Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 34
Book Description
Ion Cyclotron Emission from Fusion Products and Beam Ions in the Tokamak Fusion Test Reactor
Interpretation of Ion Cyclotron Emission from Sub-Alfvénic Fusion Products in the Tokamak Fusion Test Reactor
Author: Publisher:
ISBN:
Category : Magnetohydrodynamic waves
Languages : en
Pages : 19
Book Description
Ion Cyclotron Emission Due to Collective Instability of Fusion Products and Beam Ions in TFTR and JET.
Author: R. O. DendyPublisher:
ISBN:
Category : Plasma (Ionized gases)
Languages : en
Pages : 11
Book Description
A Mechanism for Beam-driven Excitation of Ion Cyclotron Harmonic Waves in the Tokamak Fusion Test Reactor
Author: Ion Cyclotron Transmission Spectroscopy in the Tokamak Fusion Test Reactor
Author: G. J. GreenePublisher:
ISBN:
Category : Tokamak Fusion Test Reactor (Project)
Languages : en
Pages : 52
Book Description
A MECHANISM FOR BEAM-DRIVEN EXCITATION OF ION CYCLOTRON HARMONIC WAVES INTHE TOKAMAK FUSION TEST REACTOR.
Author: R. O. DendyIon Cyclotron Emission Due to the Newly-born Fusion Products Induced Fast Alfven Wave Radiative Instabilities in Tokamaks
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 40
Book Description
The velocity distribution functions of the newly born (t = 0) charged fusion products of tokamak discharges can be approximated by a monoenergetic ring distribution with a finite v{sub {parallel}} such that v{sub {perpendicular}} ≈ v{sub {parallel}} ≈ v{sub j} where (M{sub j}V{sub j}2/2) = E{sub j}, the directed birth energy of the charged fusion product species j of mass M{sub j}. As the time t progresses these distribution functions will evolve into a Gaussian in velocity with thermal spreadings given by the perpendicular and parallel temperatures T{sub {perpendicular}j}(t) = T{sub {parallel}j}(t) with T{sub j}(t) increasing as t increases and finally reaches an isotropic saturation value of T{sub {perpendicular}j}(t ≈ [tau]{sub j}) = T{sub {parallel}j}(t ≈ [tau]{sub j}) = T{sub j}(t ≈ [tau]{sub j}) ≈ [M{sub j}T{sub d}E{sub j}/(M{sub j} + M)]12, where T{sub d} is the temperature of the background deuterium plasma ions, M is the mass of a triton or a neutron for j = protons and alpha particles, respectively, and [tau]{sub j} ≈ [tau]{sub sj}/4 is the thermalization time of the fusion product species j in the background deuterium plasma and [tau]{sub sj} is the slowing-down time. For times t of the order of [tau]{sub j} their distributions can be approximated by a Gaussian in their total energy. Then for times t ≥ [tau]{sub sj} the velocity distributions of these fusion products will relax towards their appropriate slowing-down distributions. Here the authors will examine the radiative stability of all these distributions. The ion cyclotron emission from energetic ion produced by fusion reactions or neutral beam injection promises to be a useful diagnostic tool.
Ion Cyclotron Range of Frequency Heating on the Tokamak Fusion Test Reactor
Author: D. W. JohnsonPublisher:
ISBN:
Category : Tokamak Fusion Test Reactor (Project).
Languages : en
Pages : 24
Book Description
Ion Cyclotron and Spin-flip Emissions from Fusion Products in Tokamaks
Author: V. ArunasalamPublisher:
ISBN:
Category : Magnetohydrodynamic waves
Languages : en
Pages : 75
Book Description
Ion Cyclotron and Spin-flip Emissions from Fusion Products in Tokamaks
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 76
Book Description
Power emission by fusion products of tokamak plasmas in their ion cyclotron range of frequencies (ICRF) and at their spin-flip resonance frequency is calculated for some specific model fusion product velocity-space distribution functions. The background plasma of say deuterium (D) is assumed to be in equilibrium with a Maxwellian distribution both for the electrons and ions. The fusion product velocity distributions analyzed here are: (1) A monoenergetic velocity space ring distribution. (2) A monoenergetic velocity space spherical shell distribution. (3) An anisotropic Maxwellian distribution with T [perpendicular] [ne] T[parallel]and with appreciable drift velocity along the confining magnetic field. Single dressed'' test particle spontaneous emission calculations are presented first and the radiation temperature for ion cyclotron emission (ICE) is analyzed both for black-body emission and nonequilibrium conditions. Thresholds for instability and overstability conditions are then examined and quasilinear and nonlinear theories of the electromagnetic ion cyclotron modes are discussed. Distinctions between kinetic or causal instabilities'' and hydrodynamic instabilities'' are drawn and some numerical estimates are presented for typical tokamak parameters. Semiquantitative remarks are offered on wave accessibility, mode conversion, and parametric decay instabilities as possible for spatially localized ICE. Calculations are carried out both for k[parallel] = 0 for k[parallel] [ne] 0. The effects of the temperature anisotropy and large drift velocities in the parallel direction are also examined. Finally, proton spin-flip resonance emission and absorption calculations are also presented both for thermal equilibrium conditions and for an inverted'' population of states.