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Title: A novel, cost-effective, multi-point Thomson scattering system on the Pegasus Toroidal Experiment (invited)

Abstract

Here, a novel, cost-effective, multi-point Thomson scattering system has been designed, implemented, and operated on the Pegasus Toroidal Experiment. Leveraging advances in Nd:YAG lasers, high-efficiency volume phase holographic transmission gratings, and increased quantum-efficiency Generation 3 image-intensified charge coupled device (ICCD) cameras, the system provides Thomson spectra at eight spatial locations for a single grating/camera pair. The on-board digitization of the ICCD camera enables easy modular expansion, evidenced by recent extension from 4 to 12 plasma/background spatial location pairs. Stray light is rejected using time-of-flight methods suited to gated ICCDs, and background light is blocked during detector readout by a fast shutter. This –10 3 reduction in background light enables further expansion to up to 24 spatial locations. The implementation now provides single-shot T e(R) for n e > 5 × 10 18 m –3.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Wisconsin-Madison, Madison, WI (United States)
Publication Date:
Research Org.:
Univ. of Wisconsin-Madison, Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1334080
Grant/Contract Number:  
FG02-96ER54375
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Related Information: D.J. Schlossberg, G.M. Bodner, J.A. Reusch, M.W. Bongard, R.J. Fonck, and C. Rodriguez Sanchez, "Public Data Set: A Novel, Cost-Effective, Multi-Point Thomson Scattering System on the Pegasus Toroidal Experiment," DOI: 10.18138/1257860; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; cameras; diffraction gratings; plasma diagnostics; calibration; light scattering

Citation Formats

Schlossberg, David J., Bodner, Grant M., Bongard, Michael W., Fonck, Raymond J., Reusch, Joshua A., and Rodriguez Sanchez, Cuauhtemoc. A novel, cost-effective, multi-point Thomson scattering system on the Pegasus Toroidal Experiment (invited). United States: N. p., 2016. Web. doi:10.1063/1.4962193.
Schlossberg, David J., Bodner, Grant M., Bongard, Michael W., Fonck, Raymond J., Reusch, Joshua A., & Rodriguez Sanchez, Cuauhtemoc. A novel, cost-effective, multi-point Thomson scattering system on the Pegasus Toroidal Experiment (invited). United States. doi:10.1063/1.4962193.
Schlossberg, David J., Bodner, Grant M., Bongard, Michael W., Fonck, Raymond J., Reusch, Joshua A., and Rodriguez Sanchez, Cuauhtemoc. Fri . "A novel, cost-effective, multi-point Thomson scattering system on the Pegasus Toroidal Experiment (invited)". United States. doi:10.1063/1.4962193. https://www.osti.gov/servlets/purl/1334080.
@article{osti_1334080,
title = {A novel, cost-effective, multi-point Thomson scattering system on the Pegasus Toroidal Experiment (invited)},
author = {Schlossberg, David J. and Bodner, Grant M. and Bongard, Michael W. and Fonck, Raymond J. and Reusch, Joshua A. and Rodriguez Sanchez, Cuauhtemoc},
abstractNote = {Here, a novel, cost-effective, multi-point Thomson scattering system has been designed, implemented, and operated on the Pegasus Toroidal Experiment. Leveraging advances in Nd:YAG lasers, high-efficiency volume phase holographic transmission gratings, and increased quantum-efficiency Generation 3 image-intensified charge coupled device (ICCD) cameras, the system provides Thomson spectra at eight spatial locations for a single grating/camera pair. The on-board digitization of the ICCD camera enables easy modular expansion, evidenced by recent extension from 4 to 12 plasma/background spatial location pairs. Stray light is rejected using time-of-flight methods suited to gated ICCDs, and background light is blocked during detector readout by a fast shutter. This –103 reduction in background light enables further expansion to up to 24 spatial locations. The implementation now provides single-shot Te(R) for ne > 5 × 1018 m–3.},
doi = {10.1063/1.4962193},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {2016},
month = {9}
}

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Cited by: 2 works
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Works referenced in this record:

High Confinement Mode and Edge Localized Mode Characteristics in a Near-Unity Aspect Ratio Tokamak
journal, April 2016


Control and automation of the Pegasus multi-point Thomson scattering system
journal, August 2016

  • Bodner, G. M.; Bongard, M. W.; Fonck, R. J.
  • Review of Scientific Instruments, Vol. 87, Issue 11, Article No. 11E523
  • DOI: 10.1063/1.4960499

    Works referencing / citing this record:

    Public Data Set: A Power-Balance Model for Local Helicity Injection Startup in a Spherical Tokamak
    dataset, May 2018

    • Barr, J. L.; Bongard, M. W.; Burke, M. G.
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    Public Data Set: Non-inductively Driven Tokamak Plasmas at Near-Unity βt in the Pegasus Toroidal Experiment
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    • Pegasus-Supplementary information for journal article at DOI: 10.1063/1.5017966, 1 file (5.1 MB)
    • DOI: 10.18138/1410490

    Public Data Set: Initiation and Sustainment of Tokamak Plasmas with Local Helicity Injection as the Majority Current Drive
    dataset, July 2018

    • Perry, Justin; Bodner, Grant; Bongard, Michael
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    • DOI: 10.18138/1419641

    Public Data Set: Radially Scanning Magnetic Probes to Study Local Helicity Injection Dynamics
    dataset, July 2018

    • Richner, Nathan; Bongard, Michael; Fonck, Raymond
    • Pegasus-Supplementary information for journal article at DOI: 10.1063/1.5036527, 1 file (9.4 MB)
    • DOI: 10.18138/1432455

    Public Data Set: A Power-Balance Model for Local Helicity Injection Startup in a Spherical Tokamak
    dataset, May 2018

    • Barr, J. L.; Bongard, M. W.; Burke, M. G.
    • Pegasus Public Data Sets
    • DOI: 10.18138/1345037

    Public Data Set: Non-inductively Driven Tokamak Plasmas at Near-Unity βt in the Pegasus Toroidal Experiment
    dataset, March 2018

    • Reusch, Joshua; Bodner, Grant; Bongard, Michael
    • Pegasus-Supplementary information for journal article at DOI: 10.1063/1.5017966, 1 file (5.1 MB)
    • DOI: 10.18138/1410490

    Public Data Set: Initiation and Sustainment of Tokamak Plasmas with Local Helicity Injection as the Majority Current Drive
    dataset, July 2018

    • Perry, Justin; Bodner, Grant; Bongard, Michael
    • Pegasus-Supplementary information for journal article at DOI: https://doi.org/10.1088/1741-4326/aac72e, 1 file (17.1 MB)
    • DOI: 10.18138/1419641

    Public Data Set: Radially Scanning Magnetic Probes to Study Local Helicity Injection Dynamics
    dataset, July 2018

    • Richner, Nathan; Bongard, Michael; Fonck, Raymond
    • Pegasus-Supplementary information for journal article at DOI: 10.1063/1.5036527, 1 file (9.4 MB)
    • DOI: 10.18138/1432455