Alcator C-Mod Run 1070613 Information

Miniproposals

Miniproposal: 473

Date Filed: 3/9/2007

Title: Lower Hybrid System Check-out and Initial operation

First Author: J. Randall Wilson

Session Leader: Greg Wallace (shots 1-28)

Operators
Session leader(s):	Greg Wallace
Physics operator(s):	Robert Granetz
Engineering operator(s):	Bill Cochran,Bill Byford,Sam Pierson

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

Session Leader Plans

Entered: Jun 12 2007 01:20:25:193PM

Author: Greg Wallace

Session Leader Plan for 1070613: MP473 "LH System Checkout and Initial Operation"

The purpose of today's run will be to try to increase the LH power and
pulselength to greater than 600kW for 500ms. MSE will be attempting to measure
a change in the current profile when LH is on. This will be a repeat of 1070606
which was scrubbed due to computer failure.

Starting shot will be 1070606003, but decreasing target density to 5e19 m^-3.
Set launcher to 1.5mm behind limiter and set phase shifters to 90deg current
drive direction. LH will fire from 800ms to 1300ms.

We will be staying at 5.5T all day for MSE.

Start with ~400kW of LH power at 90 degree ideal phasing. Check to make sure
the CPS is working correctly and we are not arcing in the waveguides. Increase
power to 600kW then 800+kW. We will be looking for clean (no/minimal trips) LH
pulses from .8-1.3s. It will require some tweaking to the drive level of the
individual klystrons to increase the power level.

Cell Access to change phase shifters to 0 degrees.

Run 500ms shots with the first half in co-current-drive and the second half in
counter-current-drive, 120 degree approximate phasing in both cases, at the
maximum power level we can achieve without too many trips. This should give an
n|| spectrum similar to 60 degree ideal phasing, but with a slightly wider
spectral peak. We would like to see some changes with MSE between the co- and
counter-current-drive segments. We expect that getting the system to run in
this configuration will be a bit tricky, especially since we have no experience
running higher power in counter-current-drive configuration.

Physics Operators Plans

Entered: Jun 12 2007 02:51:05:050PM

Author: Robert Granetz

Engineering setup for Wednesday 13 June 2007 MP#473 LH operation Session leaders: G. Wallace Physics operator: R. Granetz ECDC overnight in D2, pressure=2e-4 Torr. Rmin/Rdwell/Rmax = 44/45/103 cm. Bake at 60 C. Power systems as on 1070606003. A-coil configuration: normal [Dtop -Dbot -Jtop +Jbot] and 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) pumpout NINJA and leave DISABLED Enable the following gate valves and shutters, assuming no vacuum problems: ECE, VUV, Z-bolo shutters. Enable DNB gate valve when requested by DNB operator. Torvac setup: Gate valves open Specific diagnostics: DNB and MSE to measure q-profiles, or at least changes in current profile due to LHCD ------------------------------------------------------------------------------- Cryopump: If possible, ready to operate with plasma in the afternoon. ICRF Setup: No ICRF for this run. LH Setup: max power for 0.5 seconds or more; current drive phasing ------------------------------------------------------------------------------- Run plan: see session leader plan

Session Leader Summaries

Entered: Jun 13 2007 05:30:15:033PM

Author: Greg Wallace

Summary for 1070613

Much better results than last week with respect to increasing LH power. Fixing
the phaseshifter settings on cart 3 helped dramatically with the reflections on 17
which were preventing long pulses previously.

We had several good shots (4-8, 15, 16, 20, all at 90 deg phasing) with minimal
trips and ~.5V reduction in loop voltage and signs of q-profile change from MSE.
Maximum sustained power of 725kW on shot 20 is a substantial improvement over last
week. There are still problems with arcing in several waveguides, notably 7-10
and 23 on the C row where the gasket is known to be misaligned.

Switched to 60 degree phasing after shot 20 but did not have much luck. The
intrinsic reflection on waveguides 9 & 23, in addition to some arcing issues on
klystron 5 waveguides, prevented sustained high power operation at 60. The final
two shots were an attempt to run low n|| in both the co- and counter-current
directions during the same pulse. (This can be achieved by setting the mechanical
phase shifters to 0 and running 120 degree phasing co- and counter-current, which
essentially creates a waveguide which is twice as wide, which at twice the phase
progression gives the same n||.) Ultimately these shots did not run sucessfully
due to the CPS tripping on high reflections on waveguide 6 Top.

Physics Operator Summaries

Entered: Jun 13 2007 05:11:59:533PM

Author: Robert Granetz

Run summary for Wednesday 13 June 2007 MP 473: LH operation Session leader: G. Wallace Physics operator: R. Granetz The machine ran very reliably today. Nearly all shots were full-length plasmas. The lower hybrid ran well on a number of shots, some with LH power exceeding 700 kW. However, faulting of the LH continued to be a problem on the majority of shots. The DNB ran flawlessly on all shots. Most notably, MSE clearly saw a change in pitch angle during LH current drive on several mid-radii channels, with little change seen on core channels. Very promising. Scorecard: 28 plasmas 0 duds 0 fizzles 0 power supply tests 0 no-power MDS shot cycles -------------- Total: 28 shot cycles

Session Leader Comments

Jun 13 2007 09:20:37:820AM 1070613001 Greg Wallace LH trips out on all segments. Problem appears to be 21T. Edge density reading 2-3e19 looks good. nl04 of 5e19.

Jun 13 2007 09:30:17:350AM 1070613002 Greg Wallace More trips. Cart 1&2 did not fire due to fault from previous shot not being cleared. Next shot will change phase on klystron 11 by -10 degrees.

Jun 13 2007 09:42:07:507AM 1070613003 Greg Wallace Reflections on 21T worse than before. Moving phase in this direction did not work. Will try increasing phase on klystron 11 by 15 degrees compared to "normal" on the next shot.

Jun 13 2007 10:05:04:127AM 1070613004 Greg Wallace Good shot! LH ran full length with no trips. +15 degrees on klystron 11 seems to have helped. Density still looks good on LH probes, although maybe a bit low. Next shot will move upper x-point out by 1cm to increase density at top of grill a bit. 0.25V reduction in Vloop. Next shot will increase power to 100kW per klystron.

Jun 13 2007 10:27:18:380AM 1070613005 Greg Wallace 4 trips during LH pulse. Clear arcing in 23 bottom. Possibly something in 12 top on the forward signal. Next shot will turn down klystron 12 to 80kW.

Jun 13 2007 10:41:48:817AM 1070613006 Greg Wallace Waveguide 3 bottom arcing during first part of pulse. Arcing went away after tripout. Otherwise a great shot with .2-.3V reduction in Vloop. Next shot will increase klystron power to 115kW except tube 12 which will stay at 80kW, and try to decrease core density.

Jun 13 2007 10:50:37:533AM 1070613007 Greg Wallace Filiment fault shortened LH pulse. Next shot will keep klystron drive levels same but add a "dropout" at the end of the ramp. Line averaged density went down somewhat. ~0.4V of loop voltage reduction with 600kW of net power.

Jun 13 2007 11:12:16:597AM 1070613008 Greg Wallace Good current drive but some arcing problems on the bottom of waveguide 3. Next shot will turn down klystron 2 to 75kW but increase others to 130kW.

Jun 13 2007 11:29:09:003AM 1070613009 Greg Wallace Lower hybrid trips after initial ramp and did not turn back on. Arcing in waveguide 9 bottom. Next shot will try tweaking the phase on klystron 7 and turning klystron 5 down to 115kW.

Jun 13 2007 11:41:33:160AM 1070613010 Greg Wallace More arcing in waveguide 9 bottom. Will try starting the ramp from lower power and ramping more slowly on the next shot. Perhaps also some problems from waveguide 14.

Jun 13 2007 12:21:00:363PM 1070613011 Greg Wallace Looks like there might be an arc in waveguide 14. Next shot will turn down klystron 7 to 115kW.

Jun 13 2007 12:22:50:847PM 1070613012 Greg Wallace Sudden jump in channel 14 is the problem again. Next shot will try changing phasing on klystron 8 up by 15 degrees and turning power down on klystron 7 to 75kW.

Jun 13 2007 12:45:16:113PM 1070613013 Greg Wallace More arcing in waveguide 9 bottom. Seems to retry sucessfully, then arc in waveguide 14 between the jungle gym and the pant leg split.

Jun 13 2007 01:03:29:597PM 1070613014 Greg Wallace Trip again after ramp. Next shot will turn down arcing klystrons.

Jun 13 2007 01:02:55:533PM 1070613015 Greg Wallace More arcing in waveguide 3 during second part of pulse. First and third parts of pulse look good.

Jun 13 2007 01:21:09:253PM 1070613016 Greg Wallace Good shot! 600kW net power for almost the entire pulse. One trip right at the end of the pulse. Steady .4V reduction in Vloop. Will try to increase power for the next shot.

Jun 13 2007 01:55:05:130PM 1070613017 Greg Wallace Several good retries but kept tripping. Cell access to add an attenuator to waveguide 13 top and bottom.

Jun 13 2007 02:05:17:613PM 1070613018 Greg Wallace Pulse ran clean until filament fault shut off the HV. Next shot will increase power.

Jun 13 2007 02:27:57:800PM 1070613019 Greg Wallace Many trips, but no particular channel is clearly worse than others. Will retry same shot again.

Jun 13 2007 02:45:18:440PM 1070613020 Greg Wallace First half of pulse looked good, then tripped due to arcing in waveguide 14? Next shot will be 60 degree phasing.

Jun 13 2007 02:49:48:143PM 1070613021 Greg Wallace 60 degree phasing. Early trip and many retries but nothing stuck. Problem seems to be with 23Top. Will try changing phase on klystron 12.

Jun 13 2007 03:06:21:003PM 1070613022 Greg Wallace More trips. Cell access to de-sensitize reflected signals on 23 Top. Next shot will repeat.

Jun 13 2007 03:51:18:770PM 1070613023 Greg Wallace Tripped and did not come back on after ramp. Cell access to add some more attenuators on waveguides 9 and 23.

Jun 13 2007 04:08:02:160PM 1070613024 Greg Wallace More trips. One more try to increase power by turning down klystron 5 to 80kW.

Jun 13 2007 04:12:53:550PM 1070613025 Greg Wallace More trips again. Changing phase shifters to 0 degrees and running 120 degree approximate phasing to simulate 60 degree phasing. Will run first half in co current, second half counter current.

Jun 13 2007 04:39:01:427PM 1070613026 Greg Wallace Early disruption.

Jun 13 2007 04:57:35:847PM 1070613027 Greg Wallace Trip on 6T seems to be the problem. Next shot will increase power from klystron 3 to avoid trips.

Jun 13 2007 05:04:52:347PM 1070613028 Greg Wallace 6T high reflection still the problem. Last shot of the day.

Physics Operator Comments

Jun 12 2007 04:10:34:280PM Robert Granetz DPCS loaded from shot 1070606003. (seg1 and 2 active). Segment 1 then imported
from 1070612025. Change pre-fill puff to 18 ms. Save as shot 1070613000 in
/home/granetz/pcs_scratch

Jun 13 2007 08:55:23:053AM Robert Granetz Loaded shot 1070613000 from /home/granetz/pcs_scratch. 0.8 MA, 5.4 T, 0.7e20 m-2, LSN.
Decreased nl_04 to 0.5e20 m-2.

Jun 13 2007 09:15:41:147AM 1070613001 Robert Granetz Shot 01 -- Plasma. Good shot. Very small outer gap, as desired. EFIT claims that it's
marginally limited during latter part of flattop. 0.8 MA, 5.4 T, nl_04=0.54e19

Next shot: no DPCS changes

Jun 13 2007 09:26:22:430AM 1070613002 Robert Granetz Shot 02 -- Plasma. Good shot. LH is still faulting alot.

Next shot: no DPCS changes

Jun 13 2007 09:47:49:440AM 1070613003 Robert Granetz Shot 03 -- Plasma. Good shot. Still have hard x-rays early in the shot, but the startup looks
good.

Next shot: add 2 ms to pre-fill.

Jun 13 2007 10:04:35:017AM 1070613004 Robert Granetz Shot 04 -- Plasma. Good shot. Nice LH waveform...400 kW, steady 0.5 s.

Next shot: Move upper x-point out by 1 cm to increase density near upper
part of LH grill.

Jun 13 2007 10:23:29:270AM 1070613005 Robert Granetz Shot 05 -- Plasma. Good shot. PLH=550 kW, 0.5 s. DNB continues to run well too.
Greg says that density at upper part of grill was higher, as desired.

Next shot: no DPCS changes.

Jun 13 2007 10:39:46:487AM 1070613006 Robert Granetz Shot 06 -- Plasma. Good shot. PLH=500-550 kW for 0.5 s.

Next shot: decrease nl_04 to 0.35e20 m-2 after t=0.5 s.

Jun 13 2007 10:55:01:223AM 1070613007 Robert Granetz Shot 07 -- Plasma. Good shot. Density did come down a bit after t=0.5 s.
PLH = 600 kW, for 0.2 s. Loop voltage dropped even more (0.4 volts,
compared to 0.3 volts on previous shots).

Next shot: no DPCS changes

Jun 13 2007 11:02:11:737AM 1070613008 Robert Granetz Shot 08 -- Plasma. Good shot. P_LH = 600 kW, 0.5 s. Lots more hard x-rays during
the LH pulse and afterward.

Next shot: no DPCS changes

Jun 13 2007 11:19:35:597AM 1070613009 Robert Granetz Shot 09 -- Plasma. Good shot. LH faulted alot.

Next shot: no DPCS changes.

Jun 13 2007 11:37:11:393AM 1070613010 Robert Granetz Shot 10 -- Plasma. Good shot. LH faults alot.

Next shot: no DPCS changes

Jun 13 2007 11:54:30:410AM 1070613011 Robert Granetz Shot 11 -- Plasma. Good shot. Current is dipping aaround 0.3 s.

Next shot: no DPCS changes

Jun 13 2007 12:12:52:660PM 1070613012 Robert Granetz Shot 12 -- Plasma. Good shot. Still having some LH problems.

Next shot: no DPCS changes

Jun 13 2007 12:28:57:910PM 1070613013 Robert Granetz Shot 13 -- Plasma. Good shot. Plasma current is taking a big dip around t=0.2 s. LH is still
tripping alot.

Next shot: no DPCS changes

Jun 13 2007 12:46:22:190PM 1070613014 Robert Granetz Shot 14 -- Plasma. Good shot. LH still having problems.

Next shot: no DPCS changes

Jun 13 2007 01:05:09:880PM 1070613015 Robert Granetz Shot 15 -- Plasma. Good shot. Good LH. 600 kW for 0.3 s. Droop in plasma current
during the rampup has nearly disappeared, even though I haven't done
anything about it.

Next shot: no DPCS changes

Jun 13 2007 01:20:16:130PM 1070613016 Robert Granetz Shot 16 -- Plasma. Good shot. Very good LH pulse; 600 kW for 0.4 s.

Next shot: no DPCS changes

Jun 13 2007 01:46:56:533PM 1070613017 Robert Granetz Shot 17 -- Plasma. Good shot. LH faulted alot.

Cell access for LH and for MSE after this shot.

Next shot: no DPCS changes

Jun 13 2007 02:22:26:080PM 1070613018 Robert Granetz Shot 18 -- Plasma. Good shot. The dip in the current during the rampup came back,
for no obvious reason. LH power was 650-700 kW, but for only 100 ms.

Next shot: no DPCS changes

Jun 13 2007 02:23:44:533PM 1070613019 Robert Granetz Shot 19 -- Plasma. Good shot. LH faulted alot. The dip in the current during the rampup
disappeared, again for no obvious reason.

Next shot: no DPCS changes

Jun 13 2007 02:42:08:283PM 1070613020 Robert Granetz Shot 20 -- Plasma. Good shot. P_LH >= 700 kW for 0.2 s.

Next shot: no DPCS changes

Jun 13 2007 02:47:30:770PM 1070613021 Robert Granetz Shot 21 -- Plasma. Good shot. LH faulted alot.

Next shot: no DPCS changes

Jun 13 2007 03:05:58:067PM 1070613022 Robert Granetz Shot 22 -- Plasma. Good shot. LH faulted alot.

Cell access for LH and MSE after this shot.

Next shot: no DPCS changes

Jun 13 2007 03:40:18:610PM 1070613023 Robert Granetz Shot 23 -- Plasma. Good shot. Early dip in Ip is back. LH climbed to 750 kW but then faulted.

Next shot: no DPCS changes

Jun 13 2007 03:42:12:113PM 1070613023 Robert Granetz The init cycle hung, resulting in a few minutes of delay before shot 23 was
successfully executed.

Jun 13 2007 03:43:01:160PM 1070613023 Robert Granetz A cell access for LH occurred after this shot.

Jun 13 2007 04:00:32:770PM 1070613024 Robert Granetz Shot 24 -- Plasma. Good shot. LH faulted alot.

Next shot: no DPCS changes

Jun 13 2007 04:12:07:177PM 1070613025 Robert Granetz Shot 25 -- Plasma. Good shot. LH faulted alot.

Another cell access for LH occurred after this shot.

Next shot: no DPCS changes

Jun 13 2007 04:42:01:487PM 1070613026 Robert Granetz Shot 26 -- Plasma. Disrupted very early. Looks like it just got very resistive.

Next shot: reduce pre-fill by 2 ms (disruption recovery).

Jun 13 2007 04:58:49:207PM 1070613027 Robert Granetz Shot 27 -- Plasma. Good shot. LH faulted alot.

Next shot: no DPCS changes. Lithium pellet injector will fire after t=1.3 s.

Jun 13 2007 05:06:19:800PM 1070613028 Robert Granetz Shot 28 -- Plasma. Good shot. Lithium pellet disrupted plasma at t=1.36 s.
LH faulted alot.

End of run

Engineering Operator Comments

Shot Time Type Status Comment

1 09:06:36:647AM Plasma Ok

2 09:22:24:757AM Plasma Ok

3 09:38:41:677AM Plasma Ok

4 09:52:56:253AM Plasma Ok

5 10:09:13:080AM Plasma Ok

6 10:27:48:190AM Plasma Ok

7 10:41:12:473AM Plasma Ok

8 10:56:26:910AM Plasma Ok

9 11:14:51:130AM Plasma Ok

10 11:30:20:927AM Plasma Ok

11 11:45:30:830AM Plasma Ok

12 12:05:08:783PM Plasma Ok

13 12:22:34:770PM Plasma Ok

14 12:40:54:300PM Plasma Ok

15 12:59:13:550PM Plasma Ok

16 01:14:32:113PM Plasma Ok

17 01:27:07:270PM Plasma Ok

18 02:01:43:927PM Plasma Ok

19 02:17:12:300PM Plasma Ok

20 02:30:35:643PM Plasma Ok

21 02:43:03:050PM Plasma Ok

22 02:55:37:363PM Plasma Ok

23 03:31:38:020PM Plasma Ok

24 03:55:15:957PM Plasma Ok

25 04:07:53:050PM Plasma Ok

26 04:36:40:237PM Plasma Ok

27 04:49:01:610PM Plasma Ok

28 05:01:38:487PM Plasma Ok

System Availability

Jun 13 2007 09:06:12:270AM

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. May 01 2007 12:31PM (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 yes All channels now working. Apr 04 2007 11:04AM (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. ready Mar 28 2007 08:50AM (ylin) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna no 80 MHz. FFT installation/coaxial line needs more work Mar 16 2007 09:32AM (ylin) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna yes 78 MHz Apr 04 2007 08:56AM (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 The 60, 110, 88LSB, 88USB and 88 are connected but still being tested. The Swept frequency channel is running DC voltages from 5V-7V, also in the testing stage. Jun 01 2007 09:11AM (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 -125mm (standard). Density is calibrated according to Raman scattering results from 26 May, supplemented with ECE cutoffs obtained on shot 1070531015. Jun 13 2007 08:56AM (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 13 2007 09:20:37:820AM	1070613001	Greg Wallace	LH trips out on all segments. Problem appears to be 21T. Edge density reading 2-3e19 looks good. nl04 of 5e19.
Jun 13 2007 09:30:17:350AM	1070613002	Greg Wallace	More trips. Cart 1&2 did not fire due to fault from previous shot not being cleared. Next shot will change phase on klystron 11 by -10 degrees.
Jun 13 2007 09:42:07:507AM	1070613003	Greg Wallace	Reflections on 21T worse than before. Moving phase in this direction did not work. Will try increasing phase on klystron 11 by 15 degrees compared to "normal" on the next shot.
Jun 13 2007 10:05:04:127AM	1070613004	Greg Wallace	Good shot! LH ran full length with no trips. +15 degrees on klystron 11 seems to have helped. Density still looks good on LH probes, although maybe a bit low. Next shot will move upper x-point out by 1cm to increase density at top of grill a bit. 0.25V reduction in Vloop. Next shot will increase power to 100kW per klystron.
Jun 13 2007 10:27:18:380AM	1070613005	Greg Wallace	4 trips during LH pulse. Clear arcing in 23 bottom. Possibly something in 12 top on the forward signal. Next shot will turn down klystron 12 to 80kW.
Jun 13 2007 10:41:48:817AM	1070613006	Greg Wallace	Waveguide 3 bottom arcing during first part of pulse. Arcing went away after tripout. Otherwise a great shot with .2-.3V reduction in Vloop. Next shot will increase klystron power to 115kW except tube 12 which will stay at 80kW, and try to decrease core density.
Jun 13 2007 10:50:37:533AM	1070613007	Greg Wallace	Filiment fault shortened LH pulse. Next shot will keep klystron drive levels same but add a "dropout" at the end of the ramp. Line averaged density went down somewhat. ~0.4V of loop voltage reduction with 600kW of net power.
Jun 13 2007 11:12:16:597AM	1070613008	Greg Wallace	Good current drive but some arcing problems on the bottom of waveguide 3. Next shot will turn down klystron 2 to 75kW but increase others to 130kW.
Jun 13 2007 11:29:09:003AM	1070613009	Greg Wallace	Lower hybrid trips after initial ramp and did not turn back on. Arcing in waveguide 9 bottom. Next shot will try tweaking the phase on klystron 7 and turning klystron 5 down to 115kW.
Jun 13 2007 11:41:33:160AM	1070613010	Greg Wallace	More arcing in waveguide 9 bottom. Will try starting the ramp from lower power and ramping more slowly on the next shot. Perhaps also some problems from waveguide 14.
Jun 13 2007 12:21:00:363PM	1070613011	Greg Wallace	Looks like there might be an arc in waveguide 14. Next shot will turn down klystron 7 to 115kW.
Jun 13 2007 12:22:50:847PM	1070613012	Greg Wallace	Sudden jump in channel 14 is the problem again. Next shot will try changing phasing on klystron 8 up by 15 degrees and turning power down on klystron 7 to 75kW.
Jun 13 2007 12:45:16:113PM	1070613013	Greg Wallace	More arcing in waveguide 9 bottom. Seems to retry sucessfully, then arc in waveguide 14 between the jungle gym and the pant leg split.
Jun 13 2007 01:03:29:597PM	1070613014	Greg Wallace	Trip again after ramp. Next shot will turn down arcing klystrons.
Jun 13 2007 01:02:55:533PM	1070613015	Greg Wallace	More arcing in waveguide 3 during second part of pulse. First and third parts of pulse look good.
Jun 13 2007 01:21:09:253PM	1070613016	Greg Wallace	Good shot! 600kW net power for almost the entire pulse. One trip right at the end of the pulse. Steady .4V reduction in Vloop. Will try to increase power for the next shot.
Jun 13 2007 01:55:05:130PM	1070613017	Greg Wallace	Several good retries but kept tripping. Cell access to add an attenuator to waveguide 13 top and bottom.
Jun 13 2007 02:05:17:613PM	1070613018	Greg Wallace	Pulse ran clean until filament fault shut off the HV. Next shot will increase power.
Jun 13 2007 02:27:57:800PM	1070613019	Greg Wallace	Many trips, but no particular channel is clearly worse than others. Will retry same shot again.
Jun 13 2007 02:45:18:440PM	1070613020	Greg Wallace	First half of pulse looked good, then tripped due to arcing in waveguide 14? Next shot will be 60 degree phasing.
Jun 13 2007 02:49:48:143PM	1070613021	Greg Wallace	60 degree phasing. Early trip and many retries but nothing stuck. Problem seems to be with 23Top. Will try changing phase on klystron 12.
Jun 13 2007 03:06:21:003PM	1070613022	Greg Wallace	More trips. Cell access to de-sensitize reflected signals on 23 Top. Next shot will repeat.
Jun 13 2007 03:51:18:770PM	1070613023	Greg Wallace	Tripped and did not come back on after ramp. Cell access to add some more attenuators on waveguides 9 and 23.
Jun 13 2007 04:08:02:160PM	1070613024	Greg Wallace	More trips. One more try to increase power by turning down klystron 5 to 80kW.
Jun 13 2007 04:12:53:550PM	1070613025	Greg Wallace	More trips again. Changing phase shifters to 0 degrees and running 120 degree approximate phasing to simulate 60 degree phasing. Will run first half in co current, second half counter current.
Jun 13 2007 04:39:01:427PM	1070613026	Greg Wallace	Early disruption.
Jun 13 2007 04:57:35:847PM	1070613027	Greg Wallace	Trip on 6T seems to be the problem. Next shot will increase power from klystron 3 to avoid trips.
Jun 13 2007 05:04:52:347PM	1070613028	Greg Wallace	6T high reflection still the problem. Last shot of the day.

Physics Operator Comments
Jun 12 2007 04:10:34:280PM		Robert Granetz	DPCS loaded from shot 1070606003. (seg1 and 2 active). Segment 1 then imported from 1070612025. Change pre-fill puff to 18 ms. Save as shot 1070613000 in /home/granetz/pcs_scratch
Jun 13 2007 08:55:23:053AM		Robert Granetz	Loaded shot 1070613000 from /home/granetz/pcs_scratch. 0.8 MA, 5.4 T, 0.7e20 m-2, LSN. Decreased nl_04 to 0.5e20 m-2.
Jun 13 2007 09:15:41:147AM	1070613001	Robert Granetz	Shot 01 -- Plasma. Good shot. Very small outer gap, as desired. EFIT claims that it's marginally limited during latter part of flattop. 0.8 MA, 5.4 T, nl_04=0.54e19 Next shot: no DPCS changes
Jun 13 2007 09:26:22:430AM	1070613002	Robert Granetz	Shot 02 -- Plasma. Good shot. LH is still faulting alot. Next shot: no DPCS changes
Jun 13 2007 09:47:49:440AM	1070613003	Robert Granetz	Shot 03 -- Plasma. Good shot. Still have hard x-rays early in the shot, but the startup looks good. Next shot: add 2 ms to pre-fill.
Jun 13 2007 10:04:35:017AM	1070613004	Robert Granetz	Shot 04 -- Plasma. Good shot. Nice LH waveform...400 kW, steady 0.5 s. Next shot: Move upper x-point out by 1 cm to increase density near upper part of LH grill.
Jun 13 2007 10:23:29:270AM	1070613005	Robert Granetz	Shot 05 -- Plasma. Good shot. PLH=550 kW, 0.5 s. DNB continues to run well too. Greg says that density at upper part of grill was higher, as desired. Next shot: no DPCS changes.
Jun 13 2007 10:39:46:487AM	1070613006	Robert Granetz	Shot 06 -- Plasma. Good shot. PLH=500-550 kW for 0.5 s. Next shot: decrease nl_04 to 0.35e20 m-2 after t=0.5 s.
Jun 13 2007 10:55:01:223AM	1070613007	Robert Granetz	Shot 07 -- Plasma. Good shot. Density did come down a bit after t=0.5 s. PLH = 600 kW, for 0.2 s. Loop voltage dropped even more (0.4 volts, compared to 0.3 volts on previous shots). Next shot: no DPCS changes
Jun 13 2007 11:02:11:737AM	1070613008	Robert Granetz	Shot 08 -- Plasma. Good shot. P_LH = 600 kW, 0.5 s. Lots more hard x-rays during the LH pulse and afterward. Next shot: no DPCS changes
Jun 13 2007 11:19:35:597AM	1070613009	Robert Granetz	Shot 09 -- Plasma. Good shot. LH faulted alot. Next shot: no DPCS changes.
Jun 13 2007 11:37:11:393AM	1070613010	Robert Granetz	Shot 10 -- Plasma. Good shot. LH faults alot. Next shot: no DPCS changes
Jun 13 2007 11:54:30:410AM	1070613011	Robert Granetz	Shot 11 -- Plasma. Good shot. Current is dipping aaround 0.3 s. Next shot: no DPCS changes
Jun 13 2007 12:12:52:660PM	1070613012	Robert Granetz	Shot 12 -- Plasma. Good shot. Still having some LH problems. Next shot: no DPCS changes
Jun 13 2007 12:28:57:910PM	1070613013	Robert Granetz	Shot 13 -- Plasma. Good shot. Plasma current is taking a big dip around t=0.2 s. LH is still tripping alot. Next shot: no DPCS changes
Jun 13 2007 12:46:22:190PM	1070613014	Robert Granetz	Shot 14 -- Plasma. Good shot. LH still having problems. Next shot: no DPCS changes
Jun 13 2007 01:05:09:880PM	1070613015	Robert Granetz	Shot 15 -- Plasma. Good shot. Good LH. 600 kW for 0.3 s. Droop in plasma current during the rampup has nearly disappeared, even though I haven't done anything about it. Next shot: no DPCS changes
Jun 13 2007 01:20:16:130PM	1070613016	Robert Granetz	Shot 16 -- Plasma. Good shot. Very good LH pulse; 600 kW for 0.4 s. Next shot: no DPCS changes
Jun 13 2007 01:46:56:533PM	1070613017	Robert Granetz	Shot 17 -- Plasma. Good shot. LH faulted alot. Cell access for LH and for MSE after this shot. Next shot: no DPCS changes
Jun 13 2007 02:22:26:080PM	1070613018	Robert Granetz	Shot 18 -- Plasma. Good shot. The dip in the current during the rampup came back, for no obvious reason. LH power was 650-700 kW, but for only 100 ms. Next shot: no DPCS changes
Jun 13 2007 02:23:44:533PM	1070613019	Robert Granetz	Shot 19 -- Plasma. Good shot. LH faulted alot. The dip in the current during the rampup disappeared, again for no obvious reason. Next shot: no DPCS changes
Jun 13 2007 02:42:08:283PM	1070613020	Robert Granetz	Shot 20 -- Plasma. Good shot. P_LH >= 700 kW for 0.2 s. Next shot: no DPCS changes
Jun 13 2007 02:47:30:770PM	1070613021	Robert Granetz	Shot 21 -- Plasma. Good shot. LH faulted alot. Next shot: no DPCS changes
Jun 13 2007 03:05:58:067PM	1070613022	Robert Granetz	Shot 22 -- Plasma. Good shot. LH faulted alot. Cell access for LH and MSE after this shot. Next shot: no DPCS changes
Jun 13 2007 03:40:18:610PM	1070613023	Robert Granetz	Shot 23 -- Plasma. Good shot. Early dip in Ip is back. LH climbed to 750 kW but then faulted. Next shot: no DPCS changes
Jun 13 2007 03:42:12:113PM	1070613023	Robert Granetz	The init cycle hung, resulting in a few minutes of delay before shot 23 was successfully executed.
Jun 13 2007 03:43:01:160PM	1070613023	Robert Granetz	A cell access for LH occurred after this shot.
Jun 13 2007 04:00:32:770PM	1070613024	Robert Granetz	Shot 24 -- Plasma. Good shot. LH faulted alot. Next shot: no DPCS changes
Jun 13 2007 04:12:07:177PM	1070613025	Robert Granetz	Shot 25 -- Plasma. Good shot. LH faulted alot. Another cell access for LH occurred after this shot. Next shot: no DPCS changes
Jun 13 2007 04:42:01:487PM	1070613026	Robert Granetz	Shot 26 -- Plasma. Disrupted very early. Looks like it just got very resistive. Next shot: reduce pre-fill by 2 ms (disruption recovery).
Jun 13 2007 04:58:49:207PM	1070613027	Robert Granetz	Shot 27 -- Plasma. Good shot. LH faulted alot. Next shot: no DPCS changes. Lithium pellet injector will fire after t=1.3 s.
Jun 13 2007 05:06:19:800PM	1070613028	Robert Granetz	Shot 28 -- Plasma. Good shot. Lithium pellet disrupted plasma at t=1.36 s. LH faulted alot. End of run

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:06:36:647AM	Plasma	Ok
2	09:22:24:757AM	Plasma	Ok
3	09:38:41:677AM	Plasma	Ok
4	09:52:56:253AM	Plasma	Ok
5	10:09:13:080AM	Plasma	Ok
6	10:27:48:190AM	Plasma	Ok
7	10:41:12:473AM	Plasma	Ok
8	10:56:26:910AM	Plasma	Ok
9	11:14:51:130AM	Plasma	Ok
10	11:30:20:927AM	Plasma	Ok
11	11:45:30:830AM	Plasma	Ok
12	12:05:08:783PM	Plasma	Ok
13	12:22:34:770PM	Plasma	Ok
14	12:40:54:300PM	Plasma	Ok
15	12:59:13:550PM	Plasma	Ok
16	01:14:32:113PM	Plasma	Ok
17	01:27:07:270PM	Plasma	Ok
18	02:01:43:927PM	Plasma	Ok
19	02:17:12:300PM	Plasma	Ok
20	02:30:35:643PM	Plasma	Ok
21	02:43:03:050PM	Plasma	Ok
22	02:55:37:363PM	Plasma	Ok
23	03:31:38:020PM	Plasma	Ok
24	03:55:15:957PM	Plasma	Ok
25	04:07:53:050PM	Plasma	Ok
26	04:36:40:237PM	Plasma	Ok
27	04:49:01:610PM	Plasma	Ok
28	05:01:38:487PM	Plasma	Ok