Bulletin
Board updated
May 8, 2007 ©D.
Carrigan carrigan@fnal.gov (subject line must be sensible)
In
September, 2006 a CERN, INFN (Legnaro, Ferrara, Perugia), Petersburg,
IHEP, Dubna Crystal
Collimation Group led by Walter Scandale produced spectacular
demonstrations of volume
reflection, volume capture, quasimosaic bending, and double crystal
channeling in an experiment at CERN. These results represent extremely
important information bearing on the possibility of channeling
collimation first proposed for the ill-fated SSC by Nikolai
Mokhov and his colleagues. In particular this demonstration of
volume reflection coupled with the observation of effects related to
accelerator collimation at Brookhaven's RHIC
and at Fermilab by Still
and his colleagues give strong indications that channeling collimation
may be a significant candidate for second generation LHC collimation.
The CERN team used a beautiful apparatus with sophisticated
crystals and a high resolution silicon strip spectrometer. The very
complicated system was designed, assembled, and installed in the CERN
SPS 400 GeV H8 beam in the space of less than six months.
Scandale's preliminary
Power Point presentation contains early information on some results
from the experiment.
Information on this experiment has now been published as
"High-Efficiency Volume Relection of an Ultrarelativistic Proton Beam
with a Bent Silicon Crystal",
W. Scandale, et al., Phys. Rev. Lett. 98, 154801 (2007)