The university of toledo beam foil facility

Abstract

The facility for experimental work in beam foil spectroscopy being developed at The University of Toledo involves several novel features which will be described here. These include: 1. 1. Provisions for optically scanning the ion beam and automatically recording the data so obtained in a multichannel analyzer. Scanning is accomplished by moving a collimating lens and mirror parallel to the beam with constant velocity. The collimated beam is subsequently focused on the entrance slit of a Perkin Elmer f̵/4.5 grating monochromator. Single photons are detected and pulses are recorded in a multiscaler synchronized with the beam scanner. 2. 2. A facility for making charge state identification of spectral lines using a technique which is compatible with the geometry employed for mean life measurements is being constructed. A set of parallel electric field plates can be raised in the observation chamber to beam level through vacuum feed-throughs and a transverse electric field applied. Light from the beam is observed through a slit located a distance L downstream along the plate and spectral wavelengths are determined for both directions of the applied electric field E. The net transverse Doppler shift induced can easily be seen to be Δλ/λ=Z·2eEL/(2mc 2T) 1 2 , where T and mc 2 are the kinetic and rest energies of the ion beam respectively. Introduction of representative parameters shows that a shift of 2 Å/unit charge is easily attainable. 3. 3. Use of nanosecond pulsed beam time of flight techniques to measure the energy of the ion beam after it emerges from the foil. This technique has been in routine use in this laboratory in nuclear physics experiments and its extension to these applications will be described.