Energy channeling from energetic particles to bulk ions via beam-driven geodesic acoustic modes - GAM channeling

Makoto Sasaki, K. Itoh, Sanae Itoh

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

A novel mechanism for energy transfer from energetic particles to bulk ions via geodesic acoustic modes (GAMs) is presented. The mechanism involves the excitation of GAMs by energetic particles. The GAMs are damped on ions by the Landau damping, by which wave energy is given to bulk ions. This process of energy exchange is formulated within the framework of quasilinear theory. The rate of energy transfer from energetic particles to GAMs can be comparable to that of energy exchange to particles via collisions, if the E × B velocity of GAMs reaches the level of diamagnetic velocity. Under this circumstance, the partition of energy absorptions by bulk ions and electrons is substantially modified due to the selective ion heating by GAMs.

Original languageEnglish
Article number085017
JournalPlasma Physics and Controlled Fusion
Volume53
Issue number8
DOIs
Publication statusPublished - Aug 1 2011

Fingerprint

energetic particles
ion beams
acoustics
Ions
energy transfer
Energy transfer
ions
energy
Energy absorption
particle collisions
Landau damping
energy absorption
Ion exchange
Damping
partitions
Heating
Electrons
heating
excitation
electrons

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Energy channeling from energetic particles to bulk ions via beam-driven geodesic acoustic modes - GAM channeling. / Sasaki, Makoto; Itoh, K.; Itoh, Sanae.

In: Plasma Physics and Controlled Fusion, Vol. 53, No. 8, 085017, 01.08.2011.

Research output: Contribution to journalArticle

@article{319c1e7ee3dd4e47886d7609d713a3e7,
title = "Energy channeling from energetic particles to bulk ions via beam-driven geodesic acoustic modes - GAM channeling",
abstract = "A novel mechanism for energy transfer from energetic particles to bulk ions via geodesic acoustic modes (GAMs) is presented. The mechanism involves the excitation of GAMs by energetic particles. The GAMs are damped on ions by the Landau damping, by which wave energy is given to bulk ions. This process of energy exchange is formulated within the framework of quasilinear theory. The rate of energy transfer from energetic particles to GAMs can be comparable to that of energy exchange to particles via collisions, if the E × B velocity of GAMs reaches the level of diamagnetic velocity. Under this circumstance, the partition of energy absorptions by bulk ions and electrons is substantially modified due to the selective ion heating by GAMs.",
author = "Makoto Sasaki and K. Itoh and Sanae Itoh",
year = "2011",
month = "8",
day = "1",
doi = "10.1088/0741-3335/53/8/085017",
language = "English",
volume = "53",
journal = "Plasma Physics and Controlled Fusion",
issn = "0741-3335",
publisher = "IOP Publishing Ltd.",
number = "8",

}

TY - JOUR

T1 - Energy channeling from energetic particles to bulk ions via beam-driven geodesic acoustic modes - GAM channeling

AU - Sasaki, Makoto

AU - Itoh, K.

AU - Itoh, Sanae

PY - 2011/8/1

Y1 - 2011/8/1

N2 - A novel mechanism for energy transfer from energetic particles to bulk ions via geodesic acoustic modes (GAMs) is presented. The mechanism involves the excitation of GAMs by energetic particles. The GAMs are damped on ions by the Landau damping, by which wave energy is given to bulk ions. This process of energy exchange is formulated within the framework of quasilinear theory. The rate of energy transfer from energetic particles to GAMs can be comparable to that of energy exchange to particles via collisions, if the E × B velocity of GAMs reaches the level of diamagnetic velocity. Under this circumstance, the partition of energy absorptions by bulk ions and electrons is substantially modified due to the selective ion heating by GAMs.

AB - A novel mechanism for energy transfer from energetic particles to bulk ions via geodesic acoustic modes (GAMs) is presented. The mechanism involves the excitation of GAMs by energetic particles. The GAMs are damped on ions by the Landau damping, by which wave energy is given to bulk ions. This process of energy exchange is formulated within the framework of quasilinear theory. The rate of energy transfer from energetic particles to GAMs can be comparable to that of energy exchange to particles via collisions, if the E × B velocity of GAMs reaches the level of diamagnetic velocity. Under this circumstance, the partition of energy absorptions by bulk ions and electrons is substantially modified due to the selective ion heating by GAMs.

UR - http://www.scopus.com/inward/record.url?scp=79961060285&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79961060285&partnerID=8YFLogxK

U2 - 10.1088/0741-3335/53/8/085017

DO - 10.1088/0741-3335/53/8/085017

M3 - Article

VL - 53

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 8

M1 - 085017

ER -