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Nuclear Fusion Volume 34 Number 4 Create an alert RSS this journal

N. Hosogane et al 1994 Nucl. Fusion 34 527 doi:10.1088/0029-5515/34/4/I06

Influence of ripple loss particles on bolometric measurements of divertor radiation loss in JT-60U

N. Hosogane, K. Tobita, A.A.E. van Blokland, H. Kubo, N. Asakura, S. Tsuji and M. Shimada

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Abstract References Cited By

LETTER

In JT-60, it has been found that the measurements of divertor radiation loss are subject to large errors (sometimes exceeding 100%) due to the charge exchange neutral particles generated in the ripple loss process. This phenomenon occurs only in the neutral beam heated discharges performed under the condition that the direction of the ion ∇B drift is towards the divertor and the neutral beam heating contains the perpendicular beam component. This influence is strong as the safety factor is large because both the ripple loss fraction and the neutral particle pressure near the divertor, as a target of charge exchange events, increase with the safety factor. The quantitative relationship between the bolometric measurements and the charge exchange loss is discussed, and the charge exchange loss, with about 10% or less of the ripple loss, is found to affect the bolometric measurements of the radiation loss. A method of avoiding this influence on the bolometric measurements is presented on the basis of the experimental results

PACS

52.55.Fa Tokamaks, spherical tokamaks

52.70.-m Plasma diagnostic techniques and instrumentation

52.55.Rk Power exhaust; divertors

28.52.Nh Safety

52.25.Ya Neutrals in plasmas

Subjects

Nuclear physics

Instrumentation and measurement

Plasma physics

Dates

Issue 4 (April 1994)



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