Present Status of Development of Thick Long-Lived Hybrid Carbon Stripper Foils for the 3 GeV Proton Booster Ring

摘要

JAERI-KEK joint accelerator as a typified high power proton beam requires thick carbon stripper foils from 300 to 500 μg/cm~2 to stripe electrons from the H~- beam. In such high energy and high intensity beam bombardment, the foil lifetime is very short due to the radiation damage. Consequently, this short lifetime makes a great low operation efficiency of accelerator and highly hazardous work for the foil exchanger personal. Therefore, it is essentially important to make a breakthrough of the preparation method for long-lived carbon stripper foils. For this purpose, we have been performing systematic research, development and production with high reproducibility using a controlled AC□DC arc-discharge method.