Author: Fisher, A.S.
Paper Title Page
MOCLA03
 Fully Intensity and Timing Jitter Compensated Ultra-Fast Experiments at Accelerator-Driven Photonsources at High Repetition Rates  
 
  • S. Kovalev, M. Gensch, B.W. Green
    HZDR, Dresden, Germany
  • A.S. Fisher
    SLAC, Menlo Park, California, USA
  • T. Golz, N. Stojanovic
    DESY, Hamburg, Germany
  • T. Kampfrath
    FHI, Berlin, Germany
  
  Funding: European Union through project EUCALL
Timing jitter and power instabilities are crucial parameters which greatly reduce the applicability of accelerator driven light sources for time-resolved experiments. In this contribution we present a technique that allows achieving few 10 fs time-resolution in experiments operating at cw repetition rates of up to 100 kHz by employing high repetition rate data acquisition. The method employs a fs-level arrival time monitor based on electro-optic sampling* ** of residual pulses from a coherent diffraction radiator and a fast THz detector allowing for pulse to pulse detection of arrival time and pump intensity. The monitor can operate at high repetition rates cw (presently up to a few 100 kHz) and low electron bunch charges (sub pC). The prototype device has been tested at the quasi CW SRF accelerator (ELBE) by performing an ultra-fast THz driven magnetization dynamics experiment***. Our method has high potential to provide few fs level timing on next generation large scale X-ray photon sources based on high repetition rate electron accelerators such as LCLSII. A demonstrator aiming at operation up to 4.7 MHz is under development for the European X-FEL.
* Z. Jiang, X. C. Zhang, IEEE Journal of Quantum Electronics, 36, 1214, 2000
** I. Wilke et al., Phys. Rev. Lett., 88, 124801, 2002.
*** S. Kovalev et. al., under review (2015). 		 
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THBLA01 Summary of the 2014 Beam-Halo Monitoring Workshop 630
 
  • A.S. Fisher
    SLAC, Menlo Park, California, USA
  
  Understanding and controlling beam halo is important for high-intensity hadron accelerators, for high-brightness electron linacs, and for low-emittance light sources. This can only be achieved by developing suitable diagnostics. The main challenge faced by such instrumentation is the high dynamic range needed to observe the halo in the presence of an intense core. In addition, measurements must often be made non-invasively. This talk summarizes the one-day workshop on Beam Halo Monitoring that was held at SLAC on September 19 last year, immediately following IBIC 2014 in Monterey. Workshop presentations described invasive techniques using wires, screens, or crystal collimators, and non-invasive measurements with gas or scattered electrons. Talks on optical methods showed the close links between observing halo and astronomical problems like observing the solar corona or directly observing a planet orbiting another star.  
slides icon Slides THBLA01 [195.465 MB]  
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