01 Circular Colliders

A16 Energy Recovery Linacs

Paper Title Page
TUPEB039 Designs for a Linac-Ring LHeC 1611
 
  • 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.

 
TUPEB040 Small Gap Magnet Prototype Measurements for eRHIC 1614
 
  • Y. Hao, P. He, A.K. Jain, V. Litvinenko, G.J. Mahler, W. Meng, J.E. Tuozzolo
    BNL, Upton, Long Island, New York
 
 

In this paper we present the design and prototype measurement of small gap (5mm to 10 mm aperture) dipole and quadrupole for the future high energy ERL (Energy Recovery Linac). The small gap magnets have the potential of largely reducing the cost of the future electron-ion collider project, eRHIC, which requires a 10GeV to 30 GeV ERL with up to 6 energy recovery passes (3.8 km each pass). We also studied the sensitivity of the energy recovery pass and the alignment error in this small magnets structure and countermeasure methods.

 
TUPEB042 The Transverse Linac Optics Design in Multi-pass ERL 1620
 
  • Y. Hao, J. Kewisch, V. Litvinenko, E. Pozdeyev, V. Ptitsyn, D. Trbojevic, N. Tsoupas
    BNL, Upton, Long Island, New York
 
 

In this paper, we analyzed the linac optics design requirement for a multi-pass energy recovery linac (ERL) with one or more linacs. A set of general formula of constrains for the 2-D transverse matrix is derived to ensure design optics acceptance matching throughout the entire accelerating and decelerating process. Meanwhile, the rest free parameters can be adjusted for fulfilling other requirements or optimization purpose. As an example, we design the linac optics for the future MeRHIC (Medium Energy eRHIC) project and the optimization for enlarging the BBU threshold.