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@inproceedings{margraf:ipac2021-tupab109,
author = {R.A. Margraf and Z. Huang and J.P. MacArthur and G. Marcus and T. Sato and D. Zhu},
title = {{Characterization of the X-Ray Angular Pointing Jitter in the LCLS Hard X-ray Undulator Line}},
booktitle = {Proc. IPAC'21},
pages = {1640--1643},
eid = {TUPAB109},
language = {english},
keywords = {undulator, FEL, electron, cavity, detector},
venue = {Campinas, SP, Brazil},
series = {International Particle Accelerator Conference},
number = {12},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
issn = {2673-5490},
isbn = {978-3-95450-214-1},
doi = {10.18429/JACoW-IPAC2021-TUPAB109},
url = {https://jacow.org/ipac2021/papers/tupab109.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-TUPAB109},
abstract = {{The angular pointing jitter of X-ray pulses produced by an X-ray Free-Electron Laser (XFEL) depends on both intrinsic properties of the SASE (Self-amplified spontaneous emission) process and jitters in beamline variables such as electron orbit. This jitter is of interest to the Cavity-Based XFEL (CBXFEL)* project at SLAC, which will lase seven undulators inside an X-ray cavity of four diamond Bragg mirrors. The CBXFEL cavity has a narrow angular bandwidth, thus large angular jitters cause X-rays to leak out of the cavity and degrade cavity efficiency. To understand contributors to angular pointing jitter, we studied the pointing jitter of the Linac Coherent Light Source (LCLS) Hard X-ray Undulator line (HXU). Monochromatic and pink X-rays were characterized at the X-ray Pump Probe (XPP) instrument. We found pulses with high monochromatized pulse energy and small electron beam orbit in the undulator have the lowest angular pointing jitter. We present here our measurement results, discuss why these factors correlate with pointing stability, and propose a strategy for CBXFEL to reduce angular pointing jitter and account for angular pointing jitter in cavity efficiency measurements.}},
}