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Review of Scientific Instruments / Volume 81 / Issue 10 / PROCEEDINGS OF THE 18TH TOPICAL CONFERENCE ON HIGH-TEMPERATURE PLASMA DIAGNOSTICS, WILDWOOD, NEW JERSEY, USA, 2010 / Backscattering, Electron Cyclotron Emission, Electron Bernstein Waves, and Reflectometry—Brentley C. Stratton, Session Chairman

Rev. Sci. Instrum. 81, 10D905 (2010); http://dx.doi.org/10.1063/1.3475786 (4 pages)

A spinning mirror for fast angular scans of EBW emission for magnetic pitch profile measurements a

a Contributed paper, published as part of the Proceedings of the 18th Topical Conference on High-Temperature Plasma Diagnostics, Wildwood, New Jersey, May 2010.
Francesco Volpe

Department of Engineering Physics, University of Wisconsin, Madison, Wisconsin 53706, USA

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(Received 17 May 2010; accepted 15 June 2010; published online 4 October 2010)

A tilted spinning mirror rapidly steers the line of sight of the electron Bernstein wave (EBW) emission radiometer at the Mega-Amp Spherical Tokamak (MAST). In order to resist high mechanical stresses at rotation speeds of up to 12 000 rpm and to avoid eddy current induced magnetic braking, the mirror consists of a glass-reinforced nylon substrate of a special self-balanced design, coated with a reflecting layer. By completing an angular scan every 2.5–10 ms, it allows one to characterize with good time resolution the Bernstein-extraordinary-ordinary mode-conversion efficiency as a function of the view angles. Angular maps of conversion efficiency are directly related to the magnetic pitch angle at the cutoff layer for the ordinary mode. Hence, measurements at various frequencies provide the safety factor profile at the plasma edge. Initial measurements and indications of the feasibility of the diagnostic are presented. Moreover, angular scans indicate the best launch conditions for EBW heating.

© 2010 American Institute of Physics

Article Outline

  1. INTRODUCTION AND PHYSICAL PRINCIPLE
  2. SELF-BALANCED SPINNING MIRROR
  3. EXPERIMENTAL RESULTS
  4. SUMMARY AND CONCLUSIONS

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KEYWORDS and PACS

Keywords

plasma Bernstein waves, plasma boundary layers, plasma diagnostics, plasma heating, plasma magnetohydrodynamics, plasma toroidal confinement, Tokamak devices

PACS

  • 52.25.Os

    Emission, absorption, and scattering of electromagnetic radiation

  • 52.35.Hr

    Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid)

  • 52.55.Fa

    Tokamaks, spherical tokamaks

  • 52.70.Kz

    Optical (ultraviolet, visible, infrared) measurements

  • 52.30.Cv

    Magnetohydrodynamics (including electron magnetohydrodynamics)

  • 52.40.Hf

    Plasma-material interactions; boundary layer effects

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3475786

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    F. M. Levinton, Rev. Sci. Instrum. 70, 810 (1999)RSINAK000070000001000810000001.

    B. W. Rice, D. G. Nilson, K. H. Burrell, and L. L. Lao, Rev. Sci. Instrum. 70, 815 (1999)RSINAK000070000001000815000001.

    D. M. Thomas, A. W. Leonard, L. L. Lao, T. H. Osborne, H. W. Mueller, and D. F. Finkenthal, Phys. Rev. Lett. 93, 065003 (2004).

    D. M. Thomas, Rev. Sci. Instrum. 74, 1541 (2003)RSINAK000074000003001541000001.

    G. A. Hallock, J. Mathew, W. C. Jennings, R. L. Hickok, A. J. Wootton, and R. C. Isler, Phys. Rev. Lett. 56, 1248 (1986).

    H. Soltwisch, Rev. Sci. Instrum. 59, 1599 (1988)RSINAK000059000008001599000001.

    K. Tritz, R. Fonck, M. Reinke, and G. Winz, Rev. Sci. Instrum. 74, 2161 (2003)RSINAK000074000003002161000001.

    H. Laqua, V. Erckmann, H. J. Hartfuß, H. Laqua, and W7-AS Team ECRH Group, Phys. Rev. Lett. 78, 3467 (1997).

    H. Laqua, H. J. Hartfuß, and W7-AS Team, Phys. Rev. Lett. 81, 2060 (1998).

    R. Cairns and C. Lashmore-Davies, Phys. Plasmas 7, 4126 (2000)PHPAEN000007000010004126000001.


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