Latest studies for metal photocathodes presented at EWPAA 2019
QUASAR members Liam Soomary and Pavel Juarez-Lopez recently presented their latest research at the European Workshop on Photocathodes for Particle Accelerator Applications (EWPAA 2019). The event was hosted by the Paul Scherrer Institut in Switzerland on 11-13 September 2019 and focused on the latest progress in research and development in preparation, instrumentation, theoretical modeling, industrial applications and novel materials used in photocathode manufacturing.
Pavel gave a talk about the ‘Status and experience with TESS’.
The QUASARs gave an overview about their latest research on surface preparation and emittance measurements for metal photocathodes. Liam presented a poster with the title “Surface roughness measurements of a Nb (100) photocathode using STM imaging”. STM imaging was performed for a Nb (100) single crystal sample in ultra-high vacuum conditions to lead to its surface roughness. Pavel gave an update about the “Status and experience with TESS”, mentioning his recent work of Zr, Nb and Cu single crystal photoemission, and furthermore, cryogenic measurements performed with Transverse Energy Spread Spectrometer (TESS).
Low surface roughness on photocathodes is essential to minimise intrinsic emittance in electron beams. Measuring the cathode surface roughness and mean transverse energy is fundamental for photocathode research.
Participants at the European Workshop on Photocathodes for Particle Accelerator Applications 2019 (image EWPAA)
Pavel said: "The workshop was a great opportunity to meet, discuss and build our research direction in terms of the photocathode community. Getting new ideas and possible collaborations from other researchers was the major outcome of this workshop.”
Link to the indico event https://indico.psi.ch/event/6746/page/1353-welcome