Post-Doctoral Position at DESY for Pavel Juarez-Lopez
07 Oct 2020



Congratulations to Pavel for all he has achieved at Daresbury

Pavel Juarez-Lopez working with the Transverse Energy Spread Spectrometer (TESS) in the VISTA Laboratory.

​Pavel Juarez-Lopez working with the Transverse Energy Spread Spectrometer (TESS) in the VISTA Laboratory.


Pavel Juarez-Lopez joined the Cockcroft Institute in October 2016 as a Ph.D. student jointly appointed by the University of Liverpool and ASTeC to research the performance of photocathode electron sources for high-brightness beams.  He is now coming to the end of his studies having used the TESS (Transverse Energy Spread Spectrometer) to characterise photoemission from a wide variety of photocathode sources including pure metals, alkali metals and semiconductors, and he is currently writing his thesis based on this work.

Recently Pavel secured a prestigious Post-Doctoral position at the DESY[1] laboratory in Hamburg where he will join the Vacuum Group to support the European XFEL.  One of the primary duties in this role will be the maintenance of the caesium telluride photocathode electron source for the European XFEL, though the group also have interests in developing and improving the growth and preparation method for this cathode, plus supporting other facilities located on the DESY site.

Lee Jones is Pavel's Ph.D. supervisor for ASTeC and has worked closely with him during his research:

I am delighted that Pavel has secured this position which will allow him to continue to develop his expertise in the field of photocathode electron sources while supporting and enabling the operation of the XFEL which is a critical piece of European research infrastructure.  He will be sorely missed by me and many colleagues at Daresbury Laboratory, and he has my best wishes for the future."

Carsten Welsch is Pavel's Ph.D. supervisor for the University of Liverpool, and added:

International collaboration is key for cutting edge research and Pavel's project has highlighted this.  Consejo Nacional de Ciencia y Tecnología (Conacyt) in Mexico have kindly supported him throughout his Ph.D. and he has gained a number of international experiences throughout his Ph.D.  It has been a pleasure seeing how his project progressed over the years and we now look forward to seeing how he will apply his skills onto new challenges."

Pavel is currently making plans for his move to Hamburg, and trying to secure suitable accommodation from afar and during a viral pandemic – a double challenge, on top of writing-up his doctoral thesis.  He will start his new job on Monday November 2nd.

[1] Deutsches Elektronen-Synchrotron –

Contact: Diakun, Joseph (STFC,DL,AST)