High-intensity polarized and un-polarized sources and injector developments at BNL Linac

Abstract

The AGS-RHIC pre-injector complex includes a high-intensity (magnetron type) H− ion source, an Optically Pumped Polarized Ion Source (OPPIS); 750 keV RFQ and 200 MeV Linac. In this paper we will focus on the recent Linac pre-injector upgrade with three sources: two magnetron sources and OPPIS. We also present the recent magnetron development to higher duty factor and reliability. Both magnetron sources produce 120-130 mA current (maximum 150 mA, 600-1000 us pulse duration, 7 Hz repetition rate). The LEBT improvement resulted in beam intensity increase (after RFQ at 750 keV) to 80 mA (maximum 90 mA). The polarized beam efficiency transport will be also improved due to shorter LEBT line and electrostatic Einzel lenses replacement with the magnetic quadrupole lenses. The experience of the two sources layout operation (one source in operation the second source in standby) might be useful for facilities with the high downtime cost (like high-energy collider LHC or multi-user facilities like SNS).