Miniproposals

Miniproposal: 175 Date Filed: 5/20/1997 Title: Deep Tracer-Gas Injection Experiments First Author: Francesca Bombarda Session Leader: Brian Labombard (shots 1-40)

Engineering Operator Run Comment

mp 175

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:17:523PM

Author: To Be Determined

Session Leader's summary of run 971219 MP 175, Deep Tracer-Gas Injection Experiments SL: Labombard PO: Granetz EO: Cochran -------------------------------------------------------------------------------- We did not complete the miniproposal. For reference, the original run plan is listed below. However, owing to hardware problems, this plan was essentially scrapped. See the next section for the details on what was actually performed. -------------------------------------------------------------------------------- Original Plan: First goal: Inject C2H4 from fast-scanning "burping" probe. Record CIII and CIV plumes on F-top camera during reversed flow conditions near separatrix on outer divertor. Record doppler shift in CIII lines using U. Maryland spectrometer viewing five fibers: Inner wall fibers at A-port viewing co and counter to the plasma current, F-G limiter fiber #2 which toroidally views the scanning probe, A-divertor fiber #4 which looks nearly tangent to the outer divertor nose, and A-B limiter fiber #1-4 which views 15 mm inside the A-B limiter. Monitor carbon impurity levels in the divertor using the CHROMEX. Second goal: Repeat above with HeII. Third goal: Determine screening properties of SOL to non-recycling impurities. Inject CCl2F2 from fast-scanning "burping" probe at various depths in SOL. Monitor F (McPherson) in edge and in divertor (CHROMEX) and monitor Cl in core (HIREX). Target Plasmas: All plasmas will be 0.8 MA, 5.3 Tesla, diverted, ohmic shots (similar to 971211008) with optimized FSP target, and inner/outer gaps increased to ~ 2 cm. RF may be injected after 1.1 sec for conditioning. Three different flat-top plasma densities will be required: (A) low density - NL04 = 0.5 to 0.6x10^20 - reversed flow (Yes, we need it that low!) (B) medium density - NL04 = 1.0x10^20 - high recycling (C) high density - NL04 > 1.3x10^20 - detached divertor Gas system setup: - Install ethylene bottle in the place where hydrogen is usually connected. Set regulator pressure to 10 PSI absolute. - Install helium bottle in usual position with usual regulator pressures. - Install freon bottle in the place where nitrogen is usually connected. Set regulator pressure to 10 PSI absolute. Discharge cleaning: No ECDC. Initial Lower Div Cap Gas Setup: Purge lower divertor capillary plenum and F-port manifold plenum. It is best to do a manual purge, waiting until the residual pressure gets below about 20 mtorr. Be sure to open the valve to the F-port manifold plenum (controlled on the NINJA PLC screen) during the purge. Close F-port plenum valve and fill lower divertor capillary plenum and feed lines to 2 PSI ethylene (C2H4). Shot Sequence Plan: 1-4 Start from 971211008 with medium density, (B) NL04=1.0x10^20. Tune up FSP target to provide 3 different insertion depths into SOL at .6, .8, and 1.0 sec. Increase right gap to 2.0 cm. Obtain SSEP > 2 cm. Verify high recycling condition in outer divertor with divertor probes. Inject 10^17 C2H4 molecules per scan and optimize puff and camera gates to yield best exposures in CIII and CIV. 5-8 Optimize and record non-reversed flow CIII and CIV plumes on F-top camera. Set insertion depths at rho=10-15 mm for CIII plumes and rho=0-5 mm for CIV plumes. If CIV plumes look very good, then try a plume just inside the LCFS. 9-12 Change to low density, (A) NL04 = 0.5 to 0.6x10^20. Verify low recycling condition in outer divertor with divertor probes. Optimize and record reversed flow, CIII and CIV plumes on F-top camera. Again, coordinate insertion depths with carbon filters. 13-16 Purge lower divertor capillary plenum and F-port manifold plenum. Close F-port plenum and fill lower divertor capillary plenum to 2 PSI helium. Optimize and record reversed flow HeII plumes on F-top camera. Set insertion depths at rho=2-4 mm, and rho=10-15 mm. 17-20 Back to medium density, (B) NL04 = 1.0x10^20. Optimize and record non-reversed flow, HeII plumes on F-top camera. Set insertion depths at rho=2-4 mm, and rho=10-15 mm. 21-24 Purge lower divertor capillary plenum and F-port manifold plenum. Close F-port plenum and fill lower divertor capillary plenum to 2 PSI freon (CCl2F2). Set up burping probe to inject 10^17 molecules per scan. Optimize for good HIREX signals on deep insertions. Try insertion depths of rho=-1, 20, 10, 5 mm 25-28 Set to low density, (A). Repeat screening measurements in reversed flow condition. 29-32 Set to high density, (C). Repeat screening measurements in detached condition. -------------------------------------------------------------------------------- What was actually accomplished: -------------------------------------------------------------------------------- Helium injection tests perform on the evening before the run revealed that the inertial valve on the fast-scanning probe has stuck in the closed position. This meant that no plumes could be produced, nor could any SOL screening be performed. As a result, the original run plan has scraped. A new run plan was improvised focussing on three elements: (1) Carry out most of the original plan for Doppler flow measurements by the U. Maryland group with helium injections from the wall-mounted capillary system. (2) In conjunction with (1), study plasma flows with the scanning Mach probe. Do a density scan as originally planned to monitor changes in flows when accessing low recycling, high recycling, and detached regimes. (3) Take advantage of the improved scanning probe electronics (which apparently no longer picks up RF!) to study RF heated plasmas and specifically enhanced D-alpha H-modes. Study SOL flows during these conditions also. We did pretty well in meeting the first objective. We stayed with helium injections from divertor capillary B22-022 ("bridge of the inner nose") and with the A-B limiter capillary A33-001. We needed to inject quite a bit of helium (2-3 torr-liters per shot) in order for the high resolution spectrometer to see it but the plasma did not seem to care. Jim Weaver thinks that he got some very good data with calibrations from shot 21 on. (The stuff that doctoral theses are made of!) Low or no HeII signal was obtained from the A-B limiter fiber. But good signal was detected on the inner wall viewing fibers, the divertor fiber, and the scanning probe viewing fiber. The latter data will allow a direct comparison with the Mach probe results. It will be interesting to see how the flows on the inner wall and in the divertor change as the plasma conditions change - which was really the whole point! The scanning probe performed well also, meeting objectives (2) and (3). We kept the plasma current at 0.8 MA and the RF power below 1.5 MW so that we could occasionally scan past the separatrix and not get burned. Mach flow data was recorded on all the scans. We took 3 scans per shot, two in ohmic mode and one typically in enhanced D-alpha mode. We also scanned a couple of RF-heated L-modes, and one ELM-free H-mode. The was no immediate evidence of RF noise on the probe data. We also put in a B-toroidal field ramp so Amanda could get some ECE profile data. As a result, we should be able to construct complete core/SOL Te profiles. On a few scans, the probe was inserted a few mm inside the last closed flux surface on EDA H-modes and ELM-free H-modes (at least by EFIT's account). Looking at the raw I-V data I got the impression that the steep density gradient region had not been crossed. This suggests that the transport barrier is not at the separatrix but at least a few mm inside! However, full ion saturation may not have been achieved during the I-V sweep so the final answer will need to await probe data analysis. Some detailed notes: Shot #1-10 setup equilibrium NL04 request ~ 0.9x10^20 RF ~ 1 MW Shot#11 first FSP scan Shot#12 FSP scan Shot#13 FSP scan in EDA - 3 mm out Shot#14 no FSP Shot#15 FSP scan in EDA - 2 mm inside LCFS Shot#16 FSP scan in EDA - to LCFS NL04 request ~ 0.6x10^20 RF ~ 1 MW Shot#17 no FSP Shot#21 FSP scan Shot#22 FSP scan in ELM-free to LCFS Shot#23 FSP scan in ELM-free to LCFS Shot#26 FSP scan in ELM-free, 4 mm inside LCFS NL04 request ~ 0.8x10^20 RF ~ 1 MW Shot#27 FSP scan in dithering mode to LCFS NL04 request ~ 0.8x10^20 RF ~ 1.5 MW Shot#29 FSP scan in EDA to LCFS NL04 request ~ 1x10^20 RF ~ 1.5 MW Shot#30 FSP scan in EDA to 4 mm inside LCFS NL04 request ~ 1.2x10^20 RF ~ 1.5 MW Shot#31 FSP scan in EDA to LCFS, some arcing Shot#32 FSP scan in EDA to LCFS, outer divertor Te down to 10 eV NL04 request ~ 1.5x10^20 RF ~ 1.5 MW Shot#33 FSP scan, momentary detachments (impurity-assisted), death rays, RF=0.75 MW Shot#34 FSP scan, detachment, death rays, No RF Shot#38 FSP scan, RF=0.75 MW Shot#39 FSP scan, RF=0.75 MW Final Note: The stuck inertial is inside the probe head and is under torus vacuum. So unless there is an up-to-air sometime during this run period when the probe head can be replaced, there is no way we can complete miniproposal #175 during this run period. (Also I need to build a replacement probe head!) But...there is always next year.

Physics Operator Summaries

Entered: Jul 7 2004 04:36:58:287PM

Author: To Be Determined

Physics operator summary for run 971219 MP 175 : Deep-Tracer Gas Experiments (FSP puff experiments) SL: Labombard PO: Granetz Summary: Due to a problem with the B-FSP valve (it was stuck closed), the mini-proposal originally planned for today could not be attempted. Instead, we spent the day getting probe scans of L-modes, ELM-free H-modes, ELMy H-modes, and EDA H-modes, over a range of densities. On one shot, Brian proved that the H-mode pedestal is more than 4 mm inside of the LCFS, which is consistent with the edge xray data and recent GPC data (assuming EFIT is correct about the LCFS). Some physop things learned today: (1) Running plasmas with 2 cm gaps on both the inboard and outboard sides gives an elongation of 1.7, and n/ncrit=1.17, which is too vertically unstable for our feedback control. Lowering ZCUR helps, but is not enough. (2) Sometimes you have to wait through 2 fizzles without changing anything, and the plasma still comes back robustly after that. Scorecard: 32 plasmas 4 fizzles 2 duds (1 due to power supply fault) 2 tests (to fix computer problems) ---------- 40 total ------------------------------------------------------------------------------ Run Plan for Friday, 971219 MP 175 -- Deep-Tracer Gas Experiments (FSP puff experiments) See Brian's detailed run plan posted on the OPS Bulletin folder. Engineering setup for Friday, 19 Dec 1997: No ECDC at all (none overnight, none before the run) Engineering setup as on 971211008, with TF under hybrid control This will be 0.8 MA, 5.3 T, nl_04=1e20 m-2, flattop to 1.0-1.2 s, no RF Gas setup - fill K-side with 20 PSI of D2, hybrid enable fill B-top with 6 PSI of D2, hybrid enable fill B-side-lower with 1 PSI of Ar, hybrid enable Install ethylene bottle in the place where hydrogen is usually connected. Set regulator pressure to 10 psi. Install helium bottle in the usual position, with usual regulator pressure. Install freon bottle in the place where nitrogen is usually connected. Set regulator pressure to 10 psi. Ninja system setup: Purge lower divertor capillary plenum and F-port manifold plenum. It is best to do a manual purge, waiting until the residual pressure gets below about 20 mtorr. Be sure to open the valve to the F-port manifold plenum (controlled on the NINJA PLC screen) during the purge. Close F-port plenum valve and fill lower divertor capillary plenum and feed lines to 2 PSI ethylene (C2H4). The following gate valves should be enabled, assuming no vacuum problems: ECE (no others until we verify the status of each system) ------------------------------------------------------------------------------- Detailed shot log: Note: The microwave horn flange has a bad leak. It has been bagged off and backfilled with argon. There is a large argon peak on the RGA. Note: no ECDC was done between the end of yesterday's run and the beginning of today's run. Hybrid coldstart done; no errors found ($set default cmod$models:[hybrid.tcl] $@hybinit_dispatch $@show_bitbus_log Use editor to search for no "error" and no "not respond") Reload plasma shot 971211008 (0.8 MA, 5.3 T) Confirm nl_04=1.0e20 m-2. Confirm flattop set to t=1.0-1.2 s. Increase inner and outer gaps to 2.0 cm No RF (i.e. not before t=1.1 s; okay after t=1.1 s) Turn off RF feedback on RCUR (RF_LOAD_E = 0.0) Shot 01 -- Plasma. Disrupted at 0.60 s. Halo current warning (180 kA). Ip=1.0 MA, nl04=1.0e20 m-2. Kappa=1.70. Inner gap=2.1 cm, outer gap=1.7 cm. Next shot: reduce Ip to 0.8 MA, reduce CLEARIN by 2 mm. This should give gaps of 1.9 cm. Shot 02 -- Plasma. 0.8 MA, nl04=1.0e20 m-2. Disrupted at 1.13 s. Looks like it went vertically unstable. TF field has a 5% ramp (holdover from the loaded segment). N/Ncrit=1.17. Next shot: remove 5% TF ramp. Increase ZXL after 1.1 s. Shot 03 -- Plasma. Disrupted at 0.67 s. Several moly injections on 2pi bolo. Next shot: repeat with no changes. Shot 04 -- Plasma. Disrupted at 1.09 s. Inner gap=1.6 cm, outer gap=1.4 cm. We will break here to switch the argon backfill to a helium backfill on the leaking microwave horn. Next shot: move ZCUR down by 3 mm during the flattop. Note: Brian has determined that the Burping Fast Scanning Probe valve is stuck in the closed position. That will effectively scrub the planned mini-proposal. See the session leader's run summary to find out what we'll be doing for the rest of the run. He has requested the RF to turn on at 0.9 s. Shot 05 -- Plasma. Good shot. Prf=1 MW, RF pulse goes from t=0.9 to 1.2 s. Looks like an ELMy H-mode, or maybe a ratty EDA. Inner gap=1.6 cm, outer gap=1.4 cm. Next shot: detailed changes on RXL to satisfy FSP strike geometry. Shot 06 -- Plasma. Another early disruption (@ 0.57 s.) Does not look like a moly brick though. Next shot: small change to RXL early in the shot. Shot 07 -- Plasma. Another early disruption (@ 0.61 s). Next shot: lower ZCUR by another 2 mm. Shot 08 -- Plasma. Another early disruption (@ 0.58 s). I'm giving up on this equilibrium configuration. Next shot: load segment 2 from 971218029 (last shot from yesterday). Increase nl04 to 1.0e20 m-2. Will have to adjust gaps, etc on following shots. Shot 09 -- Plasma. Good shot. nl04=0.85e20 m-2, which is less than requested. Inner gap=1.4 cm. Outer gap=1.1 cm. Prf=1 MW. Next shot: increase outer gap by 5 mm, and put an outwards ramp on RXL from 0.95 to 1.2 s. Also lower ZCUR by 5 mm to keep kappa low. Shot 10 -- Plasma. Good shot. nl04=0.9e20 m-2. Prf=1 MW, RF pulse from 0.9 to 1.2 s. EDA H-mode starts at 0.95 s. Inner gap=1.4 cm. Outer gap=1.3 cm. Next shot: put in a 5% ramp in Btor from t=1.0 to 1.1 s. Add an additional 5 mm to the outward ramp on RXL. Increase outer gap another 2 mm (reduce RCUR 1 mm). Shot 11 -- Plasma. Good shot. EDA H-mode starting at 0.96 s. Prf=1 MW. Inner gap=1.4-1.5 cm, outer gap=1.4 cm. Next shot: more tweaks to RXL. Shot 12 -- Plasma. Good shot. EDA H-mode. Prf=1.0 MW. Inner gap=1.4-1.5 cm, outer gap=1.4-1.5 cm. Next shot: more tweaks to RXL. Shot 13 -- Plasma. Good shot. EDA. Very similar to the previous shots. Next shot: no changes. Shot 14 -- Plasma. Good shot. EDA. Very similar to the previous shots. Next shot: increase NINJA plenum pressure from 2.5 to 4 psi. No other changes. Shot 15 -- Plasma. Good shot. EDA. Very similar to the previous shots. Next shot: repeat. Shot 16 -- Plasma. Good shot. EDA. Very similar to the previous shots. Next shot: lower the density to nl04=0.6e19 m-2 (from 1.0) Shot 17 -- Plasma. Good shot. Target density ramps slowly from nl04=0.7 to 0.9e20 m-2. We wanted a constant 0.6e20. Plasma was dithering for 0.2 s. Questionable about whether this one had any EDA H-mode. Next shot: repeat, this time fire the probe. Shorten the NINJA helium pulse to 0.3 s (was 0.4). Shot 18 -- Fizzle. Looks like a small BR tweak is needed. Next shot: raise BR offset from 0.006 to 0.0065 T Shot 19 -- Fizzle. Null looks okay. Next shot: reduce pre-pulse gas puff from 15 to 13 ms. Shot 20 -- Dud. Next shot: reload shot 017, which is the last one that went. If that doesn't do it, then we'll try to fix the sparker. (It started misbehaving earlier today.) Shot 21 -- Plasma. Good shot. Long ELM-free H-mode (0.25 s). Prf=1 MW. Brian got FSP data. Next shot: repeat Shot 22 -- Plasma. Good shot. ELM-free H-mode. Strange glitch at 1.12 s. Brian is getting FSP measurements of the ELM-free SOL conditions Next shot: put in a 3 mm downward ramp in ZXL, from t=0.8 to 1.2 s. Shot 23 -- Plasma. Good shot. ELM-free H-mode. Prf=1 MW Next shot: repeat. FSP will scan further in, based on the xray pedestal being 10 mm inside the separatrix, and the fact that the FSP doesn't see much ne or Te at the separatrix. Also, increase NINJA helium pulse width back to 0.5 s. Shot 24 -- Fizzle. Null looks good. Next shot: repeat with no changes Shot 25 -- Fizzle. Next shot: on a lark (suggested by Brian) reload shot 23 (even though I haven't touched PCS since then). Shot 26 -- Plasma. Good shot. ELM-free H-mode. Prf=1 MW. Next shot: increase density to nl04=0.8e20 m-2 (was 0.6). Shot 27 -- Plasma. Good shot. Dithering, then into EDA. Density increased to nl04=0.8-0.9e20 m-2, as requested. Next shot: repeat with higher RF power. Shot 28 -- Dud. No TF Next shot: try again, no changes Shot 29 -- Plasma. Good shot. Prf=1.6 MW. EDA H-mode for nearly the entire RF pulse. There were some large moly bricks during the shot. Next shot: raise density to nl04=1.0e20 m-2 (was 0.8) Shot 30 -- Plasma. Good shot. Prf=1.6 MW. EDA H-mode for nearly the entire RF pulse. Still have some moly bursts. Next shot: raise density to nl04=1.2e20 m-2 (was 1.0) Shot 31 -- Plasma. Good shot. Prf=1.6 MW. EDA H-mode for nearly the entire RF pulse. Still have some moly bursts. Density is not getting much above nl04=1.0e20 m-2. Next shot: increase K-side pressure to 30 psi to increase fueling. Shot 32 -- Plasma. Good shot. Prf=1.6 MW. EDA H-mode. Density reached nl04=1.12e20 m-2 (requested 1.2). Next shot: raise density again to nl04=1.5e20 m-2 (and hope to get 1.4). Shot 33 -- Plasma. Good shot. Prf=0.8 MW (E-port antenna didn't work). No H-modes of any kind. There was a very big moly brick at 0.45 s which took a bite out of Ip, and momentarily doubled the density. Next shot: repeat, trying to get both antennas going. Shot 34 -- Plasma. Good shot. Disrupted at 1.32 s. RF had problems with both antennas. Next shot: try again, no changes Shot 35 -- Plasma, but disrupted at 0.59 s. I think it's a brick, but I'm not sure. There's also a niobium injection at 0.47 s. There's a problem with the computers. Next shot: no power shot to get the shot cycle going again. Shot 36 -- non-existant, due to computer problems Shot 37 -- no power shot cycle Shot 38 -- Plasma. Good shot. Only one RF antenna stayed on. No H-modes. Next shot: increase argon puff to 40 ms (from 22 ms). Shot 39 -- Plasma. Good shot. Prf=1.4 MW. No H-modes. No increase in divertor argon signals, either (for Bruce). Next shot: increase Ip to 1.0 MA, and decrease density to nl04=1.2e20 m-2. Also increase argon puff to 80 ms (from 40 ms). Also, turn on the lithium pellet injector. Shot 40 -- Plasma. Good shot. Ip=1.0 MA. ELMy H-mode. Prf=1.5 MW, but there were multiple dropouts. No lithium pellet. Bruce finally saw some argon in the divertor. End of run.

Session Leader Comments
Dec 19 1997 09:18:23:360AM		Brian Labombard	Since the burping probe valve is currently stuck closed, we will modify today's run plan a bit. We will be puffing helium (and perhaps ethylene later) using the wall capillaries in place of the burping probe to get doppler flow measurements on the U. Maryland spectrometer. RF will be injected starting around .9 sec to get into EDA modes. We will study SOL profiles and flows with the F-port scanning probe during ohmic and EDA mode.
Dec 19 1997 09:39:31:360AM	971219007	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-002. Pressure: 136 torr trigger: 0.1 sec duration 0.1 sec
Dec 19 1997 09:46:16:790AM	971219008	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-002. Pressure: 136 torr trigger: 0.1 sec duration 0.1 sec
Dec 19 1997 10:04:04:120AM	971219009	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-002. Pressure: 136 torr trigger: 0.1 sec duration 0.1 sec
Dec 19 1997 10:16:05:350AM	971219010	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-002. Pressure: 136 torr trigger: 0.1 sec duration 0.2 sec FSP scanning at .6, .8 and 1.1 sec, 10 mm outside LCFS
Dec 19 1997 10:30:43:940AM	971219011	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-002. Pressure: 136 torr trigger: 0.1 sec duration 0.3 sec FSP scanning at .6, .8 and 1.1 sec
Dec 19 1997 10:35:16:800AM	971219012	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-002. Pressure: 136 torr trigger: 0.1 sec duration 0.3 sec FSP scanning at .6, .8 and 1.1 sec
Dec 19 1997 10:53:17:520AM	971219013	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-002. Pressure: 136 torr trigger: 0.0 sec duration 0.4 sec FSP scanning at .6, .8 and 1.1 sec, 3 mm outside LCFS in EDA
Dec 19 1997 11:08:09:850AM	971219014	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-002. Pressure: 136 torr trigger: 0.0 sec duration 0.4 sec FSP did not fire. Repeat.
Dec 19 1997 11:23:10:870AM	971219015	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-022. Pressure: 239 torr trigger: 0.0 sec duration 0.4 sec FSP firing at .6, .8 and 1.1 sec. Went 2mm inside sep during EDA. Next shot repeat. Weaver sees good HeII signals on spectrometer - keep gas settings the same.
Dec 19 1997 11:31:58:020AM	971219016	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-022. Pressure: 239 torr trigger: 0.0 sec duration 0.4 sec FSP firing at .6, .8 and 1.1 sec. Got to LCFS during EDA. Next shot lower density.
Dec 19 1997 11:43:00:660AM	971219017	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-022. Pressure: 239 torr trigger: 0.0 sec duration 0.4 sec Probe not firing. EDA starts late.
Dec 19 1997 12:46:17:710PM	971219022	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-022. Pressure: 239 torr trigger: 0.0 sec duration 0.3 sec Probe firing at .6, .8, 1.16. Probe makes it to LCFS in Elm-free H-mode.
Dec 19 1997 12:55:21:100PM	971219023	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-022. Pressure: 239 torr trigger: 0.0 sec duration 0.3 sec Probe firing at .6, .8, 1.0 Probe makes it to LCFS in Elm-free H-mode.
Dec 19 1997 01:35:42:520PM	971219026	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-022. Pressure: 239 torr trigger: 0.0 sec duration 0.4 sec Probe firing at .6, .8, 1.05 Last scan goes inside LCFS by 4 mm in Elm-free H-mode.
Dec 19 1997 01:44:49:270PM	971219027	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-022. Pressure: 239 torr trigger: 0.0 sec duration 0.4 sec Probe firing at .6, .8, 1.05 Last scan goes to LCFS in dithering mode. Increasing RF power to 1.5 MW in next shot.
Dec 19 1997 02:14:19:460PM	971219029	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-022. Pressure: 239 torr trigger: 0.0 sec duration 0.4 sec Probe firing at .6, .8, 1.05. Last scan goes close to LCFS in EDA Increasing density.
Dec 19 1997 02:29:31:480PM	971219030	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-022. Pressure: 230 torr trigger: 0.0 sec duration 0.4 sec Probe firing at .6, .8, 1.05. Last scan goes4 mm inside LCFS in EDA. Increasing density again.
Dec 19 1997 02:55:00:690PM	971219031	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-022. Pressure: 230 torr trigger: 0.0 sec duration 0.4 sec Probe firing at .6, .8, 1.05. Last scan goes to LCFS in EDA. Some arcing during peak insertoin. Next, try to get 1.2e20 on NL04
Dec 19 1997 03:08:04:980PM	971219032	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-022. Pressure: 230 torr trigger: 0.0 sec duration 0.4 sec Probe firing at .6, .8, 1.05. Last scan goes to LCFS in EDA. Getting down to the 10eV level on the outer divertor.
Dec 19 1997 03:14:50:460PM	971219033	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-022. Pressure: 226 torr trigger: 0.0 sec duration 0.4 sec Probe firing at .6, .8, 1.05. E-antenna did not go. Repeat. Impurity injections cause the outer divertor to detach momentarily. Death-rays seen on outer divertor, probe#4.
Dec 19 1997 04:19:05:090PM	971219034	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-022. Pressure: 226 torr trigger: 0.0 sec duration 0.4 sec Probe firing at .6, .8, 1.05. No RF Outer divertor shows moderate detachment (probe#7) from .42 to .72 sec Death rays seen on probe#6.
Dec 19 1997 04:50:40:330PM	971219038	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-022. Pressure: 226 torr trigger: 0.0 sec duration 0.4 sec Probe firing at .6, .8, 1.05. D antenna only. Three scans to separatrix. Last scan is RF heated L-mode.
Dec 19 1997 04:51:14:040PM	971219039	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-022. Pressure: 226 torr trigger: 0.0 sec duration 0.4 sec Probe firing at .6, .8, 1.05. 1.5 MW RF No H-mode Three scans to separatrix. Last scan is RF heated L-mode.
Dec 19 1997 06:05:57:370PM	971219040	Brian Labombard	Puffing helium through NINJA capillaries A33-001 and B22-022. Pressure: 226 torr trigger: 0.0 sec duration 0.6 sec Probe not firing.

Physics Operator Comments
Dec 19 1997 07:28:54:500AM		Robert Granetz	Run Plan for Friday, 971219 MP 175 -- Deep-Tracer Gas Experiments (FSP puff experiments) See Brian's detailed run plan posted on the OPS Bulletin folder. Engineering setup for Friday, 19 Dec 1997: No ECDC at all (none overnight, none before the run) Engineering setup as on 971211008, with TF under hybrid control This will be 0.8 MA, 5.3 T, nl_04=1e20 m-2, flattop to 1.0-1.2 s, no RF Gas setup - fill K-side with 20 PSI of D2, hybrid enable fill B-top with 6 PSI of D2, hybrid enable fill B-side-lower with 1 PSI of Ar, hybrid enable Install ethylene bottle in the place where hydrogen is usually connected. Set regulator pressure to 10 psi. Install helium bottle in the usual position, with usual regulator pressure. Install freon bottle in the place where nitrogen is usually connected. Set regulator pressure to 10 psi. Ninja system setup: Purge lower divertor capillary plenum and F-port manifold plenum. It is best to do a manual purge, waiting until the residual pressure gets below about 20 mtorr. Be sure to open the valve to the F-port manifold plenum (controlled on the NINJA PLC screen) during the purge. Close F-port plenum valve and fill lower divertor capillary plenum and feed lines to 2 PSI ethylene (C2H4). The following gate valves should be enabled, assuming no vacuum problems: ECE (no others until we verify the status of each syst
Dec 19 1997 08:38:05:010AM		Robert Granetz	Note: The microwave horn flange has a bad leak. It has been bagged off and backfilled with argon. There is a large argon peak on the RGA. Note: no ECDC was done between the end of yesterday's run and the beginning of today's run. Hybrid coldstart done; no errors found ($set default cmod$models:[hybrid.tcl] $@hybinit_dispatch $@show_bitbus_log Use editor to search for no "error" and no "not respond") Reload plasma shot 971211008 (0.8 MA, 5.3 T) Confirm nl_04=1.0e20 m-2. Confirm flattop set to t=1.0-1.2 s. Increase inner and outer gaps to 2.0 cm No RF (i.e. not before t=1.1 s; okay after t=1.1 s) Turn off RF feedback on RCUR (RF_LOAD_E = 0.0)
Dec 19 1997 08:04:20:050AM	971219001	Robert Granetz	Shot 01 -- Plasma. Disrupted at 0.60 s. Halo current warning (180 kA). Ip=1.0 MA, nl04=1.0e20 m-2. Kappa=1.70. Inner gap=2.1 cm, outer gap=1.7 cm. Next shot: reduce Ip to 0.8 MA, reduce CLEARIN by 2 mm. This should give gaps of 1.9 cm.
Dec 19 1997 08:21:32:770AM	971219002	Robert Granetz	Shot 02 -- Plasma. 0.8 MA, nl04=1.0e20 m-2. Disrupted at 1.13 s. Looks like it went vertically unstable. TF field has a 5% ramp (holdover from the loaded segment). N/Ncrit=1.17. Next shot: remove 5% TF ramp. Increase ZXL after 1.1 s.
Dec 19 1997 08:30:41:750AM	971219003	Robert Granetz	Shot 03 -- Plasma. Disrupted at 0.67 s. Several moly injections on 2pi bolo. Next shot: repeat with no changes.
Dec 19 1997 08:52:05:560AM	971219004	Robert Granetz	Shot 04 -- Plasma. Disrupted at 1.09 s. Inner gap=1.6 cm, outer gap=1.4 cm. We will break here to switch the argon backfill to a helium backfill on the leaking microwave horn. Next shot: move ZCUR down by 3 mm during the flattop.
Dec 19 1997 09:17:15:430AM	971219005	Robert Granetz	Shot 05 -- Plasma. Good shot. Prf=1 MW, RF pulse goes from t=0.9 to 1.2 s. Looks like an ELMy H-mode, or maybe a ratty EDA. Inner gap=1.6 cm, outer gap=1.4 cm. Next shot: detailed changes on RXL to satisfy FSP strike geometry.
Dec 19 1997 09:28:15:040AM	971219006	Robert Granetz	Shot 06 -- Plasma. Another early disruption (@ 0.57 s.) Does not look like a moly brick though. Next shot: small change to RXL early in the shot.
Dec 19 1997 09:38:26:880AM	971219007	Robert Granetz	Shot 07 -- Plasma. Another early disruption (@ 0.61 s). Next shot: lower ZCUR by another 2 mm.
Dec 19 1997 09:47:44:810AM	971219008	Robert Granetz	Shot 08 -- Plasma. Another early disruption (@ 0.58 s). I'm giving up on this equilibrium configuration. Next shot: load segment 2 from 971218029 (last shot from yesterday). Increase nl04 to 1.0e20 m-2. Will have to adjust gaps, etc on following shots.
Dec 19 1997 10:04:08:820AM	971219009	Robert Granetz	Shot 09 -- Plasma. Good shot. nl04=0.85e20 m-2, which is less than requested. Inner gap=1.4 cm. Outer gap=1.1 cm. Prf=1 MW. Next shot: increase outer gap by 5 mm, and put an outwards ramp on RXL from 0.95 to 1.2 s. Also lower ZCUR by 5 mm to keep kappa low.
Dec 19 1997 10:17:11:240AM	971219010	Robert Granetz	Shot 10 -- Plasma. Good shot. nl04=0.9e20 m-2. Prf=1 MW, RF pulse from 0.9 to 1.2 s. EDA H-mode starts at 0.95 s. Inner gap=1.4 cm. Outer gap=1.3 cm. Next shot: put in a 5% ramp in Btor from t=1.0 to 1.1 s. Add an additional 5 mm to the outward ramp on RXL. Increase outer gap another 2 mm (reduce RCUR 1 mm).
Dec 19 1997 10:30:28:060AM	971219011	Robert Granetz	Shot 11 -- Plasma. Good shot. EDA H-mode starting at 0.96 s. Prf=1 MW. Inner gap=1.4-1.5 cm, outer gap=1.4 cm. Next shot: more tweaks to RXL.
Dec 19 1997 10:41:43:760AM	971219012	Robert Granetz	Shot 12 -- Plasma. Good shot. EDA H-mode. Prf=1.0 MW. Inner gap=1.4-1.5 cm, outer gap=1.4-1.5 cm. Next shot: more tweaks to RXL.
Dec 19 1997 10:50:25:230AM	971219013	Robert Granetz	Shot 13 -- Plasma. Good shot. Very similar to the previous shots. Next shot: no changes.
Dec 19 1997 11:04:12:950AM	971219014	Robert Granetz	Shot 14 -- Plasma. Good shot. EDA. Very similar to the previous shots. Next shot: increase NINJA plenum pressure from 2.5 to 4 psi. No other changes.
Dec 19 1997 11:16:54:730AM	971219015	Robert Granetz	Shot 15 -- Plasma. Good shot. EDA. Very similar to the previous shots. Next shot: repeat.
Dec 19 1997 11:28:43:250AM	971219016	Robert Granetz	Shot 16 -- Plasma. Good shot. EDA. Very similar to the previous shots. Next shot: lower the density to nl04=0.6e19 m-2 (from 1.0)
Dec 19 1997 11:42:02:390AM	971219017	Robert Granetz	Shot 17 -- Plasma. Good shot. Target density ramps slowly from nl04=0.7 to 0.9e20 m-2. We wanted a constant 0.6e20. Plasma was dithering for 0.2 s. Questionable about whether this one had any EDA H-mode. Next shot: repeat, this time fire the probe. Shorten the NINJA helium pulse to 0.3 s (was 0.4).
Dec 19 1997 11:54:55:030AM	971219018	Robert Granetz	Shot 18 -- Fizzle. Looks like a small BR tweak is needed. Next shot: raise BR offset from 0.006 to 0.0065 T
Dec 19 1997 12:04:04:580PM	971219019	Robert Granetz	Shot 19 -- Fizzle. Null looks okay. Next shot: reduce pre-pulse gas puff from 15 to 13 ms.
Dec 19 1997 12:11:55:700PM	971219020	Robert Granetz	Shot 20 -- Fizzle again. Next shot: reload shot 017, which is the last one that went. If that doesn't do it, then we'll try to fix the sparker. (It started misbehaving earlier today.)
Dec 19 1997 12:24:50:070PM	971219021	Robert Granetz	Shot 21 -- Plasma. Good shot. Long ELM-free H-mode (0.25 s). Prf=1 MW. Brian got FSP data. Next shot: repeat
Dec 19 1997 12:43:51:880PM	971219022	Robert Granetz	Shot 22 -- Plasma. Good shot. ELM-free H-mode. Strange glitch at 1.12 s. Brian is getting FSP measurements of the ELM-free SOL conditions Next shot: put in a 3 mm downward ramp in ZXL, from t=0.8 to 1.2 s.
Dec 19 1997 12:57:25:480PM	971219023	Robert Granetz	Shot 23 -- Plasma. Good shot. ELM-free H-mode. Prf=1 MW Next shot: repeat. FSP will scan further in, based on the xray pedestal being 10 mm inside the separatrix, and the fact that the FSP doesn't see much ne or Te at the separatrix. Also, increase NINJA helium pulse width back to 0.5 s.
Dec 19 1997 01:02:57:930PM	971219024	Robert Granetz	Shot 24 -- Fizzle. Null looks good. Next shot: repeat with no changes
Dec 19 1997 01:23:09:470PM	971219025	Robert Granetz	Shot 25 -- Fizzle. Next shot: on a lark (suggested by Brian) reload shot 23 (even though I haven't touched PCS since then).
Dec 19 1997 01:34:46:260PM	971219026	Robert Granetz	Shot 26 -- Plasma. Good shot. ELM-free H-mode. Prf=1 MW. Next shot: increase density to nl04=0.8e20 m-2 (was 0.6).
Dec 19 1997 01:42:45:890PM	971219027	Robert Granetz	Shot 27 -- Plasma. Good shot. Dithering, then into EDA. Density increased to nl04=0.8-0.9e20 m-2, as requested. Next shot: repeat with higher RF power.
Dec 19 1997 01:52:20:060PM	971219028	Robert Granetz	Shot 28 -- Dud. No TF Next shot: try again, no changes
Dec 19 1997 02:12:53:190PM	971219029	Robert Granetz	Shot 29 -- Plasma. Good shot. Prf=1.6 MW. EDA H-mode for nearly the entire RF pulse. There were some large moly bricks during the shot. Next shot: raise density to nl04=1.0e20 m-2 (was 0.8)
Dec 19 1997 02:23:43:390PM	971219030	Robert Granetz	Shot 30 -- Plasma. Good shot. Prf=1.6 MW. EDA H-mode for nearly the entire RF pulse. Still have some moly bursts. Next shot: raise density to nl04=1.2e20 m-2 (was 1.0)
Dec 19 1997 02:43:51:210PM	971219031	Robert Granetz	Shot 31 -- Plasma. Good shot. Prf=1.6 MW. EDA H-mode for nearly the entire RF pulse. Still have some moly bursts. Density is not getting much above nl04=1.0e20 m-2. Next shot: increase K-side pressure to 30 psi to increase fueling.
Dec 19 1997 02:57:26:290PM	971219032	Robert Granetz	Shot 32 -- Plasma. Good shot. Prf=1.6 MW. EDA H-mode. Density reached nl04=1.12e20 m-2 (requested 1.2). Next shot: raise density again to nl04=1.5e20 m-2 (and hope to get 1.4).
Dec 19 1997 03:09:35:410PM	971219033	Robert Granetz	Shot 33 -- Plasma. Good shot. Prf=0.8 MW (E-port antenna didn't work). No H-modes of any kind. There was a very big moly brick at 0.45 s which took a bite out of Ip, and momentarily doubled the density. Next shot: repeat, trying to get both antennas going.
Dec 19 1997 03:51:02:980PM	971219034	Robert Granetz	Shot 34 -- Plasma. Good shot. Disrupted at 1.32 s. RF had problems with both antennas. Next shot: try again, no changes
Dec 19 1997 04:08:39:420PM	971219035	Robert Granetz	Shot 35 -- Plasma, but disrupted at 0.59 s. I think it's a brick, but I'm not sure. There's also a niobium injection at 0.47 s. Next shot: no power shot to get the shot cycle going again.
Dec 19 1997 04:17:36:530PM	971219036	Robert Granetz	Shot 36 -- non-existant, due to computer problems
Dec 19 1997 04:23:25:310PM	971219037	Robert Granetz	Shot 37 -- no power shot cycle
Dec 19 1997 04:31:45:590PM	971219038	Robert Granetz	Shot 38 -- Plasma. Good shot. Only one RF antenna stayed on. No H-modes. Next shot: increase argon puff to 40 ms (from 22 ms).
Dec 19 1997 04:48:13:400PM	971219039	Robert Granetz	Shot 39 -- Plasma. Good shot. Prf=1.4 MW. No H-modes. No increase in divertor argon signals, either (for Bruce). Next shot: increase Ip to 1.0 MA, and decrease density to nl04=1.2e20 m-2. Also increase argon puff to 80 ms (from 40 ms) Also, turn on the lithium pellet injector.
Dec 19 1997 05:19:13:850PM	971219040	Robert Granetz	Shot 40 -- Plasma. Good shot. Ip=1.0 MA. ELMy H-mode. Prf=1.5 MW, but there were multiple dropouts. No lithium pellet. Bruce finally saw some argon in the divertor. End of run.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	07:54:32:030AM	Plasma	Ok
2	08:09:35:490AM	Plasma	Ok
3	08:22:46:590AM	Plasma	Ok
4	08:31:54:530AM	Plasma	Ok
5	09:04:09:070AM	Plasma	Ok
6	09:19:09:800AM	Plasma	Ok
7	09:30:29:480AM	Plasma	Ok
8	09:40:30:250AM	Plasma	Ok
9	09:51:53:100AM	Plasma	Ok
10	10:05:56:920AM	Plasma	Ok
11	10:19:32:890AM	Plasma	Ok
12	10:32:17:260AM	Plasma	Ok
13	10:44:13:380AM	Plasma	Ok
14	10:57:38:160AM	Plasma	Ok
15	11:09:48:130AM	Plasma	Ok
16	11:22:51:700AM	Plasma	Ok
17	11:32:08:900AM	Plasma	Ok
18	11:45:53:490AM	Plasma	Ok
19	11:57:06:390AM	Plasma	Ok
20	12:06:35:560PM	Plasma	Ok
21	12:15:48:130PM	Plasma	Ok
22	12:30:26:820PM	Plasma	Ok
23	12:45:35:850PM	Plasma	Ok
24	12:58:14:200PM	Plasma	Ok
25	01:14:15:120PM	Plasma	Ok
26	01:24:30:230PM	Plasma	Ok
27	01:36:55:350PM	Plasma	Ok
28	01:49:53:830PM	Plasma	Ok	no tf, no faults on tf summary
29	02:02:25:020PM	Plasma	Ok
30	02:15:53:810PM	Plasma	Ok
31	02:34:50:590PM	Plasma	Ok
32	02:47:01:440PM	Plasma	Ok
33	02:59:41:760PM	Plasma	Ok
34	03:18:04:720PM	Plasma	Ok
35	03:33:04:810PM	Plasma	Ok
37	04:17:18:010PM	Plasma	Ok
38	04:24:48:110PM	Plasma	Ok
39	04:40:05:790PM	Plasma	Ok
40	04:59:39:200PM	Plasma	Ok