Beam characterization for the field-emitter-array cathode-based low-emittance gun

S C Leemann,A F Wrulich,A Streun

doi:10.1103/physrevstab.10.071302

S C Leemann, A F Wrulich + Show 1 more

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https://doi.org/10.1103/physrevstab.10.071302

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Abstract

A $1\text{ }\AA{}$ x-ray free electron laser can be operated at 6 GeV provided a very high brightness electron beam. Therefore, Paul Scherrer Institute has initiated development of the low-emittance gun based on field emission. A field-emitter array (FEA) is expected to deliver high peak current while reducing the source emittance to levels close to the thermal limit. A 100 keV gun test stand has been designed in order to gain experience with electron bunches emitted by pulsed FEAs, investigate emittance compensation, and develop diagnostic procedures to characterize the beam. First FEA samples have been installed and pulsed in the gun; the emitted bunches have been accelerated and characterized. We present results acquired with the first FEA samples.

Highlights

IntroductionIn the quest for higher brightness synchrotron radiation, the first 4th generation sources are presently under construction
In the quest for higher brightness synchrotron radiation, the first 4th generation sources are presently under construction. These sources are based on x-ray free electron lasers (X-FEL) where intense high energy electron beams generate short-pulsed, spatially and temporally coherent radiation with wavelengths as low as 1 A
Several field-emitter array (FEA) of this type have been installed at the test stand

Summary

Introduction

In the quest for higher brightness synchrotron radiation, the first 4th generation sources are presently under construction. These sources are based on x-ray free electron lasers (X-FEL) where intense high energy electron beams generate short-pulsed, spatially and temporally coherent radiation with wavelengths as low as 1 A. The most advanced projects are the LCLS at SLAC [1] and the European XFEL at DESY [2]. These facilities require long linac sections to accelerate the short and intense electron bunches to 14 and 20 GeV, respectively. It is crucial to develop a concept which reduces the required beam energy given by the desired radiation wavelength according to the spatial coherence criterion " n < ;

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