Author: Kayran, D.
Paper Title Page
WG2005
 Lattice Designs for the Future ERL-based Electron Hadron Colliders eRHIC and LHeC  
 
  • V. Ptitsyn, Y. Hao, D. Kayran, V. Litvinenko, D. Trbojevic, N. Tsoupas
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
We present a lattice design of future ERL-based electron-hadron collider eRHIC and BNL version of the lattice design LHeC . In eRHIC, an six-pass ERL installed in the existing Relativistic Heavy Ion Collider (RHIC) tunnel will collide 5-30 GeV polarized electrons with RHIC's 50-250 (325) GeV polarized protons or 20-100 (130) GeV/u heavy ions. In BNL's version for LHeC, a stand-along 3-pass 60 GeV CW ERL will collide polarized electrons with 7 TeV protons. The multiple arcs are made of Flexible Momentum Compaction lattice (FMC) allowing adjustable R56 parameter. The multiple arcs, placed above each other, are matched to the linacs straight sections with splitters and combiners. Other important eRHIC lattice components have been developed: quadrupole-less linac optics; by-pass lines around the detectors and the pass lengthening insertion (needed to match the bunch frequencies of the electrons and hadrons in wide hadron energy range). 		 
slides icon Slides WG2005 [4.620 MB]  
 
WG2014 Wake Fields and Energy Spread for the eRHIC ERL 64
 
  • A.V. Fedotov, D. Kayran
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work supported by the U.S. Department of Energy under contract No. DE-AC02-98CH10886
Wakefields in high-current ERLs can cause significant beam quality degradations. Here we summarize effects of Coherent Synchrotron Radiation (CSR), resistive wall, accelerator cavities and wall roughness for ERL parameters of the eRHIC project. A possibility of compensation of such correlated energy spread is presented. An emphasis in the discussion is made on CSR suppression due to shielding and on the suppression of wall roughness effects for realistic surfaces. 		 
slides icon Slides WG2014 [0.953 MB]  
 
WG2015
 Transverse BBU Studies for eRHIC at Different Top Energy Settings  
 
  • D. Kayran, Y. Hao, V. Litvinenko, V. Ptitsyn, D. Trbojevic, W. Xu
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Transverse beam break up instability is one of the main limited factor to achieve high average current operation in Energy Recovery Linacs. 30 GeV ERL is considered as an electron source for electron ion collider (eRHIC) at BNL. The full scale ERL consist of 6 passes up and 6 passes dawn through 2 SRF linacs with ~2.5 GeV gain energy each. The average current required for eRHIC is 50 mA from injector. The full scale machine has to be capable to operate at various top energies (from 5 to 30 GeV). We will present results of BBU threshold calculation based on new design BNL3 SRF cavity with HOMs dumping for different top energy settings and discuss possible scenarios to satisfy the requirements. 		 
slides icon Slides WG2015 [0.653 MB]  
 
WG4003
 BNL Energy Recovery Linac Instrumentation  
 
  • D.M. Gassner, L. DeSanto, D. Kayran, G.J. Mahler, R.J. Michnoff, T.A. Miller, M. Wilinski
    BNL, Upton, Long Island, New York, USA
  
  The Energy recovery Linac project is currently under development at the Brookhaven National Laboratory. The ERL is expected to demonstrate energy recovery of high intensity beams with a current of up to a few hundred milliamps, while preserving the emittance of bunches with a charge of a few nanocoulombs produced by a high current SRF gun. To successfully accomplish this task the machine will include beam diagnostics that will be used for accurate characterization of the three dimensional beam phase space at the injection and recirculation energies, transverse and longitudinal beam matching, orbit alignment, beam current measurement, and machine protection. This paper describes the present status of the systems that will be used to meet these goals.  
slides icon Slides WG4003 [2.253 MB]