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We compare three techniques for characterising the transverse phase spacedistribution of the beam in CLARA FE (the Compact Linear Accelerator forResearch and Applications Front End, at Daresbury Laboratory, UK): emittanceand optics measurements using screens at three separate beamline locations;quadrupole scans; and phase space tomography. We find that where the beamdistribution has significant structure (as in the case of CLARA FE at the timethe measurements presented here were made) tomography analysis is the mostreliable way to obtain a meaningful characterisation of the transverse beamproperties. We present the first experimental results from four-dimensionalphase space tomography: our results show that this technique can provide aninsight into beam properties that are of importance for optimising machineperformance.

Transverse phase space characterisation in the CLARA FE accelerator test facility at Daresbury Laboratory