Abstract
A positron separator is one of the essential components of a muon beamline to eliminate contamination in the beam, mainly positrons that have the same momentum as muons and are transported together with the beam. In order to eliminate positrons efficiently, we selected a Wien filter type three-stage positron separator for the new muon beamline, called Superomega, that is under construction in the Materials and Life Science Experimental Facility (MLF) of the Japan Accelerator Research Complex (J-PARC). The Superomega muon beamline is the second muon beamline at MLF/J-PARC, and started operation in October of 2012. Here, we report on the features and the test results of the positron separators installed in the Superomega muon beamline.
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