• Y. Sun, A.L. Eide, F. Zimmermann
  CERN, Geneva
• C. Adolphsen
  SLAC, Menlo Park, California

In this paper, we present a lattice design for the Large Hadron Electron Collider (LHeC) recirculating Linac. The recirculating Linac consists of one roughly 3km long linac hosting superconducting RF (SRF) accelerating cavities, two arcs and one transfer line for the recirculation. Electron beam will have two passes in the SRF linac to get a maximum energy of 140 GeV, or have four passes with a maximum energy of 60 GeV (two for acceleration and two for deceleration) in the Energy Recovery Linac (ERL) option.

• F. Zimmermann, O.S. Brüning, E. Ciapala, F. Haug, J.A. Osborne, D. Schulte, Y. Sun, R. Tomás
  CERN, Geneva
• C. Adolphsen
  SLAC, Menlo Park, California
• R. Calaga, V. Litvinenko
  BNL, Upton, Long Island, New York
• S. Chattopadhyay
  Cockcroft Institute, Warrington, Cheshire
• J.B. Dainton, M. Klein
  The University of Liverpool, Liverpool
• A.L. Eide
  LPNHE, Paris

We consider three different scenarios for the recirculating electron linear accelerator (RLA) of a linac-ring type electron-proton collider based on the LHC (LHeC): i) a basic version consisting of a 60 GeV pulsed, 1.5 km long linac, ii) a higher luminosity configuration with a 60 GeV 4 km long cw energy-recovery linac (ERL), and iii) a high energy option using a 140 GeV pulsed linac of 4 km active length. This paper describes the footprint, optics of linac and return arcs, emittance growth from chromaticity and synchrotron radiation, a set of parameters, and the performance reach for the three scenarios.