ILC Positron Source Based on Liquid Metal Target

Positron generation is one of the most difficult technical challenges among ILC (International Linear Collider) sub-systems. In Conventional method, the positrons are gen-erated, via the pair-creation process in Electro-magnetic shower induced by electron beam in a target. In ILC, a pulse train contains 2625 (5120 for low Q parameter) 3.2 nC (1.6 nC) bunches and a fixed solid metal as the positron production target can not survive and a fast rotating target (more than 100 m/s tangential speed) is required. The cur-rent baseline design is based on Undulator radiation, which mitigates the thermal stress slightly, but not dramatically; 90 m/s tangential speed is still necessary. In this article, I propose an ILC positron source based on Conventional method with a liquid metal target system under develop-ment in Budkha Institute for Nuclear Physics, Novosibirsk, Russia. This concept resolves not only the technical dif-ficulty on the target, but also issues on system complex-ity introduced by the Undulator method: path length con-dition, inter-system dependency, commissioning scenario, problems associated with electron deceleration, etc. This scheme makes the whole ILC system much simpler and the system availability higher