83 citations · 241 across the 12 of their papers we have counts for
13 papers
Non-Adiabatic Effects on Electron Beam Quality for Frequency-Tunable Gyrotrons
Cheng-Hung Tsai, Tsun-Hsu Chang, Toshitaka Idehara +1
We propose an unconventional electron gun structure in which the emitter is located on a concave cathode surface with a non-uniform electric field. Such a design violates the intui…
First results from a hidden photon dark matter search in the meV sector using a plane-parabolic mirror system
Stefan Knirck, Takayuki Yamazaki, Yoshiki Okesaku +3
We report on the first results from a new dish antenna search for hidden photon dark matter (HPDM) in the meV mass region. A double mirror system composed of a plane and a paraboli…
Gyrotrons for High-Power Terahertz Science and Technology at FIR UF
Toshitaka Idehara, Svilen Petrov Sabchevski
In this paper, we present the recent progress in the development of a series of gyrotrons at FIR UF that have opened the road to many novel applications in the high-power Terahertz…
Finite-Bandwidth Resonances of High-Order Axial Modes (HOAM) in a Gyrotron Cavity
Svilen Sabchevski, Toshitaka Idehara
Finite-bandwidth resonances of high-order axial modes (HOAM) in an open gyrotron cavity are studied numerically using the GYROSIM problem-oriented software package for modelling, s…
First Millimeter-wave Spectroscopy of the Ground-state Positronium
A. Miyazaki, T. Yamazaki, T. Suehara +7
We report on the first measurement of the Breit-Wigner resonance of the transition from {\it ortho-}positronium to {\it para-}positronium. We have developed an optical system to ac…
A Dual-Beam Irradiation Facility for a Novel Hybrid Cancer Therapy
Svilen Sabchevski, Toshitaka Idehara, Shintaro Ishiyama +2
In this paper we present the main ideas and discuss both the feasibility and the conceptual design of a novel hybrid technique and equipment for an experimental cancer therapy base…