Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10674793 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2013 | 4 Pages |
Abstract
In order to account for the increasing demand for strong molecular beams for nuclear physics experiments at ISOLDE, a new radioactive ion source concept based on an RF discharge in a magnetized plasma was developed at CERN. Experimental studies at the ISOLDE offline separator show that the optimum conditions for CO+ and CO2+ ion production are given when the ion source is operated with He plasma, in line with expectations based on their electron impact ionization cross-sections. At optimum tuning, ionization efficiencies of 2.5% and 4% were measured for CO+ and Ar+, respectively. The capability of the Helicon ion source prototype for ISOL operation was evaluated during two online runs at the General Purpose Separator of CERN-ISOLDE, yielding the first observation of 17CO+ with a HfO2 fibre target, and a more than 50-fold enhancement of the 10CO+ and 11CO+ yields with a nanostructured CaO target and an upgraded ion source prototype.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
M. Kronberger, A. Gottberg, T.M. Mendonca, J.P. Ramos, C. Seiffert, P. Suominen, T. Stora,