Design study of new 3-GeV proton beam transport line for MLF second target station

Yamaguchi, Yuji   ; Kondo, Yasuhiro   ; Meigo, Shinichiro   ; Oguri, Hidetomo  ; Oi, Motoki ; Saha, P. K.   ; Shinozaki, Shinichi ; Takayanagi, Tomohiro   ; Yamamoto, Kazami   

A high-power 3-GeV proton beam from a rapid cycling synchrotron (RCS) is transported to a neutron production target at Materials and Life Science Experimental Facility (MLF) by a 3-GeV RCS to Neutron facility Beam Transport (3NBT) line in J-PARC. Recently, the design beam power of 1 MW has been achieved. By this achievement, a future plan of MLF second target station (TS2) is motivated for enhancing brightness of the secondary beams and requires a new beam transport line for the 3-GeV proton beam. The design study of the new transport line has been started based on the previous work and is being performed regarding the optics and shielding of the beamline incorporating latest beam commissioning results. In this presentation, we report a brief concept of the new transport line and current status of the design study.