High-power RF pulse compression with SLED-II at SLAC

Authors:
  • CHC. Hantista
    C. Hantista
  • ZFZ.D. Farkas
    Z.D. Farkas
  • NKN.M. Kroll
    N.M. Kroll
  • TLT.L. Lavine
    T.L. Lavine
  • AMA. Menegat
    A. Menegat
  • RRR.D. Ruth
    R.D. Ruth
  • STS.G. Tantawi
    S.G. Tantawi
  • AVA.E. Vlieks
    A.E. Vlieks
  • PWP.B. Wilson
    P.B. Wilson
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Abstract
Increasing the peak rf power available from X-band microwave tubes by means of rf pulse compression is en- visioned as a way of achieving the few-hundred-megawatt power levels needed to drive a next-generation linear col- lider with 50-100 MW klystrons. SLED-II is a method of pulse compression similar in principal to the SLED method currently in use on the SLC and the LEP injec- tor linac. It utilizes low-loss resonant delay lines in place of the storage cavities of the latter. This produces the added benefit of a flat-topped output pulse. At SLAC, we have designed and constructed a prototype SLED-II pulse-compression system which operates in the circu- lar TEol mode. It includes a circular-guide 3-dB cou- pler and other novel components. Low-power and initial high-power tests have been made, yielding a peak power multiplication of 4.8 at an efficiency of 40%. The system will be used in providing power for structure tests in the -ASTA-(Accelerator Structures Test Area) bunker (l). An upgraded second prototype will have improved efficiency and will serve as a model for the pulse compression system of the NLCTA (Next Linear Collider Test Accelerator).