Abstract
Runaway of the reflectometer output phase can be produced by transversely propagating density fluctuations if the antenna system is operated in the tilt-mode, i.e. away from perpendicular incidence. The observed characteristics of the phase runaway are explained with an analytical model. The two-dimensional (2D) effects resulting from poloidally propagating density fluctuations are calculated using a time-independent full-wave 2D code. Numerical simulations for both monochromatic and turbulent density fluctuations are presented. Good agreement with the characteristics of phase runaway measured with reflectometry in the W7-AS stellarator is obtained. The potential of a reflectometer in the tilt-mode to measure the radially resolved poloidal propagation velocity of density fluctuations is analysed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
