| Paper |
Title |
Other Keywords |
Page |
| IT05 |
Results with LHC Beam Instrumentation Prototypes
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instrumentation, diagnostics, collider, storage-ring |
21 |
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- C. Fischer
CERN, Geneva, Switzerland
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The beam instrumentation foreseen to provide the
necessary diagnostics in the transfer lines and in the main
rings of the LHC was conceived in the past years. The
requirements expected from the different systems are now
being closely analyzed and specified. In a few cases, tests
of prototypes have already been performed, profiting from
the facilities offered by existing machines.
The beam position measurement system had to be
tackled first, as the pick-ups had to be integrated into the
cryogenic part of the machine. Over the last two years
other topics started to be experimentally investigated in
order to define the best way to meet the requirements for
the LHC era. Amongst these different studies are
luminosity monitoring devices, various instruments for the
measurement of the transverse beam distributions, the use
of head-tail sampling to measure the beam chromaticity
and quadrupole gradient modulation to derive the local
amplitude of the lattice function.
The paper discusses the results of these tests.
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| IT11 |
Possible Spin-Offs from LHC Physics Experiments for Beam Instrumentation
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instrumentation, diagnostics, storage-ring, collider |
51 |
| |
- R. Jones
CERN, Geneva, Switzerland
| |
This paper aims to introduce some of the new
technology and materials used in the construction of the
LHC physics experiments into the domain of the beam
instrumentalist. The development of radiation hard fibre-optic
technology, for example, can equally well be
applied to beam instrumentation systems for the direct
transmission of analogue or digital signals from high to
low radiation environments. Many electronics techniques
such as a system developed for the fast integration of
photomultiplier signals could also prove very useful in
the construction of new beam diagnostic instruments for
bunch-to-bunch measurements. Other topics covered will
include a fast beam synchronous timing system based on
laser technology and a look at pixel detectors as a
possible replacement for CCD cameras in imaging
applications.
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| CT11 |
New Development of a Radiation-Hard Polycrystalline CDTE Detector for LHC Luminosity Monitoring
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instrumentation, diagnostics, collider, storage-ring, luminosity |
94 |
| |
- E. Rossa, H. Schmickler
CERN, Geneva, Switzerland
- A. Brambilla, L. Verger, F. Mongellaz
LETI, Grenoble, France
| |
Detectors presently considered for monitoring and
control of the LHC luminosity will sample the
hadronic/electromagnetic showers produced by neutrons
and photons in copper absorbers designed to protect the
superconducting magnets from quenching. At this
location the detectors will have to withstand extreme
radiation levels and their long term operation will have to
be assured without requiring human intervention. For this
application we have successfully tested thick
poly-crystalline-CdTe detectors. The paper summarizes
the results obtained on rise-times, sensitivity and
resistance to neutron irradiation up to a dose of
1015/cm2.
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| PM14 |
LHC Beam Loss Monitors
|
instrumentation, diagnostics, beam-losses, collider, simulation |
198 |
| |
- A.A. Garcia, B. Dehning, G. Ferioli, E. Gschwendtner
CERN, Geneva, Switzerland
| |
At the Large Hadron Collider (LHC) a beam loss
system will be installed for a continuous surveillance of
particle losses. These beam particles deposit their energy
in the super-conducting coils leading to temperature
increase, possible magnet quenches and damages.
Detailed simulations have shown that a set of six
detectors outside the cryostats of the quadrupole magnets
in the regular arc cells are needed to completely diagnose
the expected beam losses and hence protect the magnets.
To characterize the quench levels different loss rates
are identified. In order to cover all possible quench
scenarios the dynamic range of the beam loss monitors
has to be matched to the simulated loss rates. For that
purpose different detector systems (PIN-diodes and
ionization chambers) are compared.
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| PM17 |
First Beam Tests for the Prototype LHC Orbit and Trajectory System in the CERN-SPS
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instrumentation, diagnostics, pick-up, closed-orbit, collider, controls |
207 |
| |
- D. Cocq, L. Jensen, R. Jones, J.J. Savioz
CERN, Geneva, Switzerland
- D. Bishop, B. Roberts, G. Waters
TRIUMF, Vancouver, Canada
| |
The first beam tests for the prototype LHC orbit and
trajectory system were performed during the year 2000 in
the CERN-SPS. The system is composed of a wide-band
time normaliser, which converts the analogue pick-up
signals into a 10 bit position at 40MHz, and a digital
acquisition board, which is used to process and store the
relevant data. This paper describes the hardware involved
and presents the results of the first tests with beam.
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