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Doppler Broadening and Magnetic Field Effects on the Balmer Lines Emitted at the Edge of a Tokamak Plasma
Author(s) -
Hey J. D.,
Korten M.,
Lie Y. T.,
Pospieszczyk A.,
Rusbüldt D.,
Schweer B.,
Unterberg B.,
Wienbeck J.,
Hintz E.
Publication year - 1996
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.2150360505
Subject(s) - tokamak , balmer series , doppler effect , plasma , magnetic field , physics , atomic physics , field line , doppler broadening , enhanced data rates for gsm evolution , spectral line , nuclear physics , emission spectrum , astronomy , telecommunications , quantum mechanics , computer science
Abstract Profiles of the Balmer lines D a ( H a ), D β ( H β ) and D γ ( H γ ) have been measured in the scrape‐off layer and within the edge of the TEXTOR (upgrade) plasma, under Ohmic conditions and with neutral‐beam injection. Each line profile shows a strong Zeeman effect in the vicinity of line centre, and a marked central dip when mainly the σ components are observed. The line core evidently originates from cold atoms in the edge plasma, excited in the course of molecular dissociation, while the broad pedestal on which the core rests is radiated by excited atoms produced through charge‐exchange recombination of deuterons (protons), transported outwards from the much hotter plasma interior, and by atoms heated directly by collisions with the deuterons (protons). Core temperatures of about 0.5 eV and less are obtained from line profile analysis.