| Paper |
Title |
Page |
| IT05 |
Results with LHC Beam Instrumentation Prototypes
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21 |
| |
- 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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|
| CT08 |
Measuring Beta-Functions with K-Modulation
|
85 |
| |
- O. Berrig, C. Fischer, H. Schmickler
CERN, Geneva, Switzerland
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| |
The precise measurement of the local value of the beta-function at the
place of a beam size monitor is necessary for the precise determination
of the beam emittance. We developed a new method for the measurement of
the beta-function by using of continuous square-wave modulation of the
force of the quadrupole and by continuous tune tracking. Measurements
were performed at LEP in order to evaluate the precision that can be
achieved with this method in the LHC. The paper describes the method and
discusses in details the results obtained at LEP for colliding and
non-colliding beams.
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|
| PM15 |
Sensitivity Studies with the SPS Rest Gas Profile Monitor
|
201 |
| |
- G. Ferioli, C. Fischer, J. Koopman, M. Sillanoli
CERN, Geneva, Switzerland
|
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| |
During the SPS run in the year 2000 further test
measurements were performed with the rest gas monitor.
First, profiles of single circulating proton bunches were
measured and the bunch charge progressively reduced, in
order to determine the smallest bunch intensity which can
be scanned under the present operating conditions. The
image detector in this case was a CMOS camera.
Using a multi-anode strip photo-multiplier with fast
read-out electronics, the possibility to record profiles on a
single beam passage and on consecutive turns was also
investigated. This paper presents the results of these tests
and discusses the expected improvements for the
operation in 2001.
Moreover, the issue of micro channel plate ageing
effects was tackled and a calibration system based on
electron emission from a heating wire is proposed. The
gained experience will be used for the specification of a
new monitor with optimised design, to be operated both in
the SPS and in the LHC.
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