Author: Qiu, J.Q.
Paper Title Page
THPMW040 Multipactor Discharge in a Resonator as an Active Switch for RF Pulse Compression 3640
 
  • J.Q. Qiu, S.P. Antipov, C.-J. Jing, A. Kanareykin
    Euclid Beamlabs LLC, Bolingbrook, USA
  • E.V. Ilyakov, I.S. Kulagin, S.V. Kuzikov, A.A. Vikharev
    IAP/RAS, Nizhny Novgorod, Russia
 
  Funding: Phase I DOE SBIR
Pulse compression is a method of increasing the peak power of the microwave pulse at the expense of its length. Over the years a number of pulse compressors had been demonstrated with some being bulky but efficient, like the binary pulse compressor and other being compact but less efficient, like SLED-II. An active pulse compressor had been proposed to increase the efficiency and compression ratio which relies on a high power active switch. Currently there are no practical switches that can work reliably with 100 s of megawatts of power. Most of the switches (ferroelectric, plasma-based, semiconductor) are limited by the breakdown strength of various dielectric inserts. In this paper we report on an active switch development which is based on a pure copper resonator and controlled by a single-side multipactor discharge at a metallic wall in the presence of a resonant DC magnetic field and a normal to metal rf field. The discharge is ignited by external rf power produced by inexpensive 2.45 GHz, 1-5 kW magnetrons.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW040  
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WEPOY025 High Power RF Generation From a W-Band Corrugated Structure Excited by a Train of Electron Bunches 3040
SUPSS062   use link to see paper's listing under its alternate paper code  
 
  • D. Wang, C.-X. Tang
    TUB, Beijing, People's Republic of China
  • S.P. Antipov, C.-J. Jing, J.Q. Qiu
    Euclid TechLabs, LLC, Solon, Ohio, USA
  • M.E. Conde, D.S. Doran, W. Gai, G. Ha, G. Ha, W. Liu, J.G. Power, E.E. Wisniewski
    ANL, Argonne, Illinois, USA
  • V.A. Dolgashev
    SLAC, Menlo Park, California, USA
 
  We report on the generation of multi-megawatt peak RF power at 91textGHz, using an ultrarelativistic electron bunch train to excite electromagnetic fields in a high-impedance metallic corrugated structure. This device can be used as a power source for high gradient acceleration of electrons. To achieve precise control of the wakefield phase, a long range wakefield interferometry method was developed in which the RF energy due to the interference of the wakefields from two bunches was measured as a function of the bunch separation.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY025  
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WEPOY026 Simulation and Measurement of the Beam Breakup Instability in a W-band Corrugated Structure 3044
 
  • D. Wang, C.-X. Tang
    TUB, Beijing, People's Republic of China
  • S.P. Antipov, C.-J. Jing, J.Q. Qiu
    Euclid TechLabs, LLC, Solon, Ohio, USA
  • M.E. Conde, D.S. Doran, W. Gai, G. Ha, W. Liu, J.G. Power, E.E. Wisniewski
    ANL, Argonne, Illinois, USA
 
  The corrugated wakefield structure has wide application in electron beam energy manipulation and high frequency RF radiation generation. The transverse wakefield which cause beam breakup (BBU) instability is excited when the drive beam is not perfectly centered through the structure. Here we report on the numerical and experimental investigation of the BBU effect in a W-band corrugated structure, for both cases of short range wakefield and long range wakefield. In the numerical part we develop a point to point (P2P) code that allows rapid and efficiency simulations of the beam dynamics effect by wakefield, which is based on the the particle-wake function coupled dynamics equation of motion. And the experimental measurements of BBU effect are found to be in good agreement with the simulations.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY026  
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