Results 161 to 170 of about 3,836 (196)

Electron Cyclotron Emission Imaging of Electron Cyclotron Resonance Ion Source Plasmas

2022
A new imaging system for Electron Cyclotron Resonance Ion Sources (ECRIS) has been designed and is being built. This K- and Ka-band camera will extract localized measurements of absolute energy and relative number density for ECRIS plasma electrons by imaging their Electron Cyclotron Emission (ECE) spectra, as the frequency, shape, and strength of the ...
Henderson, Lawrence, Clark, Henry, Gagliardi, Carl, May, Donald   +3 more
openaire   +1 more source

On ion cyclotron emission in toroidal plasmas

Nuclear Fusion, 2006
A detailed study of ion cyclotron interactions in a toroidal plasma has been carried out in order to elucidate the role of toroidal effects on ion cyclotron emission. It is well known that non-relaxed distribution functions can give rise to excitation of magnetosonic waves by ion cyclotron interactions when the distribution function increases with ...
T Hellsten, K Holmström, T Johnson, T Bergkvist, M Laxåback   +4 more
openaire   +1 more source

Origin of superthermal ion cyclotron emission in tokamaks

Nuclear Fusion, 1997
It is shown that the key mechanism in the origin of superthermal ion cyclotron emission (ICE) appearing in tokamak fusion experiments is the instability of fast magnetoacoustic waves having very small longitudinal wavenumbers and being excited through toroidicity affected cyclotron resonance with an energetic ion population.
T Fulop, Ya.I Kolesnichenko, M Lisak, D Anderson   +3 more
openaire   +1 more source

Ion cyclotron emission driven by axis-encircling energetic ions

Physics of Plasmas, 2019
Due to the large gyro-radius, most of the confined fusion products in modern medium-size tokamaks and beam ions in small tokamaks encircle the magnetic axis during the significant part of the drift orbit. As a result, a specific population of particles arises, which is characterized by strong density peaking due to equilibrium distribution in velocity ...
V. S. Marchenko, S. N. Reznik
openaire   +1 more source

Mode structure measurements of ion cyclotron emission and sub-cyclotron modes on DIII-D

Nuclear Fusion, 2022
Abstract We report mode structure measurements of coherent ion cyclotron emission (ICE) and sub-cyclotron modes on DIII-D. Through a dedicated experiment, we aimed to characterize a variety of modes via the upgraded ICE diagnostic in both L- and H-mode plasmas.
G.H. DeGrandchamp, J.B. Lestz, M.A. Van Zeeland, X.D. Du, W.W. Heidbrink, K.E. Thome, N.A. Crocker, R.I. Pinsker   +7 more
openaire   +1 more source

Linear and nonlinear physics of the magnetoacoustic cyclotron instability of fusion-born ions in relation to ion cyclotron emission

Physics of Plasmas, 2014
The magnetoacoustic cyclotron instability (MCI) probably underlies observations of ion cyclotron emission (ICE) from energetic ion populations in tokamak plasmas, including fusion-born alpha-particles in JET and TFTR [Dendy et al., Nucl. Fusion 35, 1733 (1995)].
Carbajal, L., Dendy, R., Chapman, S., Cook, J.   +3 more
openaire   +2 more sources

Characterization of the fast ions distribution from ion cyclotron emission measurements

AIP Conference Proceedings, 2014
The ion cyclotron emission (ICE) is triggered by the free energy from an anisotropic distribution of fast ions in cyclotron resonance with plasma waves. Several theories have been developed in the hope of using the spectrum featured by this emission to extract information on the fast ion population [3], but the strong coupling between the fast ions ...
R. D'Inca, J-M. Noterdaeme, null ASDEX Upgrade Team   +2 more
openaire   +2 more sources

Sawtooth oscillations in ion cyclotron emission from JET

Nuclear Fusion, 1989
During ohmically heated high current deuterium discharges in JET, inverted sawtooth oscillations in the superthermal ion cyclotron emission (ICE) have been detected which cannot be accounted for by fluctuations in the antenna-plasma coupling efficiency.
P. Schild, G.A. Cottrell, R.O. Dendy
openaire   +1 more source

Generation and amplification of HM emissions by ion-cyclotron instabilities

Astrophysics and Space Science, 1973
This paper describes the analysis of the growth rate of hydromagnetic waves in the magnetosphere in ion-cyclotron mode considering multicomponent thermal plasma. Effects upon growth rate have been estimated due to (a) Thermal velocity of background plasma; (b) Presence of Heliumions in background plasma; (c) Beam Velocity; (d) Beam density.
S. N. Singh, R. Y. Prasad
openaire   +1 more source

Ion cyclotron emission on ASDEX upgrade

2014
This works deals with the Ion Cyclotron Emission (ICE), a plasma instability that takes place both in astrophysical plasmas and in fusion energy facilities like Tokamaks and Stellarators, when a population of high energetic ions is present. These fast ions can interact with the waves which propagate in the background thermal plasma and excite ...
openaire   +1 more source