Yuri Nosochkov: 20mrad Extraction Line
with L*=8m and L*=15m Options
- Yuri Nosochkov presented design of extraction line for 20-mrad x-ing for
two versions of L*, 8m and 15m. In both cases, there are no losses of the
tracked disrupted beam. The second version may be easier in terms of
interference with the incoming beamline quads. Further studies would need to
include non-ideal colliding beams.
Mauro Pivi: ATF2 Optics - Kuroda & Okugi Design
- Mauro Pivi and Okugi-san are making progress with SAD tracking of
the extraction + final focus versions and Mauro presented the
Tom Markiewicz: Summary of Brett
Parker's New SC QD0 Designs
- Tom Markiewicz presented a summary of SC quads developments by Brett
Parker. One of the recent news from BNL colleagues is that winding with
small turn radius is possible not only with single wire, but also with
the 7-wires cable. This makes the packaging to be more effective and
gives same field with smaller coil size. This winding has been tested.
Among the latest thought on SC quad design is the possibility to combine
QD0 with external dipole corrector, to zero the field at the extraction
beam location, where, in addition, small gradient field would be
provided, which could help to focus the extracted beam. The
sextupole-like and octupole-like magnets with double quadrupole center
is another tool which could be used to build the IR.
Andrei Seryi: IR Layout Issues
- Andrei Seryi have shown results of a simple test, which tells that
it seems feasible to place the crab cavity in FF area (e.g. near QF5),
and not in FD, where there would not be enough transverse space for that
cavity in 2mrad x-ing case.
- We also discussed a possible layout of the IR region, which would
provide sufficient separation between IRs and between beam-dumps and
extraction lines. The need for sharp bend in the 2-mrad extraction line,
to provide separation for the beam dump, and placement of the photon
dump near the beamline, are important design criteria.