Arun Saini

Failure Modes and Beam Losses Studies in ILC Bunch Compressors and Main Linac

Proposed International linear collider (ILC) involves high average beam power. Dealing with high average beam power and smaller beam sizes result in stringent tolerances on beam losses and therefore, extensive studies are required to investigate every possible scenarios that lead to beam losses. In this paper we discuss beam losses due to failure of critical elements in beamline for ILC bunch compressors and main linac. INTRODUCTION The ILC [1] is a proposed electron-positron linear (linac) collider with nominal center of mass energy (Ecm) in range of 250-500 GeV. It would deliver a beam pulse containing 1312 bunches (NB) with 2x1010 particles per bunch (np) at repetition rate (frep) of 5Hz. Thus, average beam power (P) estimated using equation (1) is about 5MW. ; CM rep B p E f N n P  (1) As shown in equation (2), luminosity (L) is inversely proportional to the transverse RMS beam sizes (x, y). Thus, in order to achieve high luminosity ILC would deliver a beam with smaller RMS size < 100 m.