The Cherenkov method of simultaneous determination of the mean energy and direction of a 650 MeV proton beam

This article presents the results obtained in a test of the Cherenkov method for simultaneous measurement of the mean energy and direction of a collimated 650 MeV proton beam from the phasotron of the Laboratory of Nuclear Problems. To make requirements to the proton beam intensity less strict, the Vavilov-Cherenkov radiation (VChR) was registered in a wid range of wavelengths, and the LiF radiator dispersion effect was eliminated by an achromatic LK-4 glass prism. Equations and formulae are given to calculate parameters of a system like this. The test results have shown that the mean energy of protons can be determined with an accuracy of ΔE=±0.2 MeV; at the same time the beam oblique angle is measured with an accuracy of Δα=±25''. (orig.)