Mark Woodley: Optics Required for Straw Man Layout w/ 20 and
2 mrad IPs
- Mark Woodley presented almost complete zeroth order optics for two
interaction regions, with 20mrad and 2mrad crossing angles. This optics use
the same BDS optics for both Irs (with passive survivable collimators),
latest Yuri's extraction line for 20mrad IR, NLC style BSY with Yuri's
combined function dipoles (which give shorter system than double bend
- There is a number of modifications that are needed to be done with this
optics, in particular: introduce longitudinal separation of Irs to provide
detector separation, incorporate Brett Parker's style fast tune-up
extraction line, include polarimeter (~50m length) upstream of energy
collimator, include energy spectrometer (~50m) downstream of the energy
collimator, etc., and finally combine with the 2mrad extraction line which
is still being designed.
Andrei Seryi: Conventional Facilities Constraints on
- Andrei Seryi presented couple of versions of 20mrad/2mrad
configuration, where the IP separation is achieved either by
longitudinal separation, lengthening the BDS site, or by second big bend
located between the collimation and final focus. Symmetrical (zero dz)
and asymmetrical (longitudinal offset of IPs) detector configuration
were considered. For the symmetrical case the site length is increased
significantly, unless the second big bend in between of the BDS is used.
In the latter case the optics implications are not yet clear.
- It was concluded, that optics decks for strawman configuration would
be based on what Mark presented, with additional ~150m longitudinal
separation of the Ips.