Demonstration of a 17-GHz, high-gradient accelerator with a photonic-band-gap structure.

نویسندگان

  • Evgenya I Smirnova
  • Amit S Kesar
  • Ivan Mastovsky
  • Michael A Shapiro
  • Richard J Temkin
چکیده

We report the testing of a high gradient electron accelerator with a photonic-band-gap (PBG) structure. The photonic-band-gap structure confines a fundamental TM(01)-like accelerating mode, but does not support higher-order modes (HOM). The absence of HOM is a major advantage of the PBG accelerator, since it suppresses dangerous beam instabilities caused by wakefields. The PBG structure was designed as a triangular lattice of metal rods with a missing central rod forming a defect confining the TM(01)-like mode and allowing the electron beam to propagate along the axis. The design frequency of the six-cell structure was 17.14 GHz. The PBG structure was excited by 2 MW, 100 ns pulses. A 16.5 MeV electron beam was transmitted through the PBG accelerator. The observed electron beam energy gain of 1.4 MeV corresponds to an accelerating gradient of 35 MV/m, in excellent agreement with theory.

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عنوان ژورنال:
  • Physical review letters

دوره 95 7  شماره 

صفحات  -

تاریخ انتشار 2005