Combined thermionic and photoelectric emission from dispenser cathodes

Author

Feldman, D.W. ; Valfells, A. ; Neumann, J. ; Harris, J. ; Beaudoin, B. ; O´Shea, P.G. ; Virgo, M.

Author_Institution

Inst. Res. in Electron. & Appl. Phys., Maryland Univ., College Park, MD, USA

Volume

3

fYear

2001

fDate

2001

Firstpage

2132

Abstract

Photoelectric emission from dispenser cathodes has been studied earlier. Photoelectric emission in conjunction with themionic emission can provide a convenient and flexible means of modulating emission from thermionic cathodes with programmable formats and high bandwidth. This may be useful for experimental studies the beam dynamics of space charge dominated beams, such as in the University of Maryland electron ring (UMER). We have studied combined photoelectric and thermionic emission from a dispenser cathode using a nitrogen laser operating at 337 nm. Results will be presented for the effect on emission of laser intensity, cathode temperature, and accelerating voltage

Keywords

electron accelerators; particle beam dynamics; particle beam injection; photoemission; storage rings; thermionic cathodes; thermionic electron emission; 337 nm; N; UMER; University of Maryland electron ring; beam dynamics; combined thermionic/photoelectric emission; dispenser cathodes; high bandwidth; photoinjectors; programmable formats; space charge dominated beams; thermionic cathodes; Bandwidth; Cathodes; Electron beams; Laser beams; Modulation coding; Nitrogen; Ring lasers; Space charge; Temperature; Thermionic emission;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001

Conference_Location

Chicago, IL

Print_ISBN

0-7803-7191-7

Type

conf

DOI

10.1109/PAC.2001.987300

Filename

987300