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Absorption of lower hybrid waves by fast ions

Technical Report:

Abstract

The LHCD (Lower Hybrid Current Drive) at 3.7 GHz experiment, scheduled to be carried out with the JET (Joint European Torus), will test the ability of LH waves to reach the central region of a high temperature elongated plasma and, at the same time, will show to which extent fast ions absorb the LH power. Ion tails up to few MeV are generated and confined in the JET plasma during Ion Cyclotron Heating (ICH) experiments. Ions of such energy can interact with LH waves at 3.7 GHz at the JET working density. These ions are located in the region where the IC wave (ICW) power is deposited. If the interaction between fast ions and LH waves occurs and is detectable, the LHW deposition profile could be studied, by varying the ICW deposition profile, and the absorption capability of fast ions could be analyzed, thus allowing extrapolation to future devices. With this aim, a Fokker-Planck (FP) 1-D model (in the velocity space) of the LHW-ion interaction is considered. It includes both the quasi-linear (QL) LHW and ICW diffusion terms. This model is coupled to a deposition code for LHW to study the competition in the absorption between ions and electrons. The  More>>
Authors:
Publication Date:
Dec 31, 1991
Product Type:
Technical Report
Report Number:
ENEA-RT-NUCL-90-13; RT/NUCL-90-13
Reference Number:
SCA: 700340; 700460; PA: ITAN-91:002075; SN: 92000621813
Resource Relation:
Other Information: PBD: 1991
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; JET TOKAMAK; LOWER HYBRID HEATING; ICR HEATING; RESONANCE ABSORPTION; LOWER HYBRID CURRENT DRIVE; ION MOBILITY; ION DENSITY; VELOCITY; DEPOSITION; EXPERIMENT PLANNING; MATHEMATICAL MODELS; 700340; 700460; PLASMA WAVES, OSCILLATIONS, AND INSTABILITIES; HEATING AND FUELING SYSTEMS; FUELS
OSTI ID:
10107652
Research Organizations:
ENEA, Frascati (Italy). Dipt. Fusione
Country of Origin:
Italy
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0393-6287; Other: ON: DE92744004; TRN: 91:002075
Availability:
OSTI; NTIS (US Sales Only)
Submitting Site:
ITAN
Size:
11 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Barbato, E. Absorption of lower hybrid waves by fast ions. Italy: N. p., 1991. Web.
Barbato, E. Absorption of lower hybrid waves by fast ions. Italy.
Barbato, E. 1991. "Absorption of lower hybrid waves by fast ions." Italy.
@misc{etde_10107652,
title = {Absorption of lower hybrid waves by fast ions}
author = {Barbato, E}
abstractNote = {The LHCD (Lower Hybrid Current Drive) at 3.7 GHz experiment, scheduled to be carried out with the JET (Joint European Torus), will test the ability of LH waves to reach the central region of a high temperature elongated plasma and, at the same time, will show to which extent fast ions absorb the LH power. Ion tails up to few MeV are generated and confined in the JET plasma during Ion Cyclotron Heating (ICH) experiments. Ions of such energy can interact with LH waves at 3.7 GHz at the JET working density. These ions are located in the region where the IC wave (ICW) power is deposited. If the interaction between fast ions and LH waves occurs and is detectable, the LHW deposition profile could be studied, by varying the ICW deposition profile, and the absorption capability of fast ions could be analyzed, thus allowing extrapolation to future devices. With this aim, a Fokker-Planck (FP) 1-D model (in the velocity space) of the LHW-ion interaction is considered. It includes both the quasi-linear (QL) LHW and ICW diffusion terms. This model is coupled to a deposition code for LHW to study the competition in the absorption between ions and electrons. The maximum absorption capability by the minority ions is found by varying the plasma parameters, the minority concentration, and mass and the RF power levels.}
place = {Italy}
year = {1991}
month = {Dec}
}