Photocathode Wiki Project – A website for the community, by the community Siddharth Karkare.

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Presentation transcript:

Photocathode Wiki Project – A website for the community, by the community Siddharth Karkare

Broad Goals Create a free online repository of photocathode info for accelerator applications Encyclopedia for photocathode physics Enable research collaborations easily and advancement of photocathode physics

A wikisite that contains Photocathode look-up table Photocathode preparation details Photocathode theory Photocathode diagnostics and surface characterization Collaboration portal

Photocathode look-up table A table giving info about QE Lifetimes/vacuum conditions Emission wavelengths Thermal Emittance for various cathodes Metal Cathodes Wavelength & Energy: λopt(nm), ℏω (eV) Quantum Efficiency (electrons per photon) Vacuum for 1000h operation (Torr) Work Function,φw (eV) Thermal Emittance (microns / mm(rms)) Eq. (1) Thermal Emittance (microns / mm(rms)) Expt. Bare Metal Cu 250, 4.96 1.4 x 10-4 10-9 4.6 [2] 0.5 1.0 ± 0.1 [3] 1.2 ± 0.2 [4] 0.9 ± 0.05 [5] Mg 266, 4.66 6.4 x 10-4 10-10 3.6 [6] 0.8 0.4 ± 0.1 [6] Pb 250 , 4.96 6.9 x 10-4 4.0 [2] ? Nb ~2 x 10-5 4.38 [2] 0.6 Coated Metal CsBr:Cu 7 x 10-3 ~2.5 CsBr:Nb Dowell et al,NIMA Volume 622, Issue 3, 21 (2010)

Photocathode preparation details Designs of prep chambers Cleaning, preparation and growth procedures from various labs along with lab specific results Diagnostics required during preparation/growth

Photocathode theory Various photoemission models Material specific modeling Electron transport within bulk Surface physics Emission physics

Photocathode diagnostics and characterization Various available surface diagnostics Beam diagnostics Procedures for characterizing photocathodes What to look for while characterizing cathodes

Collaboration portal Techniques and capabilities available at various labs Small scale and large scale facilities Theory collaborations List of publications and references

What we have so far URL - http://photocathodes.chess.cornell.edu

Thanks to Ivan Bazarov and Rick Merluzzi for setting up the website CHESS for hosting it All those who contributed so far…