Speaker
Masahiro Yoshimoto
(JAEA/J-PARC)
Description
In the J-PARC RCS, transverse beam profiles including both the beam core and halo at the extraction beam transport line (3NBT) were measured by using a combination with a wire scanner type beam scraper and beam loss monitors (BLMs). Our final goal of this halo monitor is to measure the intra-bunch beam halo of extracted two bunches from the RCS. Thus the plastic scintillator and photomultiplier (PMT) assemblages were adopted as the BLMs with quick time response. However, we found that the BLMs detected not only the radiation from the wire but also the reflected radiation from other devices and walls. Therefore we tried to develop new-type BLMs, which are scintillation-type BLM with lead glass and Cherenkov-type BLM with quartz or UV acrylic. In this presentation, we will present an overview and experimental results of the new-type BLMs together with an outline of halo monitor system.
Author
Masahiro Yoshimoto
(JAEA/J-PARC)