4. 加速器系の開発(<小特集>国際核融合材料照射施設(IFMIF)の設計と開発の現状)

概要

論文の詳細を見る
Ion sources for the International Fusion Materials Irradiation Facility (IFMIF) are developed. Two types of ion sources, a multi-cusp ion source and an ECR ion source have been compared for beam characteristics. A 90% proton ratio was produced in both ion sources. Beam emittance of the ECR source was slightly larger than that of the multi-cusp source. However, threefold higher power efficiency was obtained at lower operating pressure in the ECR source. For the RFQ linac, an RF-Input coupler with a multi-loop antenna using co-axial waveguides has been developed. In the case of using a multi-loop antenna, the antenna structure affects phase difference and power balance in each cavity. A mock-up loop antenna using a pipe diameter of 10 mm has been fabricated, and phase differences and power balances were measured by means of a low-power test. It was found that the installation depth has to be shortened by 3 cm in order to make phase the differences small. In the multi-loop antenna tests, an even power balance using a four-loop antenna was obtained in comparison with those using a single loop and two-loop antennas.
社団法人プラズマ・核融合学会の論文
2006-01-25