Sensitivity of MSE measurements on the beam atomic level population

Journal Article · Tue Nov 15 00:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4959914· OSTI ID:22596474

Kumar, S. T. A.; Anderson, F. S. B.; Anderson, D. T. ^[1]

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1. University of Wisconsin–Madison, Madison, Wisconsin 53706 (United States)

The effect of variation in atomic level population of a neutral beam on the Motional Stark Effect (MSE) measurements is investigated in the low density plasmas of HSX stellarator. A 30 KeV, 4 A, 3 ms hydrogen diagnostic neutral beam is injected into HSX plasmas of line averaged electron density ranging from 2 to 4 ⋅ 10{sup 18} m{sup −3} at a magnetic field of 1 T. For this density range, the excited level population of the hydrogen neutral beam is expected to undergo variations. Doppler shifted and Stark split H{sub α} and H{sub β} emissions from the beam are simultaneously measured using two cross-calibrated spectrometers. The emission spectrum is simulated and fit to the experimental measurements and the deviation from a statistically populated beam is investigated.

• OSTI ID: 22596474
• Journal Information: Review of Scientific Instruments, Vol. 87, Issue 11; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAMS
DOPPLER EFFECT
ELECTRON DENSITY
EMISSION
EMISSION SPECTRA
EXCITED STATES
HSX STELLARATOR
HYDROGEN
KEV RANGE 10-100
MAGNETIC FIELDS
PLASMA DENSITY
SENSITIVITY
SIMULATION
SPECTROMETERS
STARK EFFECT