NBCD code benchmark

Oikawa, Toshihiro

The author has been leading a neutral beam current drive code benchmark in the ITPA IOS topical group frame. Presently, OFMC, NUBEAM, SPOT, ACCOME and ASTRA have been compared. The NB fast ion source profile agrees well among the codes. The heating profile generally agrees, but there is visible discrepancy. This is considerted to result from finite orbit width effects. Large differenence is observed in the NBCD profile. OFMC and ACCOME calculates the initial pitch angle of a fast ion against the toroidal magnetic field, which should correctly be against the equilibrium field. By correcting this the difference is expected to be resolved to some degree. ASTRA's deviation from other codes results from its too simplified NBI geometry and a Fokker-Planck equation derived for a cylinder plasma being used, which does not accordingly include toroidal effects. Other codes such as CQL3D, ASCOT and TRANSP are going to submit results soon. The author will discuss on how to proceed the benchmark.

Language	:	English
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Meeting title	:	ITPA 1st Integrated Operation Scenario Topical Group Meeting
Held date	:	2008/10
Location (city)	:	Lausanne
Location (country)	:	Switzerland
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Keywords	:	no keyword
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Registration No. : BB20082429
JAEA Abstracts No. :
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