PAC2013 - List of Authors (Liu, W.)

Paper	Title	Page
TUPSM05	Studies of Field and Photo-Emission in a New Short-Pulse, High-Charge Cs2Te RF Photocathode Gun	637
	E.E. Wisniewski, M.E. Conde, W. Gai, C.-J. Jing, W. Liu, J.G. Power ANL, Argonne, USA C.-J. Jing Euclid TechLabs, LLC, Solon, Ohio, USA L.K. Spentzouris, Z.M. Yusof Illinois Institute of Technology, Chicago, Illinois, USA
	Funding: This work was funded by the U.S. Dept. of Energy Office of Science under contract number Agency DE-AC02-06CH11357. A new high-charge RF gun is now operating at the Argonne Wakefield Accelerator (AWA) facility at Argonne National Laboratory (ANL). The 1.5 cell 1.3 GHz gun uses a Cesium telluride photocathode driven with a 248 nm laser to provide short-pulse, high charge electron beams for the new 75 MeV drive beamline. The high-gradient RF gun (peak field on the cathode > 80MV/m) is a key piece of the facility upgrade (see M. E. Conde, this proceedings). The large Cs2Te photocathode (diameter > 30 mm) is fabricated in-house. The photo-injector generates high-charge, short pulse, single bunches (Q > 100 nC) or bunch-trains (Q > 1000 nC) for wakefield experiments, typically involving dielectric-loaded accelerating structures. Field-emitted dark current from the Cs2Te cathode was measured during RF conditioning. Fowler-Nordheim plots of the data are presented and compared to similar measurements made using a copper cathode in the initial phase of conditioning. Results of quantum efficiency (QE) studies are presented with the cathode operating in both single and bunch-train modes.

Paper

Title

Page

Studies of Field and Photo-Emission in a New Short-Pulse, High-Charge Cs2Te RF Photocathode Gun

637

E.E. Wisniewski, M.E. Conde, W. Gai, C.-J. Jing, W. Liu, J.G. Power
ANL, Argonne, USA
C.-J. Jing
Euclid TechLabs, LLC, Solon, Ohio, USA
L.K. Spentzouris, Z.M. Yusof
Illinois Institute of Technology, Chicago, Illinois, USA

Funding: This work was funded by the U.S. Dept. of Energy Office of Science under contract number Agency DE-AC02-06CH11357.
A new high-charge RF gun is now operating at the Argonne Wakefield Accelerator (AWA) facility at Argonne National Laboratory (ANL). The 1.5 cell 1.3 GHz gun uses a Cesium telluride photocathode driven with a 248 nm laser to provide short-pulse, high charge electron beams for the new 75 MeV drive beamline. The high-gradient RF gun (peak field on the cathode > 80MV/m) is a key piece of the facility upgrade (see M. E. Conde, this proceedings). The large Cs2Te photocathode (diameter > 30 mm) is fabricated in-house. The photo-injector generates high-charge, short pulse, single bunches (Q > 100 nC) or bunch-trains (Q > 1000 nC) for wakefield experiments, typically involving dielectric-loaded accelerating structures. Field-emitted dark current from the Cs2Te cathode was measured during RF conditioning. Fowler-Nordheim plots of the data are presented and compared to similar measurements made using a copper cathode in the initial phase of conditioning. Results of quantum efficiency (QE) studies are presented with the cathode operating in both single and bunch-train modes.