Fast Ion Loss and Radial Electric Field in High-Aspect-Ratio Stellarator

概要

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Theoretical model is dex'eloped to detern?ine tlte radi;tl electric field axad tlte fast loutloss simultauteously in stellarators, and is appliecl to tlte Wendelstein Vll-Astellarator. The predi?xted value of tlae radial electric field is ntore closer to experimeuats tltan the purely neoclassical calculatioma. Tl?e loss rate, wlticlt is deterntiutedsimultaneously, is in tlte range of experimeuvtal observtttioxts. TIIC partition of tlte inj action energy by the bulk heating, direct orbit loss ancl slaine tltrouglt is estimated byusing tlte selfconsistent electric field profile. Tlae orbit loss beconaes noticeable as tlteiuajection energy increases. The influence of the raevutral )oarticles is also studied.Neutral particles C11l18I1CCl the uaegative radial electric field, axad reduce the direct orb?tloss by the expense of tlve charge excltange loss. Tlte imjcact of tlte increased radialelectric field on tlve uaec>classical Ton therunal energy loses is compared to tlte direct lossof fast ions. Tlae reduction of tlae xteoclassical loss is m?ach smaller than the orbit loss.
社団法人日本物理学会の論文
1992-07-15