• J.A. Crittenden, I.V. Bazarov, S.A. Belomestnykh, D.H. Bilderback, M.G. Billing, J.D. Brock, E.P. Chojnacki, B.M. Dunham, M. P. Ehrlichman, M.J. Forster, S.M. Gruner, G.H. Hoffstaetter, Y. Li, M. Liepe, C.E. Mayes, A.A. Mikhailichenko, H. Padamsee, S.B. Peck, D. Sagan, V.D. Shemelin, A.B. Temnykh, M. Tigner, V. Veshcherevich
  CLASSE, Ithaca, New York
• C. Johnstone
  Fermilab, Batavia

Cornell University is planning to build an Energy-Recovery Linac (ERL) X-ray facility. In this ERL design, a 5 GeV superconducting linear accelerator extends the CESR ring which is currently used for the Cornell High Energy Synchrotron Source (CHESS). Here we describe some of the recent developments for this ERL, including linear and nonlinear optics, tracking studies, vacuum system design, gas and intra beam scattering computations, and collimator and radiation shielding calculations based on this optics, undulator developments, optimization of X-ray beams by electron beam manipulation, technical design of ERL cavities and cryomodules, and preparation of the accelerator site.

Slides

• A.A. Mikhailichenko
  CLASSE, Ithaca, New York

We are analyzing ILC positron source for best polarization and efficiency. 70% polarization looks feasible for 170 m undulator at 150 GeV. Conversion efficiency and polarization at 500 GeV considered also. We are making suggestions for reaching 80% positron polarization AT ILC as well.

• A.A. Mikhailichenko
  CLASSE, Ithaca, New York
• H. Aksakal
  N.U, Nigde

We consider a scheme for gamma-gamma collisions at ILC. In our scheme the electron beam from 5 GeV injector-Linacs, present in ILC scheme, used in FEL amplifier. The laser radiation from solid-state laser amplified in this FEL and directed to nearby IP point for further Compton back scattering. Two additional ~50 m helical undulators and master laser system of intermediate power required for this scheme at ILC.

• T.W. Markiewicz, M. Oriunno, A. Seryi
  SLAC, Menlo Park, California
• K. Buesser
  DESY, Hamburg
• P. Burrows
  OXFORDphysics, Oxford, Oxon
• J.M. Hauptman
  ISU, Ames
• A.A. Mikhailichenko
  CLASSE, Ithaca, New York
• B. Parker
  BNL, Upton, Long Island, New York
• T. Tauchi
  KEK, Ibaraki

Funding: Work supported in part by US DOE contract DE-AC02-76-SF00515.

The Interaction Region of the International Linear Collider* is based on two experimental detectors working in a push-pull mode. A time efficient implementation of this model sets specific requirements and challenges for many detector and machine systems, in particular the IR magnets, the cryogenics and the alignment system, the beamline shielding, the detector design and the overall integration. This paper attempts to separate the functional requirements of a push pull interaction region and machine detector interface from the conceptual and technical solutions being proposed by the ILC Beam Delivery Group and the three detector concepts**. As such, we hope that it provides a set of ground rules for interpreting and evaluation the MDI parts of the proposed detector concept’s Letters of Intent, due March 2009. The authors of the present paper are the leaders of the IR Integration Working Group within Global Design Effort Beam Delivery System and the representatives from each detector concept submitting the Letters Of Intent.

*ILC Reference Design Report, ILC-Report-2007-01.
**Materials of IR Engineering Design Workshop, 2007, http://www-conf.slac.stanford.edu/ireng07