Transition Radiation Monitors at the Canadian Light Source
Date
2001-05-01
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
ORCID
Type
Degree Level
Masters
Abstract
Diagnostic monitors are required to perform electron beam diagnostic tests at select
points along the beam line of the Canadian Light Source (CLS) synchrotron. The
decision has been made to equip the specified facility locations with Transition
Radiation Monitors (TRM) for diagnostic purposes. TRM systems use Optical
Transition Radiation (OTR), the physical phenomenon by which a charged particle
crossing the boundary between two media emits electromagnetic radiation in the
optical region of the spectrum. For the CLS TRM systems, the electrons traveling
through a vacuum impinge upon aluminum surfaces that serve as the Transition
Radiation (TR) foils. If the TR-emitting foils are made extremely thin, the
infrequent encounters with material atoms causes only negligible acceleration of the
charge, and the process is relatively non-destructive. The foils are mounted on a
driving mechanism, which enable the beam operator to control the placement and
removal of the individual foils in the beam line. The emitted radiation from each TR
foil is focused by a pair of achromatic lenses, and is then imaged by a Charge
Coupled Device (CCD) camera. The image captured by the camera is subsequently
sent to a remote PC for image analysis of the beam cross-section profile and
centroid. This report discusses the theoretical underpinnings of OTR, the prototype
design of the TRM system and tests undergone by the prototype, as well as
describing the possible changes to be made for the subsequent final design of the
TRM system.
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Citation
Degree
Master of Science (M.Sc.)
Department
Physics and Engineering Physics
Program
Physics and Engineering Physics