Alcator C-Mod Run 1080130 Information

Miniproposals

Miniproposal: 448a

Date Filed: 1/24/2008

Title: Comparison of Small ELM regimes on C-Mod, MAST and NSTX (Rev A)

First Author: Rajesh Maingi

Session Leader: Rajesh Maingi (shots 1-16)

Miniproposal: 520

Date Filed: 1/9/2008

Title: Sawtooth Evoluiton Studies

First Author: Alex Ince-Cushman

Session Leader: Alex Ince-Cushman (shots 17-27)

Operators
Session leader(s):	Rajesh Maingi,Alex Ince-Cushman
Physics operator(s):	Robert Granetz
Engineering operator(s):	Sam Pierson,Bill Cochran,Ed Fitzgerald

Engineering Operator Run Comment
am: MP448 Comparison of Small ELM regimes on C-Mod, MAST and NSTX pm: MP

Session Leader Plans

Entered: Jan 30 2008 11:33:35:420AM

Author: Alex Ince-Cushman

MP 520: Sawtooth Evolution Studies

Session Leader: Alex Ince-Cushman (afternoon)
PhysOp: Bob Granetz

The goal of this experiment is to measure the evolution of the toroidal rotation and ion temperature profiles within a single sawtooth oscillation.

Diagnostics: Hirex, Thomson, Edge Thomson, GPC, Bolometer arrays, McPherson, Chromex, FRC

Step 1: (1-2 shots) Locked mode shots for velocity calibration. Based on Shot 1080116016. Ip = 0.8, nl04=0.4e20. Argon puff 200ms @ 0.3s

TURN CRYOPUMP ON

Step 2: (6-8): Establish USN, 1 MA, pumped L-mode with 2 MW ICRF at nl04 = 1.0e20. Then Ramp up RF and puff.

Load 1080116021. Argon pressure @ 1.5 psi, 1.0s puff @ 0.3s, 2MW RF

Step 3: (3-4): Adjust RF Phasing to optimize sawtooth period.

Step 4: If time permits attempt discharges at Ip = 0.8 MA and 1.2 MA

Physics Operators Plans

Entered: Jan 29 2008 09:31:21:167PM

Author: Robert Granetz

Engineering setup for Wednesday 30 Jan 2008 am: MP448 Comparison of Small ELM regimes on C-Mod, MAST and NSTX pm: MP520 Rotation and Ti during sawteeth Session leader: Maingi (am); Ince-Cushman (pm) Physics operator: Granetz ECDC overnight in D2 and bake at 60 C. Run will start at 09:00 and end at 17:00. Power systems as on 10801029024. *** NOTE: WE WILL WANT TO DO BETWEEN-SHOT BORONIZATION DURING THIS RUN, PROBABLY LATER IN THE MORNING. *** A-coil configuration: +Dtop -Dbot -Jtop +Jbot; 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 NINJA as is DISABLED Enable the following gate valves and shutters, assuming no vacuum problems: ECE, VUV, Z-bolo Torvac setup: keep gate valves open Specific diagnostics: ------------------------------------------------------------------------------- ICRF Setup: yes, all transmitters in run-on by 08:30 LH Setup: no DNB: no Cryopump: yes, starting with the first shot. -------------------------------------- Between shot boronization Parameters -------------------------------------- foreline(TC6) pressure request: 70 mTorr sweep (rmin/rdwell/rmax): 60/75/80 cm scan: 20/120 s dP: 50 psi EF4: 200 A ------------------------------------------------------------------------------- Run plan: am: Continue from where we left off yesterday (Tuesday). Start by loading shot 1080129024, but decrease nl_04 to 0.6e20 m-2. pm: The afternoon run will involve using ICRF to get long sawteeth, coupled with HIREX spectra using lots of argon.

Session Leader Summaries

Entered: Jan 30 2008 06:56:54:653PM

Author: Alex Ince-Cushman

MP 520: Sawtooth Evolution Studies

The locked mode portion of the experiment was successful. Two steady locked mode discharges were obtained (Shots 17 & 18) with sufficient argon levels to provide a good wavelength calibration for Hirex-Sr.

The intra-sawtooth profile measurement portion of the run was partially successful. Due to a problem with J port, we are unable to use RF phasing techniques to generate monster sawtooth oscillations. We did, however, take useful data at the maximum Hirex-sr frame rate (200Hz) on 3 discharges (24, 25 & 26) with moderate sawtooth oscillation periods (~20ms).

The tooth-to-tooth repeatability was quite good during the flattop portions of these discharges and so it should be possible to add sawtooth oscillations together to improve the quality of the data.

Entered: Jan 31 2008 08:19:33:470AM

Author:

MP448a: Comparison of small ELM regimes on C-Mod, MAST and NSTX
(Shots 1--16)

Session summary: we started from discharge #1080125011 and changed the RXP by
+1.2cm and -0.7 cm. Neither of these changes produced small ELMs, only the
original RXP! We also tried Ip=0.7 MA, and did not see small ELMs. We did a target
density scan from 0.6 to 0.8 and found the best small ELM signatures at 0.8,
see#1080130007. We did a power scan showing that the minimum rf power for these
ELMs was ~ 3.1 MW, and we also got a shot with 4.7 MW, still seeing the small
ELMs.

List of useful shots:
1 �?? repeat of 24 from yesterday with lower nel. Actually got same or higher density because of delayed L-H. Small ELMs visible on SXR channel #s 6-7 (drop indicating outflux) and #12-13 (increase, indicating filament). These precede the fast D-alpha.
2 �?? restore 1080129026 with higher nel to 7. Good shot, no small ELMs.
3 �?? start from #1 above, and move Rx out to 56.5 cm from 55.3cm. Got 56.7 cm, and lower kappa, but no small ELMs.
4 �?? Start from #1 and move RXP in by 1 cm. Actually moved in by 7mm. No small ELMs.
6 �?? try nel to 8. Got it �?? small ELMs later in shot, as density pumps out.
7 �?? repeat. Great shot �?? best small ELMs. Show up the best on global_param2 Dalpha and also on D/Eport RF power.
9 �?? turn off Jport and go back to density of 8 as in #7. Tried for 2.4 MW �?? got it. No small ELMs.
10 �?? repeat with max. power of 4.5 MW �?? got it, and the small ELMs! Nice shot.
13 �?? repeat �?? good shot, 3.1 MW rf power, small ELMs from 0.7-0.75 sec, very modest, but they are ok. This is lower range of input power for these ELMs.
14 �?? drop Ip to 0.7 MA �?? no ELMs, below threshold.

Physics Operator Summaries

Entered: Jan 30 2008 05:14:52:190PM

Author: Robert Granetz

Run summary for Wednesday 30 Jan 2008

am: MP448 Comparison of Small ELM regimes on C-Mod, MAST, & NSTX (continuation)
pm: MP520 Rotation and Ti during sawteeth

Session leader: R. Maingi (am); A. Ince-Cushman (pm)
Physics operator: R. Granetz

The first half of the day was a continuation of yesterday's run, and it was
pretty successful from a physics standpoint. There were two problems with
machine operation that were troublesome though. One was apparent
contamination of the EF2 feedback control signal, suspected to be due to RF
pickup from the J-antenna system. The other problem was a high
thermocouple reading on one of the TF legs (D-right; outboard vertical)
which caused 15+ minute delays between shots. This problem developed
around midday. My understanding is that the resistance measurement did not
corroborate the cooling problem, so this may just be a faulty thermocouple.

After shot 21 we had a power room access to look into the EF2/RF pickup
problem. The control board for EF2 (and EFC and the A-coils) is in a rack
that's only a couple of meters from RF tubes, and the cabinet doors had
been removed. So we put an RF choke on the control wires, and replaced the
two front doors. After that, we ran J-port up to 1.5 MW and didn't see any
problems with EF2.

Scorecard: 21 plasmas
1 dud (the cryopump burped)
5 fizzles
0 power supply tests
0 no-power MDS shot cycles
--------------
Total: 27 shot cycles

Session Leader Comments

Jan 30 2008 09:12:35:307AM 1080130001 repeat of 1080129024 with lower nel - got nice small ELMs from 0.7-0.8 sec, as
yesterday. H-mode transition delayed a little, and target density was
actually higher than yesterday. Nice shot.

Jan 30 2008 11:28:08:103AM 1080130002 repeat of 1080129026 with higher nel to 7. Good shot, but no small ELMs.

Jan 30 2008 11:29:03:167AM 1080130003 repeat of #1 above and increase Rx from 55.3cm ro 56.5 cm. Actually got 56.7cm
but no small ELMs.

Jan 30 2008 12:00:03:170PM 1080130004 repeat of #1 above and decrease Rx from 55.3cm ro 54.3 cm. Actually got 54.7cm
but no small ELMs. The small ELM window is really narrow.

Jan 30 2008 12:01:11:860PM 1080130005 repeat of #1 above with target nel of 9. rf did not couple - neutral density
too high?

Jan 30 2008 12:01:56:800PM 1080130006 repeat of #1 with target nel=8. Got it - small ELMs show up later in shot.

Jan 30 2008 12:02:23:750PM 1080130007 repeat of last shot - best small ELM signatures of all the shots so far.
rf=3.5 MW.

Jan 30 2008 12:02:46:207PM 1080130008 Try for nel=9 - disrupted early.

Jan 30 2008 12:03:55:580PM 1080130009 Go back to target nel=8, with rf=2.4 MW with no J-Port. Good. Nice steady
EDA with no sign of small ELMs - this is below the power/beta threshold.

Jan 30 2008 12:04:37:350PM 1080130010 Repeat with max rf=4.5 MW. Good - small ELMs still present, this is high
power shot.

Jan 30 2008 12:04:51:113PM 1080130011 Repeat with rf=3.2 MW - fizzle.

Jan 30 2008 12:05:02:223PM 1080130012 Try again - fizzle.

Jan 30 2008 12:41:15:187PM 1080130013 Try again - good shot. 3.1 MW of rf power, very weak signatures of small
ELMs. This appears to be right at the lower power threshold for small
ELMs.

Jan 30 2008 12:41:38:297PM 1080130014 Go back to 3.6 MW and drop Ip to 0.7 MA - good shot, no small ELMs.

Jan 30 2008 12:44:03:347PM 1080130015 Go back to 3.6 MW and drop Ip to 0.7 MA - good shot, no small ELMs. 0.7 MA
is below the Ip threshold.

Jan 30 2008 12:56:32:690PM 1080130016 Go back to 3.6 MW and use Ip of 0.75 MA. Dud - cryo burp.

Jan 30 2008 12:56:58:080PM 1080130017 Try again for 0.75 MA.

Jan 30 2008 02:42:02:343PM 1080130017 Alex Ince-Cushman Good locked mode discharge (0.6s-1.4s). The off axis rotation channels seem to be locking in two stages (first step at 0.6 and then another at 1.0). For the next shot we will increase the argon puff from 200ms to 300ms. Puff at 1.4s seemed to "un-lock" the shot.

Jan 30 2008 02:41:23:403PM 1080130018 Alex Ince-Cushman Good locked mode discharge (0.5s-1.5s). A two-staged locking process (similar to the previous shot) was observed.

Jan 30 2008 03:03:42:947PM 1080130021 Alex Ince-Cushman Shot disrupted at 0.75s. Argon signal levels are good. Sawteeth with periods up to 20ms were observed.

Jan 30 2008 06:12:24:367PM 1080130024 Alex Ince-Cushman There was not enough argon in the plasma to prevent H-mode transitions. There was a very large swing in rotation (~80km/s) caused by the ~4MW of RF.

Physics Operator Comments

Jan 30 2008 08:45:44:057AM Robert Granetz Loaded shot 1080129024, which had segments 1 and 3 active. Decreased nl_04 in segment 3
from 0.7 to 0.6e20 m-2. Set pre-fill pulse length to 60 ms because the cryopump in on.

Jan 30 2008 09:14:46:933AM 1080130001 Robert Granetz Shot 01 -- Plasma. Good shot. Prf=3.6 MW total from D, E, & J. Cryopump on.
Good startup. Got small ELMs.

Next shot: load 1080129026, then reload seg 1 with seg 1 from this shot (1080130001).
Seg1 and 2 will be active. Increase nl_04 to 0.7e20 m-2.

Jan 30 2008 09:41:12:917AM 1080130002 Robert Granetz Shot 02 -- Plasma. Good shot. Very slightly different shape at top of plasma results
in no ELMs. Three H-modes. Prf=3.6 MW. Good startup. A bit of vertical
instability from t=0.7 to 0.8 s.

Next shot: Load seg 3 from shot 01 seg 3; turn off seg 2 and turn on seg 3. Increase
RXL by 12 mm.

Jan 30 2008 09:50:02:710AM 1080130003 Robert Granetz Shot 03 -- Plasma. Good shot. Prf=3.5 MW. Three H-modes. No ELMs.
Good startup.

Next shot: Reload seg 3 from shot 01 seg 3; move RXL in by 1.0 cm.

Jan 30 2008 10:15:34:707AM 1080130004 Robert Granetz Shot 04 -- Plasma. Good shot. One long EDA H-mode. Prf=3.6 MW. Good startup.

Next shot: reload seg 3 from shot 01 seg 3; increase nl_04 to 0.9e20 m-2.

Jan 30 2008 10:23:16:590AM 1080130005 Robert Granetz Shot 05 -- Plasma. Good shot. D and J didn't go; Prf=0.8 MW. RF doesn't like
the higher edge pressure. Good startup.

Next shot: repeat, but reduce nl_04 to 0.8e20 m-2.

Jan 30 2008 10:44:27:223AM 1080130006 Robert Granetz Shot 06 -- Plasma. Disrupted at t=1.17 s. According to Steve Wolfe, it's a problem
with RF leakage getting into the EF2 control.

Next shot: repeat, except turn off J-port power at t=1.05 s.

Jan 30 2008 10:54:48:423AM 1080130007 Robert Granetz Shot 07 -- Plasma. Good shot. Prf=3.5 MW (until J turns off at t=1.05 s, as directed).
Session leader says, ""best ELMs to date"". Target nl=0.8e20 m-2, as requested.

Next shot: increase nl_04 to 0.9e20 m-2. Also increase pre-fill pulse by 3 ms.

Jan 30 2008 11:05:31:733AM 1080130008 Robert Granetz Shot 08 -- Plasma. Disrupted at t=0.71 s, again due to RF pickup in EF2U.
Startup was better.

Next shot: decrease nl_04 to 0.8e20 m-2. Only run D and E, but at 2.5 MW.

Jan 30 2008 11:20:07:627AM 1080130009 Robert Granetz Shot 09 -- Plasma. Good shot. Long EDA H-mode. Prf=2.4 MW from D & E. We kept
J-port off in order to avoid problems with EF2 pickup. Target nl_04 = 0.8e20 m-2,
as requested.

Next shot: repeat, except turn on J-port to get 4+ MW total, hopefully without causing
a problem for EF2.

Jan 30 2008 11:40:56:010AM 1080130010 Robert Granetz Shot 10 -- Plasma. Disrupted at t=1.23 s, again due to EF2/RF problem. Prf=4.5 MW.
Wth peaks at 175 kJ.

Next shot: repeat, except decrease J-port so that total Prf=3.2 MW, and also turn off
J-port at t=1.0 s.

Jan 30 2008 11:45:45:390AM 1080130011 Robert Granetz Shot 11 -- Fizzle. Post-disruption recovery?

Next shot: reduce pre-fill 1 ms (completely superfluous, of course)

Jan 30 2008 11:59:55:013AM 1080130012 Robert Granetz Shot 12 -- Fizzle again.

Next shot: reduce pre-fill another 2 ms.

Jan 30 2008 12:14:47:360PM 1080130013 Robert Granetz Shot 13 -- Plasma. Good shot. Prf=3.1 MW. Good startup.

Next shot: Drop Ip to 0.7 MW; raise Prf to 3.6 MW, and turn off J at t=1.0 s.
Keep the density at nl_04=0.8e20 m-2.

Jan 30 2008 12:35:33:260PM 1080130014 Robert Granetz Shot 14 -- Plasma. Good shot. Ip=0.7 MA. Prf=3.6 MW, with J purposely turning off at t=1.0 s.
Good startup. One EDA H-mode.

Next shot: increase Ip to 0.75 MA.

Jan 30 2008 12:48:56:807PM 1080130015 Robert Granetz Shot 15 -- Dud. Cryopump burped, giving a pre-fill pressure of 0.130 mTorr.

Next shot: try again.

Jan 30 2008 01:09:48:283PM 1080130016 Robert Granetz Shot 16 -- Plasma. Disrupted at t=0.77 s, again due to EF2U/RF problem.

End of this MP. Next shot will begin MP 520.

Next shot: Load shot 1080116016 (locked mode velocity calibration). Reload seg 1 from shot 16 seg 1.
Turn off cryopump, and therefore reduce pre-fill to 22 ms.

Jan 30 2008 01:26:51:223PM 1080130017 Robert Granetz Shot 17 -- Plasma. Good shot. 0.8 MA, 5.4 T, LSN. Ohmic. Got the locked mode (for
rotation calibration) at t=0.63 s (A-coil feedback was disabled). Good startup.

Next shot: same, except increase argon pulse length to 0.3 s. No cryopump; no ICRF

Jan 30 2008 01:49:15:580PM 1080130018 Robert Granetz Shot 18 -- Plasma. Good shot. Locked mode starts at t=0.63 s again. Good startup.

Next shot: load 1080116021 (USN, 1 MA, nl_04=1.0e20 m-2). Reload startup from 1080130018 seg 1.
Turn on cryopump, so also set pre-fill pulse length to 64 ms. Turn on 3 MW of ICRF.

Jan 30 2008 02:26:17:247PM 1080130019 Robert Granetz Shot 19 -- Plasma. Disrupted at t=0.60 s. EF2/RF problem again.

Next shot: decrease nl_04 to 1.0e20 m-2. Have J-port phasing change during
the shot. Also reduce pre-fill by 4 ms for disruption recovery.

Jan 30 2008 02:36:19:023PM 1080130020 Robert Granetz Shot 20 -- Fizzle. Slow Ip ramp...disruption recovery?

Next shot: reduce pre-fill another 4 ms.

Jan 30 2008 03:07:50:607PM 1080130021 Robert Granetz Shot 21 -- Plasma. Disrupted at t=0.76 s, again due to EF2/RF problem.

Power room access to shield EF2 control wires and put cabinet doors back
on the EF2/EF4/A-coil control cabinet.

Next shot: reduce argon plenum pressure to 1.3 psi.

Jan 30 2008 03:13:30:753PM 1080130022 Robert Granetz Shot 22 -- Fizzle. Disruption recovery blues.

Next shot: reduce pre-fill another 4 ms.

Jan 30 2008 03:36:05:553PM 1080130023 Robert Granetz Shot 23 -- Fizzle.

Next shot: reduce pre-fill another 5 ms.

Jan 30 2008 04:03:29:500PM 1080130024 Robert Granetz Shot 24 -- Plasma. Good shot. Prf=4 MW, but dropping out a lot, resulting in lots of short
H-modes. GPC gate valve was not enabled, so no ECE Te.

Next shot: Tweak early density; decrease pre-fill another 1 ms. Increase argon plenum pressure
to 2.0 psi. Decrease nl_04 to 0.9e20 m-2.

Jan 30 2008 04:27:23:450PM 1080130025 Robert Granetz Shot 25 -- Plasma. Good shot. Disrupted at t=1.54 s (in rampdown). Got the GPC Te this time,
with good sawteeth. Prf=3.5 MW. No problems with EF2/RF pickup.

Next shot: reduce pre-fill 3 ms for disruption recovery.

Jan 30 2008 04:51:19:053PM 1080130026 Robert Granetz Shot 26 -- Plasma. Good shot. Prf=3.5 MW. Large amplitude sawteeth on ECE. Inverted
sawteeth on central x-rays (due to the argon). Good startup.

Next shot: Increase argon plenum pressure to 2.5 psi.

Jan 30 2008 05:17:02:537PM 1080130027 Robert Granetz Shot 27 -- Plasma. Disrupted at t=0.67 s. The sawteeth stopped around t=0.53 s.
There's a bright reflection(?) on the inboard wall after the disruption
on the WIDE2 video.

End of run.

Engineering Operator Comments

Shot Time Type Status Comment

1 09:02:59:623AM Plasma Ok No Faults

2 09:26:16:527AM Plasma Ok

3 09:42:13:323AM Plasma Ok

4 10:01:09:190AM Plasma Ok

5 10:16:13:190AM Plasma Ok

6 10:29:07:160AM Plasma Ok

7 10:45:23:320AM Plasma Ok

8 10:59:18:180AM Plasma Ok

9 11:12:04:570AM Plasma Ok

10 11:27:53:680AM Plasma Ok

11 11:42:28:760AM Plasma Ok

12 11:55:05:353AM Plasma Ok

13 12:07:59:243PM Plasma Ok

14 12:25:18:530PM Plasma Ok

15 12:43:42:550PM Plasma Ok

16 12:57:59:723PM Plasma Ok

17 01:17:15:463PM Plasma Ok

18 01:40:34:897PM Plasma Ok

19 02:05:54:800PM Plasma Ok

20 02:27:12:607PM Plasma Ok

21 02:47:19:850PM Plasma Ok

22 03:10:34:470PM Plasma Ok

23 03:30:47:610PM Plasma Ok

24 03:48:03:267PM Plasma Ok

25 04:12:26:197PM Plasma Ok

26 04:40:36:637PM Plasma Ok

27 05:08:49:857PM Plasma Ok

System Availability

Jan 30 2008 09:02:43:200AM

System Available Comment Availability
Changed Owner Description Who Can
Change
Active MHD yes Fully operational Mar 28 2007 09:19PM (sears) Joe Snipes Active MHD Antenna sears,snipes
BES yes vertical array of six views at R ~ 87.3 cm, radial array of three views out to R ~ 89 cm, both at outboard midplane. Three discrete fiber views of beam at R ~ 70.0, 76.5 and 82.5 cm. Feb 06 2007 10:00AM (bravenec) Ron Bravenec Beam Emission Spectroscopy bravenec,rowan
Bolometers yes Diode 2pi working fine, foil 2pi being low-pass filtered to remove noise. Outboard miidplane AXUV fine. Midplane foils working fine, but need to fill tree with calibrations. 2D AXUV arrays are being digitized but need further debugging and calibration. Dec 19 2007 07:16PM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization no First Boronization 5/9/07 Bottle has been removed from the cell Sep 14 2007 12:42PM (dekow) Jim Irby Boronization dekow,irby
CNPA yes Single channel CNPA available as of 12/1707 Dec 17 2007 05:48PM (parker) Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor yes Cryopump is operational Dec 11 2007 10:13AM (labombard) Brian LaBombard Upper Divertor Cryopump irby,labombard
CXRS yes The pedestal toroidal array was installed, spatially and absolutely calibrated. There are 10 chords intersect the beam at the major_R_range=[74.2:86.3]cm. Spatial resolution: 1.2 cm. The F-top poloidal array was installed and spatially calibrated. There are 19 chords intersect the beam at the major_R_range=[67.8:91.0]cm. Spatial resolution: 1.22 cm. Nov 27 2007 10:21AM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,rachmcd,rowan
D Alpha yes \ha2_bright and \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 are available Nov 26 2007 04:23PM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa yes optics repaired, camera re-installed, and view has been re-calibrated Nov 27 2007 09:54AM (marmar) Earl Marmar Visible Bremsstrahlung marmar
Disruption Mitigation no Nov 20 2007 10:47PM (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
DNB no Nov 20 2007 10:47PM (granetz) Robert Granetz Diagnostic Neutral Beam beals,granetz
FRC-ECE no Problem with LO's Jan 10 2008 01:17PM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips
G-Side Ratiomatic yes Gauge is operational and calibrated against G-side MKS on shot#1071127002 Nov 27 2007 01:25PM (labombard) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
GPC yes All 9 channels operational as of new year. Jan 03 2008 09:31AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPC2 yes Most channels operational. Jan 02 2008 12:22PM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPI no Neither the Xpt-view nor the midplane-view camera is operational. Nov 26 2007 04:25PM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes Should be operational for the FY08 campaign Nov 27 2007 09:54AM (marmar) Earl Marmar H/D Ratio marmar
Hirex Jr yes Mar 06 2007 08:59AM (rice) John Rice High Resolution X-Ray ince,rice
Hirex Sr no Be Window has a leak and so the gate valve is closed Nov 23 2007 12:50PM (ince) John Rice High Resolution X-Ray ince,rice
HXR yes Something might be wrong with channel 26; all others working fine. Mar 23 2007 10:43AM (schmidt) Ron Parker Hard X-Ray Array parker,schmidt
ICRF D-Antenna yes available (quarter-wave transformer for pre-matching) Dec 11 2007 09:01AM (ylin) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna yes available (with FFT for automatical matching) Dec 11 2007 09:01AM (ylin) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna yes normally in [0,pi,pi,0] phase for heating. current drive phase available if requested. Dec 11 2007 09:03AM (ylin) Steve Wukitch J-port antenna wukitch,ylin
Lower Hybrid yes Body I Fault Circuits Repaired and tested. High power tests completed Dec 05 2007 06:40PM (dterry) Ron Parker Lower Hybrid dterry,parker
LPI yes 1/9/08 Jan 09 2008 03:23PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha yes Midplane working fine, emissivity profiles being stored in tree, but still need to apply in-vessel calibrations to data. WB1-LY being digitized, but not processed in tree. Dec 09 2007 06:53PM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke
McPherson yes Working fine. Nov 29 2007 01:36PM (mlreinke) Jim Terry VUV Spectrometer mlreinke,terry
Michelson yes Working, moderate speed for now. Jan 02 2008 01:19PM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt
MKS yes E-Top, E-Bottom, F-top (cryo), G-side, and B-bottom are operational. F-top gauge has a 'sniffer tube' to measure pressures in cryopump gas box. Mar 20 2007 06:42PM (g) Brian LaBombard Baratron pressure gauges labombard
MLP no Initial tests on the A-port scanning probe went well. We need to take care of some control glitches that caused some component failures. May 30 2007 08:01PM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard
MSE no We are basically awaiting the DNB & its new aperture. MSE itself is OK. 5 photo detectors have been shipped out for repair, so currently only 5 channels are available. We expect the full channels will be available late in Jan 08. Jan 04 2008 01:11PM (jinseok) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes Voltage is on for the He3 bank. Voltage will be turned on for the global system at the first plasma attempts. Nov 26 2007 08:31AM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes calibration unchanged from 2007 campaign Dec 04 2007 08:56PM (irby) Jim Irby X-Ray/Neutron Detector at K-Hor irby
NINJA yes All capillaries displayed by the NINJA_CONTROL GUI have been tested. Nov 26 2007 04:26PM (terry) Brian LaBombard NINJA gas puff labombard,terry
PCI no Both CO2 and HeNe Lasers are disabled----- safe for machine entry. Sep 14 2007 03:21PM (lianglin) Miklos Porkolab Phase Contrast Imaging edlund,lianglin,ntsujii,porkolab
Penning Gauges yes All gauges except B_DivL are operating Nov 27 2007 01:31PM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational. Nov 26 2007 04:27PM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe
Polarimeter no Safe for Machine Entry Sep 14 2007 12:17PM (irby) Jim Irby C-Mod Polarimeter irby
Probe Array - ISD yes Operational Nov 27 2007 01:40PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH yes Operational Nov 27 2007 01:40PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes Operational Nov 27 2007 01:41PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard
Probe Array - UDIV yes Operational Nov 27 2007 01:41PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer yes 50, 60, 75 and 88GHz channels are connected and being tested for the campaign Dec 18 2007 10:28AM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Operational, but needs to be checked with plasma. Nov 27 2007 01:45PM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP yes FSP is operational Dec 11 2007 10:13AM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP yes A- and K-port WASP electrodes have been replaced/tested. Nov 27 2007 01:44PM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
TCI yes CO2 Laser is on --- initial alignment complete Nov 16 2007 01:23PM (irby) Jim Irby Two-Color Interferometer irby,murray
TS - Core yes 8 polychromators, 1 laser. Density is calibrated for YAG2. YAG1 is not calibrated yet. Jan 17 2008 11:51PM (yma) Jerry Hughes Core Thomson scattering jwhughes,yma
TS - Edge yes System is working. Density is derived with last year's calibration, and should be good to within ~20%. Jan 18 2008 07:27AM (jwhughes) Jerry Hughes Millimeter resolution edge Thomson scattering jwhughes,yma
Vispec no 350 and 670 nm, 4 spatial channels Nov 28 2007 09:58AM (agraf) Alex Graf Visible Spectrometer agraf
XTOMO yes system operational Jan 10 2008 11:41AM (mlreinke) Bob Granetz X-Ray Tomography granetz,mlreinke

Session Leader Comments
Jan 30 2008 09:12:35:307AM	1080130001		repeat of 1080129024 with lower nel - got nice small ELMs from 0.7-0.8 sec, as yesterday. H-mode transition delayed a little, and target density was actually higher than yesterday. Nice shot.
Jan 30 2008 11:28:08:103AM	1080130002		repeat of 1080129026 with higher nel to 7. Good shot, but no small ELMs.
Jan 30 2008 11:29:03:167AM	1080130003		repeat of #1 above and increase Rx from 55.3cm ro 56.5 cm. Actually got 56.7cm but no small ELMs.
Jan 30 2008 12:00:03:170PM	1080130004		repeat of #1 above and decrease Rx from 55.3cm ro 54.3 cm. Actually got 54.7cm but no small ELMs. The small ELM window is really narrow.
Jan 30 2008 12:01:11:860PM	1080130005		repeat of #1 above with target nel of 9. rf did not couple - neutral density too high?
Jan 30 2008 12:01:56:800PM	1080130006		repeat of #1 with target nel=8. Got it - small ELMs show up later in shot.
Jan 30 2008 12:02:23:750PM	1080130007		repeat of last shot - best small ELM signatures of all the shots so far. rf=3.5 MW.
Jan 30 2008 12:02:46:207PM	1080130008		Try for nel=9 - disrupted early.
Jan 30 2008 12:03:55:580PM	1080130009		Go back to target nel=8, with rf=2.4 MW with no J-Port. Good. Nice steady EDA with no sign of small ELMs - this is below the power/beta threshold.
Jan 30 2008 12:04:37:350PM	1080130010		Repeat with max rf=4.5 MW. Good - small ELMs still present, this is high power shot.
Jan 30 2008 12:04:51:113PM	1080130011		Repeat with rf=3.2 MW - fizzle.
Jan 30 2008 12:05:02:223PM	1080130012		Try again - fizzle.
Jan 30 2008 12:41:15:187PM	1080130013		Try again - good shot. 3.1 MW of rf power, very weak signatures of small ELMs. This appears to be right at the lower power threshold for small ELMs.
Jan 30 2008 12:41:38:297PM	1080130014		Go back to 3.6 MW and drop Ip to 0.7 MA - good shot, no small ELMs.
Jan 30 2008 12:44:03:347PM	1080130015		Go back to 3.6 MW and drop Ip to 0.7 MA - good shot, no small ELMs. 0.7 MA is below the Ip threshold.
Jan 30 2008 12:56:32:690PM	1080130016		Go back to 3.6 MW and use Ip of 0.75 MA. Dud - cryo burp.
Jan 30 2008 12:56:58:080PM	1080130017		Try again for 0.75 MA.
Jan 30 2008 02:42:02:343PM	1080130017	Alex Ince-Cushman	Good locked mode discharge (0.6s-1.4s). The off axis rotation channels seem to be locking in two stages (first step at 0.6 and then another at 1.0). For the next shot we will increase the argon puff from 200ms to 300ms. Puff at 1.4s seemed to "un-lock" the shot.
Jan 30 2008 02:41:23:403PM	1080130018	Alex Ince-Cushman	Good locked mode discharge (0.5s-1.5s). A two-staged locking process (similar to the previous shot) was observed.
Jan 30 2008 03:03:42:947PM	1080130021	Alex Ince-Cushman	Shot disrupted at 0.75s. Argon signal levels are good. Sawteeth with periods up to 20ms were observed.
Jan 30 2008 06:12:24:367PM	1080130024	Alex Ince-Cushman	There was not enough argon in the plasma to prevent H-mode transitions. There was a very large swing in rotation (~80km/s) caused by the ~4MW of RF.

Physics Operator Comments
Jan 30 2008 08:45:44:057AM		Robert Granetz	Loaded shot 1080129024, which had segments 1 and 3 active. Decreased nl_04 in segment 3 from 0.7 to 0.6e20 m-2. Set pre-fill pulse length to 60 ms because the cryopump in on.
Jan 30 2008 09:14:46:933AM	1080130001	Robert Granetz	Shot 01 -- Plasma. Good shot. Prf=3.6 MW total from D, E, & J. Cryopump on. Good startup. Got small ELMs. Next shot: load 1080129026, then reload seg 1 with seg 1 from this shot (1080130001). Seg1 and 2 will be active. Increase nl_04 to 0.7e20 m-2.
Jan 30 2008 09:41:12:917AM	1080130002	Robert Granetz	Shot 02 -- Plasma. Good shot. Very slightly different shape at top of plasma results in no ELMs. Three H-modes. Prf=3.6 MW. Good startup. A bit of vertical instability from t=0.7 to 0.8 s. Next shot: Load seg 3 from shot 01 seg 3; turn off seg 2 and turn on seg 3. Increase RXL by 12 mm.
Jan 30 2008 09:50:02:710AM	1080130003	Robert Granetz	Shot 03 -- Plasma. Good shot. Prf=3.5 MW. Three H-modes. No ELMs. Good startup. Next shot: Reload seg 3 from shot 01 seg 3; move RXL in by 1.0 cm.
Jan 30 2008 10:15:34:707AM	1080130004	Robert Granetz	Shot 04 -- Plasma. Good shot. One long EDA H-mode. Prf=3.6 MW. Good startup. Next shot: reload seg 3 from shot 01 seg 3; increase nl_04 to 0.9e20 m-2.
Jan 30 2008 10:23:16:590AM	1080130005	Robert Granetz	Shot 05 -- Plasma. Good shot. D and J didn't go; Prf=0.8 MW. RF doesn't like the higher edge pressure. Good startup. Next shot: repeat, but reduce nl_04 to 0.8e20 m-2.
Jan 30 2008 10:44:27:223AM	1080130006	Robert Granetz	Shot 06 -- Plasma. Disrupted at t=1.17 s. According to Steve Wolfe, it's a problem with RF leakage getting into the EF2 control. Next shot: repeat, except turn off J-port power at t=1.05 s.
Jan 30 2008 10:54:48:423AM	1080130007	Robert Granetz	Shot 07 -- Plasma. Good shot. Prf=3.5 MW (until J turns off at t=1.05 s, as directed). Session leader says, ""best ELMs to date"". Target nl=0.8e20 m-2, as requested. Next shot: increase nl_04 to 0.9e20 m-2. Also increase pre-fill pulse by 3 ms.
Jan 30 2008 11:05:31:733AM	1080130008	Robert Granetz	Shot 08 -- Plasma. Disrupted at t=0.71 s, again due to RF pickup in EF2U. Startup was better. Next shot: decrease nl_04 to 0.8e20 m-2. Only run D and E, but at 2.5 MW.
Jan 30 2008 11:20:07:627AM	1080130009	Robert Granetz	Shot 09 -- Plasma. Good shot. Long EDA H-mode. Prf=2.4 MW from D & E. We kept J-port off in order to avoid problems with EF2 pickup. Target nl_04 = 0.8e20 m-2, as requested. Next shot: repeat, except turn on J-port to get 4+ MW total, hopefully without causing a problem for EF2.
Jan 30 2008 11:40:56:010AM	1080130010	Robert Granetz	Shot 10 -- Plasma. Disrupted at t=1.23 s, again due to EF2/RF problem. Prf=4.5 MW. Wth peaks at 175 kJ. Next shot: repeat, except decrease J-port so that total Prf=3.2 MW, and also turn off J-port at t=1.0 s.
Jan 30 2008 11:45:45:390AM	1080130011	Robert Granetz	Shot 11 -- Fizzle. Post-disruption recovery? Next shot: reduce pre-fill 1 ms (completely superfluous, of course)
Jan 30 2008 11:59:55:013AM	1080130012	Robert Granetz	Shot 12 -- Fizzle again. Next shot: reduce pre-fill another 2 ms.
Jan 30 2008 12:14:47:360PM	1080130013	Robert Granetz	Shot 13 -- Plasma. Good shot. Prf=3.1 MW. Good startup. Next shot: Drop Ip to 0.7 MW; raise Prf to 3.6 MW, and turn off J at t=1.0 s. Keep the density at nl_04=0.8e20 m-2.
Jan 30 2008 12:35:33:260PM	1080130014	Robert Granetz	Shot 14 -- Plasma. Good shot. Ip=0.7 MA. Prf=3.6 MW, with J purposely turning off at t=1.0 s. Good startup. One EDA H-mode. Next shot: increase Ip to 0.75 MA.
Jan 30 2008 12:48:56:807PM	1080130015	Robert Granetz	Shot 15 -- Dud. Cryopump burped, giving a pre-fill pressure of 0.130 mTorr. Next shot: try again.
Jan 30 2008 01:09:48:283PM	1080130016	Robert Granetz	Shot 16 -- Plasma. Disrupted at t=0.77 s, again due to EF2U/RF problem. End of this MP. Next shot will begin MP 520. Next shot: Load shot 1080116016 (locked mode velocity calibration). Reload seg 1 from shot 16 seg 1. Turn off cryopump, and therefore reduce pre-fill to 22 ms.
Jan 30 2008 01:26:51:223PM	1080130017	Robert Granetz	Shot 17 -- Plasma. Good shot. 0.8 MA, 5.4 T, LSN. Ohmic. Got the locked mode (for rotation calibration) at t=0.63 s (A-coil feedback was disabled). Good startup. Next shot: same, except increase argon pulse length to 0.3 s. No cryopump; no ICRF
Jan 30 2008 01:49:15:580PM	1080130018	Robert Granetz	Shot 18 -- Plasma. Good shot. Locked mode starts at t=0.63 s again. Good startup. Next shot: load 1080116021 (USN, 1 MA, nl_04=1.0e20 m-2). Reload startup from 1080130018 seg 1. Turn on cryopump, so also set pre-fill pulse length to 64 ms. Turn on 3 MW of ICRF.
Jan 30 2008 02:26:17:247PM	1080130019	Robert Granetz	Shot 19 -- Plasma. Disrupted at t=0.60 s. EF2/RF problem again. Next shot: decrease nl_04 to 1.0e20 m-2. Have J-port phasing change during the shot. Also reduce pre-fill by 4 ms for disruption recovery.
Jan 30 2008 02:36:19:023PM	1080130020	Robert Granetz	Shot 20 -- Fizzle. Slow Ip ramp...disruption recovery? Next shot: reduce pre-fill another 4 ms.
Jan 30 2008 03:07:50:607PM	1080130021	Robert Granetz	Shot 21 -- Plasma. Disrupted at t=0.76 s, again due to EF2/RF problem. Power room access to shield EF2 control wires and put cabinet doors back on the EF2/EF4/A-coil control cabinet. Next shot: reduce argon plenum pressure to 1.3 psi.
Jan 30 2008 03:13:30:753PM	1080130022	Robert Granetz	Shot 22 -- Fizzle. Disruption recovery blues. Next shot: reduce pre-fill another 4 ms.
Jan 30 2008 03:36:05:553PM	1080130023	Robert Granetz	Shot 23 -- Fizzle. Next shot: reduce pre-fill another 5 ms.
Jan 30 2008 04:03:29:500PM	1080130024	Robert Granetz	Shot 24 -- Plasma. Good shot. Prf=4 MW, but dropping out a lot, resulting in lots of short H-modes. GPC gate valve was not enabled, so no ECE Te. Next shot: Tweak early density; decrease pre-fill another 1 ms. Increase argon plenum pressure to 2.0 psi. Decrease nl_04 to 0.9e20 m-2.
Jan 30 2008 04:27:23:450PM	1080130025	Robert Granetz	Shot 25 -- Plasma. Good shot. Disrupted at t=1.54 s (in rampdown). Got the GPC Te this time, with good sawteeth. Prf=3.5 MW. No problems with EF2/RF pickup. Next shot: reduce pre-fill 3 ms for disruption recovery.
Jan 30 2008 04:51:19:053PM	1080130026	Robert Granetz	Shot 26 -- Plasma. Good shot. Prf=3.5 MW. Large amplitude sawteeth on ECE. Inverted sawteeth on central x-rays (due to the argon). Good startup. Next shot: Increase argon plenum pressure to 2.5 psi.
Jan 30 2008 05:17:02:537PM	1080130027	Robert Granetz	Shot 27 -- Plasma. Disrupted at t=0.67 s. The sawteeth stopped around t=0.53 s. There's a bright reflection(?) on the inboard wall after the disruption on the WIDE2 video. End of run.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:02:59:623AM	Plasma	Ok	No Faults
2	09:26:16:527AM	Plasma	Ok
3	09:42:13:323AM	Plasma	Ok
4	10:01:09:190AM	Plasma	Ok
5	10:16:13:190AM	Plasma	Ok
6	10:29:07:160AM	Plasma	Ok
7	10:45:23:320AM	Plasma	Ok
8	10:59:18:180AM	Plasma	Ok
9	11:12:04:570AM	Plasma	Ok
10	11:27:53:680AM	Plasma	Ok
11	11:42:28:760AM	Plasma	Ok
12	11:55:05:353AM	Plasma	Ok
13	12:07:59:243PM	Plasma	Ok
14	12:25:18:530PM	Plasma	Ok
15	12:43:42:550PM	Plasma	Ok
16	12:57:59:723PM	Plasma	Ok
17	01:17:15:463PM	Plasma	Ok
18	01:40:34:897PM	Plasma	Ok
19	02:05:54:800PM	Plasma	Ok
20	02:27:12:607PM	Plasma	Ok
21	02:47:19:850PM	Plasma	Ok
22	03:10:34:470PM	Plasma	Ok
23	03:30:47:610PM	Plasma	Ok
24	03:48:03:267PM	Plasma	Ok
25	04:12:26:197PM	Plasma	Ok
26	04:40:36:637PM	Plasma	Ok
27	05:08:49:857PM	Plasma	Ok