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Byrd, J. M.

   
Paper Title Page
PLT35 Summary of WG5 – Novel Diagnostics and Stability Issues  
 
  • J. M. Byrd
    LBNL, Berkeley, California
  • D. Noelle
    DESY, Hamburg
 
  Summary of the Novel Diagnostics and Stability Issues working group.  
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WG113 Seeding of the microbunching instability in a storage ring  
 
  • J. M. Byrd, Z. Hao, M. C. Martin, D. Robin, F. Sannibale, R. W. Schoenlein, A. Zholents, M. S. Zolotorev
    LBNL, Berkeley, California
 
  Funding: This work was supported by the Director, Office of Science, Office of High Energy Physics and Basic Energy Sciences, of the U. S. Department of Energy under Contract No. DE-AC02-05CH11231.

We report observations of laser seeding of the storage ring microbunching instability (MBI). Above a threshold bunch current, the interaction of the beam and its radiation results in a coherent instability, observed as a series of stochastic bursts of coherent synchrotron radiation (CSR) at THz frequencies initiated by fluctuations in the beam density. We have observed that this effect can be seeded by imprinting an initial density modulation on the beam by means of laser ‘slicing'. In such a situation, random bursts of Terahertz CSR become synchronous with the pulses of the modulating laser and their average intensity scales exponentially with the current per bunch. We present detailed experimental observations of the seeding effect and a model of the phenomenon. Control of this instability also creates potential applications as a high power source of CSR at Terahertz frequencies.

 
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WG505 Progess at Berkeley in Femtosecond Timing Systems for Ultrafast Light Sources  
 
  • J. M. Byrd, L. R. Doolittle, J. W. Staples, R. B. Wilcox
    LBNL, Berkeley, California
 
  Funding: This work was supported by the Director, Office of Science, of the U. S. Department of Energy under Contract No. DE-AC02-05CH11231.

We present progress on developments of a timing system with femtosecond sensitivity. Our approach consists of an interferometrically stabilized link that is used to transmit timing information between a master clock and a remote device, typically either an RF system or a laser. Our results show that the optical link can be stabilized to less than 1 fs/h drift and subfemtosecond fast jitter. Transmission of RF signnals can be achieved as an amplitude modulation of the optical carrier. Early results show sub 50 fs jitter introduced on the RF signal, presently limited by measurement accuracy.

 
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