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@InProceedings{dooling:napac2019-moplm13,
author = {J.C. Dooling and D. Hui and A.H. Lumpkin and T.L. Smith and Y. Sun and K.P. Wootton and A. Zholents},
% author = {J.C. Dooling and D. Hui and A.H. Lumpkin and T.L. Smith and Y. Sun and K.P. Wootton and others},
% author = {J.C. Dooling and others},
title = {{Investigations of the Electron Beam Energy Jitter Generated in the Photocathode RF Gun at the Advanced Photon Source Linac}},
booktitle = {Proc. NAPAC'19},
pages = {124--127},
paper = {MOPLM13},
language = {english},
keywords = {gun, timing, laser, electron, cathode},
venue = {Lansing, MI, USA},
series = {North American Particle Accelerator Conference},
number = {4},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {10},
year = {2019},
issn = {2673-7000},
isbn = {978-3-95450-223-3},
doi = {10.18429/JACoW-NAPAC2019-MOPLM13},
url = {http://jacow.org/napac2019/papers/moplm13.pdf},
note = {https://doi.org/10.18429/JACoW-NAPAC2019-MOPLM13},
abstract = {Characterizations continue of the electron beam properties of a recently installed S-band photocathode (PC) rf gun at the Advanced Photon Source Linac facility. In this case, we have utilized a low-energy spectrometer beam line located 1.3 m downstream of the gun cavity to measure the electron beam energy, energy spread, and energy jitter. The nominal energy was 6.5 MeV using a gun gradient of 110 MV/m, and the energy spread was ~17 keV when driven by a 2.5-ps rms duration UV laser pulse at the selected rf gun phase. An energy jitter of 25 keV was initially observed in the spectrometer focal plane images. This jitter was partly attributed to the presence of both the 2nd and 3rd harmonics of the 119 MHz synchronization signal provided to the phase locked loop of the drive laser oscillator. The addition of a 150-MHz low-pass filter in the 119-MHz line strongly attenuated the two harmonics and resulted in a reduced energy jitter of ~15 keV. Comparisons of the gun performance to ASTRA simulations will also be presented.},
}