The beam bunching and transport system of the Argonne positive ion injector

A new positive ion injector (PII) is under construction at Argonne. It will replace the existing 9 MV tandem electrostatic accelerator as an injector into ATLAS (Argonne Tandem-Linac Accelerator System). It consists of an electron-cyclotron-resonance (ECR) ion source on a 350 kV platform injecting into a superconducting linac optimized for very slow ( beta 400, and a doubly isochronous beamline is used to minimize time spread due to path length differences.<>