Heavy ion beam probe advances from the first installation of the diagnostic on an RFP (invited)

Demers, D. R.; Fimognari, P. J.

doi:10.1063/1.4731758

Title: Heavy ion beam probe advances from the first installation of the diagnostic on an RFP (invited)

Journal Article · Tue Jul 10 00:00:00 EDT 2012 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4731758· OSTI ID:1767004

Demers, D. R. ^[1]; Fimognari, P. J. ^[1]

Xantho Technologies, LLC, Madison, WI (United States)

Heavy ion beam probes have been installed on a variety of toroidal devices but, the first and only application on a reversed field pinch is the diagnostic on the Madison Symmetric Torus. Simultaneous measurements of spatially localized equilibrium potential and fluctuations of density and potential, previously inaccessible in the core of the RFP, are now attainable. These measurements reflect the unique strength of the heavy ion beam probe (HIBP) diagnostic. They will help determine the characteristics and evolution of electrostatic fluctuations and their role in transport, and determine the relation of the interior electric field and flows. Many aspects of the RFP present original challenges to HIBP operation and inference of plasma quantities. The magnetic field contributes to a number of the issues: the comparable magnitudes of the toroidal and poloidal fields and edge reversal result in highly three dimensional beam trajectories; partial generation of the magnetic field by plasma current cause it and hence the beam trajectories to vary with time; and temporal topology and amplitude changes are common. Associated complications include strong ultraviolet radiation and elevated particle losses that can alter functionality of the electrostatic systems and generate noise on the detectors. These complexities have necessitated the development of new operation and data analysis techniques: the implementation of primary and secondary beamlines, adoption of alternative beam steering methods, development of higher precision electrostatic system models, refinement of trajectory calculations and sample volume modeling, establishment of stray-particle and noise reduction methods, and formulation of alternative data analysis techniques. Furthermore, these innovative methods and the knowledge gained with this system are likely to translate to future HIBP operation on large scale stellarators and tokamaks.

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Research Organization:: Xantho Technologies, LLC, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: SC0006077

OSTI ID:: 1767004

Journal Information:: Review of Scientific Instruments, Vol. 83, Issue 10; Conference: 19th Topical Conference on High Temperature Plasma Diagnostics, Monterey, CA (United States), 8 May 2012; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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References (20)

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Cited By (1)

Noise mitigation methods for ion detectors operating with a direct view of high temperature plasmas Fimognari, P. J.; Crowley, T. P.; Demers, D. R. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5039348	journal	October 2018

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