Page 17 - Schmitz-APS-DPP-2020-talk_5

Measure Electromagnetic Turbulence via Cross-Polarization Scattering (CPS):
~
§ CPS principle: Bq scatters launched X-mode
radiation into opposite polarization (O-mode) ~
§ Back-scattered O-mode amplitude is ~ Bq; can be separated/detected via polarizers
kI
ω,k kS kθ I I ζ
Polarizer
X-Mode
DBS Launch/ Receive
§ Assess importance of magnetic fluctuations for transport in the FRC core and SOL (wide wavenumber range (1 ≤ kperp rs ≤ 50)
§ CPS signal is ~ 7x smaller than DBS signal: within expectations CPS signal is well above noise level
O-Mode CPS receive ω =ω -k v
APS-DPP 2020 Presenter: Lothar Schmitz
17
s i θ ExB ks=ki-kθ