Polarizer design for millimeter-wave plasma diagnostics

Frank Leipold, Mirko Salewski, Asger Schou Jacobsen, Martin Jessen, Søren Bang Korsholm, Poul Michelsen, Stefan Kragh Nielsen, Morten Stejner Pedersen

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Radiation from magnetized plasmas is in general elliptically polarized. In order to convert the elliptical polarization to linear polarization, mirrors with grooved surfaces are currently employed in our collective Thomson scattering diagnostic at ASDEX Upgrade. If these mirrors can be substituted by birefringent windows, the microwave receivers can be designed to be more compact at lower cost. Sapphire windows (a-cut) as well as grooved high density polyethylene windows can serve this purpose. The sapphire window can be designed such that the calculated transmission of the wave energy is better than 99%, and that of the high density polyethylene can be better than 97%.
Original languageEnglish
JournalReview of Scientific Instruments
Issue number8
Pages (from-to)084701
Publication statusPublished - 2013

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