Abstract
The use of optical transition radiation (OTR) monitors is a standard technique to measure transverse beam profiles at many electron accelerators. With modern accelerator technology it is possible to produce and accelerate even ultrashort electron bunches with sub--femtosecond duration. Such bunches interacting with the OTR target generate coherent optical transition radiation (COTR). For the COTR case, a reconstruction of the bunch profile from a recorded image using a conventional optical scheme is a task with inconclusive solution. In this paper an approach is proposed which is based on the strict propagation of COTR fields through a focusing lens. As result a linear dependence of the measured rms image size on the bunch size is obtained.
Highlights
With modern accelerator technology it is possible to produce and accelerate even ultrashort electron bunches with sub–femtosecond duration. Such bunches interacting with the OTR target generate coherent optical transition radiation (COTR)
Optical transition radiation (OTR) monitors are widely used for transverse profile measurements of relativistic electron beams [1,2,3,4]
In order to take into account the parameters of a real optical system, an approach was developed in Ref. [6] based on the OTR characteristics using the commercial ray tracing program Zemax Optic Studio© [7]
Summary
Optical transition radiation (OTR) monitors are widely used for transverse profile measurements of relativistic electron beams [1,2,3,4]. A profile image generated from a bunch emitting COTR and measured with a standard optical system consisting of a focusing lens would look like a ring structure with a deep central minimum [13]. This is in contrast to a conventional OTR image which is formed by averaging the OTR intensities from each individual electron over all electrons inside the bunch, representing a replica of the original transverse bunch shape.
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