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Title: Optimization of the angular orientation for a fast ion loss detector in a tokamak

Abstract

A scintillator type fast ion loss detector measures the gyroradius and pitch angle distribution of superthermal ions escaping from a magnetically confined fusion plasma at a single location. Described here is a technique for optimizing the angular orientation of such a detector in an axisymmetric tokamak geometry in order to intercept losses over a useful and interesting ranges of pitch angle. The method consists of evaluating the detector acceptance as a function of the fast ion constants of motion, i.e. energy, canonical toroidal momentum, and magnetic moment. The detector acceptance can then be plotted in a plane of constant energy and compared with the relevant orbit class boundaries and fast ion source distributions. Knowledge of expected or interesting mechanisms of loss can further guide selection of the detector orientation. The example of a fast ion loss detector for the National Spherical Torus Experiment-Upgrade (NSTX-U) is considered.

Authors:

  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
DOE Contract Number:  
AC02-09CH11466
Product Type:
Dataset
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Tokamak Fast ion loss Particle phase space
Keywords:
Tokamak Fast ion loss Particle phase space
OSTI Identifier:
1367551
DOI:
10.11578/1367551

Citation Formats

Darrow, D. Optimization of the angular orientation for a fast ion loss detector in a tokamak. United States: N. p., 2017. Web. doi:10.11578/1367551.
Darrow, D. Optimization of the angular orientation for a fast ion loss detector in a tokamak. United States. doi:10.11578/1367551.
Darrow, D. 2017. "Optimization of the angular orientation for a fast ion loss detector in a tokamak". United States. doi:10.11578/1367551. https://www.osti.gov/servlets/purl/1367551. Pub date:Sun Jan 01 00:00:00 EST 2017
@article{osti_1367551,
title = {Optimization of the angular orientation for a fast ion loss detector in a tokamak},
author = {Darrow, D.},
abstractNote = {A scintillator type fast ion loss detector measures the gyroradius and pitch angle distribution of superthermal ions escaping from a magnetically confined fusion plasma at a single location. Described here is a technique for optimizing the angular orientation of such a detector in an axisymmetric tokamak geometry in order to intercept losses over a useful and interesting ranges of pitch angle. The method consists of evaluating the detector acceptance as a function of the fast ion constants of motion, i.e. energy, canonical toroidal momentum, and magnetic moment. The detector acceptance can then be plotted in a plane of constant energy and compared with the relevant orbit class boundaries and fast ion source distributions. Knowledge of expected or interesting mechanisms of loss can further guide selection of the detector orientation. The example of a fast ion loss detector for the National Spherical Torus Experiment-Upgrade (NSTX-U) is considered.},
doi = {10.11578/1367551},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {1}
}

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