Conveners
Session 5 - Other Issues affecting Beam Commissioning II
- Oliver (Chairman) Bruning (AB-ABP)
- Verena (Scientific Secretary) Kain (AB-CO)
Mr
Stephan MAURY
(CERN)
19/01/2005, 09:00
Other Issues affecting Beam Commissioning II
oral
The LHC physics programme with heavy ions (lead-lead) collisions at
a luminosity of 1027 cm-2s-1 can be achieved by upgrading the ion
injector chain: Linac3-LEIR-PS-SPS. The conversion of the Low Energy
Antiproton Ring (LEAR) to a Low Energy Ion Ring (LEIR) has already
started. The conversion includes new magnets and power converters, a
high-current electron cooling system,...
Dr
Jan Uythoven
(CERN)
19/01/2005, 09:20
Other Issues affecting Beam Commissioning II
oral
The LHC transfer line TI 8 was commissioned with beam in the autumn
of 2004. This talk outlines the tests performed and their
conclusions regarding measured beamparameters, optics, beam
instrumentation, control system and machine protection system. In
the same period the LSS4 extraction c hannel and TT40 line were
commissioned with high intensity beams. The important lessons on...
Dr
Helmut Burkhardt
(CERN)
19/01/2005, 09:45
Other Issues affecting Beam Commissioning II
The SPS and LHC optics have already changed during the design phase
and can be expected to further change
during operation.
The combined system of SPS, TI 2, TI 8 and the LHC should be well
matched to allow for clean injection and
minimum emittance blow-up. This implies that the transfer lines have
to provide some flexibility. In addition
to the requirement to match to the SPS and...
Thys RISSELADA
(CERN)
19/01/2005, 10:10
Other Issues affecting Beam Commissioning II
The matching sections at the SPS and LHC ends of TI8 were
designed several years ago. The magnet positions and powering
were optimised to match the constraints existing at that time.
For various reasons the boundary conditions at both the start
and the end of the line have changed. Unfortunately, changes in
dispersion cannot easily be absorbed, as the number of
individually powered...
Verena Kain
(CERN)
19/01/2005, 10:45
Other Issues affecting Beam Commissioning II
The LHC injection process comprises extraction from the SPS, transfer through the
transfer lines TI2 and TI8 and finally injection into the LHC in IR2 and IR8. The
nominal intensities foreseen for injection are well over an order of magnitude above
the damage limit. Equipment failures resulting in beam loss will therefore cause
severe damage to the SPS, the transfer lines or the LHC....
Dr
Daniela Macina
(CERN)
19/01/2005, 11:10
Other Issues affecting Beam Commissioning II
oral
All four experimental insertion regions will be equipped with movable
devices which,
in some cases, have to be located very close to the beam. In addition
both ALICE and
LHCb use spectrometer magnets which distort the beam trajectories.
Their
effect therefore, has to be compensated locally with dedicated
compensation magnets.
The location of this experimental equipment and the...
Dr
Emmanuel Tsesmelis
(CERN)
19/01/2005, 11:35
Other Issues affecting Beam Commissioning II
This report provides an overview of issues arising at the interface between the LHC
machine and the experiments. These issues will be required to guide the interaction
between the collider and the experiments when operation of the LHC commences. In
particular, the analysis of signals and parameters to be exchanged between the
experiments and the accelerator will be presented. Emphasis...
