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Title |
Other Keywords |
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| PM14 |
LHC Beam Loss Monitors
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instrumentation, diagnostics, beam-losses, LHC, collider |
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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| PM21 |
DSP and FPGA Based Bunch Current Signal Processing
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instrumentation, diagnostics, ESRF, closed-orbit, controls |
219 |
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- G.A. Naylor
ESRF, Grenoble, France
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The current in electron storage rings used as synchrotron light sources
must be measured to a very high precision in order to determine the
stored beam lifetime. This is especially so in high-energy machines in
which the lifetime may be very high. Parametric current transformers
(PCT) have traditionally been used to measure the DC or average current
in the machine, which offer a very high resolution. Unfortunately these
do not allow the different components of a complex filling pattern to be
measured separately. A hybrid filling mode delivered at the ESRF consists
of one third of the ring filled with bunches with a single highly
populated bunch in the middle of the two-thirds gap. The lifetime of
these two components may be very different. Similarly the two components
are injected separately and can be monitored separately using a fast
current transformer (FCT) or an integrating current transformer (ICT).
The signals from these devices can be analysed using high speed analogue
to digital converters operating at up to 100MHz and digital signal
processing (DSP) techniques involving the use of field programmable gate
arrays (FPGAs) in order to process the continuous data stream from the
converters.
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