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@InProceedings{hessami:napac2019-moplh04, author = {R.M. Hessami and A.F. Amhaz and P. Musumeci}, title = {{Design for HyRES Cathode Nanotip Electron Source}}, booktitle = {Proc. NAPAC'19}, pages = {177--180}, paper = {MOPLH04}, language = {english}, keywords = {electron, cavity, solenoid, gun, 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-MOPLH04}, url = {http://jacow.org/napac2019/papers/moplh04.pdf}, note = {https://doi.org/10.18429/JACoW-NAPAC2019-MOPLH04}, abstract = {A new ultrafast electron diffraction (UED) instrument is being developed by UCLA-Colorado University collaboration for the STROBE NSF Center with the goal of using electron and EUV photon beams to reveal the structural dynamics of materials in non-equilibrium states at fundamental atomic and temporal scales. This paper describes the design of the electron beamline of this instrument. In order to minimize the initial emittance, a nanotip photocathode, 25 nm in radius, will be used. This requires a redesign of the cathode and anode components of the electron gun to allow for the tip to be properly aligned. Solenoidal lenses are used to focus the beam transversely to a sub-micron spot at the sample and a radiofrequency (RF) cavity, driven by a continuous wave S-band RF source, longitudinally compresses the beam to below 100 fs, required for atomic resolution.}, }