Space-Charge Dominated Photoemission in High Gradient Photocathode RF Guns

Chen, Ye; Boonpornprasert, Prach; Chen, Han; De Gersem, Herbert; Dohlus, Martin; Du, Yingchao; Gjonaj, Erion; Good, James; Groß, Matthias; Huang, Wenhui; Huck, Holger; Isaev, Igor; Kalantaryan, Davit; Koschitzki, Christian; Krasilnikov, Mikhail; Lishilin, Osip; Loisch, Gregor; Melkumyan, David; Niemczyk, Raffael; Oppelt, Anne; Qian, Houjun; Renier, Yves; Schmid, Steffen; Stephan, Frank; Tang, Chuanxiang; Tian, Qi; Yan, Lixin

doi:10.18429/JACoW-LINAC2018-THPO116

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RIS citation export for THPO116: Space-Charge Dominated Photoemission in High Gradient Photocathode RF Guns

TY  - CONF
AU  - Chen, Y.
AU  - Boonpornprasert, P.
AU  - Chen, H.
AU  - De Gersem, H.
AU  - Dohlus, M.
AU  - Du, Y. C.
AU  - Gjonaj, E.
AU  - Good, J.D.
AU  - Groß, M.
AU  - Huang, W.-H.
AU  - Huck, H.
AU  - Isaev, I.I.
AU  - Kalantaryan, D.K.
AU  - Koschitzki, C.
AU  - Krasilnikov, M.
AU  - Lishilin, O.
AU  - Loisch, G.
AU  - Melkumyan, D.
AU  - Niemczyk, R.
AU  - Oppelt, A.
AU  - Qian, H.J.
AU  - Renier, Y.
AU  - Schmid, S. A.
AU  - Stephan, F.
AU  - Tang, C.-X.
AU  - Tian, Q.L.
AU  - Yan, L.X.
ED  - Pei, Guoxi
ED  - Schaa, Volker RW
ED  - Chin, Yong Ho
ED  - Fu, Shinian
ED  - Zhao, Ning
TI  - Space-Charge Dominated Photoemission in High Gradient Photocathode RF Guns
J2  - Proc. of LINAC2018, Beijing, China, 16-21 September 2018
CY  - Beijing, China
T2  - Linear Accelerator Conference
T3  - 29
LA  - english
AB  - The cathode emission physics plays a crucial role in the overall beam dynamics in the gun. Interplays between intricate emission mechanisms in the cathode vicinity strongly influence the cathode quantum efficiency (QE) and the intrinsic emittance. The presence of strong space-charge effects in high gradient RF guns further complicates the emission process. A proper modeling of photoemission and a careful treatment of the space-charge contribution is thus of great necessity to understanding the formation of the beam slice emittance. In this article, emission measurements are carried out using the L-band cesium-telluride photocathode RF gun at the Photo Injector Test Facility at DESY in Zeuthen (PITZ) and the S-band copper photocathode RF gun at Tsinghua University. Following the Dowell model a simple so-called space-charge iteration approach is developed and used to determine the QE through temporal and spatial-dependent electromagnetic fields. An impact of the space-charge cooling on the thermal emittance is presented. Measurement data are shown and discussed in comparisons to preliminary simulation results.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 941
EP  - 944
KW  - cathode
KW  - space-charge
KW  - laser
KW  - emittance
KW  - gun
DA  - 2019/01
PY  - 2019
SN  - 2226-0366
SN  - 978-3-95450-194-6
DO  - DOI: 10.18429/JACoW-LINAC2018-THPO116
UR  - http://jacow.org/linac2018/papers/thpo116.pdf
ER  -