Abstract
A new operating mode has been developed for the Linac Coherent Light Source (LCLS) in which we shape the longitudinal phase space of the electron beam. This mode of operation is realized using a horizontal collimator located in the middle of the first bunch compressor to truncate the head and tail of the beam. With this method, the electron beam longitudinal phase space and current profile are reshaped, and improvement in lasing performance can be realized. As a result, we present experimental studies at the LCLS of the beam shaping effects on the free-electron laser performance.
Highlights
Over the past several years, great progress has been made in the realization of high power x-ray free-electron lasers (FELs)
The energy spread at the Linac Coherent Light Source (LCLS) is controlled by a laser heater [5,6], which is designed to suppress the microbunching instability and yet achieve a small final slice energy spread
We report on a recent study at the LCLS for improving the FEL performance with a beam shaping technique, which is realized by truncating the double-horn current spikes with a collimator located at the middle of a bunch compressor
Summary
Over the past several years, great progress has been made in the realization of high power x-ray free-electron lasers (FELs). The energy spread at the Linac Coherent Light Source (LCLS) is controlled by a laser heater [5,6], which is designed to suppress the microbunching instability and yet achieve a small final slice energy spread. This laser heater “knob” can be adjusted during operation for maximizing the FEL photon output. We report on a recent study at the LCLS for improving the FEL performance with a beam shaping technique, which is realized by truncating the double-horn current spikes (at the beam head and tail) with a collimator located at the middle of a bunch compressor.
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