INVESTIGATION OF THE LIFETIME OF A HIGH-CURRENT BEAM IN AN ULTRAMINIATURE STORAGE RING

摘要

The lifetime of an electron beam in an ultraminiature storage ring is calculated by two different methods. The working parameters of the ring are as follows: electron energy E - 45 MeV, radius of curvature of the beam orbit R_0 = 1.947 cm, average beam current I_(beam) = 20 mA, number of bunches K_b - 1, rms bunch length δ_L - 0.3 mm, transverse rms dimensions δ_X = δ_Z = 0.1 mm. It is established that for magnetic field drop-off exponent n = 0.01 the lifetime of the beam as calculated according to the Touschek effect is 15 times longer than the value obtained using an empirical relation that describes the longest beam lifetime achieved in operating storage rings.