Development of High-Current Sheet Beam Cathodes for Terahertz Sources

Author

Li, Lili ; Wang, Yiman ; Liu, Wei ; Wang, Yanchun ; Wang, Jinshu ; Srivastava, Anurag ; So, Jin-Kyu ; Park, Gun-Sik

Author_Institution

Sch. of Mater. Sci. & Eng., Beijing Univ. of Technol., Beijing

Volume

56

Issue

5

fYear

2009

fDate

5/1/2009 12:00:00 AM

Firstpage

762

Lastpage

768

Abstract

Generation of a sheet beam directly from a scandia-doped dispenser cathode has been investigated and optimized by means of beam-profile simulations and measurements. Rectangular beams 600 mum wide and 100 mum thick with current densities over 50 A/cm² have been generated. The beams are stable for at least several hundred hours with the cathodes operating at 950degC_b, making them promising candidates for application in the next generation of terahertz vacuum electron devices such as a 0.5-THz superradiant Smith-Purcell radiation source.

Keywords

cathodes; scandium compounds; terahertz wave devices; terahertz wave generation; thermionic cathodes; vacuum tubes; Smith-Purcell radiation source; beam-profile simulations; high-current sheet beam cathodes; rectangular electron beams; scandia-doped dispenser cathode; sheet beam generation; size 100 mum; size 600 mum; temperature 950 degC; terahertz sources; terahertz vacuum electron devices; Cathodes; Current density; Electron beams; Electron devices; Electron optics; Materials science and technology; Optical devices; Submillimeter wave technology; Temperature; Tungsten; High current density; Smith–Purcell radiation sources; scandate cathode; sheet beam; terahertz;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/TED.2009.2015414

Filename

4806087