The motional Stark effect diagnostic on NSTX

Journal Article · Wed Oct 15 04:00:00 EDT 2008 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2968699· OSTI ID:21266676

Levinton, F M; Yuh, H ^[1]

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1. Nova Photonics, Inc., Princeton, New Jersey 08540 (United States)

This work describes the implementation and recent results from the motional Stark effect (MSE) collisionally induced fluorescence diagnostic on NSTX. Due to the low magnetic field on NSTX the MSE diagnostic requires a new approach for the viewing optics and spectral filter. This has been accomplished with a novel optical design that reduces the geometric Doppler broadening, and a high throughput, high resolution spectral filter to optimize signal-to-noise ratio. With these improvements the polarization fraction is {approx}30%-40% and, combined with the large throughput, a time resolution of {approx}5 ms. The MSE diagnostic presently has 16 sight lines operating, providing measurements of the magnetic field line pitch from the plasma center to near the outboard edge of the plasma.

• OSTI ID: 21266676
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 79; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DESIGN
DOPPLER BROADENING
FILTERS
FLUORESCENCE
IMPLEMENTATION
MAGNETIC FIELDS
NSTX DEVICE
PITCHES
PLASMA
PLASMA DIAGNOSTICS
POLARIZATION
SIGNAL-TO-NOISE RATIO
STARK EFFECT
TIME RESOLUTION