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Energetic Particle Diagnostics

NSTX-U Energetic Particle 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

Fusion source profile

 

 

 

Si diode detectors

6-8 channels planned

W. Boeglin – Florida Int’l U

Neutron flux monitors

 

1 ms

5% rel.

20% abs.

Fission chambers

4 U235 detectors with x26 sensitivity ratio

D. Darrow - PPPL

 

4 microsec

<5% rel.

Scintillator detectors

Plastic scintillators with PM tubes 1- ZnS; 3 BC400

D. Darrow - PPPL

Runaway electrons

 

10 ms

30%

Hard X-ray detector

At start-up and thermal quench

L. Delgado-Aparicio- PPPL

Fast Lost Ions

 

 

 

FLIP

Radial array of Faraday cups

D. Darrow - PPPL

 

50 kHz

3 cm

SFLIP

Scintillator probe with energy and pitch angle resolution

D. Darrow - PPPL

Fast ion dynamics and Fast ion distribution

n < 5x1013 cm-3

10ms, 5cm, 10keV

 

s-FIDA - Spectrometer/CCD (energy resolved signal)

Vertical views from Bay A/B. Tangential views from Bay L/F. Based on active charge-exchange spectroscopy: requires NB injection; MPTS and CHERS data needed for analysis

D. Liu, G.Z. Hao, W.W. Heidbrink   – UCI

20ms, R=100, 120,140cm

 

f-FIDA - Band-Pass Filter/PMT (energy-integrated signal)

D. Liu, G.Z. Hao, W.W. Heidbrink   – UCI

 

10ms in current mode, 5cm, three energy bands [>25, >45, >65] keV

 

Solid state NPA system

(t-SSNPA: subsystem at Bay I for active tangential views,

 r-SSNPA:  subsystem at Bay L midplane for active radial views

 p-SSNPA: subsystem at Bay B for background passive signals)

15 tangential views  with Rmaj  between 90-130 cm; 15 radial views  with Rmaj  between 120-145 cm; 15 passive views; Si- diode arrays in current mode, 500kHz sample rate, ~100kHz bandwidth ; requires NB injection; MPTS and CHERS data needed for analysis

D. Liu, G.Z. Hao, W.W. Heidbrink   – UCI