| Paper |
Title |
Page |
| CT08 |
Adaptive Optics for the LEP 2 Synchrotron Light Monitors
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77 |
| |
- G. Burtin, R.J. Colchester, G. Ferioli, J.J. Gras, R. Jung, J.M. Vouillot
CERN, Geneva, Switzerland
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| |
The image obtained with the LEP synchrotron
radiation telescopes deteriorates, giving multiple and
deformed images, when the beam energy goes beyond
80 GeV at beam currents above 2 mA. This problem is
due to the deformation of the light extracting beryllium
mirror, by as little as 1 mm, and had been predicted at
the design stage. To overcome this problem, several
changes together with an adaptive optics set-up have
been introduced. These essentially consist of a
cylindrically deformable mirror to compensate the
cylindrical deformation of the beryllium mirror and a
movable detector to compensate the spherical
deformation. Both components are continuously
adjusted as a function of beam current and energy.
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| CT11 |
The OTR Screen Betatron Matching Monitor of the CERN SPS
|
90 |
| |
- C. Bovet, R.J. Colchester, G. Ferioli, J.J. Gras, R. Jung, J.M. Vouillot
CERN, Geneva, Switzerland
|
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| |
In order to satisfy the stringent emittance
requirements of LHC, betatron matching monitors,
based on multiturn beam profile measurements, have
been proposed for the SPS and LHC. A test monitor
has been installed for evaluation in the CERN SPS first
in 1996 and improved in 1997. It is based on an OTR
screen and a fast beam profile acquisition system. It
has been used with proton beams to assess the quality
of the betatron matching from the PS to the SPS in
1998. Experience and results are presented.
|
|
| CT12 |
Preliminary Test of a Luminescence Profile Monitor in the CERN SPS
|
95 |
| |
- J. Camas, R.J. Colchester, G. Ferioli, R. Jung, J. Koopman
CERN, Geneva, Switzerland
|
|
| |
In order to satisfy the tight emittance requirements of
LHC, a non-intercepting beam profile monitor is needed
in the SPS to follow the beam emittance evolution during
the acceleration cycle from 26 to 450 GeV. Beyond 300
GeV, the synchrotron light monitor can be used. To cover
the energy range from injection at 26 GeV to 300 GeV, a
monitor based on the luminescence of gas injected in the
vacuum chamber has been tested and has given
interesting results. This monitor could also be used in
LHC, where the same problem arises. Design and results
are presented for the SPS monitor.
|
|
| PS14 |
Comparative test results of various beam loss monitors in preparation for LHC
|
132 |
| |
- J. Bosser, G. Ferioli
CERN, Geneva, Switzerland
|
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| |
Beam loss detectors will play an important role in the
protection of the superconducting LHC magnets.
Different types of detectors have been tested in the SPS
ring and secondary beam lines with a view to their
possible use for this application.
This paper describes the measurements made with:
microcalorimeters at cryogenic temperatures, PIN diodes,
ionisation chambers, scintillators, and ACEMs.
Measurements made using proton beams showing their
relative sensitivities, linearities in counting or analog
mode and minimum detection level will be presented.
|
|
| PS15 |
Beam profile measurements at 40 MHz in the PS to SPS transfer channel
|
135 |
| |
- G. Ferioli, J.J. Gras, H. Hiller, R. Jung
CERN, Geneva, Switzerland
|
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| |
Bunch to bunch beam profile measurements provide a
valuable tool to control the injection lines to the SPS.
A fast profile monitor based on a 2.5μm Mylar coated
with Aluminium Optical Transition Radiation (OTR)
radiator, has been developed, installed and tested in the
transfer line between the PS and SPS.
The OTR beam image is focused onto a fast Linear
Multianode Photo Multiplier Tube and the associated
electronics sample and store profiles every 25ns.
The paper describes the detector design, the electronic
processing, and presents the results of different
measurements made with bunches of 109-1011 protons at 26
GeV, and bunches of 106 Pb82+ ions at 5.11 GeV/u.
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