Lower Hybrid Wavepacket Stochasticity Revisited

0436122 - ÚFP 2015 RIV US eng C - Conference Paper (international conference)
Fuchs, Vladimír - Laqua, H.P. - Krlín, Ladislav - Pánek, Radomír - Preinhaelter, Josef - Seidl, Jakub - Urban, Jakub
Lower Hybrid Wavepacket Stochasticity Revisited.
AIP Conference Proceedings. Vol. 1580. Melville: American Institute of Physics, 2014, s. 442-445. AIP Publishing, 1580. ISBN 978-0-7354-1210-1. ISSN 0094-243X.
[Topical conference on radio frequency power in plasmas/20./. Sorrento (IT), 25.06.2013-28.06.2013]
Institutional support: RVO:61389021
Keywords : stellarator * lower hybrid * current drive * Hamiltonian * electron * stochastic
Subject RIV: BL - Plasma and Gas Discharge Physics
http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.4864583

Analysis is presented in support of the explanation in Ref. [1] for the observation of relativistic electrons during Lower Hybrid (LH) operation in EC pre-heated plasma at the WEGA stellarator [1,2]. LH power from the WEGA TE11 circular waveguide, 9 cm diameter, un-phased, 2.45 GHz antenna, is radiated into a B congruent to 0.5 T, (n(e)) over bar congruent to 5 x 10(17) 1/m(3) plasma at T-e congruent to 10 eV bulk temperature with an EC generated 50 keV component [1]. The fast electrons cycle around flux or drift surfaces with few collisions, sufficient for randomizing phases but insufficient for slowing fast electrons down, and thus repeatedly interact with the rf field close to the antenna mouth, gaining energy in the process.Our antenna calculations reveal a standing electric field pattern at the antenna mouth, with which we formulate the electron dynamics via a relativistic Hamiltonian.A simple approximation of the equations of motion leads to a relativistic generalization of the
Permanent Link: http://hdl.handle.net/11104/0239904