Open AccessBi-alkali antimonide photocathodes for high brightness accelerators
Author(s) -
S. Schubert,
M. Ruiz-Osés,
I. BenZvi,
T. Kamps,
Xue Liang,
Erik Müller,
Kathrin Müller,
H. A. Padmore,
T. Rao,
Xiao Tong,
T. Vecchione,
J. Smedley
Publication year - 2013
Publication title -
apl materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.571
H-Index - 60
ISSN - 2166-532X
DOI - 10.1063/1.4821625
Subject(s) - antimonide , photocathode , materials science , caesium , alkali metal , x ray photoelectron spectroscopy , stoichiometry , substrate (aquarium) , analytical chemistry (journal) , thermal emittance , antimony , layer (electronics) , surface roughness , surface finish , getter , halide , optoelectronics , optics , inorganic chemistry , metallurgy , chemical engineering , nanotechnology , chemistry , beam (structure) , composite material , oceanography , engineering , chromatography , quantum mechanics , electron , physics , organic chemistry , geology
Alkali-antimonide photocathodes were grown on Si(100) and studied by means of XPS and UHV-AFM to validate the growth procedure and morphology of this material. The elements were evaporated sequentially at elevated substrate temperatures (first Sb, second K, third Cs). The generated intermediate K-Sb compound itself is a photocathode and the composition of K2.4Sb is close to the favored K3Sb stoichiometry. After cesium deposition, the surface layer is cesium enriched. The determined rms roughness of 25 nm results in a roughness domination of the emittance in the photoinjector already above 3 MV/m
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom