Conceptual design of a L-band linac for muon acceleration

Kondo, Yasuhiro   ; Otani, Masashi*

A muon linac development for a new muon g-2 experiment is now going on at J-PARC. Muons from the muon beam line (H line) at the J-PARC muon science facility are once stopped in a silica-aerogel target, and room temperature muoniums are evaporated from the aerogel. They are dissociated with lasers, then accelerated up to 212 MeV using a linear accelerator. In the current reference design, a 324 MHz radio frequency quadrupole (RFQ) and an interdigital H-mode drift tube linac (IH-DTL) are used for the low beta acceleration. We propose a 1300 MHz (L band) RFQ and Coupled Cavity DTL (CCDTL) instead of the 324 MHz RFQ and IH-DTL as an alternative to simplify the configuration of the muon linac. In this paper, the present status of the design of this L-band frontend of the muon linac is described. The beam dynamics design has been done and the linac design of a 3.3 m length and 0.4 MW power dissipation was obtain.