| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Jim Terry |
| Physics operator(s): | Ian Hutchinson |
| Engineering operator(s): | Bill Cochran,Sam Pierson,Ed Fitzgerald |
| Engineering Operator Run Comment |
| automatically entered by signon - please replace with real comment |
| Session Leader Plans |
| Entered: Jul 24 2007 10:41:18:320AM |
| Author: Jim Terry |
| This is another attempt at performing the work
started during run 1070719 - "Study of the Structure, Dynamics, and Energetics of ELMs" - MP #511. It is also a continuation of MPs #426 and #458. It will utilize the following new capabilities that should positively impact our investigation of ELMs: Cyropumping, A new array of probes mounted in the floor of the upper divertor, A new view and fast camera for Gas-Puff-Imaging just outboard of the typical location of the LSN X-pt., Additional fast magnetic sensors different toroidal locations, An inward shift of the radial location of the poloidal array of fast-diode views. In order to utilize the cryopump and the upper divertor probe array we will run USN plasmas with REVERSED field and current. In a well-boronized machine, we will begin by trying to produce Type 1 ELMs in in a less extreme version of the non-standard JFT-2M shape in the USN configuration. Instead of the JFT2M's upper triangularity ~0.75, we will begin with upper triangularity ~0.65. And instead of the JFT2M shape's lower triangularity of ~0.15, we will start with a somewhat higher value of ~0.25. Then, depending upon what is allowed by the power supplies and depending on whether or not we are producing ELMs, we will progress in steps closer toward the JFT2M shape, observing any change in the ELM/pedestal behavior. We will also attempt to produce Type I ELMs using the reversed field, USN, cyropumped Ohmic H-modes (e.g. 1070720022) as target plasmas for ICRF heating. This target plasma exhibited Type III ELMs. We will turn on the ICRF after the Ohmic H-mode is established. If we produce ELMs using either of these two approaches, we will increase the ICRF power from 2 MW to the highest available power, in order to examine the ELM frequency vs RF power. After producing discharges with ELMs, we will study the ELM structure/dynamics - by examining the X-pt-GPI images (150,000 frames/s with a 1 microsec integration time) and what is seen on the poloidal array of fast-diode views; - by using the ASP in dwell mode (R=90.0, 91.0, and 92.0 cm mapped to midplane) to examine the timing (1 Mhz digitization rate) of filaments reaching the probe relative to those for the other fast ELM diagnostics; - by using the antenna loading measurements (250 kHz) to examine the timing of filaments reaching the antennas relative to those for the other fast diagnostics; - by continuing investigation of hi-freq magnetic oscillation at filament ejection, We will also study the ELM energetics - by performing power scan, concentrating on ELMs at high power (>3MW if possible), - by employing BES/DNB measurements for fast ne profiles during ELM crash, - by employing upper fixed probes in ion-saturation mode to make ELM timing and energetics measurements, - by examining the non-thermal electron generation at ELM crash using the ECE , - by examining soft x-ray signals at highest digitization frequency (100 kHz), - by employing ASP in dwell mode in the far-SOL (~90 cm) to yield an additional Te measurement in SOL (in addition to the ECE and TS measurements), - and by making ELMs at two significantly different values for the outer gap. Diagnostics: Core and edge TS*, TCI*, ECE* (100kHz dig rate with outermost GPC channel in the pedestal and outermost GPC2 channels outside the sepx), midplane GPI*, X-pt GPI*, Soft x-ray arrays (digitized at 100 kHz from 0.8 to 0.9 s)*, fast magnetics (digitized at 10 MHz from 0.7 to 1.2 s)*, ASP in dwell mode at R=90.0 cm, 91.0 cm, and 92.0 cm (mapped to midplane)*, upper divertor probes (digitized at 1 MHz from 0.7 to 1.2 s)*, IR camera* BES (viewing the pedestal with a 1 MHz digitization rate)* PCI (digitized at 10 MHz from 0.7 to 1.2 s), reflectometry, DALSA VB profiles *ed diagnostics are crucial Run Plan: 1.With well-boronized walls, start with 1070719006 with reduced demands on the shape, i.e. dupper=0.65, dlower~0.25 - observe discrete ELMs (3 good shots - with fast ELM diagnostics working). 2.Try to approach the JFT2M shape gradually as is allowed by power supply capabilities - observe pedestal changes and whether ELMs are produced. (4 shots - with fast ELM diagnostics working). 3.If Type I ELMs are produced, repeat with increased ICRF power - up to max available (2 good shots). If Type I ELMs are not produced, then use shot 1070720022 (a cryopumped, Ohmic H-mode plasma) as the target for ICRF heating (2MW) and observe whether or not Type I ELMs are produced. If so, then use this discharge for the following steps in the ELM study. 4.Repeat with cyropumping at optimum RF power level (2 good shots) 5.At optimum RF power and cyropumping (if that has improved the reproducibility of the ELMs) change the target density to NL_04=3e19 m-2 and NL_04=8e19 m-2 (2 shots per density - 4 shots total) 6.At optimum RF power, cyropumping, and target density, change the outer gap to 3.0 cm and 1.0 cm. (2 shots per gap - 4 shots total) 7.Repeat at optimum RF power, cyropumping, and target density with fast ELM diagnostics working (fast-magnetics, two GPI views, upper divertor probes, ASP in dwell mode, BES/NBI, PCI, X-ray arrays, antenna loading detection) (7 shots) 8.Repeat at optimum RF power, cyropumping, and target density with 6 of the fast-diode views switched to include the inboard radial array (2 shots) |
| Physics Operators Plans |
| Entered: Jul 23 2007 03:30:01:620PM |
| Author: Ian Hutchinson |
| MP#458 (also submitted MP, covering Idea #907) "ELM structure, dynamics, and
energetics" Pre-Run Boronization request: 5-hr boronization with vertical field (Bv/Bt~0.1), at higher-than-typical pressure - 55 mTorr foreline pressure, with sweep from a min R_ec_resonance = 70 cm to a max R_ec_resonance = 80 cm, This minimum on the sweep is set by the desire to keep the upper divertor probes clean. This run will be reversed field, upper null, with cryopump. Two hours ECDC in D2, finishing by 8AM. Pressure 2e-4 Torr, sweep rmin/rdwell/rmax=44/45/103 acoils configured (-Dtop +Dbot +Jtop -Jbot) enabled Gas setup: Fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid ENABLED (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill NINJA to 10 psi D2 and ENABLE. Enable the following gate valves and shutters, assuming no problems: ECE, VUV, DNB, Z-bolo shutters Torvac setup: Gate valves open after the shot ICRF: Transmitters 1,2,3,4 in RUN-ON by 8:30 Start with 2MW (D+E) from 0.7 to 1.2sec as on 1060503022 We will probably want to add J later in the day. LH: NO LH for this run DNB: yes (with MSE polarizer removed, so that BES signal will be increased) Cryopump: ready for operation after first successful plasma. load shot 1070719006, but with reduced demands on triangularity, i.e. dupper=0.65, dlower~0.25 Bt=+5.4 T Ip=+0.9 MA NL04=0.5e20 m-2 upper triangularity=0.65 lower triangularity=0.25 outer gap= 2.0 cm (this is different than 1060503022) inner gap=2.0 cm We'll be increasing the upper triangularity, decreasing the lower triangularity, and varying outer gap and density, and using the cryopump. At some point we will want to good to maximum available ICRF power. If this approach does not produce good, Type I ELMs, we will load shot 1070720022 (a cryopumped, ELMing, Ohmic H-mode plasma) as the target for ICRF heating (2MW) and observe whether or not Type I ELMs are produced. |
| Session Leader Summaries |
| Entered: Oct 16 2007 09:59:00:590AM |
| Author: Jim Terry |
| This was a successful run.
We succeeded in making the JFT2M shape in USN with reversed fields and current. We succeeded in making large discrete ELMs in this shape. Eventually, however, we lost the ELMs in the JFT2M shape presumably because the boronization was waring off. (We observed that the radiated power increased much faster for the non-ELMing shots (which were also shots later in the day) than it had for the ELMing H-mode shots earlier in the day.) We produced ELMS at outer gaps ranging from 2.2 cm (1070724013) to 1.2 cm (1070724011). We observed ELMs first the 1st time with the following diagnotics: upper divertor probes - use /home/labombard/scopes/fmp_fast_digitizer_data.dat ASP in dwell mode - use /home/labombard/scopes/asp_processed_vs_time.dat soft x-ray edge array - use /home/granetz/scopes/xtomo_array_4.dat (Chord 01 is innermost. The 38 chords cover about 38 mm in the pedestal region. Filter is 10 micrometers of beryllium.) Use also /home/granetz/scopes/xtomo_array_3.dat to look at the core and edge channels, sinec many ELMs are triggered by sawtooth crashes. BES (with beam both on and off) - use /home/terry/scopes/bes_scope.dat reflectometer - use Arturo's widget-based avalysis /home/dominguez/reflectometry/mywidget/plotwidget.pro We also observed ELMs with diagnostics that have been used previously for this purpose: GPI fast-diode arrays fast-magnetics PCI ECE We were unsuccessful in producing ELMs using the cyropumped Ohmic H-mode target plasmas. See shot 024. We were successful in making an H-mode in the JFT2M shape in the UNFAVORABLE gradB drift direction and we observed ELMs in this case. Pedestal Te was lower in this scenario (500 eV as opposed to 800-1000eV) Following is a list of the useful shots: Shot ELMs cryo outer gap tri_upper tri_lower target ne (times) 004 yes (7) no 1.5 0.73 0.12 4.7(19) 006 yes (6) no 1.8 0.73 0.16 5.0(19) (0.799,0.832,0.853,0.874,0.892,0.919) 007 yes (2) no 1.5 0.65 0.16 5.1(19) (0.785,0.846) 008 yes (2) no 1.4 0.65 0.14 4.9(19) (0.824,0.840) 009 yes (7) yes 1.4 0.65 0.17 4.8(19) 010 yes yes 1.4 0.65 0.17 4.1(19) (0.785,0.811, some late) 011 yes (5) yes 1.2 0.65 0.17 6.0(19) (small ELMs between 0.7712 and 0.7782, larger ELMs at 0.77869,0.7816,0.79165,0.82137,0.8496 (small), and 0.85023) 012 yes (3) yes 1.5 0.66 0.17 5.9(19) (0.774,0.794,0.820) 013 yes (6) yes 2.2 0.66 0.16 5.3(19) (small- between 0.78-0.81) 014 yes (4) yes 2.0 0.65 0.15 5.1(19) (small ELMs at 0.7877, 0.7902, and 0.7938, and 0.80866, larger ELMs at 0.9397,0.9678) 015 yes (1) yes 2.0 0.63 0.16 5.0(19) (0.766) 024 no yes ICRF heated Ohmic H-mode target 027 no, but QCM no NOTE: outer gap scanned during EDA from 1.0 to 3.0 028 no, but QCM no NOTE: outer gap scanned during EDA from 0.5 to 3.0 029 yes no 2.2 0.16 0.77 6.0(19) (small between 0.81 and 0.87) NOTE: UNFAVORABLE DRIFT DIRECTION The X-pt view camera didn't see much emission; I will have to investigate whether or not I saw anything. Also for many of the shots the camera data did NOT get transferred from the PC to the tree. |
| Physics Operator Summaries |
| Entered: Jul 24 2007 05:16:42:083PM |
| Author: Ian Hutchinson |
| Summary
Succeeded in getting some upper null JFT2-M shapes that did not disrupt. This required backing off on the requested Rxu (making it more positive), to prevent the EF2U from railing at zero. Then a reasonable number of shots were obtained which showed a few elms. None of the attempts to adjust the control system to tolerate the railing of the EF2s was successful. It was observed that the slow oscillations that are triggered are not purely vertical motion. A theory that perhaps the railing of the power supply caused a major coupling to other controllers was put forward. One way to test that and try to prevent it is to zero the EF2 coefficients in the vertical controller. This was carried out (see shot 19) and made no difference. The instability was still present. Of course it is just a guess that the vertical controller was the problem. EF2 is involved in all the controllers, so clearly the railing of one of the EF2s couples all the controllers together in a different way from when it is not. Therefore it is difficult to disentangle which is the major source of the instability. Full scale simulations are probably necessary. Scorecard
Shot,Duration(s),Ipmax(MA),Result Shot,Duration(s),Ipmax,Result
| 1 No Ip | 2 No Ip |
| 03 0.000 0.032 Dud | 04 1.482 0.924 Plasma |
| 05 0.000 0.044 Dud | 06 1.286 0.927 Plasma |
| 07 1.944 0.923 Plasma | 08 1.943 0.924 Plasma |
| 09 1.946 0.928 Plasma | 10 1.943 0.927 Plasma |
| 11 1.720 0.930 Plasma | 12 1.943 0.926 Plasma |
| 13 1.944 0.924 Plasma | 14 1.945 0.922 Plasma |
| 15 1.946 0.928 Plasma | 16 1.945 0.930 Plasma |
| 17 1.943 0.924 Plasma | 18 1.942 0.925 Plasma |
| 19 1.136 0.915 Plasma | 20 0.000 0.049 Dud |
| 21 1.958 0.813 Plasma | 22 1.960 0.809 Plasma |
| 23 1.958 0.811 Plasma | 24 1.959 0.818 Plasma |
| 25 1.959 0.822 Plasma | 26 0.000 0.002 Dud |
| 27 1.960 0.826 Plasma | 28 1.959 0.824 Plasma |
| 29 1.929 0.920 Plasma | 30 0.000 0.048 Fizzle |
| 31 0.363 0.818 Plasma
Date 1070724: 31 shots. 24 plasmas. 1 fizzles. 4 duds. 2 System Error.
(Plasma = Ip gt 60.0 kA Dud = H_alpha lt 0.40 V)
Total plasma duration: 43.01 s (exceeding 100 kA)
|
| Session Leader Comments | |||
| Jul 24 2007 10:41:58:173AM | Jim Terry | Setups for the fast ELM diagnotics:
upper divertor probes (in I_sat mode digitized at 1 MHz from 0.7 to 1.2 s), later in the run use ASP in dwell mode at R=92.0 cm mapped to midplane), initially in sweep mode to get Te, then in I_sat mode Soft x-ray arrays (digitized at 100 kHz for as long as possible starting at 0.8 s), fast magnetics (digitized at 10 MHz from 0.7 to 1.2 s), PCI (digitized at 10 MHz from 0.7 to 1.2 s), ECE with 100 kHz sample rate reflectometry (1 MHz sample rate, with freqs 50, 60, 75, 88, 110 X-pt view camera: 90909 frames/s with 9 microsec integration time fast-diodes: data window was from 0.700 to 1.224 sec diode # trans fiber # view F/no 1 GPI #3 OUTER SOL 36 F/1.4 2 GPI #2 OUTER SOL 22 F/1.4 3 GPI #1 OUTER SOL 5 F/1.4 4 GPI #4 OUTER SOL 23 F/4.0 5 GPI #5 OUTER SOL 10 F/4.0 6 #39 OUTER SOL 9 F/4.0 7 #40 OUTER SOL 7 F/1.4 8 #41 OUTER SOL 11 F/5.6 9 #42 OUTER SOL 12 F/4.0 10 #43 OUTER SOL 13 F/5.6 11 #44 OUTER SOL 14 F/4.0 12 #45 OUTER SOL 6 F/1.4 13 #46 OUTER SOL 29 F/5.6 14 #47 OUTER SOL 31 F/1.4 15 #48 OUTER SOL 32 F/1.4 16 #49 OUTER SOL 33 F/2.8 17 #50 OUTER SOL 34 F/4.0 18 #51 OUTER SOL 35 F/4.0 19 #52 OUTER SOL 3 F/1.4 20 #20 OUTER SOL 37 F/4.0 21 #21 OUTER SOL 38 F/2.8 22 #22 OUTER SOL 39 F/2.8 23 #26 OUTER SOL 40 F/2.0 NINJA puffing D2 from capillaries K-bolo and A-B lim initially with trig at 0.7 s for 0.1 s plenum pressure is 472 mTorr | |
| Aug 1 2007 04:13:53:603PM | Jim Terry | The NINJA history for this run was as follows:
shot capillary trig time duration torr-l torr-l (gauge 1) (gauge 2) 1070724002, AB Lim, 0.700, 0.100, 7.489, 7.794, 0.000 1070724002, K Bolo, 0.700, 0.100 1070724003, AB Lim, 0.700, 0.100, 7.657, 7.976, 0.000 1070724003, K Bolo, 0.700, 0.100 1070724004, AB Lim, 0.700, 0.100, 7.571, 7.902, 0.000 1070724004, K Bolo, 0.700, 0.100 1070724005, AB Lim, 0.650, 0.100, 7.494, 7.814, 0.000 1070724005, K Bolo, 0.650, 0.100 1070724006, AB Lim, 0.650, 0.100, 7.457, 7.792, 0.000 1070724006, K Bolo, 0.650, 0.100 1070724007, AB Lim, 0.650, 0.100, 7.368, 7.673, 0.000 1070724007, K Bolo, 0.650, 0.100 1070724008, AB Lim, 0.650, 0.100, 7.327, 7.672, 0.000 1070724008, K Bolo, 0.650, 0.100 1070724009, AB Lim, 0.650, 0.100, 7.256, 7.520, 0.000 1070724009, K Bolo, 0.650, 0.100 1070724010, AB Lim, 0.650, 0.100, 7.181, 7.456, 0.000 1070724010, K Bolo, 0.650, 0.100 1070724011, AB Lim, 0.650, 0.100, 7.121, 7.412, 0.000 1070724011, K Bolo, 0.650, 0.100 1070724012, AB Lim, 0.650, 0.100, 7.057, 7.384, 0.000 1070724012, K Bolo, 0.650, 0.100 1070724013, AB Lim, 0.650, 0.100, 7.012, 7.285, 0.000 1070724013, K Bolo, 0.650, 0.100 1070724014, AB Lim, 0.650, 0.100, 6.948, 7.141, 0.000 1070724014, K Bolo, 0.650, 0.100 1070724015, AB Lim, 0.650, 0.100, 6.866, 7.077, 0.000 1070724015, K Bolo, 0.650, 0.100 1070724016, AB Lim, 0.620, 0.100, 6.786, 7.165, 0.000 1070724016, K Bolo, 0.620, 0.100 1070724017, AB Lim, 0.620, 0.100, 6.762, 7.138, 0.000 1070724017, K Bolo, 0.620, 0.100 1070724018, AB Lim, 0.620, 0.100, 6.705, 6.888, 0.000 1070724018, K Bolo, 0.620, 0.100 1070724019, AB Lim, 0.620, 0.100, 6.646, 6.940, 0.000 1070724019, K Bolo, 0.620, 0.100 1070724020, AB Lim, 0.620, 0.100, 6.570, 6.880, 0.000 1070724020, K Bolo, 0.620, 0.100 1070724021, AB Lim, 0.620, 0.100, 7.885, 8.240, 0.000 1070724021, K Bolo, 0.620, 0.100 1070724022, AB Lim, 0.620, 0.100, 7.861, 8.194, 0.000 1070724022, K Bolo, 0.620, 0.100 1070724023, AB Lim, 0.620, 0.100, 7.851, 8.148, 0.000 1070724023, K Bolo, 0.620, 0.100 1070724024, AB Lim, 0.620, 0.100, 7.822, 8.167, 0.000 1070724024, K Bolo, 0.620, 0.100 1070724025, AB Lim, 0.620, 0.100, 7.784, 8.142, 0.000 1070724025, K Bolo, 0.620, 0.100 1070724027, AB Lim, 0.620, 0.140, 8.616, 8.926, 0.000 1070724027, K Bolo, 0.620, 0.140 1070724028, AB Lim, 0.620, 0.140, 8.581, 8.832, 0.000 1070724028, K Bolo, 0.620, 0.140 1070724029, AB Lim, 0.620, 0.140, 8.580, 8.773, 0.000 1070724029, K Bolo, 0.620, 0.140 1070724030, AB Lim, 0.620, 0.140, 8.537, 8.780, 0.000 1070724030, K Bolo, 0.620, 0.140 1070724031, AB Lim, 0.620, 0.140, 8.515, 8.788, 0.000 1070724031, K Bolo, 0.620, 0.140 | |
| Jul 24 2007 11:30:38:140AM | 1070724004 | Jim Terry | Good shot
H-mode with some isolated ELMs disrupted at 1.485 s NINJA puffing D2 from capillaries K-bolo and A-B lim initially with trig at 0.7 s for 0.1 s plenum pressure is 472 mTorr Diodes are good, but diode 11 is slughtly saturated. The B-side camera was setup with both lenses at infinity and both apertures open. The view is badly out of focus and saturated (gain=700, shutter=60). nothing obvious on the X-pt camera IR camera didn't take data. |
| Aug 1 2007 10:08:52:480AM | 1070724006 | Jim Terry | Cryopump OFF for this shot
Good shot NL04 of target=5.0e19 outer gap=1.8 cm upper tri=0.73, lower tri=0.16 H-mode with 6 isolated ELMs (0.799,0.832,0.853,0.874,0.892,0.919 s) Best ELMs yet for this run. Good edge soft x-ray data NINJA puffing D2 from capillaries K-bolo and A-B lim initially with trig at 0.6 s for 0.1 s plenum pressure is 472 mTorr |
| Jul 24 2007 11:45:40:470AM | 1070724008 | Jim Terry | Good shot
H-mode with 2 isolated ELMs, goes into EDA NL04 is 1.45e20 at 1.2 s NINJA puffing D2 from capillaries K-bolo and A-B lim initially with trig at 0.7 s for 0.1 s plenum pressure is 472 mTorr |
| Jul 24 2007 11:38:09:833AM | 1070724009 | Jim Terry | Cryopump on this shot - hope is that it will
reduce the density rise. Good shot H-mode with 6 isolated ELMs, goes into EDA pump dropped the H-mode density slightly 1.486e20 at 1.2 s NINJA puffing D2 from capillaries K-bolo and A-B lim initially with trig at 0.7 s for 0.1 s plenum pressure is 472 mTorr |
| Jul 24 2007 03:46:19:167PM | 1070724020 | Jim Terry | For this shot load shot 1070720022 to try and reproduce
the Ohmic H-mode with Type III ELMs. We do this because the radiated power rise is much greater (even for the 2MW of ICRF power) than it was for the earlier ELMing shots. For example for shot 019 the rate of rise in P_rad is at least twice that for shot 004. We have also regained the highly shaped plasmas (upper tri>0.7, lower tri=0.15) Cryopump ON Request no RF. Thus we are not doing the highly-shaped (JFT2M) plasmas any more. Fizzle All diagnostic timings are the same. |
| Jul 24 2007 03:45:44:340PM | 1070724021 | Jim Terry | Cryopump ON
Another attempt for an Ohmic H-mode target. No RF Argon ON at 100 ms puff Successful plasma - short Ohmic H-mode 0.55 to 0.63 s All diagnostic timings are the same. |
| Jul 24 2007 03:45:08:057PM | 1070724022 | Jim Terry | Cryopumping ON
Argon ON Another attempt for an Ohmic H-mode target. No RF Successful plasma - but no H-mode All diagnostic timings are the same. |
| Jul 24 2007 03:44:09:477PM | 1070724023 | Jim Terry | Cryopumping ON
Another attempt for an Ohmic H-mode target. No RF Argon ON at 100 ms puff Successful plasma - Ohmic H-mode from 0.53 to 0.75 s Small ELMs (not Type I) All diagnostic timings are the same. |
| Jul 24 2007 03:44:38:477PM | 1070724024 | Jim Terry | Cryopumping ON
No Argon puff Another attempt for an Ohmic H-mode target. Turn on RF at 0.67 s when the plasma may be in H-mode. Successful plasma - Ohmic H-mode starting at 0.53 with small ELMs (not Type I)- RF injects (1.2 MW) into H-mode, but no ELMs after RF turns on. All diagnostic timings are the same. |
| Jul 24 2007 04:03:32:500PM | 1070724025 | Jim Terry | No Cryopumping because the cyro system is out of LHe
No Argon puff Another attempt for an Ohmic H-mode target. Turn on RF at 0.67 s when the plasma may be in H-mode. Successful plasma - No Ohmic H-mode RF injects (1.85 MW) and makes a long steady EDA, but no ELMs after RF turns on. All diagnostic timings are the same. |
| Jul 24 2007 04:37:00:180PM | 1070724027 | Jim Terry | No Cryopumping
No Argon puff Another attempt for an Ohmic H-mode target. Turn on RF at 0.67 s when the plasma may be in H-mode. Attemp to scan the outer gap from 1.0 cm at 0.76 sec to 3.0 cm at 1.06 s, const after that. Successful plasma - No Ohmic H-mode RF injects (1.85 MW) and makes a long steady EDA, but no ELMs after RF turns on. NINJA puffing D2 from capillaries K-bolo and A-B lim with trig at 0.62 s for 0.14 s (longer duration) plenum pressure is 472 mTorr All other diagnostic timings are the same. |
| Jul 24 2007 04:38:30:180PM | 1070724028 | Jim Terry | No Cryopumping
No Argon puff Another attempt for an Ohmic H-mode target. Turn on RF at 0.67 s when the plasma may be in H-mode. Attemp to scan the outer gap from 0.5 cm at 0.5 sec to 3.0 cm at 1.06 s, const after that. Successful plasma - No Ohmic H-mode RF injects (2 MW) and makes a long steady EDA, but no ELMs after RF turns on. Good outer gap scan. NINJA puffing D2 from capillaries K-bolo and A-B lim with trig at 0.62 s for 0.14 s (longer duration) plenum pressure is 472 mTorr All other diagnostic timings are the same. |
| Jul 24 2007 04:58:36:610PM | 1070724029 | Jim Terry | No Cryopumping
No Argon puff Now try for LSN JFT2M-shaped plasma. Highest available ICRF power Successful plasma - RF injects up to 3 MW with many trips and makes some transient H-modes, with some small ELMs, but with clear precursors NINJA puffing D2 from capillaries K-bolo and A-B lim with trig at 0.62 s for 0.14 s (longer duration) plenum pressure is 472 mTorr All other diagnostic timings are the same. |
| Jul 24 2007 04:59:07:860PM | 1070724030 | Jim Terry | No Cryopumping
No Argon puff Repeat try for LSN JFT2M-shaped plasma. Highest available ICRF power fizzle |
| Jul 24 2007 05:18:04:880PM | 1070724031 | Jim Terry | No Cryopumping
No Argon puff Repeat try for LSN JFT2M-shaped plasma. Highest available ICRF power disrupted at 0.36 s for no obvious reason |
| Physics Operator Comments | |||
| Jul 24 2007 09:19:36:060AM | Ian Hutchinson | Load from 1070719006
Reduce ramp rate of zxl during the .3s+ period by moving the -.08 point to time 0.7s: a ~60% reduction in slew. Raise rxl by about 1cm to try to reduce the negative demand on EF2L. Load. | |
| Jul 24 2007 09:53:11:363AM | 1070724001 | Ian Hutchinson | System failure |
| Jul 24 2007 09:53:20:897AM | 1070724002 | Ian Hutchinson | System Failure |
| Jul 24 2007 10:17:57:080AM | 1070724003 | Ian Hutchinson | EF3 failure. |
| Jul 24 2007 10:33:54:090AM | 1070724004 | Ian Hutchinson | Plasma disrupts at rampdown. Still railing the EF2 upper.
Late breakdown. Lower EF4 to +1330A from +1335A. Increase slow Zcur Derivative to 1.5 from .7 to try to stabilize. zxl to -.05 from -.08 to try to avoid ef2u saturations. |
| Jul 24 2007 11:00:25:167AM | 1070724005 | Ian Hutchinson | Dud. Cryopump ran amok and lowered fill to .02mtorr. |
| Jul 24 2007 01:22:21:610PM | 1070724006 | Ian Hutchinson | Plasma. If anything more unstable.
Rxu to -.03 from -.055. Proportional to 3 from 4. |
| Jul 24 2007 11:26:39:070AM | 1070724007 | Ian Hutchinson | Plasma. EF2U comes out of saturation and we lose the vertical instability.
Triangularity about 0.6 upper. EF4 to -1300A from -2000A in segment 2 to try to adjust the EF2 balance. |
| Jul 24 2007 11:36:29:973AM | 1070724008 | Ian Hutchinson | Plasma. Slightly more oscillation on coil currents, but still not saturated.
Triangularity about .63 upper. Cryopump turning on. Raise fill puff to 32 ms. Small tweak of EF4 when it is supposed to cross over, to moderate lurch. |
| Jul 24 2007 11:46:02:047AM | 1070724009 | Ian Hutchinson | Plasma. Somewhat lower density rise rate and more elms.
Lower nl04 demand to .4 from .5 Decrease EF4 gain in an additional step at .2s. Allow EF4 to be higher before .5s. |
| Jul 24 2007 11:59:48:280AM | 1070724010 | Ian Hutchinson | Plasma. Pellet injected in ramp down.
Got earlier EF4 crossover but still there seem to be a lot of wiggles on the EF2/EF4 system. Add Derivative of .5 to ef2byef4 nl04 to .6 |
| Jul 24 2007 12:14:52:877PM | 1070724011 | Ian Hutchinson | Plasma. Disrupts at pellet injection.
Further EF4 tweaks. Derivative to 1. |
| Jul 24 2007 12:31:56:927PM | 1070724012 | Ian Hutchinson | Plasma.
Ef2byef4 proportional to 1.5 from 2. Tweak ef4 value. |
| Jul 24 2007 12:49:36:200PM | 1070724013 | Ian Hutchinson | Plasma.
Set ef2byef4 to a rational value: 2500 instead of 4000. Then set EF4 to be what we really want it to be so the two controllers are not fighting each other. |
| Jul 24 2007 01:01:00:557PM | 1070724014 | Ian Hutchinson | Plasma.
Adjustments of the ef2/ef4 system successful. We are now not fighting so much. Lower slow zcur derivative back down to 1. |
| Jul 24 2007 01:23:14:440PM | 1070724015 | Ian Hutchinson | Plasma.
Slow zcur. Enter a new controller at time 0.5. XCONTIHH. Call it. Inspect it. For some reason there are differences with the old one. There should not be The differences are small. Ignore them for now. Edit the controller. Zero the EF2 gains in this controller. Zxl to +0.005. |
| Jul 24 2007 01:32:47:920PM | 1070724016 | Ian Hutchinson | Plasma. New controller runs ok. Plasma did not change much.
Rxu to -.04 from -.03 to increase the upper triangularity. Lower EF4 early to try to keep it from zeroing prior to .5s |
| Jul 24 2007 01:47:49:470PM | 1070724017 | Ian Hutchinson | Plasma. Got upper triangularity in the 0.65 ballpark. EF2s did not quite saturate.
Rxu to -.05. |
| Jul 24 2007 02:03:42:470PM | 1070724018 | Ian Hutchinson | Plasma. EF2U bounces into and out of the rail but not a problem.
Increase Rcur by 0.005 to drop right gap to 2cm. |
| Jul 24 2007 02:27:00:637PM | 1070724019 | Ian Hutchinson | Plasma disrupts at 1.12s because of slowly growing oscillation.
This shows that simply removing the EF2 from the slow zcur controller does not fix the slow vertical instability when EF2U rails. Looking at the equilibrium, it looks as if the oscillation in predominantly in the upper x-point position, which goes in a somewhat circular motion. The vertical position is, of course, also affected. Move second slow-zcur controller switch out of the way to 2.5s. Load from 1070720022. Load. |
| Jul 24 2007 02:42:59:940PM | 1070724020 | Ian Hutchinson | Fizzle.
Import segment 1 from shot 19. Load. |
| Jul 24 2007 03:09:36:140PM | 1070724021 | Ian Hutchinson | Plasma.
Argon puff to 10ms from 100ms. (I.e. pretty much off.) |
| Jul 24 2007 03:26:11:830PM | 1070724022 | Ian Hutchinson | Plasma. Still no real H-mode.
Raise current to 1 MA. |
| Jul 24 2007 03:44:38:557PM | 1070724023 | Ian Hutchinson | Plasma. But only .8MA. I now realize that I ought to have been changing segment 3 not segment 2.
Set Argon REALLY off. But leave at 0.8MA. |
| Jul 24 2007 03:58:28:713PM | 1070724024 | Ian Hutchinson | Plasma.
Set fill puff to 21ms because of cryopump out of helium. |
| Jul 24 2007 04:20:35:457PM | 1070724025 | Ian Hutchinson | Plasma.
Set gap scan to increase the gap by 2cm from .76s to 1.06s. |
| Jul 24 2007 04:20:51:190PM | 1070724026 | Ian Hutchinson | No power shot because I made a mistake. |
| Jul 24 2007 04:35:59:130PM | 1070724027 | Ian Hutchinson | Plasma. Got the gap scan we wanted.
Start the scan further in and earlier. |
| Jul 24 2007 04:45:51:970PM | 1070724028 | Ian Hutchinson | Plasma.
Load segment 2 from 1060503022. Do the calls and flips for abnormal field and broken loops. Set Ar to negligible pulse. |
| Jul 24 2007 04:52:07:227PM | 1070724029 | Ian Hutchinson | Plasma. Some EF2L railing.
Tweak the ef2/ef4 system feedback in the same way as we did for the upper null shot to get sensible balancing and control instead of fighting two incorrect settings. |
| Jul 24 2007 05:04:21:587PM | 1070724030 | Ian Hutchinson | Fizzle.
Br offset to .0025 from .002. |
| Jul 24 2007 05:05:30:650PM | 1070724031 | Ian Hutchinson | Plasma disrupts at 0.36. Looks like a brick. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:18:43:140AM | Plasma | Bad | network failure |
| 2 | 09:39:28:460AM | Plasma | Bad | network problem |
| 3 | 09:51:18:470AM | Plasma | Bad | EF3 Aux PS opened before shot |
| 4 | 10:07:55:053AM | Plasma | Ok | |
| 5 | 10:31:16:090AM | Plasma | Ok | |
| 6 | 10:47:47:493AM | Plasma | Ok | |
| 7 | 11:02:56:857AM | Plasma | Ok | |
| 8 | 11:17:30:657AM | Plasma | Ok | |
| 9 | 11:30:13:747AM | Plasma | Ok | |
| 10 | 11:44:01:217AM | Plasma | Ok | |
| 11 | 11:57:51:733AM | Plasma | Ok | |
| 12 | 12:13:17:297PM | Plasma | Ok | |
| 13 | 12:27:49:500PM | Plasma | Ok | |
| 14 | 12:40:52:487PM | Plasma | Ok | |
| 15 | 12:57:26:707PM | Plasma | Ok | |
| 16 | 01:16:16:760PM | Plasma | Ok | |
| 17 | 01:28:53:463PM | Plasma | Ok | |
| 18 | 01:42:31:570PM | Plasma | Ok | |
| 19 | 02:01:47:453PM | Plasma | Ok | |
| 20 | 02:24:44:027PM | Plasma | Ok | |
| 21 | 02:41:23:077PM | Plasma | Ok | |
| 22 | 02:54:30:483PM | Plasma | Ok | |
| 23 | 03:12:57:177PM | Plasma | Ok | |
| 24 | 03:28:41:053PM | Plasma | Ok | |
| 25 | 03:45:46:620PM | Plasma | Ok | |
| 26 | 03:59:16:417PM | Test | Ok | This was a requested no power shot |
| 27 | 04:11:58:027PM | Plasma | Ok | |
| 28 | 04:24:40:103PM | Plasma | Ok | |
| 29 | 04:37:11:727PM | Plasma | Ok | |
| 30 | 04:49:57:630PM | Plasma | Ok | |
| 31 | 05:02:29:350PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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