Cold electron beams from cryocooled, alkali antimonide photocathodes
نویسندگان
چکیده
منابع مشابه
Preparation and study of properties of a few alkali antimonide photocathodes
A new processing technique for a few alkali antimonide photocathodes is described. This technique does not require an initial antimony layer as in the conventional techniques. Electron microscopic examination of the antimony film shows that the antimony film is affected by ambient gases, and the improvement of senistivity which results in this technique is thought to be due to the absence of it...
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Alkali antimonide photocathodes are a strong contender for the cathode of choice for next-generation photon sources such as LCLS II or the XFEL. These materials have already found extensive use in photodetectors and image intensifiers. However, only recently have modern synchrotron techniques enabled a systematic study of the formation chemistry of these materials. Such analysis has led to the ...
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Here we present first measurements of the effect of roughness on the emittance of K2CsSb photocathodes under high fields. We show that for very thin cathodes the effect is negligible at up to 3 MV/m but for thicker and more efficient cathodes the effect becomes significant. We discuss ways to modify the deposition to circumvent this problem.
متن کاملField Emission Studies of Heat Treated Mo Substrates
Molybdenum can be used as a substrate for bi-alkali antimonide photocathodes utilized for the generation of high brightness electron beams in superconducting radio frequency (SRF) photoinjector cavities. Operation at high field strength is required to obtain a low emittance beam, thus increasing the probability of field emission (FE) from the cathode surface. Usually, substrates are heated in s...
متن کاملStructure of multialkali antimonide photocathodes studied by X-ray photoelectron spectroscopy
From a comparison of the relative intensities of photoelectrons with different escape depths for Na, K, CS, and Sb in several multialkali antimonide photocathodes covering a range of high photosensitivities, a model of the structure of these surfaces can be given. In particular, the results indicate for NazKSb(Cs), the S-20, a surface layer consisting of KzCsSb and NaKzSb-30 8, thick over a bas...
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ژورنال
عنوان ژورنال: Physical Review Special Topics - Accelerators and Beams
سال: 2015
ISSN: 1098-4402
DOI: 10.1103/physrevstab.18.113401