Electron Guns for Terahertz Vacuum Electron （电子枪支太赫兹真空电子）.pdf

Terahertz Science and Technology, ISSN 1941-7411 Vol.4, No.4, December 2011 Invited Paper Electron Guns for Terahertz Vacuum Electron Sources * R. Lawrence Ives , George Collins, Michael Read, George Miram, David Marsden Calabazas Creek Research Inc., 690 Port Drive, San Mateo, CA 94404 USA * Email: RLI@C (Received September 22, 2011) Abstract: Advanced techniques are allowing fabrication of high frequency RF circuits to high precision. Dimensional tolerances of a few microns are routinely achieved, allowing precise fabrication at frequencies approaching, and sometimes exceeding, 1 THz. Fabrication is usually performed by computer-controlled machines, often without human intervention. A more challenging task, however, is fabrication and assembly of electron guns operating at thousands of volts and temperatures often exceeding 1000℃. Electron gun assembly, especially for thermionic guns, is still primarily a manual process. Because the electron gun operates at a high negative potential, it is necessary to electrically isolate the gun from the RF circuit, requiring one or more bonding processes, which usually include brazing or welding. A further complication is integrating the electron gun and circuit with a magnetic field providing beam confinement. Precise alignment is required to achieve adequate beam transmission. Again, this alignment is typically a manual procedure. This publication identifies the issues associated with the design, fabrication, assembly, and integration of high voltage thermionic