Agenda

1) Synchrotron Radiation from 2mrad FD and backscattering from extraction line elements - Takashi Maruyama

Summary

Takashi presented results on synchrotron radiation from 2mrad FD and backscattering from extraction line elements, in particular from the surface of BYCHICMB magnet, located 88m from IP.
Conclusions are the following:
    SR power at the magnet surface is 2.5 kW @ 250 GeV and 40.6 kW @ 500 GeV.
    Backscattered photon flux at IP is 2200/BX @ 250 GeV and 11700/BX @500 GeV.
    The IP photon flux is x3 (250 GeV) and x6 (500 GeV) of the secondary photons from pairs
Most of this photons would hit beam pipe near IP. Reduction of backscattering, using layered materials, need to be evaluated.

Andrei Seryi, 07/14/06