Development of Multi-beam type IH-RFQ Linac System

Abstract

We developed a two-beam type IH-RFQ (Interdigital H type Radio Frequency Quadrupole) linac system to prove the principle of a multi-beam type IH-RFQ linac in Research Laboratory for Nuclear Reactors of Tokyo Institute of Technology. The multi-beam type RFQ linac has several beam channels in a cavity for accelerating high intensity and low energy heavy ion beams. The developed system consists of a two-beam type IH-RFQ cavity as a prototype of the multibeam type cavity, a two-beam type laser ion source with DPIS (Direct Plasma Injection Scheme) and beam analyzers mainly. As a result of the beam acceleration test, the linac system accelerates carbon ions from 5 keV/u to 60 keV/u and generates about 108 mA (2×54 mA/channel) in the total output current. In this paper, we describe the development of the linac system and some results of the beam acceleration test.