Keyword: multipactoring
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WEPMA007 Experimental Study of Multipactor Suppression in Dielectric Materials electron, vacuum, Windows, target 2753
 
  • M. El Khaldi, W. Kaabi
    LAL, Orsay, France
  
  A novel coaxial resonator to investigate two-surface multipactor discharges on metal and dielectric surfaces in the gap region under vacuum conditions (~10-8 mbar) has been designed and tested. The resonator is ~ 100 mm in length with an outer diameter of ~ 60 mm (internal dimensions). A pulsed RF source delivers up to 30 W average power over a wide frequency range 650-900 MHz to the RF resonator. The incident and reflected RF signals are monitored by calibrated RF diodes. An electron probe provides temporal measurements of the multipacting electron current with respect to the RF pulses. In this paper we compare and contrast the results from the RF power tests of the alumina (97.6% Al2O3) and quartz samples without a coating, “the non-coated samples” and the Alumina and quartz samples with a thick TiN coating in order to evaluate a home made sputtered titanium nitride (TiN) thin layers as a Multipactor suppressor. The effectiveness of this method is presented and discussed in the paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMA007  
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WEPMA053 Multipactor Simulations in 325 MHz Superconducting Spoke Cavity for an Electron Accelerator cavity, electron, simulation, laser 2892
 
  • T. Kubo, T. Saeki
    KEK, Ibaraki, Japan
  • E. Cenni, Y. Iwashita, H. Tongu
    Kyoto ICR, Uji, Kyoto, Japan
  • R. Hajima, M. Sawamura
    JAEA, Ibaraki-ken, Japan
  
  Funding: The work is supported by Photon and Quantum Basic Research Coordinated Development Program from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
In order to realize a compact industrial-use X-ray source with the laser-Compton scattering, a 325MHz superconducting spoke cavity for an electron accelerator operated at 4K is under development. After design-optimizations of the first cavity, we started fabrication process. In this paper, multipactor analyses carried out as parts of the design-optimization efforts are briefly summarized. Relations between cavity geometries and averaged secondary electron emission yield are discussed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMA053  
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WEPTY062 Multipactor Breakdown Modelling Using an Averaged Version of Furman's SEY Model simulation, electron, cavity, plasma 3419
 
  • S.A. Rice, J.P. Verboncoeur
    Michigan State University, East Lansing, Michigan, USA
  
  Funding: Work supported by a MSU Strategic Partnership Grant.
Furman's seconday electron yield model is commonly used for the simulation of multipactor in accelerating cavities and other resonant structures. While accurate, the stochastic model requires many Monte Carlo simulations in order to characterize susceptibility to multipactor. This paper generalizes our previous research in characterizing a reduced-order Furman model, in which we replace the stochastic Furman model with a deterministic model based upon the Furman model's underlying statistics. Favorable comparisons between the full Furman model and the reduced-order Furman model are shown for multipactor simulations in a coaxial cavity, and the results are expected to generalize to other geometries. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY062  
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