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- M. Werner, K. Wittenburg
DESY, Deutsches Elektronen-Synchrotron, Hamburg, Germany
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Wires scanners are standard instruments for beam size measurements in
storage rings: A wire is crossing the beam at a given speed and the
secondary emission current of the wire and/or the photomultiplier signals
produced from Bremsstrahlung or particles scattered at the wire are
recorded together with the wire positions. The control unit described
here is based on a previous CERN design. It now has additional features:
Triggered fast scans (1m/s) with a trigger uncertainty below ±30μs
(mechanics + electronics) used at the TTF Linac and at the proton
synchrotron DESY III, Slow scans (e.g. 50μm/s) for the TTF Linac,
Positioning of the wire within ±3μm for tail scans at the storage
rings PETRA and HERA, A 10.5MHz data acquisition rate for bunch-by-bunch
acquisitions in the accelerators at DESY. Another important design goal
was the compatibility with CERN scanners; it is foreseen to operate them
at LHC with the new control unit. First measurements with the new control
unit at TTF and HERA will be presented.
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