Effects of orbit squeezing on ion transport in the banana regime in tokamaks

K. C. Shaing; R. D. Hazeltine

doi:10.1063/1.860170

Effects of orbit squeezing on ion transport in the banana regime in tokamaks

K. C. Shaing, R. D. Hazeltine

Institute of Space and Plasma Sciences

Research output: Contribution to journal › Article › peer-review

67 Citations (Scopus)

Abstract

It is shown that ion transport in the banana regime in tokamaks is reduced in the presence of a strong shear in the radial electric field E_r, as is often observed in the edge region. For simplicity, the ordering with ρ_pi|d ln E_r/dr| ≫ 1 but c|E_r|/B _pυ_ti < 1 is adopted. Here, ρ_pi is the ion poloidal gyroradius, B_p is the poloidal magnetic field strength, υ_ti is the ion thermal speed, and c is the speed of light. A kinetic transport theory similar to those for bumpy tori and stellarators is developed to show that the ion thermal conductivity χ_i is reduced by a factor of roughly S^-3/2, where S = 1 - (ρ_pid ln E_r/dr) (cE_r/B _pυ_ti). The result reflects more than simple orbit squeezing: The fraction of trapped ions is also modified by S.

Original language	English
Pages (from-to)	2547-2551
Number of pages	5
Journal	Physics of Fluids B
Volume	4
Issue number	8
DOIs	https://doi.org/10.1063/1.860170
Publication status	Published - 1992

All Science Journal Classification (ASJC) codes

Computational Mechanics
Condensed Matter Physics
Mechanics of Materials
Physics and Astronomy(all)
Fluid Flow and Transfer Processes

Access to Document

10.1063/1.860170

Cite this

@article{98db685bdac04a5e9d2c85687651cfc3,

title = "Effects of orbit squeezing on ion transport in the banana regime in tokamaks",

abstract = "It is shown that ion transport in the banana regime in tokamaks is reduced in the presence of a strong shear in the radial electric field Er, as is often observed in the edge region. For simplicity, the ordering with ρpi|d ln Er/dr| ≫ 1 but c|Er|/B pυti < 1 is adopted. Here, ρpi is the ion poloidal gyroradius, Bp is the poloidal magnetic field strength, υti is the ion thermal speed, and c is the speed of light. A kinetic transport theory similar to those for bumpy tori and stellarators is developed to show that the ion thermal conductivity χi is reduced by a factor of roughly S-3/2, where S = 1 - (ρpid ln Er/dr) (cEr/B pυti). The result reflects more than simple orbit squeezing: The fraction of trapped ions is also modified by S.",

author = "Shaing, {K. C.} and Hazeltine, {R. D.}",

year = "1992",

doi = "10.1063/1.860170",

language = "English",

volume = "4",

pages = "2547--2551",

journal = "Physics of Fluids B",

issn = "0899-8221",

publisher = "American Institute of Physics Publising LLC",

number = "8",

}

TY - JOUR

T1 - Effects of orbit squeezing on ion transport in the banana regime in tokamaks

AU - Shaing, K. C.

AU - Hazeltine, R. D.

PY - 1992

Y1 - 1992

N2 - It is shown that ion transport in the banana regime in tokamaks is reduced in the presence of a strong shear in the radial electric field Er, as is often observed in the edge region. For simplicity, the ordering with ρpi|d ln Er/dr| ≫ 1 but c|Er|/B pυti < 1 is adopted. Here, ρpi is the ion poloidal gyroradius, Bp is the poloidal magnetic field strength, υti is the ion thermal speed, and c is the speed of light. A kinetic transport theory similar to those for bumpy tori and stellarators is developed to show that the ion thermal conductivity χi is reduced by a factor of roughly S-3/2, where S = 1 - (ρpid ln Er/dr) (cEr/B pυti). The result reflects more than simple orbit squeezing: The fraction of trapped ions is also modified by S.

AB - It is shown that ion transport in the banana regime in tokamaks is reduced in the presence of a strong shear in the radial electric field Er, as is often observed in the edge region. For simplicity, the ordering with ρpi|d ln Er/dr| ≫ 1 but c|Er|/B pυti < 1 is adopted. Here, ρpi is the ion poloidal gyroradius, Bp is the poloidal magnetic field strength, υti is the ion thermal speed, and c is the speed of light. A kinetic transport theory similar to those for bumpy tori and stellarators is developed to show that the ion thermal conductivity χi is reduced by a factor of roughly S-3/2, where S = 1 - (ρpid ln Er/dr) (cEr/B pυti). The result reflects more than simple orbit squeezing: The fraction of trapped ions is also modified by S.

UR - http://www.scopus.com/inward/record.url?scp=0000300580&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000300580&partnerID=8YFLogxK

U2 - 10.1063/1.860170

DO - 10.1063/1.860170

M3 - Article

AN - SCOPUS:0000300580

SN - 0899-8221

VL - 4

SP - 2547

EP - 2551

JO - Physics of Fluids B

JF - Physics of Fluids B

IS - 8

ER -

Effects of orbit squeezing on ion transport in the banana regime in tokamaks

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this