Two-dimensional Effects on the Behavior of the CSR Force In a Bunch Compression Chicane

Conference · Mon Aug 01 04:00:00 EDT 2011

OSTI ID:1969042

Li, R. ^[1]; Legg, R. ^[1]; Terzic, B. ^[1]; Bisognano, J. J. ^[2]; Bosch, R. A. ^[2]

---

1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
2. UW-Madison/SRC, Stoughton, WI

The endeavour to reach higher brightness of electron beams in designs of future FEL is often challenged by the coherent synchrotron radiation (CSR) effect in bunch compression chicanes. Extensive studies on the CSR effects have shown that the 1D approximation of the CSR force is valid for a wide parameter regime. However, as the bunch gets increasingly compressed in the chicane, the behaviour of the CSR interaction force will be influenced by the evolution of the 2D bunch charge-density distribution in the bending plane. Here we explore this 2D effect for over-compression cases using the previously developed semi-analytical study of the effective longitudinal CSR force for a bunch with evolving 4D Gaussian phase space distribution and an initial linear energy chirp. We will display the dependence of the 2D CSR force on the initial horizontal emittance and uncorrelated energy spread for path lengths around that of the minimum bunch length. We will also present and discuss the comparison of these results with their counterparts in the 1D rigid-line bunch model.

• 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: 1969042
• Report Number(s): JLAB-ACP-11-1468; DOE/OR/23177-1942
• Country of Publication: United States
• Language: English