A large acceptance analysing magnet for HTS-ECR source

Abstract

A large acceptance analysing magnet has been designed, fabricated and tested. The design aim is to analyse highly charged ions from a high temperature superconducting electron cyclotron resonance ion source, PKDELIS on a 400 kV high voltage platform. The magnet has a unique design incorporating multipole corrections to minimise higher order aberrations using special pole shapes. For double focussing condition, the entrance and exit shim angles have been optimised after inclusion of the gap effect. Since the analysing magnet will be operated on a high voltage platform, the magnet and associated high current power supply are designed to be air-cooled. Special care has been taken in the design of the magnet to have minimum weight, good acceptance and moderate mass resolution.