474
F. Bordry et al.
Fig. 8.81 Schematic of a Lambertson septum (left); a Lambertson septum used in the LHC
injection (bottom row)
using a superconducting septum, care must be taken to protect the superconductors
from beam impact, hence heat load, to avoid quenching the septum. Also because
of the superconductors, the use of superconducting septa is more suitable for
slowly varying fields (extraction towards dump lines of high-energy accelerators for
example) of constant energy application (such as injection into colliders or storage
rings).
To reduce activation of magnetic septa, caused by beam hitting the septum
blade, dummy septa can be installed upstream of the septum, see Fig. 8.81 (left).
A dummy septum is a passive element that is to intercept the particles that
otherwise would hit the septum blade [209]. This is relevant for unbunched beam
transfer. To be effective, the dummy septum needs to be perfectly aligned with
the downstream septum, and therefore can be equipped with its own displacement
system. The dummy septum being a more robust device than the septum magnet,
F. Bordry et al.
Fig. 8.81 Schematic of a Lambertson septum (left); a Lambertson septum used in the LHC
injection (bottom row)
using a superconducting septum, care must be taken to protect the superconductors
from beam impact, hence heat load, to avoid quenching the septum. Also because
of the superconductors, the use of superconducting septa is more suitable for
slowly varying fields (extraction towards dump lines of high-energy accelerators for
example) of constant energy application (such as injection into colliders or storage
rings).
To reduce activation of magnetic septa, caused by beam hitting the septum
blade, dummy septa can be installed upstream of the septum, see Fig. 8.81 (left).
A dummy septum is a passive element that is to intercept the particles that
otherwise would hit the septum blade [209]. This is relevant for unbunched beam
transfer. To be effective, the dummy septum needs to be perfectly aligned with
the downstream septum, and therefore can be equipped with its own displacement
system. The dummy septum being a more robust device than the septum magnet,