STUDY OF INCOHERENT BEAM - BEAM EFFECTS AT RADIOACTIVE ISOTOPE BEAM FACTORY

摘要

Merging ion-ion collisions is an important feature of the proposed RIKEN Radioactive Isotope Beam Factory. In the merging collision case, the value of luminosity 10~(26) 1/cm~2 sec is several orders of magnitude less than for head-on collisions because both beams have almost the same vector of velocity and merging angle is rather small (1-10°) even when the stored number of ions is close to the space charge limit of 10~(12) particles. In the present paper, the beam-beam effects are studied for the coasting merging beam collisions using particle-in-cell (PIC) model in 4D phase space. Tolerable incoherent beam - beam tune shift and beam disruption effect such as emittance growth have been evaluated from high order nonlinear resonances study. Beam luminosity and beam life time due to beam-beam effects are estimated as a function of main collider parameters.