The heavy ion injector at the Zürich AMS facility

Abstract

A heavy ion mass spectrometer has been set up at the low energy side of the ETH/PSI-AMS facility. The new system provides better mass resolution for all measurements and expands the accessible mass range to the upper end of the periodic system. High mass resolution is achieved by a combination of energy and momentum filters. A 90 ° spherical electrostatic analyzer acts as an energy filter ( E ΔE = 500) and is followed by a stigmatic 90 ° dipole magnet ( m Δm = 370) . The magnet is supplied with a beam switching system for quasi-simultaneous injection of all isotopes of an element. The details of the experimental setup are given and the mass separation capability of the system is discussed in a first order approximation. First results of 36Cl measurements under routine conditions and results of 40Ca and 129I test measurements are given.