Compact and multi-view solid state neutral particle analyzer arrays on National Spherical Torus Experiment-Upgrade

Liu, D.; Heidbrink, W. W.; Tritz, K.; Fredrickson, E. D.; Hao, G. Z.; Zhu, Y. B.

doi:10.1063/1.4959798

Title: Compact and multi-view solid state neutral particle analyzer arrays on National Spherical Torus Experiment-Upgrade

Journal Article · Fri Jul 29 00:00:00 EDT 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4959798· OSTI ID:1368180

^[1]; Heidbrink, W. W. ^[1]; Tritz, K. ^[2]; Fredrickson, E. D. ^[3]; Hao, G. Z. ^[1]; Zhu, Y. B. ^[1]

Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
Johns Hopkins Univ., Baltimore, MD (United States). Department of Physics and Astronomy
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

A compact and multi-view solid state neutral particle analyzer (SSNPA) diagnostic based on silicon photodiode arrays has been successfully tested on the National Spherical Torus Experiment-Upgrade. The SSNPA diagnostic provides spatially, temporally, and pitch-angle resolved measurements of fast-ion distribution by detecting fast neutral flux resulting from the charge exchange (CX) reactions. The system consists of three 16-channel subsystems: t-SSNPA viewing the plasma mid-radius and neutral beam (NB) line #2 tangentially, r-SSNPA viewing the plasma core and NB line #1 radially, and p-SSNPA with no intersection with any NB lines. Due to the setup geometry, the active CX signals of t-SSNPA and r-SSNPA are mainly sensitive to passing and trapped particles, respectively. Additionally, both t-SSNPA and r-SSNPA utilize three vertically stacked arrays with different filter thicknesses to obtain coarse energy information. The experimental data show that all channels are operational. The signal to noise ratio is typically larger than 10, and the main noise is x-ray induced signal. The active and passive CX signals are clearly observed on t-SSNPA and r-SSNPA during NB modulation. The SSNPA data also indicate significant losses of passing particles during sawteeth, while trapped particles are weakly affected. Fluctuations up to 120 kHz have been observed on SSNPA, and they are strongly correlated with magnetohydrodynamics instabilities.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466; FG02-06ER54867; FG03-02ER54681

OSTI ID:: 1368180

Journal Information:: Review of Scientific Instruments, Vol. 87, Issue 11; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Compact and multi-view solid state neutral particle analyzer arrays on National Spherical Torus Experiment-Upgrade Liu, D.; Heidbrink, W. W.; Tritz, K. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States) https://doi.org/10.11578/1367167	dataset	January 2016
Compact and multi-view solid state neutral particle analyzer arrays on National Spherical Torus Experiment-Upgrade Liu, D.; Heidbrink, W.; Tritz, K. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States) https://doi.org/10.11578/1562050	dataset	January 2016
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Compact and multi-view solid state neutral particle analyzer arrays on National Spherical Torus Experiment-Upgrade Liu, D.; Heidbrink, W. W.; Tritz, K. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States) https://doi.org/10.11578/1367167	dataset	January 2016
Compact and multi-view solid state neutral particle analyzer arrays on National Spherical Torus Experiment-Upgrade Liu, D.; Heidbrink, W.; Tritz, K. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States) https://doi.org/10.11578/1562050	dataset	January 2016