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

Abstract

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 onmore »« less

Authors:

^[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)

Publication Date:: Fri Jul 29 00:00:00 EDT 2016

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

Sponsoring Org.:: USDOE

OSTI Identifier:: 1368180

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

Resource Type:: Accepted Manuscript

Journal Name:: Review of Scientific Instruments

Additional Journal Information:: Journal Volume: 87; Journal Issue: 11; Journal ID: ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats


                    Liu, D., Heidbrink, W. W., Tritz, K., Fredrickson, E. D., Hao, G. Z., and Zhu, Y. B. Compact and multi-view solid state neutral particle analyzer arrays on National Spherical Torus Experiment-Upgrade.  United States: N. p., 2016. 
Web.  doi:10.1063/1.4959798.

Copy to clipboard


                    Liu, D., Heidbrink, W. W., Tritz, K., Fredrickson, E. D., Hao, G. Z., & Zhu, Y. B. Compact and multi-view solid state neutral particle analyzer arrays on National Spherical Torus Experiment-Upgrade.  United States.  https://doi.org/10.1063/1.4959798

Copy to clipboard


                    Liu, D., Heidbrink, W. W., Tritz, K., Fredrickson, E. D., Hao, G. Z., and Zhu, Y. B. Fri .  
"Compact and multi-view solid state neutral particle analyzer arrays on National Spherical Torus Experiment-Upgrade".  United States.  https://doi.org/10.1063/1.4959798.  https://www.osti.gov/servlets/purl/1368180.

Copy to clipboard


                    
@article{osti_1368180,

  title        = {Compact and multi-view solid state neutral particle analyzer arrays on National Spherical Torus Experiment-Upgrade},

  author       = {Liu, D. and Heidbrink, W. W. and Tritz, K. and Fredrickson, E. D. and Hao, G. Z. and Zhu, Y. B.},

  abstractNote = {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.},

  doi          = {10.1063/1.4959798},

  journal      = {Review of Scientific Instruments},

  number       = 11,

  volume       = 87,

  place        = {United States},

  year         = {Fri Jul 29 00:00:00 EDT 2016},

  month        = {Fri Jul 29 00:00:00 EDT 2016}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (DOE)

Publisher's Version of Record

https://doi.org/10.1063/1.4959798

Other availability

Search WorldCat to find libraries that may hold this journal

Citation Metrics:

Cited by: 7 works

Citation information provided by
Web of Science

Figures / Tables:

Figure 1: Top down view of NSTX-U with six NB sources (1A, 1B and 1C from NB line #1 and 2A, 2B and 2C from NB line #2) and sightlines of three SSNPA subsystems located at Bay B, I and L.

All figures and tables (6 total)

Save / Share:

Export Metadata

Save to My Library

Works referenced in this record:

Initial angle resolved measurements of fast neutrals using a multichannel linear AXUV detector system on LHD
journal, October 2006

Veshchev, E. A.; Ozaki, T.; Goncharov, P. R.
Review of Scientific Instruments, Vol. 77, Issue 10
DOI: 10.1063/1.2351916

The behaviour of fast ions in tokamak experiments
journal, April 1994

Heidbrink, W. W.; Sadler, G. J.
Nuclear Fusion, Vol. 34, Issue 4
DOI: 10.1088/0029-5515/34/4/I07

A photodiode-based neutral particle bolometer for characterizing charge-exchanged fast-ion behavior
journal, October 2012

Clary, R.; Smirnov, A.; Dettrick, S.
Review of Scientific Instruments, Vol. 83, Issue 10
DOI: 10.1063/1.4732860

Chapter 5: Physics of energetic ions
journal, June 2007

Fasoli, A.; Gormenzano, C.; Berk, H. L.
Nuclear Fusion, Vol. 47, Issue 6
DOI: 10.1088/0029-5515/47/6/S05

Performance of the solid state neutral particle analyzer array on the national spherical torus experiment
journal, October 2006

Liu, D.; Heidbrink, W. W.; Darrow, D. S.
Review of Scientific Instruments, Vol. 77, Issue 10
DOI: 10.1063/1.2227440

Compact multichannel neutral particle analyzer for measurement of energetic charge-exchanged neutrals in Alcator C-Mod
journal, August 2006

Tang, V.; Liptac, J.; Parker, R. R.
Review of Scientific Instruments, Vol. 77, Issue 8
DOI: 10.1063/1.2238519

Solid state neutral particle analyzer array on National Spherical Torus Experiment
journal, October 2004

Shinohara, K.; Darrow, D. S.; Roquemore, A. L.
Review of Scientific Instruments, Vol. 75, Issue 10
DOI: 10.1063/1.1785266

Design of solid state neutral particle analyzer array for National Spherical Torus Experiment-Upgrade
journal, November 2014

Liu, D.; Heidbrink, W. W.; Tritz, K.
Review of Scientific Instruments, Vol. 85, Issue 11
DOI: 10.1063/1.4889913

Overview of the physics and engineering design of NSTX upgrade
journal, July 2012

Menard, J. E.; Gerhardt, S.; Bell, M.
Nuclear Fusion, Vol. 52, Issue 8
DOI: 10.1088/0029-5515/52/8/083015

Compact solid-state neutral particle analyzer in current mode
journal, October 2012

Zhu, Y. B.; Bortolon, A.; Heidbrink, W. W.
Review of Scientific Instruments, Vol. 83, Issue 10
DOI: 10.1063/1.4732070

A new compact solid-state neutral particle analyser at ASDEX Upgrade: Setup and physics modeling
journal, July 2015

Schneider, P. A.; Blank, H.; Geiger, B.
Review of Scientific Instruments, Vol. 86, Issue 7
DOI: 10.1063/1.4926886

Invited Review Article: Contemporary instrumentation and application of charge exchange neutral particle diagnostics in magnetic fusion energy experiments
journal, January 2008

Medley, S. S.; Donné, A. J. H.; Kaita, R.
Review of Scientific Instruments, Vol. 79, Issue 1
DOI: 10.1063/1.2823259