Author: Shoichi YoshikawaPublisher:
ISBN:
Category :
Languages : en
Pages : 32
Book Description
Observation of Collisionless Electron Heating by Ion Cyclotron Waves
Author: Shoichi YoshikawaNuclear Science Abstracts
Author: Nuclear Science Abstracts
Author: Observation of Ion Cyclotron Waves in a Hot Plasma
Author: Myron F. UmanPublisher:
ISBN:
Category : Cyclotron resonance
Languages : en
Pages : 35
Book Description
Lower Hybrid Resonance Heating in a Hot Electron Plasma
Author: Philippe André RaimbaultPublisher:
ISBN:
Category :
Languages : en
Pages : 386
Book Description
Effects of Ion Collisions on Quasilinear Heating by the Current-Driven Ion Cyclotron Instability in the High Latitude Ionosphere
Author: P. SatyanarayanaPublisher:
ISBN:
Category :
Languages : en
Pages : 25
Book Description
Using an effective relaxation time model, the effects of ion-ion and ion-neutral collisions on quasilinear ion heating by the current-driven ion cyclotron instability in the high latitude ionosphere have been studied. For conditions typical of the high latitude lower (200-300 km) F-region ionosphere, it is found that the combined effects of ion-neutral and ion-ion collisions tend to isotropize (S(tet)/T(par) approx. 1) the perpendicular T(per) and parallel S(tet) ion temperatures on time scales on the order of several tens to hundreds of NO+ cyclotron periods for wave amplitudes e(phi)/T sub e = 0.2. Here, phi is the wave electrostatic potential, T(par) the electron temperature (in energy units), e is the electron charge. In addition, for the high latitude upper (600 km) F-region ionosphere it is found that stronger anisotropy (T(per)/T(par)> 3) can be sustained even in the presence of ion collisions with waves with amplitudes e(phi)/T sub e = 0.2. For larger amplitude waves e(phi)/T sub e = 0.4, we find that the heating is weakly anisotropic at low altitudes (200-300 km) and strongly anisotropic at higher (600 km) altitudes. In both wave amplitude regimes (0.2 and 0.4), we find perpendicular ion heating factors about 2-10 for altitudes in the range 300-600km, with the larger perpendicular heating occurring at higher altitudes and larger wave amplitudes. The results are compared with recent rocket and satellite observations in the high latitude ionosphere. Keywords: Ion cyclotron instability; Ion heating. (jhd).
Proceedings of the Workshop on the Current-Driven Electrostatic Ion-Cyclotron Instability, July 9/10, 1987, Innsbruck, Austria
Author: R. SchrittwieserPublisher: World Scientific Publishing Company
ISBN:
Category : Science
Languages : en
Pages : 188
Book Description
Ion Cyclotron Range of Frequencies Mode Conversion Electron Heating in Deuterium-hydrogen Plasmas in the Alcator C-Mod Tokamak
Author: Yijun LinPublisher:
ISBN:
Category :
Languages : en
Pages : 52
Book Description
Localized direct electron heating by mode-converted ion cyclotron range of frequencies (ICRF) waves in D(H) tokamak plasmas has been clearly observed for the first time in Alcator C-Mod. Both on- and off-axis (high field side) mode conversion electron heating (MCEH) have been observed. The MCEH profile was obtained from a break in slope analysis of electron temperature signals in the presence of rf (radio frequency) shut-off. The temperature was measured by a 32-channel high spatial resolution (7 mm) 2nd harmonic heterodyne electron cyclotron emission (ECE) system. The experimental profiles were compared with the predictions from a toroidal full-wave ICRF code TORIC. Using the hydrogen concentration measured by a high-resolution optical spectrometer, TORIC predictions were shown qualitatively in agreement with the experimental results for both on- and off-axis MC cases. From the simulations, the electron heating from mode converted ion cyclotron wave (ICW) and ion Bernstein wave (IBW) is examined.
Cyclotron Waves in Plasma
Author: D. G. LominadzePublisher: Elsevier
ISBN: 1483280780
Category : Science
Languages : en
Pages : 219
Book Description
Cyclotron Waves in Plasma is a four-chapter text that covers the basic physical concepts of the theory of cyclotron waves and cyclotron instabilities, brought about by the existence of steady or alternating plasma currents flowing perpendicular to the magnetic field. This book considers first a wide range of questions associated with the linear theory of cyclotron oscillations in equilibrium plasmas and in electron plasmas in metals and semiconductors. The next chapter deals with the parametric excitation of electron cyclotron oscillations in plasma in an alternating electric field. A chapter focuses on plasma turbulence, which results from the development of cyclotron instabilities. The last chapter discusses pertinent experimental data concerning cyclotron waves in plasma. The book is intended for specialists in plasma physics and a number of related fields, including the physics of the ionosphere, solar wind and, metals, as well as for students and teachers who are specializing in these subjects.
Ec-9: Proceedings Of The Ninth Joint Workshop On Electron Cyclotron Emission And Electron Cyclotron Heating
Author: John LohrPublisher: World Scientific
ISBN: 9814548979
Category :
Languages : en
Pages : 678
Book Description
The conference proceedings will include the papers of approximately 50 key specialists from most of the world's major fusion laboratories, including the European Community, the U.S., Russia and the PRC. The unifying themes are the emission of electron cyclotron waves by high temperature plasmas and the reciprocal process, absorption, which can be used for heating, non inductive current drive and diagnostic purposes.