An advanced neutral particle analyzer (ANPA) capable of simultaneously measuring hydrogen and deuterium ions of energies up to 45 keV has recently been developed for use on the Madison Symmetric Torus. The charge-to-mass separation allows for separate analysis of bulk deuterium ions and hydrogen ions injected with a 1 MW, 25 keV neutral beam. Orientation of the ANPA allows sampling of different regions of ion velocity space; a radial viewport favors collection of ions with high v⊥/|v| while a recently installed tangential viewport favors ions with high v||/|v|, such as those from the core-localized fast ion population created by the neutral beam. Signals are observed in the ANPA's highest energy channels during periodic magnetic reconnection events, which are drivers of anisotropic, non-Maxwellian ion energization in the reversed-field pinch. ANPA signal strength is dependent on the background neutral density, which also increases during magnetic reconnection events, so careful analysis must be performed to identify the true change in the ion distribution. A Monte Carlo neutral particle tracing code (NENE) is used to reconstruct neutral density profiles based on Dα line emission, which is measured using a 16-chord filtered photodiode array.
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October 2012
Research Article|
June 08 2012
Time-resolved ion energy distribution measurements using an advanced neutral particle analyzer on the MST reversed-field pincha)
S. Eilerman;
S. Eilerman
b)
1
University of Wisconsin–Madison
, Madison, Wisconsin 53706, USA
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J. K. Anderson;
J. K. Anderson
1
University of Wisconsin–Madison
, Madison, Wisconsin 53706, USA
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J. A. Reusch;
J. A. Reusch
1
University of Wisconsin–Madison
, Madison, Wisconsin 53706, USA
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D. Liu;
D. Liu
2
University of California–Irvine
, Irvine, California 92697, USA
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G. Fiksel;
G. Fiksel
3
University of Rochester
, Rochester, New York 14623, USA
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S. Polosatkin;
S. Polosatkin
4
Budker Institute of Nuclear Physics SB RAS
, Novosibirsk, Russia
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V. Belykh
V. Belykh
4
Budker Institute of Nuclear Physics SB RAS
, Novosibirsk, Russia
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a)
Contributed paper, published as part of the Proceedings of the 19th Topical Conference on High-Temperature Plasma Diagnostics, Monterey, California, May 2012.
Rev. Sci. Instrum. 83, 10D302 (2012)
Article history
Received:
May 07 2012
Accepted:
May 24 2012
Citation
S. Eilerman, J. K. Anderson, J. A. Reusch, D. Liu, G. Fiksel, S. Polosatkin, V. Belykh; Time-resolved ion energy distribution measurements using an advanced neutral particle analyzer on the MST reversed-field pinch. Rev. Sci. Instrum. 1 October 2012; 83 (10): 10D302. https://doi.org/10.1063/1.4728312
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