standpoint we had no problems running a post boronization plasma today. We had only one fizzle. However, the extensive glow cleaning over the weekend may have changed how effective the boronization was. From RGA data it's clear we have plenty of boron in the machine, but the radiated power levels were rather high today. The RF was working well and delivered 3.1 MW of total power from 3 antennas. Because of the long delays caused by CAMAC and power supply problems, and the time required to do the between shot glow, we did not get to Spencer's run today. However, all the goals of MP273 were accomplished (see session leader report). Problems: We had CAMAC problems at the beginning of the run. TCI was not working until Joe put the highway back to last Friday's configuration. He was trying to get the x-rays working. We also lost 2PI diode, hybrid, and HiReX data. Rejean found his Incaa had died and we didn't have a spare. A couple of hours was spent in the power room testing the EF1U supply and then doing a power test. No problem was found, but it was okay during the power test and the rest of the run. Lost trac data on shot 11. No efit Score: tests 02 duds 00 fizzles 01 plasmas 14 total 17 Details: ---------------------------------------------------------------------------- 1000626xxx irby PHYSICS_OPERATOR Jun 26 2000 8:52:52:420AM . . . . . . . . . . . . . . . . . . . . Loaded shot 1000616001 Zeroed Br0 offset consistent with the last shot from Friday Set EF4 to -1300 amps consistent with last shot from Friday Did coldstart rtnode -- data loaded, A matrix responds rtnode -- data loaded, M matrix responds rtnode -- data loaded, PID matrix responds See Discharge Cleaning Entries for details of the helium glow discharge cleaning done over the weekend. The glow was done following the deposition of about 1600 Ang of diborane using ECDC on Saturday, 6/24. The first shot today will be a no power cycle test to see what the prefill gas level is like with the walls in their current condition. ---------------------------------------------------------------------------- 1000626001 irby PHYSICS_OPERATOR Jun 26 2000 8:59:03:746AM . . . . . . . . . . . . . . . . . . . . This was a gas test. Pressure at t=0 low: added 4 ms to prefill. ---------------------------------------------------------------------------- 1000626002 irby PHYSICS_OPERATOR Jun 26 2000 9:42:53:780AM . . . . . . . . . . . . . . . . . . . . Added 4 ms to prefill Just noted that TCI did not work on test shot, probably because of changes to the CAMAC highway made yesterday. Plasma for about 0.32 s Late breakdown, fill high: ---------------------------------------------------------------------------- 1000626003 irby PHYSICS_OPERATOR Jun 26 2000 5:15:10:153PM . . . . . . . . . . . . . . . . . . . . Reduced prefill by 2 ms. Dropped early density request slightly (before 400 ms) Joe switched CAMAC highway back to last weeks configuration. Good full length shot with h-modes TCI is back! Looks like we took 20 Torr-l more gas for this shot compared to the 1000616001 fiducial. Prefill still looks high, but it ran... Carbon level is low 120 kJ of stored energy H/D 3% rising to 5% during RF ---------------------------------------------------------------------------- 1000626004 irby PHYSICS_OPERATOR Jun 26 2000 5:16:33:280PM . . . . . . . . . . . . . . . . . . . . Plasma to rampdown, 137 kJ, H/D 3 to 5% Only took 36 Torr-l that shot: already back to standard operation Pressure even higher ---------------------------------------------------------------------------- 1000626005 irby PHYSICS_OPERATOR Jun 26 2000 10:46:56:233AM . . . . . . . . . . . . . . . . . . . . Note that RGA is showing lots of diborane as we expect, but also large mass 69 peak. Reduced prefill again by 2 ms Plasma to rampdown, better h-modes, 143 kJ, RF cleaner but we did have serious arc activity on e-port. Only needed 35 T-l for that shot Got prefill down a little H/D is at the 5 or 6% level now ---------------------------------------------------------------------------- 1000626006 irby PHYSICS_OPERATOR Jun 26 2000 11:08:59:780AM . . . . . . . . . . . . . . . . . . . . Reduced prefill another 2 ms Fizzle. shot: 1000626006 may have reduced prefill too much. Br0 getting too positive? Several people enter cell to debug CAMAC problems Amanda to ECE lab to adjust grating for current field ---------------------------------------------------------------------------- 1000626007 irby PHYSICS_OPERATOR Jun 26 2000 12:42:56:310PM . . . . . . . . . . . . . . . . . . . . Added 2 ms back to prefill Reduced Br0 by 0.2 mT Took shot after about 55 minutes of delay with CAMAC fixes and cell entries Plasma into rampdown, nice h-mode, 150 kJ 2Pi diode is back: Radiation is worse than on 1000616 by 200-300 kW! Took about 35 T-l of gas again Br0 tweak seems to have worked Gas okay What is going on with Bz0? Late breakdown though Steve Wolfe noted 300 amp imbalance in the ef1 currents. Seems the ef1u is not following demand. This problem probably explains toggling of Bz0 we have seen today and in the past. ---------------------------------------------------------------------------- 1000626008 irby PHYSICS_OPERATOR Jun 26 2000 1:23:43:390PM . . . . . . . . . . . . . . . . . . . . Tried again. Plasma for 200 ms Still have problem with EF1s. Bill and Gary go to check. ---------------------------------------------------------------------------- 1000626009 irby PHYSICS_OPERATOR Jun 26 2000 1:58:31:106PM . . . . . . . . . . . . . . . . . . . . We have done 30 minutes of glow at 500 volts, 2 amps. I was unable to get the pressure low enough to produce a good glow throughout the machine. We ran at about 8 mTorr. Any lower and the electrode voltage would climb too high. Bill and Gary found nothing wrong with EF1 supply. This shot will be an EF1 test. EF1s do not look very different in the test. Next shot will be a plasma shot ---------------------------------------------------------------------------- 1000626010 irby PHYSICS_OPERATOR Jun 26 2000 2:22:30:483PM . . . . . . . . . . . . . . . . . . . . Plasma to rampdown, 112 kJ Took about 45 T-l to make the plasma --- glow may have mattered Only had e-port RF, but still a good h-mode EF1 looks fine Lots of radiation on 2Pi: 1.3 MW Still no HiReX ---------------------------------------------------------------------------- 1000626011 irby PHYSICS_OPERATOR Jun 26 2000 2:51:31:623PM . . . . . . . . . . . . . . . . . . . . Plasma to rampdown Took about 34 T-l ---------------------------------------------------------------------------- 1000626012 irby PHYSICS_OPERATOR Jun 26 2000 2:53:08:593PM . . . . . . . . . . . . . . . . . . . . PCS Repeat Plasma to rampdown, 33 t-l H/D from 4 to 6% Plasma into rampdown, but lost d-port RF again, 118 kJ Took 33 T-l; so no change from last shot ---------------------------------------------------------------------------- 1000626013 irby PHYSICS_OPERATOR Jun 26 2000 4:10:19:356PM . . . . . . . . . . . . . . . . . . . . Did another 30 minutes of glow in helium. Still not able to drop pressure low enough to get a good uniform glow. Elapsed time since last shot was about 1:05 Plasma to rampdown, took 45 T-l again, 152 kJ Bz0 getting a little too negative ---------------------------------------------------------------------------- 1000626014 irby PHYSICS_OPERATOR Jun 26 2000 4:30:28:403PM . . . . . . . . . . . . . . . . . . . . Dropped EF4 to -1280 from -1300 Plasma into rampdown, 168 kJ, 3 MW of RF, H to D at 5% Radiation about 1.8 MW on 2Pi diode Injection at .81 s probably caused d-port trip ---------------------------------------------------------------------------- 1000626015 irby PHYSICS_OPERATOR Jun 26 2000 4:54:43:763PM . . . . . . . . . . . . . . . . . . . . Repeat Plasma to rampdown, solid h-mode with very brief d-port RF interrupt Took 34 T-l of gas 2Pi peaked at 1.89 but was going down during shot ---------------------------------------------------------------------------- 1000626016 irby PHYSICS_OPERATOR Jun 26 2000 5:06:19:356PM . . . . . . . . . . . . . . . . . . . . Repeat Plasma to rampdown, 180 kJ, H to D 4 to 6% 2Pi down to 1.7 MW peak with > 3 MW of RF 33 T-l of gas ---------------------------------------------------------------------------- 1000626017 irby PHYSICS_OPERATOR Jun 26 2000 5:32:11:216PM . . . . . . . . . . . . . . . . . . . . Removed TF waggle for Rejean Plasma to rampdown, but had many injections from e-port antenna Radiated power down until the antenna started to act up 183 kJ, H to D 4 or 5%

Session Leader Comments
Jun 27 2000 08:59:08:780AM	1000626003	Spencer Pitcher	right gap too large >>>>>> reduce next shot no H-mode

Physics Operator Comments
Jun 26 2000 08:52:52:420AM		Jim Irby	Loaded shot 1000616001 Zeroed Br0 offset consistent with the last shot from Friday Set EF4 to -1300 amps consistent with last shot from Friday Did coldstart rtnode -- data loaded, A matrix responds rtnode -- data loaded, M matrix responds rtnode -- data loaded, PID matrix responds See Discharge Cleaning Entries for details of the helium glow discharge cleaning done over the weekend. The glow was done following the deposition of about 1600 Ang of diborane using ECDC on Saturday, 6/24. The first shot today will be a no power cycle test to see what the prefill gas level is like with the walls in their current condition.
Jun 26 2000 08:59:03:747AM	1000626001	Jim Irby	This was a gas test. Pressure at t=0 low: added 4 ms to prefill.
Jun 26 2000 09:42:53:780AM	1000626002	Jim Irby	Added 4 ms to prefill Just noted that TCI did not work on test shot, probably because of changes to the CAMAC highway made yesterday. Plasma for about 0.32 s Late breakdown, fill high: Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 2.1699 -8.2067 -18.5606 -114.5672 dIp/dt (kA/ms): -1.0184 -2.0335 -3.5606 -7.7570 pressure (mTorr): 0.0668 0.0675 0.0683 0.0564 Bz0 (mT): -3.8917 -1.5407 0.3038 19.2264 Br0 (mT): -0.3081 -0.9577 -0.5916 -1.9719
Jun 26 2000 05:15:10:153PM	1000626003	Jim Irby	Reduced prefill by 2 ms. Dropped early density request slightly (before 400 ms) Joe switched CAMAC highway back to last weeks configuration. Good full length shot with h-modes TCI is back! Looks like we took 20 Torr-l more gas for this shot compared to the 1000616001 fiducial. Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 2.2154 -10.7782 -26.3658 -106.7847 dIp/dt (kA/ms): -1.2717 -2.8009 -3.4357 -8.2679 pressure (mTorr): 0.0668 0.0653 0.0675 0.0590 Bz0 (mT): -3.3258 -0.3721 1.4085 18.7939 Br0 (mT): -0.3330 -0.6437 -0.7864 -2.2774 Prefill still looks high, but it ran... Carbon level is low 120 kJ of stored energy H/D 3% rising to 5% during RF
Jun 26 2000 05:16:33:280PM	1000626004	Jim Irby	Plasma to rampdown, 137 kJ, H/D 3 to 5% Only took 36 Torr-l that shot: already back to standard operation Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): -0.4015 -10.7554 -23.7262 -91.1971 dIp/dt (kA/ms): -1.2727 -2.5433 -3.3063 -6.3582 pressure (mTorr): 0.0722 0.0706 0.0722 0.0698 Bz0 (mT): -2.6649 -0.6366 0.7886 18.5044 Br0 (mT): -0.8198 -0.7528 -0.7980 -1.5098 Pressure even higher
Jun 26 2000 10:46:56:233AM	1000626005	Jim Irby	Note that RGA is showing lots of diborane as we expect, but also large mass 69 peak. Reduced prefill again by 2 ms Plasma to rampdown, better h-modes, 143 kJ, RF cleaner but we did have serious arc activity on e-port. Only needed 35 T-l for that shot Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 2.2154 -13.3496 -26.3204 -96.3627 dIp/dt (kA/ms): -1.5271 -2.7965 -3.3063 -6.1039 pressure (mTorr): 0.0668 0.0660 0.0675 0.0660 Bz0 (mT): -3.1602 -0.5830 1.1563 18.0803 Br0 (mT): -0.3708 -0.6407 -0.2059 -1.5199 Got prefill down a little H/D is at the 5 or 6% level now
Jun 26 2000 11:08:59:780AM	1000626006	Jim Irby	Reduced prefill another 2 ms Fizzle. shot: 1000626006 Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): -0.4015 -13.3723 -28.9373 -18.5606 dIp/dt (kA/ms): -1.5282 -2.9226 -2.9259 0.2532 pressure (mTorr): 0.0603 0.0610 0.0603 0.0660 Bz0 (mT): -3.4843 -1.3232 0.4096 16.9044 Br0 (mT): 0.1166 -0.2905 -0.4154 -1.4200 may have reduced prefill too much. Br0 getting too positive? Several people enter cell to debug CAMAC problems Amanda to ECE lab to adjust grating for current field
Jun 26 2000 12:42:56:310PM	1000626007	Jim Irby	Added 2 ms back to prefill Reduced Br0 by 0.2 mT Took shot after about 55 minutes of delay with CAMAC fixes and cell entries Plasma into rampdown, nice h-mode, 150 kJ 2Pi diode is back: Radiation is worse than on 1000616 by 200-300 kW! Took about 35 T-l of gas again Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 2.1926 -10.7554 -21.1548 -60.0899 dIp/dt (kA/ms): -1.2705 -2.2890 -2.1641 -5.0888 pressure (mTorr): 0.0631 0.0617 0.0624 0.0617 Bz0 (mT): -0.1096 1.9161 4.0471 19.7439 Br0 (mT): -0.3971 -0.7952 -1.3480 -1.5249 Br0 tweak seems to have worked Gas okay What is going on with Bz0? Late breakdown though Steve Wolfe noted 300 amp imbalance in the ef1 currents. Seems the ef1u is not following demand. This problem probably explains toggling of Bz0 we have seen today and in the past.
Jun 26 2000 01:23:43:390PM	1000626008	Jim Irby	Tried again. Plasma for 200 ms Still have problem with EF1s. Bill and Gary go to check.
Jun 26 2000 06:09:35:357PM	1000626009	Jim Irby	We have done 30 minutes of glow at 500 volts, 2 amps. I was unable to get the pressure low enough to produce a good glow throughout the machine. We ran at about 8 mTorr. Any lower and the eletrode voltage would climb too high. Bill and Gary found nothing wrong with EF1 supply. This shot will be an EF1 test. EF1s do not look very different in the test. Next shot will be a plasma shot
Jun 26 2000 02:22:30:483PM	1000626010	Jim Irby	Plasma to rampdown, 112 kJ Took about 45 T-l to make the plasma --- glow may have mattered Only had e-port RF, but still a good h-mode EF1 looks fine Lots of radiation on 2Pi: 1.3 MW Still no HiReX Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 2.2154 -8.1840 -23.7262 -114.5445 dIp/dt (kA/ms): -0.8924 -3.0531 -4.3225 -8.5200 pressure (mTorr): 0.0539 0.0552 0.0558 0.0498 Bz0 (mT): -2.1706 0.6757 2.0490 20.7540 Br0 (mT): -0.2923 -0.6124 -1.2448 -1.9476
Jun 26 2000 02:51:31:623PM	1000626011	Jim Irby	Plasma to rampdown Took about 34 T-l
Jun 26 2000 02:53:08:593PM	1000626012	Jim Irby	PCS Repeat Plasma to rampdown, 33 t-l H/D from 4 to 6% Plasma into rampdown, but lost d-port RF again, 118 kJ Took 33 T-l; so no change from last shot
Jun 26 2000 04:10:19:357PM	1000626013	Jim Irby	Did another 30 minutes of glow in helium. Still not able to drop pressure low enough to get a good uniform glow. Elapsed time since last shot was about 1:05 Plasma to rampdown, took 45 T-l again, 152 kJ Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): -0.4015 -10.7782 -31.5314 -80.8204 dIp/dt (kA/ms): -1.0162 -3.4335 -2.5455 -6.9952 pressure (mTorr): 0.0583 0.0583 0.0583 0.0539 Bz0 (mT): -2.7483 -1.5168 0.0541 17.4267 Br0 (mT): -0.3291 -0.4670 -0.5012 -1.7993 Bz0 getting a little too negative
Jun 26 2000 04:30:28:403PM	1000626014	Jim Irby	Dropped EF4 to -1280 from -1300 Plasma into rampdown, 168 kJ, 3 MW of RF, H to D at 5% Radiation about 1.8 MW on 2Pi diode Injection at .81 s probably caused d-port trip Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 2.2381 -10.7327 -23.7489 -106.7620 dIp/dt (kA/ms): -1.1434 -2.7998 -3.9421 -6.9963 pressure (mTorr): 0.0583 0.0583 0.0597 0.0590 Bz0 (mT): -1.6447 0.1488 2.4201 19.0838 Br0 (mT): -0.5586 -0.5878 -1.2669 -2.1381
Jun 26 2000 06:08:36:043PM	1000626015	Jim Irby	Repeat Plasma to rampdown, solid h-mode with very brief d-port RF interrupt Took 34 T-l of gas 2Pi peaked at 1.89 but was going down during shot
Jun 26 2000 05:06:19:357PM	1000626016	Jim Irby	Repeat Plasma to rampdown, 180 kJ, H to D 4 to 6% 2Pi down to 1.7 MW peak with > 3 MW of RF 33 T-l of gas Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): -0.3788 -13.3496 -28.9146 -101.5737 dIp/dt (kA/ms): -1.5271 -2.7976 -3.8150 -5.9756 pressure (mTorr): 0.0610 0.0610 0.0597 0.0603 Bz0 (mT): -2.1960 1.1165 1.4291 17.6579 Br0 (mT): -0.5737 -0.4770 -0.8426 -1.6799
Jun 26 2000 05:32:11:217PM	1000626017	Jim Irby	Removed TF waggle for Rejean Plasma to rampdown, but had many injections from e-port antenna Radiated power down until the antenna started to act up 183 kJ, H to D 4 or 5%

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:49:52:200AM	Test	Ok	Gas Test
2	09:33:47:263AM	Plasma	Ok
3	09:50:30:013AM	Plasma	Ok
4	10:10:26:843AM	Plasma	Ok
5	10:30:25:090AM	Plasma	Ok
6	10:51:20:623AM	Plasma	Ok
7	11:47:42:873AM	Plasma	Ok
8	12:12:23:090PM	Plasma	Bad	EF1U Voltage Response Problem
9	01:42:41:340PM	Test	Ok	EF1U-L PLC, 5Kamp ,100V Test
10	02:01:00:780PM	Plasma	Ok
11	02:22:04:030PM	Plasma	Ok
12	02:41:50:200PM	Plasma	Ok
13	03:48:51:657PM	Plasma	Ok
14	04:16:47:420PM	Plasma	Ok
15	04:35:43:733PM	Plasma	Ok
16	04:56:14:607PM	Plasma	Ok
17	05:17:45:437PM	Plasma	Ok