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Article
Characteristics of a Very High Energy Electron Beam in a Laser Wakefield Accelerator for Cancer Therapy
A cancer treatment device using a very high energy electron beam has been studied as a new radiation therapy method because of its deep penetration depth, dose characteristics that are better than those of the...
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Article
Characteristics of the Shock Structure for Transition Injection in Laser Wakefield Acceleration
In order to develop a stable and efficient laser wakefield accelerator by transition injection, the characteristics of the plasma density generated in a gas medium by shock was experimentally measured. The den...
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Article
Open AccessViolation of the transit-time limit toward generation of ultrashort electron bunches with controlled velocity chirp
Various methods to generate ultrashort electron bunches for the ultrafast science evolved from the simple configuration of two-plate vacuum diodes to advanced technologies such as nanotips or photocathodes exc...
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Article
Enhanced Continuous-Wave Terahertz Imaging with a Horn Antenna for Food Inspection
Continuous-wave (CW) terahertz (THz) imaging with a horn antenna is proposed to enhance the spatial resolution of a THz imaging system. The attached waveguide that is smaller than the wavelength can easily inc...
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Article
Two-Dimensional Terahertz Photonic Crystals Fabricated by Wet Chemical Etching of Silicon
The fabrication of two-dimensional terahertz photonic crystals using wet chemical etching of high-resistivity silicon is described. Wet-etched photonic crystals with a sloped sidewall were fabricated in 16 × 1...
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Article
High Speed Terahertz Pulse Imaging in the Reflection Geometry and Image Quality Enhancement by Digital Image Processing
We describe the formation and enhancement of two dimensional pulsed terahertz (THz) images obtained in the reflection geometry with a high-speed optical delay line. Two test objects are imaged and analyzed wit...
