Author: Tuzel, W.M.
Paper Title Page
THP202 First Operation of the LANL/AES Normal Conducting Radio Frequency Photoinjector 2498
 
  • N.A. Moody, H.L. Andrews, G.O. Bolme, L.J. Castellano, C.E. Heath, F.L. Krawczyk, S. Kwon, D. C. Lizon, P.S. Marroquin, F.A. Martinez, D.C. Nguyen, M.S. Prokop, R.M. Renneke, W. Roybal, P.A. Torrez, W.M. Tuzel, T. Zaugg
    LANL, Los Alamos, New Mexico, USA
  • L. Roybal
    TechSource, Santa Fe, New Mexico, USA
 
  Funding: We gratefully acknowledge funding from the Office of Naval Research (ONR) and the High Energy Laser Joint Technology Office (HEL-JTO).
The LANL/AES normal-conducting radio-frequency (NCRF) injector has undergone high power testing, confirming field gradients of up to 10 MV/m at the cathode. Most NCRF designs are limited to low-duty-factor operation to constrain rf power consumption and limit ohmic heat generation. This cavity structure utilizes high density micro-channel cooling to successfully remove heat with the option of dynamic temperature control to actively adjust cavity resonance. This first high power rf test demonstrated stable cw (100% duty cycle) operation using resonant frequency tracking and produced intentional dark current emission from a roughened cathode blank. Resulting end-point x-ray measurements confirm the cathode gradient of 9.8 ± 0.2 MV/m required for acceleration of nC bunches to a beam energy of 2.5 MeV.