The generation and acceleration of positrons
Date
1963-08
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
ORCID
Type
Degree Level
Masters
Abstract
Positrons will be produced in the University of Saskatchewan
Linear Electron Accelerator by allowing bursts of electrons accelerated
by the first linac section to fall on a thick target. The resulting
positrons can be accelerated by the three succeeding linac sections.
The longitudinal equations of motion for positrons in a linear accelerator
have been solved and results are presented for the field configuration of the Saskatchewan linac sections. These results indicate that
the minimum energy spread at output occurs if the positron burst is
injected with an initial phase of 120° and the magnetic confining system
is designed for positrons of 2 MeV total initial energy. For reasonable
phase spread and energy spread at injection these injection parameters
will yield a positron beam of energy 39.4 ± 0.5 MeV at the end of the
first positron accelerating section and of energy 114.5 ± 1.0 MeV at
the end of the third positron accelerating section.
Two tentative designs are presented for confining the positron
beam within the accelerator aperture. The better system should give a
net conversion efficiency of 4 x 10⁻⁴ e⁺/e⁻ and a time average positron
current of 0.07 μA. The inferior, but less costly, system should give
a net conversion efficiency of 0.7 x 10⁻⁴ e⁺/e⁻ and a time average
positron current of 0.01 μA.
Description
Keywords
Citation
Degree
Master of Science (M.Sc.)
Department
Physics
Program
Physics