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Electron Diagnostics

NSTX-U Electron Diagnostic Measurement Capabilities – January 2015

(black – available for experiments, blue – under active development)

Physics Measurement

Typical range and coverage

Spatial; Temporal Resolution

Typical Precision

Available Diagnostic Techniques

Comment

Contact

Electron density line integral

>2x1011 cm-2

4 MHz

2x1011 cm-2

Tangential interferometry, polarimetry (FIReTIP)

FIR laser with retro-reflector in 1 tangential chord with Rtan=0.64 m

C. Domier – UC Davis, Y. Ren - PPPL

Electron density profile

5x1011 - 5x1014 cm-3

3.0 cm core,

0.9 cm edge, 2 30 Hz lasers

>3%

Thomson scattering

60 Hz Nd:YAG, laser nearly radial on horizontal midplane, 42 of 48 channels implemented

B. LeBlanc, A. Diallo, M. Coury – PPPL

0.02-1.6x1013 cm-3

1 kHz

 

Reflectometry (SOL)

6 - 36 Ghz swept system, 1 kHz sweep rate

C. Lau - ORNL

Real time density for density feedback control

>2x1011 cm-2

5kHz

2x1011 cm-2

Tangential interferometry, polarimetry (FIReTIP)

FIR laser with retro-reflector in 1 tangential chord with Rtan=0.64 m

C. Domier – UC Davis, Y. Ren - PPPL

Electron temperature profile

0.003 – 5 keV

3.0 cm core,

0.9 cm edge, 2 30 Hz lasers

>3%

Thomson Scattering

2 - 30 Hz Nd:YAG lasers nearly radial on horizontal midplane, 42 of 48 possible spatial channels implemented

B. LeBlanc, A. Diallo, M. Coury – PPPL

0.1-5 keV

1 cm, < 10 kHz

5% (rel)

Edge (r/a: 0.6-1.1) tangential multi-color SXR arrays

5 color/ 20 spatial channels, AXUV diode arrays

K. Tritz, J. M. Burgos– JHU

0.1-5 keV

3 cm, < 10 kHz

5% (rel)

Core (r/a: 0-1.1) tangential multi-color SXR arrays

5 color/ 20 spatial channels, AXUV diode arrays

K. Tritz, J. M. Burgos– JHU