| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Martin Greenwald |
| Physics operator(s): | Bill Rowan |
| Engineering operator(s): | Bill Parkin,Bill Byford |
| Engineering Operator Run Comment |
| MP253 Low Power Ohmic H Mode EDA SL:Greenwald, PO: Rowan, EO Byford/Park |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:24:947PM |
| Author: To Be Determined |
| Run Summary for 1000829 MP 253 Very Low Power EDA Session Leader - M. Greenwald Phys Op - W. Rowan Background and Plan: With its good energy confinement, moderate particle confinement and lack of large ELMs, the EDA H-mode could be a highly favorable regime for a tokamak reactor - if we can understand the underlying physics sufficiently to extrapolate into new regimes. The key to understanding EDA seems to be in the quasi-coherent fluctuations which have been observered by the reflectometer, PCI, and probes. These fluctuations seem always to accompany EDA and have been shown to drive significant particle flux. We want to understand the relationship between the mode and the local pedestal profiles allowing us to evaluate the micro and macro-stability. The first step will be to localize the mode relative to the density and temperature pedestals. We will try to correlate both mode amplitude and convected flux with the local gradients. Because the range of the scanning probe is limited by incident heat flux, we attempt to run EDA H-modes at the lowest possible powers. Following the recipe that was successful previously, we begin with OH h-modes discharges at relatively low q and then scan Bt and Ip to raise q allowing access to the EDA regime. The new wrinkle here is the new probe head on ASP. This restores the 6 mm spacing. We will also try some puffing with FSP to look for flows during the H-mode. The loose ground that cause problems with Ly_alpha data in the previous run should also be fixed. ============================== Results: A good day. Ohmic H-modes were easy to get. The EDAs were more clear than some previous oh runs. The Q-C fluctuations were clearly seen on the pci, reflectometer, electrostatic probes. We should have some good data for analysis of fluctuation driven flux. It looked like the FSP had some shorting or other technical problems on some shots - so care will have to be taken in choosing the data for the analysis. We should also have decent Ly_alpha data to look at Deff, etc. Some progress was made on localizing the mode. As before, it is clearly seen in the steep density gradient region Images of carbon plumes from the gas puffer in FSP showed a flow reversal just outside the region where the QC mode began. This might be interpreted to localize the mode relative to the Er well. On several shots 26,27,28,29, it appeared that the north floating probe of ASP traversed the entire mode. If so, the structure would be not much more than 2mm in width. We saw consistent density peaking in the ohmic h-mode phase. ================================ Shots suitable for further analysis include: 1000928002 1000928004 1000928009 start of scanning probe work 1000928010 1000928011 1000928012 1000928013 1000928014 1000928015 1000928016 1000928017 1000928021 1000928022 1000928023 1000928026 1000928027 1000928028 1000928029 |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:12:147PM |
| Author: To Be Determined |
| Physop summary for 1000928 Engineering setup for Thursday, Sept 28, 2000 --------------------------------------- MP#253 Low-Power Ohmic H-Mode EDA SL: Greenwald PO: Rowan EO: Byford/Parkin Overnight ECDC in D2, stopping 1-2 hours before run. Run begins 9:00 and ends at 17:00 Power System Setup: Same as on 1000622022 Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED fill B-side upper with 35 psi of D2 Hybrid DISABLED, available ECDC fill C-side with 30 psi of D2 Hybrid enabled leave J-bottom as is Hybrid DISABLED The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV DNB gate valve will be disabled. Run Plan ------------------- Continuation of MP 253 Low-Power Ohmic H-Mode EDA The main new thing will be the wider spacing on the a-side scanning probe. The aim is to get more data on the k spectrum and particle transport driven by the quasi-coherent mode. We also hope to get better data on the ionization source (Ly_alpha) than last time. We're interested in getting the best data we can on edge profiles and fluctuations. Run Summary -------------------- The first shot was a fizzle. BR_0 was negative with respect to the last shot yesterday (9/27/00). In retrospect, I should have replaced segment 1 of the reference shot with segment 1 from a good shot on 9/27 before starting the run. I did that after the first shot and the second shot was good. Shots 005-008 were duds. Fiddled with the gas after each of the first 3. Then increased sparker voltage and ran ECDC for fifteen minutes after shot 008. Also, stopped the RF conditioning shots. Shot 009 was good. I have no idea which of these -- if any -- is is important. If there are duds in the near future, it might be worthwhile to try to sort this out if the SL is willing to sacrifice a significant number of shots. Shots 019 and 020 were fizzles. Late breakdown. I tried ECDC for fifteen minutes after the first of these. Then reduced the gas after the second. Shot 021 was successful. The remainder of the shots were good. Score card. Plasmas 22 Fizzles 3 Duds 4 Total 29 Details of the run ----------------------- Started pcs and loaded shot 1000622022 Load at 28-Sep-2000 08:08:50.00 Open tree SCRATCH_DISK:[ROWAN] -1 Open tree done Did a coldstart. Last few lines: rtnode -- data loaded, A matrix responds rtnode -- data loaded, M matrix responds rtnode -- data loaded, PID matrix responds RT_NODE Done 28-SEP-2000 08:12:50.87 doing TCL command TYPE *************** END COLD START ****************** *************** END COLDSTART ****************** 001. Fizzle BR_0 was negative with respect to the last shot yesterday (1000927013) and with respect to the reference shot (1000622022) Imported segment 01 from shot 1000927013. Pressure and BZ_0 look okay to me. 002. Plasma. 003. Plasma. Disruption at 0.99s. Not sure about this disruption. Small indication on 2pi bolometer. Also ramping the field. With regard to this disruption, will try again and see if it happens at the same time. Next shot: Change TF rampup from 1.3 s to 1.15 s to avoid disruption that we expect to develop at late times based on the reference shots. 004. Plasma. Disruption on the current rampdown. Next shot: Changes in the magnetic field after 1 s to move the ramp 005. Dud. Gas is low. It started low this morning and has not come up shot by shot as I thought that it might. Next shot. add 2 ms of gas to the prefill 006. Dud. Prefill pressure dropped. Next shot. Added 2 ms of gas to the prefill. Expecting 24 ms prefill Verified load/clean Load at 28-Sep-2000 10:32:45.00 Open tree SCRATCH_DISK:[ROWAN] -1 Open tree done 007. Dud. Prefill pressure increased to 0.05 mT to 0.06 mT Next shot. Added 1 ms of gas to the prefill. Verified load/clean Load at 28-Sep-2000 10:48:58.00 Open tree SCRATCH_DISK:[ROWAN] -1 Open tree done 008. Dud. For next shot: Returning to what worked before. Increased sparker voltage to 800 Starting ECDC for 15 minutes between shots. 009. Plasma. Next shot: Small change in field ramp after 1 s. Verified load: Load at 28-Sep-2000 11:33:00.00 Open tree SCRATCH_DISK:[ROWAN] -1 Open tree done 010. Plasma. Next shot. Moved ZXL lower by approximately 7 mm after 1 s 011. Plasma On this shot zxl was ramped from 1 s to 1.3 s for probes. Next shot. Increased the ramp so that zxl is lower by 3 mm at 1.3 s 012. Plasma. Next shot. No changes. 013. Plasma. Disruption just before 1.5 s. Next shot. No changes. 014. Plasma. Disruption just after 1.5 s. This and the previous disruption appear to be related to an impurity injection Next shot. No changes. 015. Plasma. Disruption just after 1.6 s IP ramp down starts at 1.5 s Next shot. No change in plasma setup. Plume probe in operation. 016. Plasma. Next shot. No changes. 017. Plasma. Disruption at 1.26 s. Next shot. No changes 018. Plasma. Disruption at 1.45 s Next shot. No changes. 019. Fizzle. ECDC for 15 minutes before the next shot. Next shot. No changes in pcs. Plume probe off. 020. Fizzle. Late breakdown. Next shot. Reduced prefill by 2 ms. 021. Plasma. Next shot. No changes in pcs. Burping probe back on. 022. Plasma. Next shot. No changes in pcs 023. Plasma. Next shot. No changes in pcs 024. Plasma. Disruption at 1.4 s. Next shot. Adjusted zxl for probe at 1.4 s 025. Plasma. Disrupted at 1.2 s. Next shot. No changes in pcs. 026. Plasma. Disrupted at 1.5 s. Next shot. No changes in pcs. 027. Plasma. Next shot. No changes in pcs. 028. Plasma. Next shot. No changes in pcs. 029. Plasma. Last shot. |
| Session Leader Comments | |||
| Sep 28 2000 08:51:46:450AM | Martin Greenwald | MP 253 - Low power Ohmic EDA With its good energy confinement, moderate particle confinement and lack of large ELMs, the EDA H-mode could be a highly favorable regime for a tokamak reactor - if we can understand the underlying physics sufficiently to extrapolate into new regimes. The key to understanding EDA seems to be in the quasi-coherent fluctuations which have been observered by the reflectometer, PCI, and probes. These fluctuations seem always to accompany EDA and have been shown to drive significant particle flux. We want to understand the relationship between the mode and the local pedestal profiles allowing us to evaluate the micro and macro-stability. The first step will be to localize the mode relative to the density and temperature pedestals. We will try to correlate both mode amplitude and convected flux with the local gradients. We want to run ohmic EDA H-modes at the lowest possible power levels to allow the deepest penetration of the scanning probe. The goals are to: 1 Verify the extent and radial structure of the quasi-coherent fluctuation and its relation to density and temperature profiles 2 Compare particle (and energy) flux convected by the fluctuation with the local particle and power balance. 3 Improve on k$_{\theta}$ resolution from previous campaign. The new wrinkle here is the new probe head on ASP. This restores the 6 mm spacing. We will also try some puffing with FSP to look for flows during H-mode. | |
| Sep 28 2000 09:33:59:700AM | 1000928002 | Martin Greenwald | Ohmic H-mode Good confinement no fluctuation data yet |
| Sep 28 2000 09:38:58:950AM | 1000928003 | Martin Greenwald | Disrupts at about 1. sec brief h-mode |
| Sep 28 2000 10:03:18:547AM | 1000928004 | Martin Greenwald | Good ohmic h-mode signs of weak eda startin at about 1.18 sec |
| Sep 28 2000 10:14:59:983AM | 1000928005 | Martin Greenwald | dud |
| Sep 28 2000 10:28:43:233AM | 1000928006 | Martin Greenwald | dud |
| Sep 28 2000 11:33:17:733AM | 1000928009 | Martin Greenwald | Good shot after series of duds no h-mode |
| Sep 28 2000 11:58:57:420AM | 1000928010 | Martin Greenwald | slightly deeper sweep in Bt Good H-mode at about 1.sec QC fluctuations seen beginning about 1.05 sharp change in slope of Wmhd and Prad at about 1.1 after 1.1 dW/dt and dPrad/dt = 0 => strong EDA strong density peaking seen too |
| Sep 28 2000 12:27:51:653PM | 1000928011 | Martin Greenwald | Good ohmic H-mode QC fluctuations seen with PCI and Reflt just beginning to be seen with probes |
| Sep 28 2000 12:26:42:357PM | 1000928012 | Martin Greenwald | Another good Ohmic H-mode EDA fluctuations seen on all diagnostics |
| Sep 28 2000 12:36:28:123PM | 1000928013 | Martin Greenwald | Good shot though disrupts at 1.45 sec maybe an injection early in the h-mode phase |
| Sep 28 2000 01:02:10:577PM | 1000928014 | Martin Greenwald | Lasts longer injection at 1.3 sec ELMfree afterwards Good data from fsp |
| Sep 28 2000 01:15:45:933PM | 1000928016 | Martin Greenwald | Good shot both probe scans during EDA differences in phase seen between scans and between asp and fsp |
| Sep 28 2000 01:28:59:373PM | 1000928016 | Martin Greenwald | Good shot clear EF/EDA transition at 1.18 sec - early shots were more gradual |
| Sep 28 2000 01:44:52:107PM | 1000928017 | Martin Greenwald | Disrupts early, 1.26 sec |
| Sep 28 2000 01:53:59:873PM | 1000928018 | Martin Greenwald | probe in a bit too deep - injecting impurities never develops good eda |
| Sep 28 2000 02:25:59:623PM | 1000928019 | Martin Greenwald | fizzle |
| Sep 28 2000 02:26:10:107PM | 1000928020 | Martin Greenwald | fizzle |
| Sep 28 2000 02:52:13:217PM | 1000928021 | Martin Greenwald | Good shot nice signals on the scanning probes |
| Sep 28 2000 03:42:43:780PM | 1000928022 | Martin Greenwald | Good shot |
| Sep 28 2000 03:16:47:437PM | 1000928023 | Martin Greenwald | Good H-mode Disrupts early only one probe scan |
| Sep 28 2000 03:35:45:233PM | 1000928024 | Martin Greenwald | Disrupts early, but first scan good just barely into eda |
| Sep 28 2000 03:53:16:593PM | 1000928025 | Martin Greenwald | Disrupts early again |
| Sep 28 2000 04:21:14:857PM | 1000928026 | Martin Greenwald | Better, Good data with both plunges ASP may go in too far - mode disappears before deepest insertion FSP sees mode throughout |
| Sep 28 2000 05:21:09:763PM | 1000928028 | Martin Greenwald | Good Shot |
| Sep 28 2000 05:20:37:183PM | 1000928029 | Martin Greenwald | Good shot |
| Physics Operator Comments | |||
| Sep 28 2000 07:51:03:513AM | Bill Rowan | Engineering Setup for Thursday, Sept 28 MP#253 Low-Power Ohmic H-Mode EDA SL: Greenwald PO: Rowan Engineering setup: ------------------- Overnight ECDC in D2, stopping 1-2 hours before run. Run begins 9:00 and ends at 17:00 Power System Setup: Same as on 1000622022 Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED fill B-side upper with 35 psi of D2 Hybrid DISABLED, available ECDC fill C-side with 30 psi of D2 Hybrid enabled leave J-bottom as is Hybrid DISABLED The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV DNB gate valve will be disabled. Run Plan ------------------- Continuation of MP 253 Low-Power Ohmic H-Mode EDA The main new thing will be the wider spacing on the a-side scanning probe. The aim is to get more data on the k spectrum and particle transport driven by the quasi-coherent mode. We also hope to get better data on the ionization source (Ly_alpha) than last time. We're interested in getting the best data we can on edge profiles and fluctuations. | |
| Sep 28 2000 08:17:11:717AM | Bill Rowan | Started pcs and loaded shot 1000622022 Load at 28-Sep-2000 08:08:50.00 Open tree SCRATCH_DISK:[ROWAN] -1 Open tree done Did a coldstart. Last few lines: rtnode -- data loaded, A matrix responds rtnode -- data loaded, M matrix responds rtnode -- data loaded, PID matrix responds RT_NODE Done 28-SEP-2000 08:12:50.87 doing TCL command TYPE *************** END COLD START ****************** *************** END COLDSTART ****************** | |
| Sep 28 2000 09:16:03:437AM | 1000928001 | Bill Rowan | 001. Fizzle BR_0 was negative with respect to the last shot yesterday (1000927013) and with respect to the reference shot (1000622022) Imported segment 01 from shot 1000927013. Pressure and BZ_0 look okay to me. |
| Sep 28 2000 09:37:26:623AM | 1000928003 | Bill Rowan | 002. Plasma. Next shot: no changes |
| Sep 28 2000 09:47:42:513AM | 1000928003 | Bill Rowan | 003. Plasma. Disruption at 0.99s. Not sure about this disruption. Small indication on 2pi bolometer. Also ramping the field. With regard to this disruption, will try again and see if it happens at the same time. Next shot: Change TF rampup from 1.3 s to 1.15 s to avoid disruption that we expect to develop at late times based on the reference shots. |
| Sep 28 2000 09:58:33:843AM | 1000928004 | Bill Rowan | 004. Plasma. Disruption on the current rampdown. |
| Sep 28 2000 10:13:20:543AM | 1000928004 | Bill Rowan | 004. Plasma. Disruption on the current rampdown. Next shot: Changes in the magnetic field after 1 s to move the ramp |
| Sep 28 2000 10:22:50:280AM | 1000928005 | Bill Rowan | 005. Dud. Gas is low. It started low this morning and has not come up shot by shot as I thought that it might. Next shot. add 2 ms of gas to the prefill |
| Sep 28 2000 10:37:25:280AM | 1000928006 | Bill Rowan | l006. Dud. Prefill pressure dropped. Next shot. Added 2 ms of gas to the prefill. Expecting 24 ms prefill Verified load/clean Load at 28-Sep-2000 10:32:45.00 Open tree SCRATCH_DISK:[ROWAN] -1 Open tree done |
| Sep 28 2000 10:50:16:373AM | 1000928007 | Bill Rowan | 007. Dud. Prefill pressure increased to 0.05 mT to 0.06 mT Next shot. Added 1 ms of gas to the prefill. Verified load/clean Load at 28-Sep-2000 10:48:58.00 Open tree SCRATCH_DISK:[ROWAN] -1 Open tree done |
| Sep 28 2000 11:09:17:920AM | 1000928008 | Bill Rowan | 008. Dud. Returning to what worked before. Increased sparker voltage to 800 Starting ECDC for 15 minutes between shots. |
| Sep 28 2000 11:37:24:373AM | 1000928009 | Bill Rowan | 009. Plasma. Next shot: Small change in field ramp after 1 s. Verified load: Load at 28-Sep-2000 11:33:00.00 Open tree SCRATCH_DISK:[ROWAN] -1 Open tree done |
| Sep 28 2000 12:01:57:107PM | 1000928010 | Bill Rowan | Next shot. Moved ZXL lower by approximately 7 mm after 1 s |
| Sep 28 2000 12:13:05:060PM | 1000928011 | Bill Rowan | 011. Plasma On this shot zxl was ramped from 1 s to 1.3 s for probes. Next shot. Increased the ramp so that zxl is lower by 3 mm at 1.3 s |
| Sep 28 2000 12:33:01:293PM | 1000928012 | Bill Rowan | 012. Plasma. Next shot. No changes. |
| Sep 28 2000 12:44:18:873PM | 1000928013 | Bill Rowan | 013. Plasma. Disruption just before 1.5 s. Next shot. No changes. |
| Sep 28 2000 12:58:19:310PM | 1000928014 | Bill Rowan | 014. Plasma. Disruption just after 1.5 s. This and the previous disruption appear to be related to an impurity injection Next shot. No changes. |
| Sep 28 2000 01:13:14:937PM | 1000928015 | Bill Rowan | 015. Plasma. Disruption just after 1.6 s IP ramp down starts at 1.5 s Next shot. No change in plasma setup. |
| Sep 28 2000 01:13:55:230PM | 1000928015 | Bill Rowan | Plume probe in operation |
| Sep 28 2000 01:28:14:153PM | 1000928016 | Bill Rowan | 016. Plasma. Next shot. No changes. |
| Sep 28 2000 01:39:57:217PM | 1000928017 | Bill Rowan | 017. Plasma. Disruption at 1.26 s. Next shot. No changes |
| Sep 28 2000 01:54:29:373PM | 1000928018 | Bill Rowan | 018. Plasma. Disruption at 1.45 s Next shot. No changes. |
| Sep 28 2000 02:11:33:560PM | 1000928019 | Bill Rowan | 019. Fizzle. ECDC for 15 minutes before the next shot. Next shot. No changes in pcs. Plume probe off. |
| Sep 28 2000 02:34:33:217PM | 1000928020 | Bill Rowan | 020. Fizzle. Late breakdown. Next shot. Reduced prefill by 2 ms. |
| Sep 28 2000 02:45:39:857PM | 1000928021 | Bill Rowan | 021. Plasma. Next shot. No changes in pcs. Burping probe back on. |
| Sep 28 2000 03:04:41:513PM | 1000928022 | Bill Rowan | 022. Plasma. Next shot. No changes in pcs |
| Sep 28 2000 03:17:04:060PM | 1000928023 | Bill Rowan | 023. Plasma. Next shot. No changes in pcs |
| Sep 28 2000 03:39:19:200PM | 1000928024 | Bill Rowan | 024. Plasma. Disruption at 1.4 s. Next shot. Adjusted zxl for probe at 1.4 s |
| Sep 28 2000 03:55:24:873PM | 1000928025 | Bill Rowan | 025. Plasma. Disrupted at 1.2 s. Next shot. No changes in pcs. |
| Sep 28 2000 04:12:04:780PM | 1000928026 | Bill Rowan | 026. Plasma. Disrupted at 1.5 s. Next shot. No changes in pcs. |
| Sep 28 2000 04:29:33:903PM | 1000928027 | Bill Rowan | 027. Plasma. Next shot. No changes in pcs. |
| Sep 28 2000 04:58:31:000PM | 1000928028 | Bill Rowan | 028. Plasma. Next shot. No changes in pcs. |
| Sep 28 2000 05:05:25:967PM | 1000928028 | Bill Rowan | 028. Plasma. Next shot. No changes in pcs. |
| Sep 28 2000 05:05:53:530PM | 1000928029 | Bill Rowan | 029. Plasma. Last shot. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:03:39:640AM | Plasma | Ok | |
| 2 | 09:20:56:030AM | Plasma | Ok | |
| 3 | 09:34:19:280AM | Plasma | Ok | |
| 4 | 09:47:51:107AM | Plasma | Ok | |
| 5 | 10:10:54:577AM | Plasma | Ok | |
| 6 | 10:25:52:547AM | Plasma | Ok | |
| 7 | 10:40:53:750AM | Plasma | Ok | |
| 8 | 10:53:56:810AM | Plasma | Ok | |
| 9 | 11:25:27:547AM | Plasma | Ok | |
| 10 | 11:45:55:437AM | Plasma | Ok | |
| 11 | 12:03:57:297PM | Plasma | Ok | |
| 12 | 12:17:00:687PM | Plasma | Ok | |
| 13 | 12:30:41:637PM | Plasma | Ok | |
| 14 | 12:45:30:263PM | Plasma | Ok | |
| 15 | 01:00:02:640PM | Plasma | Ok | |
| 16 | 01:14:59:903PM | Plasma | Ok | |
| 17 | 01:29:49:623PM | Plasma | Ok | |
| 18 | 01:43:26:030PM | Plasma | Ok | |
| 19 | 01:56:41:607PM | Plasma | Ok | |
| 20 | 02:24:13:450PM | Plasma | Ok | |
| 21 | 02:37:19:153PM | Plasma | Ok | |
| 22 | 02:50:45:683PM | Plasma | Ok | |
| 23 | 03:05:28:030PM | Plasma | Ok | |
| 24 | 03:23:08:827PM | Plasma | Ok | |
| 25 | 03:42:08:200PM | Plasma | Ok | |
| 26 | 03:57:19:250PM | Plasma | Ok | |
| 27 | 04:15:22:433PM | Plasma | Ok | |
| 28 | 04:47:47:687PM | Plasma | Ok | |
| 29 | 05:01:32:390PM | Plasma | Ok | |