Construction and beam commissioning of the GeV-range test beamline at KEK PF-AR

Commissioning a test beamline in KEK Photon Factory Advanced Ring (PF-AR), which is operated by the energy of 6.5 GeV and 5.0 GeV, is proceeded in cooperation with the KEK Institute for Particle and Nuclear Studies (IPNS) to use electron beams in the GeV-range for the development of detectors in particle physics experiments. The electron can be obtained from gamma rays emitted by collisions between the halo of a stored electron beam in PF-AR, and a wire target using a copper converter to electron-positron pair creation. A yielded monochromatic electron beam is guided to the test area by quadrupole magnets and a bending magnet on the test beamline. The trial of long-user operation with top-up injection was completed in the fall of 2022. (author)