Paper |
Title |
Other Keywords |
Page |
CT09 |
Luminosity Optimization in DAΦNE
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luminosity, diagnostics, feedback, synchrotron |
82 |
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- F. Sannibale
INFN-LNF, Laboratori Nazionali di Frascati dell'INFN, Frascati, Italy
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DAΦNE the Frascati F-factory, started the two beams
commissioning on March 1998. Since then a relevant
amount of experience concerning the techniques and procedures
for optimizing the luminosity has been acquired.
All the schemes used are strongly based on the use of
various diagnostic systems including a dedicated luminosity
monitor, orbit measurement, tune monitor, synchrotron
light monitor and others. A summary of the used
techniques, with accent on the diagnostic aspects, is
presented.
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PT11 |
Dipole modes study by means of HOM couplers at SBTF
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kicker, dipole, pick-up, damping |
183 |
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- N. Baboi, M. Dohlus, A. Jöstingmeier, N. Holtkamp, M. Wendt, M. Nagl, J. Boster, H. Hartwig
DESY, Deutsches Elektronen Synchrotron, Hamburg, Germany
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High order modes (HOM) are generated by the interaction
of a bunched beam with an accelerator environment. They
may act destructively on following particle bunches, leading
to an increase of the transverse oscillation amplitude
and finally to the deterioration of the emittance. Dipole
modes have been studied at the S-Band Test Facility at
DESY. One accelerating structure, specially designed for
this test linac, is equipped with waveguide pick-ups for
measuring the HOMs. For one part of the experiments, a
modulation of the transverse offset of the bunches at the
structure entrance has been induced using a fast broadband
kicker and the effect was measured with a precise stripline
BPM. No high impedance modes were clearly found in the
structure, which has been detuned and damped by both the
tapered geometry of the structure and an absorbing stainless
steel coating applied on the iris tips.
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