Proton beam deflection using silicon crystal at the KEK proton synchrotron

An experiment on deflection of a proton beam using a Silicon crystal was performed for the first time in Japan at the 12-GeV Proton Synchrotron of KEK. The (111) plane of the crystal was used to deflect a 12 GeV proton beam at an angle of 32.6 mrad. The beam extraction efficiency of the crystal was reached 13%. The divergence of the proton beam can be identified by comparison of the experimental data with simulated results.