Alcator C-Mod Run 1080331 Information

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Miniproposals

Operators
Session leader(s):
Physics operator(s):Jim Irby
Engineering operator(s):

Engineering Operator Run Comment
Shot Cycles for Cryopump Tests

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Physics Operator Summaries
Entered: Apr 1 2008 08:10:26:430AM
Author: Jim Irby
There is a good chance that the bursts of m28, 14, 18, and 20 are related to temperature gradient induced stresses in the cryopump rather than leaks. Brian tried various things today including standand cooldowns during repeated shot cycles, purging a cold pump with helium gas, pressuring a warm pump with helium up to 6 psi, and pumping a warm pump down. The initial cooldown and helium purges of a cold pump were the only tests that resulted in detectable signals on the RGA. A slow purge of a cold pump resulted in a less peaked but extended period of RGA activity. At no time today did we see changes in m32 or m40. At no time today did we see just changes in m14 and 28.

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Later in the Day Brian was able to confirm a leak in the LN2 feedline. It showed an change in m28 from 3 to 6e-8 Torr as the line was pressured to 30 psi with LN2. There was also a delayed increase in m18 and m20 as the the m28 came up.

Session Leader Comments

Physics Operator Comments
Mar 31 2008 03:05:13:633PM1080331001Jim IrbyWe will run a set of cycle tests to check out the cryopump.

This shot will check data system as the cryopump cools down.

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Data system issues --- dpcs...
Mar 31 2008 04:08:07:057PM1080331003Jim IrbyData system looks okay
Brian has done tests indicating cryopump is working normally.

We still have a burst of mass 28 to about 6e-8 Torr on the RGA during cooldown of the cryopump.

Basepressue down to 6.6e-8 Torr.



Mar 31 2008 04:37:11:963PM1080331005Jim IrbyFinally puffed some gas


Mar 31 2008 04:56:24:307PM1080331006Jim IrbyBrian suspects that we do not have a leak in the cryopump, but that it warms up enough (from intially warm gas) when he starts the cooldown to liberate some of the gas that was pumped.

prefill from -0.6 to -0.5 s. Clearly more gas injected





Mar 31 2008 04:59:07:870PM1080331008Jim Irbyprefill unchanged


Engineering Operator Comments
ShotTimeTypeStatusComment
102:57:50:027PMPlasmaOk
303:57:43:450PMTestOk
504:23:19:493PMTestOk
604:43:01:667PMTestOk
704:54:26:650PMTestOk

System Availability
Mar 31 2008 02:57:42:183PM
SystemAvailableCommentAvailability
Changed
OwnerDescriptionWho Can
Change
Active MHDyesFully operationalMar 28 2007 09:19PM (sears)Joe SnipesActive MHD Antennasears,snipes
BESyesvertical 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 BravenecBeam Emission Spectroscopybravenec,rowan
BolometersyesDiode 2pi working fine, foil 2pi being low-pass filtered to remove noise. Outboard miidplane AXUV has a grounded channel which is disrupting the whole array OFFLINE for now. Midplane foils working fine, but need to fill tree with calibrations. 2D AXUV arrays are being digitized but need further debugging and calibration.Mar 14 2008 11:09AM (mlreinke)Matt ReinkeBolometershutch,mlreinke
BoronizationnoFirst Boronization 5/9/07 Bottle has been removed from the cellSep 14 2007 12:42PM (dekow)Jim IrbyBoronizationdekow,irby
CNPAyesSingle channel CNPA available as of 12/1707Dec 17 2007 05:48PM (parker)Ron ParkerCompact Neutral Analyzerparker
Cryopump - Upper DivertoryesCryopump is operationalDec 11 2007 10:13AM (labombard)Brian LaBombardUpper Divertor Cryopumpirby,labombard
CXRSyesThe 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 RowanCharge Exchange Spectroscopybespam,blip,rachmcd,rowan
D Alphayes\ha2_bright and \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 are availableNov 26 2007 04:23PM (terry)Jim TerryBalmer Alpha Monitorirby,terry,wolfe
Dalsayesoptics repaired, camera re-installed, and view has been re-calibratedNov 27 2007 09:54AM (marmar)Earl MarmarVisible Bremsstrahlungmarmar
Disruption Mitigationno Nov 20 2007 10:47PM (granetz)Robert GranetzGas Jetgranetz,whyte
Divertor IRno Mar 06 2007 10:50AM Glen WurdenDivertor IR Digital Videogwurden,terry
Divertor IR Spectroscopyno Mar 06 2007 10:51AM Glen WurdenDivertor IR Spectroscopygwurden,terry
DNBno Nov 20 2007 10:47PM (granetz)Robert GranetzDiagnostic Neutral Beambeals,granetz
FRC-ECEyes16 Channels now working - low freq. side - outer RmidsFeb 19 2008 09:56AM (phillips)Perry PhillipsHeterodyne ECE-32 channelsphillips
G-Side RatiomaticyesGauge is operational and calibrated against G-side MKS on shot#1071127002Nov 27 2007 01:25PM (labombard)Brian LaBombardG-side ratiomatic ionization gaugelabombard,toland
GPCyesAll 9 channels operational as of new year.Jan 03 2008 09:31AM (hubbard)Amanda HubbardECE Polychromaterhubbard,schmidt
GPC2yesMost channels operational.Jan 02 2008 12:22PM (hubbard)Amanda HubbardECE Polychromaterhubbard,schmidt
GPInoNeither the Xpt-view nor the midplane-view camera is operational. Nov 26 2007 04:25PM (terry)Jim TerryGas Puff Imagingterry,zweben
H/DyesShould be operational for the FY08 campaignNov 27 2007 09:54AM (marmar)Earl MarmarH/D Ratiomarmar
Hirex Jryes Mar 06 2007 08:59AM (rice)John RiceHigh Resolution X-Rayince,rice
Hirex SrnoBe Window has a leak and so the gate valve is closedNov 23 2007 12:50PM (ince)John RiceHigh Resolution X-Rayince,rice
HXRyesSomething might be wrong with channel 26; all others working fine.Mar 23 2007 10:43AM (schmidt)Ron ParkerHard X-Ray Arrayparker,schmidt
ICRF D-Antennayesavailable (quarter-wave transformer for pre-matching)Dec 11 2007 09:01AM (ylin)Steve WukitchD-port antennawukitch,ylin
ICRF E-Antennayesavailable (with FFT for automatical matching)Dec 11 2007 09:01AM (ylin)Steve WukitchE-port antennawukitch,ylin
ICRF J-Antennayesnormally in [0,pi,pi,0] phase for heating. current drive phase available if requested.Dec 11 2007 09:03AM (ylin)Steve WukitchJ-port antennawukitch,ylin
Lower HybridyesBody I Fault Circuits Repaired and tested. High power tests completedDec 05 2007 06:40PM (dterry)Ron ParkerLower Hybriddterry,parker
LPIyes1/9/08Jan 09 2008 03:23PM (bose)Earl MarmarLithium Pellet Injectorbose,marmar
Ly-alphayesMidplane 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 ReinkeLyman alpha cameraslabombard,mlreinke
McPhersonnoProblems with detector. No quantitative line brightnesses possible. Qualitative tasks like impurity identification possible.Feb 15 2008 02:07PM (mlreinke)Jim TerryVUV Spectrometermlreinke,terry
MichelsonyesWorking, moderate speed for now.Jan 02 2008 01:19PM (hubbard)Amanda HubbardECE Te Profileshubbard,schmidt
MKSyesE-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 LaBombardBaratron pressure gaugeslabombard
MLPnoInitial 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 LaBombardMirror Langmuir Probe Electronics Systemlabombard
MSEnoWe are basically awaiting the DNB & its new aperture. MSE itself is OK.Feb 21 2008 08:51AM (jinseok)Steve ScottMotional Stark Effectjinseok,sscott
NeutronsyesVoltage 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 FioreNeutron Detectorsfiore
Neuts and Hardsyescalibration unchanged from 2007 campaignDec 04 2007 08:56PM (irby)Jim IrbyX-Ray/Neutron Detector at K-Horirby
NINJAyesAll capillaries displayed by the NINJA_CONTROL GUI have been tested. Nov 26 2007 04:26PM (terry)Brian LaBombardNINJA gas pufflabombard,terry
PCIyesworkingFeb 29 2008 07:00PM (lianglin)Miklos PorkolabPhase Contrast Imagingedlund,lianglin,ntsujii,porkolab
Penning GaugesyesAll gauges except B_DivL are operatingNov 27 2007 01:31PM (labombard)Brian LaBombardPenning Ionization Gaugeslabombard
Plasma TVyesWIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational.Nov 26 2007 04:27PM (terry)Jim TerryVideo of plasma via several camerasdekow,irby,terry,wolfe
PolarimeternoSafe for Machine EntrySep 14 2007 12:17PM (irby)Jim IrbyC-Mod Polarimeterirby
Probe Array - ISDyesOperationalNov 27 2007 01:40PM (labombard)Brian LabombardInner Lower Divertor Probe Arraylabombard
Probe Array - LHyesOperationalNov 27 2007 01:40PM (labombard)Brian LaBombardLower Hybrid Probe Arraylabombard
Probe Array - OSDyesOperationalNov 27 2007 01:41PM (labombard)Brian LaBombardOuter Lower Divertor Probe Arraylabombard
Probe Array - UDIVyesOperationalNov 27 2007 01:41PM (labombard)Brian LaBombardUpper Divertor Probe Arraylabombard
ReflectometeryesSystem is connected....there have been problems with getting data on the week of 3/18-3/20, but the system seems to be OK for 3/21. channels 50,60,88 and 110 are connected.Mar 21 2008 08:12AM (dominguez)Earl MarmarReflectometerdominguez,marmar
Scanning Probe - ASPyesOperational, but needs to be checked with plasma.Nov 27 2007 01:45PM (labombard)Brian LaBombardA-Port Scanning Probelabombard
Scanning Probe - FSPyesFSP is operationalDec 11 2007 10:13AM (labombard)Brian LaBombardF-Port Scanning Probelabombard
Scanning Probe - WASPyesA- and K-port WASP electrodes have been replaced/tested.Nov 27 2007 01:44PM (labombard)Brian LaBombardInner Wall Scanning Probelabombard,nsmick
TCIyesCO2 Laser is on --- initial alignment completeNov 16 2007 01:23PM (irby)Jim IrbyTwo-Color Interferometerirby,murray
TS - Coreyes12 polychromators (#1~8,9,11,13,15), 1 laser. Density is calibrated for YAG1 based on ECE cutoff data taken on Mar11. YAG2 is offline. Mar 14 2008 09:59AM (jwhughes)Jerry HughesCore Thomson scatteringjwhughes,yma
TS - EdgeyesSystem is working with 3 out of 4 spectral channels and should be believable for Te>50eV, ne>3e19. Density is calibrated from both Raman scattering in D2 (3/2/08) and from edge ECE cutoffs in high-density H-modes (1080228014).Mar 17 2008 10:26AM (jwhughes)Jerry HughesMillimeter resolution edge Thomson scatteringjwhughes,yma
Vispecno350 and 670 nm, 4 spatial channelsNov 28 2007 09:58AM (agraf)Alex GrafVisible Spectrometeragraf
XTOMOyessystem operational, but channels have been dying...stay tuned.Mar 14 2008 11:10AM (mlreinke)Bob GranetzX-Ray Tomographygranetz,mlreinke