Alcator C-Mod Run 1120208 Information

Miniproposals

Miniproposal: 683

Date Filed: 12/14/2011

Title: Operations with both ICRF and LHRF systems: effects on LH coupling

First Author: Cornwall Lau

Session Leader: Cornwall Lau (shots 1-29)

Operators
Session leader(s):	Cornwall Lau
Physics operator(s):	Greg Wallace
Engineering operator(s):	Sam Pierson,Gary Dekow,Bill Byford

Engineering Operator Run Comment
MP 683 - "Operations with both ICRF and LHRF systems: effects on LH coup

Session Leader Plans

Entered: Feb 7 2012 11:44:36:030AM

Author: Cornwall Lau

Session leader plan for run 1120208 (Wednesday, February 8, 2012)
MP 683 - "Operations with both ICRF and LHRF systems: effects on LH coupling", run 1 of 1.5?
C. Lau

Objectives:
- to figure out the difference between LHRF only and LHRF+ICRF operations with respect to LH coupling

Requested gas:
- ECDC overnight in deuterium
- Deuterium main ion plasmas
- Deuterium in Ninja

Requested systems:
- ICRF: D,E, J4 all required. Expected maximum of 1MW from each antenna. Start with D 500kW at .65-.85s, E 500kW at .9-1.1s, J4 500kW at 1.15-1.35s, D at 500kW from 1.45 to 1.5s.
- LH
    -LH Launcher position with respect to the limiters: start at 1-2 mm
    -LH Start time: .75 sec
    -LH Stop time: 1.25 sec
    -Phasing: 90 deg.
    -Net Power desired: 600 kW maximum, start with 300kW.
    -LH Run Duration: Full day
    -Waveform description: start with standard square pulse
- Cryopump (highly desirable)
- Ninja: expected puff into plasma at 1.4s. Expected to test effect of new gas capillaries in plasmas.

Requested Diagnostics:
- standard set of diagnostics necessary for plasma operations (e.g TCI, magnetics)
- SOL reflectometer: start with top horn
- LH Langmuir probes
- LH video camera
- Edge TS (desirable)

Run plan
- Target plasma is 1120127015 (USN). B0 at 5.4T all day. Change Ip to 600kA and nl04 demand to be 3e19m-2. Nl04, Enable cryopump. Enable ninja (C-D flipper) to puff into plasma at 1.4s. SOL reflectometer should be at top horn.
- Knobs that will be changed: goal is to scan for D+LH, E+LH, J+LH, and LH for a variety of different SOL density profiles and hence different LH coupling. Session leader wants to change only ICRF/LHRF power within a discharge. The other knobs will be changed between discharges. This is subject to change depending on results.
    - LH launcher location (1-2mm, 4-5mm, and 8-9mm behind plasma limiter). Other knobs below will be scanned first before changing LH launcher location.
    - nl04 demand from 3e19 to 8e19 m-2.
    - Ip from 600-1000 kA.
    - outer gap will be changed as necessary to optimize LH coupling
    - LHRF/ICRF power
    - Reflectometer horn location
    - If ninja shows some effect, gas puffing may be used for the expected low LH probe densities at LH launcher location of 8-9mm, and possibly 4-5mm behind plasma limiter.

"If have time" backup run plan
- Target plasma is 1120125010 (LSN strike point on the floor). H-modes will be attempted. LH launcher location will be moved to best location. Ninja and cryopump should be turned off. Change nl04 to 8e19 m-2. Ramp from 200kW to 800 kW of ICRF power in J antenna at .65s to .9s. Constant 800kW from .9to 1.4s. LH at 200kW at 1-1.2s, LH power at 600kW at 1.2-1.5s. Repeat with D and E.

Physics Operators Plans

Entered: Feb 7 2012 04:19:28:310PM

Author: Greg Wallace

-----------------
Engineering Setup
-----------------

Run begins at 09:00 and ends at 17:00

Power systems as on: 1120127015

Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid Enabled

Gas setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar Hybrid DISABLED (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3)
fill H-bottom with 15 psi D2 Hybrid DISABLED (PG5)
leave B-div as is Hybrid DISABLED (PG6)
leave H-div as is Hybrid DISABLED (PG7)
fill NINJA with 10 psi D2 DISABLED

Enable gate-valves and shutters: ECE, VUV, HiREX Sr, Xeus, Loeus
Leave z-bolo shutter as is (should be open)

Torvac gatevalve toggle (yes/no): no

Boronization(yes/no): no
Overnight ECDC (yes/no): yes
ICRF(yes/no): yes
LH(yes/no): yes
Cryopump (yes/no): yes
DNB (yes/no): yes

Vessel temperature: 35/35/35

------------------------------
ECDC Parameters (if requested)
------------------------------
gas and pressure: D2 at 2e-4 Torr
sweep: 44/45/103 cm
scan: 20/120 s

-----------------------------
Plasma setup
----------------------------

Begin with shot 1120127015 (5.4 T, 0.7 MA, USN).

Session Leader Summaries

Entered: Mar 8 2012 04:31:37:970PM

Author: Cornwall Lau

Session leader plan for run 1120208 (Wednesday, February 8, 2012)
MP 683 - "Operations with both ICRF and LHRF systems: effects on LH coupling" , run 1 of 1.5?
C. Lau

Objectives:
- to figure out the difference between LHRF only and LHRF+ICRF operations with respect to LH coupling

Summary

During this run day, the LH launcher location was changed from 1-4mm behind LH limiters, outer gaps from 6mm to 2cm, currents from 600-1000kA, and nl04 from 4e19 to 7e19. ICRF antenna location and order was also changed(see session leader comments). LH power kept constant at ~200kW for all discharges, except for shot 29. ICRF power was also kept constant at ~500kW throughout the day.

Despite the wide range of plasma parameters, the effect of the ICRF on LH coupling was quite consistent throughout the day. Compared to LH only operations, reflection coefficients increased considerably during LH+D operations, increased moderately during LH+E operations, and showed little effect during LH+J operation. It should be noted that the Langmuir probe densities generally rose when ICRF was turned on. This could be due a local ICRF effect, a typical global rise in nebar when ICRF is turned on, or possible errors in the automatic analysis routine under ICRF sheath rectification. The fact that the reflection coefficients did not correlate very well with the Langmuir probe densities need to be explored.

It should be noted that the LH launcher was always flush to the ICRF limiter or in front of the ICRF limiter. When the LH launcher is behind the ICRF limiter, the effect of ICRF is observed to be completely different. This needs to be tried. H-modes may need to be tried?

Notes
- We piggybacked the NINJA capillaries that were on B-C side in order to test local gas puffing and its possible effects on ICRF and LHRF coupling. Preliminary evidence at 10PSI of D2 indicate some change at nl04~5e19, and little to no change at nl04~7e19. (gas does not get in at high densities?). Will need to see on reflectometer.Speculation is that we need to increase the pressure (elapsed time?) for ICRF and/or LH coupling purposes. We should probably piggyback this more...
- SOL reflectometer started working at top horn on shot 6 (operator error)
- We need to try discharges when the LH launcher is behind ICRF limiters. We need to try H-modes.

Table Summary
For this table, units are unitless,1019m-3, MA, cm, mm behind plasma limiter, antenna order, %,%,%,%, 10^20 m-4
* denotes when LH trips and have significant trouble restarting (sometimes there is still enough usable data)

Shot# nebar (10e19 m-3) Ip (MA) outer gap (cm) LH location (mm) ICRF order LH Ref (%) LH+D Ref (%) LH+E Ref (%) LH+J Ref (%)
01 6-8 .6 1.8 3 D-E-J * * * *
03 4-6 .6 1.5 3 D-E-J * * * *
04 5-7 .6 1.4 3 E-D-J 37* 55* * 39
05 5-7 .6 1.4 2 E-D-J 22* 50 * 35
06 7-8 .6 1.4 2 J-E-D 26 41 37 32
07 8.. .6 1.4 2 J-D-E 27* 46* 33* 30*
08 10-11 .6 1.4 2 J-D-E * * * *
09 10-11 .6 2 2 J-D-E * 38* * 24
10 8-9 .6 1.9 1 J-D-E 26 40 38 26
11 8-9 .8 1.9 1 J-D-E * * * *
12 8-9 .8 1.5 1 J-E-D 25 55 48 26
13 8-9 .8 1.2 1 J-E-D 23 51 42 28
14 8-9 .8 .9 1 E-D-J 28 46 34 26
15 8-9 1 .9 1 E-D-J 13 35 24* 12
25 7-9 1 .6 4 E-D-J no data no data no data no data
26 7-9 1 .6 4 E-D-J 41 59* 43 38
27 7-9 8 .6 4 E-D-J 41 53 42 35
28 10-12 1 .6 4 E-D-J 33 52 32 30
29 10-12 1 .6 4 E-D-J * 45 35* *

Physics Operator Summaries

Entered: Feb 8 2012 05:27:10:743PM

Author: Greg Wallace

PO Summary for 1120208
No problems in the morning. Startup was good through shot 15 based on segment 1 from 1120207032. Starting of shot 16 we had a string of fizzles lasting until shot 25. Techniques attempted to eliminate the fizzle included increasing the prefill, decreasing the prefill, and tweaking EF4. Finally the cryopump was turned off. Starting on shot 25 the startup was good again through the end of the run on shot 29.

Session Leader Comments

Feb 8 2012 09:23:26:693AM 1120208001 Cornwall Lau Plan:
Target plasma is 1120127015 (USN). B0=5.4T, Ip=600kA,nl04=3e19m-2. Enable cryopump. LH at 300kW from .75 to 1.25s. Launcher at 3mm. Order of ICRF (all at 500kW) is D (.65-.85s),E (.9-1.1s),J4 (1.15-1.35s),D (1.45-1.5s)

Result:
plasma all the way through. no LH power.

Next:
chnage ICRF timing D (.6 to .8s), J4( 1.2 to 1.4s)
LH is going to adjust their phasing on their klystrons to optimize.
outer gap is decreasing 2mm to hopefully raise Langmuir probe densities.
Amanda noticed Bt was flattop until 2s. flatop adjusted to 1.5s

Feb 8 2012 09:25:47:607AM 1120208002 Cornwall Lau Plan:
chnage ICRF timing D (.6 to .8s), J4( 1.2 to 1.4s)
LH is going to adjust their phasing on their klystrons to optimize.
outer gap is decreasing 2mm to hopefully raise Langmuir probe densities.
Amanda noticed Bt was flattop until 2s. flatop adjusted to 1.5s

Result:
early disruption

Next:
repeat

Feb 8 2012 10:26:32:217AM 1120208003 Cornwall Lau Plan:
repeat

Result:
disruption at ~.96. no LH during the pulse due to low langmuir probe densities probably

Next:
repeat with nl04 demand raised from .3e20 to .4e20. switch order to E,D,J

Feb 8 2012 10:06:59:877AM 1120208004 Cornwall Lau Plan:
repeat with nl04 demand raised from .3e20 to .4e20

Result:
plasma all the way through. LH tripped a lot (langmuir probe density still low).

Next:
Move LH launcher in to 2mm. repeat.

Feb 8 2012 10:24:16:027AM 1120208005 Cornwall Lau Plan:
Move LH launcher in to 2mm. repeat.

Result:
plasma. LH still tripping a bit, but there's data for D+LH, E+LH, J+LH.

Next:
raise nlo4 to 5e19. switch order to J,E,D.

Feb 8 2012 10:38:47:653AM 1120208006 Cornwall Lau Plan:
raise nlo4 to 5e19. switch order to J,E,D.

Result:
good shot. LH tripped once at the end in D-port. got LH, D+LH, E+LH, J+LH data. ninja fired. Got some data (look at video cameras). Steve (Wukitch) has command right now and will play around with it.

Next:
repeat with 50ms instaed of 100ms gap between ICRF antennas. change order to J, D,E

Feb 8 2012 10:49:32:443AM 1120208007 Cornwall Lau Plan:
repeat with 50ms instaed of 100ms gap between ICRF antennas. change order to J, D,E

Result:
plasma. LH trips a lot, but got some data for this.

Next:
raise nl04 to 7e19.

Feb 8 2012 11:03:49:610AM 1120208008 Cornwall Lau Plan:
raise nl04 to 7e19.

Result:
plasma. lots of LH trips. not much usable data.

Next:
increase outer gap by 6mm.

Feb 8 2012 11:17:13:740AM 1120208009 Cornwall Lau Plan:
increase outer gap by 6mm.

Result:
plasma, but no usable LH data.

Next:
Decrease nl_04 from 0.7e20 to 0.5e20. Move LH position from 2mm behind GH to 1 mm behind GH.

Feb 8 2012 11:29:08:930AM 1120208010 Cornwall Lau Plan:
Decrease nl_04 from 0.7e20 to 0.5e20. Move LH position from 2mm behind GH to 1 mm behind GH.

Result:
good plasma, good data.

Next:
change current to 800kA (mapping). ICRF pulse after 1.4s is back on.

Feb 8 2012 11:50:47:320AM 1120208011 Cornwall Lau Plan:
change current to 800kA (mapping). ICRF pulse after 1.4s is back on.

Result:
good plasma. changing the current lower the langmuir probe density and seems to create too high reflection coefficients.

Next:
reduce outer gap by 6mm. order is J,E,D

Feb 8 2012 11:54:53:467AM 1120208012 Cornwall Lau Plan:
reduce outer gap by 6mm. order is J,E,D

Result:
good plasma, good data.

Next:
reduce outer gap by 4 more mm. want a bit more data at higher LH langmuir probe densities. added D ICRF at 1.45 to 1.5s to see if anything happens with the gas puff.

Feb 8 2012 12:07:15:673PM 1120208013 Cornwall Lau Plan:
reduce outer gap by 4 more mm. want a bit more data at higher LH langmuir probe densities.

Result:
plasma, injection caused disruption during plasma ramp down. got good plasma data.
Next:
reduce outer gap by 4 more mm. want a bit more data at higher LH langmuir probe densities. switch order of antennas to E,D,J

Feb 8 2012 12:28:22:113PM 1120208014 Cornwall Lau Plan:
reduce outer gap by 4 more mm. want a bit more data at higher LH langmuir probe densities. switch order of antennas to E,D,J

Result:
good plasma, disruption in ramp down again. good data for this MP

Next:
change current to 1MA.

Feb 8 2012 12:36:23:810PM 1120208015 Cornwall Lau Plan:
change current to 1MA.

Result:
good plasma, disruption just before ramp down. got plasma data.

Next:
reduce outer gap by 4mm. move LH launcher from 1mm behind GH limiter to 4mm behind GH limiter.

Feb 8 2012 12:41:39:533PM 1120208016 Cornwall Lau Plan:
reduce outer gap by 4mm. move LH launcher from 1mm behind GH limiter to 4mm behind GH limiter.

Result:
fizzle

Next:
repeat

Feb 8 2012 12:56:33:167PM 1120208017 Cornwall Lau Plan:
repeat

Result:
fizzle

Next:
repeat

Feb 8 2012 01:34:51:360PM 1120208018 Cornwall Lau Plan:
repeat

Result:
another fizzle

Next:
repeat

Feb 8 2012 01:34:58:760PM 1120208019 Cornwall Lau Plan:
repeat

Result:
another fizzle

Next:
repeat

Feb 8 2012 01:48:13:357PM 1120208020 Cornwall Lau Plan:
repeat

Result:
fizzle

Next:
repeat

Feb 8 2012 02:04:13:023PM 1120208021 Cornwall Lau Plan:
repeat

Result:
fizzle

Next:
repeat

Feb 8 2012 03:11:46:393PM 1120208022 Cornwall Lau Plan:
repeat

Result:
fizzle

Next:
repeat. it's a bit early for groundhog day... cryopump will be turned off.

Feb 8 2012 03:18:09:180PM 1120208023 Cornwall Lau Plan:
repeat

Result:
fizzle

Next:
repeat

Feb 8 2012 03:32:02:970PM 1120208024 Cornwall Lau Plan:
repeat

Result:
fizzle

Next:
repeat

Feb 8 2012 03:51:55:360PM 1120208025 Cornwall Lau Plan:
repeat

Result:
plasma! no LH

Next:
repeat with LH

Feb 8 2012 04:20:42:270PM 1120208026 Cornwall Lau Plan:
repeat with LH

Result:
plasma. good data with LH

Next:
drop current to 800kA

Feb 8 2012 04:37:59:817PM 1120208027 Cornwall Lau Plan:
drop current to 800kA

Result:
good plasma. good data

Next:
change current back to 1MA. change nl04 from 5e19 to 6.5e19.

Feb 8 2012 04:52:49:657PM 1120208028 Cornwall Lau Plan:
change current back to 1MA. change nl04 from 5e19 to 6.5e19.

Result:
got plasma. got good data for this MP

Next:
raise LH power

Feb 8 2012 05:02:51:887PM 1120208029 Cornwall Lau Plan:
raise LH power

Result:
got plasma. decent amount of LH tripping, but data was achieved.

Next:
last shot of the day.

Physics Operator Comments

Feb 8 2012 09:22:34:320AM 1120208001 Greg Wallace Changes: Load seg 1 from shot -1 (2012 cryopump setup). Load seg 2 and 3 (active) from 1120127015. Change seg 3 Ip to 600 kA and nl_04 to 3e19.

Result: Plasma through rampdown. LH faulted on all restrikes. Density on LH probes is extremely low with outer gap of 1.8cm and launcher 3.5mm behind GH limiter.

Next shot: Try again. Increase time between ICRF pulses. Adjust for phase drift in LH control system. Increase RCUR by ~1mm to decrease outer gap by ~2mm. Start TF rampdown at 1.75 s for Amanda.

Feb 8 2012 09:33:53:753AM 1120208002 Greg Wallace Changes: Try again. Increase time between ICRF pulses. Adjust for phase drift in LH control system. Increase RCUR by ~1mm to decrease outer gap by ~2mm. Start TF rampdown at 1.75 s for Amanda.

Result: Disruption at 0.315 s. Something fell in?

Next shot: Try again.

Feb 8 2012 09:59:41:270AM 1120208003 Greg Wallace Changes: Try again. No DPCS changes.

Result: Disruption at 0.96 s. Another injection, I think. Cell access for DNB.

Next shot: Increase nl_04 programming from 0.3e20 to 0.4e20.

Feb 8 2012 10:08:14:747AM 1120208004 Greg Wallace Changes: Increase nl_04 programming from 0.3e20 to 0.4e20.

Result: Plasma through rampdown. Many LH trips but the later part of the pulse made it through. Increasing density seemed to help a bit.

Next shot: Move LH launcher from 3.65 mm behind GH to 2.0 mm behind GH limiter. No DPCS changes.

Feb 8 2012 10:23:03:083AM 1120208005 Greg Wallace Changes: Move LH launcher from 3.65 mm behind GH to 2.0 mm behind GH limiter. No DPCS changes.

Result: Plasma through rampdown. LH reflection coefficient goes up from ~20% to ~50% when D-port turns on. Interestingly the LH stays on the best during D-port??? Cell access for Cornwall.

Next shot: Increase nl_04 to 0.5e20 in seg 3.

Feb 8 2012 10:34:31:403AM 1120208006 Greg Wallace Changes: Increase nl_04 to 0.5e20 in seg 3.

Result: Plasma through rampdown. Clear increase in LH reflection coeff with ICRF power.

Next shot: Move ICRF pulses closer together. No DPCS changes.

Feb 8 2012 10:54:25:213AM 1120208007 Greg Wallace Changes: Move ICRF pulses closer together. No DPCS changes.

Result: Plasma through rampdown. More LH trips this time.

Next shot: Enable PG1 (B side lower) Ar puff, 70 ms. Increase nl_04 from 0.5e20 to 0.7e20.

Feb 8 2012 11:08:29:540AM 1120208008 Greg Wallace Changes: Enable PG1 (B side lower) Ar puff, 70 ms. Increase nl_04 from 0.5e20 to 0.7e20.

Result: Plasma through rampdown. LH faulting continuously. Looks on the reflected power like breakdown on plasma side.

Next shot: Reduce RCUR from .659 to .656 (increase outer gap by 6mm).

Feb 8 2012 11:15:14:330AM 1120208009 Greg Wallace Changes: Reduce RCUR from .659 to .656 (increase outer gap by 6mm).

Result: Plasma through rampdown. Many LH trips, looks like more breakdown on plasma side. Antenna doesn't seem to like the high line averaged density/neutral pressure.

Next shot: Decrease nl_04 from 0.7e20 to 0.5e20. Move LH position from 3mm behind GH to 2 mm behind GH.

Feb 8 2012 11:29:27:343AM 1120208010 Greg Wallace Changes: Decrease nl_04 from 0.7e20 to 0.5e20. Move LH position from 3mm behind GH to 2 mm behind GH.

Result: Plasma through rampdown. Much better LH pulse with lower density and closer launcher position.

Next shot: Increase Ip to 800 kA.

Feb 8 2012 11:44:33:913AM 1120208011 Greg Wallace Changes: Increase Ip to 800 kA.

Result: Plasma through rampdown. Poor LH coupling on this shot, looks like high refco is the culprit.

Next shot: Decrease outer gap by 6mm (increase RCUR from 0.656 to 0.659). Switch ICRF antenna order.

Feb 8 2012 11:55:39:283AM 1120208012 Greg Wallace Changes: Decrease outer gap by 6mm (increase RCUR from 0.656 to 0.659). Switch ICRF antenna order.

Result: Plasma through rampdown. Much better LH with smaller gap.

Next shot: Decrease outer gap by 4mm (increase RCUR from 0.659 to 0.661).

Feb 8 2012 12:07:12:027PM 1120208013 Greg Wallace Changes: Decrease outer gap by 4mm (increase RCUR from 0.659 to 0.661).

Result: Disruption in rampdown. Clean LH pulse. Reflections highest with D-port, then E-port, then J-port, then LH only.

Next shot: Decrease outer gap by another 4mm (increase RCUR from 0.661 to 0.663).

Feb 8 2012 12:22:10:733PM 1120208014 Greg Wallace Changes: Decrease outer gap by another 4mm (increase RCUR from 0.661 to 0.663).

Result: Plasma disrupts in rampdown. Breakdown on top row of LH launcher at 1.15 s causes a fault. One early fault due to high reflections?

Next shot: Increase Ip to 1.0 MA.

Feb 8 2012 12:38:12:670PM 1120208015 Greg Wallace Changes: Increase Ip to 1.0 MA.

Result: Disruption at 1.47 s. Pretty good LH with very low reflections during J and with no ICRF, high reflections during E and especially D.

Next shot: Decrease outer gap by another 4mm (increase RCUR from 0.663 to 0.665) Move LH launcher to ~4 mm behind GH limiter.

Feb 8 2012 12:50:04:860PM 1120208016 Greg Wallace Changes: Decrease outer gap by another 4mm (increase RCUR from 0.663 to 0.665) Move LH launcher to ~4 mm behind GH limiter.

Result: Fizzle. Breakdown is a little later than on shot 15. Bounces at ~13 ms, big spike in CIII and H-alpha. Fields and pressure look good.

Next shot: Try again. Might be a post-disruption fizzle? No DPCS changes.

Feb 8 2012 01:06:39:900PM 1120208017 Greg Wallace Changes: Try again. Might be a post-disruption fizzle? No DPCS changes.

Result: Fizzle again. Datasystem seems stuck.

Next shot: Increase PG4 prepuff from 30 ms to 36 ms to see if that fixes bounce.

Feb 8 2012 01:18:58:153PM 1120208018 Greg Wallace Changes: Increase PG4 prepuff from 30 ms to 36 ms to see if that fixes bounce.

Result: Another fizzle. No bounce this time but late breakdown that never really took off.

Next shot: Reduce PG4 prepuff from 36 to 33 ms.

Feb 8 2012 01:47:13:890PM 1120208019 Greg Wallace Changes: Reduce PG4 prepuff from 36 to 33 ms.

Result: Another fizzle.

Next shot: Decrease PG4 prepuff from 33 to 30 ms.

Feb 8 2012 01:58:41:877PM 1120208020 Greg Wallace Changes: Reduce PG4 prepuff from 33 to 30 ms.

Result: Fizzle again.

Next shot: Reduce PG4 prepuff from 30 to 27 ms.

Feb 8 2012 02:07:53:310PM 1120208021 Greg Wallace Changes: Reduce PG4 prepuff from 30 to 27 ms.

Result: Closer, but still a fizzle. Breakdown is slightly late.

Next shot: ECDC for 20 min before the next shot. Change IC_EF4U from -1310 to -1320 at t=0 to decrease Bz0.

Feb 8 2012 03:13:39:350PM 1120208022 Greg Wallace Changes: ECDC for 20 min before the next shot. Change IC_EF4U from -1310 to -1320 at t=0 to decrease Bz0.

Result: Fizzle again despite ECDC. Current never ramped up.

Next shot: Turn off cryopump. Reduce PG4 prepuff from 27 to 13 ms to account for lack of cryopump.

Feb 8 2012 03:18:06:103PM 1120208023 Greg Wallace Changes: Turn off cryopump. Reduce PG4 prepuff from 27 to 13 ms to account for lack of cryopump.

Result: Fizzle again!??!

Next shot: Reduce PG4 prepuff again, this time from 13 to 10 ms.

Feb 8 2012 03:36:57:380PM 1120208024 Greg Wallace Changes: Reduce PG4 prepuff again, this time from 13 to 10 ms.

Result: Fizzle.

Next shot: Reduce early PG3 puff.

Feb 8 2012 03:54:47:657PM 1120208025 Greg Wallace Changes: Reduce early PG3 puff.

Result: Plasma through rampdown!!! No LH due to TPS CNTRLX fault (lost communication with active control system).

Next shot: Repeat. No DPCS changes.

Feb 8 2012 04:19:32:250PM 1120208026 Greg Wallace Changes: Repeat. No DPCS changes.

Result: Plasma through rampdown. Good shot! LH worked on this shot.

Next shot: Reduce Ip to 800 kA.

Feb 8 2012 04:39:08:263PM 1120208027 Greg Wallace Changes: Reduce Ip to 800 kA.

Result: Plasma through rampdown. LH looks better after adjusting for phase drift.

Next shot: Increase nl_04 demand to 6.5e19. Increase Ip to 1.0MA.

Feb 8 2012 04:52:27:847PM 1120208028 Greg Wallace Changes: Increase nl_04 demand to 6.5e19. Increase Ip to 1.0MA.

Result: Plasma through rampdown. A few early LH faults then ran clean for the rest of the pulse.

Next shot: No DPCS changes. Double LH power to 120 kW/klystron.

Feb 8 2012 05:23:06:070PM 1120208029 Greg Wallace Changes: No DPCS changes. Double LH power to 120 kW/klystron.

Result: Plasma through rampdown. Last shot of the day.

Engineering Operator Comments

Shot Time Type Status Comment

1 09:00:12:450AM Plasma Ok

2 09:23:05:593AM Plasma Ok

3 09:38:50:347AM Plasma Ok

4 09:57:20:770AM Plasma Ok

5 10:10:09:923AM Plasma Ok

6 10:26:17:470AM Plasma Ok

7 10:39:08:557AM Plasma Ok

8 10:51:50:327AM Plasma Ok

9 11:06:35:390AM Plasma Ok

10 11:19:17:850AM Plasma Ok

11 11:32:30:723AM Plasma Ok

12 11:46:11:917AM Plasma Ok

13 11:59:04:027AM Plasma Ok

14 12:11:53:157PM Plasma Ok

15 12:25:12:560PM Plasma Ok

16 12:39:12:737PM Plasma Ok

17 12:52:05:117PM Plasma Ok

18 01:07:47:773PM Plasma Ok

19 01:31:51:970PM Plasma Ok

20 01:44:51:530PM Plasma Ok

21 01:59:56:773PM Plasma Ok

22 03:01:25:310PM Plasma Ok

23 03:14:24:257PM Plasma Ok

24 03:27:56:447PM Plasma Ok

25 03:44:59:337PM Plasma Ok

26 04:12:19:453PM Plasma Ok

27 04:30:03:883PM Plasma Ok

28 04:42:43:557PM Plasma Ok

29 04:55:46:960PM Plasma Ok

System Availability

Feb 8 2012 07:08:30:790AM

Unforeseen circumstances limited the amount of time ECDC was operated to 1 hour and 10 minutes.

Feb 8 2012 08:59:53:830AM

System Available Comment Availability
Changed Owner Description Who Can
Change
Active MHD no secured - tagged out Jun 02 2008 11:03AM (sears) Joe Snipes Active MHD Antenna golfit
BES yes BES system is online Nov 22 2011 02:21PM (bespam) Bill Rowan Beam Emission Spectroscopy bespam,liao,rowan
Bolometers yes Midplane and LEDGE-AX diodes functioning properly. Midplane bolometers working and calibrated. LEDGE/DIV bolometers working, but toaster calibration not yet complete. Jan 23 2012 12:02PM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization no Bottle Removed. System has been tested and will be ready once bottle is installed Jan 09 2012 06:32AM (dekow) Jim Irby Boronization dekow,irby
CECE no Jan 06 2012 03:48PM Anne White Correlation ECE whitea
CNPA yes Multiple channel CNPA available, no safety risk for in-vessel access Apr 14 2011 12:01PM (parker) Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor yes Operational. He level meter not working on 500L dewar. Frank will take manual readings. Jan 11 2012 11:46AM (labombard) Brian LaBombard Upper Divertor Cryopump dekow,irby,labombard
CXRS yes core-CXRS system is online Nov 22 2011 02:21PM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,liao,rachmcd,rowan
CXRS edge yes Michael CHurchill has primary responsibility at the moment Apr 19 2011 11:44AM (blip) Bruce Lipshultz Measurement of CXR light in the pedestal region at both the high- and low-field sides blip,rmchurch
D Alpha yes \ha2_bright is available; \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 is not available Jul 01 2009 09:45AM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa no system is is installed and aligned, but not functional (appears to be a broken cable) Dec 05 2011 02:41PM (marmar) Earl Marmar Visible Bremsstrahlung Imaging marmar
Disruption Mitigation no gas jet valve disabled on 2011/04/13 Apr 13 2011 02:04PM (granetz) Robert Granetz Gas Jet granetz,whyte
Divertor IR no Mar 06 2007 10:50AM Glen Wurden Divertor IR Digital Video gwurden,terry
Divertor IR Spectroscopy no Mar 06 2007 10:51AM Glen Wurden Divertor IR Spectroscopy gwurden,terry
DMBolo AXUV diodes yes Diodes are taking usable data. Not all post-processing code is working yet. Feb 01 2012 01:24PM (golynyk) Geoff Olynyk Set of six AXUV diodes in a toroidal array of midplane wall boxes. golynyk,granetz,mlreinke,whyte
DNB yes Dec 01 2011 11:46AM (granetz) Robert Granetz Diagnostic Neutral Beam dterry,granetz,mochung
ECDC yes Operational as of 11/19/11 Nov 22 2011 03:01PM (irby) Jim Irby 2.45 GHz, 3 kW, discharge cleaning system dekow,irby,pfeiffer
FRC-ECE no Power off to RF and IF sections- Power on to DA Apr 11 2011 02:54PM (phillips) Perry Phillips Heterodyne ECE-32 channels bespam,liao,phillips,rowan,whitea
FTCI no Jan 06 2012 04:36PM Jim Irby Fast two-color interferometer irby
G-Side Ratiomatic yes Dec 02 2011 12:24PM (toland) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
Glow Discharge no Power supply unplugged and redtagged, HV cables removed Apr 14 2011 08:03AM (dekow) Jim Irby 1 kV, 5 A, glow discharge system dekow,dterry,irby
GPC yes Using new preamps. Nov 30 2011 07:51AM (hubbard) Amanda Hubbard ECE Polychromater hubbard
GPC2 yes Dewar cold. Nov 21 2011 09:55AM (hubbard) Amanda Hubbard ECE Polychromater hubbard
GPI yes The Xpt-view, the midplane-view cameras are operational. The innerwall GPI (coupled to the fast-diodes) is available. Jul 01 2009 09:45AM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes system is functional and taking data Dec 05 2011 02:42PM (marmar) Earl Marmar H/D Ratio marmar
HEAT yes Jan 09 2012 06:32AM (dekow) Gary Dekow - Machine Heaters - burke,dekow
Hirex Jr yes Hirex-Jr has been installed Jun 28 2010 03:36PM (rice) John Rice High Resolution X-Ray ince,rice
Hirex Sr yes Installed and aligned. Will be available for Ti/Vr profiles after focusing tests and locked modes are taken. Dec 06 2011 08:21AM (ypodpaly) John Rice High Resolution X-Ray cgao,ldelgado,rice,ypodpaly
HXR yes 32 Channels operational,, no safety risk for in-vessel access Apr 14 2011 12:05PM (parker) Ron Parker Hard X-Ray Array faust,parker,schmidt
ICRF D-Antenna no secured Apr 14 2011 08:55AM (wukitch) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna no secured Apr 14 2011 08:55AM (wukitch) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna no secured Apr 14 2011 08:56AM (wukitch) Steve Wukitch J-port antenna wukitch,ylin
Impurity Spectroscopy yes Being upgraded with better optics and new spectrographs. Dan Miller has primary responsibility. Apr 19 2011 11:46AM (blip) Bruce Lipshultz Measurement of recycling light and impurity source rates at multiple surfaces around the tokamak blip,miller
Laser Blow-Off yes Operational and tested Jan 06 2012 03:50PM (g) Martin Greenwald Impurity Injection System g,nthoward
Lower Hybrid no LH HV Breaker Opened and Tagged, TPS Upgrade Underway Nov 10 2011 03:51PM (dterry) Ron Parker Lower Hybrid dterry,parker,wallaceg
Lower Hybrid Reflectometer no off Apr 15 2011 08:24AM (dominguez) Arturo Dominguez Lower Hybrid Reflectometer dominguez,marmar,parker,sgbaek
LoWEUS yes LoWEUS viewing the 10-30 nm region, spectral brightness vs. lambda and time are being stored in tree. Jan 23 2012 12:03PM (mlreinke) Matthew L. Reinke Long Wavelength Extreme Ultraviolet Spectrometer markchil,mlreinke
LPI no Beam line removed May 30 2008 02:09PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha yes Midplane Lyman-a and LEDGE-LY working normally. New B-PORT Lyman (BPLY) still being debugged. Jan 23 2012 12:04PM (mlreinke) Matt Reinke Lyman alpha cameras faustian,labombard,mlreinke
Magnetics yes Dec 01 2011 11:51AM (g) Robert Granetz Bp coils and flux loops for equilibrium control granetz,wolfe
McPherson no **vacuum system problem*** McPherson viewing the 10-14 nm region for molybdenum monitoring. It's days are numbered as LoWEUS has demonstrated superiority. Jan 31 2012 08:15AM (mlreinke) Jim Terry VUV Spectrometer markchil,mlreinke,terry
Michelson yes Front end at 4.5e-8 T. Reduced speed for initial operation. Nov 30 2011 07:51AM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt
MKS yes Dec 02 2011 12:27PM (toland) Brian LaBombard Baratron pressure gauges labombard,toland
MLP no System is in edge lab. Version 2 drivers ready to test. Needs a student to help work on it. Jul 14 2009 09:20PM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard
MSE no 1/3/2011: push-pull mechanism broken. MSE inoperative Jan 03 2012 11:47AM (sscott) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes High voltage is on. We're ready for plasma. Nov 21 2011 12:58PM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes All detectors Powered On --- Waiting for neutrons for calibration Nov 22 2011 01:05PM (irby) Jim Irby X-Ray/Neutron Detectors at K-Hor irby
NINJA yes C-bottom and new F-bottom system ready. Dec 02 2011 12:28PM (toland) Brian LaBombard NINJA gas puff labombard,terry,toland
PCI yes Operational. Nov 30 2011 12:45PM (ntsujii) Miklos Porkolab Phase Contrast Imaging emd,ennever,ntsujii,porkolab
Penning Gauges yes Operational. High voltage comes on during INIT and off at RECOOL. Dec 09 2011 09:48AM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational. Jul 01 2009 09:46AM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe
Polarimeter yes 3 chords operational but with high noise level Jan 06 2012 04:22PM (irby) Jim Irby C-Mod Polarimeter irby
Power - Alternator Air Switch yes Jan 09 2012 06:33AM (dekow) Gary Dekow feeds all the other supplies cochran,dekow,dterry,irby
Power - PEI yes Jan 09 2012 06:33AM (dekow) Gary Dekow PEI System cochran,dekow,dterry,irby
Power - TMX yes Jan 09 2012 06:33AM (dekow) Gary Dekow Ef2s,. EFCs and A-Coils byford,cochran,dekow,dterry,irby
Power Systems yes Jan 09 2012 06:33AM (dekow) Jim Irby C-Mod Magnet Supplies byford,cochran,dekow,dterry,irby
Probe Array - ISD yes Operational, except for probe #1 (open circuit) and probe #16 (not installed). Dec 09 2011 09:50AM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH yes Operational, except for bottom-D probe (open circuit). Dec 09 2011 09:52AM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes F-divertor ok. J-divertor ok, except for JDIV_06 which is shorted out. Dec 09 2011 09:54AM (labombard) Brian LaBombard Outer Lower Divertor Probe Array (F and J) labombard
Probe Array - UDIV yes Operational except for probes #4, 5 and 13 (open) Dec 09 2011 09:56AM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer yes As of 1120105xxx, all channels are connected Jan 05 2012 09:14AM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Ion Sensitive Probe head installed. Testing in piggy-back mode. Dec 20 2011 12:33PM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP yes Operational. Dec 09 2011 09:57AM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP yes A-port WASP is operational. K-port WASP is dead (all probes melted together). Dec 09 2011 09:58AM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
Shoelace Antenna yes Fixed frequency operation available (100kHz) at moderate power (< 0.5kW). Otherwise in receiver mode. Jan 11 2012 11:50AM (labombard) Brian LaBombard High-k active MHD antenna, for QCM, WCM studies golfit,labombard
SOL reflectometer yes c-port waveguides operational, h-port waveguides are not. Nov 29 2011 12:04PM (cornwall) Cornwall Lau SOL reflectometer cornwall,wukitch,ylin
Sparker yes New Type II sparker replaced Type I on 11/17/2011 Nov 23 2011 08:53AM (irby) Jim Irby Field Emission Preionization for C-Mod dekow,irby,parkin
Surface Science Station no SSS is up to air, no safety issues Apr 14 2011 12:06PM (ochoukov) Bruce Lipschultz Radially scanning probe located on K-port blip,ochoukov
TCI yes TCI Operational. Density feedback operational. Nov 10 2011 11:47AM (irby) Jim Irby Two-Color Interferometer irby,murray
TS - Core yes Operating with two 50Hz lasers, precise density calibration still required. Feb 03 2012 04:04AM (jwhughes) Jerry Hughes Core Thomson scattering jrwalk,jwhughes,yma
TS - Edge yes System taking data. Requires calibration. Feb 03 2012 04:05AM (jwhughes) Jerry Hughes Millimeter resolution edge Thomson scattering jrwalk,jwhughes,yma
Vispec no 350 and 670 nm, 4 spatial channels Nov 28 2007 09:58AM (agraf) Alex Graf Visible Spectrometer agraf
XEUS yes XEUS viewing the 1-6 nm region, spectral brightness vs. lambda and time are being stored in tree. Jan 23 2012 12:13PM (mlreinke) Matt Reinke X-ray Extended Ultraviolet Spectrometer markchil,mlreinke
XTOMO yes ARRAY1->4 working normally, ARRAY5 (new core view) working but spatial calibration issues not yet resolved Jan 23 2012 12:13PM (mlreinke) Robert Granetz X-Ray Tomography faustian,granetz,mlreinke

Session Leader Comments
Feb 8 2012 09:23:26:693AM	1120208001	Cornwall Lau	Plan: Target plasma is 1120127015 (USN). B0=5.4T, Ip=600kA,nl04=3e19m-2. Enable cryopump. LH at 300kW from .75 to 1.25s. Launcher at 3mm. Order of ICRF (all at 500kW) is D (.65-.85s),E (.9-1.1s),J4 (1.15-1.35s),D (1.45-1.5s) Result: plasma all the way through. no LH power. Next: chnage ICRF timing D (.6 to .8s), J4( 1.2 to 1.4s) LH is going to adjust their phasing on their klystrons to optimize. outer gap is decreasing 2mm to hopefully raise Langmuir probe densities. Amanda noticed Bt was flattop until 2s. flatop adjusted to 1.5s
Feb 8 2012 09:25:47:607AM	1120208002	Cornwall Lau	Plan: chnage ICRF timing D (.6 to .8s), J4( 1.2 to 1.4s) LH is going to adjust their phasing on their klystrons to optimize. outer gap is decreasing 2mm to hopefully raise Langmuir probe densities. Amanda noticed Bt was flattop until 2s. flatop adjusted to 1.5s Result: early disruption Next: repeat
Feb 8 2012 10:26:32:217AM	1120208003	Cornwall Lau	Plan: repeat Result: disruption at ~.96. no LH during the pulse due to low langmuir probe densities probably Next: repeat with nl04 demand raised from .3e20 to .4e20. switch order to E,D,J
Feb 8 2012 10:06:59:877AM	1120208004	Cornwall Lau	Plan: repeat with nl04 demand raised from .3e20 to .4e20 Result: plasma all the way through. LH tripped a lot (langmuir probe density still low). Next: Move LH launcher in to 2mm. repeat.
Feb 8 2012 10:24:16:027AM	1120208005	Cornwall Lau	Plan: Move LH launcher in to 2mm. repeat. Result: plasma. LH still tripping a bit, but there's data for D+LH, E+LH, J+LH. Next: raise nlo4 to 5e19. switch order to J,E,D.
Feb 8 2012 10:38:47:653AM	1120208006	Cornwall Lau	Plan: raise nlo4 to 5e19. switch order to J,E,D. Result: good shot. LH tripped once at the end in D-port. got LH, D+LH, E+LH, J+LH data. ninja fired. Got some data (look at video cameras). Steve (Wukitch) has command right now and will play around with it. Next: repeat with 50ms instaed of 100ms gap between ICRF antennas. change order to J, D,E
Feb 8 2012 10:49:32:443AM	1120208007	Cornwall Lau	Plan: repeat with 50ms instaed of 100ms gap between ICRF antennas. change order to J, D,E Result: plasma. LH trips a lot, but got some data for this. Next: raise nl04 to 7e19.
Feb 8 2012 11:03:49:610AM	1120208008	Cornwall Lau	Plan: raise nl04 to 7e19. Result: plasma. lots of LH trips. not much usable data. Next: increase outer gap by 6mm.
Feb 8 2012 11:17:13:740AM	1120208009	Cornwall Lau	Plan: increase outer gap by 6mm. Result: plasma, but no usable LH data. Next: Decrease nl_04 from 0.7e20 to 0.5e20. Move LH position from 2mm behind GH to 1 mm behind GH.
Feb 8 2012 11:29:08:930AM	1120208010	Cornwall Lau	Plan: Decrease nl_04 from 0.7e20 to 0.5e20. Move LH position from 2mm behind GH to 1 mm behind GH. Result: good plasma, good data. Next: change current to 800kA (mapping). ICRF pulse after 1.4s is back on.
Feb 8 2012 11:50:47:320AM	1120208011	Cornwall Lau	Plan: change current to 800kA (mapping). ICRF pulse after 1.4s is back on. Result: good plasma. changing the current lower the langmuir probe density and seems to create too high reflection coefficients. Next: reduce outer gap by 6mm. order is J,E,D
Feb 8 2012 11:54:53:467AM	1120208012	Cornwall Lau	Plan: reduce outer gap by 6mm. order is J,E,D Result: good plasma, good data. Next: reduce outer gap by 4 more mm. want a bit more data at higher LH langmuir probe densities. added D ICRF at 1.45 to 1.5s to see if anything happens with the gas puff.
Feb 8 2012 12:07:15:673PM	1120208013	Cornwall Lau	Plan: reduce outer gap by 4 more mm. want a bit more data at higher LH langmuir probe densities. Result: plasma, injection caused disruption during plasma ramp down. got good plasma data. Next: reduce outer gap by 4 more mm. want a bit more data at higher LH langmuir probe densities. switch order of antennas to E,D,J
Feb 8 2012 12:28:22:113PM	1120208014	Cornwall Lau	Plan: reduce outer gap by 4 more mm. want a bit more data at higher LH langmuir probe densities. switch order of antennas to E,D,J Result: good plasma, disruption in ramp down again. good data for this MP Next: change current to 1MA.
Feb 8 2012 12:36:23:810PM	1120208015	Cornwall Lau	Plan: change current to 1MA. Result: good plasma, disruption just before ramp down. got plasma data. Next: reduce outer gap by 4mm. move LH launcher from 1mm behind GH limiter to 4mm behind GH limiter.
Feb 8 2012 12:41:39:533PM	1120208016	Cornwall Lau	Plan: reduce outer gap by 4mm. move LH launcher from 1mm behind GH limiter to 4mm behind GH limiter. Result: fizzle Next: repeat
Feb 8 2012 12:56:33:167PM	1120208017	Cornwall Lau	Plan: repeat Result: fizzle Next: repeat
Feb 8 2012 01:34:51:360PM	1120208018	Cornwall Lau	Plan: repeat Result: another fizzle Next: repeat
Feb 8 2012 01:34:58:760PM	1120208019	Cornwall Lau	Plan: repeat Result: another fizzle Next: repeat
Feb 8 2012 01:48:13:357PM	1120208020	Cornwall Lau	Plan: repeat Result: fizzle Next: repeat
Feb 8 2012 02:04:13:023PM	1120208021	Cornwall Lau	Plan: repeat Result: fizzle Next: repeat
Feb 8 2012 03:11:46:393PM	1120208022	Cornwall Lau	Plan: repeat Result: fizzle Next: repeat. it's a bit early for groundhog day... cryopump will be turned off.
Feb 8 2012 03:18:09:180PM	1120208023	Cornwall Lau	Plan: repeat Result: fizzle Next: repeat
Feb 8 2012 03:32:02:970PM	1120208024	Cornwall Lau	Plan: repeat Result: fizzle Next: repeat
Feb 8 2012 03:51:55:360PM	1120208025	Cornwall Lau	Plan: repeat Result: plasma! no LH Next: repeat with LH
Feb 8 2012 04:20:42:270PM	1120208026	Cornwall Lau	Plan: repeat with LH Result: plasma. good data with LH Next: drop current to 800kA
Feb 8 2012 04:37:59:817PM	1120208027	Cornwall Lau	Plan: drop current to 800kA Result: good plasma. good data Next: change current back to 1MA. change nl04 from 5e19 to 6.5e19.
Feb 8 2012 04:52:49:657PM	1120208028	Cornwall Lau	Plan: change current back to 1MA. change nl04 from 5e19 to 6.5e19. Result: got plasma. got good data for this MP Next: raise LH power
Feb 8 2012 05:02:51:887PM	1120208029	Cornwall Lau	Plan: raise LH power Result: got plasma. decent amount of LH tripping, but data was achieved. Next: last shot of the day.

Physics Operator Comments
Feb 8 2012 09:22:34:320AM	1120208001	Greg Wallace	Changes: Load seg 1 from shot -1 (2012 cryopump setup). Load seg 2 and 3 (active) from 1120127015. Change seg 3 Ip to 600 kA and nl_04 to 3e19. Result: Plasma through rampdown. LH faulted on all restrikes. Density on LH probes is extremely low with outer gap of 1.8cm and launcher 3.5mm behind GH limiter. Next shot: Try again. Increase time between ICRF pulses. Adjust for phase drift in LH control system. Increase RCUR by ~1mm to decrease outer gap by ~2mm. Start TF rampdown at 1.75 s for Amanda.
Feb 8 2012 09:33:53:753AM	1120208002	Greg Wallace	Changes: Try again. Increase time between ICRF pulses. Adjust for phase drift in LH control system. Increase RCUR by ~1mm to decrease outer gap by ~2mm. Start TF rampdown at 1.75 s for Amanda. Result: Disruption at 0.315 s. Something fell in? Next shot: Try again.
Feb 8 2012 09:59:41:270AM	1120208003	Greg Wallace	Changes: Try again. No DPCS changes. Result: Disruption at 0.96 s. Another injection, I think. Cell access for DNB. Next shot: Increase nl_04 programming from 0.3e20 to 0.4e20.
Feb 8 2012 10:08:14:747AM	1120208004	Greg Wallace	Changes: Increase nl_04 programming from 0.3e20 to 0.4e20. Result: Plasma through rampdown. Many LH trips but the later part of the pulse made it through. Increasing density seemed to help a bit. Next shot: Move LH launcher from 3.65 mm behind GH to 2.0 mm behind GH limiter. No DPCS changes.
Feb 8 2012 10:23:03:083AM	1120208005	Greg Wallace	Changes: Move LH launcher from 3.65 mm behind GH to 2.0 mm behind GH limiter. No DPCS changes. Result: Plasma through rampdown. LH reflection coefficient goes up from ~20% to ~50% when D-port turns on. Interestingly the LH stays on the best during D-port??? Cell access for Cornwall. Next shot: Increase nl_04 to 0.5e20 in seg 3.
Feb 8 2012 10:34:31:403AM	1120208006	Greg Wallace	Changes: Increase nl_04 to 0.5e20 in seg 3. Result: Plasma through rampdown. Clear increase in LH reflection coeff with ICRF power. Next shot: Move ICRF pulses closer together. No DPCS changes.
Feb 8 2012 10:54:25:213AM	1120208007	Greg Wallace	Changes: Move ICRF pulses closer together. No DPCS changes. Result: Plasma through rampdown. More LH trips this time. Next shot: Enable PG1 (B side lower) Ar puff, 70 ms. Increase nl_04 from 0.5e20 to 0.7e20.
Feb 8 2012 11:08:29:540AM	1120208008	Greg Wallace	Changes: Enable PG1 (B side lower) Ar puff, 70 ms. Increase nl_04 from 0.5e20 to 0.7e20. Result: Plasma through rampdown. LH faulting continuously. Looks on the reflected power like breakdown on plasma side. Next shot: Reduce RCUR from .659 to .656 (increase outer gap by 6mm).
Feb 8 2012 11:15:14:330AM	1120208009	Greg Wallace	Changes: Reduce RCUR from .659 to .656 (increase outer gap by 6mm). Result: Plasma through rampdown. Many LH trips, looks like more breakdown on plasma side. Antenna doesn't seem to like the high line averaged density/neutral pressure. Next shot: Decrease nl_04 from 0.7e20 to 0.5e20. Move LH position from 3mm behind GH to 2 mm behind GH.
Feb 8 2012 11:29:27:343AM	1120208010	Greg Wallace	Changes: Decrease nl_04 from 0.7e20 to 0.5e20. Move LH position from 3mm behind GH to 2 mm behind GH. Result: Plasma through rampdown. Much better LH pulse with lower density and closer launcher position. Next shot: Increase Ip to 800 kA.
Feb 8 2012 11:44:33:913AM	1120208011	Greg Wallace	Changes: Increase Ip to 800 kA. Result: Plasma through rampdown. Poor LH coupling on this shot, looks like high refco is the culprit. Next shot: Decrease outer gap by 6mm (increase RCUR from 0.656 to 0.659). Switch ICRF antenna order.
Feb 8 2012 11:55:39:283AM	1120208012	Greg Wallace	Changes: Decrease outer gap by 6mm (increase RCUR from 0.656 to 0.659). Switch ICRF antenna order. Result: Plasma through rampdown. Much better LH with smaller gap. Next shot: Decrease outer gap by 4mm (increase RCUR from 0.659 to 0.661).
Feb 8 2012 12:07:12:027PM	1120208013	Greg Wallace	Changes: Decrease outer gap by 4mm (increase RCUR from 0.659 to 0.661). Result: Disruption in rampdown. Clean LH pulse. Reflections highest with D-port, then E-port, then J-port, then LH only. Next shot: Decrease outer gap by another 4mm (increase RCUR from 0.661 to 0.663).
Feb 8 2012 12:22:10:733PM	1120208014	Greg Wallace	Changes: Decrease outer gap by another 4mm (increase RCUR from 0.661 to 0.663). Result: Plasma disrupts in rampdown. Breakdown on top row of LH launcher at 1.15 s causes a fault. One early fault due to high reflections? Next shot: Increase Ip to 1.0 MA.
Feb 8 2012 12:38:12:670PM	1120208015	Greg Wallace	Changes: Increase Ip to 1.0 MA. Result: Disruption at 1.47 s. Pretty good LH with very low reflections during J and with no ICRF, high reflections during E and especially D. Next shot: Decrease outer gap by another 4mm (increase RCUR from 0.663 to 0.665) Move LH launcher to ~4 mm behind GH limiter.
Feb 8 2012 12:50:04:860PM	1120208016	Greg Wallace	Changes: Decrease outer gap by another 4mm (increase RCUR from 0.663 to 0.665) Move LH launcher to ~4 mm behind GH limiter. Result: Fizzle. Breakdown is a little later than on shot 15. Bounces at ~13 ms, big spike in CIII and H-alpha. Fields and pressure look good. Next shot: Try again. Might be a post-disruption fizzle? No DPCS changes.
Feb 8 2012 01:06:39:900PM	1120208017	Greg Wallace	Changes: Try again. Might be a post-disruption fizzle? No DPCS changes. Result: Fizzle again. Datasystem seems stuck. Next shot: Increase PG4 prepuff from 30 ms to 36 ms to see if that fixes bounce.
Feb 8 2012 01:18:58:153PM	1120208018	Greg Wallace	Changes: Increase PG4 prepuff from 30 ms to 36 ms to see if that fixes bounce. Result: Another fizzle. No bounce this time but late breakdown that never really took off. Next shot: Reduce PG4 prepuff from 36 to 33 ms.
Feb 8 2012 01:47:13:890PM	1120208019	Greg Wallace	Changes: Reduce PG4 prepuff from 36 to 33 ms. Result: Another fizzle. Next shot: Decrease PG4 prepuff from 33 to 30 ms.
Feb 8 2012 01:58:41:877PM	1120208020	Greg Wallace	Changes: Reduce PG4 prepuff from 33 to 30 ms. Result: Fizzle again. Next shot: Reduce PG4 prepuff from 30 to 27 ms.
Feb 8 2012 02:07:53:310PM	1120208021	Greg Wallace	Changes: Reduce PG4 prepuff from 30 to 27 ms. Result: Closer, but still a fizzle. Breakdown is slightly late. Next shot: ECDC for 20 min before the next shot. Change IC_EF4U from -1310 to -1320 at t=0 to decrease Bz0.
Feb 8 2012 03:13:39:350PM	1120208022	Greg Wallace	Changes: ECDC for 20 min before the next shot. Change IC_EF4U from -1310 to -1320 at t=0 to decrease Bz0. Result: Fizzle again despite ECDC. Current never ramped up. Next shot: Turn off cryopump. Reduce PG4 prepuff from 27 to 13 ms to account for lack of cryopump.
Feb 8 2012 03:18:06:103PM	1120208023	Greg Wallace	Changes: Turn off cryopump. Reduce PG4 prepuff from 27 to 13 ms to account for lack of cryopump. Result: Fizzle again!??! Next shot: Reduce PG4 prepuff again, this time from 13 to 10 ms.
Feb 8 2012 03:36:57:380PM	1120208024	Greg Wallace	Changes: Reduce PG4 prepuff again, this time from 13 to 10 ms. Result: Fizzle. Next shot: Reduce early PG3 puff.
Feb 8 2012 03:54:47:657PM	1120208025	Greg Wallace	Changes: Reduce early PG3 puff. Result: Plasma through rampdown!!! No LH due to TPS CNTRLX fault (lost communication with active control system). Next shot: Repeat. No DPCS changes.
Feb 8 2012 04:19:32:250PM	1120208026	Greg Wallace	Changes: Repeat. No DPCS changes. Result: Plasma through rampdown. Good shot! LH worked on this shot. Next shot: Reduce Ip to 800 kA.
Feb 8 2012 04:39:08:263PM	1120208027	Greg Wallace	Changes: Reduce Ip to 800 kA. Result: Plasma through rampdown. LH looks better after adjusting for phase drift. Next shot: Increase nl_04 demand to 6.5e19. Increase Ip to 1.0MA.
Feb 8 2012 04:52:27:847PM	1120208028	Greg Wallace	Changes: Increase nl_04 demand to 6.5e19. Increase Ip to 1.0MA. Result: Plasma through rampdown. A few early LH faults then ran clean for the rest of the pulse. Next shot: No DPCS changes. Double LH power to 120 kW/klystron.
Feb 8 2012 05:23:06:070PM	1120208029	Greg Wallace	Changes: No DPCS changes. Double LH power to 120 kW/klystron. Result: Plasma through rampdown. Last shot of the day.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:00:12:450AM	Plasma	Ok
2	09:23:05:593AM	Plasma	Ok
3	09:38:50:347AM	Plasma	Ok
4	09:57:20:770AM	Plasma	Ok
5	10:10:09:923AM	Plasma	Ok
6	10:26:17:470AM	Plasma	Ok
7	10:39:08:557AM	Plasma	Ok
8	10:51:50:327AM	Plasma	Ok
9	11:06:35:390AM	Plasma	Ok
10	11:19:17:850AM	Plasma	Ok
11	11:32:30:723AM	Plasma	Ok
12	11:46:11:917AM	Plasma	Ok
13	11:59:04:027AM	Plasma	Ok
14	12:11:53:157PM	Plasma	Ok
15	12:25:12:560PM	Plasma	Ok
16	12:39:12:737PM	Plasma	Ok
17	12:52:05:117PM	Plasma	Ok
18	01:07:47:773PM	Plasma	Ok
19	01:31:51:970PM	Plasma	Ok
20	01:44:51:530PM	Plasma	Ok
21	01:59:56:773PM	Plasma	Ok
22	03:01:25:310PM	Plasma	Ok
23	03:14:24:257PM	Plasma	Ok
24	03:27:56:447PM	Plasma	Ok
25	03:44:59:337PM	Plasma	Ok
26	04:12:19:453PM	Plasma	Ok
27	04:30:03:883PM	Plasma	Ok
28	04:42:43:557PM	Plasma	Ok
29	04:55:46:960PM	Plasma	Ok