Development of hybrid type carbon stripper foils with high durability at >1800K for RCS of J-PARC

The Japan-Proton Accelerator Research Complexes (JPARC) requires thick carbon stripper foils (200-300 μg/cm
²
) to strip electrons from the H-beam supplied by the linac before injection into the RCS of J-PARC. Highintensity H
^-
beam and circulating bunched beam give much energy depositions to conventional carbon stripper foils. Thus carbon stripper foils with high durability at 1800K are urgent and indispensable for this accelerator. Recently, we have developed Hybrid type Boron mixed Carbon stripper foils (HBC-foil). Namely, the lifetime measurement of the foils was tested by using a 3.2 MeV, Ne+ DC beams of 2.5μA, in which a significant amount of energy was deposited in the foils. We have investigated double-layered effects on the lifetime of the HBC-foils. The maximum lifetime was found to be extremely long , 30-and 250 -times longer than those of Diamond and commercially available best carbon foils (CM-foil). It was also found that the foils show free from shrinkage, and an extremely low thickness reduction rate even at a high temperature of 1800K. In this poster the foil preparation procedure and lifetime measurements with a 3.2 MeV Ne+ beam is reported.