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Non-local effects of alpha particles on second-harmonic heating

Technical Report:

Abstract

A model based on the linearized Vlasov-Maxwell equations, taking into account the non-local interactions of particles due to their finite Larmor radii, has been developed. Assuming an inhomogeneous 1-D slab plasma, Maxwellian equilibrium distribution functions and k{sub y}=0, it leads to a system of one first-order and two second-order integro-differential equations for E{sub x} and E{sub y}, E{sub z} respectively. These equations are valid for arbitrary value of k/{rho}{sub {sigma}}, where k/{rho}{sub {sigma}} is the perpendicular wavenumber and {rho}{sub {sigma}} the Larmor radius of species {sigma}. Therefore, the code SEMAL, solving these equations, is well appropriate for studying the effects of alpha particles on the ion cyclotron range of frequency (ICRF) heating. These effects are shown to be much less significant for heating at the second harmonic of deuterium than expected from local models. Other heating scenarii of deuterium as well as the influence of k{sub z}, T{sub {alpha}}, non-Maxwellian distribution functions and n{sub {alpha}}/n{sub e} are also investigated. The results indicate under which conditions the power absorption by alpha particles start to dominate and, therefore, degrade the heating efficiency. (author) 10 figs., 10 refs.
Authors:
Sauter, O; Vaclavik, J [1] 
  1. Ecole Polytechnique Federale, Lausanne (Switzerland). Centre de Recherche en Physique des Plasma (CRPP)
Publication Date:
Aug 01, 1991
Product Type:
Technical Report
Report Number:
LRP-432/91
Reference Number:
SCA: 700350; PA: AIX-23:013693; SN: 92000639341
Resource Relation:
Other Information: PBD: Aug 1991
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALPHA PARTICLES; LARMOR RADIUS; ICR HEATING; HARMONICS; ABSORPTION; BERNSTEIN MODE; BOLTZMANN STATISTICS; COMPUTERIZED SIMULATION; DEUTERIUM; DIFFERENTIAL EQUATIONS; DISTRIBUTION FUNCTIONS; DISTURBANCES; EFFICIENCY; EQUILIBRIUM; INHOMOGENEOUS PLASMA; INTEGRAL EQUATIONS; INTERACTIONS; S CODES; THEORETICAL DATA; 700350; PLASMA PRODUCTION, HEATING, CURRENT DRIVE, AND INTERACTIONS
OSTI ID:
10111744
Research Organizations:
Ecole Polytechnique Federale, Lausanne (Switzerland). Centre de Recherche en Physique des Plasma (CRPP)
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Other: ON: DE92614479; TRN: CH9100590013693
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
CHN
Size:
35 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Sauter, O, and Vaclavik, J. Non-local effects of alpha particles on second-harmonic heating. Switzerland: N. p., 1991. Web.
Sauter, O, & Vaclavik, J. Non-local effects of alpha particles on second-harmonic heating. Switzerland.
Sauter, O, and Vaclavik, J. 1991. "Non-local effects of alpha particles on second-harmonic heating." Switzerland.
@misc{etde_10111744,
title = {Non-local effects of alpha particles on second-harmonic heating}
author = {Sauter, O, and Vaclavik, J}
abstractNote = {A model based on the linearized Vlasov-Maxwell equations, taking into account the non-local interactions of particles due to their finite Larmor radii, has been developed. Assuming an inhomogeneous 1-D slab plasma, Maxwellian equilibrium distribution functions and k{sub y}=0, it leads to a system of one first-order and two second-order integro-differential equations for E{sub x} and E{sub y}, E{sub z} respectively. These equations are valid for arbitrary value of k/{rho}{sub {sigma}}, where k/{rho}{sub {sigma}} is the perpendicular wavenumber and {rho}{sub {sigma}} the Larmor radius of species {sigma}. Therefore, the code SEMAL, solving these equations, is well appropriate for studying the effects of alpha particles on the ion cyclotron range of frequency (ICRF) heating. These effects are shown to be much less significant for heating at the second harmonic of deuterium than expected from local models. Other heating scenarii of deuterium as well as the influence of k{sub z}, T{sub {alpha}}, non-Maxwellian distribution functions and n{sub {alpha}}/n{sub e} are also investigated. The results indicate under which conditions the power absorption by alpha particles start to dominate and, therefore, degrade the heating efficiency. (author) 10 figs., 10 refs.}
place = {Switzerland}
year = {1991}
month = {Aug}
}