Scattering of radio frequency waves by cylindrical filaments with general orientation relative to the magnetic field

Valvis, S. I.; Ram, A. K.; Hizanidis, K.; Papagiannis, P.; Papadopoulos, A.; Zisis, A.; Tigelis, I. G.; Glytsis, E.

doi:10.1017/s0022377818001083

Scattering of radio frequency waves by cylindrical filaments with general orientation relative to the magnetic field

Journal Article · Tue Dec 18 00:00:00 EST 2018 · Journal of Plasma Physics

DOI:https://doi.org/10.1017/s0022377818001083· OSTI ID:1609002

Valvis, S. I. ^[1]; Ram, A. K. ^[2]; Hizanidis, K. ^[3]; Papagiannis, P. ^[3]; Papadopoulos, A. ^[3]; Zisis, A. ^[4]; Tigelis, I. G. ^[4]; Glytsis, E. ^[3]

National Technical University of Athens (Greece); OSTI
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
National Technical University of Athens (Greece)
National and Kapodistrian University of Athens (Greece)

We report Radio frequency (RF) waves are routinely used in tokamak fusion plasmas for plasma heating, current control, as well as in diagnostics. These waves are excited by antenna structures placed near the tokamak’s wall and they have to propagate through a turbulent layer known as the scrape-off layer, before reaching the core plasma (which is their target). This layer exhibits coherent density fluctuations in the form of filaments and blobs. The scattering processes of RF plane waves by a single filament is studied with the assumption that the filament has a cylindrical shape and infinite length. Furthermore, besides the major toroidal component of the externally imposed magnetic field, there is also a small poloidal magnetic field component. Considering also that the cylindrical filament’s axis is not necessarily aligned with the toroidal direction, the total magnetic field is in general neither aligned with the axis of the cylinder nor with the toroidal direction. The investigation concerns the case of electron cyclotron (EC) waves (of frequency $$f_0$$ = 170 GHz)for tokamak applications. The study covers a variety of density contrasts between the filament and the ambient plasma, different magnetic field inclinations with respect to the cylinder axis (for the same magnitude of magnetic induction B = 4.5T and a wide range of filament radii.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: Euratom research and training programme; USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FC02-01ER54648; FG02-91ER54109; FG02-99ER54525

OSTI ID:: 1609002

Report Number(s):: PSFC/JA-18-54; PII: S0022377818001083

Journal Information:: Journal of Plasma Physics, Journal Name: Journal of Plasma Physics Journal Issue: 6 Vol. 84; ISSN 0022-3778

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

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