Miniproposals

Miniproposal: 104 Date Filed: 3/13/1995 Title: Investigation of plasma flows using gas injection plumes First Author: Bruce Lipschultz Session Leader: Gary McCracken (shots 1-37)

Miniproposal: 106 Date Filed: 3/23/1995 Title: Impurity Transport with Reversed Toroidal Field First Author: Gary McCracken Session Leader: Gary McCracken (shots 1-37)

Engineering Operator Run Comment

Granetz/mccracken

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:13:523PM

Author: To Be Determined

Session Leader Run Summary 950414 Engineering operator: F Silva/J Daigle Physics operator: R Granetz Session Leader: G McCracken Run for mini-proposals #104 and 106, Objectives: (1) Inject impurities at the inner wall and at the divertor with the NINJA system and observe the spatial spreading with the CCD cameras and filters from B-side and B-top. From these measurements, using models, deduce plasma flow. (2) Study impurity screening using CH_4, He and Ar in the reversed field configuration. A successful day. Most of the planned program was completed. CH4 was injected through the inner wall midplane capillary (B16-001) and the capillary just above the inner nose (B22-022) for most of the run. Successful measurements of the spatial distribution of CII, CIII, (or HeI and HeII) were made with both the B-side and B-top camera for most shots. Good signals were observed from the capillaries, B16-001 and B22-022. No carbon could be seen when attempting to inject through capillaries on the outer target or the private flux zone and these injections were abandoned after shot 14. The neutral species Halpha (shot 4) and HeI (shots 28 to 35) were pretty symmetric. The plumes from impurity ions, observed with the cameras, were almost always towards the divertor target, ie they reversed when the X-point was moved from lower to upper. Exceptions were that the plume reversed during current rampdown, when there was a very large CH4 injection (shots 9 and 10), and at high density (shots 15 and 16) Measurements were taken successfully with the Fast Scanning Probe under most conditions of density and impurity puffing and with both upper and lower X-point. This should allow us to extrapolate the ne and Te profile conditions to the positions where the impurities were puffed. There should also be some interesting data on plasma flow from the Mach probe. Good spectroscopic data were obtained for C and He with the McPherson and with the new Chromex spectrometer looking at four independent positions, K-port midplane, K-upper, K-lower and A-lower. HeI and HeII lines were obtained simultaneously and CII and CIII were also obtained simultaneously, depending on the impurity gas puffed. Results from the last 2 shots (36 and 37) were interesting. With a constant CH4 input from 0.5 to 0.9 s using the B-side upper piezo, the C density in the confined plasma reached a constant level which was proportional to the gas inflow rate. Shot summary: 001 Good shot: nl04=0.8e20 m^-2. No methane injected 002 Fizzle 003 Good shot. nel04=0.8e20 B-Top and B-side camera filters set on Halpha. No methane injected 004 Good shot: nel04=1.0e20; filters on Halpha. Methane injected from B16-001 at 0.5 s and B22-002, and B32-014 at 0.7 s.(Triggers at 0.3 and 0.5 s). Plenum pressure 10 psi. Shot disrupted at 0.7 s about the time of the second methane puff. 005 Fizzle 006 Good shot nl04=1e20 , filters reset on CII. : Methane injected from B16-001 only, trigger 0.3 s. Plenum pressure 10 psi. Clear CII puff on cameras with plume which actually reverses direction late in the shot. Something funny happens at 0.9 s Halpha and CII (C-port) both drop 007 Good shot: nl04=1e20, filters reset on CIII. Methane injected from B16-001 only, trigger 0.3 s. Plenum pressure 10 psi. Good CIII plume on B-side camera only. Plume reverses direction and there are various peculiar effects in the SOL. May be due to detachment on the inner target followed by reattachment. We seem to be seriously perturbing the SOL with the methane injection. 008 Good shot: nl04=1e20, filters set on CIII. Methane injected from B16-001. Plenum pressure lowered to 4.2 psi and left at this for subsequent shots. Good CIII plume on B-side. Lower intensity, but looks fine. 009 Good shot: nl04=1e20, filters set on CII. Methane injected from B16-001. Good CII plume, considerably brighter than CIII 010 Good shot: nl04=1e20; filters set on CII. Methane injected from B16-001 and B22-022 trigger 0.4 s, B26-019 at 0.6 s. Good plumes from B16-001 and B22-022, both going towards the divertor but with different angles wrt the midplane! No puff visible from the private flux zone 011 Good shot: nl04=1e20; filters again set on CIII. Methane injected from B16-001 and B22-022 trigger 0.4 s. B31-086 at 0.6 s. Reasonable CIII plumes from B16-001. B22-022 is very faint but just visible, No puff visible from the private flux zone 012 Good shot: nl04=0.6e20; filters again set on CIII. Methane injected from B16-001 and B22-022 trigger 0.4 s. No puff in outer SOL . Quite bright plume on B16-001, less bright but not bad on B22-022. Looks like there is a bit more diffusion of the CII upstream than at higher density. Disruption just after 1.0 s 013 Good shot: nl04=0.6e20; filters reset to CII Methane injected from B16-001 and B22-022 trigger 0.4 s. Good plumes in both B-side and B-top cameras 014 Good shot: nl04=0.6e20; filters set to CII . Change NINJA valves; methane injected from B31-086 and B32-014 trigger at 0.4 s and B26-019 at 0.6 s. Attempt to see if we can see anything from the private flux zone or the outer SOL. Possibly something very faint in the PFZ, but nothing at the outer SOL NINJA valvesB16-001 and B22-022 at inner wall used on all subsequent shots up to #035, triggered at 0.4 s (except #016). 015 Good shot: nl04=1.5e20; Filters set to CII. Flow now observed away from the divertor. Both plumes at the same angle. 016 Good shot: nl04=1.5e20. Filters reset to CIII . Delay trigger to 0.5 s. so that density is constant before injection. Very faint CIII plume away from the target 017 Good shot: nl04= 0.8e20 to 1.3e20,density scan. Filters reset to CII. Both plumes towards the divertor all through the shot except after Ip rundown Move to Phase 3 of program with X-point at the top: 018 Good shot: nl04=1.0e20. Filters set to CII. . Flow towards the upper divertor as expected. 019 Good shot: nl04= 1.0e20. Filters reset to CIII. NINJA valves disabled for a spectroscopic background. 020 Good shot: nl04=1.0e20 Filters set to CIII, CH4 injection. CIII plume clearly towards the upper target though rather faint 021 Repeat shot: filters set to CIII nl04=1.0e20 Good repeat of CIII plume 022 Good shot: nl04= 0.6e20. Filters set to CIII.. Nice CIII plume towards the upper target 023 Good shot: nl04=0.6e20. Filters reset to CII. Good CII plume towards the upper target 024 Good shot nl04=0.6e20. Filters set to CII . Repeat to get the scanning probe into the LCFS. Nice repeat of CII plume 025 Good shot; nl04=1.4e20. Filters set to CII. CII plume still to the upper X-point 026 nl04=1.4e20.Filters set to CIII. Disrupted early -- at 0.3 s 027 Good shot; nl04=1.4e20. Filters set to CIII. CIII plume rather faint but definitely towards the upper target. Last shot with CH4 injection from the NINJA system 028 Change to Helium injection. Good shot; nl04=1.4e20. filters reset to HeI. NINJA plenum pressure 9.5 psi Lovely bright symmetric HeI blob. No significant plume 029 Good shot; nl04=1.0e20. B-side filter reset to HeII, B-top still on HeI. Very faint but visible HeII plume on the B-side camera, still symmetric blob on the B-top HeI Change back to X-point at the bottom. 030 Good shot; nl04=1.0e20 B-side filter HeII and B-top on HeI. HeII has changed direction and is flowing back to the lower divertor. Faint but visible plume. 031 Good shot; nl04=1.0e20. B-side and B-top filter on HeI. HeI blob nicely symmetrical 032 Good shot; nl04=0.6e20 (nominal) but helium fuelling pushes it up to 1e20. B-side and B-top filter on HeI. Again nicely symmetric HeI 033 Good shot; nl04=0.6e20.(nominal) Helium fuelling pushes it up to 1e20. B-side filter set to HeII. B-top on HeI. HeII on B-side very faint but definite plume towards the bottom 034 Good shot; nl04=1.4e20. B-side filter HeII. B-top on HeI. HeII plume there but faint; similar to intensity at lower density. Disruption at 0.98 s 035 Good shot; nl04=1.4e20. B-side and B-top filter on HeI. HeI looks very faint. Not sure about the symmetry 036 NINJA was disabled and CH4 was puffed through B-side upper piezo from 0.5 to 0.9 s. Plenum pressure 3.1 psi. Filters set to CII. Good shot, nl04= 1.0e20. Clear increase of CII (C Port) and on the McPherson. The carbon level in both cases comes to an equilibrium level and then decays in about 100 ms after the CH4 is turned off. 037 CH4 again puffed through B-side upper from 0.5 to 0.9 s. Plenum pressure increased to 8.4 psi, filters set to CII. Good shot; nl04= 1.0e20. Again a clear increase on CII (C Port) and on the McPherson. The carbon level reaches an equilibrium level about 3 times greater than the previous shot, ie proportional to the plenum pressure. There was also an increase in the general background radiation on the inner wall as seen on the B-side camera

Physics Operator Summaries

Entered: Jul 7 2004 04:36:53:863PM

Author: To Be Determined

Run plan for 950414: MP's 104 and 106: Investigation of plasma flows using gas injection plumes & Impurity transport with reversed toroidal field. SL: G. McCracken PO: R. Granetz EO: F. Silva/J. Paranay/J. Daigle From the PO's standpoint, this run required operation of both lower and upper single null plasmas at multiple densities with methane and helium puffing from multiple NINJA locations, as well as methane puffing from the B-side upper valve. The fast scanning probe was also being used on most shots. Although the busy run plan schedule was overly optimistic, we actually completed virtually all of it. The first five shots (which included the only two fizzles of the day) were required to setup the proper lower x-point configuration, and from then on the machine ran extremely well, with most shots ramping all the way down. Switching to a good upper x-point plasma was trouble-free (although one shot was required to fine tune gaps, etc.) Returning to lower x-point nulls was also trouble-free. The only problems encountered during this run were: -- On two shots (01 and 12) the EFC chopper supply averaged only 600-700 amps, instead of its nominal 1500 amps, due to reduced voltage. This resulted in a VDE in both cases. The reason for this behavior is a mystery. The engineers raised the PLC voltage limit from 700 to 900 volts, and the problem did not re-occur. -- There was a water leak in the cell (from the cooling line of a pump on the PCX diagnostic), which caused a half-hour pause in the run while we went into the cell to investigate. Despite a significant rainfall on the Edge and RF cabinets below the PCX, no damage was done and the run continued without further incident. -- Plasmas with densities of nl_04 > 1.4e20 m-2 still result in VDE disruptions due to railing the voltage limits on the EF1's. I made no attempt to mitigate this problem, since it was occurring late enough in the shot that we still got the data we needed. Scorecord: 35 plasmas (23 ramped all the way down) 2 fizzles Obscure details follow: Set up engineering as for shot 950413025. Set pre-fill at 2.3e-5 torr deuterium. Normal discharge cleaning prior to run, in deuterium. A-side plenum at 19 psi of deuterium. B-side lower plenum at 4 psi of argon, but DISABLED at start of run. B-side upper plenum at 3 psi of methane, but DISABLED at start of run NINJA plenum at 10 psi of methane, but DISABLED at start of run. After the first good plasma shot, make the following adjustments: Lower ZCUR from 0 to -1.5 cm so that the strike point is between probes 2 & 3. Set density at a constant value of nl_04=1.0e20 m-2. Maybe increase inner and outer gaps a bit?? Establish good plasmas, then begin the run program, which consists of various combinations of puffing in argon, methane, and helium using NINJA and B-side values at several times during the shot, and at several densities. Also, try a subset of these experiments with an upper x-point plasma. For a template, use shot 950411041, except lower ZCUR to the midplane (or below), and possibly turn on EF2-by-EF4 gain and adjust IC_EF4 gain. (See the values in segment 2.) Shot 01 -- Plasma, some hard x-rays, disrupted at 1.03 s. EFC's average current was only 700 amps, instead of 1500 amps. This resulted in the VDE. It looks like EFC's voltage is not as high as it should be. Engineers are looking at the problem. Next shot: increase pre-fill to 2.5e-5 torr. Shot 02 -- Fizzle. Next shot: pre-fill at 2.4e-5, repeat. Slight tweak made to EF4 (decrease by 15 amps in segment 01). Shot 03 -- Plasma, nice shot. Ramped all the way down. nl_04=0.8e20 m-2. Plasma has ZCUR centered, which doesn't put the strike point at the desired position. Next shot: increase nl_04=1.0e20 m-2, lower ZCUR by 1 cm, and lower the FSP point by 1 cm. Enable NINJA methane puff from the inboard midplane. Shot 04 -- Plasma, disrupted at 0.70 s. EF2's railed at 4 kA. The NINJA puff caused the density to increase dramatically, possibly leading to the increased loop voltage, and the EF2 saturation. Plasma ZCUR did move down to -1 cm. FSP position was too low. Plasma shape looked pretty weird starting at about 0.56 s. Next shot: raise FSP point up by 1 cm (back to where it was), and reduce the number of NINJA puffs. Shot 05 -- Fizzle. Next shot: repeat. Shot 06 -- Plasma. Ramped all the way down. Strange "re-attachment" behavior at t=0.88 s. Gaps are 1.6-1.7 cm, SSEP=1.3 cm. nl_04=1.0e20 m-2, but it drops at the "reattachment". Strike point is still too high. Next shot: Drop ZXL by 1 cm, and program FSP for constant value (rather than the slight ramp this was inherited from yesterday). Shot 07 -- Plasma. Ramped all the way down. Again, there's a strange "re-attachment" phenomenon. Density feedback is struggling because of it. FSP control was much better, but strike point is still high. Next shot: tweak FSP down 2-3 mm. Lower the NINJA plenum pressure from 10 to 5 psi. Shot 08 -- Plasma. Ramped all the way down. No "re-attachment" phenomenon on this shot. Maybe it was the reduced methane pressure. FSP control is excellent. Strike point still too high on outer divertor, but fixing the FSP position and ZCUR takes away nearly any flexibility in controlling the ZXL. Next shot: enable fast scanning probe, change spectroscopy lines. Shot 09 -- Plasma. Ramped all the way down. Scandium injected at 0.8 s. Next shot: NINJA puffs from multiple locations at multiple times. Shot 10 -- Plasma. Ramped all the way down. Great carbon plumes. Scandium injected at 0.8 s (until further notice). Next shot: some NINJA changes, and switch spectrometer from CII to CIII. Shot 11 -- Plasma. Ramped all the way down. Good plume data. Next shot: lower density from nl_04=1.0 to 0.6e20 m-2. Shot 12 -- Plasma, disrupted at 1.03 s. EFC was not giving enough voltage, resulting in an average current of 600-700 amps. This leads to the VDE. (Same problem as on shot 01.) Next shot: change from CIII to CII Shot 13 -- Plasma. Ramped all the way down. nl_04=0.6e20 m-2. Good plume data. Next shot: change NINJA puff positions. Thermocouple on upper TF arm is stuck at -156 C. Take next shot anyway. Shot 14 -- Plasma. Ramped all the way down. Good data. Next shot: raise density to nl_04=1.5e20 m-2. Change NINJA puff positions. Shot 15 -- Plasma, disrupted at 0.93 s. nl_04=1.5e20 m-2, as requested. The VDE was caused by EF1's hitting their voltage limits very hard. Next shot: repeat (since we don't know of a good way of getting around the EF1 voltage limits). Shot 16 -- Plasma, disrupted at 0.94 s. Same as the previous shot. Next shot: program in density ramp starting at 0.8e20 at 0.4 s, and ramping up to 1.3e20 at 0.95 s. Shot 17 -- Plasma. Ramped almost all the way down. Good plume data. Next shot: CHANGE TO UPPER X-POINT, with nl_04=1.0e20 m-2. Shot 18 -- Plasma. Ramped all the way down. nl_04=1.0e20 m-2. Succeeded in getting an upper x-point with midplane-centered plasma, but it was almost double null, and the gaps were less than 1.5 cm. Next shot: Move lower x-point down by 1.5 cm and out by 1.0 cm, and increase CLEARIN by 0.5 cm. Shot 19 -- Plasma. Ramped all the way down. Good upper x-point (not double null). FSP point is moving several mm, but might be acceptable. Next shot: repeat, with NINJA methane puffing turned on, and with scanning probe enabled. Shot 20 -- Plasma. Ramped all the way down. Good upper x-point. Good plume data. Scanning probe worked okay, but its camac hung up. Next shot: repeat. There's a water leak in the cell. It's the PCX cooling. About a 45 min. hold. Shot 21 -- Plasma. Ramped all the way down. Good FSP data. Next shot: lower the density from nl_04=1.0 to 0.6e20 m-2. Shot 22 -- Plasma. Ramped all the way down. Good plume data. nl_04=0.6e20 m-2. Next shot: enable fast scanning probe Shot 23 -- Plasma. Ramped all the way down. Good plume data. FSP only got in to 3 mm from separatrix. Need a repeat for better data. Next shot: repeat, for better FSP data. Shot 24 -- Plasma, minor disruption at 1.18 s, major disruption at 1.28 s. Next shot: raise density from nl_04=0.6 to 1.4e20 m-2. Shot 25 -- Plasma, disrupted at 1.18 s. NL_04=1.4e20 m-2, as requested. Good plume data. Next shot: repeat, with scanning probe enabled. Shot 26 -- Disrupted at 0.31 s, around the time of crossover. Next shot: repeat. Shot 27 -- Plasma, disrupted at 1.18 s. NL_04=1.4e20 m-2. This was the last shot with methane puffing from the NINJA system. Next shot: puff helium from the NINJA system. Set density at nl_04=1.0e20 m-2. Still upper x-point. Switch spectrometers to helium lines. Shot 28 -- Plasma. Ramped all the way down. Good puff data (no plumes seen in neutral helium emission, as expected). The density went a little higher than requested, possibly due to the helium injection. Next shot: repeat, with fast scanning probe enabled. Shot 29 -- Plasma, disrupted at 1.18 s. Helium plumes seen. Scanning probe data okay. This was the last upper x-point plasma with helium puffing. Next shot: go back to lower x-point plasmas, with NINJA helium puffing, at nl_04=1.0e20 m-2. This is programmed by reloading segment 2 from shot 10 earlier today. Remember to manually turn on segment 2 and turn off segment 3. Shot 30 -- Plasma. Ramped all the way down. Good plume data in HeII. Helium puffing tends to make the density surpass the requested value. Next shot: repeat, with fast scanning probe. Shot 31 -- Plasma. Ramped all the way down. Good HeI data. Fast scanning probe fired. Next shot: decrease density to nl_04=0.6e20 m-2. I have to leave. Steve Wolfe is taking over as the physics operator for the last hour. Shot 32 -- Plasma. Ramped all the way down. Symmetric HeI plumes. Got 1.e20 on density, fueled with He. Next shot: repeat with He II filters. Shot 33 -- Plasma. Ramped all the way down. Good plume data. Next shot: raise density to nl_04=1.4e20 m-2. Shot 34 -- Plasma, disrupted at 0.95 s. NL04 at 1.4e20. He II filter. Next shot: repeat with He I filter. Shot 35 -- Plasma, disrupted at about the same time as the previous shot. NL04 at 1.4e20. He I filter. Next shot: reduce density back to nl_04=1.0e20 m-2, and puff CH4 from B-side upper. The gas puff is programmed from t=0.5 to 0.9 s. The plenum is at 3 psi. (Disable NINJA for this final set of shots.) Shot 36 -- Plasma. Ramped all the way down. NL_04 right on target (1.0e20). Next shot: repeat with B-side upper plenum raised to 8.4 psi of CH4. Shot 37 -- Plasma. Ramped all the way down. Everything looks good Divertor shows no sign of detachment. End of run.

Session Leader Comments
Apr 14 1995 08:21:04:740AM		Gary McCracken	Engineering operator: F Silva Physics operator R Granetz Session Leader G. McCracken This run is for mini-proposals #104 and 106, Purpose: (1)Inject impurities at the inner wall and at the divertor with the NINJA system and observe the spatial spreading with the CCD cameras and filters from B-side and B-top. From these measurements, using models, deduce plasma flow. (2)Study impurity screening using CH_4, He and Ar in the reversed field configuration.
Apr 14 1995 05:47:03:690PM		Gary McCracken	A successful day. Most of the planned program was completed. Injected CH4 through the inner wall midplane capillary (B16-001) and the capillary just above the inner nose (B22-022) for most of the run. No carbon could be seen when attempting to inject through capilarries on the outer target or the private flux zone.
Apr 14 1995 08:45:09:540AM	950414001	Gary McCracken	No methane injected
Apr 14 1995 08:46:21:370AM	950414001	Gary McCracken	No methane injected
Apr 14 1995 08:52:30:350AM	950414001	Gary McCracken	No methane injected
Apr 14 1995 08:58:52:150AM	950414002	Gary McCracken	B-Top and B-side camera filters set on CII (w1f4,w2f4). No methane injected
Apr 14 1995 09:11:57:310AM	950414003	Gary McCracken	Good shot. nel04=0.8e20 B-Top and B-side camera filters set on CII (w1f4,w2f4). No methane injected
Apr 14 1995 09:37:58:310AM	950414004	Gary McCracken	nel04=1.0e20 B-Top and B-side camera filters set on CII (w1f4,w2f4). Methane injected from B16-001,at 0.5 s and B22-002, and B32-014 at 0.7 s. (Triggers at 0.3 and 0.5 s.)Plenum pressure 10 psi Shot disrupted at 0.7 s about the time of the second methane puff. Also it looks as if the camera filters are still on H alpha. Perhaps they have not changed Will use only one puff in the next shot
Apr 14 1995 09:41:33:200AM	950414005	Gary McCracken	B-Top and B-side camera filters reset on CII (w1f4,w2f4) by J Terry. Methane injected from B16-001, only, trigger 0.3 s. Plenum pressure 10 psi Fizzle
Apr 14 1995 09:59:09:740AM	950414006	Gary McCracken	Good shot.B-Top and B-side camera filters reset on CII (w1f4,w2f4) by J Terry. nl04=1e20 Methane injected from B16-001, only, trigger 0.3 s. Plenum pressure 10 psi Clear CII puff on cameras with plume which actually reverses direction late in the shot. Something funny is happening at 0.9 s Halpha and CII (C-port) both drop Found out that filters were not changed on shot 4 due to error in using filter changer from Leader. Now sorted
Apr 14 1995 10:11:49:700AM	950414007	Gary McCracken	.B-Top and B-side camera filters reset on CIII (w1f6,w2f6). nl04=1e20 Methane injected from B16-001, only, trigger 0.3 s. Plenum pressure 10 psi Good CIII plume on B-side only (B-top did not see anything on previous shot either because it cannot see midplane) Plume reverses direction and there are various peculiar effects in the SOL. We seem to be seriouly perturbing the SOL with the methane. Will lower plenum pressure to 4.2 psi in the next pulse
Apr 14 1995 10:32:10:750AM	950414008	Gary McCracken	.B-Top and B-side camera filters set on CIII (w1f6,w2f6). nl04=1e20 Methane injected from B16-001, only, trigger 0.3 s. Plenum pressure lowered 4.2 psi Good CIII plume on B-side . Lower intensity, but looks fine Brian thinks that the funny effects in the previous 2 discharges were due to detachment on the inner target followed by reattachment towards the end of the shot when the methane puls reduces.
Apr 14 1995 10:40:03:610AM	950414009	Gary McCracken	.B-Top and B-side camera filters set on CII (w1f4,w2f4). nl04=1e20 Methane injected from B16-001, only, trigger 0.3 s. Plenum pressure 4.2 psi Good CII plume, considerably brighter than CIII
Apr 14 1995 10:54:23:230AM	950414010	Gary McCracken	.B-Top and B-side camera filters set on CII (w1f4,w2f4). nl04=1e20 Methane injected from B16-001 and B22-022 trigger 0.4 s. Plenum pressure 4.2 psi B26-019 at 0.6 s. Good plumes from B16-001 and B22-022, both going towards the divertor but with different angles wrt the midplane! No puff visible from the private flux zone
Apr 14 1995 11:06:09:660AM	950414011	Gary McCracken	B-Top and B-side camera filters again set on CIII (w1f6,w2f6). nl04=1e20 Methane injected from B16-001 and B22-022 trigger 0.4 s. Plenum pressure 4.2 psi B31-086 at 0.6 s. Reasonable CIII plumes from B16-001. B22-022 is very faint but just visible, No puff visible from the private flux zone
Apr 14 1995 11:15:52:120AM	950414012	Gary McCracken	B-Top and B-side camera filters again set on CIII (w1f6,w2f6). Lowered density to nl04=0.6e20 Methane injected from B16-001 and B22-022 trigger 0.4 s. Plenum pressure 4.2 psi No puff in outer SOL . Quite bright plume on B16-001, less bright but not bad on B22-022. Looks like there is a bit more diffusion of the CII upstream than at higher density. Disruption just after 1.0 s
Apr 14 1995 11:30:58:910AM	950414013	Gary McCracken	B-Top and B-side camera filters reset to CII (w1f4,w2f4). Density nl04=0.6e20 Methane injected from B16-001 and B22-022 trigger 0.4 s. Plenum pressure 4.2 psi Good plumes in both B-side and B-top cameras
Apr 14 1995 11:44:18:980AM	950414014	Gary McCracken	B-Top and B-side camera filters set to CII (w1f4,w2f4). Density nl04=0.6e20 Change NINJA valves; methane injected from B31-086 and B32-014 trigger at 0.4 s and B26-019 at 0.6 s. Attempt to see if we can see anything from the private flux zone or the outer SOL. Plenum pressure 4.2 psi Possibly something very faint in the PFZ, but nothing at the outer SOL
Apr 14 1995 12:02:43:240PM	950414015	Gary McCracken	B-Top and B-side camera filters set to CII (w1f4,w2f4). Density increased to nl04=1.5e20 Change NINJA valves; back to B16-001 and B22-022 at inner wall, triggered at 0.4 s. Flow now observed away from the divertor. Both puffing points at the same angle.
Apr 14 1995 12:22:02:770PM	950414016	Gary McCracken	B-Top and B-side camera filters reset to CIII (w1f6,w2f6). Density nl04=1.5e20 NINJA valves; B16-001 and B22-022 at inner wall, delay trigger to 0.5 s. so that density is constant. Very faint CIII plume away from the target
Apr 14 1995 12:32:32:560PM	950414017	Gary McCracken	B-Top and B-side camera filters reset to CII (w1f4,w2f4). Density scan nl04 from 0.8e20 to 1.3e20 NINJA valves; B16-001 and B22-022 at inner wall, trigger back to 0.4 s. Both plumes towards the divertor all through the shot except after Ip rundown
Apr 14 1995 12:43:48:280PM	950414018	Gary McCracken	Move to Phase 3 of program with X-point at the top Apparently it worked well. Congratulations to Phys Op B-Top and B-side camera filters set to CII (w1f4,w2f4). Density constant at 1.0e20 NINJA valves; B16-001 and B22-022 at inner wall, trigger at 0.4 s. Flow towards the upper divertor as expected.
Apr 14 1995 12:58:20:010PM	950414019	Gary McCracken	X-point at the top B-Top and B-side camera filters reset to CIII (w1f6,w2f6). Density constant at 1.0e20 NINJA valves disabled for a spectroscopic background Good shot
Apr 14 1995 01:16:03:060PM	950414020	Gary McCracken	X-point at the top B-Top and B-side camera filters set to CIII (w1f6,w2f6). Density constant at 1.0e20 NINJA valves B16-001 and B22-022 triggered at o.4 s Good shot. CIII plume clearly towards the upper target though rather faint
Apr 14 1995 01:45:51:730PM	950414021	Gary McCracken	Program held up because of water leak in the cell. Identified as being in the Neutral particle analyser. Repeat shot of 950414020. X-point at the top B-Top and B-side camera filters set to CIII (w1f6,w2f6). Density constant at 1.0e20 NINJA valves B16-001 and B22-022 triggered at o.4 s Good repeat of CIII plume
Apr 14 1995 01:49:07:450PM	950414021	Gary McCracken	Program held up because of water leak in the cell. Identified as being in the Neutral particle analyser. Repeat shot of 950414020. X-point at the top B-Top and B-side camera filters set to CIII (w1f6,w2f6). Density constant at 1.0e20 NINJA valves B16-001 and B22-022 triggered at o.4 s Good repeat of CIII plume
Apr 14 1995 01:57:17:710PM	950414022	Gary McCracken	X-point at the top B-Top and B-side camera filters set to CIII (w1f6,w2f6). Density reduced to 0.6e20 NINJA valves B16-001 and B22-022 triggered at o.4 s Nice CIII plume towards the upper target
Apr 14 1995 02:06:49:270PM	950414023	Gary McCracken	X-point at the top B-Top and B-side camera filters reset to CII (w1f4,w2f4). Density nl04=0.6e20 NINJA valves B16-001 and B22-022 triggered at 0.4 s Good CII plume towards the upper X-point
Apr 14 1995 02:21:18:140PM	950414024	Gary McCracken	X-point at the top B-Top and B-side camera filters set to CII (w1f4,w2f4). Density 0.6e20 NINJA valves B16-001 and B22-022 triggered at 0.4 s Repeat to get the scanning probe into the LCFS Nice repeat of CII plume
Apr 14 1995 02:31:57:670PM	950414025	Gary McCracken	X-point at the top B-Top and B-side camera filters set to CII (w1f4,w2f4). Density increased to 1.4e20 NINJA valves B16-001 and B22-022 triggered at 0.4 s Good shot; CII plume still to the upper X-point
Apr 14 1995 02:47:06:620PM	950414026	Gary McCracken	X-point at the top B-Top and B-side camera filters set to CIII (w1f6,w2f6). Density 1.4e20 NINJA valves B16-001 and B22-022 triggered at 0.4 s Disrupted early at 0.3 s
Apr 14 1995 03:02:26:370PM	950414027	Gary McCracken	X-point at the top B-Top and B-side camera filters set to CIII (w1f6,w2f6). Density 1.4e20 NINJA valves B16-001 and B22-022 triggered at 0.4 s CIII plume rather faint but definitely towards the upper target. FSP should have been in to the LCFS. This is the last shot with CH4 injection from the NINJA system
Apr 14 1995 03:17:53:960PM	950414028	Gary McCracken	X-point at the top; Change to Helium injection B-Top and B-side camera filters reset to HeI (w1f2,w2f2). Density reduced to 1.0e20 NINJA valves B16-001 and B22-022 triggered at 0.4 s NINJA plenum pressure 9.5 psi Good shot and a lovely bright symmetric HeI blob. No significant plume
Apr 14 1995 03:28:54:140PM	950414029	Gary McCracken	X-point at the top; Change to Helium injection B-side camera filter reset to HeII (w2f3). B-top still on HeI as there is no HeII filter in this changer Density 1.0e20 NINJA valves B16-001 and B22-022 triggered at 0.4 s NINJA plenum pressure 9.5 psi Very faint but visible HeII plume on the B-side camera, still symmetric blob on the B-top HeI view.
Apr 14 1995 03:39:52:960PM	950414030	Gary McCracken	Change back to X-point at the bottom, repeat shot 10; Helium injection B-side camera filter reset to HeII (w2f3). B-top still on HeI as there is no HeII filter in this changer Density 1.0e20 NINJA valves B16-001 and B22-022 triggered at 0.4 s NINJA plenum pressure 9.5 psi HeII has changed direction and is flowing back to the lower divertor Faint but visible plume.
Apr 14 1995 03:50:24:150PM	950414031	Gary McCracken	X-point at the bottom; Helium injection B-side camera filter reset to HeI (w2f2). B-top on HeI Density 1.0e20 NINJA valves B16-001 and B22-022 triggered at 0.4 s NINJA plenum pressure 9.5 psi Good shot: HeI blob nicely symmetrical
Apr 14 1995 04:03:08:920PM	950414032	Gary McCracken	X-point at the bottom; Helium injection B-side camera filter set to HeI (w2f2). B-top on HeI Density intended to be 0.6e20 but Helium fuelling pushes it up to 1e20 NINJA valves B16-001 and B22-022 triggered at 0.4 s NINJA plenum pressure 9.5 psi Nice shot; again nicely symmetric HeI
Apr 14 1995 04:16:56:990PM	950414033	Gary McCracken	X-point at the bottom; Helium injection B-side camera filter set to HeII (w2f3). B-top on HeI Density intended to be 0.6e20 but Helium fuelling pushes it up to 1e20 NINJA valves B16-001 and B22-022 triggered at 0.4 s NINJA plenum pressure 9.5 psi HeII on B-side very faint but definite plume towards the bottom
Apr 14 1995 04:29:58:580PM	950414034	Gary McCracken	X-point at the bottom; Helium injection B-side camera filter HeII (w2f3). B-top on HeI Density nl04= 1.4e20 NINJA valves B16-001 and B22-022 triggered at 0.4 s NINJA plenum pressure 9.5 psi HEII plume there but faint;similar to intensity at lower density. Disruption at 0.98 s
Apr 14 1995 04:47:46:700PM	950414035	Gary McCracken	X-point at the bottom; Helium injection B-side camera filter reset to HeI (w2f2). B-top on HeI Density nl04= 1.4e20 NINJA valves B16-001 and B22-022 triggered at 0.4 s NINJA plenum pressure 9.5 psi HeI looks very faint. Not sure about the symmetry
Apr 14 1995 05:31:12:400PM	950414036	Gary McCracken	NINJA was disabled and CH4 was puffed through B-side upper from 0.5 to 0.9 s Plenum pressure 3.1 psi X-point at the bottom; B-side and B-top camera filters set to CII (w2f4). Density nl04= 1.0e20 Good shot; clear increase on CII (C Port) and on the McPherson. The carbon level in both cases comes to an equilibrium level and then deacys in about 100 ms after the CH4 is turned off
Apr 14 1995 05:35:15:200PM	950414037	Gary McCracken	CH4 was again puffed through B-side upper from 0.5 to 0.9 s Plenum pressure increased to 8.4 psi X-point at the bottom; B-side and B-top camera filters set to CII (w2f4). Density nl04= 1.0e20 Good shot; again a clear increase on CII (C Port) and on the McPherson. The carbon level reaches an equilibrium level about 3 times greater than the previous shot, ie proportional to the plenum pressure. There was also an increase in the general background radiation on the inner wall as seen on the B-side camera
Apr 14 1995 05:54:14:670PM	950414037	Gary McCracken	1. Lower X-point nl04= 0.6,1.0,1.5e20, CH4injected, CII and CIII filters 2. Upper X-point nl04= 0.6,1.0,1.5e20, CH4injected, CII and CIII filters 3. Upper X-point nl04= 1.0e20, He injected, HeI and HeII filters 4. Lower X-point nl04= 0.6,1.0, 1.4e20, He injected, HeI and HeII filters 5. Lower X-point nl04=1e20, CH4 injected through B-side upper piezo valve from 0.5 to 0.9 s with plenum pressure at 3.1 and 8.4 psi

Physics Operator Comments
Apr 14 1995 07:58:44:740AM		Robert Granetz	Run plan for 950414: MP's 104 and 106: Investigation of plasma flows using gas injection plumes & Impurity transport with reversed toroidal field. SL: G. McCracken PO: R. Granetz EO: F. Silva/J. Daigle Set up engineering as for shot 950413025. Set pre-fill at 2.3e-5 torr deuterium. Normal discharge cleaning prior to run, in deuterium. A-side plenum at 19 psi of deuterium. B-side lower plenum at 4 psi of argon, but DISABLED at start of run. B-side upper plenum at 3 psi of methane, but DISABLED at start of run NINJA plenum at 10 psi of methane, but DISABLED at start of run. After the first good plasma shot, make the following adjustments: Lower ZCUR from 0 to -1.5 cm so that the strike point is between probes 2 & 3. Set density at a constant value of nl_04=1.0e20 m-2. Maybe increase inner and outer gaps a bit??
Apr 14 1995 08:00:39:040AM		Robert Granetz	Establish good plasmas, then begin the run program, which consists of various combinations of puffing in argon, methane, and helium using NINJA and B-side values at several times during the shot, and at several densities. Also, try a subset of these experiments with an upper x-point plasma. For a template, use shot 950411041, except lower ZCUR to the midplane (or below), and possibly turn on EF2-by-EF4 gain and adjust IC_EF4 gain. (See the values in segment 2.)
Apr 14 1995 08:49:56:710AM	950414001	Robert Granetz	Shot 01 -- Plasma, some hard x-rays, disrupted at 1.03 s. EFC's average current was only 700 amps, instead of 1500 amps. This resulted in the VDE. It looks like EFC's voltage is not as high as it should be. Next shot: increase pre-fill to 2.5e-5 torr.
Apr 14 1995 08:57:17:500AM	950414002	Robert Granetz	Shot 02 -- Fizzle. Next shot: pre-fill at 2.4e-5, repeat
Apr 14 1995 09:19:32:610AM	950414003	Robert Granetz	Shot 03 -- Plasma, nice shot. Ramped all the way down. nl_04=0.8e20 m-2. Plasma has ZCUR centered, which doesn't put the strike point at the desired position. Next shot: increase nl_04=1.0e20 m-2, lower ZCUR by 1 cm, and lower the FSP point by 1 cm.
Apr 14 1995 09:35:43:100AM	950414004	Robert Granetz	Shot 04 -- Plasma, disrupted at 0.70 s. EF2's railed at 4 kA. The NINJA puff caused the density to increase dramatically, possibly leading to the increased loop voltage, and the EF2 saturation. Plasma ZCUR did move down to -1 cm. FSP position was too low. Plasma shape looked pretty weird starting at about 0.56 s. Next shot: raise FSP point up by 1 cm (back to where it was), and reduce the number of NINJA puffs.
Apr 14 1995 10:03:34:220AM	950414005	Robert Granetz	Shot 05 -- Fizzle. Next shot: repeat.
Apr 14 1995 10:04:07:130AM	950414006	Robert Granetz	Shot 06 -- Plasma. Ramped all the way down. Strange "re-attachment" behavior at t=0.88 s. Gaps are 1.6-1.7 cm, SSEP=1.3 cm. nl_04=1.0e20 m-2, but it drops at the "reattachment". Strike point is still too high. Next shot: Drop ZXL by 1 cm, and program FSP for constant value (rather than the slight ramp this was inherited from yesterday).
Apr 14 1995 10:17:58:780AM	950414007	Robert Granetz	Shot 07 -- Plasma. Ramped all the way down. Again, there's a strange "re-attachment" phenomenon. Density feedback is struggling because of it. FSP control was much better, but strike point is still high. Next shot: tweak FSP down 2-3 mm. Lower the NINJA plenum pressure from 10 to 5 psi.
Apr 14 1995 10:31:55:520AM	950414008	Robert Granetz	Shot 08 -- Plasma. Ramped all the way down. No "re-attachment" phenomenon on this shot. Maybe it was the reduced methane pressure. FSP control is excellent. Strike point still too high on outer divertor, but fixing the FSP position and ZCUR takes away nearly any flexibility in controlling the ZXL. Next shot: enable fast scanning probe, change spectroscopy lines.
Apr 14 1995 10:40:12:650AM	950414009	Robert Granetz	Shot 09 -- Plasma. Ramped all the way down. Next shot: NINJA puffs from multiple locations at multiple times.
Apr 14 1995 10:51:49:370AM	950414010	Robert Granetz	Shot 10 -- Plasma. Ramped al the way down. Great carbon plumes. Next shot: some NINJA changes, and switch spectrometer from CII to CIII.
Apr 14 1995 11:02:30:910AM	950414011	Robert Granetz	Shot 11 -- Plasma. Ramped all the way down. Good plume data. Next shot: lower density from nl_04=1.0 to 0.6e20 m-2.
Apr 14 1995 11:18:53:370AM	950414012	Robert Granetz	Shot 12 -- Plasma, disrupted at 1.03 s. EFC was not giving enough voltage, resulting in an average current of 600-700 amps. This leads to the VDE. (Same problem as on shot 01.) Next shot: change from CIII to CI
Apr 14 1995 11:29:02:490AM	950414013	Robert Granetz	Shot 13 -- Plasma. Ramped all the way down. nl_04=0.6e20 m-2. Good plume data. Next shot: change NINJA puff positions.
Apr 14 1995 11:43:59:340AM	950414014	Robert Granetz	Shot 14 -- Plasma. Ramped all the way down. Good data. Next shot: raise density to nl_04=1.5e20 m-2. Change NINJA puff positions.
Apr 14 1995 12:10:41:990PM	950414015	Robert Granetz	Shot 15 -- Plasma, disrupted at 0.93 s. nl_04=1.5e20 m-2, as requested. The VDE was caused by EF1's hitting their voltage limits very hard. Next shot: repeat (since we don't know of a good way of getting around the EF1 voltage limits).
Apr 14 1995 12:20:20:510PM	950414016	Robert Granetz	Shot 16 -- Plasma, disrupted at 0.94 s. Same as the previous shot. Next shot: program in density ramp starting at 0.8e20 at 0.4 s, and ramping up to 1.3e20 at 0.95 s.
Apr 14 1995 12:31:20:670PM	950414017	Robert Granetz	Shot 17 -- Plasma. Ramped almost all the way down. Good plume data. Next shot: CHANGE TO UPPER X-POINT, with nl_04=1.0e20 m-2.
Apr 14 1995 12:51:07:370PM	950414018	Robert Granetz	Shot 18 -- Plasma. Ramped all the way down. nl_04=1.0e20 m-2. Succeeded in getting an upper x-point with midplane-centered plasma, but it was almost double null, and the gaps were less than 1.5 cm. Next shot: Move lower x-point down by 1.5 cm and out by 1.0 cm, and increase CLEARIN by 0.5 cm.
Apr 14 1995 01:03:18:510PM	950414019	Robert Granetz	Shot 19 -- Plasma. Ramped all the way down. Good upper x-point (not double null). FSP point is moving several mm, but might be acceptable. Next shot: repeat, with NINJA methane puffing turned on, and with scanning probe enabled.
Apr 14 1995 01:31:30:070PM	950414020	Robert Granetz	Shot 20 -- Plasma. Ramped all the way down. Good upper x-point. Good plume data. Scanning probe worked okay, but its camac hung up. Next shot: repeat.
Apr 14 1995 01:31:49:490PM	950414021	Robert Granetz	There's a water leak in the cell. It's the PCX cooling. About a 45 min. hold.
Apr 14 1995 01:46:59:220PM	950414021	Robert Granetz	Shot 21 -- Plasma. Ramped all the way down. Good FSP data. Next shot: lower the density from nl_04=1.0 to 0.6e20 m-2.
Apr 14 1995 01:57:08:030PM	950414022	Robert Granetz	Shot 22 -- Plasma. Ramped all the way down. Good plume data. nl_04=0.6e20 m-2. Next shot: enable fast scanning probe
Apr 14 1995 02:14:51:110PM	950414023	Robert Granetz	Shot 23 -- Plasma. Ramped all the way down. Good plume data. FSP only got in to 3 mm from separatrix. Need a repeat for better data. Next shot: repeat, for better FSP data.
Apr 14 1995 02:21:43:770PM	950414024	Robert Granetz	Shot 24 -- Plasma, minor disruption at 1.18 s, major disruption at 1.28 s. Next shot: raise density from nl_04=0.6 to 1.4e20 m-2.
Apr 14 1995 02:37:09:280PM	950414025	Robert Granetz	Shot 25 -- Plasma, disrupted at 1.18 s. NL_04=1.4e20 m-2, as requested. Good plume data. Next shot: repeat, with scanning probe enabled.
Apr 14 1995 02:50:50:270PM	950414026	Robert Granetz	Shot 26 -- Disrupted at 0.31 s, around the time of crossover. Next shot: repeat.
Apr 14 1995 02:59:46:450PM	950414027	Robert Granetz	Shot 27 -- Plasma, disrupted at 1.18 s. NL_04=1.4e20 m-2. This was the last shot with methane puffing from the NINJA system. Next shot: puff helium from the NINJA system. Set density at nl_04=1.0e20 m-2. Still upper x-point.
Apr 14 1995 03:14:47:980PM	950414028	Robert Granetz	Shot 28 -- Plasma. Ramped all the down. Good puff data (no plumes seen in neutral helium emission, as expected). The density went a little higher than requested, possibly due to the helium injection. Next shot: repeat, with fast scanning probe enabled.
Apr 14 1995 03:27:06:080PM	950414029	Robert Granetz	Shot 29 -- Plasma, disrupted at 1.18 s. Helium plumes seen. Scanning probe data okay. This was the last upper x-point plasma with helium puffing. Next shot: go back to lower x-point plasmas, with NINJA helium puffing, at nl_04=1.0e20 m-2. This is programmed by reloading segment 2 from shot 10 earlier today.
Apr 14 1995 03:36:58:950PM	950414030	Robert Granetz	Shot 30 -- Plasma. Ramped all the way down. Good plume data in HeII. Helium puffing tends to make the density surpass the requested value. Next shot: repeat, with fast scanning probe.
Apr 14 1995 03:50:31:640PM	950414031	Robert Granetz	Shot 31 -- Plasma. Ramped all the way down. Good HeI data. Fast scanning probe fired. Next shot: decrease density to nl_04=0.6e20 m-2.
Apr 14 1995 04:02:16:520PM	950414032	Robert Granetz	Shot 950414032 -------------- Bob has loaded NL_04=6.e19 lower null shot Plasma. Ramped all the way down. Symmetric HeI plumes. Next shot same, He II filters. Got 1.e20 on density, fueled with He.
Apr 14 1995 04:12:46:520PM	950414033	Robert Granetz	Shot 950414033 -------------- Repeat with HeII filters. Note that last shot fueled to 1.e20 due to He puff. we'll do the same again. Plasma ramped all the way down. Good plume data. Next shot 1.4e20
Apr 14 1995 04:29:57:300PM	950414034	Robert Granetz	Shot 950414034 --------------- NL04 at 1.4e20. He II filter. Disrupted at .95 sec Next shot: repeat with He I filter.
Apr 14 1995 04:40:24:270PM	950414035	Robert Granetz	Shot 950414035 --------------- NL04 at 1.4e20. He I filter. Disrupted at about the same time. Next shot: back to 1.0e20, puff CH4 from B-side upper.
Apr 14 1995 04:52:57:260PM	950414036	Robert Granetz	Shot 950414036 --------------- back to 1.0e20, puff CH4 from B-side upper, from 0.5 to 0.9sec; plenum pressure at 3psi. Plasma ran all the way down. NL_04 right on target. Next shot: B-side upper plenum to 8.4 psi.
Apr 14 1995 05:08:11:610PM	950414037	Robert Granetz	Shot 950414037 --------------- B-side upper plenum to 8.4 psi CH4 No other changes. Plasma. Ran all the way down. Everything looks good Divertor shows no sign of detachment.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:36:12:700AM	Plasma	Ok	no faults
2	08:52:46:810AM	Plasma	Ok	no faults
3	09:06:04:380AM	Plasma	Ok	no faults
4	09:20:45:860AM	Plasma	Ok	no faults
5	09:37:40:210AM	Plasma	Ok	no faults
6	09:46:38:670AM	Plasma	Ok	no faults
7	10:02:07:880AM	Plasma	Ok	no faults
8	10:18:39:340AM	Plasma	Ok	no faults
9	10:32:03:060AM	Plasma	Ok	no faults
10	10:43:34:410AM	Plasma	Ok	no faults
11	10:56:19:460AM	Plasma	Ok	no faults
12	11:09:25:400AM	Plasma	Ok	no faults
13	11:22:28:440AM	Plasma	Ok	no faults
14	11:38:31:900AM	Plasma	Ok	no faults
15	11:56:01:510AM	Plasma	Ok	no faults
16	12:11:48:220PM	Plasma	Ok	no faults
17	12:22:57:190PM	Plasma	Ok	no faults
18	12:36:01:650PM	Plasma	Ok	no faults
19	12:52:43:820PM	Plasma	Ok	no faults
20	01:06:12:950PM	Plasma	Ok	no faults
21	01:38:08:330PM	Plasma	Ok	No Faults.
22	01:51:21:430PM	Plasma	Ok	No Faults.
23	02:02:04:750PM	Plasma	Ok	No Faults.
24	02:14:58:300PM	Plasma	Ok	No Faults.
25	02:29:01:150PM	Plasma	Ok	No Faults.
26	02:43:38:430PM	Plasma	Ok	No Faults.
27	02:54:02:600PM	Plasma	Ok	No Faults.
28	03:09:24:690PM	Plasma	Ok	No Faults.
29	03:20:27:200PM	Plasma	Ok	No Faults.
30	03:33:09:740PM	Plasma	Ok	No Faults.
31	03:45:40:150PM	Plasma	Ok	No Faults.
32	03:56:57:910PM	Plasma	Ok	No Faults.
33	04:10:18:920PM	Plasma	Ok	No Faults.
34	04:25:02:540PM	Plasma	Ok	No Faults.
35	04:35:59:170PM	Plasma	Ok	No Faults.
36	04:48:15:830PM	Plasma	Ok	No Faults.
37	05:02:21:800PM	Plasma	Ok	No Faults