Results 181 to 190 of about 30,961 (212)

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 measurements during JET deuterium-tritium experiments

Nuclear Fusion, 1993
In the course of the Preliminary Tritium Experiment in JET, where combined deuterium and tritium neutral beam injection generated a DT fusion power of 1.7 MW, ion cyclotron emission (ICE) was measured in the frequency range v ≤ 180 MHz. The ICE spectra contain superthermal, narrow, equally spaced emission lines, which correspond to successive cyclotron
G.A Cottrell, V.P Bhatnagar, O. Da Costa, R.O Dendy, J Jacquinot, K.G McClements, D.C McCune, M.F.F Nave, P Smeulders, D.F.H Start   +9 more
openaire   +1 more source

Properties of quasi-periodical emission of electromagnetic ion cyclotron waves

2022
<p>Energetic electron scattering by electromagnetic ion cyclotron (EMIC) waves is one of the most effective mechanisms of electrons losses in the inner magnetosphere. Such resonant scattering has been traditionally considered as a controlling process for the dynamics of relativistic electron fluxes in the Earth’s radiation ...
Muhammad Shahid, M. Fraz Bashir, Anton Artemyev, Xiaojia Zhang, Vassilis Angelopoulos, Ghulam Murtaza   +5 more
openaire   +1 more source

Upgrades to the ion cyclotron emission diagnostic on the DIII-D tokamak

Review of Scientific Instruments, 2021
The ion cyclotron emission diagnostic on the DIII-D tokamak comprises seven single-turn loops that measure high-frequency (1–100 MHz) magnetic field fluctuations that are often excited by energetic particles in the plasma. The raw voltage signals induced in the loops in response to these fluctuations travel through a series of cables, isolation ...
G. H. DeGrandchamp, K. E. Thome, W. W. Heidbrink, I. Holmes, R. I. Pinsker   +4 more
openaire   +2 more sources

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

Ion cyclotron wave emission at the quasi‐perpendicular bow shock

Journal of Geophysical Research: Space Physics, 1993
The power spectra of magnetic fluctuations occurring close to the ramp of the quasi‐perpendicular, low‐β bow shock indicate the presence of obliquely propagating electromagnetic waves with frequencies above the ion cyclotron frequency, Ωi. These waves appear to be associated with ion distributions consisting of a bi‐Maxwellian core and an energetic ...
R. O. Dendy, K. G. McClements
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

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
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Interpretation of ion cyclotron emission from fusion and space plasmas

Plasma Physics and Controlled Fusion, 1994
Superthermal ion cyclotron emission (ICE) is observed in both fusion and space plasmas. Typical spectra display strong peaks at sequential multiple ion cyclotron harmonics, and distinct energetic ion populations are present in the emitting regions. In JET and TFTR, for example, ICE appears to be driven by fusion products or by injected beam ions in the
openaire   +1 more source

Chirping ion cyclotron emission (ICE) on NSTX-U

Nuclear Fusion, 2021
E.D. Fredrickson, N.N. Gorelenkov, R.E. Bell, A. Diallo, B.P. LeBlanc, J. Lestz, M. Podestà, null the NSTX team   +7 more
openaire   +1 more source