• Y. Zhang, S.A. Bogacz, A. Bruell, P. Chevtsov, Y.S. Derbenev, R. Ent, G.A. Krafft, R. Li, L. Merminga, B.C. Yunn
  JLAB, Newport News, Virginia

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.

The conceptual design of a ring-ring electron-ion collider based on CEBAF has been continuously optimized to cover a wide center-of-mass energy region and to achieve high luminosity and polarization to support next generation nuclear science programs. Here, we summarize the recent design improvements and R&D progress on interaction region optics with chromatic aberration compensation, matching and tracking of electron polarization in the Figure-8 ring, beam-beam simulations and ion beam cooling studies.

• R. Li
  JLAB, Newport News, Virginia

Funding: This work is supported under U.S. DOE Contract No. DE-AC05-06OR23177.

When an electron bunch with initial linear energy chirp traversing a bunch compression chicane, the bunch interacts with itself via coherent synchrotron radiation (CSR) and space charge force. The effective longitudinal CSR force for a 2D energy-chirped gaussian bunch on a circular orbit has been analyzed earlier*. In this paper, we present our analytical results of the effective longitudinal CSR force for such a bunch going through a general orbit, which includes the entrance and exit of a circular orbit.

*R. Li, Phys. Rev. ST Accel. Beams 11, 024401 (2008).