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ICRF Diagnostics

NSTX-U Measurement Capabilities

(black – routine operation, blue – under active development)

Physics Measurement

Typical range and coverage

Spatial; Temporal Resolution

Typical Precision

Available Diagnostic Techniques



Core RF waves

2x1012– 3.5x1013 cm-3

Up to 45 kHz, 4064 sweeps

≤1 cm

reflectometry FM/CW

13 – 53 GHz swept, some modifications required from standard profile reflectometry

S. Kubota - UCLA

RF driven surface waves




high-frequency Langmuir probe

located between antenna segments,

R. Wilson – PPPL,

J. Wilgen - ORNL