Generation and characterization of magnetized electron beam from a DC high voltage photogun for electron beam cooling application

Wijethunga, S. A.K.; Mamun, M. A.; Suleiman, R.; Adderley, P.; Bullard, B.; Benesch, J.; Delayen, J. R.; Grames, J.; Hernandez-Garcia, C.; Hannon, F.; Krafft, G. A.; Palacios-Serrano, G.; Poelker, M.; Stefani, M.; Wang, Y.; Zhang, S.

doi:10.1016/j.nima.2023.168194

Generation and characterization of magnetized electron beam from a DC high voltage photogun for electron beam cooling application

Journal Article · Thu Mar 09 00:00:00 EST 2023 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2023.168194· OSTI ID:1960494

^[1]; Mamun, M. A. ^[2]; ^[2]; Adderley, P. ^[2]; Bullard, B. ^[2]; Benesch, J. ^[2]; Delayen, J. R. ^[1]; Grames, J. ^[2]; Hernandez-Garcia, C. ^[2]; Hannon, F. ^[2]; Krafft, G. A. ^[1]; Palacios-Serrano, G. ^[2]; ^[2]; Stefani, M. ^[3]; Wang, Y. ^[2]; Zhang, S. ^[2]

Old Dominion University, Norfolk, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Old Dominion University, Norfolk, VA (United States)

One of the most challenging requirements for the proposed Electron-Ion Collider is the strong cooling of the proton beam, which is key to achieving the collider’s desired luminosity of order 10³³-10³⁴ cm^-2 s^-1. Magnetized bunched-beam electron cooling could be a means to achieve the required high luminosity, where strong cooling is accomplished inside a cooling solenoid where the ions co-propagate with an electron beam generated from a source immersed in a magnetic field. To increase the cooling efficiency, a bunched electron beam with high bunch charge and high repetition rate is required. This work describes the production and characterization of magnetized electron beam using a compact 300 kV DC high voltage photogun and bi-alkali antimonide photocathode. Beam magnetization was studied using a diagnostic beamline that includes viewer screens for measuring the shearing angle of the electron beamlet passing through a narrow upstream slit. Simulations and corresponding measurements of beam magnetization are presented as a function of laser spot size and magnetic field strength. Correlated beam emittance with magnetic field (0–0.15 T) at the photocathode was measured for various laser spot sizes. Measurements of photocathode lifetime were carried out at different magnetized electron beam currents up to 28 mA, and bunch charge up to 0.7 nC (not simultaneously).

View Accepted Manuscript (DOE)

Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 1960494

Report Number(s):: DOE/OR/23177-5544; JLAB-ACC-22-3665

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment Vol. 1051; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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