Abstract
One of the goals of the Fermilab A0 photoinjector is to experimentally investigate the transverse to longitudinal emittance exchange (EEX) principle. Coherent synchrotron radiation in the emittance exchange line could limit the performance of the emittance exchanger at short bunch lengths. In this paper, we present experimental and simulation studies of the coherent synchrotron radiation (CSR) in the emittance exchange line at the A0 photoinjector. We report on time-resolved CSR studies using a skew-quadrupole technique. We also demonstrate the advantages of running the EEX with an energy chirped beam.
Highlights
The ability to manipulate the 6D phase space of the electron beam is important for both modern and future accelerators
The emittance exchange line consists of a TM110 cavity sandwiched by doglegs, a variation of the original scheme proposed by Cornacchia and Emma [2], where the cavity was in the middle of a chicane
We show how coherent synchrotron radiation effects (CSR) was used to measure the bunch length of the electron beam and compare those results with numerical simulations
Summary
The ability to manipulate the 6D phase space of the electron beam is important for both modern and future accelerators. One such phase-space manipulation scheme involves exchanging the longitudinal emittance with the transverse emittance of the beam. At the Fermilab A0 photoinjector, a proof-of-principle experiment of an emittance exchange (EEX) scheme has been demonstrated recently [1]. Neither scheme takes into account collective effects such as space charge, coherent synchrotron radiation, and wakefields. Our goal in this work is to investigate coherent synchrotron radiation effects (CSR) in the emittance exchange line at the Fermilab A0 photoinjector. We show how CSR was used to measure the bunch length of the electron beam and compare those results with numerical simulations.
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