Many parallel laser beams can be formed in an asymmetrical confocal cavity. Since position and size of those beams are controllable, those beams, called as “multi-laser-wire”, can be used as a profile monitor of ion beam when a proper interaction between laser beam and ion beam is applicable. A multi-laser-wire profile monitor of 400 MeV H⁻ beam based on the photo-detachment is proposed.

I was working at TRIUMF in Vancouver for a year from April 2015, using the support program for long-term research abroad of KEK. I joined in the performance tests of 9 cell superconducting cavities for ARIEL#3 and #4, and the modularization of ARIEL#3. The ICM2 module composed of ARIEL#3 was completed in March 2016. Below is a one-year stay report at TRIUMF.

We describe the development of antihydrogen beams for the hyperfine spectroscopy of ground-state antihydrogen atoms using a cusp trap in ASACUSA (Atomic Spectroscopy and Collisions Using Slow Antiprotons) experiments. The magnetic field generated by a superconducting anti-Helmholtz coil of the cusp trap is expected to produce spin-polarized antihydrogen beams. Recently, the ASACUSA collaboration succeeded in synthesizing antihydrogen atoms and producing antihydrogen atomic beams from the cusp trap. This is important step to advancing towards precision in-flight spectroscopy of antihydrogen atoms.