Beam testing of crystal focusing device with large angular acceptance

Annotation. The use of channeling in crystals is quite effective for controlling the primary proton beam, but to manipulate secondary beams π, K, etc., it is necessary not only to deflect them, but also to focus them, since here the beam divergences are much higher. Focusing devices created to date are suitable for applications at TeV-class accelerators because they have small transverse dimensions. To increase the angular acceptance, a device consisting of several crystals assembled into an array is proposed. In this case, two problems are solved: a large bending angle and acceptable angular acceptance of the device are ensured, which makes it possible to use it at a beam energy of 50 GeV on the domestic U-70 accelerator. The paper presents the results of testing a new device on the U-70 beam.