Title :
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
fDate :
5/1/2009 12:00:00 AM
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 950degCb, 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;
Journal_Title :
Electron Devices, IEEE Transactions on
DOI :
10.1109/TED.2009.2015414
