Polarized X-ray pulses at 0.6 Å have been generated via head-on collision of a laser pulse from the high-field laser
facility at Daresbury with a 30 MeV electron bunch in the ALICE energy recovery linear accelerator. The angular
distribution of the backscattered X rays was obtained in single-shot using a scintillation screen. The temporal profile of
the X ray yield as a function of the time delay between the laser pulse and electron bunch was measured and agreed well
with that expected from the collision point dependence of the laser-electron beam longitudinal overlap.
Dead time in detectors limits the capability of the detector to work at high counting rates. A correction for dead time can
be used to estimate the particle flux from a measurement. A motivation for operating detectors at high counting rates is
to get the best statistical accuracy. It is therefore also important to correct measurements for the loss of statistical
accuracy that occurs when dead time is present. When the source of particles has a time dependent variation in intensity,
the conventional dead time correction may not apply. A new dead time correction that applies in this case is presented.
Inverse Compton is a promising method to implement a high brightness, ultra-short, energy tunable X-ray source at accelerator facilities. We have developed an inverse Co Compton ba mpton backscattering X-ray source driven by the multi 10 TW-L backscattering Laser installed at Daresbury (COBALD). Hard X-rays, with spectral peak ranging from 15 to 30 keV, depending on the scattering geometry, will be generated through the interaction of a laser pulse with an electron bunch delivered by the energy recovery linear accelerator prototype (ERLP) at Daresbury. X-ray pulses containing 9×107 photons per pulse will be created from head on collisions, with a pulse duration comparable to that of the incoming electron bunch. For transverse collisions 8×106 photons per pulse will be generated, where the laser pulse transit time defines the X-ray pulse duration. The peak spectral brightness is predicted to be ~ 1021 photons / s / mm2 / mrad2 / 0.1% ΔE/E, which is
comparable to fourth generation synchrotron light sources.
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