Speaker
Description
The main SPS users are the experiments installed in North
experimental Area (NA) which are served with a continuous 4.8 s long
spill of protons and heavy ions. A third-integer resonant slow extraction is used to provide a uniform, long spill. Such a technique
comes at the cost of particles directly hitting the electrostatic septum
wires and activating the surrounding of the extraction
channel. In recent years, silicon bent crystals have been exploited to shadow
the wires of the septum blade and reduce the beam induced activation.
It was then demonstrated the experimental success of local shadowing in
the SPS and a way to further reduce losses with a non-local
installation of the crystal. After the last yearly stop, a new Si bent
crystal was installed in LSS4 of the SPS. In this paper, the first
results from measurements with beam are reported together with
limitations and possible upgrades of the present installation.
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