Feasibility studies of a vibration wire monitor and a halo scraper in the J-PARC L3BT

Okabe, Kota  ; Yamamoto, Kazami   ; Yoshimoto, Masahiro  ; Kinsho, Michikazu  

In the J-PARC 3-GeV Rapid Cycle Synchrotron (RCS), transverse beam halo diagnostic and scraping are required to increase the output beam power. Wire scanners and halo scrapers were used for measurement of projected beam distributions to determine the extent of beam halo formation at Linac-3GeV Beam Transport line (L3BT). In order to determine more detail of halo formation, Vibration Wire Monitor (VWM) was installed in L3BT for the beam halo measurement. The high sensitivity of the VWM makes it a prospective one for investigation of beam halo and weak beam scanning. In this paper, we will report a preliminary result of beam halo measurement by VWM and halo scraper at L3BT, and discuss about potential of the VWM for beam halo diagnostic.