Abstract
We compare three techniques for characterising the transverse phase space distribution of the beam in CLARA FE (the Compact Linear Accelerator for Research and Applications Front End, at Daresbury Laboratory, UK): emittance and optics measurements using screens at three separate beamline locations; quadrupole scans; and phase space tomography. We find that where the beam distribution has significant structure (as in the case of CLARA FE at the time the measurements presented here were made) tomography analysis is the most reliable way to obtain a meaningful characterisation of the transverse beam properties. We present the first experimental results from four-dimensional phase space tomography: our results show that this technique can provide an insight into beam properties that are of importance for optimising machine performance.
Highlights
Knowledge of transverse beam emittance and optical properties are essential for the commissioning and performance optimization of many accelerator facilities
We report the results of studies on CLARA FE (Compact Linear Accelerator for Research and Applications, Front End) at Daresbury Laboratory [11,12], aimed at characterizing the transverse phase space of the electron beam
We have presented the first experimental results from four-dimensional phase space tomography in an accelerator
Summary
Knowledge of transverse beam emittance and optical properties are essential for the commissioning and performance optimization of many accelerator facilities. Our studies of phase space tomography include the first experimental demonstration of beam tomography in four-dimensional phase space [13,14] We find that this technique can provide information on coupling in the beam, which can be of value for optimizing machine performance [15]. The quadrupole scan technique has some advantages over the three-screen analysis, but neither method can determine the detailed structure of the beam distribution in phase space Such information can be provided by the final analysis technique, phase space tomography, which is considered in Sec. III C. Given the complicated structure generally present in the phase space distribution of the beam in CLARA FE, phase space tomography provides important insights into the beam properties and behavior that would not be obtained from the three-screen or quadrupole scan analysis techniques. V, we summarize the key results, discuss the main conclusions, and consider appropriate directions for further work
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