Techniques for particle identification and energy measurement of helium ions in the intermediate energy range

Techniques used in the particle identification and energy measurement of helium ions with several hundred MeV of kinetic energy are described. In a two arm array, magnetic rigidity, specific ionization, and time-of-flight measurements were employed in the forward arm, while time-of-flight, specific ionization and total energy measurements were employed in the recoil arm. Very clean particle identification was obtained for hydrogen and helium isotopes.