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Title: Development of a 3-D visible limiter imaging system for the HSX stellarator

Abstract

A visible camera diagnostic has been developed to study the Helically Symmetric eXperiment (HSX) limiter plasma interaction. A straight line view from the camera location to the limiter was not possible due to the complex 3D stellarator geometry of HSX, so it was necessary to insert a mirror/lens system into the plasma edge. A custom support structure for this optical system tailored to the HSX geometry was designed and installed. This system holds the optics tube assembly at the required angle for the desired view to both minimize system stress and facilitate robust and repeatable camera positioning. The camera system has been absolutely calibrated and using H α and C-III filters can provide hydrogen and carbon photon fluxes, which through an S/XB coefficient can be converted into particle fluxes. The resulting measurements have been used to obtain the characteristic penetration length of hydrogen and C-III species. Here, the hydrogen λ iz value shows reasonable agreement with the value predicted by a 1D penetration length calculation.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. Univ. of Wisconsin–Madison, Madison, WI (United States)
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1540125
Grant/Contract Number:  
FG02-93ER54222
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 88; Journal Issue: 12; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; Instruments & Instrumentation; Physics

Citation Formats

Buelo, C., Stephey, L., Anderson, F. S. B., Eisert, D., and Anderson, D. T. Development of a 3-D visible limiter imaging system for the HSX stellarator. United States: N. p., 2017. Web. doi:10.1063/1.5000855.
Buelo, C., Stephey, L., Anderson, F. S. B., Eisert, D., & Anderson, D. T. Development of a 3-D visible limiter imaging system for the HSX stellarator. United States. doi:10.1063/1.5000855.
Buelo, C., Stephey, L., Anderson, F. S. B., Eisert, D., and Anderson, D. T. Fri . "Development of a 3-D visible limiter imaging system for the HSX stellarator". United States. doi:10.1063/1.5000855. https://www.osti.gov/servlets/purl/1540125.
@article{osti_1540125,
title = {Development of a 3-D visible limiter imaging system for the HSX stellarator},
author = {Buelo, C. and Stephey, L. and Anderson, F. S. B. and Eisert, D. and Anderson, D. T.},
abstractNote = {A visible camera diagnostic has been developed to study the Helically Symmetric eXperiment (HSX) limiter plasma interaction. A straight line view from the camera location to the limiter was not possible due to the complex 3D stellarator geometry of HSX, so it was necessary to insert a mirror/lens system into the plasma edge. A custom support structure for this optical system tailored to the HSX geometry was designed and installed. This system holds the optics tube assembly at the required angle for the desired view to both minimize system stress and facilitate robust and repeatable camera positioning. The camera system has been absolutely calibrated and using Hα and C-III filters can provide hydrogen and carbon photon fluxes, which through an S/XB coefficient can be converted into particle fluxes. The resulting measurements have been used to obtain the characteristic penetration length of hydrogen and C-III species. Here, the hydrogen λiz value shows reasonable agreement with the value predicted by a 1D penetration length calculation.},
doi = {10.1063/1.5000855},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 12,
volume = 88,
place = {United States},
year = {2017},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1 FIG. 1: (a) Autodesk Inventor rendering of the limiterviewing optics and boxport with the limiter. The camera position is directly above the lenses, and the camera viewing cone is shown in orange, and portions of the cone that intersect with the HSX vacuum vessel can be seen. (b) One ofmore » the two HSX graphite limiters, inserted at the top of the boxport. The micrometer stage allows the limiter to be incrementally inserted and removed. LCFS in the figure stands for the last closed flux surface, separating the core from the edge, which the limiter is designed to follow. (c) Overhead view of the limiter-viewing optics and boxport showing geometry required to view the limiter.« less

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Works referenced in this record:

Plasma Edge Diagnostics for TEXTOR
journal, February 2005

  • Brezinsek, S.; Huber, A.; Jachmich, S.
  • Fusion Science and Technology, Vol. 47, Issue 2
  • DOI: 10.13182/fst05-a701

Development of the gas-puff imaging diagnostic in the TEXTOR tokamak
journal, May 2013

  • Shesterikov, I.; Xu, Y.; Berte, M.
  • Review of Scientific Instruments, Vol. 84, Issue 5
  • DOI: 10.1063/1.4803934

Direct evidence of eddy breaking and tilting by edge sheared flows observed in the TEXTOR tokamak
journal, March 2012


Three-dimensional scrape off layer transport in the helically symmetric experiment HSX
journal, June 2016


Reduced particle and heat transport with quasisymmetry in the Helically Symmetric Experiment
journal, May 2007

  • Canik, J. M.; Anderson, D. T.; Anderson, F. S. B.
  • Physics of Plasmas, Vol. 14, Issue 5
  • DOI: 10.1063/1.2709862

Plasma edge diagnostics by optical methods
journal, December 1984


3D Edge Modeling and Island Divertor Physics
journal, April 2004

  • Feng, Y.; Sardei, F.; Kisslinger, J.
  • Contributions to Plasma Physics, Vol. 44, Issue 13
  • DOI: 10.1002/ctpp.200410009

    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.