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Turbulence Diagnostics

NSTX-U Turbulence 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

Turbulence

k^rI <1

DR ~2 cm; r/a~0.4 to SOL

Dn/n >0.1%

Beam Emission Spectroscopy

2 arrays viewing heating beams with 2-D (radial and poloidal) array of 48 detector channels

D. Smith, G. McKee - UW

k^r~ 0.5-10

Density turbulence

5MHz BW

Dr ~ 1cm

 

Quadrature Doppler Backscattering (DBS)

1 Channel, 96 GHz (2015)

4 Channels (2016)

S. Kubota - UCLA

Cut-off

1-7 x1013cm-3

k^rI <1

2.5 MHz BW

Dr ~ 1cm

 

Quadrature reflectometer

30-75 GHz, 16 channels

S. Kubota - UCLA

Te < 200 eV

~ 1 cm for r/a> 0.8, <400 kHz

12 bit

gas puff imaging (GPI)

Supported by gas puff manifold.  (Phantom 710 camera)

S. Zweben – PPPL