Experimental Characterizations of 4-D Transverse Phase Space of a Compressed Beam

Coherent synchrotron radiation (CSR) may severely deteriorate electron beam qualities, such as distortion of energy spectrum and transverse phase-space in the bending plane when the beam transports through a magnetic bunch compressor. Recently some laboratories conducted some investigations on CSR effects but mostly focused on the measurements of emittance growth and energy spread and or/energy loss. However, these parameters may not completely represent a fully compressed beam because its phase spaces may be severely distorted and thus some information may be lost if only these basic parameters are used. It is preferred to reconstruct six-dimensional phase spaces of a compressed beam using tomographic techniques in order to fully understand a beam affected by CSR effects. This report will focus on the four-dimensional transverse phase-space tomographic measurements for a fully compressed beam at 60-MeV energy. Its experimental characterizations at different beam parameters are preliminarily examined.