The Experts below are selected from a list of 141 Experts worldwide ranked by ideXlab platform

Claudio Paoloni - One of the best experts on this subject based on the ideXlab platform.

  • Photonic Crystal-Coupler for Sheet Beam THz Vacuum Electron Tubes
    IEEE Electron Device Letters, 2016
    Co-Authors: Rosa Letizia, Mauro Mineo, Claudio Paoloni
    Abstract:

    Photonic crystal (PhC) technology was recently proposed as a compact and effective solution to improve the performance and ease the fabrication of terahertz vacuum Electron devices. In particular, the introduction of defects in a bi-dimensional, all metallic PhC provides very effective transmission of the useful signal in a compact input/output coupler where a novel tunnel for sheet-beam injection/collection is realized. Simulation results are experimentally validated here via measurements on a Ku-band scaled model of the PhC-coupler, which confirm the validity of the concept.

  • Vacuum Electron Tubes for THz applications
    2011 XXXth URSI General Assembly and Scientific Symposium, 2011
    Co-Authors: Claudio Paoloni, Mauro Mineo, Aldo Di Carlo
    Abstract:

    Vacuum devices, such as TWTs and BWOs, for THz regime, represent a new challenge in vacuum Electronics. Structures with dimensions in the range of microns are required to optimize the energy transfer from an Electron beam to the RF field. The availability of codes to accurately analyze micro slow-wave structures at THz frequency is fundamental for a reliable and fast design. A procedure to design a THz backward-wave oscillator based on an analytical code to compute the cold parameters in backward-wave mode and 3-D electromagnetic codes for device performance is presented. An output power of 190 mW is demonstrated at 1027 GHz.

Mauro Mineo - One of the best experts on this subject based on the ideXlab platform.

  • Photonic Crystal-Coupler for Sheet Beam THz Vacuum Electron Tubes
    IEEE Electron Device Letters, 2016
    Co-Authors: Rosa Letizia, Mauro Mineo, Claudio Paoloni
    Abstract:

    Photonic crystal (PhC) technology was recently proposed as a compact and effective solution to improve the performance and ease the fabrication of terahertz vacuum Electron devices. In particular, the introduction of defects in a bi-dimensional, all metallic PhC provides very effective transmission of the useful signal in a compact input/output coupler where a novel tunnel for sheet-beam injection/collection is realized. Simulation results are experimentally validated here via measurements on a Ku-band scaled model of the PhC-coupler, which confirm the validity of the concept.

  • Vacuum Electron Tubes for THz applications
    2011 XXXth URSI General Assembly and Scientific Symposium, 2011
    Co-Authors: Claudio Paoloni, Mauro Mineo, Aldo Di Carlo
    Abstract:

    Vacuum devices, such as TWTs and BWOs, for THz regime, represent a new challenge in vacuum Electronics. Structures with dimensions in the range of microns are required to optimize the energy transfer from an Electron beam to the RF field. The availability of codes to accurately analyze micro slow-wave structures at THz frequency is fundamental for a reliable and fast design. A procedure to design a THz backward-wave oscillator based on an analytical code to compute the cold parameters in backward-wave mode and 3-D electromagnetic codes for device performance is presented. An output power of 190 mW is demonstrated at 1027 GHz.

Rosa Letizia - One of the best experts on this subject based on the ideXlab platform.

  • Photonic Crystal-Coupler for Sheet Beam THz Vacuum Electron Tubes
    IEEE Electron Device Letters, 2016
    Co-Authors: Rosa Letizia, Mauro Mineo, Claudio Paoloni
    Abstract:

    Photonic crystal (PhC) technology was recently proposed as a compact and effective solution to improve the performance and ease the fabrication of terahertz vacuum Electron devices. In particular, the introduction of defects in a bi-dimensional, all metallic PhC provides very effective transmission of the useful signal in a compact input/output coupler where a novel tunnel for sheet-beam injection/collection is realized. Simulation results are experimentally validated here via measurements on a Ku-band scaled model of the PhC-coupler, which confirm the validity of the concept.

M. Thumm - One of the best experts on this subject based on the ideXlab platform.

  • K-band vacuum Electron Tubes for materials processing: present and future
    Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524), 2002
    Co-Authors: M. Thumm, L. Feher
    Abstract:

    From the point of view of standard microwave technology at the frequencies 0.915 GHz and 2.45 GHz, the need for using higher ISM frequencies like 5.85 and 24.15 GHz for materials processing applications has to be carefully verified with respect to special physical/engineering advantages or to limits the standard technology meets for the specific problem. Costs evaluation of industrial millimeter (mm)-wave systems have to be competitive, not only to conventional heating, but also to standard microwave solutions. The most important issue here is the availability of mm-wave generators appropriate in power, size and efficiency. The present paper reports on the state-of-the-art and future of modern 24.15 GHz sources like magnetron, extended interaction oscillator, klystron and gyrotron for industrial processing of materials.

  • Powerful vacuum Electron Tubes used in European particle accelerators and thermonuclear fusion systems
    Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524), 2002
    Co-Authors: M. Thumm
    Abstract:

    This paper reports on high-power RF Tubes used in different types of European particle accelerators and magnetic confinement fusion plasma devices like tokamaks and stellarators.

V Zikeš - One of the best experts on this subject based on the ideXlab platform.

  • Residual gases in Electron Tubes after storage
    Vacuum, 2004
    Co-Authors: V Zikeš
    Abstract:

    The composition of residual gases in Electron Tubes with impregnated cathodes was measured with the aid of an omegatron residual gas analyzer during operation after preparation and after storage. When stored Electron Tubes are switched on a considerable pressure increase occurs. It was found that hydrogen is the main component of the residual gases under these conditions. The partial pressure increase of hydrogen after switching on is about 14 times faster after storage than after preparation. It is supposed that hydrogen originates from an evaporated barium film from the cathode deposited on the inner surface of the anode. The barium film on the anode getters residual gases during storage and when the Electron tube is switched on, hydrogen is released due to higher temperature and Electron bombardment. The hydrogen was released at a rate of 1 × 10 −7 litre torr/sec. This value is compared with known parameters of the barium film.