- Open Access
Transverse phase space mapping of relativistic electron beams using optical transition radiation
Phys. Rev. ST Accel. Beams 2, 122802 – Published 20 December, 1999Erratum Phys. Rev. ST Accel. Beams 5, 059901 (2002)
DOI: https://doi.org/10.1103/PhysRevSTAB.2.122802
Abstract
Optical transition radiation (OTR) has proven to be a versatile and effective diagnostic for measuring the profile, divergence, and emittance of relativistic electron beams with a wide range of parameters. Diagnosis of the divergence of modern high brightness beams is especially well suited to OTR interference (OTRI) techniques, where multiple dielectric or metal foils are used to generate a spatially coherent interference pattern. Theoretical analysis of measured OTR and OTRI patterns allows precise measurement of electron beam emittance characteristics. Here we describe an extension of this technique to allow mapping of divergence characteristics as a function of transverse coordinates within a measured beam. We present the first experimental analysis of the transverse phase space of an electron beam using all optical techniques. Comparing an optically masked portion of the beam to the entire beam, we measure different angular spread and average direction of the particles. Direct measurement of the phase-space ellipse tilt angle has been demonstrated using this optical masking technique.
Erratum
Erratum: Transverse phase space mapping of relativistic electron beams using optical transition radiation[Phys. Rev. ST Accel. Beams 2, 122802 (1999)]
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- It should be noted that “quad-scan” techniques measure only the whole-beam average emittance values and are affected by space charge. There is no ability to raster through individual sections of the beam, and beam statistics must be gathered over a large number of pulses as the magnet parameters are varied. Transition radiation techniques are unaffected by space charge considerations. See Helmut Wiedemann, Particle Accelerator Physics: Basic Principles and Linear Beam Dynamics (Springer-Verlag, New York,1993).
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