Effects of orbit squeezing on ion transport processes close to magnetic axis

Technical Report · Wed Jan 01 00:00:00 EST 1997

DOI:https://doi.org/10.2172/468587· OSTI ID:468587

Shaing, K C; Hazeltine, R D ^[1]; Zarnstorff, M C ^[2]

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1. Texas Univ., Austin, TX (United States). Inst. for Fusion Studies
2. Princeton Univ., NJ (United States). Plasma Physics Lab.

It is shown that ion thermal conductivity close to the magnetic axis in tokamaks is reduced by a factor of {vert_bar}S{vert_bar}{sup 5/3} if (M{sub i}/M{sub e}){sup 2/3}(T{sub e}/T{sub i}){sup 4/3}/{vert_bar}S{vert_bar}{sup 5/3} {much_gt} 1. Here, S is the orbit squeezing factor, M{sub i}(M{sub e}) is the ion (electron) mass, and T{sub i}(Te{sub e}) is the ion (electron) temperature. The reduction reflects both the increase of the fraction of trapped particles by a factor of {vert_bar}S{vert_bar}{sup 1/3}, and the decrease of the orbit size in units of the poloidal flux {psi} by a factor of {vert_bar}S{vert_bar}{sup 2/3}.

• Research Organization: Univ. of Texas, Austin, TX (United States). Institute for Fusion Studies; Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: FG03-96ER54346; AC02-76CH03073
• OSTI ID: 468587
• Report Number(s): DOE/ER/54346-778; IFSR-778; ON: DE97005274; TRN: 97:010132
• Resource Relation: Other Information: PBD: Jan 1997
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION
CHARGED-PARTICLE TRANSPORT
TOKAMAK DEVICES
ORBITS
PLASMA DRIFT
HEAT FLUX
MAGNETIC FIELD CONFIGURATIONS