LASER ION SOURCE AND HEAVY PARTICLE BEAM THERAPY APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a laser ion source easy in axis alignment of a condenser lens and having a simplified structure.SOLUTION: According to an embodiment, a laser ion source includes: a vacuum container 1 which is evacuated to a vacuum and in which an entrance window 1a for allowing a laser beam L to enter therethrough is formed; a target 2 installed in the vacuum container 1 and for generating ions with an irradiation of the laser beam L; and a condenser lens 4 for condensing the laser beam L on the target 2. The condenser lens 4 is mounted in the entrance window 1a of the vacuum container 1, and the condenser lens 4 is made to serve as a vacuum partition wall.