Conversion of a transverse density modulation into a longitudinal phase space modulation using an emittance exchange technique

TL;DR

This paper demonstrates an experimental method to convert a transverse density modulation into a longitudinal phase space modulation using an emittance exchange technique, producing microbunch trains for potential applications.

Contribution

It presents the first experimental demonstration of transverse-to-longitudinal emittance exchange converting a horizontal modulation into a longitudinal microbunch train.

Findings

Successful conversion of transverse modulation into energy modulation

Preliminary data support the conversion process

Simulations suggest temporal microbunch formation

Abstract

We report on an experiment to produce a train of sub-picosecond microbunches using a transverse-to-longitudinal emittance exchange technique. The generation of a modulation on the longitudinal phase space is done by converting an initial horizontal modulation produced using a multislits mask. The preliminary experimental data clearly demonstrate the conversion process. To date only the final energy modulation has been measured. However numerical simulations, in qualitative agreement with the measurements, indicate that the conversion process should also introduce a temporal modulation.