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Title	Developments in Photocathode R&D at STFC Daresbury Laboratory: New Transverse Energy Spread Measurements and the Development of a Multi-Alkali Photocathode Preparation Facility
Authors	L.B. Jones, B.L. Militsyn, T.C.Q. Noakes STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom L.B. Jones, D.P. Juarez-Lopez, B.L. Militsyn, T.C.Q. Noakes, L.A.J. Soomary, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom D.P. Juarez-Lopez, L.A.J. Soomary, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom
Abstract	Photocathode R&D activity within ASTeC is focussed on further development of the tools required for the preparation and characterisation of high performance photocathodes for X-FELs. Our Transverse Energy Spread Spectrometer (TESS)* experimental facility can be used with III-V semiconductor, multi-alkali and metal photocathodes to measure transverse and longitudinal energy distributions of the emitted electrons. Recently TESS has been upgraded to increase the instrument sensitivity for operation with low QE materials under UV illumination. Our R&D facilities also include in-vacuum quantum efficiency measurement, XPS, STM, plus ex-vacuum optical and STM microscopy for surface metrology. Intrinsic photocathode emittance is affected by many factors including illumination wavelength and surface roughness. We present energy distribution measurements for electrons emitted from copper, niobium and zirconium photocathode samples with measured levels of surface roughness under illumination by wavelengths between 256 and 291 nm. We also present an update on progress to establish a multi-alkali photocathode preparation facility to support the CLARA** linear accelerator.
Footnotes & References	* Proc. FEL’13, TUPPS033, 290-293 ** CLARA Conceptual Design Report J. Inst. 9 T05001
Paper	download WEPNEC17.PDF [2.453 MB / 4 pages]
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Conference	ERL2019
Series	ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs (63rd)
Location	Berlin, Germany
Date	15-20 September 2019
Publisher	JACoW Publishing, Geneva, Switzerland
Editorial Board	Atoosa Meseck (HZB, Berlin, Germany); Meghan McAteer (HZB, Berlin, Germany); Volker R.W. Schaa (GSI, Darmstadt, Germany); Jens V\xF6lker (HZB, Berlin, Germany)
Online ISBN	978-3-95450-217-2
Received	04 October 2019
Accepted	01 November 2019
Issue Date	24 June 2020
DOI	doi:10.18429/JACoW-ERL2019-WEPNEC17
Pages	103-106
Copyright	Published by JACoW Publishing under the terms of the Creative Commons Attribution 3.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.