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NSTX-U Turbulence Diagnostic Measurement
Capabilities – January 2015
(black – available
for experiments, blue – under active development)
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Physics
Measurement
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Typical range
and coverage
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Spatial;
Temporal Resolution
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Typical
Precision
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Available
Diagnostic Techniques
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Comment
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Contact
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Turbulence
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k^rI <1
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DR ~2 cm; r/a~0.4 to SOL
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Dn/n >0.1%
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Beam
Emission Spectroscopy
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2 arrays viewing heating beams with
2-D (radial and poloidal) array of 48 detector channels
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D. Smith, G. McKee - UW
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k^rI ~ 0.5-10
Density turbulence
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5MHz BW
Dr ~ 1cm
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Quadrature Doppler Backscattering (DBS)
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1 Channel, 96 GHz (2015)
4 Channels (2016)
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S. Kubota - UCLA
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Cut-off
1-7 x1013cm-3
k^rI <1
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2.5 MHz BW
Dr ~ 1cm
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Quadrature reflectometer
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30-75 GHz, 16 channels
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S. Kubota - UCLA
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Te < 200 eV
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~ 1 cm for r/a> 0.8, <400 kHz
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12 bit
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gas puff imaging (GPI)
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Supported by gas puff manifold. (Phantom 710 camera)
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S. Zweben – PPPL
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