Journal Article

PUBDB-2022-01032

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Direct Measurement of Photocathode Time Response in a High-Brightness Photoinjector

Loisch, G. (Corresponding author)DESY* ; Chen, Y. L.DESY* ; Koschitzki, C.DESY* ; Qian, H.DESY* ; Gross, M.DESY* ; Hannah, A. ; Hoffmann, A.XFEL.EU*DESY* ; Kalantaryan, D.DESY* ; Krasilnikov, M.DESY* ; Lederer, S.DESY* ; Li, X.DESY* ; Lishilin, O.DESY* ; Melkumyan, D.DESY* ; Monaco, L.INFN* ; Niemczyk, R.DESY* ; Oppelt, A.DESY* ; Sertore, D.INFN* ; Stephan, F.DESY* ; Valizadeh, R. ; Vashchenko, G.DESY* ; Weilbach, T.DESY*

2022
American Inst. of Physics Melville, NY

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Please use a persistent id in citations: doi:10.1063/5.0078927  doi:10.3204/PUBDB-2022-01032

Abstract: Electron photoinjectors provide high-brightness electron beams to numerous research applications in physics, chemistry, material, and life sciences. Semiconductor photocathodes are widely used here, as they enable the production of low-emittance beams with variable charge at high repetition rates. One of the key figures of merit of photocathodes is the minimum achievable bunch length. In semiconductor cathodes, this is dominated by scattering effects and varying penetration depths of the extracting photons, which leads to a characteristic electron emission function. We present a method to determine this cathode time response with resolution on the tens of femtoseconds level, breaking the resolution barrier encountered in previous studies. The method is demonstrated with cesium-telluride (Cs$_2$Te) and gold cathodes, revealing response times of (184 ± 41) fs up to (253 ± 58) fs for the semiconductor and an upper limit of (93 ± 17) fs for the metal. Monte Carlo simulations of Cs$_2$Te emission benchmarked to these results give detailed information about the cathode material.

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Contributing Institute(s):

1. Technologie (Z_PITZ)
2. Injektion (MIN)
3. Vakuumsysteme (MVS)
4. Koordination des XFEL-Beschleunigers (MXL)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)

Experiment(s):

1. Photo Injector Test Facility

Appears in the scientific report 2022

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; PubMed Central ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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