Bungau, A. B. and Bailey, I. R. and Baynham, E. and Bradshaw, T. W. and Brummitt, A. and Carr, F. S. and Clarke, J. A. and Collomb, N. A. and Dainton, J. and Hartin, A. F. and Hesselbach, S. and Hock, K. M. and Jenner, L. J. and Lintern, A. and Malyshev, O. B. and Malysheva, L. I. and Moortgat-Pick, G. A. and Rochford, J. and Ryder, N. C. and Scott, D. J. and Zang, L. (2008) Design of the Photon Collimators for the ILC Positron Helical Undulator. Working Paper. UNSPECIFIED.
Full text not available from this repository.Abstract
A number of photon collimators are placed inside the helical undulator to protect the cold surfaces of the vacuum vessel from being hit by the photons and thus achieving the baseline pressure requirement. Computer simulations were run in order to determine the energy deposition and instantaneous temperature rise in these collimators and various material candidates were studied. This paper presents the status of the simulation.