Fabrication and low-power RF test of C-band RF gun

By a News Reporter-Staff News Editor at Physics Week -- 
http://www.hispanicbusiness.com/2014/8/14/investigators_from_national_institute_of_advanced.htm

Current study results on Nuclear Physics have been published. According to news reporting originating in Ibaraki, Japan, by VerticalNews journalists, research stated, "A C-band RF gun for compact radiation sources such as high-energy X-ray and terahertz radiation sources is developed at AIST and is designed to work at a frequency of 5.3 GHz."

The news reporters obtained a quote from the research from the National Institute of Advanced Industrial Science and Technology (NIAIST), "The total length of this equipment is about 1.5 m. An electron beam with a maximum energy of 0.9 MeV can be generated when the peak electric field is 85 MV/m, corresponding to an RF peak power of 600 kW. A coniferous-tree-type carbon nanostructure is used for the field emission cathode."

According to the news reporters, the research concluded: "We present the structural design and fabrication of the C-band RF cavity and a low-power RF test of it."

For more information on this research see: Fabrication and low-power RF test of C-band RF gun. Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms, 2014;331():27-30. Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands.
Our news correspondents report that additional information may be obtained by contacting Y. Taira, Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan. Additional authors for this research include R. Kuroda, M. Tanaka, H. Kato, R. Suzuki and H. Toyokawa.

Abstract-Radially polarized terahertz waves from a photoconductive antenna with microstructures

http://apl.aip.org/resource/1/applab/v102/i22/p221118_s1?isAuthorized=no

K. Kan¹, J. Yang¹, A. Ogata¹, S. Sakakihara¹, T. Kondoh¹, K. Norizawa¹, I. Nozawa¹, T. Toigawa¹, Y. Yoshida¹, H. Kitahara², K. Takano², M. Hangyo², R. Kuroda³, and H. Toyokawa³

¹Institute of Scientific and Industrial Research (ISIR), Osaka University, Osaka 567-0047, Japan
²Institute of Laser Engineering (ILE), Osaka University, Osaka 565-0871, Japan
³National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki 305-8568, Japan                        

The generation of radially polarized terahertz (THz) waves from a photoconductive antenna (PCA) with radial microstructures was investigated. Microstructured electrodes with 10 μm lines and spaces were fabricated on a semi-insulating InP wafer using photolithography. The PCA with three layers was driven by an amplified femtosecond laser and DC power supply. Radially polarized THz waves from the PCA were measured by a Michelson interferometer with a 4.2 K silicon bolometer. The polarization components of THz waves were analyzed by a wire grid polarizer.

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