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Krawczyk, F.L.

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TUP108 Initial RF Measurements of the CW Normal-Conducting RF Injector 656
 
  • D.C. Nguyen, G.O. Bolme, F.L. Krawczyk, F.A. Martinez, N.A. Moody, K.A. Young
    LANL, Los Alamos, New Mexico
  • L.M. Young
    AES, Medford, NY
 
 

Funding: This work is supported by ONR and HEL-JTO.
The LANL/AES 2.5-cell, normal-conducting radio-frequency (NCRF) injector has been fabricated. This room-temperature injector can be used to generate cw electron beams with average current greater than 100 mA and beam energy up to 2.5 MeV prior to injection into an energy-recovery linac. PARMELA simulations show the effectiveness of emittance compensation in generating high-brightness electron beams at relatively low accelerating gradients. We present the initial measurement results of the rf, accelerator and vacuum properties of the NCRF injector and the associated ridge-loaded waveguides. The impact of these rf measurement results on the planned thermal and electron beam tests will also be discussed.

 
THP037 RF Design of a Spoke Resonator for High Power Free-Electron Lasers 866
 
  • F.L. Krawczyk, D.C. Nguyen
    LANL, Los Alamos, New Mexico
  • S.J. Cooke
    NRL, Washington, DC
  • B. Rusnak
    LLNL, Livermore, California
  • T.I. Smith
    Stanford University, Stanford, Califormia
  • E.L. Wright
    Beam-Wave Research, Inc., Union City
 
 

Funding: Supported by the High-Energy Laser Joint Technology Office
We are investigating spoke resonators that originally were proposed for moderate energy proton acceleration for application in high-average-current free-electron lasers (FEL). This structure holds the promise of alleviating the BBU limitations of conventional rf structures. Spoke resonator have several advantages: 1) strong coupling simplifies the access to higher order modes (HOM), 2) at the same frequency a spoke resonator is about half the size of an elliptical resonator, 3) the spokes provide additional mechanical stability and stiffening , 4) the power and HOM couplers can be attached to the cavity body and do not take up additional space along the length of the accelerator, 5) the presence of the spokes limits the polarizations of the HOMs to two orientations which facilitates the selection of HOM coupler positions. The rf performance of a spoke resonator specifically designed for high-current electron applications (beta=1.0) will be presented and compared with the expected performance of elliptical resonators designed for such applications. Besides the structure's effectiveness for acceleration also HOM properties will be presented.

 

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