| Paper |
Title |
Page |
| PM14 |
LHC Beam Loss Monitors
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198 |
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- A.A. Garcia, B. Dehning, G. Ferioli, E. Gschwendtner
CERN, Geneva, Switzerland
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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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| PM15 |
Sensitivity Studies with the SPS Rest Gas Profile Monitor
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201 |
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- 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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