Skip to main content

Diagnostic performance of the beam emission spectroscopy system on the National Spherical Torus Experiment

Publication ,  Conference
Smith, DR; Fonck, RJ; McKee, GR; Thompson, DS
Published in: Review of Scientific Instruments
October 1, 2012

The beam emission spectroscopy system on the National Spherical Torus Experiment measures localized density fluctuations on the ion gyroscale. Optical sightlines provide core to edge radial coverage, and the sightlines are aligned to typical pitch angles to maximize cross-field spatial resolution. Sightline images are 2-3 cm, and point spread function calculations indicate image distortion from pitch angle misalignment and atomic state finite lifetimes is minor with a 15% increase in the image size. New generation photodetectors achieve photon noise limited measurements at frequencies up to 400 kHz with refrigerant cooling at -20 °C. Measurements near the pedestal show broadband turbulence up to 100 kHz, and poloidal correlation lengths are about 10 cm. Plasma turbulence signals can be 2-3 orders of magnitude above photon noise and amplifier thermal noise. © 2012 American Institute of Physics.

Duke Scholars

Published In

Review of Scientific Instruments

DOI

ISSN

0034-6748

Publication Date

October 1, 2012

Volume

83

Issue

10

Related Subject Headings

  • Applied Physics
  • 51 Physical sciences
  • 40 Engineering
  • 34 Chemical sciences
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Smith, D. R., Fonck, R. J., McKee, G. R., & Thompson, D. S. (2012). Diagnostic performance of the beam emission spectroscopy system on the National Spherical Torus Experiment. In Review of Scientific Instruments (Vol. 83). https://doi.org/10.1063/1.4728094
Smith, D. R., R. J. Fonck, G. R. McKee, and D. S. Thompson. “Diagnostic performance of the beam emission spectroscopy system on the National Spherical Torus Experiment.” In Review of Scientific Instruments, Vol. 83, 2012. https://doi.org/10.1063/1.4728094.
Smith DR, Fonck RJ, McKee GR, Thompson DS. Diagnostic performance of the beam emission spectroscopy system on the National Spherical Torus Experiment. In: Review of Scientific Instruments. 2012.
Smith, D. R., et al. “Diagnostic performance of the beam emission spectroscopy system on the National Spherical Torus Experiment.” Review of Scientific Instruments, vol. 83, no. 10, 2012. Scopus, doi:10.1063/1.4728094.
Smith DR, Fonck RJ, McKee GR, Thompson DS. Diagnostic performance of the beam emission spectroscopy system on the National Spherical Torus Experiment. Review of Scientific Instruments. 2012.

Published In

Review of Scientific Instruments

DOI

ISSN

0034-6748

Publication Date

October 1, 2012

Volume

83

Issue

10

Related Subject Headings

  • Applied Physics
  • 51 Physical sciences
  • 40 Engineering
  • 34 Chemical sciences
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences