CONDITIONS FOR CSR MICROBUNCHING GAIN SUPPRESSION

Conference · Sun May 01 00:00:00 EDT 2016 · Phys. Rev. Accel. Beams

DOI:https://doi.org/10.1103/PhysRevAccelBeams.20.024401· OSTI ID:1331982

Tsai, Cheng Ying ^[1]; Douglas, David R. ^[2]; Li, Rui ^[2]; Tennant, Christopher D. ^[2]; di Mitri, Simone ^[3]

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1. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
3. Elettra–Sincrotrone Trieste, 34149 Basovizza, Trieste, Italy

The coherent synchrotron radiation (CSR) of a high brightness electron beam traversing a series of dipoles, such as transport arcs, may result in phase space degradation. On one hand, the CSR can perturb electron transverse motion in dispersive regions along the beamline, causing emittance growth. On the other hand, the CSR effect on the longitudinal beam dynamics could result in microbunching gain enhancement. For transport arcs, several schemes have been proposed* to suppress the CSR-induced emittance growth. Similarly, several scenarios have been introduced** to suppress CSR-induced microbunching gain, which however mostly aim for linac-based machines. In this paper we try to provide sufficient conditions for suppression of CSR-induced microbunching gain along a transport arc, analogous to*. Several example lattices are presented, with the relevant microbunching analyses carried out by our semi-analytical Vlasov solver***. The simulation results show that lattices satisfying the proposed conditions indeed have microbunching gain suppressed. We expect this analysis can shed light on lattice design approach that could suppress the CSR-induced microbunching gain.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1331982
• Report Number(s): JLAB-ACP-16-2257; DOE/OR/23177-3834
• Journal Information: Phys. Rev. Accel. Beams, Vol. 20, Issue 02; Conference: IPAC'16, 08-13 May 2016. Busan, Korea
• Country of Publication: United States
• Language: English