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SUMMARY:Coherence imaging for plasma  spectro-polarimetry
DTSTART:20190322T103000
DTEND:20190322T113000
DTSTAMP:20260511T062057Z
UID:24c7e8181c3b9f21f3284624f469f05c6b763dc7ab4f56b2479edc6c
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. John Howard\, Australian National University\, Canberra\
 nOptical coherence imaging (CI) systems developed at ANU are compact polar
 ization-interferometers that facilitate 2D time-resolved imaging of simple
  plasma spectroscopic scenes. These systems simultaneously analyse the spe
 ctrum and polarization properties of relatively narrow-band spectral scene
 s (transmitted by an optical interference pre-filter) such as Doppler broa
 dened emission lines or polarized multiplets. The physical parameters dete
 rmining the emission spectral and polarization properties are recovered fr
 om the interferometric phase and amplitude images at one or more appropria
 tely chosen optical path length delays.\nCI has been used successfully for
  Doppler imaging studies of boundary and divertor flows and temperatures i
 n a number of tokamaks around the world\, and a system is now being prepar
 ed for installation on ITER. By combining with a suitable front-end polari
 meter\, CI systems have also been used for imaging the motional Stark effe
 ct polarization orientation (IMSE) in KSTAR\, DIII-D and ASDEX-U. Other ap
 plications include synchronous Doppler imaging of plasma instabilities and
  RMP islands\, imaging of spectral line ratios for isotope relative abunda
 nces and Thomson scattering.\nIn this presentation I will describe the opt
 ical principles underpinning these interferometric systems and will review
  Doppler and IMSE results obtained on a number of devices. In particular I
  will discuss the particular challenges faced by the ITER CI system\, incl
 uding large Zeeman effect and high stray background radiation. I will then
  consider possible applications for CI systems on the TCV tokamak.
LOCATION:PPB 019 https://plan.epfl.ch/?room=PPB019
STATUS:CONFIRMED
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