Advanced Photon Source

An Office of Science National User Facility

Transverse-to-Longitudinal Emittance Exchange Based Longitudinal Electron Beam M

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Gwanghui Ha, PAL)
Start Date: 
Wednesday, November 15, 2017
Start Time: 
11:15 a.m.

Longitudinal beam manipulation would benefit many accelerator applications, but are rarely employed due to the difficulty of manipulating short duration electron bunches. So far, popular methods to manipulate the longitudinal phase space are with direct control, using a laser and RF, and an indirect control, by introducing a coupling between a transverse axis and a longitudinal axis. The direct control is preferred in terms of the manipulation quality and capability, but the shaping of the laser and the RF have clear limitations. The indirect method introduces a coupling that limits the manipulation quality and capabilities. In this talk, I introduce a new manipulation method using transverse-to-longitudinal emittance exchange (EEX) which exchanges the transverse and longitudinal phase spaces. The longitudinal phase space can be directly controlled in the transverse phase space by means of EEX. Since this exchange technique provides a direct control over the longitudinal, it provides higher quality manipulations and more capabilities than the coupling methods. After the description of how the method works, I will introduce experiments done and planned at the Argonne Wakefield Accelerator facility.

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