| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Bruce Lipschultz,Earl Marmar |
| Physics operator(s): | Bill Rowan,Earl Marmar |
| Engineering operator(s): | Bill Parkin,Ed Fitzgerald,Gary Dekow |
| Engineering Operator Run Comment |
| MP539 Development of enhanced L-mode scenario SL: Lipschultz PO: Rowan |
| Session Leader Plans |
| Entered: Apr 15 2008 09:39:38:250PM |
| Author: Bruce Lipschultz |
| All shots will be run at B=5.3T, shot 1071220002 (USN) can be used for the magnetic equilibrium. RF ramp from 0.7 to 1.6s.
1. Start with nl04=0.6x1020 m-2 and ramp the ICRF power from 1-2 MW. Lower the density towards step 2, vary the power ramp and gaps till all diagnostics are satisfied and the threshold power is determined. Should have the RF power reach a value 0.5 MW above the threshold to get a decent measure of the H-mode before the end of the discharge before moving on to the next step. (4-6 discharges) 2. Lower the density to nl04 = 0.4 if not already done to see if the threshold is affected (if problems with lowering the density skip to step 4). Assuming that the threshold rises gradually raise the power ramp to continue to achieve H-mode. Flatten out the power ramp to make the L-H transition occur near the end of the discharge (4-6 discharges). 3. Find the L-H threshold and assess both L- and H- confinement at nl04=0.6 and 0.8. 4. Using nl04=0.8 gradually raise the upper x-point (~ 1cm per discharge) such that it comes closer and closer to the upper divertor. If the threshold rises increase the power accordingly. (6-8 discharges). 5. Returning to the original equilibrium and nl04 ~ 0.8 gradually increase the upper triangularity over several discharges from ~ 0.4 to ~0.6 or higher if possible (change in 0.1 per discharge). Again, if the threshold increases, increase the power ramp to continue to achieve H-mode. (4-5 discharges) 6. Return to case that gives the best increase in threshold together with the best L-mode confinement to repeat for several discharges for the diagnostics to obtain the best data possible. Raise the current to 1 or 1.2 MA to achieve the best confinement if desired. |
| Entered: Apr 16 2008 02:48:29:930PM |
| Author: Earl Marmar |
| We are planning to switch to MP496, High Performance Operation at Ip>1.2 MA, for about 1 hour (~4 shots) this afternoon, starting at about 4:00 pm.
start from 1080409030 (1.35 MA, USN) - probably needs different power supply settings relative to what we had earlier in the day raise B-toroidal to 5.6 Tesla in segment 2 (check the plc limit) Go for 4.5 MW ICRF, steady from .7 to 1.2 seconds, then off Speed up the Ip rampdown to be about 2 MA/sec, still starting at 1.15 seconds (segment 3, I believe) Start the TF rampdown at 1.2 seconds (segment 3, again, I think) decrease ZXU by 5 mm decrease upper triangularity shot by shot, increasing RXU ~10 mm at a time (starting with an increase for the first shot). Keep an eye on q_95, which was just below 3 for 1080409030. Adjust prefill pressure for cryopump off. The idea is to try to destabilize large ELMs before the radiated power kills the H-mode. |
| Physics Operators Plans |
| Entered: Apr 15 2008 01:53:40:090PM |
| Author: Bill Rowan |
| Run Plan for April 16, 2008, Run 1080416
MP539 Development of enhanced L-mode scenario SL: Lipschultz PO: Rowan ----------------- Engineering Setup ----------------- Run begins at 09:00 and ends at 17:00 Power systems as on:1071220002 Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid Enabled Gas setup: Fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid DISABLED (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill NINJA with 10 psi D2 DISABLED Enable gatevalves and shutters: ECE, VUV, DNB, Z-bolo Torvac gatevalve toggle (yes/no): Boronization(yes/no): yes Overnight ECDC (yes/no): no ICRF(yes/no): yes LH(yes/no): no DNB(yes/no): yes Cryopump (yes/no): no Vessel temperature: 35/35/35 -------------------------------------- Boronization Parameters (if requested) -------------------------------------- Follow recipe for 1080409 except TC6: 60 mT Follow by ECDC in He for as many hours as practical. End by 7am Post boronization ECDC ---------------------------- Gas: He sweep: 44/103/45 cm scan: 20/120 s Pressure: 5e-5 Torr ---------------------- Ar puff off at the beginning of run. Initial pulselength of 100 ms. DNB requested at a minimum of 6A. All shots will be run at B=5.3T, shot 1071220002 (USN) can be used for the magnetic equilibrium. RF ramp from 0.7 to 1.6s. 1. Start with nl04=0.6x1020 m-2 and ramp the ICRF power from 1-2 MW. Lower the density towards step 2, vary the power ramp and gaps till all diagnostics are satisfied and the threshold power is determined. Should have the RF power reach a value 0.5 MW above the threshold to get a decent measure of the H-mode before the end of the discharge before moving on to the next step. (4-6 discharges) 2. Lower the density to nl04 = 0.4 if not already done to see if the threshold is affected (if problems with lowering the density skip to step 4). Assuming that the threshold rises gradually raise the power ramp to continue to achieve H-mode. Flatten out the power ramp to make the L-H transition occur near the end of the discharge (4-6 discharges). 3. Find the L-H threshold and assess both L- and H- confinement at nl04=0.6 and 0.8. 4. Using nl04=0.8 gradually raise the upper x-point (~ 1cm per discharge) such that it comes closer and closer to the upper divertor. If the threshold rises increase the power accordingly. (6-8 discharges). 5. Returning to the original equilibrium and nl04 ~ 0.8 gradually increase the upper triangularity over several discharges from ~ 0.4 to ~0.6 or higher if possible (change in 0.1 per discharge). Again, if the threshold increases, increase the power ramp to continue to achieve H-mode. (4-5 discharges) 6. Return to case that gives the best increase in threshold together with the best L-mode confinement to repeat for several discharges for the diagnostics to obtain the best data possible. Raise the current to 1 or 1.2 MA to achieve the best confinement if desired. |
| Session Leader Summaries |
| Entered: Apr 17 2008 08:20:41:880PM |
| Author: Bruce Lipschultz |
| 1080416
MP539 Development of enhanced L-mode scenario SL: Lipschultz PO: Rowan Generally made it through run plan with results, while quite interesting, did not support the goals of the mp. In particular we did not find a strong dependence of H-mode threshold power on the various plasma characteristics we varied for these USN plasmas: upper x-point to upper divertor distance, upper triangularity, density and current. More details below with a description of the shot range corresponding to each scan. But basically the changes we made had the biggest effect in radiation which in turn affected the threshold power. We did find a number of characteristics of the L-mode preceding an H-mode that are more of use for understanding L-H transitions. We already knew that the L-mode can have confinement above H89 ~ 1. But today we saw on a number of discharges that the L-mode confinement appeared to have a transition to better confinement before the H-mode. Probably the best example was shot 12. During this 'good' L-mode period the stored energy increases at a higher rate and the radiated power can drop (the decrease in radiated power also correlated with the NINJA injection on shot 12). At the same time the QC mode seemed to come up and strengthen. On a discharge where we forced the power to be flat at ~ the power needed to be just below H-mode thereshold (21) the QC mode lasted for 100s of ms. Rachael's passive CXRS measurements (DNB died) at the outer edge showed variations in the poloidal velocity profile before the H-transition with a well starting to form. In the high current discharges very high poloidal velocities were measured (30 km/s) and there seemed to be 2 poloidal velocity wells. Another unusual finding in today's run was the highest triangularity discharges (16-17). Those transitioned into EDA H-modes at relatively low density - a density where we usually expect ELM-free behavior. On top of that shot 16 had what looked like ELMs on top of the EDA. One particularly strange behavior was that when we raised the plasma current (22-25) we found the plasmas had very high radiated power. In contrast when Earl came in and pushed the current up to 1.35 MA (shot 28 on) the confinement in L-mode (up to H89 ~ 1.4) was and the radiated power seemed under control. These same discharges had stored energies over 200 kJ and Ti and Te reaching the 1000 eV region. Specifics: shots 1-4 tuneup shots 6-12 scan upper x-point upwards. The radiated power increased as well as the threshold as the x-pt was moved (zxu went from 40.9 - 43 cm and radiated power went from 190 - 600 kW). shots 14-17 scan the upper x-pt inwards (58 - 49 cm) giving an upper triangularity scan of 0.4 - 0.8. The lower triangularity was increased for shot 17. As mentioned shot 16 had an EDA like H-mode (constant density and QC mode) but with ELM-like spikes. shots 18-21: a small density scan. Not much control. Not any discernable effect. shots 22-25: 1 MA but no difference other than very high radiated powers in L-mode (4 MW). shots 26-27: Effort to go back to high triangularity at high power. But radiated power was also high. shots 28-33: Very good stored energy in L-mode (over 200 kJ) and H89 ~ 1.4. Had problems with disruptions. A scan of RXU first outward and then inward was done; no obvious effect. |
| Physics Operator Summaries |
| Entered: Apr 18 2008 09:14:17:313AM |
| Author: Bill Rowan |
| The run today was in support of three miniproposals. The first 27 shots were for MP539 Development of enhanced L-mode scenario and were based on 1071202002. The last two hours of the day were for MP 496, High Performance Operation and were based on 1080409030. The last shot was given to Alex for a locked mode attempt based on 1080215001. A locked mode was observed.
Shots 001 through 034 were USN. Shot 035 (locked mode) was LSN. There were a few early disruptions which were typically associated with Mo injection. The x-point scans in in support of MP 539 may have been accompanied by increased Cu in the plasma. Both these observations were based on information from Matt. Some early disruptions could not be assoicated with Mo injection possibly because the disruption occurred too quickly. The leak returned a few shots before 023. This required the usual long recovery prior to 023. The shot following the leak was a fizzle although the prefill pressure seemed okay. The fizzle may have been due to radically changed wall conditions which changed yet again on the small plasma formed in the fizzle. At the last minute, the cryopump was added to the run. The operators got it running quickly, and controlled it quite well through the day. In general, the cryo ran well. The few burps observed did not interfere with operation. At one point during the run it seemed to stop pumping and required additional regeneration. This was associated with the leak and did not cause additional delay. DNB invertor 1 failed during shot 005. At this point, 6 of the 8 invertors were still in operation. The beam was shut down for the rest of the day and will remain shut down until one of the invertors is repaired. Score Card 33 plasmas 02 fizzles 00 duds 35 total |
| Session Leader Comments | |||
| Apr 16 2008 09:17:13:050AM | 1080416001 | Bruce Lipschultz | shot 1:
800 kA nl04 above 1 with the rf. L-mode. Midplane pressure ~ 1mT. PRF ~ 1 MW with basically just J Try again with the cryopump and hopefully higher power. |
| Apr 16 2008 09:32:03:983AM | 1080416002 | Bruce Lipschultz | shot 2:
800 kA nl04 slightly below 1 with the rf. L-mode. Midplane pressure ~ 0.4mT maximum - cryopump on. PRF ~ 2 MW Keep increasing power to outgas surfaces. |
| Apr 16 2008 09:44:51:057AM | 1080416003 | Bruce Lipschultz | shot 3:
800 kA nl04 slightly ~ 1 with the rf L-mode. H-mode as well. Midplane pressure ~ 0.5mT maximum - cryopump on. PRF ~ 3 MW Keep increasing power to outgas surfaces. |
| Apr 16 2008 09:59:37:550AM | 1080416004 | Bruce Lipschultz | shot 4:
800 kA nl04 slightly ~ 1 with the rf L-mode. H-modes as well. Midplane pressure ~ 0.4mT maximum - cryopump on. PRF ~ 3-4 MW but not staying on Changed in the inner and outer gaps to ~ 1 and 1.5 cm. Outer gap had some issues with H-modes. Raise the upper x-point by a cm. Currently ~ 39.8 cm. EFIT claimes upper gap of 7.6 cm. |
| Apr 16 2008 10:16:24:830AM | 1080416005 | Bruce Lipschultz | shot 5:
800 kA nl04 slightly ~ 1 with the rf L-mode. H-modes as well. Midplane pressure ~ 0.3mT initially in H-modes - cryopump on. PRF ~ 3 MW but not staying on Try again to raise the upper x-point by a cm. Currently ~ 39.6 cm. |
| Apr 16 2008 10:31:24:983AM | 1080416006 | Bruce Lipschultz | shot 6:
800 kA ZXU ~ 40.9 cm so up over a cm nl04 slightly ~ 0.8 with the rf L-mode. H-modes 2.4 MW Midplane pressure ~ 0.2-0.3mT initially in H-modes - cryopump on. PRF ~ ramp to 3 MW Raise the upper x-point by a cm again. |
| Apr 16 2008 11:14:14:873AM | 1080416007 | Bruce Lipschultz | shot 7:
800 kA ZXU ~ 42.2 cm so up over a cm nl04 slightly ~ 0.8 with the rf L-mode. H-modes 2.8 MW Looks like there is some transition to better L-mode confinement just before the H-mode (60 ms); the stored energy slope changes and the Ohmic power drops. Midplane pressure ~ 0.2-0.3mT initially in H-modes - cryopump on. PRF ~ ramp to 3 MW Raise the upper x-point by a cm again. |
| Apr 16 2008 11:16:00:000AM | 1080416008 | Bruce Lipschultz | shot 8:
800 kA ZXU ~ 42.2 cm nl04 slightly ~ 0.8 with the rf L-mode. H-mode transition at 2.8 MW Looks like there is some transition to better L-mode confinement just before the H-mode (60 ms); the stored energy slope changes and the Ohmic power drops. Midplane pressure ~ 0.2mT initially in H-modes - cryopump on. PRF ~ ramp to 3 MW Ar puff on for 75 ms Raise the x-point by another cm |
| Apr 16 2008 11:17:38:657AM | 1080416009 | Bruce Lipschultz | shot 9:
800 kA ZXU ~ 43.2 cm but it disrupts nl04 slightly ~ 0.8 with the rf L-mode. H-mode transition at 2.8 MW Looks like there is some transition to better L-mode confinement just before the H-mode (60 ms); the stored energy slope changes and the Ohmic power drops. Midplane pressure ~ 0.2mT initially in H-modes - cryopump on. PRF ~ ramp to 3 MW Ar puff on for 75 ms Elongation quite high - 1.84 Lower the upper x-point by a 1/2 cm. Raise the lower x-point by 0.5 cm |
| Apr 16 2008 11:17:52:410AM | 1080416010 | Bruce Lipschultz | shot 10:
fizzle |
| Apr 16 2008 11:43:16:397AM | 1080416011 | Bruce Lipschultz | shot 11:
no RF, L-mode |
| Apr 16 2008 09:08:04:590PM | 1080416012 | Bruce Lipschultz | Shot 12:
800 kA ZXU ~ 42.3 cm nl04 slightly ~ 0.8 with the rf L-mode (0.4 before). H-mode transition at 3.0 MW However, the radiated power is large as well Looks like there is some transition to better L-mode confinement just before the H-mode (60 ms); the stored energy slope changes (adds another 10 kJ before the H-mode) and the Ohmic power drops. At the same time the radiated power drops by over 100 kW. Perhaps by coincidence the NINJA puff occurs around 1.1 s when the radiated power starts to drop. Midplane pressure ~ 0.2mT initially in H-modes - cryopump on. PRF ~ ramp to 3 MW Ar puff on for 75 ms Elongation 1.74 |
| Apr 16 2008 12:29:47:010PM | 1080416013 | Bruce Lipschultz | shot 13: disrupts during currrent rise |
| Apr 16 2008 12:23:33:130PM | 1080416014 | Bruce Lipschultz | shot 14:
800 kA ZXU = 42.2 RXU ~ 58 cm for shot 12, now 55.8 cm nl04 ~ 0.8 after. H-mode transition at 2.5 MW Shorter enhanced L-mode confinement just before the H-mode (25 ms); this seems a good case. The QC mode frequency increases to ~ 200 kHz during the enhanced L-mode. H89 ~ 1.3, H98 ~ 1. Midplane pressure ~ 0.12mT initially rising slightly in H-modes - cryopump on. PRF ~ ramp to 3.0 MW Ar puff on for 75 ms Elongation quite high - 1.64 Next shot lower rxu by 3 cm again. |
| Apr 16 2008 01:35:53:467PM | 1080416015 | Bruce Lipschultz | shot 15:
800 kA ZXU = 39.5 RXU ~ 53 cm nl04 ~ 0.8. H-mode transition at 2.8 MW cryopump on. PRF ~ ramp to 3.0 MW Ar puff on for 75 ms Elongation - 1.6 |
| Apr 16 2008 01:33:00:870PM | 1080416016 | Bruce Lipschultz | shot 16:
800 kA ZXU = 39.5 RXU ~ 49 cm nl04 ~ 0.8. H-mode transition at 2.4 MW EDA-like with QC mode but also appeared to have ELM-like features. H89 ~ 1.6 cryopump on. PRF ~ ramp to 3.0 MW Ar puff on for 75 ms Elongation - 1.6 |
| Apr 16 2008 01:37:37:423PM | 1080416017 | Bruce Lipschultz | shot 17:
800 kA ZXU = 39.0 RXU ~ 49 cm nl04 ~ 0.8. H-mode transition at 2.4 MW cryopump on. PRF ~ ramp to 2.5 MW Ar puff on for 75 ms Elongation - 1.6 |
| Apr 16 2008 01:52:27:573PM | 1080416018 | Bruce Lipschultz | shot 18:
800 kA ZXU = 39.5 RXU ~ 56 cm nl04 ~ 0.7 during RF. H-mode transition at 2.5 MW cryopump on. PRF ~ ramp to 2.75 MW Ar puff on for 75 ms Elongation - 1.6 |
| Apr 16 2008 02:01:21:220PM | 1080416019 | Bruce Lipschultz | shot 19:
800 kA ZXU = 39.5 RXU ~ 56 cm nl04 ~ 1.0 during RF. No H-mode transition cryopump on. PRF ~ ramp to 2.75 MW Ar puff on for 75 ms Elongation - 1.6 |
| Apr 16 2008 02:02:44:567PM | 1080416020 | Bruce Lipschultz | shot 20:
800 kA ZXU = 39.5 RXU ~ 56 cm nl04 ~ 1.0 during RF. H-mode transition @ 2.6 MW cryopump on. PRF ~ ramp to 2.75 MW Ar puff on for 75 ms Elongation - 1.6 Next go back to 12 and reduce the power ramp to zoom in the region just before the transition to H-mode |
| Apr 16 2008 02:23:44:270PM | 1080416021 | Bruce Lipschultz | shot 21:
800 kA ZXU = 39.5 RXU ~ 56 cm nl04 ~ 1.0 during RF. H-mode transition @ 3 MW cryopump on. PRF ~ very slow ramp from 2.75 - 3 MW Ar puff on for 75 ms Elongation - 1.74 Next go back to higher current and see the effect |
| Apr 16 2008 02:54:09:113PM | 1080416022 | Bruce Lipschultz | shot 22:
1 MA but disruption before H-mode ZXU = 42 RXU ~ 56 cm nl04 ~ 1.0 during RF. H-mode transition did not occur cryopump on. PRF ~ very ramp Ar puff on for 75 ms Elongation - 1.74 Next lower x-point and move it in to get better coverage for Thomson and recover from leak and disruption |
| Apr 16 2008 03:01:18:690PM | 1080416023 | Bruce Lipschultz | shot 23:
fizzle |
| Apr 16 2008 03:52:40:817PM | 1080416024 | Bruce Lipschultz | shot 24:
1 MA, disruption, no H-mode RXU - 53.3 ZXU = 42.6 nl04 ~ 0.8 H89 increases to 1.2 then drops as radiated power increases |
| Apr 16 2008 03:54:17:193PM | 1080416025 | Bruce Lipschultz | shot 25:
1 MA, no H-mode RXU - 53.8 ZXU = 41. nl04 ~ 0.8 H89 ~ 1 with high Mo radiated power Back to shot 16 to try and reproduce that at higher power |
| Apr 16 2008 05:16:16:727PM | 1080416026 | Bruce Lipschultz | shot 26:
0.8 MA, short H-mode RXU - 49 ZXU = 39 nl04 ~ 0.8 H89 ~ 1 with high Mo radiated power (4 MW) Increase the density a bit and try again |
| Apr 16 2008 05:18:14:760PM | 1080416027 | Bruce Lipschultz | shot 27:
0.8 MA, short H-modes RXU - 49 ZXU = 39 nl04 ~ 0.8 H89 ~ 1 with high Mo radiated power (4 MW) turn over to higher current mp (Marmar) |
| Apr 16 2008 04:36:29:350PM | 1080416028 | Earl Marmar | try for 1.35 MA, 5.6 tesla, USN
start from 1080409030, but increase RXU also increase TF slightly very interesting shot no H-mode, but 200 kJ stored energy in L-mode, H98 ~ 1 |
| Apr 16 2008 04:36:51:023PM | 1080416030 | Earl Marmar | try for higher ICRF power (5 MW) |
| Apr 16 2008 05:53:46:240PM | 1080416031 | Bruce Lipschultz | shot 31:
0Disruption on current rise |
| Apr 16 2008 05:54:17:130PM | 1080416032 | Bruce Lipschultz | shot 32:
Disruption at 0.5 s |
| Apr 16 2008 05:56:23:380PM | 1080416033 | Bruce Lipschultz | shot 33:
Almost makes it - disruption at 1.35 s Stored energy reaches 225 kJ in H-mode, 200 kJ in L-mode |
| Apr 16 2008 05:57:08:023PM | 1080416034 | Bruce Lipschultz | shot 34:
Locked mode shot for Hirex Sr calibration |
| Physics Operator Comments | |||
| Apr 16 2008 07:41:12:367AM | Bill Rowan | Boronization as for 1080409 (see DISCHARGE_CLEAN entry)
He ECDC before run (see DISCHARGE_CLEAN entry) Load from 1071220002 Load Upper Null is on segment 03 and that segment is on Load segment 1 from 1080415030 | |
| Apr 16 2008 09:19:58:943AM | 1080416001 | Bill Rowan | 001. Plasma
USN as requested nl_04 = 1e+20 with demand set at 0.5e+20 Next shot PG1 increased from 21 ms to 56 ms Cryo |
| Apr 16 2008 09:27:55:590AM | 1080416002 | Bill Rowan | 002. Plasma
Next shot PG1 deceased from 56 ms to 55 ms reduced inner gap by 5 mm. clearin reduced by 5 mm and rcur by 2 mm |
| Apr 16 2008 09:36:37:563AM | 1080416003 | Bill Rowan | 003. Plasma
Next shot. Reduced innergap by 1 mm. |
| Apr 16 2008 09:37:40:707AM | 1080416003 | Bill Rowan | Reduced nl_04 demand to 0.4e+20
|
| Apr 16 2008 09:41:22:663AM | 1080416003 | Bill Rowan | Reduced outer gap by 4 mm by reducing rcur by 2 mm |
| Apr 16 2008 09:53:04:360AM | 1080416004 | Bill Rowan | 004. Plasma
Next shot. Reduced outer gap by approx 5 mm by increasing Rcur by 3 mm |
| Apr 16 2008 09:55:05:517AM | 1080416004 | Bill Rowan | Hirex sr gv opened |
| Apr 16 2008 09:58:12:317AM | 1080416004 | Bill Rowan | rxu increased by 1 cm -- skipping to point 4 of plan
|
| Apr 16 2008 10:12:42:060AM | 1080416005 | Bill Rowan | 005. Plasma
left gap 1.0 cm right gap 1.5 cm Next shot rxu decreased by 1 cm zxu increased by 1 cm |
| Apr 16 2008 10:45:15:697AM | 1080416007 | Bill Rowan | 007. Plasma
zxu increased by approximately 1.2 cm Next shot. enable b-side lower, pg1 argon pulse is 75 ms |
| Apr 16 2008 11:23:41:990AM | 1080416009 | Bill Rowan | 009. Plasma
Disruption at 1.17 s Next shot. zxu reduced by 0.5 cm zxl less negative by 5 mm |
| Apr 16 2008 11:22:52:570AM | 1080416010 | Bill Rowan | 010. Fizzle
Next shot reduce prefill by 1 ms |
| Apr 16 2008 11:42:13:817AM | 1080416011 | Bill Rowan | 011. Plasma
Next shot reduced prefill by 1 ms to 53 ms zcur is increased by 1 cm |
| Apr 16 2008 11:55:31:030AM | 1080416012 | Bill Rowan | 012. Plasma
Next shot. Reload segment 3 from 1080416005 into segment 3 Changed pg1 from 100 ms to 75 ms -- argon puff nl_04 increased from 0.4e+19 to 0.8e_19 rxu moved in by 2.5 cm |
| Apr 16 2008 12:07:23:400PM | 1080416013 | Bill Rowan | 013. Plasma. disruption
Next shot. Slow down the density rise by changing the nl_04 ramp rxu moved in by 0.5 cm for a total of 3 cm relative to shot 011 Reduce nl_04 demand to 0.7e+20 |
| Apr 16 2008 12:24:28:507PM | 1080416014 | Bill Rowan | 014. Plamsa
Next shot. rxu moved in by 3.0 cm from previous shot slow the density rise reduced the prefill by another 1 ms |
| Apr 16 2008 12:32:08:827PM | 1080416015 | Bill Rowan | 015. Plasma
Next shot. Increased the prefill by 1 ms rxu moved in by 3 cm from previous shot |
| Apr 16 2008 12:51:28:200PM | 1080416016 | Bill Rowan | 016. Plasma
Next shot increase the prefill by 1 ms rxl moved in by 3 cm from relative to previous shot |
| Apr 16 2008 01:08:20:993PM | 1080416017 | Bill Rowan | 017. Plasma
Next shot Load 1080416014 segment 3 into segment 3 reduce the nl_04 demand to 0.4e+20 reduce the density rise |
| Apr 16 2008 01:17:08:920PM | 1080416018 | Bill Rowan | 018, Plasma
Next shot. increase nl_04 to 1.0e+20 |
| Apr 16 2008 01:41:06:737PM | 1080416019 | Bill Rowan | 019. Plasma
Next shot. No pcs changes |
| Apr 16 2008 01:51:39:823PM | 1080416020 | Bill Rowan | 020. Plasma
Next shot. Reload segment 3 from 1080416012 |
| Apr 16 2008 02:09:48:870PM | 1080416021 | Bill Rowan | 021. Plasma
Next shot. Increase Ip to 1 MA |
| Apr 16 2008 02:13:41:183PM | 1080416021 | Bill Rowan | 021. Plasma
Next shot. Increase Ip to 1 MA Increase nl_04 to 0.65e+19 move zxu in by 2 cm |
| Apr 16 2008 02:25:40:880PM | 1080416022 | Bill Rowan | 022. Plasma
Disruption Looks like a moly injection Next shot. Lowered zxu by 0.5 cm Lowered zcur by 0.5 cm rxu moved in by 2 cm |
| Apr 16 2008 03:02:22:667PM | 1080416023 | Bill Rowan | 023. Fizzle
Long pause before this shot due to the leak: leak recovery Next shot. Reduce the fill by 1 ms |
| Apr 16 2008 03:15:45:293PM | 1080416024 | Bill Rowan | 024. Plasma
Disruption at 1.47 s Next shot. Lower zcur by 1 cm |
| Apr 16 2008 03:35:45:960PM | 1080416025 | Bill Rowan | 025. Plasma
Next shot Reload segment 3 of shot 1080416016 |
| Apr 16 2008 03:50:15:643PM | 1080416026 | Bill Rowan | 026. Plasma
Next shot. Increased the prefill by 1 ms nl_04 target increased to 0.8e+20 |
| Apr 16 2008 04:09:56:643PM | 1080416027 | Bill Rowan | 027. Plasma
Next shot. New start load 1080409030 Increased BT to 5.6T in segment 2 Turned off segment 3 ZXU reduced by 5 mm TF rampdown starts at 1.2 s increased rxu by 1 cm to 0 |
| Apr 16 2008 04:29:11:110PM | 1080416028 | Bill Rowan | 028. Plasma
BT=5.6T rxu=55.9 zxu=0.73 q95=2.9 doutu=0.51 Next shot. No changes |
| Apr 16 2008 04:35:52:523PM | 1080416029 | Bill Rowan | 029. Plasma
Next shot No pcs changes |
| Apr 16 2008 05:30:07:707PM | 1080416032 | Bill Rowan | 032. Plasma
disruption at 0.5 s Next shot. no pcs changes |
| Apr 16 2008 05:37:36:820PM | 1080416033 | Bill Rowan | 033. Plasma
Disruption during ramp down |
| Apr 16 2008 05:39:34:837PM | 1080416033 | Bill Rowan | Next shot.
RXU moved in by 1 cm |
| Apr 16 2008 05:42:19:997PM | 1080416033 | Bill Rowan | Zcurr moved down by 1 cm |
| Apr 16 2008 05:58:39:227PM | 1080416034 | Bill Rowan | 034. Fizzle
Next shot. Reload 1080215001 increase argon puff to 250 ms changed prefill to 18 ms |
| Apr 16 2008 06:11:19:830PM | 1080416035 | Bill Rowan | 035.
Plasma Disruption at 0.9 s As planned, it locked Last shot |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:59:19:113AM | Plasma | Ok | |
| 2 | 09:14:20:267AM | Plasma | Ok | |
| 3 | 09:30:34:653AM | Plasma | Ok | |
| 4 | 09:46:33:073AM | Plasma | Ok | |
| 5 | 10:04:45:667AM | Plasma | Ok | |
| 6 | 10:19:21:910AM | Plasma | Ok | |
| 7 | 10:34:59:077AM | Plasma | Ok | |
| 8 | 10:48:23:853AM | Plasma | Ok | |
| 9 | 11:02:07:380AM | Plasma | Ok | |
| 10 | 11:15:05:017AM | Plasma | Ok | |
| 11 | 11:28:26:493AM | Plasma | Ok | |
| 12 | 11:42:55:100AM | Plasma | Ok | |
| 13 | 11:56:31:733AM | Plasma | Ok | |
| 14 | 12:09:11:713PM | Plasma | Ok | |
| 15 | 12:22:03:457PM | Plasma | Ok | |
| 16 | 12:39:22:517PM | Plasma | Ok | |
| 17 | 12:56:10:407PM | Plasma | Ok | |
| 18 | 01:08:57:477PM | Plasma | Ok | |
| 19 | 01:31:58:963PM | Plasma | Ok | |
| 20 | 01:46:34:210PM | Plasma | Ok | |
| 21 | 01:59:52:203PM | Plasma | Ok | |
| 22 | 02:14:37:857PM | Plasma | Ok | |
| 23 | 02:53:48:870PM | Plasma | Ok | |
| 24 | 03:07:04:513PM | Plasma | Ok | |
| 25 | 03:27:44:063PM | Plasma | Ok | |
| 26 | 03:41:18:543PM | Plasma | Ok | |
| 27 | 03:55:07:040PM | Plasma | Ok | |
| 28 | 04:12:21:427PM | Plasma | Ok | |
| 29 | 04:26:46:203PM | Plasma | Ok | |
| 30 | 04:43:18:810PM | Plasma | Ok | |
| 31 | 05:04:30:543PM | Plasma | Ok | |
| 32 | 05:20:14:493PM | Plasma | Ok | |
| 33 | 05:32:58:037PM | Plasma | Ok | |
| 34 | 05:49:19:783PM | Plasma | Ok | |
| 35 | 06:06:47:983PM | Plasma | Ok | |
| System Availability | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Apr 16 2008 08:59:11:240AM | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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