| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Jim Irby,Martin Greenwald |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Sam Pierson |
| Engineering Operator Run Comment |
| MP #402 EO Pierson SL Wolfe PO Irby |
| Session Leader Plans |
| Entered: Apr 12 2005 11:57:06:157AM |
| Author: Steve Wolfe |
Run Plan for Backup Experiment of 1050413 part 2. MP#402 "Locked mode studies at different toroidal phase" SL: wolfe This experiment will be run on 1050413 only if MP#333 is determined not to be possible. The plan for the other day scheduled for this MP, 1050415, will be substantially different because it will start with the Acoil configuration used in Hender's MP#398 that morning. The purpose of these experiments is to improve our characterization of the C-Mod intrinsic error fields, and to investigate the dependence of the 2/1 locked mode threshold on the m=1 and m=3 sidebands. A-coils should be configured [+Btop -Bbot -Gtop +Gbot] (rotated quadrupole, phi=-49 deg.). Since neither of the other experiments planned for the day should require A-coil for locked mode suppression, it would be best to set this configuration before the run. In this case, the A-coils should be DISABLED for the other experiments. Note that the A-coils should be put back in the standard configuration [+Dtop -Dbot -Jtop +Jbot] for Thursday's run. Note: Nominal intrinsic error field has phi~ -160 degrees. We will try to maximize the data in each coil configuration before moving on to the next. This plan therefore includes elements of both Day 1 and Day 2 from the MP. 1. Establish shot with 1MA, 5.4T, NL04=1.1e20, Acoil off (e.g. 1050412008, tweak nl04 program). Verify that no intrinsic locked mode appears. If it does, raise NL04. [1-2shots] 2. A) Program Acoil current to maximum (program 4000A, expect 3600A).[1 shot] B) If locked mode appears then reduce Acoil program to bracket the threshold. Otherwise, Reduce NL04 by 10% and try again. [1-3 shots] C) Program decreasing density (NL04 1.5->0.5e20) and Acoil current=1660A (program ~2100A) (B21_app~4.4G), and determine locking density. [1 shot] 3. Reverse Acoil power supply leads [-Btop +Bbot +Gtop -Gbot] (rotated quadrupole, phi=131 degrees). A) Program 4000A in Acoil [1 shot] B) If locked mode appears, bracket the threshold. Otherwise, proceed to step C. [0-3 shots] C) Repeat 2C in this orientation, Acoil current=1660A again. [1 shot] 4. Change Acoil taps to [-Btop -Bbot +Gtop +Gbot] (rotated dipole, phi=-142 degrees) A) Program Acoil for 4000A [1 shot] B) If locked mode appears, reduce Acoil current to bracket the threshold. [0-3 shots] C) Repeat 2C, but with Acoil current at maximum (4000A). [1 shot] 5. Reverse Acoil power supply leads [+Btop +Bbot -Gtop -Gbot] (rotated dipole, +38 degrees). This should be in the suppressing direction, and I don't really expect to be able to excite a locked mode, but for completeness: A) Program Acoil for 4000A [1 shot] B) If locked mode appears (unlikely) bracket the threshold [0-3shots] C) Run decreasing density shot with Acoil program at maximum (4000A program) and determine locking density. [1 shot] I don't expect to get past this point in a half-day, with tap changes. Actually, it would be doing well to get through step 3. If by some miracle we get this far, then the next case would be the standard dipole [+Dtop +Dbot -Jtop -Jbot] phi=113 degrees. The acoil current for step C would be 2560A (program about 3000). |
| Entered: Apr 12 2005 02:57:34:577PM |
| Author: Martin Greenwald |
| mp 333
The goal is to obtain the evolution of the edge temperature profile as the density limit is approached. We will run at higher q than are earlier density limit runs so that the ECE is not cut off. The basic conditions are: 6 T, 0.5 MA raise density (slowly) to limit which should be at nebar = 3.2e20 shot 1021107012 is a sample for shape and density rise We should be ready to use inner wall puffing with the ninja system - previous density limit experiments required this. The ECE should be set up to get best spatial coverage from gpc and gpc2 in the edge region (1-3 cm inside lcfs). We want edge and core TS working We want GPI and Halpha fluctuation arrays if available (If we are wildly successful, we would repeat at 0.3 MA) |
| Entered: Apr 12 2005 10:13:53:577PM |
| Author: Jim Irby |
| Session Leader Plan for Boron Injector Part of Run This run will be our first try with the boron injector during this campaign. The primary goal is to actually see some plasma effects when we run the injector. During the last run with the boron injector it was only capable of injecting a 1-5 mg of boron into the machine during a discharge, and we saw no plasma effects at all. The current injector is capable of injecting 10 to 25 mg per discharge. 25 mg of boron is a rough number for the replacement level needed to maintain boronization (5000 mg of boron over about 200 discharges) We will monitor boron lines from around the machine and use NINJA to produce CX neutrals to view. Moly levels will be monitored. The RGA will be checked for both boron and any impurities that might be injected with the boron. A new camera at k-hor will view upward with a line-of-sight outside the LCFS at material falling in from the injector located at k-top. If we think the boron is producing positive or at least neutral results we will try ICRF and see if any improvement in performance can be seen. Shot plan: 1-3 fiducial shots w and w/o ICRF at the 2 MW level 4 inject boron at low rate (2 to 4 mg total). Check RGA and other diagnostics for any bad effects of the boron 5-15 inject boron at high rates (10 to 20 mg / discharge) 16 fiducial with 2 MW of rf |
| Physics Operators Plans |
| Entered: Apr 12 2005 07:28:04:420PM |
| Author: Robert Granetz |
| Engineering setup for Wednesday, 13 Apr 2005 MP 348a: Boron injector tests (1/2 day) AND MP 333: Density limits and turbulence (1/2 day) OR MP 402: Locked modes at different phase (1/2day) Session leaders: J. Irby (MP 348a) AND ((M. Greenwald, MP 333 OR (S. Wolfe, MP 402)) Physics operator: R. Granetz Overnight ECDC in D2, bake at 60 C. Run begins at 09:00 and ends at 17:00. Power systems as on 1050329010. A-coil configuration: [+Btop -Bbot -Gtop +Gbot], but power supply NOT ENABLED. Gas Setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 2 psi Ar Hybrid enabled (PG1) leave B-side upper with whatever Hybrid disabled fill B-main (C-side) with 30 psi D2 Hybrid enabled (PG3) fill NINJA with 8 psi D2 Leave disabled to begin with Torvac setup: machine gate valves to remain open during and after shot. Enable the following gate valves, assuming no vacuum problems: ECE, VUV, Z-bolo shutters Necessary diagnostics: MP 348a: Camera view of boron shaker; boron and moly spectroscopy MP 333: GPC's, core and edge TS, and GPI and Halpha fluctuation arrays if available MP 402: GPC and SXR (for sawtooth determination of locking), HIREX ------------------------------------------------------------------------------- ICRF Setup: All transmitters in run on at 08:30. ------------------------------------------------------------------------------- Run plan: For MP 348a (boron injector tests), start with segment 2 loaded from shot 1050329010, which was a recent "RF fiducial" shot. At some point in the day, we'll switch to the second MP, which will be MP 333 unless one of the necessary diagnostics (like GPC) is not available. The plasmas for this MP will be 0.5 MA and 6.0 T, with nebar brought up to 3.2e20 m-3 (the density limit). NINJA puffing from inboard wall might be employed. The A-coils will be setup as if we will switch to MP 402, but left unpowered, so it doesn't make any difference to either of the other MP's. NOTE that the A-coils should be put back in the standard configuration [+Dtop -Dbot -Jtop +Jbot] for Thursday's run!! |
| Entered: Apr 13 2005 08:06:49:020AM |
| Author: Robert Granetz |
| Jim Irby decided to change the fiducial shot (segment 2) to 1050412003 (same as 1050406010), except that I've removed the funny gas and density programming during the flattop. This is a 1 MA, 5.4 T, lower single null with nl_04=0.8e20 m-2. |
| Entered: Apr 13 2005 09:16:32:520AM |
| Author: Robert Granetz |
| Plasma. Disrupted at t=1.35 s. Locked mode. It turns out that the A-coil power supply was enabled and gave 1.5 kA. Lots of sparkles seen on the Boron camera, maybe from the boron shaker. Next shot: program A-coil current for zero kA. |
| Entered: Apr 13 2005 09:57:00:520AM |
| Author: Robert Granetz |
| Plasma. Full-length. nl_04=0.85e20 m-2, Ip=1.0 MA, Btor=5.4 T. A-coil current is near zero. But there is still a locked mode starting at t=1.3 s. More speckles seen on the boron camera. Next shot: re-arrange A-coils back to standard configuration and program them at 2 kA. Also tweak up the early CLEARIN to see if the brief re-limiting at cross-over can be avoided. Also turn on 2 MW of RF starting at t=0.9 s. |
| Entered: Apr 13 2005 10:11:08:210AM |
| Author: Robert Granetz |
| Plasma. Good shot. 2 MW of ICRF gave a long ELMy H-mode. Speckles on the boron camera. No sign of a locked mode. Actual A-coil current is 1.5 kA. Plasma just barely briefly limited at cross-over. Next shot: turn off boron shaker. Also tweak early CLEARIN some more. |
| Entered: Apr 13 2005 10:29:11:727AM |
| Author: Robert Granetz |
| Plasma. Good shnot. Speckles pretty much disappeared from the boron view, as we hoped (since the boron injector was turned off for this shot). Prf=2 MW. Long H-mode. Next shot: turn boron injector on earlier and higher rate. Turn off RF. |
| Entered: Apr 13 2005 10:40:16:583AM |
| Author: Robert Granetz |
| Plasma. Good shot. Ohmic. Lots more from the boron shaker. Next shot: repeat, except start the boron injection even earlier in the shot. Keep the RF off. |
| Entered: Apr 13 2005 11:00:28:380AM |
| Author: Robert Granetz |
| Fizzle. Next shot: increase Br0 offset by 0.5 mT |
| Entered: Apr 13 2005 11:12:07:193AM |
| Author: Robert Granetz |
| Plasma. Good shot. Ohmic. Lots of boron injection. Bruce sees a large enhancement in boron light everywhere except in the divertor. Earl reports that Zeff also increased slightly (by about 0.1-0.2). Next shot: turn on RF. Move start of boron injector later, to be the same as on shot 5. |
| Entered: Apr 13 2005 11:14:58:287AM |
| Author: Robert Granetz |
| Plasma. Good shot. Lots of speckles in the boron camera view. Prf=2 MW. H-mode. Next shot: no boron injection, but leave the RF on. |
| Entered: Apr 13 2005 11:30:09:070AM |
| Author: Robert Granetz |
| Plasma. Good shot. Very few specks in the boron view, as expected. Prf=2 MW. ELMy H-mode. Next shot: PCI will turn on from 0.8-1.3 s. Boron shaker will be back on, starting early. RF will also remain on. |
| Entered: Apr 13 2005 11:46:05:430AM |
| Author: Robert Granetz |
| Plasma. Good shot. Prf=2 MW. Lots of speckles on the boron camera view. ELMy H-mode. We have PCI data starting with this shot. Bruce reports that there was no difference in the molydenum signal between this shot (with boron) and the previous shot (without boron). (Both had 2 MW of ICRF) Next shot: start boron shaker even earlier (t = -0.5 s). RF on. |
| Entered: Apr 13 2005 11:53:06:367AM |
| Author: Robert Granetz |
| Plasma. Good shot. Prf=2 MW. ELMy H-mode. Lots of speckles. Next shot: ramp the RF from 0.6 to 2.0 MW in order to see if the H-mode threshold power has changed with the boron shaker. |
| Entered: Apr 13 2005 12:26:01:373PM |
| Author: Robert Granetz |
| Plasma. Good shot. Prf ramped from 0.6 to 2.0 MW. The H-mode started as soon as the RF turned on (i.e. at 0.6 MW). Don't know if that's due to the boron shaker or not. Next shot: no changes. Keep the RF ramp, but turn off J-port, so the power will be only half as much, i.e. 0.3 -> 1.0 MW. |
| Entered: Apr 13 2005 12:30:10:513PM |
| Author: Robert Granetz |
| Plasma. Good shot. Prf ramped from 0.3 to 1.0 MW. H-mode was delayed to t=1.25 s, which was at an RF power of 0.9 MW. Next shot: repeat, no changes. |
| Entered: Apr 13 2005 12:45:17:453PM |
| Author: Robert Granetz |
| Plasma. Good shot. Very similar to previous shot in terms of the H-mode timing and threshold. Next shot: Prf = 3.0 MW (steady), starting at t=0.6 s. |
| Session Leader Summaries |
| Entered: Apr 13 2005 05:19:49:750PM |
| Author: Martin Greenwald |
| Results:
MP 333 - looking for temperature profile evolution as density limit disruptions are approached. We got the data we were looking for. While many of the shots had serious marfes and poloidal detachment, there were several clean ones at 0.5 and 0.6 MA. At first glance, it looks like the temperature profile shrinks about 3 cm, then sits at that point for a considerable length of time before the disruption. It is also worth noting that the radiated power fraction can be static throughout the high density phase of the shot. Note shot 29 for example, where Prad/Ptot ~ 0.5 for about 1 second. Shots for further analysis: 1050413020 1050413025 1050413027 1050413029 |
| Entered: Apr 14 2005 12:46:58:390AM |
| Author: Jim Irby |
| The primary goal of this 1/2 run day was accomplished (shots 01 to 17). The boron injector did in fact put boron into the plasma. It was clearly seen on the k-hor boron camera and also on the spectroscopy, both passive and CX based. Several mg of boron were deposited into several discharges. It took up to 1 s for the boron to make it from the top of the vessel to where it entered the plasma. Most of the boron, at least what we could see, entered the plasma between 20 and 30 cm above the midplane. This range of heights is consistent with particles falling down the vertical port through the space constrained radially between the upper ceiling tiles and the outer edge of the port and toroidally by the upper gussets. Between 1 and 3 MW of ICRF was coupled to the plasma during most discharges to see if the boron had any affect on the h-mode threshold. The threshold did not get any lower with the addition of the boron, remaining about 900 kW. We also saw very little if any increase in z_eff, indicating very little of the boron actually made it into the core plasma. There was also no indication that the boron was accumulating from the spectroscopy. Boron was not seen on the primary RGA, though it is not clear that we should have seen elemental boron for a time long enough to be seen. Our new RGA, setup to trend just a few masses with much better time resolution did show boron transiently following the shot. To take 10 mg of boron from a solid to a completely stripped ion would require about 60 kJ of energy from the plasma. Since we did not see any large changes in stored energy, temperature, etc, we have another indication that the boron remained at the edge of the plasma. The size of the boron particles (50 to 90 um) was chosen expecting it to penetrate approximately 1 cm inside the LCFS. However, it appears that larger particles would have been better. Depending on the size distribution of the particles, 10 mg of boron represents anywhere from 1000 to 4000 particles. Typically 20 to 50 boron flashes were seen on the camera in each of 15 to 20 frames, so a large fraction of the boron either missed the plasma, was out of sight of the camera, or was too dim to be seen. A line filter for a visible boron line may have helped here as would a pipe down the vertical port to guide the boron into a more well defined location. Finally, a change in the character of the flashes could be seen when the ICRF was applied. The flashes went from extended several cm long streaks that generally moves along field lines w/o rf, to shorter streaks with more randomly directed trajectories with rf. |
| Physics Operator Summaries |
| Entered: Apr 13 2005 05:02:49:827PM |
| Author: Robert Granetz |
| Physop summary for Wednesday 13 April 2005: We successfully ran two miniproposals today: MP 348a: Boron injector tests (shots 1-17) MP 333: Density limits and turbulence (shots 18-30) The machine ran very well today, with no problems, not even with the computers. Boron particles from the shaker were clearly observed on the "Boron" video view at K-port, and Bruce reported significant increases in boron spectroscopic lines everywhere except in the divertor. RF was run up to 3 MW, which produced long, dithering/ELMy H-modes. The density limit disruptions were run at 0.5 MA, 0.35 MA (one shot only), 0.65 MA, and 0.55 MA. Good GPC and TS core and edge temperature profiles were obtained on many of the discharges. There were some pretty weird features seen on the density evolution, some due to big marfes, some possibly due to injections. Scorecard: 30 plasmas 1 fizzle 0 duds 0 tests or no-power shot cycles 0 beam-into-gas calibration shots with B-field(s) ---------- 31 total shot cycles |
| Session Leader Comments | |||
| Apr 13 2005 08:26:09:693AM | Jim Irby | boron injector has been installed on k-top and loaded with 3.5 g of boron firewire camera has been installed at k-hor viewing upward outside of lcfs boron injector may have a small leak: mass 28 increases from .9e-9 to 1.3e-8 when injector gatevalve is opened. This issue did not affect yesterday's run, so we will accept it for now. | |
| Apr 13 2005 09:18:17:960AM | 1050413001 | Jim Irby | boron injector setup for 4 pulses starting at 0.0 s (4 mg): pellets should arrive at 0.7 s may have seen something from the injector --- had an early disuption, but it may have also been improper setup of a-coils. cameras are working nice spike on 2Pi at 1.1 s good scattered light signal from boron injector --- but boron continued to fall by longer than it should have! |
| Apr 13 2005 09:50:08:740AM | 1050413002 | Jim Irby | repeat w/o a-coils no change in boron injector settings good shot lots of flashes on k-hor camera spikes on 2Pi diode and soft-xray start as early as 0.5 s rga scope looks okay: mass 32 and 48,49 up some from last shot yesterday h/(h+d) 3.7% at 1 s stopped for 30 minutes to reconfigure a-coils |
| Apr 13 2005 10:12:41:380AM | 1050413003 | Jim Irby | shot with a-coils in proper configuration just noticed that k-hor boron view is mirror reversed good shot got 2 MW of rf and nice h-mode lots of flack on the boron camera --- beginning to believe it is boron |
| Apr 13 2005 10:29:44:553AM | 1050413004 | Jim Irby | boron injection delayed to 2 s for baseline shot: only 1 pulse good shot one one flash on the boron camera |
| Apr 13 2005 10:43:33:100AM | 1050413005 | Jim Irby | boron starting at -0.25, 10 Hz, 10 pulses lots of flashes on camera starting around 0.7 s h/(h+d) 4.5% at 1 s |
| Apr 13 2005 10:52:07:880AM | 1050413006 | Jim Irby | boron starts at -0.5 s, 10 HZ, 15 pulses Bruce reports seeing much more boron everywhere except the divertor |
| Apr 13 2005 11:12:59:570AM | 1050413007 | Jim Irby | boron start back to -0.25 s, 10 Hz, 15 pulses --- Bruce wanted more time at beginning of shot to see baseline changes in boron level will have 2 MW of rf -- should help moly measurements fizzle |
| Apr 13 2005 11:22:34:130AM | 1050413008 | Jim Irby | rf at 2 MW good shot nice h-mode boron: -.25 s, 10 Hz, .25 duty, 15 pulses beautiful images of boron on boron camera |
| Apr 13 2005 11:30:30:413AM | 1050413009 | Jim Irby | boron injector off until 2 s with one pulse good shot boron camera clear of boron flashes |
| Apr 13 2005 11:46:41:770AM | 1050413010 | Jim Irby | boron: -0.25 s, 10 Hz, .25 duty, 15 pulses should have PCI data from 0.8 to 1.3 s good shot not a lot of boron flashes until late: .95 s or so? Bruce reports lots of boron in the core/CX on pervious shots, but no change in moly levels h/(h+d) 4.5% at 1 s |
| Apr 13 2005 12:04:14:960PM | 1050413011 | Jim Irby | boron: -0.5 s, 10 Hz, .25 duty, 15 pulses good shot boron in plasma as early as 0.25 s h/(h+d) 3.5 to 4.5% communication error on RGA data TCI baseline suspect |
| Apr 13 2005 12:21:50:830PM | 1050413012 | Jim Irby | boron repeat plan to ramp ICRF power and look for threshold power level good shot first flash at 0.3 s, but real shower starts 0.5 s |
| Apr 13 2005 12:57:01:530PM | 1050413014 | Jim Irby | boron: -.5 s, 15 Hz, .25, 25 pulses good shot |
| Apr 13 2005 01:31:16:780PM | 1050413015 | Jim Irby | boron repeat only got 2 MW of rf (asked for 3 MW) shower of boron has different character with rf --- smaller more numerous flashes |
| Apr 13 2005 01:42:59:123PM | 1050413018 | Martin Greenwald | First shot in density limit part of run
Density rises too fast, reaches density limit at 0.55 sec disrupts at 0.84 sec |
| Apr 13 2005 01:52:26:063PM | 1050413019 | Martin Greenwald | Similar to previous shot
slow down density rise on next shot |
| Apr 13 2005 02:14:48:860PM | 1050413020 | Martin Greenwald | Better shot (turned off ninja)
disrupted at 1.3 seconds density reaches just above 3e20 ~ to limit |
| Apr 13 2005 02:17:55:343PM | 1050413021 | Martin Greenwald | Got anomalous density rise at 0.48 second
line average density goes to 3.6e20 then marfes and disrupts |
| Apr 13 2005 02:38:57:797PM | 1050413022 | Martin Greenwald | Shot lasts longer, marfes strongly toward end
probably detaching too kappa has sagged to 1.5, raise for next shot |
| Apr 13 2005 03:15:35:063PM | 1050413023 | Martin Greenwald | Disrupts at 1.07 sec
poloidal detachments and marfes |
| Apr 13 2005 03:15:06:203PM | 1050413024 | Martin Greenwald | Disrupts at 1.17 sec
poloidal detachments and marfes |
| Apr 13 2005 03:26:31:093PM | 1050413025 | Martin Greenwald | cleaner shot
disrupts without marfe or detachement |
| Apr 13 2005 03:44:11:373PM | 1050413026 | Martin Greenwald | current lowered to 0.35 - probably not a good idea
lots of marfes and detachments going up in current for the next shot |
| Apr 13 2005 04:00:29:953PM | 1050413027 | Martin Greenwald | Ip up above 0.6 MA
density reaches 4e20 disrupts cleanly without signs of disruption or detachment |
| Apr 13 2005 04:17:02:843PM | 1050413028 | Martin Greenwald | ugly shot, early disruption |
| Apr 13 2005 04:30:29:327PM | 1050413029 | Martin Greenwald | good shot
0.6 MA nebar disrupts at 3.8e20 |
| Apr 13 2005 04:48:43:263PM | 1050413030 | Martin Greenwald | current lowered to 0.55
detaches and marfes at end of shot |
| Apr 13 2005 05:04:17:953PM | 1050413031 | Martin Greenwald | bad marfes again... |
| Physics Operator Comments | |||
| Apr 13 2005 12:56:50:437PM | 1050413015 | Robert Granetz | Plasma. Good shot. Prf=2.2 MW (E didn't stay on). Dithering/ELMy H-mode. Lots of speckles in the boron camera view. Next shot: try again for 3 MW. Might be last shot for this MP today. |
| Apr 13 2005 01:14:21:140PM | 1050413016 | Robert Granetz | Plasma. Good shot. Prf=3 MW, but the H-mode was very low quality. Lots of speckles. Next shot: start boron shaker earlier. Delay the start of RF until t=0.75. 3 MW. This will be the last shot of MP 348a. |
| Apr 13 2005 01:24:48:420PM | 1050413017 | Robert Granetz | Plasma. Good shot. Very similar to previous shot. Prf=3 MW. Lousy H-mode. End of MP 348a. Next shot: start MP 333. Ip=0.5 MA, Btor=6.0 T, nebar ramping up to 3.2e20 m-3, which is the density limit at this current. |
| Apr 13 2005 01:49:43:780PM | 1050413018 | Robert Granetz | Plasma. Disrupted at 0.8 s. This shot is under SSEP control and it ended up being upper null. That is probably because I forgot to load the zeroed offset on SSEP. Next shot: re-load the shot with the SSEP reduce to -10 mm and the offset zeroed. |
| Apr 13 2005 01:57:10:017PM | 1050413019 | Robert Granetz | Plasma. Lower null. May have been a density limit disruption. Big marfe on the TCI. Next shot: slow down the density ramp. Also tweak up Btor by 0.1 T |
| Apr 13 2005 02:08:16:500PM | 1050413020 | Robert Granetz | Plasma. Good shot. The density limit disruption occurred at t=1.33 s, at the correct density of nebar=3.2e20 m-3. The density time waveform was a little weird, but the gas feedback is working correctly. Got good GPC and TS profiles (core and edge). Next shot: repeat, no changes |
| Apr 13 2005 02:24:00:890PM | 1050413021 | Robert Granetz | Plasma. Disrupted at 0.81 s, well before the density limit was reached. Very bizarre density behavior, with a big inexplicable bump in the density around 0.5-0.6 s. NINJA was not puffing. Next shot: try again, no changes |
| Apr 13 2005 02:40:36:970PM | 1050413022 | Robert Granetz | Plasma. Good shot. Density behavior looked good on this shot. Good GPC and TS profiles. Next shot: program ZXL to ramp down by 2 cm in order to keep the elongation from decreasing during the shot. |
| Apr 13 2005 03:06:50:420PM | 1050413023 | Robert Granetz | Plasma. Not a pretty looking shot due to all the marfing, I think. At EF1 cross-over the plasma briefly becomes limited. Elongation stays constant except for the notch when it briefly limits. Next shot: repeat, no changes. |
| Apr 13 2005 03:22:34:267PM | 1050413024 | Robert Granetz | Plasma. Ugly. More bizarre density features. Lots of early hard x-rays. Next shot: try one more time at these parameters. Also tweak up the early gas puffing. |
| Apr 13 2005 03:29:46:920PM | 1050413025 | Robert Granetz | Plasma. Good shot. Disrupted at the proper density. Next shot: drop Ip to 350 kA and nebar to 2.0e20 m-3. |
| Apr 13 2005 03:40:30:450PM | 1050413026 | Robert Granetz | Plasma. Lots of density features. Next shot: raise Ip to 0.65 MA and nebar up to 4e20 m-3. |
| Apr 13 2005 03:57:58:267PM | 1050413027 | Robert Granetz | Plasma. Good shot. 0.62 MA, 6.0 T, nebar about 4e20 m-3 at the density limit disruption, as expected. Next shot: repeat, no changes |
| Apr 13 2005 04:26:02:063PM | 1050413028 | Robert Granetz | Plasma. Stop to get one of Amanda's GPC2 crates back online. Next shot: no changes. |
| Apr 13 2005 04:38:28:657PM | 1050413029 | Robert Granetz | Plasma. Good shot. Disrupted at t=42 s, around the density limit. Got GPC2 data this time. Next shot: "Good question," said Martin. Drop the current to 0.55 MA and the density accordingly. |
| Apr 13 2005 04:51:39:140PM | 1050413030 | Robert Granetz | Plasma. Good shot. Disrupted at t=1.17 s, at about the density limit for this current. Next shot: repeat, no changes. This will be the last shot. |
| Apr 13 2005 05:01:03:687PM | 1050413031 | Robert Granetz | Plasma. Good shot. End of run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:03:44:147AM | Plasma | Ok | |
| 2 | 09:18:43:977AM | Plasma | Ok | |
| 3 | 10:02:01:867AM | Plasma | Ok | |
| 4 | 10:14:41:583AM | Plasma | Ok | |
| 5 | 10:30:28:990AM | Plasma | Ok | |
| 6 | 10:43:06:147AM | Plasma | Ok | |
| 7 | 10:55:41:630AM | Plasma | Ok | |
| 8 | 11:08:19:710AM | Plasma | Ok | |
| 9 | 11:21:11:367AM | Plasma | Ok | |
| 10 | 11:33:51:617AM | Plasma | Ok | |
| 11 | 11:46:51:803AM | Plasma | Ok | |
| 12 | 12:08:40:130PM | Plasma | Ok | |
| 13 | 12:23:02:953PM | Plasma | Ok | |
| 14 | 12:36:31:453PM | Plasma | Ok | |
| 15 | 12:49:00:017PM | Plasma | Ok | |
| 16 | 01:05:52:717PM | Plasma | Ok | |
| 17 | 01:18:11:000PM | Plasma | Ok | |
| 18 | 01:32:35:937PM | Plasma | Ok | |
| 19 | 01:47:09:953PM | Plasma | Ok | |
| 20 | 01:59:35:017PM | Plasma | Ok | |
| 21 | 02:12:19:767PM | Plasma | Ok | |
| 22 | 02:28:09:920PM | Plasma | Ok | |
| 23 | 02:56:23:687PM | Plasma | Ok | |
| 24 | 03:11:44:733PM | Plasma | Ok | |
| 25 | 03:24:12:313PM | Plasma | Ok | |
| 26 | 03:36:49:420PM | Plasma | Ok | |
| 27 | 03:52:35:390PM | Plasma | Ok | |
| 28 | 04:07:54:250PM | Plasma | Ok | |
| 29 | 04:27:54:420PM | Plasma | Ok | |
| 30 | 04:44:34:233PM | Plasma | Ok | |
| 31 | 04:57:13:720PM | Plasma | Ok | |