| Paper |
Title |
Page |
| IT10 |
6-D Electron Beam Characterisation Using Optical Transition Radiation and Coherent Diffraction Radiation
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46 |
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- M. Castellano, V. Verzilov
INFN-LNF, Laboratori Nazionali di Frascati, Frascati, Italy
- L. Catani, A. Cianchi
INFN-Roma2, Roma, Italy
- G. D'Auria, M. Ferianis, C. Rossi
ELETTRA, Sincrotrone Trieste, Trieste, Italy
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The development of non-intercepting diagnostics for high charge density
and high energy electron beams is one of the main challenge of beam
instrumentation.
Diffraction Radiation based diagnostics, being non-intercepting, are
among the possible candidates for the measurements of beam properties for
the new generation linacs.
At the 1 GeV Sincrotrone Trieste linac, we are performing the first
measurements of beam transverse parameters using Diffraction Radiation
emitted by the electron beam passing through a 1 mm slit opened on a
screen made of aluminium deposited on a silicon substrate.
The analysis of the angular distribution of the Diffraction Radiation for
a given wavelength, slit aperture and beam energy gives information about
the beam size and its angular divergence.
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| CT03 |
Performance of the Digital BPM System for the Swiss Light Source
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69 |
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- V. Schlott, M. Dach, M. Dehler, R. Kramert, P. Pollet, T. Schilcher
PSI, Paul Scherrer Institut, Villigen, Switzerland
- M. Ferianis, R. DeMonte
ELETTRA, Sincrotrone Trieste, Trieste, Italy
- A. Košiček, R. Uršič
I-Tech, Instrumentation Technologies, Solkan, Slovenia
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The accelerator complex of the Swiss Light Source (SLS) is presently
under commissioning at the Paul Scherrer Institute (PSI) in Villigen,
Switzerland. The newly developed digital beam position monitor (DBPM)
system has been successfully used to determine beam positions in the
pre-injector LINAC, the transfer lines, the booster synchrotron and the
storage ring. Instant and free selection of operation modes through the
EPICS-based SLS control system allows to choose between single turn,
turn-by-turn and closed orbit measurements. The operational experience
and performance of the DBPM system is presented, based on measurements,
taken during SLS commissioning. A monitoring system (POMS), which
measures the horizontal and vertical mechanical positions of each BPM
block in reference to the adjacent quadrupole magnets has been installed
and first results, indicating transverse movements of the BPM blocks as
a function of current in the storage ring will be presented.
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| PM06 |
The Low Gap BPM System at ELETTRA: Commissioning Results
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174 |
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- M. Ferianis, R. De Monte
ELETTRA, Sincrotrone Trieste, Trieste, Italy
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Two Low Gap BPMs have been successfully installed
at ELETTRA and have now completed the commissioning
phase. The main purpose of these new devices is to
provide stable beam position measurement, at sub-micron
level, to monitor the stability of the light delivered to the
Users. The improvements with respect to the normal BPM
system have been obtained adopting both a new Low Gap
BPM sensor and a new non-multiplexed BPM detector,
the latter being developed in co-operation with the SLS
diagnostic group at the PSI. Beside the Closed Orbit
mode, thanks to the digitally selectable bandwidth, the
new BPM detector can be operated also in the Turn-by-Turn
mode and provide the position signal to feedback loops.
In this paper we first briefly review the system
architecture, describing its mechanical and electronic
parts. Then, we present the digital BPM detector set-up
used at ELETTRA and the associated firmware required
by the four-channel BPM detector to guarantee
performance over the full dynamic range. The BPMposition
monitoring system is also described and its
integration in the BPM system presented. Laboratory tests
confirmed sub-micron resolution at 10kHz data rate. A
series of beam based measurements have been performed
in order to test this system and to verify the improvement
in performance. The system is presently used in the
control room as a powerful beam quality monitor; its
extension to other Storage Ring straight sections is under
evaluation.
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