Abstracts Brochure - CERN

MOPLS011
MOPLS012
MOPLS013
26-Jun-06 16:00 - 18:00 MOPLS — Poster Session
Investigations of the Parameter Space for the LHC Luminosity Upgrade
Increasing the LHC luminosity by a factor of
J.-P. Koutchouk (CERN)
ten is a major challenge, not so much for the
beam optics but certainly for the beam-beam
long-range interactions and even more for the technology and layout: the quadrupole gradient, its physical aperture
and tolerance to the energy deposition shall be significantly increased; its distance to the crossing point shall be
reduced if the particle detectors can allow it. To help identifying consistent solutions in this multi-dimensional
constrained space, a algorithmic model of an LHC insertion was prepared, based on the present LHC layout, i.e.,
"quadrupole first" and small crossing angle. The model deals with the layout, the beam optics, the beam-beam effect,
the superconductor field margins and the peak heat deposition in the coils. The approach is simplified to allow a large
gain in the design/computation time for optimization. First results have shown the need to use the Nb3Sn technology
(or a material of equivalent performance) to reach the performance goal. In this paper, the model is refined to take into
account the quench levels and temperature margins. The optimal insertions within the framework of this approach
are identified.
The LHC Sector Test
M. Lamont, R. Bailey, H. Burkhardt, B. Goddard, L.K. Jensen, O.R.
Jones, V. Kain, A. Koschik, R.I. Saban, J.A. Uythoven, J. Wenninger
(CERN)
110
The proposal to inject beam into a sector of
the partially completed LHC is presented.
The test will provide an important milestone,
force preparation of a number of key systems,
and allow a number of critical measurements
with beam. The motivation for the test is discussed, along with the proposed beam studies, the radiation issues and the
potential impact on ongoing installation. The demands on the various accelerator systems implicated are presented
along with the scheduling of the preparatory steps, the test itself and the recovery phase.
The Roman Pot for LHC
M. Oriunno, M. Deile, K. Eggert, J.-M. Lacroix, S.J. Mathot, E.P.
Noschis, R. Perret, E.R. Radermacher, G. Ruggiero (CERN)
The LHC machine will be equipped with Roman
Pot stations by the TOTEM experiment
to measure the pp total cross section and to
study the elastic scattering and the diffrac-
tion physics processes. TOTEM needs to bring the pots, equipped with cold micro-strip silicon detectors, as a close
as possible to the high intensity beam of LHC. Because of the special optics required by TOTEM, the beam has a
transversal size of only 80 microns at the Roman pot locations. Safety considerations for the machine protection set
the limit to 10 ?, i.e. 800 µm. Such unprecedented parameters, together with the issues of the Ultra High Vacuum
and the RF compatibility, and the harsh radiation environment, have requested a design for the Roman Pot system,
which is compliant with the LHC requirements and operations. To better meet also the challenging requirements of
TOTEM, a technology development of a thin window has been pursued and a flatness of less than 50 µm has been
obtained by brazing foil of 150 µm thicknesses. A prototype of the Roman Pot and of the thin window box have been
manufactured and tested. We describe the main issues of the final design and the results of the preliminary tests.