Production of magnetized electron beam from a DC high voltage photogun

Conference · Sun Jul 01 00:00:00 EDT 2018

DOI:https://doi.org/10.18429/JACoW-IPAC2018-THPMK108· OSTI ID:1471199

Al Mamun, Md Abdullah ^[1]; Adderley, Philip A. ^[1]; Benesch, Jay F. ^[1]; Bullard, Bubba ^[1]; Delayen, Jean R. ^[2]; Grames, Joseph M. ^[1]; Guo, Jiquan ^[1]; Hannon, Fay E. ^[1]; Hansknecht, John C. ^[1]; Hernandez-Garcia, Carlos ^[1]; Kazimi, Reza ^[1]; Krafft, Geoffrey A. ^[1]; Poelker, Matt ^[1]; Suleiman, Riad S. ^[1]; Tiefenback, Michael G. ^[1]; Wang, Yan ^[2]; Zhang, Shukui ^[1]; Wijethunga, Sajini ^[3]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Old Dominion Univ., Norfolk, VA (United States)
3. Old Dominion Univ., Norfolk, VA (United States)

Bunched-beam electron cooling is a key feature of all proposed designs of the future electron-ion collider, and a requirement for achieving the highest promised collision luminosity. At the Jefferson Lab Electron Ion Collider (JLEIC), fast cooling of ion beams will be accomplished via so-called 'magnetized cooling' implemented using a recirculator ring that employs an energy recovery linac. In this contribution, we describe the production of magnetized electron beam using a compact 300 kV DC high voltage photogun with an inverted insulator geometry, and using alkali-antimonide photocathodes. Beam magnetization was assessed using a modest diagnostic beamline that includes YAG view screens used to measure the rotation of the electron beamlet passing through a narrow upstream aperture. Magnetization results are presented for different gun bias voltages and for different laser spot sizes at the photocathode, using 532 nm lasers with DC and RF time structure. Photocathode lifetime was measured at currents up to 4.5 mA, with and without beam magnetization.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1471199
• Report Number(s): JLAB-ACC-18-2810; DOE/OR/23177-4537
• Country of Publication: United States
• Language: English