Some results of the Vavilov-Cherenkov radiation arising at a nonuniform mot
ion of a charged particle in a radiator are presented. Considerable broaden
ing of the width of VChR ring in the case of the broader radiator compared
to the thinner one is observed. The particle velocity variation in the radi
ator due to large energy losses of heavy ions is the only explanation of th
is effect. (C) 1999 published by Elsevier Science B.V. All rights reserved.