New MPTS Analysis for 2008

B.P. LeBlanc

PPPL

22-DEC-2008

MPTS Run for 2008

• Polarizer in place for the first time– Reduces background radiation, but saturation

remains a problem

• First run with in-situ window calibration– Window coating observed and measured

• Two laser shutdowns– Measures now in place to improve reliability

• Phase-3 calibration done after the run• New analysis performed

New MPTS Analysis for 2008

• Phase-3 channel calibration for 2008– Change Te @R=54.5cm

• Software modification to add extra time points under background light saturation

• In-situ window calibration– Increase ne about 10% at end or run– Increase Te within error bar

• Valid array (ntime, nrad)– Valid>0 means ok

Phase-3 2008 CalibrationMain change seen at R=54.5cm

Background Light SaturationSignal hits digitalization maximum

Software Modification for Saturation Condition

What Happened after 0.6s?Neutron signal consistent with Te drop

Output Array VALID (ntime,nrad)Has same dimensions as Tef, etc.

• VALID=1 ok

• VALID=2 ok with background sat

• VALID=3 ok,but with bckgd-sat “repair”

• VALID=-1 too high

• VALID=-2 too high with bckgd sat

• VALID=-4 ok, but dTe > Te

Effects of in-situ Window CalibrationLast run day shot 130730 @0.49s

Valid

Te increase within error bar

ne increase about about 10%

Window Coating Correction and Saturation Remedial

Effects of in-situ Window CalibrationLast run day shot 130730 @1.22s

Valid

Effects of in-situ Window CalibrationLast run day shot 130730 around 1.2s

ValidNew time point

Valid Array is Part of MPTS Outputts function has been modified

IDL> help,ts(130730),/str"Best" analysis is of "Preliminary" quality ** Structure <93cdd7c>, 20 tags, length=131644, data length=131642, refs=1: SHOT LONG 130730 TIME FLOAT Array[31] RADIUS FLOAT Array[30] DR FLOAT Array[30] TEF DOUBLE Array[31, 30] NEF DOUBLE Array[31, 30] PEF DOUBLE Array[31, 30] DTEF DOUBLE Array[31, 30] DNEF DOUBLE Array[31, 30] DPEF DOUBLE Array[31, 30] RS FLOAT Array[101] TES DOUBLE Array[31, 101] NES DOUBLE Array[31, 101] PES DOUBLE Array[31, 101] LD DOUBLE Array[31] LASER INT Array[37] RR DOUBLE Array[37, 30] VALID INT Array[31, 30] DATE_AN STRING 'Mon Jul 14 16:17:37 2008' COMMENT STRING 'ldc=11 ldr=11 sph=1 002x geom:[Ishelf[0:15'...IDL>

Valid_viewer Application (1)

Phase 1

Phase 2

Phase 3

Valid_viewer Application (2)

Phase 1

Phase 2

Phase 3

Valid_viewer Application (3)

Phase 1

Phase 2

Phase 3

Concluding Remarks

• New analysis will be loaded to MDS soon– During the Holidays

• Valid array– Valid > 0 indicates ok, – but caveat emptor when valid=3

• Window coating effects were corrected based on the in-situ calibration– Effects seen at end of the run on Te and ne

– Correction meaningful at the of the run