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  BXO mode-converted electron Bernstein emission diagnostic (invited)

Volpe, F., Laqua, H. P., & W7-AS Team (2003). BXO mode-converted electron Bernstein emission diagnostic (invited). Review of Scientific Instruments, 74, 1409-1413. doi:10.1063/1.1530379.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-3B36-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-3B37-E
Genre: Journal Article

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 Creators:
Volpe, F.1, Author              
Laqua, H. P.2, Author              
W7-AS Team3, Author
Affiliations:
1Stellarator Optimisation (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856329              
2External Organizations, ou_persistent22              
3Max Planck Society, ou_persistent13              

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 Abstract: Electron temperature profiles at densities above the electron cyclotron emission (ECE) cutoff are measured at the W7-AS stellarator by a novel diagnostic based on black body emission and Bernstein-extraordinary-ordinary mode conversion of electron Bernstein waves (EBWs). The radiation is collected along a special oblique line of sight by an antenna with gaussian optics. This was optimized for maximal conversion efficiency and minimal Doppler broadening by means of EBW ray tracing calculations in full stellarator geometry. The elliptical O-mode polarization detected along the oblique line of sight is changed into a linear polarization by a broadband quarter wave shifter, namely an elliptical waveguide. The signal is spectrum analyzed by an heterodyne radiometer and temperature profiles are derived from spectra by means of ray tracing. The diagnostic was applied to measurements of edge-localized modes to illustrate its advantages in terms of spatial and temporal resolution. Moreover, for the first time, the heat wave propagation method for the determination of local heat transport coefficients was extended beyond the ECE cutoff density by combining EBW emission measurements at the first harmonic (f = 66–78 GHz) with modulated EBW heating at the second harmonic (140 GHz).

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Degree: -

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Title: Review of Scientific Instruments
  Alternative Title : Rev. Sci. Instrum.
Source Genre: Journal
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Publ. Info: Copyright © 2003 American Institute of Physics
Pages: - Volume / Issue: 74 Sequence Number: - Start / End Page: 1409 - 1413 Identifier: -