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

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

doi:10.1063/1.3478660

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

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

PPPL NSTX

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

35 Scopus citations

Abstract

A beam emission spectroscopy (BES) system has been installed on the National Spherical Torus Experiment (NSTX) to study ion gyroscale fluctuations. The BES system measures D_α emission 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 field 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 Alfv́n/energetic particle modes on NSTX.

Original language	English (US)
Article number	10D717
Journal	Review of Scientific Instruments
Volume	81
Issue number	10
DOIs	https://doi.org/10.1063/1.3478660
State	Published - Oct 2010

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.3478660

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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 fluctuations. The BES system measures Dα emission 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 field 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 Alf{\'v}n/energetic particle modes on NSTX.",

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

year = "2010",

month = oct,

doi = "10.1063/1.3478660",

language = "English (US)",

volume = "81",

journal = "Review of Scientific Instruments",

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publisher = "American Institute of Physics",

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

AU - Smith, D. R.

AU - Feder, H.

AU - Feder, R.

AU - Fonck, R. J.

AU - Labik, G.

AU - McKee, G. R.

AU - Schoenbeck, N.

AU - Stratton, B. C.

AU - Uzun-Kaymak, I.

AU - Winz, G.

PY - 2010/10

Y1 - 2010/10

N2 - A beam emission spectroscopy (BES) system has been installed on the National Spherical Torus Experiment (NSTX) to study ion gyroscale fluctuations. The BES system measures Dα emission 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 field 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 Alfv́n/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 fluctuations. The BES system measures Dα emission 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 field 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 Alfv́n/energetic particle modes on NSTX.

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UR - https://www.scopus.com/pages/publications/78149460429#tab=citedBy

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JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 10

M1 - 10D717

ER -

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

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