Development of long-lived thick Carbon Stripper Foils by Pulsed laser Ablation and Application to Accelerator

本课题的主要目的是研制脉冲激光等离子体烧蚀装置，并测量其制备的厚碳剥离箔的寿命。测定了箔片的蒸发速率和厚度均匀性，找到了防止箔片在剥离过程中卷曲的加热方法。利用东京工业大学Van dee Graff加速器的3.5mmphi点3.2MeV,1-3muA,^<20>Ne^+束流，对100-250mug/cm^2的厚箔进行了寿命测量。其平均寿命为80mC/cm^2，相当于市售箔寿命的6倍。

A main purpose of this project has been completed to make the apparatus for the pulsed laser plasma ablation and to measure the lifetime of the thick carbon stripper foils made by using it.We have also measured the evaporation rate and the thickness uniformity, and found the heating method to prevent from curling of foil in peeling off from a substrate.The lifetime measurement of the thick foil with 100-250mug/cm^2 have been carried out by using 3.2MeV,1-3muA,^<20>Ne^+ beam with 3.5mmphi spot from Van dee Graff Accelerator at Tokyo Institute Technology. The lifetime in average were obtained to be 80mC/cm^2 which corresponds to 6 times longer than that of commercially available foil.