Keyword: klystron
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WEPG16 The SLAC LINAC LLRF Controls Upgrade linac, timing, LLRF, controls 654
  • D. Van Winkle, J.M. D'Ewart, J.C. Frisch, B. Hong, U. Legat, J.J. Olsen, P. Seward, J.A. Vásquez
    SLAC, Menlo Park, California, USA
  Funding: Work supported by Department of Energy contract DE-AC02-76SF00515
The low level RF control for the SLAC LINAC is being upgraded to provide improved performance and maintainability. RF control is through a high performance FPGA based DDS/DDC system built on the SLAC ATCA common platform. The klystron and modulator interlocks are being upgraded, and the interlocks are being moved into a combination of PLC logic and a fast trip system. A new solid state sub-booster amplifier will eliminate the need for the 1960s vintage high RF phase shifters and attenuators.
poster icon Poster WEPG16 [12.133 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG16  
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WEPG77 Sub-fs Resolution with the Enhanced Operation of the X-band Transverse Deflecting Cavity using an RF pulse Compression SLED Cavity cavity, electron, operation, photon 833
  • P. Krejcik, G.B. Bowden, S. Condamoor, Y. Ding, V.A. Dolgashev, J.P. Eichner, M.A. Franzi, A.A. Haase, J.R. Lewandowski, T.J. Maxwell, S.G. Tantawi, J.W. Wang, L. Xiao, C. Xu
    SLAC, Menlo Park, California, USA
  Funding: Work supported by DOE contract DE-AC03-76SF00515.
The successful operation of the x-band transverse deflecting cavity (XTCAV) installed downstream of the LCLS undulator has been further enhanced by the recent addition of an RF pulse compression "SLED" cavity that doubles the temporal resolving power of this powerful diagnostic system for measurement of the longitudinal profile of both the electron bunch and the x-ray FEL pulse. RF pulse compression has allowed us to use the existing SLAC X-band klystron with nominal output power of 50 MW and extend the RF pulse length by a factor 4 to give us 4 times the peak power after compression. A new, innovative SLED cavity was designed and built at SLAC to operate efficiently at X-band*. The elegant design uses a small spherical cavity combined with a polarizing mode coupler hybrid. We will report on the installation, commissioning and beam measurements demonstrating the sub-femtosecond resolution of the XTCAV system.
*J.W. Wang et al., "R&D of a Super-compact SLED System at SLAC", in Proc. 7th International Particle Accelerator Conference (IPAC'16), Busan, Korea, May 2016, paper MOOCA01, pp. 39-41.
poster icon Poster WEPG77 [20.909 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG77  
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