| Miniproposals | ||||||||||||
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| Operators | |
| Session leader(s): | Sanjay Gangadhara,Brian Labombard |
| Physics operator(s): | Earl Marmar |
| Engineering operator(s): | Bill Parkin,Gary Dekow |
| Engineering Operator Run Comment |
| MP 276 Transport Experiments in the Scrape-Off Layer during Ohmic L- and |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:24:790PM |
| Author: To Be Determined |
| Run Plan and Engineering setup for 1000908 MP276 Transport Experiments in the Scrape-Off Layer during Ohmic L- and H-mode using Gas-Injection Plumes Session Leader: S. Gangadhara/B. LaBombard Physics Operator: E. Marmar Engineering Setup: Overnight ECDC in D2, stopping 1-2 hours prior to the run. Run begins at 9:00 and ends at 17:00. Power system setup as on 1000908001 (0.8 MA, 5.3 T, LSN diverted) Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid ENABLED leave B-side upper as is Hybrid DISABLED 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 ------------------------------------------------------------------------- Impurity transport in the scrape-off layer (SOL) is of fundamental importance in tokamak plasmas. It is clear that the physical processes involved must be fully characterized and understood in order to predict core impurity levels in future tokamak reactors. A direct means of inferring information about impurity transport in the edge plasma is to inject impurities locally into the SOL through the ``fast-burping'' probe and study the resultant impurity dispersal patterns (``plumes''). Plumes can yield information about local parallel and cross-field transport in the edge, as well as information about local electric field structure. Experiments will be conducted using deuterated ethylene (C2D4) as the injected gas, with typically ~ 5 x 10^16 molecules of gas injected per probe scan. C^+1 (CII) and C^+2 (CIII) emission will be imaged simultaneously from two near-perpendicular views (F-top, F-side) using optical systems containing coherent fiber bundles coupled to gated, intensified CCD cameras through beam-splitter optics and bandpass interference filters. Experiments will be conducted during ohmic conditions, to obtain optimal FSP data. We wish to investigate: (1) the dependence of cross-field spreading (i.e. cross-field transport) of C^+1 and C^+2 emission at fixed locations in the SOL as a function of density (or collisionality) during Ohmic L-mode, and (2) the dependence of cross-field transport on SOL location (rho) for fixed discharge conditions during both Ohmic L-mode and Ohmic H-mode. Run Plan: Day 1: Ohmic L-mode density scan A density scan will be conducted to determine if plume character varies with edge collisionality. ``Shallow'' (in the far SOL) and ``Deep'' (near the separatrix) scans will be conducted to characterize transport variation with rho. I_p = 0.8 MA, B_T = 5.3 T Shot plan: 1-6 NL04=1.0e20, setup FSP target, gas, optimal camera exposures 7-8 NL04=1.0e20, ``shallow'' and ``deep'' FSP insertion, C2D4 plumes 9-11 NL04=0.8e20, ``shallow'' and ``deep'' FSP insertion 12-14 NL04=0.6e20, ``shallow'' and ``deep'' FSP insertion 15 NL04=1.0e20, ``deep'' insertion of FSP 16-18 NL04=1.2e20, ``shallow'' and ``deep'' FSP insertion 19-21 NL04=1.4e20, ``shallow'' and ``deep'' FSP insertion --------------------------------- Results: A good day. The first few shots of the day were used to assess background carbon levels. Gas injection started on shot 4. The probe was scanned three times during each discharge, at 0.7, 0.9, and 1.1 seconds. Density started at NL04=1.0e20, was reduced to 0.5e20, and then raised back up to 1.2e20. Injection location varied from rho = 0 mm (right at the separatrix) out to rho = ~ +20 mm at each density. In the far SOL plumes, cross-field dispersion indicative of ExB flows was observed in both top and side views for all densities. The dispersion was relatively uniform along the plume length, consistent with having small electric fields and long ion lifetimes in this region. Strong flows to the divertor were also observed in these cases. For plumes located closer to the separatrix, the nature of the cross-field dispersion changed to a ``boomeranging''-type character, with dispersion varying along the plume length. At the highest densities, plumes generated at the separatrix appeared as though they ``hit a wall'', the cross-field dispersion being highly asymmetric with most emission located in the direction away from the separatrix. Parallel flow reversal was also observed for plumes near the separatrix. Plenty of analysis awaits, but this run produced plenty of good data to look at. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:11:957PM |
| Author: To Be Determined |
| Engineering setup for 1000908: Overnight ECDC in D2, stopping 1-2 hours prior to the run. Run begins at 9:00 and ends at 17:00. Power system setup as on 1000907 (0.8 MA, 5.3 T, LSN diverted) Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid ENABLED leave B-side upper as is Hybrid DISABLED 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 ------------------------------------------------------------------------------- Run plan for 1000908: PO: Marmar EO: Dekow/Parkin SL: LaBombard/Gangadhara MP 276 -- Transport Experiments in the Scrape-Off Layer during Ohmic L- and H-mode using Gas-Injection Plumes _______________________________________________________________________________ Results: A boring run from the physop point of view. The machine ran reliably, with density scans from 0.5e20 to 1.2e20. There was 1 fizzle, probably because B_R wandered a little bit too negative. The DNB was firing on many shots, but because they were injecting from 1.4 to 1.5 seconds, the H_2 gas puff doesn't start until -0.1 seconds, so it had little effect on the pressure at breakdown (<10%). The probe boys were happily poking and injecting; see the session leader summary for details. We tested out the silver-doped lithium pellets (single barrel on shot 15, double barrel on shot 18); both shots disrupted, but Bob Granetz was disappointed because of the lack of clear thermal quenches. I fooled around with the ramp-down, and finally got decent survival at high-ish density on shots 24 and 25. Shot 1 was inadvertently outboard limited. This was the result of copying copying waveforms from an old shot, when the offsets were different, for CLEARIN and RCUR. See the e-mail sent to all physops from Steve Wolfe for details. There was no RF or between-shot ECDC today. Scorecard: 24 plasmas 1 fizzle __ 25 data system cycles ---------------------------------------------------------------------------- 1000908001 marmar PHYSICS_OPERATOR Sep 8 2000 9:27:36:840AM . . . . . . . . . . . . . . . . . . . . loaded from 1000907001 pasted in programming for RCUR, ZCUR, CLEARIN, RXL, ZXL, RXU, ZXU and NL04 from 1000517019 Argon enabled for first shot plasma outboard limited ----------------------------------------------------------------------------- 1000908002 marmar PHYSICS_OPERATOR Sep 8 2000 9:34:23:280AM . . . . . . . . . . . . . . . . . . . . change RCUR and CLEARIN to fix gaps lower nl04 prog to 0.9e20 TF current to -150kA in seg 2 plasma ----------------------------------------------------------------------------- 1000908003 marmar PHYSICS_OPERATOR Sep 8 2000 9:50:18:340AM . . . . . . . . . . . . . . . . . . . . no PCS changes plasma disrupt at 1.3 seconds (too elongated) ----------------------------------------------------------------------------- 1000908004 marmar PHYSICS_OPERATOR Sep 8 2000 10:06:52:890AM . . . . . . . . . . . . . . . . . . . . reduce outer gap, RCUR out by 3 mm plasma outer gap 1.6 cm ----------------------------------------------------------------------------- 1000908005 marmar PHYSICS_OPERATOR Sep 8 2000 10:44:07:763AM . . . . . . . . . . . . . . . . . . . . tweak RCUR after 1.2 seconds plasma ----------------------------------------------------------------------------- 1000908006 marmar PHYSICS_OPERATOR Sep 8 2000 10:44:20:873AM . . . . . . . . . . . . . . . . . . . . no PCS changes plasma ----------------------------------------------------------------------------- 1000908007 marmar PHYSICS_OPERATOR Sep 8 2000 11:00:46:670AM . . . . . . . . . . . . . . . . . . . . DNB enabled for this shot; should fire at 1.4 s reduce prepuff by 2 ms tweak rampdown shape plasma ----------------------------------------------------------------------------- 1000908008 marmar PHYSICS_OPERATOR Sep 8 2000 11:15:40:920AM . . . . . . . . . . . . . . . . . . . . add 2 msec back to prepuff plasma ----------------------------------------------------------------------------- 1000908009 marmar PHYSICS_OPERATOR Sep 8 2000 11:39:20:060AM . . . . . . . . . . . . . . . . . . . . add 10 ms to argon puff shape tweaks after 1.8 seconds plasma ----------------------------------------------------------------------------- 1000908010 marmar PHYSICS_OPERATOR Sep 8 2000 12:12:00:606PM . . . . . . . . . . . . . . . . . . . . RCUR tweaks after 1.2 seconds plasma ----------------------------------------------------------------------------- 1000908011 marmar PHYSICS_OPERATOR Sep 8 2000 12:12:23:686PM . . . . . . . . . . . . . . . . . . . . lower nl04 prog to 7.2e19 plasma ----------------------------------------------------------------------------- 1000908012 marmar PHYSICS_OPERATOR Sep 8 2000 12:44:10:530PM . . . . . . . . . . . . . . . . . . . . no PCS changes plasma ----------------------------------------------------------------------------- 1000908013 marmar PHYSICS_OPERATOR Sep 8 2000 12:45:25:233PM . . . . . . . . . . . . . . . . . . . . no PCS changes plasma ----------------------------------------------------------------------------- 1000908014 marmar PHYSICS_OPERATOR Sep 8 2000 1:28:11:936PM . . . . . . . . . . . . . . . . . . . . tweak seg 1 PG3 puff plasma ----------------------------------------------------------------------------- 1000908015 marmar PHYSICS_OPERATOR Sep 8 2000 1:28:48:686PM . . . . . . . . . . . . . . . . . . . . no PCS changes plasma silver doped killer pellet at 1.6 seconds -- disrupt ----------------------------------------------------------------------------- 1000908016 marmar PHYSICS_OPERATOR Sep 8 2000 1:50:37:250PM . . . . . . . . . . . . . . . . . . . . nl04 prog to 6e19 plasma density not as low as requested ----------------------------------------------------------------------------- 1000908017 marmar PHYSICS_OPERATOR Sep 8 2000 2:39:03:233PM . . . . . . . . . . . . . . . . . . . . reduce PG3 voltage prog in segment 2 reduce nl04 programming early in segment 2 plasma density still rising during shot ----------------------------------------------------------------------------- 1000908018 marmar PHYSICS_OPERATOR Sep 8 2000 2:39:35:060PM . . . . . . . . . . . . . . . . . . . . turn off NINJA helium puff plasma got constant density ----------------------------------------------------------------------------- 1000908019 marmar PHYSICS_OPERATOR Sep 8 2000 2:54:01:200PM . . . . . . . . . . . . . . . . . . . . nl04 prog to 5e19 reduce PG3 preprog voltage to 0 at .36 seconds plasma got the density as requested ----------------------------------------------------------------------------- 1000908020 marmar PHYSICS_OPERATOR Sep 8 2000 3:14:02:140PM . . . . . . . . . . . . . . . . . . . . no PCS changes fizzle ----------------------------------------------------------------------------- 1000908021 marmar PHYSICS_OPERATOR Sep 8 2000 3:32:07:140PM . . . . . . . . . . . . . . . . . . . . B_r offset increased by 0.5 mT plasma ----------------------------------------------------------------------------- 1000908022 marmar PHYSICS_OPERATOR Sep 8 2000 3:50:23:513PM . . . . . . . . . . . . . . . . . . . . nl04 prg to 1e20 plasma got ~9.2e20 ----------------------------------------------------------------------------- 1000908023 marmar PHYSICS_OPERATOR Sep 8 2000 4:21:25:623PM . . . . . . . . . . . . . . . . . . . . nl04 prog to 1.2e20 fiddle with rampdown (RCUR in farther) plasma ----------------------------------------------------------------------------- 1000908024 marmar PHYSICS_OPERATOR Sep 8 2000 4:37:28:560PM . . . . . . . . . . . . . . . . . . . . tweak ZXL during rampdown plasma better rampdown ----------------------------------------------------------------------------- 1000908025 marmar PHYSICS_OPERATOR Sep 8 2000 5:05:02:530PM . . . . . . . . . . . . . . . . . . . . no PCS changes plasma |
| Session Leader Comments | |||
| Sep 8 2000 08:53:43:560AM | Run plan for 1000908: MP 276 -- Transport Experiments in the Scrape-Off Layer during Ohmic L- and H-mode using Gas-Injection Plumes Day 1: Ohmic L-mode density scan A density scan will be conducted to determine if plume character varies with edge collisionality. ``Shallow'' (in the far SOL) and ``Deep'' (near the separatrix) scans will be conducted to characterize transport variation with rho. I_p = 0.8 MA, B_T = 5.3 T Shot plan: 1-6 NL04=1.0e20, setup FSP target, gas, optimal camera exposures 7-8 NL04=1.0e20, ``shallow'' and ``deep'' FSP insertion, C_2D_4 plumes 9-11 NL04=0.8e20, ``shallow'' and ``deep'' FSP insertion 12-14 NL04=0.6e20, ``shallow'' and ``deep'' FSP insertion 15 NL04=1.0e20, ``deep'' insertion of FSP 16-18 NL04=1.2e20, ``shallow'' and ``deep'' FSP insertion 19-21 NL04=1.4e20, ``shallow'' and ``deep'' FSP insertion | ||
| Sep 8 2000 09:26:50:467AM | 1000908001 | BFSP background shot For the first shot, not firing the probe or injecting gas. Use to determine background carbon light levels. PPPL Xybion gates: 0.60 ms, 0.60 ms, 0.60 ms LANL Xybion gates: 1.05 ms, 1.025 ms, 1.05 ms Background levels are low, just visible. This indicates that the exposures are at an appropriate level. Next shot - didn't quite get Ip = 0.8 MA, NL04 = 1.0e20 Try again, and fire FSP this time. | |
| Sep 8 2000 09:39:54:467AM | 1000908002 | BFSP background shot Did not fire the probe or inject gas. Again, use to determine background carbon light levels, and for conditioning of the ASP. PPPL Xybion gates: 0.60 ms, 0.60 ms, 0.60 ms LANL Xybion gates: 1.05 ms, 1.025 ms, 1.05 ms Very low background levels - can barely be seen. Was last shot influence of being outboard limited? Next shot - fire FSP, inject gas, go for a plume! | |
| Sep 8 2000 09:49:38:090AM | 1000908003 | BFSP Injection of C2D4 15.4 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec shallow insertion of FSP (~ +10 mm) PPPL Xybion gates (SVC): 0.60 ms, 0.60 ms, 0.60 ms LANL Xybion gates (TVC): 1.05 ms, 1.05 ms, 1.05 ms Viewing through CII/CIII beam-splitter Didn't turn the NINJA trigger on in time, so no plume for this shot. Did get nice background snaps with FSP inserted - see significant levels of carbon light even in this case. May be useful for modelling of carbon neutral profile. Next shot - repeat, with NINJA trigger ON for gas injection. | |
| Sep 8 2000 10:32:14:513AM | 1000908004 | BFSP Injection of C2D4 15.4 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec medium insertion of FSP (~ +4-6 mm, as LCFS pulls away from probe) PPPL Xybion gates (SVC): 0.60 ms, 0.60 ms, 0.60 ms LANL Xybion gates (TVC): 1.05 ms, 1.05 ms, 1.05 ms Viewing through CII/CIII beam-splitter Great data on both cameras! Can slightly increase PPPL gates, because pixel values are near ~ 190. Saturation on LANL camera at probe head, and good values for CIII just outside of the probe head. CII levels are slightly lower on this camera, but still okay. Raise last exposure for this camera because images were slightly dimmer. Next shot - repeat, with slightly modified exposures. | |
| Sep 8 2000 10:33:17:733AM | 1000908005 | BFSP Injection of C2D4 15.3 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec medium insertion of FSP (~ +4-6 mm, as LCFS pulls away from probe) PPPL Xybion gates (SVC): 0.70 ms, 0.70 ms, 0.70 ms LANL Xybion gates (TVC): 1.05 ms, 1.05 ms, 1.15 ms Viewing through CII/CIII beam-splitter Good data. For PPPL data, first scan is somewhat diffuse, second scan is good (evidence of boomeranging), and third scan is completely diffuse. Gas injection levels may be too low, and last scan in general has lowest gas injected. Values for pixels are again < ~ 190 or so. For LANL data, data is good. CII levels are again slighty lower, but good. Emission is much more symmetric than in side view. Next shot - increase gas in plenum, and decrease exposures accordingly. | |
| Sep 8 2000 10:55:31:340AM | 1000908006 | BFSP Injection of C2D4 17.6 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "medium" insertion of FSP (~ +4-6 mm, as LCFS pulls away from probe) PPPL Xybion gates (SVC): 0.55 ms, 0.60 ms, 0.60 ms LANL Xybion gates (TVC): 1.00 ms, 1.00 ms, 1.05 ms Viewing through CII/CIII beam-splitter Good PPPL data! First two scans have good data. Last scan the exposure was somewhat high - turn down exposure. For first two scans of LANL data, exposures were apparently too low - didn't get out of the background. For last scan exposure was too high - got "blasted". Difference is small between these exposures - may have to do with changing plasma conditions? Next shot - move probe out additional +5 mm, generate plumes in far SOL. Change exposures to try and compensate. | |
| Sep 8 2000 11:08:31:953AM | 1000908007 | BFSP Injection of C2D4 17.5 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "shallow" insertion of FSP (~ +9-11 mm, as LCFS pulls away from probe) PPPL Xybion gates (SVC): 0.55 ms, 0.55 ms, 0.55 ms LANL Xybion gates (TVC): 1.00 ms, 1.00 ms, 1.00 ms Viewing through CII/CIII beam-splitter. Good PPPL data! Again, first two scans of LANL camera were low. Realized that that was because the first two scans were really at 0.1 ms, not 1.0 ms! Typo in widget. Based on last scan, exposures were slightly high, so will reduce them for next shot. Next shot - try again, in far SOL, with proper exposures. | |
| Sep 8 2000 11:19:53:903AM | 1000908008 | BFSP Injection of C2D4 17.4 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "shallow" insertion of FSP (~ +9-11 mm, as LCFS pulls away from probe) PPPL Xybion gates (SVC): 0.55 ms, 0.55 ms, 0.55 ms LANL Xybion gates (TVC): 0.85 ms, 0.85 ms, 0.85 ms Viewing through CII/CIII beam-splitter. Great PPPL data! Near saturation, but not saturated. Plumes look rather wide. LANL data is good. Got some saturation near the probe head. Plumes look narrow (in cross-field direction), comparable to plumes we saw at "medium" insertion. Next shot - deep scan (target +2 mm), and change exposures accordingly. | |
| Sep 8 2000 11:37:45:780AM | 1000908009 | BFSP Injection of C2D4 17.3 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "deep" insertion of FSP (~ +2-4 mm, as LCFS pulls away from probe) PPPL Xybion gates (SVC): 0.50 ms, 0.50 ms, 0.50 ms LANL Xybion gates (TVC): 0.70 ms, 0.70 ms, 0.70 ms Viewing through CII/CIII beam-splitter. Good data on both cameras. Neither reached saturation, and PPPL camera had slightly low signal. Some small evidence of boomeranging on side view, but no dramatic difference in plume structure. Next shot - go in even deeper, and see if we see any changes. | |
| Sep 8 2000 12:01:58:497PM | 1000908010 | BFSP Injection of C2D4 17.3 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "very deep" insertion of FSP (~ +0-2 mm, as LCFS pulls away from probe) PPPL Xybion gates (SVC): 0.50 ms, 0.50 ms, 0.50 ms LANL Xybion gates (TVC): 0.60 ms, 0.60 ms, 0.60 ms Viewing through CII/CIII beam-splitter. Good data. Exposures were slightly low, especially for LANL camera, but still get good signal-to-noise. For first two scans we were right at separatrix, and see difference in plume structure. From side view, it is as if plume "hits a wall" - very diffuse below injection, and steep decrease above injection. From top view, still seems symmetric up-down, but narrower. Good for comparison with previous data. Next shot - decrease density by 20% (NL01 ~ 0.8e20). Inject in "medium" SOL (~ +5 mm) and adjust exposures accordingly. | |
| Sep 8 2000 12:18:00:670PM | 1000908011 | BFSP Injection of C2D4 17.2 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "medium" insertion of FSP (~ +4-6 mm, as LCFS pulls away from probe) PPPL Xybion gates (SVC): 0.60 ms, 0.60 ms, 0.60 ms LANL Xybion gates (TVC): 0.80 ms, 0.80 ms, 0.80 ms Viewing through CII/CIII beam-splitter. Good data on both views! PPPL has slightly low exposure, and the LANL camera slightly high exposure. Stronger evidence for boomeranging in side view (possibly different E fields or because density is lower so that ionization lifetimes are higher). Top view looks narrower than at higher density. Next shot - inject deeper (~ +10 mm), and adjust exposures accordingly. | |
| Sep 8 2000 12:35:14:920PM | 1000908012 | BFSP Injection of C2D4 17.1 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "shallow" insertion of FSP (~ +10-12 mm, as LCFS pulls away from probe) PPPL Xybion gates (SVC): 0.65 ms, 0.65 ms, 0.65 ms LANL Xybion gates (TVC): 0.80 ms, 0.80 ms, 0.80 ms Viewing through CII/CIII beam-splitter. Great data on both cameras. Exposures may be slightly low for LANL camera, but still good. Still see strong boomeranging on side view, and plume centroid may be slightly lower than at previous insertion depth. No noticeable difference in top view (awaiting further analysis...) Next shot - go out even further in SOL (~ +15 mm) | |
| Sep 8 2000 12:55:15:857PM | 1000908013 | BFSP Injection of C2D4 17.1 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "very shallow" insertion of FSP (~ +15-17 mm, as LCFS pulls away from probe) PPPL Xybion gates (SVC): 0.70 ms, 0.70 ms, 0.70 ms LANL Xybion gates (TVC): 0.85 ms, 0.85 ms, 0.85 ms Viewing through CII/CIII beam-splitter. Great data on both views. Asymmetries seen in emission from side and top view which would indicate that the impurities are "ExB-flowing" along the flux surface where they are injected. Exposures are good. Next shot - go right to the separatrix (~ +0 mm) and adjust exposures accordingly. | |
| Sep 8 2000 01:14:53:500PM | 1000908014 | BFSP Injection of C2D4 16.9 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "very deep" insertion of FSP (~ +0-2 mm, as LCFS pulls away from probe) PPPL Xybion gates (SVC): 0.55 ms, 0.55 ms, 0.55 ms LANL Xybion gates (TVC): 0.70 ms, 0.70 ms, 0.70 ms Viewing through CII/CIII beam-splitter. For first scan, plume again looks like it "hits a wall", especially from side view. Top view is completely saturated for this scan. On second scan there is more dispersal, and lower intensity, and on third scan plumes look very dispersed. Rho is changing with scans, but not sure what else could be creating these dramatic differences. Next shot - pull probe out ~ +0.5 mm (saw some arcing on first scan), and adjust exposures so that no saturation occurs on any scan. | |
| Sep 8 2000 01:31:32:090PM | 1000908015 | BFSP Injection of C2D4 16.8 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "very deep" insertion of FSP (~ +0-2 mm, as LCFS pulls away from probe) PPPL Xybion gates (SVC): 0.450 ms, 0.515 ms, 0.55 ms LANL Xybion gates (TVC): 0.500 ms, 0.575 ms, 0.70 ms Viewing through CII/CIII beam-splitter. Good data, but exposures were low. Looks like we didn't get close enough to separatrix to hit the wall. Still have interesting data - on third scan see asymmetries in both views again indicative of ExB flows. Next shot - lower density to 0.6e20, probe far out in SOL, and adjust exposures accordingly. | |
| Sep 8 2000 01:56:42:450PM | 1000908016 | BFSP Injection of C2D4 16.7 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "very shallow" insertion of FSP (~ +15-17 mm, as LCFS pulls away from probe) PPPL Xybion gates (SVC): 0.75 ms, 0.75 ms, 0.75 ms LANL Xybion gates (TVC): 0.90 ms, 0.90 ms, 0.90 ms Viewing through CII/CIII beam-splitter. Good data on both cameras. Plume is near the bottom of the side view - we are really far out in the SOL. See a very skewed emission on both side and top views, primarily in CIII emission. CII emission is more symmetric. Exposures are good - a little low for top view, but also have saturation near the probe head. Next shot - insert probe deeper (~ +7-8 mm) | |
| Sep 8 2000 02:16:12:110PM | 1000908017 | BFSP Injection of C2D4 16.6 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "medium" insertion of FSP (~ +7-9 mm, as LCFS pulls away from probe) PPPL Xybion gates (SVC): 0.70 ms, 0.70 ms, 0.70 ms LANL Xybion gates (TVC): 0.85 ms, 0.85 ms, 0.85 ms Viewing through CII/CIII beam-splitter. Good data. Exposures on top camera are slightly low. See definite boomeranging on side view, both CII and CIII emission. Emission from top view is still asymmetrically skewed, but not as dramatically. Next shot - up to separatrix. | |
| Sep 8 2000 02:38:51:310PM | 1000908018 | BFSP Injection of C2D4 16.5 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "very deep" insertion of FSP (~ +0-2 mm, as LCFS pulls away from probe) PPPL Xybion gates (SVC): 0.65 ms, 0.675 ms, 0.675 ms LANL Xybion gates (TVC): 0.80 ms, 0.825 ms, 0.850 ms Viewing through CII/CIII beam-splitter. Good data on both cameras, with low exposures on LANL camera. Strong boomeranging on side view. Slight skewedness on top view, but camera distortion needs to be taken out. No "wall" is apparent. Next shot - go down in density somewhat more (have been around 0.65-0.70e20 the last few shots) and probe far in SOL. | |
| Sep 8 2000 03:02:59:763PM | 1000908019 | BFSP Injection of C2D4 16.5 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "very shallow" insertion of FSP (~ +20-22 mm, as LCFS pulls away from probe) NL04 = 0.5e20 PPPL Xybion gates (SVC): 0.775 ms, 0.775 ms, 0.775 ms LANL Xybion gates (TVC): 0.915 ms, 0.915 ms, 0.915 ms Viewing through CII/CIII beam-splitter. Great data on both cameras. See large "fan" of asymmetry on top view, similar to "very shallow" plume from 0.65e20 shot (shot 16). Good case where CII emission can be used as source for CIII modelling, because plumes are large enough, and in side view see definite "downward" transport (ExB?) of impurities. Next shot - same density, insert slightly deeper. | |
| Sep 8 2000 03:11:30:000PM | 1000908020 | BFSP Injection of C2D4 16.4 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "very shallow" insertion of FSP (~ +20-22 mm, as LCFS pulls away from probe) NL04 = 0.5e20 PPPL Xybion gates (SVC): 0.750 ms, 0.750 ms, 0.750 ms LANL Xybion gates (TVC): 0.935 ms, 0.935 ms, 0.935 ms Viewing through CII/CIII beam-splitter. Fizzle. Try again. | |
| Sep 8 2000 03:37:35:263PM | 1000908021 | BFSP Injection of C2D4 16.4 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "very shallow" insertion of FSP (~ +20-22 mm, as LCFS pulls away from probe) NL04 = 0.5e20 PPPL Xybion gates (SVC): 0.750 ms, 0.750 ms, 0.750 ms LANL Xybion gates (TVC): 0.935 ms, 0.935 ms, 0.935 ms Viewing through CII/CIII beam-splitter. Good data, with low light levels. This seems to be primarily because of the "wispy", dispersed nature of the emission. Very low light levels on scan 3. Next shot - go back to NL04=1.0e20, and poke in far SOL. | |
| Sep 8 2000 03:53:34:043PM | 1000908022 | BFSP Injection of C2D4 16.2 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "very shallow" insertion of FSP (~ +20-22 mm, as LCFS pulls away from probe) NL04 = 1.0e20 PPPL Xybion gates (SVC): 0.575 ms, 0.575 ms, 0.575 ms LANL Xybion gates (TVC): 0.850 ms, 0.850 ms, 0.850 ms Viewing through CII/CIII beam-splitter. Great data on both cameras. Good pixel levels. See "fanning" action again in top view. Side view indicates flow to the divertor. Next shot - increase density again, to 1.2e20, and stay at this location. | |
| Sep 8 2000 04:19:50:903PM | 1000908023 | BFSP Injection of C2D4 16.1 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "very shallow" insertion of FSP (~ +20-22 mm, as LCFS pulls away from probe) NL04 = 1.2e20 PPPL Xybion gates (SVC): 0.525 ms, 0.525 ms, 0.525 ms LANL Xybion gates (TVC): 0.825 ms, 0.825 ms, 0.825 ms Viewing through CII/CIII beam-splitter. Good data on both cameras. See STRONG flow to the divertor, and strong fanning-action on the top view. On top view, plumes get weaker from scan to scan, possibly due to rising density. Similar result on side view. Next shot - probe in deeper. | |
| Sep 8 2000 04:36:47:437PM | 1000908024 | BFSP Injection of C2D4 16.1 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "deep" insertion of FSP (~ +3-5 mm, as LCFS pulls away from probe) NL04 = 1.2e20 PPPL Xybion gates (SVC): 0.515 ms, 0.515 ms, 0.515 ms LANL Xybion gates (TVC): 0.800 ms, 0.800 ms, 0.800 ms Viewing through CII/CIII beam-splitter. Good data. Top view is near saturation. Seem to see flow to the divertor, and little asymmetry (looks strongest on last scan). From side view, it looks like flow reversal, so we have to be careful about this. Very dispersed in this view ("wispy"), but good pixel values. Next shot - intermediate probe depth. | |
| Sep 8 2000 04:59:07:170PM | 1000908025 | BFSP Injection of C2D4 16.0 torr of C2D4 in FSP plenum FSP firing at 0.7, 0.9, 1.1 seconds NINJA timing: trigger: -1.0 sec, duration: 1.25 sec "medium" insertion of FSP (~ +9-11 mm, as LCFS pulls away from probe) NL04 = 1.2e20 PPPL Xybion gates (SVC): 0.525 ms, 0.525 ms, 0.525 ms LANL Xybion gates (TVC): 0.810 ms, 0.810 ms, 0.810 ms Viewing through CII/CIII beam-splitter. Great data! Some saturation on LANL camera, but small. Second and third scans exhibit flow to the divertor, and fanning-action/skewedness, but this is not so apparent in first scan. Not clear what changed in that time. Lots of data to chew on. End of run. | |
| Physics Operator Comments | |||
| Sep 8 2000 08:48:44:310AM | Earl Marmar | Engineering setup for 1000908: Overnight ECDC in D2, stopping 1-2 hours prior to the run. Run begins at 9:00 and ends at 17:00. Power system setup as on 1000907001 (0.8 MA, 5.3 T, LSN diverted) Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid ENABLED leave B-side upper as is Hybrid DISABLED 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 ------------------------------------------------------------------------------- Run plan for 1000908: MP 276 -- Transport Experiments in the Scrape-Off Layer during Ohmic L- and H-mode using Gas-Injection Plumes | |
| Sep 8 2000 08:50:25:920AM | Earl Marmar | coldstart CAMAC error, no Q Ran ccl remcam reran coldstart no errors; all matrices respond | |
| Sep 8 2000 09:27:36:840AM | 1000908001 | Earl Marmar | loaded from 1000907001 pasted in programming for RCUR, ZCUR, CLEARIN, RXL, ZXL, RXU, ZXU and NL04 from 1000517019 Argon enabled for first shot plasma outboard limited |
| Sep 8 2000 09:34:23:280AM | 1000908002 | Earl Marmar | change RCUR and CLEARIN to fix gaps lower nl04 prog to 0.9e20 TF current to -150kA in seg 2 plasma |
| Sep 8 2000 09:50:18:340AM | 1000908003 | Earl Marmar | no PCS changes plasma disrupt at 1.3 seconds (too elongated) |
| Sep 8 2000 10:06:52:890AM | 1000908004 | Earl Marmar | reduce outer gap, RCUR out by 3 mm plasma outer gap 1.6 cm |
| Sep 8 2000 10:44:07:763AM | 1000908005 | Earl Marmar | tweak RCUR after 1.2 seconds plasma |
| Sep 8 2000 10:44:20:873AM | 1000908006 | Earl Marmar | no PCS changes plasma |
| Sep 8 2000 11:00:46:670AM | 1000908007 | Earl Marmar | DNB enabled for this shot; should fire at 1.4 s reduce prepuff by 2 ms tweak rampdown shape plasma |
| Sep 8 2000 11:15:40:920AM | 1000908008 | Earl Marmar | add 2 msec back to prepuff plasma |
| Sep 8 2000 11:39:20:060AM | 1000908009 | Earl Marmar | add 10 ms to argon puff shape tweaks after 1.8 seconds plasma |
| Sep 8 2000 12:12:00:607PM | 1000908010 | Earl Marmar | RCUR tweaks after 1.2 seconds plasma |
| Sep 8 2000 12:12:23:687PM | 1000908011 | Earl Marmar | lower nl04 prog to 7.2e19 plasma |
| Sep 8 2000 12:44:10:530PM | 1000908012 | Earl Marmar | no PCS changes plasma |
| Sep 8 2000 12:45:25:233PM | 1000908013 | Earl Marmar | no PCS changes plasma |
| Sep 8 2000 01:28:11:937PM | 1000908014 | Earl Marmar | tweak seg 1 PG3 puff plasma |
| Sep 8 2000 01:28:48:687PM | 1000908015 | Earl Marmar | no PCS changes plasma silver doped killer pellet at 1.6 seconds -- disrupt |
| Sep 8 2000 01:50:37:250PM | 1000908016 | Earl Marmar | nl04 prog to 6e19 plasma density not as low as requested |
| Sep 8 2000 02:39:03:233PM | 1000908017 | Earl Marmar | reduce PG3 voltage prog in segment 2 reduce nl04 programming early in segment 2 plasma density still rising during shot |
| Sep 8 2000 02:39:35:060PM | 1000908018 | Earl Marmar | turn off NINJA helium puff plasma got constant density |
| Sep 8 2000 02:54:01:200PM | 1000908019 | Earl Marmar | nl04 prog to 5e19 reduce PG3 preprog voltage to 0 at .36 seconds plasma got the density as requested |
| Sep 8 2000 03:14:02:140PM | 1000908020 | Earl Marmar | no PCS changes fizzle |
| Sep 8 2000 03:32:07:140PM | 1000908021 | Earl Marmar | B_r offset increased by 0.5 mT plasma |
| Sep 8 2000 03:50:23:513PM | 1000908022 | Earl Marmar | nl04 prg to 1e20 plasma got ~9.2e20 |
| Sep 8 2000 04:21:25:623PM | 1000908023 | Earl Marmar | nl04 prog to 1.2e20 fiddle with rampdown (RCUR in farther) plasma |
| Sep 8 2000 04:37:28:560PM | 1000908024 | Earl Marmar | tweak ZXL during rampdown plasma better rampdown |
| Sep 8 2000 05:05:02:530PM | 1000908025 | Earl Marmar | no PCS changes plasma |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:03:32:170AM | Plasma | Ok | |
| 2 | 09:28:56:200AM | Plasma | Ok | |
| 3 | 09:43:13:090AM | Plasma | Ok | |
| 4 | 09:56:56:513AM | Plasma | Ok | |
| 5 | 10:15:51:450AM | Plasma | Ok | |
| 6 | 10:36:31:373AM | Plasma | Ok | |
| 7 | 10:53:31:060AM | Plasma | Ok | |
| 8 | 11:08:55:687AM | Plasma | Ok | |
| 9 | 11:28:17:140AM | Plasma | Ok | |
| 10 | 11:46:58:217AM | Plasma | Ok | |
| 11 | 12:06:11:437PM | Plasma | Ok | |
| 12 | 12:23:41:140PM | Plasma | Ok | |
| 13 | 12:43:37:700PM | Plasma | Ok | |
| 14 | 01:00:05:060PM | Plasma | Ok | |
| 15 | 01:22:16:403PM | Plasma | Ok | |
| 16 | 01:43:57:530PM | Plasma | Ok | |
| 17 | 02:04:44:500PM | Plasma | Ok | |
| 18 | 02:26:49:403PM | Plasma | Ok | |
| 19 | 02:47:36:640PM | Plasma | Ok | |
| 20 | 03:08:19:403PM | Plasma | Ok | |
| 21 | 03:24:15:780PM | Plasma | Ok | |
| 22 | 03:46:00:810PM | Plasma | Ok | |
| 23 | 04:06:29:937PM | Plasma | Ok | |
| 24 | 04:26:56:170PM | Plasma | Ok | |
| 25 | 04:46:11:093PM | Plasma | Ok | |