We are here in the SPS the super proton
synchrotron it's the main injector to
the LHC we are approximately 40 meters
underground in that direction
you have Meyrin and in this other one, Prevessin
where the extraction of the LHC occurs
occurs what you see behind me is the
installation of the transfer table for
the crab cavity test stand for HiLumi
HiLumi is the main project for the
coming years
It's a project to increase the
luminosity which means the number of
collisions of the LHC. The crab cavities
are an essential for HiLumi.
They have to decrease the crushing angle of
the bunches in order to increase the number of collisions
The installation started two years ago
installed most of the infrastructure
means cables and the cryogenic line
which you see there and this year we
have the main installation of the test stand
-including all elements- The reason why
we test the crab cavities in the SPS is
that they were never tested in proton
beam before but the SPS is a working machine
We cannot use it for testing
unless we guarantee that it can remain
working for the LHC. We install the
crab cavity cryo module on this object
which you see here in order to transfer
it in beam and out of beam when we want
To do measurements we will have the
for extended machine development periods
during the whole year 2018 and this will
validate the crab cavities for HiLumi
in proton winging beyond the crop
cavities this is a long-term investment
because we can install here other
superconducting RF structures in
development to test them in beam
It will be a unique facility in the world
