Magnetic pulse compression using a third harmonic RF linearizer

Formation of electron bunches for harmonic cascade x-ray free electron lasers

“…However, a nonlinear energy modulation of electrons in the electron bunch can cause a frequency chirp in the output signal [11,12] which broadens the bandwidth significantly beyond the Fourier transform limit. 1 The rf harmonic linearizer [13] often helps to remove major nonlinear components in the energy modulation of electrons, but, frequently, even the remaining modulation significantly broadens the bandwidth, in particular, when strong linac structural wakefields are present. In this paper we propose a complementary technique which employs a specially shaped distribution of electron density and the wakefields themselves in order to avoid the remaining energy modulation of electrons.…”

Measurement and simulation of the impact of coherent synchrotron radiation on the Jefferson Laboratory energy recovery linac electron beam

“…To correct these effects, it is common to linearize the bunch and remove any higher-order longitudinal correlations. This is often accomplished by using a higher-order harmonic cavity [15]. The JLAB FEL, however, takes advantage of its two recirculation arcs to correct the higher-order moments of the beam during both compression and energy recovery.…”

Overview of phase space manipulations of relativistic electron beams

“…It is well-known that linearizing the beam longitudinal phase space with a harmonic rf cavity can improve the performance of a bunch compressor [25,26]. On the other hand, the harmonic cavity has also been used to reduce the slope of the rf cavity voltage in storage rings to lengthen the equilibrium bunch length to increase the beam life time (see, for example [27]).…”