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Martin, M. C.

 
Paper Title Page
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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