Study of High Temperature Damages for The Carbon Stripper Foil by Irradiation of High Current Negative Hydrogen Ion Beams

为解决高强度粒子加速器寿命短的问题，对碳汽提箔的高温损伤进行了研究。实验结果总结如下：(1)采用大电流去负离子束，实现了2500K以上的极高温度条件。(2)在2000K左右的高温条件下，研究了损伤(变形增长、厚度减小、针孔形成)。(3)在200h的机器时间内，用大电流650keV氢离子束进行辐照。(4)对几种材料作为剥离箔进行了比较：(A)商用碳箔(B)新开发的KEK混合型碳箔(C)SnS金刚石箔(D)商用金刚石箔。

The high temperature damage about carbon stripper foils has been studied to resolve the short lifetime problem on the high intensity particle accelerators,. This study has been realized hybrid type carbon stripper foils with high durability over 2000K.Results from the experiment are summarized blow.(1) By using the high current de negative ion beam, the very high temperature condition of over 2500K was realized.(2) The damages (growth of distortion, reduced thickness, formation of pin-hole) were studied with high temperature of around 2000K.(3) The irradiation by high current 650keV H-ion beam were executed with stable beam condition during the machine time of 200hours. And the hybrid type carbon stripper foil showed the long lifetime with over 1500K.(4) Comparison of several materials as stripper foil was carried out; (a) Commercially available carbon foil (b) Newly developed KEK hybrid type carbon foil (c) SNS diamond foil (d) Commercially available diamond foil.