Proof examination of alternating phase focusing

We designed and constructed a new compact IH-LINAC with Alternating Phase Focusing (APF). The LINAC was designed to accelerate O+ ions up to 77 keV/u from 10 keV/u as a proof of the APF (0.5 m in length, 0.6 m in diameter and 63 MHz in operation frequency). We constructed a test bench for accelerating protons. It included that a PIG ion source, a focusing lens in front of the cavity and a bending magnet to analyze the accelerated beams. We succeeded in the world's first acceleration with the IH-LINAC using APF. This paper describes the design of the linac and the result of the proof examination.