Paper |
Title |
Other Keywords |
Page |
PT02 |
Pill-Box Cavity BPM For TESLA Cryomodul
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diagnostics, linac, monitoring, position, resonance |
172 |
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- V. Sargsyan
TU-Berlin, Technische Universität, Berlin, Germany
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A new cavity BPM with 10 μm resolution is designed and fabricated
to perform single bunch measurements at the TESLA linear collider. In
order to have a low energy dissipation in the cryogenic supermodule, the
inner surface of the cavity is copper plated. Cross-talk is minimised by
a special polarisation design. The electronics, at 1.5 GHz, is a homodyne
receiver normalised to the bunch charge. Its LO-signal for
down-conversion is taken from the same cavity.
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PT17 |
Impedance-Matching-Transformer for Capacitive Pick-Ups
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BPM, diagnostics, longitudinal transfer function, impedance matching transformer, capacitive pick-up, SIS |
208 |
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PT21 |
Microwave measurement of intra bunch charge distributions
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diagnostics, instrumentation |
219 |
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- M. Dehler
PSI, Paul Scherrer Institut, Villigen, Switzerland
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A direct way of obtaining intra bunch charge distributions is to measure
the amplitude roll off as well as the phase behavior of the spectrum of
the single bunch self field. To that effect, a microwave pickup together
with a microwave front end has been installed in the storage ring of the
Swiss Light Source (SLS). As pickup, button type bpms are used,
which have been designed for a broad band behavior in the excess of 30
GHz. Three bpms together with their individual front ends are used in
order to sample the beam spectrum at frequencies of 6, 12 and 18 GHz,
which compares to the standard spectrum of a 1 mA single bunch extending
to approximately 12 GHz (13 ps rms bunch length). The signals are mixed
to base band in loco using the multiplied RF frequency as a LO. By
shifting the LO phase, simultaneously the amplitude roll off as well the
complex phase of the beam spectrum can be obtained. Where using a
resonator as a pickup would smear out the response over several bunches,
allowing only the determination of average values, the current setup has
a band width of approximately 2 GHz, so that individual bunches in the
500 MHz bunch train can easily be resolved.
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