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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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