| Paper |
Title |
Other Keywords |
Page |
| IT05 |
The Comparison of signal Processing Systems for Beam Position Monitors
|
collider, single-bunch, electron, storage-ring |
12 |
| |
- G. Vismara
CERN, Geneva, Switzerland
| |
At first sight the problem of determining the beam
position from the ratio of the induced charges of the
opposite electrodes of a beam monitor seems trivial, but
up to now no unique solution has been found that fits the
various demands of all particle accelerators.
The purpose of this paper is to help instrumentalist in
choosing the best processing system for their particular
application.
The paper will present the different families in which
the processing systems can be grouped.
A general description of the operating principles with
relative advantages and disadvantages for the most
employed processing systems is also presented.
|
|
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|
| PS11 |
Ionisation profile monitor tests in the SPS
|
electron, ion, proton, space-charge |
123 |
| |
- C. Fischer, J. Koopman
CERN, Geneva, Switzerland
| |
A beam profile monitor, from DESY, based on the ionisation
of the rest gas, was installed in the SPS in 1997. Horizontal
beam profiles obtained from the extracted positive ions are
presented. It is known that in this case some broadening affects
the signal, which limits the monitor resolution. This broadening
results from the transverse momentum that the ions gain
within the space charge field of the circulating beam.
In order to improve the resolution for LHC applications, the
monitor was modified during the 1998/99 winter stop. A magnetic
focusing was incorporated. The aim is to analyse the signal
provided by collecting the electrons, rather than the ions,
of the ionised rest gas. The details of this new set-up and the
expectations for the resolution limit will be compared to the
measurement results.
|
|
|
|
| PT08 |
A fast protection system for narrow-gap insertion device vessels
|
monitoring, beam-losses, insertion-device, injection |
174 |
| |
- M.J. Dufau, R.J. Smith
CLRC, Daresbury Laboratory, Warrington, UK
| |
Presented in this paper are details of an electronic,
beam position based interlock system, which has been
designed to protect narrow - gap insertion device vessels
from the thermal damage that would result from mis
steered beam. Details of system design and operational
experience are presented, and the paper concludes with an
outline proposal for a system enhancement, that would
offer diagnostic information immediately prior to an
excessive beam displacement trip.
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