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@InProceedings{denham:napac2019-moplo04,
author = {P.E. Denham},
title = {{Progress in Time-Resolved MeV Transmission Electron Microscopy at UCLA}},
booktitle = {Proc. NAPAC'19},
pages = {243--246},
paper = {MOPLO04},
language = {english},
keywords = {electron, quadrupole, cavity, alignment, detector},
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-MOPLO04},
url = {http://jacow.org/napac2019/papers/moplo04.pdf},
note = {https://doi.org/10.18429/JACoW-NAPAC2019-MOPLO04},
abstract = {We describe here two new enhancements developed for the time-resolved microscope at the UCLA PEGASUS Lab based on the use of a radiofrequency photoinjector as an ultrafast electron source and permanent magnet quadrupoles as electron lenses. The first enhancement is a flexible optical column design including hybrid-style stronger focusing quadrupoles, yielding a 60% magnification increase, and a collimator to improve imaging contrast. This new optical system will have the ability to switch between real-space imaging and diffraction pattern imaging with variable magnification. The second enhancement is a high-frequency (X-band) cavity downstream from the (S-band) photoinjector to reduce the beam energy spread. These enhancements are crucial for improving contrast and image quality. In addition, a pulse-wire alignment method to fiducialize the quadrupole positions to better than 20-um precision is used to reduce the aberrations induced by misalignment and achieve spatial resolution at the 20 nm-level.},
}