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Title: Magnetized Electron Source for JLEIC Electron Cooler

Abstract

Bunched-beam electron cooling is a key feature of all proposed designs of the future electron-ion collider, and a requirement for achieving the specified collision luminosity. For 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 alkali-antimonide photocathodes. Beam magnetization was assessed using a modest diagnostic beamline that includes YAG view screens for measuring the rotation angle of the electron beamlet passing through a narrow upstream slit. Magnetization characterization including drift emittance were measured for various gun bias voltages and laser spot sizes at the photocathode using 532 nm lasers with DC and RF time structure. With magnetized beam, photocathode lifetime at currents up to 28 mA CW was measured and high bunch charge up to 700 pC was demonstrated.

Authors:
 [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [2];  [1]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. Old Dominion Univ., Norfolk, VA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1483676
Report Number(s):
JLAB-ACC-18-2851; DOE/OR/23177-4595
R&D Project: 2018-LDRD-5
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: Photocathode Physics for Photoinjectors Workshop, Santa Fe, NM, October 15 – 17, 2018
Country of Publication:
United States
Language:
English

Citation Formats

Mamun, Md Abdullah, Adderley, Philip, Benesch, Jay, Bullard, Donald, Grames, Joseph, Guo, Jiquan, Hannon, Fay, Hansknecht, John, Hernandez-Garcia, Carlos, Kazimi, Reza, Krafft, Geoffrey A., Poelker, Matt, Suleiman, Riad S., Tiefenback, Michael G., Wang, Yan, Zhang, Shukui, Delayen, Jean R., and Wijethunga, W M Sajini. Magnetized Electron Source for JLEIC Electron Cooler. United States: N. p., 2018. Web.
Mamun, Md Abdullah, Adderley, Philip, Benesch, Jay, Bullard, Donald, Grames, Joseph, Guo, Jiquan, Hannon, Fay, Hansknecht, John, Hernandez-Garcia, Carlos, Kazimi, Reza, Krafft, Geoffrey A., Poelker, Matt, Suleiman, Riad S., Tiefenback, Michael G., Wang, Yan, Zhang, Shukui, Delayen, Jean R., & Wijethunga, W M Sajini. Magnetized Electron Source for JLEIC Electron Cooler. United States.
Mamun, Md Abdullah, Adderley, Philip, Benesch, Jay, Bullard, Donald, Grames, Joseph, Guo, Jiquan, Hannon, Fay, Hansknecht, John, Hernandez-Garcia, Carlos, Kazimi, Reza, Krafft, Geoffrey A., Poelker, Matt, Suleiman, Riad S., Tiefenback, Michael G., Wang, Yan, Zhang, Shukui, Delayen, Jean R., and Wijethunga, W M Sajini. Mon . "Magnetized Electron Source for JLEIC Electron Cooler". United States. https://www.osti.gov/servlets/purl/1483676.
@article{osti_1483676,
title = {Magnetized Electron Source for JLEIC Electron Cooler},
author = {Mamun, Md Abdullah and Adderley, Philip and Benesch, Jay and Bullard, Donald and Grames, Joseph and Guo, Jiquan and Hannon, Fay and Hansknecht, John and Hernandez-Garcia, Carlos and Kazimi, Reza and Krafft, Geoffrey A. and Poelker, Matt and Suleiman, Riad S. and Tiefenback, Michael G. and Wang, Yan and Zhang, Shukui and Delayen, Jean R. and Wijethunga, W M Sajini},
abstractNote = {Bunched-beam electron cooling is a key feature of all proposed designs of the future electron-ion collider, and a requirement for achieving the specified collision luminosity. For 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 alkali-antimonide photocathodes. Beam magnetization was assessed using a modest diagnostic beamline that includes YAG view screens for measuring the rotation angle of the electron beamlet passing through a narrow upstream slit. Magnetization characterization including drift emittance were measured for various gun bias voltages and laser spot sizes at the photocathode using 532 nm lasers with DC and RF time structure. With magnetized beam, photocathode lifetime at currents up to 28 mA CW was measured and high bunch charge up to 700 pC was demonstrated.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {10}
}

Conference:
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