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@unpublished{macarthur:ipac2021-frxa07,
author = {J.P. MacArthur and Z. Huang and J. Krzywiński and G. Marcus and R.A. Margraf and T. Sato and D. Zhu},
% author = {J.P. MacArthur and Z. Huang and J. Krzywiński and G. Marcus and R.A. Margraf and T. Sato and others},
% author = {J.P. MacArthur and others},
title = {{Ringdown Measured in a Four-Bounce, 20 Meter Hard X-Ray Cavity}},
booktitle = {Proc. IPAC'21},
language = {english},
intype = {presented at the},
series = {International Particle Accelerator Conference},
number = {12},
venue = {Campinas, SP, Brazil},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
note = {presented at IPAC'21 in Campinas, SP, Brazil, unpublished},
abstract = {{A cavity-based hard x-ray free-electron laser (CBXFEL) could produce fully coherent pulses with a bandwidth several orders of magnitude below the intrinsic bandwidth of SASE. A cavity-based FEL is not a new concept - the first FEL was an oscillator operating at 3.4 um - but single-pass amplification of spontaneous radiation was the fastest path to gigawatt x-ray powers. One unproven component of a CBXFEL is a stable, high reflectivity cavity. To address this deficit we present ring-down measurements in a 20 m round-trip cold cavity operating at 9.8 keV. The cavity is composed of four strain-relief-cut diamond 400 Bragg mirrors and a transmission grating for in/out-coupling. It is a testbed for alignment protocols and component performance under realistic experimental conditions like source instability, optics imperfections, and thermal drift.}},
}