Multistage CSR Microbunching Gain Development in Transport or Recirculation Arcs

Conference · Tue Dec 01 04:00:00 EST 2015

OSTI ID:1969044

Tsai, C. -Y. ^[1]; Douglas, D. ^[2]; Li, R. ^[2]; Tennant, C. ^[2]

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1. Virginia Tech, Blacksburg, VA
2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Coherent synchrotron radiation (CSR) induced microbunching instability has been one of the most challenging issues in the design of modern accelerators. A linear Vlasov solver has been developed [1] and applied to investigate the physical processes of microbunching gain amplification for several example lattices [2]. In this paper, by further extending the concept of stage gain as proposed by Huang and Kim [3], we develop a method to characterize the microbunching development in terms of stage orders that allow the quantitative comparison of optics impacts on microbunching gain for different lattices. We find that the microbunching instability in our demonstrated arcs has a distinguishing feature of multistage amplification (e.g, up to 6th stage amplification for our example transport arcs, in contrast to two-stage amplification for a typical 4-dipole bunch compressor chicane). We also try to connect lattice optics pattern with the obtained stage gain functions by a physical interpretation. This Vlasov analysis is validated by ELEGANT [4] tracking results with excellent agreement.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1969044
• Report Number(s): JLAB-ACP-15-2178; DOE/OR/23177-3608
• Country of Publication: United States
• Language: English