EXPERIMENTS ON 5 MEV PROTON-BEAM FOCUSING BY PLASMA LENS

The plasma lens is investigated for focusing of a proton beam of energ y 5 MeV, current 10 mA, and pulse duration 30 mu s, obtained on the ac celerator ''Ural-5'' with radio-frequency quadrupole (RFQ) radial-phas e focusing. The parameters of the plasma flow produced by a coaxial pl asma gun are the following: plasma density 10(11)-10(15) cm(-3), tempe rature 1-3 eV, velocity 10(7) cm/s, and time duration 500 mu s. The ma gnetic-field value of a short coil is 500-1000 Oe. The focusing coeffi cient is ten times the compression at the length of 30 cm obtained. Th e dependence of ion-beam size upon various parameters of the plasma le ns is investigated. (C) 1998 American Institute of Physics.