Alcator C-Mod Run 1120125 Information

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Miniproposals
Miniproposal:669
Date Filed:10/17/2011
Title:Rotated Antenna Commissioning and Initial Characterization
First Author:Steve Wukitch
Session Leader:Steve Wukitch (shots 1-35)

Operators
Session leader(s):Steve Wukitch
Physics operator(s):Greg Wallace
Engineering operator(s):Roza Tesfaye,Andy Pfeiffer,Bill Byford

Engineering Operator Run Comment
MP669 - field-aligned-J antenna evaluation (post-boronization); SL: S. W

Session Leader Plans
Entered: Jan 25 2012 09:44:04:943AM
Author: Steve Wukitch
Use vanilla 5.4 T, 0.8 MA discharges (start with 1120105019) to
evaluate FA-Jant boronization recovery

1. Comparison of H-mode heating and impurity characteristics.

2. scan plasma current 0.5, 0.7, 1.1 MA

3. dynamic gap scan

4. gap scan 0.5, 1, 1.5, 2 cm right gap

Would like to have gpi and LH-SOL reflectometer data for this run.

Physics Operators Plans
Entered: Jan 24 2012 05:08:14:763PM
Author: Greg Wallace
PO plan:

1120125: MP669 - field-aligned-J antenna evaluation (post-boronization)

Session leader: S. Wukitch/Y. Lin
Physics operator: G. Wallace

-----------------
No overnight boronization
----------------------------
No post boronization ECDC
----------------------------

---------------------------------------

Run begins at 9:00 am and ends at 5:00 pm

Power systems as on: 1120124007

A-coil configuration: +Dtop -Dbot -Jtop +Jbot; Hybrid enabled (standard
configuration)

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)
Leave H-bot as is D2 Hybrid DISABLED (PG5)
DO NOT fill B-div, Hybrid DISABLED (PG6)
DO NOT fill H-div, Hybrid DISABLED (PG7)
***fill NINJA with 10 psi helium, DISABLED

Enable gate-valves and shutters: ECE, VUV, HiREX Sr, Xeus, LoWEUS
Z-bolo shutter should be closed unless requested by physop

Check with the physop before opening other diagnostic gate-valves or shutters.

------
Specific diagnostics: GPI, and LH-SOL reflectometer

------------------------------------------------------------------------------
Torvac gatevalve toggle (yes/no): no
Boronization: no
Overnight ECDC: no
Impurity injection: no
ICRF: 1,2 4 transmitters
LH: no
DNB: no
Cryopump: no

Vessel temperature: 35/35/35

-----------

Run plan:

1. Load seg 1 from 1120124007 and seg 2 from 1120124007.

Then proceed with Session Leader plan to investigate FA-J antenna loading and impurity characteristics.

Session Leader Summaries
Entered: Jan 26 2012 09:18:24:217AM
Author: Steve Wukitch
We investigated plasma response to each antenna and power
compatibility limits in H-mode. The core Mo XXXII was significantly
lower for FA-J antenna compared with either D or E antennas. We were
able to couple <3.5 MW reasonably well but had significantly more
difficulty at 4 MW and above. We began a current scan to investigate
core Mo response but at 0.5 MA we did not achieve H-mode.

Physics Operator Summaries
Entered: Jan 25 2012 05:27:16:770PM
Author: Greg Wallace
Physop Summary for 1120125

Today was a continuation of the post-boronization ICRF recovery run interrupted yesterday by the alternator air switch problem. We had a few issues during the day. Two duds were caused by EF1 power supply failures. Gary fixed this by power cycling a cabinet in the control room. An earlier fizzle was not associated with any particular problem and resolved itself on the following shot with no DPCS changes. Many Fe injections and a disruption were caused during the strike point sweep from the divertor slot onto the vertical divertor plate. The injections came in as the strike point crossed the lower tile(s) of the divertor plate. Slight changes in ZXL and RXL programming (5mm change each) were able to correct this problem.

Session Leader Comments
Jan 25 2012 09:16:52:727AM1120125001Steve Wukitch001 request: BT=5.4T, Ip=0.8 MA, nl_04~0.9
D : t = [0.95, 1.25] sec, 0.40 to 1.50 MW, 80.5 MHz
E : t = [1.30, 1.60] sec, 0.30 to 1.50 MW, 80.0 MHz
J4: t = [0.60, 0.90] sec, 0.30 to 1.50 MW, 78.0 MHz
result: plasma multiple H-modes
J ran fairly well at high power
D and E are a bit ratty
next: lower BT to 5.2 T to center D/E/J cyclotron resonance

Jan 25 2012 09:32:33:433AM1120125002Steve Wukitch002 request: BT=5.2T, Ip=0.8 MA, nl_04~0.9
D : t = [0.95, 1.25] sec, 0.40 to 1.50 MW, 80.5 MHz
E : t = [1.30, 1.60] sec, 0.30 to 1.50 MW, 80.0 MHz
J4: t = [0.60, 0.90] sec, 0.30 to 1.50 MW, 78.0 MHz
result: plasma multiple H-modes

next: repeat - get clean J antenna pulse

Jan 25 2012 09:42:47:073AM1120125003Steve Wukitch003 request: BT=5.2T, Ip=0.8 MA, nl_04~0.9
D : t = [0.95, 1.25] sec, 0.40 to 1.50 MW, 80.5 MHz
E : t = [1.30, 1.60] sec, 0.30 to 1.50 MW, 80.0 MHz
J4: t = [0.60, 0.90] sec, 0.30 to 1.50 MW, 78.0 MHz
result: plasma multiple H-modes
clear arc on J but recovered
next: repeat - get clean J antenna pulse

Jan 25 2012 10:04:04:570AM1120125004Steve Wukitch004 request: BT=5.2T, Ip=0.8 MA, nl_04~0.9
D : t = [0.95, 1.25] sec, 0.40 to 1.50 MW, 80.5 MHz
E : t = [1.30, 1.60] sec, 0.30 to 1.50 MW, 80.0 MHz
J4: t = [0.60, 0.90] sec, 0.30 to 1.50 MW, 78.0 MHz
result: plasma multiple H-modes
J voltage limit is too tight
next: repeat - get clean J antenna pulse

Jan 25 2012 10:11:27:550AM1120125005Steve Wukitch005 request: BT=5.2T, Ip=0.8 MA, nl_04~0.9
D : t = [0.95, 1.25] sec, 0.40 to 1.50 MW, 80.5 MHz
E : t = [1.30, 1.60] sec, 0.30 to 1.50 MW, 80.0 MHz
J4: t = [0.60, 0.90] sec, 0.30 to 1.50 MW, 78.0 MHz
result: plasma multiple H-modes
good shot
next: D-J-E

Jan 25 2012 10:31:33:580AM1120125006Steve Wukitch006 ill timed dirt ball

next: disable Ar - see if H-mode becomes steady
Jan 25 2012 10:52:47:810AM1120125008Steve Wukitch008 request: BT=5.2T, Ip=0.8 MA, nl_04~0.9
D : t = [1.30, 1.60] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [0.60, 0.90] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.95, 1.25] sec, 0.40 to 1.30 MW, 78.0 MHz
result: plasma - early disruption during E antenna
next: repeat minus the disruption

Jan 25 2012 11:04:28:240AM1120125009Steve Wukitch009 request: BT=5.2T, Ip=0.8 MA, nl_04~0.9
D : t = [1.30, 1.60] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [0.60, 0.90] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.95, 1.25] sec, 0.40 to 1.30 MW, 78.0 MHz
result: plasma - good comparison
next: J-E-D

Jan 25 2012 11:24:10:537AM1120125010Steve Wukitch010 request: BT=5.2T, Ip=0.8 MA, nl_04~0.9
D : t = [1.30, 1.60] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [0.95, 1.25] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.60, 0.90] sec, 0.40 to 1.30 MW, 78.0 MHz
result: plasma - good comparison
next: stack antennas increase injected power to 2.4 MW and step to 4 MW

Jan 25 2012 11:38:44:653AM1120125011Steve Wukitch011 request: BT=5.2T, Ip=0.8 MA, nl_04~0.9
D : t = [0.60, 1.40] sec, 0.30 to 1.40 MW, 80.5 MHz
E : t = [0.60, 1.40] sec, 0.30 to 1.40 MW, 80.0 MHz
J4: t = [0.60, 1.40] sec, 0.40 to 1.20 MW, 78.0 MHz
result: plasma - long H-mode
D and E faulter at toward the end of the pulse
next: 3 MW and 4 MW stacked pulses

Jan 25 2012 11:54:44:790AM1120125012Steve Wukitch012 request: BT=5.2T, Ip=0.8 MA, nl_04~0.9
D : t = [0.60, 1.40] sec, 0.30 to 1.40 MW, 80.5 MHz
E : t = [0.60, 1.40] sec, 0.30 to 1.40 MW, 80.0 MHz
J4: t = [0.60, 1.40] sec, 0.40 to 1.20 MW, 78.0 MHz
result: plasma - long H-mode
D and E faulter at toward the end of the pulse
next: raise Ip=1 MA

Jan 25 2012 01:53:45:667PM1120125013Steve Wukitch013 request: BT=5.2T, Ip=1 MA, nl_04~0.9
D : t = [0.60, 1.40] sec, 0.30 to 1.40 MW, 80.5 MHz
E : t = [0.60, 1.40] sec, 0.30 to 1.40 MW, 80.0 MHz
J4: t = [0.60, 1.40] sec, 0.40 to 1.20 MW, 78.0 MHz
result: plasma - injection then ratty RF after 1 sec
next: repeat with higher initial RF

Jan 25 2012 02:36:49:707PM1120125014Steve Wukitch014 request: BT=5.2T, Ip=1 MA, nl_04~0.9
D : t = [0.60, 1.40] sec, 0.30 to 1.40 MW, 80.5 MHz
E : t = [0.60, 1.40] sec, 0.30 to 1.40 MW, 80.0 MHz
J4: t = [0.60, 1.40] sec, 0.30 to 1.40 MW, 78.0 MHz
result: plasma - looks reasonable til RF starts faulting
H/H+D is climbing
next: improve match

Jan 25 2012 02:34:40:317PM1120125015Steve Wukitch015 request: BT=5.2T, Ip=1 MA, nl_04~0.9
D : t = [0.60, 1.40] sec, 0.30 to 1.40 MW, 80.5 MHz
E : t = [0.60, 1.40] sec, 0.30 to 1.40 MW, 80.0 MHz
J4: t = [0.60, 1.40] sec, 0.30 to 1.40 MW, 78.0 MHz
result: plasma - looks good til RF starts faulting
next: improve RF match

Jan 25 2012 02:32:04:087PM1120125016Steve Wukitch016 request: BT=5.2T, Ip=1 MA, nl_04~0.9
D : t = [0.60, 1.40] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [0.60, 1.40] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.60, 1.30] sec, 0.30 to 1.10 MW, 78.0 MHz
result: early disruption - injection @0.85 s
ratty RF particularly at high power
next: repeat

Jan 25 2012 02:24:04:877PM1120125017Steve Wukitch017 request: BT=5.2T, Ip=1 MA, nl_04~0.9
D : t = [0.60, 1.40] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [0.60, 1.40] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.60, 1.40] sec, 0.30 to 1.10 MW, 78.0 MHz
result: early disruption - injection
next: repeat sans disruption
Jan 25 2012 02:16:19:700PM1120125018Steve Wukitchfizzle
Jan 25 2012 02:09:21:177PM1120125019Steve Wukitch019 request: BT=5.2T, Ip=1 MA, nl_04~0.9
D : t = [0.60, 1.40] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [0.60, 1.40] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.60, 1.40] sec, 0.30 to 1.10 MW, 78.0 MHz
result: plasma - injection at ~0.9 s
next: attempt to get rid of injection

Jan 25 2012 01:58:30:323PM1120125020Steve Wukitch020 request: BT=5.2T, Ip=1 MA, nl_04~0.9
D : t = [0.60, 1.40] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [0.60, 1.40] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.60, 1.40] sec, 0.30 to 1.10 MW, 78.0 MHz
result: plasma - no injection
next: lower Ip to 0.9 MA

Jan 25 2012 02:04:39:197PM1120125021Steve Wukitch021 request: BT=5.2T, Ip=0.9 MA, nl_04~0.9
D : t = [0.60, 1.40] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [0.60, 1.40] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.60, 1.40] sec, 0.30 to 1.10 MW, 78.0 MHz
result: plasma - still falling out of EDA
J is hitting voltage limit
next: lower Ip to 0.8 MA
Jan 25 2012 02:15:46:350PM1120125022Steve Wukitch022 request: BT=5.2T, Ip=0.8 MA, nl_04~0.9
D : t = [0.60, 1.40] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [0.60, 1.40] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.60, 1.40] sec, 0.30 to 1.10 MW, 78.0 MHz
result: plasma - steady EDA

next: raise power

Jan 25 2012 02:29:18:763PM1120125023Steve Wukitch023 request: BT=5.2T, Ip=0.8 MA, nl_04~0.9
D : t = [0.60, 1.40] sec, 0.30 to 1.40 MW, 80.5 MHz
E : t = [0.60, 1.40] sec, 0.30 to 1.40 MW, 80.0 MHz
J4: t = [0.60, 1.40] sec, 0.30 to 1.30 MW, 78.0 MHz
result: plasma - steady EDA
bit of faulting from D and J
next: raise power, move strike point to the vertical plate earlier

Jan 25 2012 02:40:51:980PM1120125024Steve Wukitch024 fizzle but it is a failure to commutate on EF1 that is the root problem

Jan 25 2012 03:00:09:053PM1120125025Steve Wukitchdud
Jan 25 2012 03:14:11:067PM1120125026Steve Wukitch026 request: Bt=5.2T, Ip=0.8 MA, nl04=0.8
D : t = [0.60, 1.40] sec, 0.30 to 1.40 MW, 80.5 MHz
E : t = [0.60, 1.40] sec, 0.30 to 1.60 MW, 80.0 MHz
J4: t = [0.60, 1.40] sec, 0.30 to 1.30 MW, 78.0 MHz
result: plasma - nice EDA at ~3.2 MW bit ratty at 4 MW

next: back to comparison J-D-E

Jan 25 2012 03:30:49:260PM1120125027Steve Wukitch027 request: Bt=5.2T, Ip=0.8 MA, nl04=0.8
D : t = [1.30, 1.60] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [0.95, 1.25] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.60, 0.90] sec, 0.40 to 1.30 MW, 78.0 MHz
result: plasma - H mode with J and D but not E

next: E-J-D

Jan 25 2012 03:48:26:527PM1120125028Steve Wukitch028 request: Bt=5.2T, Ip=0.8 MA, nl04=0.8
D : t = [1.30, 1.60] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [0.60, 0.90] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.95, 1.25] sec, 0.40 to 1.30 MW, 78.0 MHz
result: plasma - H-mode with D and E but not J

next: D-J-E


Jan 25 2012 03:49:29:790PM1120125029Steve Wukitch029 request: Bt=5.2T, Ip=0.8 MA, nl04=0.8
D : t = [0.60, 0.90] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [1.30, 1.60] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.95, 1.25] sec, 0.41 to 1.30 MW, 78.0 MHz
result: plasma
next: J-D-E
Jan 25 2012 04:04:54:943PM1120125030Steve Wukitch030 request: Bt=5.2T, Ip=0.8 MA, nl04=0.8
D : t = [0.95, 1.25] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [1.30, 1.60] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.60, 0.90] sec, 0.41 to 1.30 MW, 78.0 MHz
result: plasma
next: J-D-E with Ip=0.5 MA

Jan 25 2012 04:14:07:373PM1120125031Steve Wukitch031 request: Bt=5.2T, Ip=0.5 MA, nl04=0.8
D : t = [0.95, 1.25] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [1.30, 1.60] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.60, 0.90] sec, 0.41 to 1.30 MW, 78.0 MHz
result: plasma - RF mismatched
next: lower nl04=0.6

Jan 25 2012 04:29:43:933PM1120125032Steve Wukitch032 request: Bt=5.2T, Ip=0.5 MA, nl04=0.6
D : t = [0.95, 1.25] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [1.30, 1.60] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.60, 0.90] sec, 0.41 to 1.30 MW, 78.0 MHz
result: plasma - no H-modes
next: raise current to 1.1 MA (more ohmic heating) and density back to nl04~0.9

Jan 25 2012 04:41:28:873PM1120125033Steve Wukitch033 request: Bt=5.2T, Ip=1.1 MA, nl04=0.9
D : t = [0.95, 1.25] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [1.30, 1.60] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.60, 0.90] sec, 0.41 to 1.30 MW, 78.0 MHz
result: plasma - no H-mode with J
next: try lowering the strike point to lower H-mode threshold

Jan 25 2012 04:51:36:897PM1120125034Steve Wukitch034 request: Bt=5.2T, Ip=1.1 MA, nl04=0.9
D : t = [0.95, 1.25] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [1.30, 1.60] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.60, 0.90] sec, 0.41 to 1.30 MW, 78.0 MHz
result: plasma - H-modes
next: E-J-D

Jan 25 2012 05:04:12:613PM1120125035Steve Wukitch035 request: Bt=5.2T, Ip=1.1 MA, nl04=0.9
D : t = [1.30, 1.60] sec, 0.30 to 1.20 MW, 80.5 MHz
E : t = [0.60, 0.90] sec, 0.30 to 1.20 MW, 80.0 MHz
J4: t = [0.95, 1.25] sec, 0.41 to 1.30 MW, 78.0 MHz
result: plasma - H-modes
next: EoR

Physics Operator Comments
Jan 25 2012 09:21:56:640AM1120125001Greg WallaceChanges: Load seg 1 and 2 from 1120124007 (good shot from yesterday afternoon).

Result: Plasma through rampdown. Many (4? 5?) short H-modes. Lots of faulting from D and E, less from J.

Next shot: Lower toroidal field to 5.2 T. Ramp down TF current from -150000A to -143382A between 0.1 s and 0.15 s.
Jan 25 2012 09:33:29:873AM1120125002Greg WallaceChanges: Lower toroidal field to 5.2 T. Ramp down TF current from -150000A to -143382A between 0.1 s and 0.15 s.

Result: Plasma through rampdown. Again, many short H-modes. A little bounce on startup. Will see how it goes on the next shot. Pressure was a little higher than previous shot.

Next shot: No DPCS changes.
Jan 25 2012 09:46:58:937AM1120125003Greg WallaceChanges: No DPCS changes.

Result: Plasma through rampdown. Two short H-modes. Many faults on J, D and E are better.

Next shot: No DPCS changes.
Jan 25 2012 10:02:53:340AM1120125004Greg WallaceChanges: No DPCS changes.

Result: Plasma through rampdown. Cell access for Yijun.

Next shot: No DPCS changes.
Jan 25 2012 10:17:37:203AM1120125005Greg WallaceChanges: No DPCS changes.

Result: Several short H-modes again. RF looks better. Some H-alpha and C-III spikes around 0.01 s. Looks similar to shot 2. Will continue to wait and see if it gets worse.

Next shot: Bruce requests change of gas in NINJA plenum to 10psi D2. No DPCS changes.
Jan 25 2012 10:30:35:410AM1120125006Greg WallaceChanges: Bruce requests change of gas in NINJA plenum to 10psi D2. No DPCS changes.

Result: Disruption at 0.03 s, 150 kA. Big bright snowball on upper right of WIDE2 camera looks like it might be the cause.

Next shot: Disable Ar puff (PG1 B-side lower).
Jan 25 2012 10:44:00:357AM1120125007Greg WallaceChanges: Disable Ar puff (PG1 B-side lower).

Result: Plasma through rampdown. Three longer H-modes each terminate shortly after ICRF turns off. Nice looking ICRF power traces.

Next shot: No DPCS changes.
Jan 25 2012 10:57:37:900AM1120125008Greg WallaceChanges: No DPCS changes.

Result: Disruption at 0.77 s, shortly after E-port increases to 1.2 MW. Can't see any probems with the programming.

Next shot: No DPCS changes. Hope the disruption goes away.
Jan 25 2012 11:07:37:597AM1120125009Greg WallaceChanges: No DPCS changes. Hope the disruption goes away.

Result: Plasma through rampdown. 3 good looking RF waveforms and 3 H-modes.

Next shot: No DPCS changes. Enable DNB gate valve.
Jan 25 2012 11:23:13:883AM1120125010Greg WallaceChanges: No DPCS changes. Enable DNB gate valve.

Result: Plasma through rampdown. 3 good RF pulses. Earl noticed that strike point is on the vertical leg for 2nd and 3rd pulses but on the horizontal plate for the 1st pulse.

Next shot: No DPCS changes.
Jan 25 2012 11:36:22:817AM1120125011Greg WallaceChanges: No DPCS changes.

Result: Plasma into rampdown. Disruption as current ramps down to about 400 kA. One long H-mode. J looks good, D and E less so. All 3 antennas are stacked. 2.5 MW increases to 4 MW at 1.0 s.

Next shot: No DPCS changes.
Jan 25 2012 11:47:31:840AM1120125012Greg WallaceChanges: No DPCS changes.

Result: Plasma through rampdown. One long H-mode. J-port power looks to be missing. Injection at 1.07 s does not kill H-mode.

Next shot: Increase Ip in flattop to 1e6 A.
Jan 25 2012 12:10:30:290PM1120125013Greg WallaceChanges: Increase Ip in flattop to 1e6 A.

Result: 1 MA shot ran into rampdown. Disruption at about 400 kA during rampdown. Startup looks a little sickly. C-III and H-alpha spike around 0.013 s, current ramp slows down at same time. The startup seems to be getting worse then improving every few shots. Some injections later in shot (Fe?) cause RF faults and drop from H-mode.

Next shot: No DPCS changes.
Jan 25 2012 12:30:09:247PM1120125014Greg WallaceChanges: No DPCS changes.

Result: Plasma into rampdown. Disruption at about 400 kA in rampdown again. Catherine says neutron count is creeping up! Startup looks better again. Long cell access for Josh & Yijun. Problems with one of the 216 digitizers for J monitor. Will press on.

Next shot: No DPCS changes.
Jan 25 2012 12:47:23:880PM1120125015Greg WallaceChanges: No DPCS changes.

Result: Plasma through rampdown, disrupts at 300 kA. 3 H-modes.

Next shot: No DPCS changes.
Jan 25 2012 12:59:56:030PM1120125016Greg WallaceChanges: No DPCS changes.

Result: Plasma through rampdown.

Next shot: No DPCS changes.
Jan 25 2012 01:13:17:333PM1120125017Greg WallaceChanges: No DPCS changes.

Result: Disruption at 0.89 s. Big spike in radiated power just before disruption. Fe again. Injection seems to be coming about when strike point moves. Will see if it happens on next shot before changing strike point programming.

Next shot: No DPCS changes.
Jan 25 2012 01:25:38:243PM1120125018Greg WallaceChanges: No DPCS changes.

Result: Fizzle. C-III has big spike around 0.011 s. H-alpha looks close to normal. Current rise is very slow starting around 0.007 s. Fields and pressure look very similar to shot 17. Not sure what the issue is...

Next shot: Try again. No changes.
Jan 25 2012 01:42:08:390PM1120125019Greg WallaceChanges: Try again. No changes.

Result: Plasma through rampdown. Injection around 0.9 s but does not kill the plasma this time. Again, this is shortly after strike point moves up onto the vertical plate.

Next shot: Keep strike point in slot, do sweep up the divertor plate. Import seg 2 into seg 3. Turn off seg 2, turn on seg 3. Change ZXL programming in seg 3 so that ZXL remains constant at -.005 between 0.6 s and 1.5 s. RXL programming is already constant. Leave upper strike point programming as is.
Jan 25 2012 01:50:35:727PM1120125020Greg WallaceChanges: Keep strike point in slot, do sweep up the divertor plate. Import seg 2 into seg 3. Turn off seg 2, turn on seg 3. Change ZXL programming in seg 3 so that ZXL remains constant at -.005 between 0.6 s and 1.5 s. RXL programming is already constant. Leave upper strike point programming as is.

Result: ZXL programming change did not alter strike point sweep significantly. Fe injection moved later and is now smaller.

Next shot: Reduce Ip to 900 kA in seg 3.
Jan 25 2012 02:09:44:267PM1120125021Greg WallaceChanges: Reduce Ip to 900 kA in seg 3.

Result: Plasma through rampdown.

Next shot: Reduce Ip to 800 kA in seg 3.
Jan 25 2012 02:19:35:543PM1120125022Greg WallaceChanges: Reduce Ip to 800 kA in seg 3.

Result: Plasma through rampdown. Long steady H-mode at lower power and lower current.

Next shot: No DPCS changes, more ICRF power.
Jan 25 2012 02:32:14:330PM1120125023Greg WallaceChanges: No DPCS changes. More ICRF power.

Result: Plasma through rampdown with long H-mode at 800 kA. Several faults after power level is raised.

Next shot: Move lower x-point up and to the right to keep strike point on shelf for duration of RF pulse. Increase RXL from -0.01 to -0.005 during flattop. Move ZXL from -0.005 to 0 during flattop.
Jan 25 2012 02:50:40:740PM1120125024Greg WallaceChanges: Move lower x-point up and to the right to keep strike point on shelf for duration of RF pulse. Increase RXL from -0.01 to -0.005 during flattop. Move ZXL from -0.005 to 0 during flattop.

Result: Dud or fizzle. Fud? Dizzle? Flash of H-alpha light but looks like EF1U and EF1L both failed to commutate.

Next shot: Try again.
Jan 25 2012 03:04:18:210PM1120125025Greg WallaceChanges: Try again.

Result: Another dud, still EF1U and EF1L. Wolfe says EF1 switches never closed on this shot. Gary found that cabinet in power room needed to be power cycled.

Next shot: Try again for plasma.
Jan 25 2012 03:10:41:253PM1120125026Greg WallaceChanges: Try again for plasma.

Result: Plasma through rampdown.

Next shot: Repeat with different RF waveform.
Jan 25 2012 03:29:35:000PM1120125027Greg WallaceChanges: Repeat with different RF waveform. No DPCS changes.

Result: Plasma through rampdown. Three good RF pulses but no H-mode in middle pulse.

Next shot: No DPCS changes.
Jan 25 2012 03:36:31:530PM1120125028Greg WallaceChanges: No DPCS changes.

Result: Plasma through rampdown. Similar to shot 27. Early and late H-modes.

Next shot: No DPCS changes, switch order of RF antennas.
Jan 25 2012 03:53:33:780PM1120125029Greg WallaceChanges: No DPCS changes, switch order of RF antennas.

Result: H-modes in first and third RF pulses.

Next shot: No DPCS changes, switch order of RF antennas.
Jan 25 2012 04:05:39:037PM1120125030Greg WallaceChanges: No DPCS changes, switch order of RF antennas.

Result: Same shot, different number. H-modes in first and third RF pulses as per the norm. Plasma through rampdown.

Next shot: Reduce Ip to 500 kA in seg 3.
Jan 25 2012 04:21:53:447PM1120125031Greg WallaceChanges: Reduce Ip to 500 kA in seg 3.

Result: Plasma into rampdown. No H-mode.

Next shot: Reduce programmed nl_04 to 0.6e19 in seg 3.
Jan 25 2012 04:28:34:557PM1120125032Greg WallaceChanges: Reduce programmed nl_04 to 0.6e19 in seg 3.

Result: Plasma through rampdown. Nothing but faults from E-port. No H-mode.

Next shot: Change to 1.1MA and nl_04=0.9e20.
Jan 25 2012 04:44:20:180PM1120125032Greg WallaceChanges: Change to 1.1MA and nl_04=0.9e20.

Result: Plasma through rampdown. Three H-modes starting at 1 s.

Next shot: Pull strike point back down into the slot. Reduce RXL and ZXL by 5mm each.
Jan 25 2012 05:20:44:223PM1120125034Greg WallaceChanges: Pull strike point back down into the slot. Reduce RXL and ZXL by 5mm each.

Result: 5 H-modes. Plasma through rampdown. A hint of a bounce in startup.

Next shot: No DPCS changes.
Jan 25 2012 05:21:10:333PM1120125035Greg WallaceChanges: No DPCS changes.

Result: Plasma through rampdown. 4 H-modes. Last shot of the day.

Engineering Operator Comments
ShotTimeTypeStatusComment
109:08:20:910AMPlasmaOk
209:22:03:947AMPlasmaOk
309:34:37:390AMPlasmaOk
409:47:47:923AMPlasmaOk
510:03:00:953AMPlasmaOk
610:16:29:267AMPlasmaOk
710:31:39:220AMPlasmaOk
810:44:27:420AMPlasmaOk
910:57:06:657AMPlasmaOk
1011:10:52:243AMPlasmaOk
1111:23:51:330AMPlasmaOk
1211:36:50:067AMPlasmaOk
1311:54:47:827AMPlasmaOk
1412:08:06:920PMPlasmaOk
1512:30:32:527PMPlasmaOk
1612:47:29:480PMPlasmaOk
1701:00:20:150PMPlasmaOk
1801:13:02:797PMPlasmaOk
1901:28:42:017PMPlasmaOk
2001:41:57:110PMPlasmaOk
2101:54:47:327PMPlasmaOk
2202:07:14:947PMPlasmaOk
2302:20:40:037PMPlasmaOk
2402:33:27:970PMPlasmaOk
2502:47:42:087PMPlasmaBadNo EF1 Commutation
2603:05:04:260PMPlasmaOk
2703:17:52:163PMPlasmaOk
2803:31:06:303PMPlasmaOk
2903:44:00:463PMPlasmaOk
3003:56:36:243PMPlasmaOk
3104:09:17:270PMPlasmaOk
3204:22:32:360PMPlasmaOk
3304:35:18:790PMPlasmaOk
3404:48:16:293PMPlasmaOk
3505:00:55:490PMPlasmaOk

System Availability
Jan 25 2012 09:07:56:937AM
SystemAvailableCommentAvailability
Changed
OwnerDescriptionWho Can
Change
Active MHDnosecured - tagged outJun 02 2008 11:03AM (sears)Joe SnipesActive MHD Antennagolfit
BESyesBES system is onlineNov 22 2011 02:21PM (bespam)Bill RowanBeam Emission Spectroscopybespam,liao,rowan
BolometersyesMidplane 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 ReinkeBolometershutch,mlreinke
BoronizationnoBottle Removed. System has been tested and will be ready once bottle is installedJan 09 2012 06:32AM (dekow)Jim IrbyBoronizationdekow,irby
CECEno Jan 06 2012 03:48PM Anne WhiteCorrelation ECEwhitea
CNPAyesMultiple channel CNPA available, no safety risk for in-vessel accessApr 14 2011 12:01PM (parker)Ron ParkerCompact Neutral Analyzerparker
Cryopump - Upper DivertoryesOperational. He level meter not working on 500L dewar. Frank will take manual readings.Jan 11 2012 11:46AM (labombard)Brian LaBombardUpper Divertor Cryopumpdekow,irby,labombard
CXRSyescore-CXRS system is onlineNov 22 2011 02:21PM (bespam)Bill RowanCharge Exchange Spectroscopybespam,blip,liao,rachmcd,rowan
CXRS edgeyesMichael CHurchill has primary responsibility at the momentApr 19 2011 11:44AM (blip)Bruce LipshultzMeasurement of CXR light in the pedestal region at both the high- and low-field sidesblip,rmchurch
D Alphayes\ha2_bright is available; \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 is not availableJul 01 2009 09:45AM (terry)Jim TerryBalmer Alpha Monitorirby,terry,wolfe
Dalsanosystem is is installed and aligned, but not functional (appears to be a broken cable)Dec 05 2011 02:41PM (marmar)Earl MarmarVisible Bremsstrahlung Imagingmarmar
Disruption Mitigationnogas jet valve disabled on 2011/04/13Apr 13 2011 02:04PM (granetz)Robert GranetzGas Jetgranetz,whyte
Divertor IRno Mar 06 2007 10:50AM Glen WurdenDivertor IR Digital Videogwurden,terry
Divertor IR Spectroscopyno Mar 06 2007 10:51AM Glen WurdenDivertor IR Spectroscopygwurden,terry
DMBolo AXUV diodesnoDiodes are taking data, but system is not fully operational yet. Post-acquisition data processing code is not yet functional.Dec 02 2011 03:27PM (golynyk)Geoff OlynykSet of six AXUV diodes in a toroidal array of midplane wall boxes.golynyk,granetz,mlreinke,whyte
DNByes Dec 01 2011 11:46AM (granetz)Robert GranetzDiagnostic Neutral Beamdterry,granetz,mochung
ECDCyesOperational as of 11/19/11Nov 22 2011 03:01PM (irby)Jim Irby2.45 GHz, 3 kW, discharge cleaning systemdekow,irby,pfeiffer
FRC-ECEnoPower off to RF and IF sections- Power on to DAApr 11 2011 02:54PM (phillips)Perry PhillipsHeterodyne ECE-32 channelsbespam,liao,phillips,rowan,whitea
FTCIno Jan 06 2012 04:36PM Jim IrbyFast two-color interferometerirby
G-Side Ratiomaticyes Dec 02 2011 12:24PM (toland)Brian LaBombardG-side ratiomatic ionization gaugelabombard,toland
Glow DischargenoPower supply unplugged and redtagged, HV cables removedApr 14 2011 08:03AM (dekow)Jim Irby1 kV, 5 A, glow discharge systemdekow,dterry,irby
GPCyesUsing new preamps.Nov 30 2011 07:51AM (hubbard)Amanda HubbardECE Polychromaterhubbard
GPC2yesDewar cold. Nov 21 2011 09:55AM (hubbard)Amanda HubbardECE Polychromaterhubbard
GPIyesThe 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 TerryGas Puff Imagingterry,zweben
H/Dyessystem is functional and taking dataDec 05 2011 02:42PM (marmar)Earl MarmarH/D Ratiomarmar
HEATyes Jan 09 2012 06:32AM (dekow)Gary Dekow - Machine Heaters -burke,dekow
Hirex JryesHirex-Jr has been installedJun 28 2010 03:36PM (rice)John RiceHigh Resolution X-Rayince,rice
Hirex SryesInstalled and aligned. Will be available for Ti/Vr profiles after focusing tests and locked modes are taken.Dec 06 2011 08:21AM (ypodpaly)John RiceHigh Resolution X-Raycgao,ldelgado,rice,ypodpaly
HXRyes32 Channels operational,, no safety risk for in-vessel accessApr 14 2011 12:05PM (parker)Ron ParkerHard X-Ray Arrayfaust,parker,schmidt
ICRF D-AntennanosecuredApr 14 2011 08:55AM (wukitch)Steve WukitchD-port antennawukitch,ylin
ICRF E-AntennanosecuredApr 14 2011 08:55AM (wukitch)Steve WukitchE-port antennawukitch,ylin
ICRF J-AntennanosecuredApr 14 2011 08:56AM (wukitch)Steve WukitchJ-port antennawukitch,ylin
Impurity SpectroscopyyesBeing upgraded with better optics and new spectrographs. Dan Miller has primary responsibility.Apr 19 2011 11:46AM (blip)Bruce LipshultzMeasurement of recycling light and impurity source rates at multiple surfaces around the tokamakblip,miller
Laser Blow-OffyesOperational and testedJan 06 2012 03:50PM (g)Martin GreenwaldImpurity Injection Systemg,nthoward
Lower HybridnoLH HV Breaker Opened and Tagged, TPS Upgrade UnderwayNov 10 2011 03:51PM (dterry)Ron ParkerLower Hybriddterry,parker,wallaceg
Lower Hybrid ReflectometernooffApr 15 2011 08:24AM (dominguez)Arturo DominguezLower Hybrid Reflectometerdominguez,marmar,parker,sgbaek
LoWEUSyesLoWEUS 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 Spectrometermarkchil,mlreinke
LPInoBeam line removedMay 30 2008 02:09PM (bose)Earl MarmarLithium Pellet Injectorbose,marmar
Ly-alphayesMidplane Lyman-a and LEDGE-LY working normally. New B-PORT Lyman (BPLY) still being debugged.Jan 23 2012 12:04PM (mlreinke)Matt ReinkeLyman alpha camerasfaustian,labombard,mlreinke
Magneticsyes Dec 01 2011 11:51AM (g)Robert GranetzBp coils and flux loops for equilibrium controlgranetz,wolfe
McPhersonyesMcPherson viewing the 10-14 nm region for molybdenum monitoring. It's days are numbered as LoWEUS has demonstrated superiority.Jan 23 2012 12:05PM (mlreinke)Jim TerryVUV Spectrometermarkchil,mlreinke,terry
MichelsonyesFront end at 4.5e-8 T. Reduced speed for initial operation.Nov 30 2011 07:51AM (hubbard)Amanda HubbardECE Te Profileshubbard,schmidt
MKSyes Dec 02 2011 12:27PM (toland)Brian LaBombardBaratron pressure gaugeslabombard,toland
MLPnoSystem 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 LaBombardMirror Langmuir Probe Electronics Systemlabombard
MSEno1/3/2011: push-pull mechanism broken. MSE inoperativeJan 03 2012 11:47AM (sscott)Steve ScottMotional Stark Effectjinseok,sscott
NeutronsyesHigh voltage is on. We're ready for plasma.Nov 21 2011 12:58PM (fiore)Catherine FioreNeutron Detectorsfiore
Neuts and HardsyesAll detectors Powered On --- Waiting for neutrons for calibrationNov 22 2011 01:05PM (irby)Jim IrbyX-Ray/Neutron Detectors at K-Horirby
NINJAyesC-bottom and new F-bottom system ready.Dec 02 2011 12:28PM (toland)Brian LaBombardNINJA gas pufflabombard,terry,toland
PCIyesOperational.Nov 30 2011 12:45PM (ntsujii)Miklos PorkolabPhase Contrast Imagingemd,ennever,ntsujii,porkolab
Penning GaugesyesOperational. High voltage comes on during INIT and off at RECOOL.Dec 09 2011 09:48AM (labombard)Brian LaBombardPenning Ionization Gaugeslabombard
Plasma TVyesWIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational.Jul 01 2009 09:46AM (terry)Jim TerryVideo of plasma via several camerasdekow,irby,terry,wolfe
Polarimeteryes3 chords operational but with high noise levelJan 06 2012 04:22PM (irby)Jim IrbyC-Mod Polarimeterirby
Power - Alternator Air Switchyes Jan 09 2012 06:33AM (dekow)Gary Dekowfeeds all the other suppliescochran,dekow,dterry,irby
Power - PEIyes Jan 09 2012 06:33AM (dekow)Gary DekowPEI Systemcochran,dekow,dterry,irby
Power - TMXyes Jan 09 2012 06:33AM (dekow)Gary DekowEf2s,. EFCs and A-Coilsbyford,cochran,dekow,dterry,irby
Power Systemsyes Jan 09 2012 06:33AM (dekow)Jim IrbyC-Mod Magnet Suppliesbyford,cochran,dekow,dterry,irby
Probe Array - ISDyesOperational, except for probe #1 (open circuit) and probe #16 (not installed).Dec 09 2011 09:50AM (labombard)Brian LabombardInner Lower Divertor Probe Arraylabombard
Probe Array - LHyesOperational, except for bottom-D probe (open circuit).Dec 09 2011 09:52AM (labombard)Brian LaBombardLower Hybrid Probe Arraylabombard
Probe Array - OSDyesF-divertor ok. J-divertor ok, except for JDIV_06 which is shorted out.Dec 09 2011 09:54AM (labombard)Brian LaBombardOuter Lower Divertor Probe Array (F and J)labombard
Probe Array - UDIVyesOperational except for probes #4, 5 and 13 (open)Dec 09 2011 09:56AM (labombard)Brian LaBombardUpper Divertor Probe Arraylabombard
ReflectometeryesAs of 1120105xxx, all channels are connectedJan 05 2012 09:14AM (dominguez)Earl MarmarReflectometerdominguez,marmar
Scanning Probe - ASPyesIon Sensitive Probe head installed. Testing in piggy-back mode.Dec 20 2011 12:33PM (labombard)Brian LaBombardA-Port Scanning Probelabombard
Scanning Probe - FSPyesOperational.Dec 09 2011 09:57AM (labombard)Brian LaBombardF-Port Scanning Probelabombard
Scanning Probe - WASPyesA-port WASP is operational. K-port WASP is dead (all probes melted together).Dec 09 2011 09:58AM (labombard)Brian LaBombardInner Wall Scanning Probelabombard,nsmick
Shoelace AntennayesFixed frequency operation available (100kHz) at moderate power (< 0.5kW). Otherwise in receiver mode.Jan 11 2012 11:50AM (labombard)Brian LaBombardHigh-k active MHD antenna, for QCM, WCM studiesgolfit,labombard
SOL reflectometeryesc-port waveguides operational, h-port waveguides are not.Nov 29 2011 12:04PM (cornwall)Cornwall LauSOL reflectometercornwall,wukitch,ylin
SparkeryesNew Type II sparker replaced Type I on 11/17/2011Nov 23 2011 08:53AM (irby)Jim IrbyField Emission Preionization for C-Moddekow,irby,parkin
Surface Science StationnoSSS is up to air, no safety issuesApr 14 2011 12:06PM (ochoukov)Bruce LipschultzRadially scanning probe located on K-portblip,ochoukov
TCIyesTCI Operational. Density feedback operational.Nov 10 2011 11:47AM (irby)Jim IrbyTwo-Color Interferometerirby,murray
TS - CorenoLasers and core Thomson are operatingJan 19 2012 10:22AM (yma)Jerry HughesCore Thomson scatteringjrwalk,jwhughes,yma
TS - EdgenoAll lasers are shut down and cannot be fired into cell.Apr 11 2011 01:20PM (jwhughes)Jerry HughesMillimeter resolution edge Thomson scatteringjrwalk,jwhughes,yma
Vispecno350 and 670 nm, 4 spatial channelsNov 28 2007 09:58AM (agraf)Alex GrafVisible Spectrometeragraf
XEUSyesXEUS viewing the 1-6 nm region, spectral brightness vs. lambda and time are being stored in tree.Jan 23 2012 12:13PM (mlreinke)Matt ReinkeX-ray Extended Ultraviolet Spectrometermarkchil,mlreinke
XTOMOyesARRAY1->4 working normally, ARRAY5 (new core view) working but spatial calibration issues not yet resolvedJan 23 2012 12:13PM (mlreinke)Robert GranetzX-Ray Tomographyfaustian,granetz,mlreinke