Title :
RF characterization of a tunable, high-gradient, X-band photoinjector
Author :
Hartemann, F.V. ; Landahl, Eric C. ; Gibson, David J. ; Troha, Anthony L. ; Van Meter, James R. ; Heritage, Jonathan P. ; Baldis, Hector A. ; Luhmann, N.C., Jr. ; Ho, C.H. ; Yang, T.T. ; Horny, M.J. ; Hwang, J.Y. ; Lau, W.K. ; Yeh, M.S.
Author_Institution :
Inst. for Laser Sci. & Applications, Lawrence Livermore Nat. Lab., CA, USA
fDate :
6/1/2000 12:00:00 AM
Abstract :
Highly accurate measurements of an X-band (8.548 GHz) radio frequency (RF) gun, designed to produce short (<1 ps), relativistic (5 MeV), low-emittance (<1 π-mm/mrad, at 0.1 nC) electron bunches, have been performed at medium-power levels (1 kW, 6 μs, 30 Hz). Balanced (within 3%), high-Q (4274), π-mode excitation at critical coupling (S11 < -80 dB) has been demonstrated by performing in situ phase measurements. A new tuning method to accurately adjust the coupling has been successfully implemented, which complements the independent tuning of the half and full cells, and the precise (-136 kHz/°C) temperature tuning of the gun. Finally, preliminary photoelectron results are also outlined.
Keywords :
electron guns; free electron lasers; particle beam bunching; relativistic electron beam tubes; tuning; 1 kW; 1 ps; 30 Hz; 5 MeV; 6 mus; 8.548 GHz; RF characterization; X-band radio frequency gun; critical coupling; full cell; half cell; high-Q π-mode excitation; independent tuning; medium-power levels; photoelectrons; short relativistic low-emittance electron bunches; temperature tuning; tunable high-gradient X-band photoinjector; tuning method; Drugs; Electron accelerators; Electron beams; Free electron lasers; Laboratories; Laser tuning; Performance evaluation; Radio frequency; Tunable circuits and devices; X-rays;
Journal_Title :
Plasma Science, IEEE Transactions on
