Alcator C-Mod Run 1070626 Information

Miniproposals

Miniproposal: 489

Date Filed: 4/30/2007

Title: Damping Rate of Toroidal Alfvén Eigenmodes at the Threshold of Stability in the Presence of ICRF He

First Author: Jason Sears

Session Leader: Jason Sears (shots 1-23)

Operators
Session leader(s):	Jason Sears
Physics operator(s):	Bill Rowan
Engineering operator(s):	Bill Cochran,Bill Parkin

Engineering Operator Run Comment
automatically entered by signon - please replace with real comment

Session Leader Plans

Entered: Jun 25 2007 03:06:20:230PM

Author: Jason Sears

Run Plan for 1070626, pm session

MP#489 "Damping rate of TAEs near stability threshold with ICRF fast ions"

Goal
****
Observe the stability of moderate n (~6-14) TAEs relative to the ICRF generated ion tail temperature as the ICRF power is successively increased. This experiment was preliminarily investigated on 1060526 under MP#404a, and was resumed recently on 1070605 with an improved set of magnetic field probes, but with ICRF unable to surpass 2.1MW. Today's run will attempt to extend the ICRF scan to higher power as well as to add statistics in conditions already achieved on 1070605.

Run Preparation
***************
* Prepare argon for HIREX
* Setup GPC2 gratings for 5.9 T
* Enable the dpcs_ftae2 procedure in DPCS (see Wolfe email of 1070601)
* Turn on Active MHD and set qAE to 1.5, AE_order to 2

Run Plan
********
Reload equilibrium from 1070605020.

Shot Plan
*********
Attempt highest possible RF power, hopefully up to 3.5MW, during 0.75-1.5s. Consider modifying nl04 down to 0.6e20 and Ip up to 0.7 MA on recommendation of RF operator for maximum heating efficiency. If J port is not able to operate for the full period, repeat attempt at highest power several times, at least until a good fTAE sweep is obtained during J operation. Then decrease RF power in 0.5 MW steps to 0. The most important shots for this run are those above 2.1MW, which will provide additional data points outside the range of 1070605.

Contingency
***********
If power supply problems prohibit ICRF operation above 2.1MW, repeat the scan from 1070605. Then if time remains, move to diverted and H mode configuration (as in 1051202011) and repeat the power scan from highest available power to 0.

Physics Operators Plans

Entered: Jun 25 2007 07:19:45:463PM

Author: Bill Rowan

Engineering Setup for Tuesday, 26 June 2007; Run 1070626

MP#: 489 "Damping of TAEs w/ICRF tails present"

SL: Jason Sears, Joe Snipes
PO: Bill Rowan

Engineering Setup
------------------
Overnight ECDC in helium at request of SL
Bake at 60 C.

Run begins at 09:00 and ends at 15:00
Run ends at 15:00 for the PSFC barbecue

Power systems as on 1070605020

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)
pump out NINJA and then disable.

Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo shutters
Enable DNB gatevalve if requested by DNB operator.

RF Systems:
----------
ICRF: FMIT#1,2,4 in RUN-ON by 08:30

Diagnostics
----------
DNB: 50 kV, 6A by 09:00

Torvac setup
----------
Gate valves open

Session Leader Summaries

Entered: Jun 26 2007 03:32:08:087PM

Author: Jason Sears

Today was a successful run with some great RF shots. We ended at 3pm for the PSFC barbeque, but still achieved 23 shots and 16 full length discharges. Great job Bill.

We nearly achieved the target RF power, getting up to 3.1MW. Thanks Yijun. More importantly, we observed UNSTABLE TAEs in shots 3 and 4, indicating that we achieved high enough tail energies to drive the total damping rate to zero. Other RF powers between 2 and 3MW were also filled in. The cryopump seemed to be a valuable tool to decrease the neutral pressure in the antenna box and assist in RF operation.

TAEs during RF were hard to observe despite good Active MHD amplifier performance and reasonable signal to noise of the magnetic probes. This could be possibly because they weren't being excited or because they had such low damping rates (and thus exist in very narrow frequency bands) that I missed them in preliminary analysis. With this second possibility in mind, I decreased the Active MHD frequency sweep rate for several shots near the end of the run to expand any low damping rate resonances in time. The system function was certainly not stationary throughout each shot, but did its evolution represent TAEs? More analysis will be necessary to distinguish system resonances (which should be compensated by the standard calibration) from TAEs.

During early shots I found that a very convincing TAE was observed around 0.291s in most shots (before RF started). I took advantage of this reliability by cutting out the Active MHD for a short time starting right at 0.291s. A true resonant mode with a low damping rate will continue to oscillate for several periods when the drive is removed. From time traces, it should be clear whether a resonant mode existed there. I will need to remove the direct coupling component before a conclusion can be made, however.

Finally, in the case that TAEs simply weren't excitable or observable during the RF phase, I increased the current in the last two shots to a more standard 0.8MA in an attempt to bring the q=1.5 surface closer to the Active MHD antennas and magnetic probes.

Shot summary:
*************
001: disruption at 0.7s
002: disruption at 0.7s
003: plasma 3MW unstable modes observed
004: plasma 3MW unstable modes observed
005: plasma 3MW density decreased to 0.65e20 to avoid DE beat
006: plasma 2MW density returned to 0.7e20 (beat wave still avoided)
007: plasma 2MW
008: plasma 2MW
009: plasma 2.7MW
010-014: field supply problems, no plasmas
015: plasma 2.3MW
016: plasma 2.3MW
017: plasma 2.7MW Jport starting at 0.7s
018: plasma 2.3MW Active MHD sweep reduced to 0.75e6 Hz/s
019: plasma 2.8MW
020: plasma 2.8MW Active MHD cutout at 4.5s
021: plasma 2.3MW Active MHD sweep increased back to 1.5e6 Hz/s, cutout at 0.291s
022: plasma 2.3MW increased Ip to 0.8MA
023: plasma 2.2MW, Ip=0.8MA, cutout 0.291-0.292s

Physics Operator Summaries

Entered: Jun 26 2007 03:36:20:137PM

Author: Bill Rowan

The plasmas configuration was limited on the high field side.

The cryopump was used after shot 001 to reduce the neutral gas pressure in the vicinity of J-port antenna. The conventional wisdom (I do not know how well this has been demonstrated) is that the pressure reduction leads to more reliable J-port performance. J-port was reliable today.

A glowing spot on the high field side between G and H ports was correlated with high RF power. This persisted throughout the day but disappeared for the shots with lower RF power.

Two shots disrupted (001 and 002) and several displayed locked modes. The disruptions stopped when the RF was started before time of disruption. Appearance of the locked mode was correlated with RF turn off. The locked mode was removed from the flat top by extending the RF to the end of the flattop.

plasmas
001(disruption),002(disruption),003,004,005,
006,007,008,009,015,016,017,018,019,020,021,
022,023

duds due to power supply failure
010,011,012.

power supply tests
013,014

Scorecard
18 Plasmas
00 Fizzles
00 Duds
03 Duds due to power supply failure
02 Power supply tests
---------------------
23 total

Session Leader Comments

Jun 26 2007 10:38:56:080AM 1070626006 Jason Sears Plasma

Increased density target back to 0.7e20 to try to get unstable mode back. Forgot to mention the change to RF, so only 2MW.

Also, all my previous shot summaries today were under MHD rather than session_leader.

Jun 26 2007 11:01:18:617AM 1070626007 Jason Sears Plasma

Cryopumping from shot 3 for RF performance, and it seems to be working.
RF was 3MW til about 0.7s, then down to 0.5s. Try again to find the unstable mode.

Jun 26 2007 11:16:44:313AM 1070626008 Jason Sears Plasma

ICRF 2MW. No unstable modes.

Jun 26 2007 11:25:27:570AM 1070626009 Jason Sears Plasma

2.7MW RF. No unstable mode

Jun 26 2007 12:10:25:557PM 1070626010 Jason Sears No power shot due to OH2

Jun 26 2007 12:10:41:667PM 1070626011 Jason Sears Dud due to EF3

Jun 26 2007 12:47:21:430PM 1070626012 Jason Sears Dud

Jun 26 2007 12:47:32:960PM 1070626013 Jason Sears Dud

Jun 26 2007 01:12:09:243PM 1070626015 Jason Sears Plasma

2.3MW

Jun 26 2007 01:28:19:553PM 1070626016 Jason Sears Plasma

2.3MW

Jun 26 2007 01:35:57:450PM 1070626017 Jason Sears Plasma

Jport RF starting at 0.7s. Achieved 2.7MW

Jun 26 2007 01:58:38:950PM 1070626018 Jason Sears Plasma

Changed Active MHD sweep rate from 1.5e6 to 750e3, in case resonances during RF are very low damping rate.

2.3MW Rf

Jun 26 2007 02:16:46:327PM 1070626019 Jason Sears Plasma

2.8MW

Jun 26 2007 02:31:49:760PM 1070626020 Jason Sears Plasma

Attempted Active MHD cutout during predicted resonance (ohmic period) at 0.45s. Successful cutout, but it's not clear in the time domain whether the mode continued to ring (or even if I caught the middle of the TAE).
Next shot move to 1.5e6 sweep rate and try the same thing.

2.85MW

Jun 26 2007 02:39:05:157PM 1070626021 Jason Sears Plasma

2.3MW (no Jport)

Achieve Active MHD coutout at 0.291s. Still not sure if Active MHD cutout in the middle of a resonance.

Jun 26 2007 02:46:45:380PM 1070626021 Jason Sears Correction: no D port. Will finish the run with E and J only.

Also, back to 1.5e6 Active MHD sweep rate now.

Jun 26 2007 02:45:27:987PM 1070626022 Jason Sears Plasma

2.3 MW

Moved current to 0.8MA to see if resonances come out toward the Active MHD antenna a little.

Also no cutout, looking for a resonance during ohmic around 0.29s, to cutout in the next shot.

Jun 26 2007 02:57:29:357PM 1070626023 Jason Sears Plasma

cutout at 0.291-0.292

Ip=0.8MA
Picrf=2.2MW

Physics Operator Comments

Jun 26 2007 07:50:33:263AM Bill Rowan The beam will not be available today. Bob reported that the breaker is out. The beam was not requested by the SL for today, but it will be needed later in the week. Will wait until Dexter has an opportunity to look at this.

Jun 26 2007 08:20:45:380AM Bill Rowan Loaded 1070605020.

The shot loaded was cryopumped.

SL has requested cryopumping if available. Jim is checking.

Import segment 1 from 1070622020. This is a cryo pumped shot. Will change the prefill if cryopumping is not available. Earlier in run 1070622, when cryopump was not on, the prefill was set to 18 ms. Will use that if there is no cryo on the first shot.

Jun 26 2007 08:24:24:870AM Bill Rowan
The dpcs_ftae2 procedure is already turned on so I will do nothing.

Jun 26 2007 08:26:43:400AM Bill Rowan Enabled PG1, B-side lower for the first shot. SL request

Jun 26 2007 08:59:04:960AM Bill Rowan Reduced the prefill to 18 ms since there will be no cryo on the first shot.

Jun 26 2007 09:57:59:987AM 1070626001 Bill Rowan 001. Disruption at 0.7 s

Next shot.
Loaded B21_PROJ form wire 9 segment 2 of shot 1070622020
Try again.

Jun 26 2007 09:58:10:110AM 1070626002 Bill Rowan 002. Disruption at 0.7 s

Next shot.
Move the RF earlier. To 0.5 s.
Cryopump on for the next shot.
Increase the prefill to 32 ms

Jun 26 2007 09:57:26:863AM 1070626003 Bill Rowan 003. Plasma
locked mode at 1.3s
cryopump is on
something glowing on the inner wall between G and H

Next shot.
Moved integrator gate on segment 2 back to 0.2 s
Zeroed ACOIL_CUR

Jun 26 2007 10:07:59:543AM 1070626004 Bill Rowan 004. Plasma
Locked mode turns on as RF is turned off.
Still see a glow between G and H

Next shot.
Try to increase the length of the RF. What happens to the locked mode.

Jun 26 2007 10:10:16:997AM 1070626004 Bill Rowan Decrease nl_04 to 6.5 e+19

Jun 26 2007 10:18:32:207AM 1070626005 Bill Rowan 005. Plasma
Locked mode followed RF

Jun 26 2007 10:26:51:587AM 1070626005 Bill Rowan Next shot.
reloaded shot 004

Jun 26 2007 10:34:59:953AM 1070626006 Bill Rowan 006. Plasma
RF drop out at 1.25 s

Next shot.
repeat for more power

Jun 26 2007 10:37:46:970AM 1070626006 Bill Rowan add a second argon puff. 50 ms at 0.7 s

Jun 26 2007 10:53:40:150AM 1070626007 Bill Rowan 007. Plasma

Next shot.
No PCS changes. Repeat for higher RF power

Jun 26 2007 11:22:55:740AM 1070626008 Bill Rowan 008. Plasma

Next shot

Jun 26 2007 11:25:47:930AM 1070626009 Bill Rowan 009. Plasma

Next shot.
No PCS changes

Jun 26 2007 11:52:55:340AM 1070626010 Bill Rowan 010. No power shot. OH2 fault.
Interlock problem on OH2 power supply

Next shot.
No PCS changes

Jun 26 2007 12:04:45:320PM 1070626011 Bill Rowan 011. Dud due to power supplies. No EF3
PLC failure

Next shot.
No PCS changes

Jun 26 2007 12:13:08:527PM 1070626012 Bill Rowan 012. Dud due to power supply. No EF3

Jun 26 2007 12:39:02:127PM 1070626013 Bill Rowan 013. EF3 test. No EF3.

Jun 26 2007 12:51:30:853PM 1070626014 Bill Rowan 014. EF3 test. Successful

Next shot.
Try for plasma

Jun 26 2007 01:04:39:270PM 1070626015 Bill Rowan 015. Plasma

Next shot.
Repeat for higher RF power

Jun 26 2007 01:26:37:927PM 1070626016 Bill Rowan 016. Plasma

Next shot.
No dpcs changes

Jun 26 2007 01:36:18:840PM 1070626017 Bill Rowan 017. Plasma

Next shot.
No DPCS changes

Jun 26 2007 01:49:40:507PM 1070626018 Bill Rowan 018. Plasma

Jun 26 2007 01:52:09:353PM 1070626018 Bill Rowan
Next shot.
No DPCS changes.

Jun 26 2007 02:12:00:777PM 1070626019 Bill Rowan 019. Plasma

Next shot.
No DPCS changes

Jun 26 2007 02:21:27:313PM 1070626020 Bill Rowan 020. Plasma

Next shot.
No DPCS changes

Jun 26 2007 02:38:51:717PM 1070626021 Bill Rowan 021. Plasma

Next shot.
IP=800 kA.

Jun 26 2007 02:56:33:323PM 1070626022 Bill Rowan 022. Plasma

Next shot.
No DPCS changes

Jun 26 2007 02:56:19:183PM 1070626023 Bill Rowan 023. Plasma

Last shot

Engineering Operator Comments

Shot Time Type Status Comment

1 09:05:28:447AM Plasma Ok

2 09:27:59:153AM Plasma Ok

3 09:43:16:320AM Plasma Ok

4 10:00:30:393AM Plasma Ok

5 10:13:54:373AM Plasma Ok

6 10:29:32:637AM Plasma Ok

7 10:47:31:773AM Plasma Ok

8 11:06:14:010AM Plasma Ok

9 11:20:19:610AM Plasma Ok

10 11:34:22:530AM Plasma Bad No Power shot, OH2U door fault

11 11:56:19:593AM Plasma Bad EF3 did not fire, no PLC pulse

12 12:09:41:697PM Plasma Bad No Ef3

13 12:36:50:640PM Test Bad EF3, no plc pulse

14 12:47:26:727PM Test Ok EF3 test OK

15 01:00:15:093PM Plasma Ok

16 01:13:34:900PM Plasma Ok

17 01:27:59:397PM Plasma Ok

18 01:47:08:287PM Plasma Ok

19 01:59:55:313PM Plasma Ok

20 02:14:54:527PM Plasma Ok

21 02:27:36:663PM Plasma Ok

22 02:41:09:627PM Plasma Ok

23 02:54:04:090PM Plasma Ok

System Availability

Jun 26 2007 09:05:03:900AM

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
Bolometers yes 2Pi diode operational, 2Pi foil being upgrade for noise resistance. Midplane foils calibrated for senstivity, still need better time constants. Midplane and divertor AXUV being digitized, processing calibration data. May 29 2007 11:22AM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization yes First Boronization 5/9/07 May 10 2007 04:55PM (irby) Jim Irby Boronization dekow,irby
CNPA no Jan 14 2007 02:06PM Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor yes The cryopump is operational in a manual mode. We will be working on interfacing its control system with the C-Mod state machine for semi-automatic operation. May 30 2007 07:58PM (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=[75,4:87.4]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. Jun 20 2007 05:35PM (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 Mar 11 2007 10:28PM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa yes camera is re-installed, and view has been calibrated Feb 26 2007 03:28PM (marmar) Earl Marmar Visible Bremsstrahlung marmar
Disruption Mitigation no Jan 14 2007 02:02PM Bob 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,ldorf,terry
DNB yes All systems are operational, but as of 28 March 2007, the beam needs additional conditioning for full performance shots Mar 28 2007 09:36AM (beals) Bob Granetz Diagnostic Beam beals,granetz
FRC-ECE no Only high frequency channels now working (17 to 32). LO looks good. Most likely it is the 5V supply for mixer bais and amp that is the problem. Jun 20 2007 09:23AM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips
G-Side Ratiomatic yes The gauge is operational. Mar 30 2007 10:54AM (labombard) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
GPC yes Chs 1-8 operational. May 24 2007 08:40AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPC2 yes Most channels (except 1,5,8,10,17) operational. Jun 08 2007 08:29AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPI yes New view just outside of the lower X-point is operational, but data is being archived locally , not to the tree. Midplane GPI is not operational. Mar 27 2007 01:59PM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes spectral calibration needs to be checked, but system should be ready for the run Feb 26 2007 03:28PM (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 yes Storing Data, but profiles not yet available Apr 27 2007 01:20PM (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 80.5 MHz. Max power is about 1.5 MW Jun 20 2007 09:23AM (ylin) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna yes 80 MHz. Maxc power is about 1.5 MW Jun 20 2007 09:23AM (ylin) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna yes 78 MHz. dipole configuration. Using #4 transmitter only. Max power about 1.5 MW instead of 3 MW. Jun 20 2007 09:22AM (ylin) Steve Wukitch J-port antenna wukitch,ylin
Lower Hybrid no 6B Pressure window failed. Arcing in 6B, 8B,9B & 23B. May 04 2007 03:44PM (dterry) Ron Parker Lower Hybrid dterry,parker
LPI yes Apr 26 2007 08:35PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha yes Midplane data being digitized, processing calibration data. Divertor views showing significant noise, and not available. Upper view being debugged. May 29 2007 11:23AM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke
McPherson yes Working normally. Apr 19 2007 09:52AM (mlreinke) Jim Terry VUV Spectrometer mlreinke,terry
Michelson yes Operational. Mar 28 2007 08:33AM (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 (1) Bandpass filters replacement underway (2) Beam-into-gas spectrum measurement underway (3) Shutter mechanism currently unstable; remains open. (4) Expect beam-into-gas calibrations complete about 4/24. Apr 03 2007 12:05PM (sscott) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes Both neutron systems are fully operational Apr 05 2007 11:19AM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes operational Mar 21 2007 04:29PM (irby) Jim Irby X-Ray/Neutron Detector at K-Hor irby
NINJA yes All capillaries displayed by the NINJA_CONTROL GUI have been tested. NINJA puffed on 1070329009 (A-B limiter). Mar 29 2007 11:47AM (terry) Brian LaBombard NINJA gas puff labombard,terry
PCI yes The system is to be optimized. May 30 2007 01:12PM (lianglin) Miklos Porkolab Phase Contrast Imaging edlund,lianglin,ntsujii,porkolab
Penning Gauges yes 8 in-situ Penning ionization gauges appear to be operational: CB_DivU, CB_OutL, CB_DivL, KA_OutU, KA_OutL, B_DivL, Cryo_1, Cryo_2. Cryo_1 and Cryo_2 are new and installed in the upper cryopump 'gas-box'. Mar 13 2007 10:01PM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV (without an ND filter) are operational. Mar 27 2007 01:53PM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe
Polarimeter no Retro shutter closed Mar 15 2007 11:00AM (irby) Jim Irby C-Mod Polarimeter irby
Probe Array - ISD yes Probes at 15 of the 16 poloidal locations ('ramped' geometry) are operational. n,Te, particle flux reported every 10 ms. Mar 13 2007 09:47PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH yes All 6 probes on the lower hybrid launcher (tungsten, 1.5 mm projection) are operational. Mar 13 2007 09:46PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes Probes at 10 poloidal locations (one 'ramped' and one 'flush') are operational. n,Te, particle flux reported every 10 ms. Mar 13 2007 09:45PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard
Probe Array - UDIV yes 14 probes are operational ('ramped' geometry). n,Te, particle flux reported every 10 ms.Two high-gain channels are installed and operational for ECDC plasma diagnosis. Mar 13 2007 12:46PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer yes All low frequency channels (50, 60, 75, 88, 88u, 88l and 110) have been installed (for the first time!) on 1070626. Thery are being tested. The PPPL variable frequency channel is installed and being run (for now) at fixed frequency (Voltage set at 6V). 140GHz channel still down. Jun 26 2007 08:30AM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Perpendicular Mach probe head is installed. The drive is operational. Mar 15 2007 09:09PM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP yes Perpendicular Mach probe head is installed. The probe drive is now operational. Mar 13 2007 09:51PM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP yes A-port WASP successfully collected data on 04/04. Some intermittent open circuit on SE Electrode. K-WASP took data on 04/11. Both ready to scan as needed. Apr 12 2007 04:18PM (nsmick) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
TCI yes NL_04 at 71.04 cm from 3/9/07 calibration May 23 2007 07:38AM (irby) Jim Irby Two-Color Interferometer irby,murray
TS - Core yes 2 lasers, 11 spatial channels. Density is calibrated based on ECE cutoffs obtained on 4 May 2007. Additional spatial channels will be added over the next several weeks. May 10 2007 10:37AM (jwhughes) Jerry Hughes Core Thomson scattering jwhughes
TS - Edge yes 2 lasers, 20 spatial channels. Fiber holder position is -124.5mm (standard). Density is calibrated according to Raman scattering results from 26 May, supplemented with ECE cutoffs obtained on shot 1070531015. Jun 14 2007 06:21PM (jwhughes) Jerry Hughes Millimeter resolution edge Thomson scattering jwhughes
Vispec yes 350 and 670 nm, 4 spatial channels May 04 2007 01:02PM (agraf) Alex Graf Visible Spectrometer agraf

Jun 26 2007 10:47:08:013AM

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
Bolometers yes 2Pi diode operational, 2Pi foil being upgrade for noise resistance. Midplane foils calibrated for senstivity, still need better time constants. Midplane and divertor AXUV being digitized, processing calibration data. May 29 2007 11:22AM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization yes First Boronization 5/9/07 May 10 2007 04:55PM (irby) Jim Irby Boronization dekow,irby
CNPA no Jan 14 2007 02:06PM Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor yes The cryopump is operational in a manual mode. We will be working on interfacing its control system with the C-Mod state machine for semi-automatic operation. May 30 2007 07:58PM (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=[75,4:87.4]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. Jun 20 2007 05:35PM (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 Mar 11 2007 10:28PM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa yes camera is re-installed, and view has been calibrated Feb 26 2007 03:28PM (marmar) Earl Marmar Visible Bremsstrahlung marmar
Disruption Mitigation no Jan 14 2007 02:02PM Bob 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,ldorf,terry
DNB yes All systems are operational, but as of 28 March 2007, the beam needs additional conditioning for full performance shots Mar 28 2007 09:36AM (beals) Bob Granetz Diagnostic Beam beals,granetz
FRC-ECE no Only high frequency channels now working (17 to 32). LO looks good. Most likely it is the 5V supply for mixer bais and amp that is the problem. Jun 20 2007 09:23AM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips
G-Side Ratiomatic yes The gauge is operational. Mar 30 2007 10:54AM (labombard) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
GPC yes Chs 1-8 operational. May 24 2007 08:40AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPC2 yes Most channels (except 1,5,8,10,17) operational. Jun 08 2007 08:29AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPI yes New view just outside of the lower X-point is operational, but data is being archived locally , not to the tree. Midplane GPI is not operational. Mar 27 2007 01:59PM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes spectral calibration needs to be checked, but system should be ready for the run Feb 26 2007 03:28PM (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 yes Storing Data, but profiles not yet available Apr 27 2007 01:20PM (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 80.5 MHz. Max power is about 1.5 MW Jun 20 2007 09:23AM (ylin) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna yes 80 MHz. Maxc power is about 1.5 MW Jun 20 2007 09:23AM (ylin) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna yes 78 MHz. dipole configuration. Using #4 transmitter only. Max power about 1.5 MW instead of 3 MW. Jun 20 2007 09:22AM (ylin) Steve Wukitch J-port antenna wukitch,ylin
Lower Hybrid no 6B Pressure window failed. Arcing in 6B, 8B,9B & 23B. May 04 2007 03:44PM (dterry) Ron Parker Lower Hybrid dterry,parker
LPI yes Apr 26 2007 08:35PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha yes Midplane data being digitized, processing calibration data. Divertor views showing significant noise, and not available. Upper view being debugged. May 29 2007 11:23AM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke
McPherson yes Working normally. Apr 19 2007 09:52AM (mlreinke) Jim Terry VUV Spectrometer mlreinke,terry
Michelson yes Operational. Mar 28 2007 08:33AM (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 (1) Bandpass filters replacement underway (2) Beam-into-gas spectrum measurement underway (3) Shutter mechanism currently unstable; remains open. (4) Expect beam-into-gas calibrations complete about 4/24. Apr 03 2007 12:05PM (sscott) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes Both neutron systems are fully operational Apr 05 2007 11:19AM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes operational Mar 21 2007 04:29PM (irby) Jim Irby X-Ray/Neutron Detector at K-Hor irby
NINJA yes All capillaries displayed by the NINJA_CONTROL GUI have been tested. NINJA puffed on 1070329009 (A-B limiter). Mar 29 2007 11:47AM (terry) Brian LaBombard NINJA gas puff labombard,terry
PCI yes The system is to be optimized. May 30 2007 01:12PM (lianglin) Miklos Porkolab Phase Contrast Imaging edlund,lianglin,ntsujii,porkolab
Penning Gauges yes 8 in-situ Penning ionization gauges appear to be operational: CB_DivU, CB_OutL, CB_DivL, KA_OutU, KA_OutL, B_DivL, Cryo_1, Cryo_2. Cryo_1 and Cryo_2 are new and installed in the upper cryopump 'gas-box'. Mar 13 2007 10:01PM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV (without an ND filter) are operational. Mar 27 2007 01:53PM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe
Polarimeter no Retro shutter closed Mar 15 2007 11:00AM (irby) Jim Irby C-Mod Polarimeter irby
Probe Array - ISD yes Probes at 15 of the 16 poloidal locations ('ramped' geometry) are operational. n,Te, particle flux reported every 10 ms. Mar 13 2007 09:47PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH yes All 6 probes on the lower hybrid launcher (tungsten, 1.5 mm projection) are operational. Mar 13 2007 09:46PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes Probes at 10 poloidal locations (one 'ramped' and one 'flush') are operational. n,Te, particle flux reported every 10 ms. Mar 13 2007 09:45PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard
Probe Array - UDIV yes 14 probes are operational ('ramped' geometry). n,Te, particle flux reported every 10 ms.Two high-gain channels are installed and operational for ECDC plasma diagnosis. Mar 13 2007 12:46PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer yes All low frequency channels (50, 60, 75, 88, 88u, 88l and 110) have been installed (for the first time!) on 1070626. Thery are being tested. The PPPL variable frequency channel is installed and being run (for now) at fixed frequency (Voltage set at 6V). 140GHz channel still down. Throughout the day (1070626), the 50GHz channel hasn't worked properly. Jun 26 2007 10:44AM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Perpendicular Mach probe head is installed. The drive is operational. Mar 15 2007 09:09PM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP yes Perpendicular Mach probe head is installed. The probe drive is now operational. Mar 13 2007 09:51PM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP yes A-port WASP successfully collected data on 04/04. Some intermittent open circuit on SE Electrode. K-WASP took data on 04/11. Both ready to scan as needed. Apr 12 2007 04:18PM (nsmick) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
TCI yes NL_04 at 71.04 cm from 3/9/07 calibration May 23 2007 07:38AM (irby) Jim Irby Two-Color Interferometer irby,murray
TS - Core yes 2 lasers, 11 spatial channels. Density is calibrated based on ECE cutoffs obtained on 4 May 2007. Additional spatial channels will be added over the next several weeks. May 10 2007 10:37AM (jwhughes) Jerry Hughes Core Thomson scattering jwhughes
TS - Edge yes 2 lasers, 20 spatial channels. Fiber holder position is -124.5mm (standard). Density is calibrated according to Raman scattering results from 26 May, supplemented with ECE cutoffs obtained on shot 1070531015. Jun 14 2007 06:21PM (jwhughes) Jerry Hughes Millimeter resolution edge Thomson scattering jwhughes
Vispec yes 350 and 670 nm, 4 spatial channels May 04 2007 01:02PM (agraf) Alex Graf Visible Spectrometer agraf

Session Leader Comments
Jun 26 2007 10:38:56:080AM	1070626006	Jason Sears	Plasma Increased density target back to 0.7e20 to try to get unstable mode back. Forgot to mention the change to RF, so only 2MW. Also, all my previous shot summaries today were under MHD rather than session_leader.
Jun 26 2007 11:01:18:617AM	1070626007	Jason Sears	Plasma Cryopumping from shot 3 for RF performance, and it seems to be working. RF was 3MW til about 0.7s, then down to 0.5s. Try again to find the unstable mode.
Jun 26 2007 11:16:44:313AM	1070626008	Jason Sears	Plasma ICRF 2MW. No unstable modes.
Jun 26 2007 11:25:27:570AM	1070626009	Jason Sears	Plasma 2.7MW RF. No unstable mode
Jun 26 2007 12:10:25:557PM	1070626010	Jason Sears	No power shot due to OH2
Jun 26 2007 12:10:41:667PM	1070626011	Jason Sears	Dud due to EF3
Jun 26 2007 12:47:21:430PM	1070626012	Jason Sears	Dud
Jun 26 2007 12:47:32:960PM	1070626013	Jason Sears	Dud
Jun 26 2007 01:12:09:243PM	1070626015	Jason Sears	Plasma 2.3MW
Jun 26 2007 01:28:19:553PM	1070626016	Jason Sears	Plasma 2.3MW
Jun 26 2007 01:35:57:450PM	1070626017	Jason Sears	Plasma Jport RF starting at 0.7s. Achieved 2.7MW
Jun 26 2007 01:58:38:950PM	1070626018	Jason Sears	Plasma Changed Active MHD sweep rate from 1.5e6 to 750e3, in case resonances during RF are very low damping rate. 2.3MW Rf
Jun 26 2007 02:16:46:327PM	1070626019	Jason Sears	Plasma 2.8MW
Jun 26 2007 02:31:49:760PM	1070626020	Jason Sears	Plasma Attempted Active MHD cutout during predicted resonance (ohmic period) at 0.45s. Successful cutout, but it's not clear in the time domain whether the mode continued to ring (or even if I caught the middle of the TAE). Next shot move to 1.5e6 sweep rate and try the same thing. 2.85MW
Jun 26 2007 02:39:05:157PM	1070626021	Jason Sears	Plasma 2.3MW (no Jport) Achieve Active MHD coutout at 0.291s. Still not sure if Active MHD cutout in the middle of a resonance.
Jun 26 2007 02:46:45:380PM	1070626021	Jason Sears	Correction: no D port. Will finish the run with E and J only. Also, back to 1.5e6 Active MHD sweep rate now.
Jun 26 2007 02:45:27:987PM	1070626022	Jason Sears	Plasma 2.3 MW Moved current to 0.8MA to see if resonances come out toward the Active MHD antenna a little. Also no cutout, looking for a resonance during ohmic around 0.29s, to cutout in the next shot.
Jun 26 2007 02:57:29:357PM	1070626023	Jason Sears	Plasma cutout at 0.291-0.292 Ip=0.8MA Picrf=2.2MW

Physics Operator Comments
Jun 26 2007 07:50:33:263AM		Bill Rowan	The beam will not be available today. Bob reported that the breaker is out. The beam was not requested by the SL for today, but it will be needed later in the week. Will wait until Dexter has an opportunity to look at this.
Jun 26 2007 08:20:45:380AM		Bill Rowan	Loaded 1070605020. The shot loaded was cryopumped. SL has requested cryopumping if available. Jim is checking. Import segment 1 from 1070622020. This is a cryo pumped shot. Will change the prefill if cryopumping is not available. Earlier in run 1070622, when cryopump was not on, the prefill was set to 18 ms. Will use that if there is no cryo on the first shot.
Jun 26 2007 08:24:24:870AM		Bill Rowan	The dpcs_ftae2 procedure is already turned on so I will do nothing.
Jun 26 2007 08:26:43:400AM		Bill Rowan	Enabled PG1, B-side lower for the first shot. SL request
Jun 26 2007 08:59:04:960AM		Bill Rowan	Reduced the prefill to 18 ms since there will be no cryo on the first shot.
Jun 26 2007 09:57:59:987AM	1070626001	Bill Rowan	001. Disruption at 0.7 s Next shot. Loaded B21_PROJ form wire 9 segment 2 of shot 1070622020 Try again.
Jun 26 2007 09:58:10:110AM	1070626002	Bill Rowan	002. Disruption at 0.7 s Next shot. Move the RF earlier. To 0.5 s. Cryopump on for the next shot. Increase the prefill to 32 ms
Jun 26 2007 09:57:26:863AM	1070626003	Bill Rowan	003. Plasma locked mode at 1.3s cryopump is on something glowing on the inner wall between G and H Next shot. Moved integrator gate on segment 2 back to 0.2 s Zeroed ACOIL_CUR
Jun 26 2007 10:07:59:543AM	1070626004	Bill Rowan	004. Plasma Locked mode turns on as RF is turned off. Still see a glow between G and H Next shot. Try to increase the length of the RF. What happens to the locked mode.
Jun 26 2007 10:10:16:997AM	1070626004	Bill Rowan	Decrease nl_04 to 6.5 e+19
Jun 26 2007 10:18:32:207AM	1070626005	Bill Rowan	005. Plasma Locked mode followed RF
Jun 26 2007 10:26:51:587AM	1070626005	Bill Rowan	Next shot. reloaded shot 004
Jun 26 2007 10:34:59:953AM	1070626006	Bill Rowan	006. Plasma RF drop out at 1.25 s Next shot. repeat for more power
Jun 26 2007 10:37:46:970AM	1070626006	Bill Rowan	add a second argon puff. 50 ms at 0.7 s
Jun 26 2007 10:53:40:150AM	1070626007	Bill Rowan	007. Plasma Next shot. No PCS changes. Repeat for higher RF power
Jun 26 2007 11:22:55:740AM	1070626008	Bill Rowan	008. Plasma Next shot
Jun 26 2007 11:25:47:930AM	1070626009	Bill Rowan	009. Plasma Next shot. No PCS changes
Jun 26 2007 11:52:55:340AM	1070626010	Bill Rowan	010. No power shot. OH2 fault. Interlock problem on OH2 power supply Next shot. No PCS changes
Jun 26 2007 12:04:45:320PM	1070626011	Bill Rowan	011. Dud due to power supplies. No EF3 PLC failure Next shot. No PCS changes
Jun 26 2007 12:13:08:527PM	1070626012	Bill Rowan	012. Dud due to power supply. No EF3
Jun 26 2007 12:39:02:127PM	1070626013	Bill Rowan	013. EF3 test. No EF3.
Jun 26 2007 12:51:30:853PM	1070626014	Bill Rowan	014. EF3 test. Successful Next shot. Try for plasma
Jun 26 2007 01:04:39:270PM	1070626015	Bill Rowan	015. Plasma Next shot. Repeat for higher RF power
Jun 26 2007 01:26:37:927PM	1070626016	Bill Rowan	016. Plasma Next shot. No dpcs changes
Jun 26 2007 01:36:18:840PM	1070626017	Bill Rowan	017. Plasma Next shot. No DPCS changes
Jun 26 2007 01:49:40:507PM	1070626018	Bill Rowan	018. Plasma
Jun 26 2007 01:52:09:353PM	1070626018	Bill Rowan	Next shot. No DPCS changes.
Jun 26 2007 02:12:00:777PM	1070626019	Bill Rowan	019. Plasma Next shot. No DPCS changes
Jun 26 2007 02:21:27:313PM	1070626020	Bill Rowan	020. Plasma Next shot. No DPCS changes
Jun 26 2007 02:38:51:717PM	1070626021	Bill Rowan	021. Plasma Next shot. IP=800 kA.
Jun 26 2007 02:56:33:323PM	1070626022	Bill Rowan	022. Plasma Next shot. No DPCS changes
Jun 26 2007 02:56:19:183PM	1070626023	Bill Rowan	023. Plasma Last shot

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:05:28:447AM	Plasma	Ok
2	09:27:59:153AM	Plasma	Ok
3	09:43:16:320AM	Plasma	Ok
4	10:00:30:393AM	Plasma	Ok
5	10:13:54:373AM	Plasma	Ok
6	10:29:32:637AM	Plasma	Ok
7	10:47:31:773AM	Plasma	Ok
8	11:06:14:010AM	Plasma	Ok
9	11:20:19:610AM	Plasma	Ok
10	11:34:22:530AM	Plasma	Bad	No Power shot, OH2U door fault
11	11:56:19:593AM	Plasma	Bad	EF3 did not fire, no PLC pulse
12	12:09:41:697PM	Plasma	Bad	No Ef3
13	12:36:50:640PM	Test	Bad	EF3, no plc pulse
14	12:47:26:727PM	Test	Ok	EF3 test OK
15	01:00:15:093PM	Plasma	Ok
16	01:13:34:900PM	Plasma	Ok
17	01:27:59:397PM	Plasma	Ok
18	01:47:08:287PM	Plasma	Ok
19	01:59:55:313PM	Plasma	Ok
20	02:14:54:527PM	Plasma	Ok
21	02:27:36:663PM	Plasma	Ok
22	02:41:09:627PM	Plasma	Ok
23	02:54:04:090PM	Plasma	Ok