Overview of the beam emission spectroscopy diagnostic system on the National Spherical Torus Experiment

D. R. Smith; R. J. Fonck; G. R. McKee; N. Schoenbeck; I. Uzun-Kaymak; G. Winz; F. Feder; R. Feder; G. Labik; B. C. Stratton

doi:10.1109/20.305828

Overview of the beam emission spectroscopy diagnostic system on the National Spherical Torus Experiment

D. R. Smith, R. J. Fonck, G. R. McKee, N. Schoenbeck, I. Uzun-Kaymak, G. Winz, F. Feder, R. Feder, G. Labik, B. C. Stratton

PPPL NSTX

Research output: Contribution to journal › Article › peer-review

Abstract

A beam emission spectroscopy (BES) system has been installed on the National Spherical Torus Experiment (NSTX) to study ion gyroscale ?uctuations. The BES system measures D_αemission from a deuterium neutral heating beam. The system includes two optical views centered at r/a ≈0.45 and 0.85 and aligned to magnetic ?eld pitch angles at the neutral beam. f/1.5 collection optics produce 2-3 cm spot sizes at the neutral beam. The initial channel layout includes radial arrays, poloidal arrays, and two-dimensional grids. Radial arrays provide coverage from r/a≈0.1 to beyond the last-closed flux surface. Photodetectors and digital filters provide high-sensitivity, low-noise measurements at frequencies of up to 1 MHz. The BES system will be a valuable tool for investigating ion gyroscale turbulence and Alfv'n/energetic particle modes on NSTX.

Original language	English (US)
Pages (from-to)	2665-2668
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	30
Issue number	4
DOIs	https://doi.org/10.1109/20.305828
State	Published - Jul 1994

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/20.305828

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title = "Overview of the beam emission spectroscopy diagnostic system on the National Spherical Torus Experiment",

abstract = "A beam emission spectroscopy (BES) system has been installed on the National Spherical Torus Experiment (NSTX) to study ion gyroscale ?uctuations. The BES system measures Dαemission from a deuterium neutral heating beam. The system includes two optical views centered at r/a ≈0.45 and 0.85 and aligned to magnetic ?eld pitch angles at the neutral beam. f/1.5 collection optics produce 2-3 cm spot sizes at the neutral beam. The initial channel layout includes radial arrays, poloidal arrays, and two-dimensional grids. Radial arrays provide coverage from r/a≈0.1 to beyond the last-closed flux surface. Photodetectors and digital filters provide high-sensitivity, low-noise measurements at frequencies of up to 1 MHz. The BES system will be a valuable tool for investigating ion gyroscale turbulence and Alfv'n/energetic particle modes on NSTX.",

author = "Smith, \{D. R.\} and Fonck, \{R. J.\} and McKee, \{G. R.\} and N. Schoenbeck and I. Uzun-Kaymak and G. Winz and F. Feder and R. Feder and G. Labik and Stratton, \{B. C.\}",

year = "1994",

month = jul,

doi = "10.1109/20.305828",

language = "English (US)",

volume = "30",

pages = "2665--2668",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

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T1 - Overview of the beam emission spectroscopy diagnostic system on the National Spherical Torus Experiment

AU - Smith, D. R.

AU - Fonck, R. J.

AU - McKee, G. R.

AU - Schoenbeck, N.

AU - Uzun-Kaymak, I.

AU - Winz, G.

AU - Feder, F.

AU - Feder, R.

AU - Labik, G.

AU - Stratton, B. C.

PY - 1994/7

Y1 - 1994/7

N2 - A beam emission spectroscopy (BES) system has been installed on the National Spherical Torus Experiment (NSTX) to study ion gyroscale ?uctuations. The BES system measures Dαemission from a deuterium neutral heating beam. The system includes two optical views centered at r/a ≈0.45 and 0.85 and aligned to magnetic ?eld pitch angles at the neutral beam. f/1.5 collection optics produce 2-3 cm spot sizes at the neutral beam. The initial channel layout includes radial arrays, poloidal arrays, and two-dimensional grids. Radial arrays provide coverage from r/a≈0.1 to beyond the last-closed flux surface. Photodetectors and digital filters provide high-sensitivity, low-noise measurements at frequencies of up to 1 MHz. The BES system will be a valuable tool for investigating ion gyroscale turbulence and Alfv'n/energetic particle modes on NSTX.

AB - A beam emission spectroscopy (BES) system has been installed on the National Spherical Torus Experiment (NSTX) to study ion gyroscale ?uctuations. The BES system measures Dαemission from a deuterium neutral heating beam. The system includes two optical views centered at r/a ≈0.45 and 0.85 and aligned to magnetic ?eld pitch angles at the neutral beam. f/1.5 collection optics produce 2-3 cm spot sizes at the neutral beam. The initial channel layout includes radial arrays, poloidal arrays, and two-dimensional grids. Radial arrays provide coverage from r/a≈0.1 to beyond the last-closed flux surface. Photodetectors and digital filters provide high-sensitivity, low-noise measurements at frequencies of up to 1 MHz. The BES system will be a valuable tool for investigating ion gyroscale turbulence and Alfv'n/energetic particle modes on NSTX.

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JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 4

ER -

Overview of the beam emission spectroscopy diagnostic system on the National Spherical Torus Experiment

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