Agenda:
1) Power Load from Radiative Bhabhas in the 2 mrad Extraction Line -- T.
Maruyama
2) Summary of 22 April 2005 2 mrad IR Phone Meeting w/European colleagues -- M.
Woodley
3) Summary of 21 April 2005 Beam Dump Meeting (w/ D. Walz) -- Lew Keller
Summary:
Takashi showed that while power load is < 1W/10cm even for the 1 TeV hi-lum
parameter set, the electrons strike the magnet in a narrow band around the
horizontal midplane. The density may be high and the possibility of
quenching an SC magnet may still be a possibility.
Mark reviewed the 2 mrad discussion. Points of note:
- long, weak FD used in SLAC design needs to be quantitatively compared
against short, strong FD used by European colleagues
- There seem to be issues regarding collimation, masking & VXD minimum
radius which need more study
- Agreement to exchange detailed optics decks
- US to check short FD in context of complete extraction line
- Euro-colleagues to add extraction line to their decks & to look at
US long FD solution
Lew reviewed the dump meeting. Points:
- Dump window is still main issues & is maximally stressed at the high
beam current of the 500 GeV design
- Undisrupted beam needs to be blown up while still keeping disrupted
beam under control
- Rastering seems best choice at this time
- Donut collimators for photon and charged particle tails likely
to be needed
- There should be NO PROBLEM putting in a beam pipe for the incident beam
in the beamstrahlung beam dump for the 2 mrad design. Just need to clear the
window area.
Tom Markiewicz,
04/29/05