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Design Scalings and Optimizations for Super-Conducting Large Helical Devices
http://hdl.handle.net/10655/2823
http://hdl.handle.net/10655/2823a26d70ca-c13c-4455-8d8f-3535b1dd3aff
Item type | 研究報告書 / Research Paper(1) | |||||
---|---|---|---|---|---|---|
公開日 | 2010-02-05 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Design Scalings and Optimizations for Super-Conducting Large Helical Devices | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | helical system | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | superconducting device | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | system optimization analysis | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_18ws | |||||
資源タイプ | research report | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
"Yamazaki, K.
× "Yamazaki, K.× Motojima, O.× Asao, M.× Fujiwara, M.× Iiyoshi, A." |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | "Scalings of plasma configurations and engineering device parameters for l=2 helical systems with continuous coils are derived from a wide range of computations. Using these scalings, typical optimized designs of heliotron/torsatron experimental devices with NbTi superconducting (SC) coils are obtained after maximizing a fusion product ntauT within both physics and engineering constraints. Optimization studies have been carried out for the next-generation Large Helical Device (LHD) having a major radius of ~ 4 m and magnetic field of ~ 4 Tesla, in which to demonstrate a divertor concept is one of key experiments. These studies clarified that higher gamma_c (helical coil pitch parameter) configurations (gamma_c is greater than or equal to1.25) with a larger plasma minor radius are not acceptable from the requirement of the clean divertor configuration. More compact lower-m systems (m is less than or equal to 8) are bounded by the equilibrium beta limit of the plasma and the stability limit of the SC coil current due to higher maximum magnetic field strength. Larger-aspect-ratio larger-m systems (m is greater than or equal 12, gamma_c ~1.2-1.3) with better neoclassical confinement properties are not effective because of a lower stability beta and a narrower clearance between the divertor layer and the wall. The divertor clearance becomes more severe in normal-conducting (NC) designs than in SC systems, and more than 5-second plasma operations are not possible. An l=2/m=10/gamma=1.2 SC system is found as one of optimized high ntauT configurations for 4m/4T next-generation experiments with respect to the high-beta requirement, the clean divertor installation, the SC coil engineering and the cost optimization." | |||||
書誌情報 |
en : Research Report NIFS-Series 発行日 1990-05-01 |
|||||
報告書番号 | ||||||
NIFS-030 | ||||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0915-633X |