Paper |
Title |
Other Keywords |
Page |
TUPCH018 |
Fast Beam Dynamics Investigation Based on an ADC Filling Pattern Measurement
|
synchrotron, controls, diagnostics, storage-ring |
1034 |
|
|
|
TUPCH129 |
Conceptual Design of a 3rd Harmonic Cavity System for the LNLS Electron Storage Ring
|
electron, storage-ring, damping, synchrotron |
1316 |
|
- N.P. Abreu, O.R. Bagnato, R.H.A. Farias, M.J. Ferreira, C. Pardine, P.F. Tavares
LNLS, Campinas
|
The installation of a second RF cavity in the UVX electron storage ring at the Brazilian Synchrotron Light Laboratory (LNLS) at the end of 2003 brought about longitudinal instabilities driven by one of the HOMs of the new cavity. Even though the operational difficulties related to these unstable modes were successfully overcome by means of a combination of cavity tuning (using temperature and plunger adjustments) with phase modulation of the RF fields at the second harmonic of the synchrotron frequency, a more appropriate technique to avoid those problems is the use of higher harmonic cavities, which have the important advantage of providing damping of the longitudinal modes without increasing the energy spread, i.e., without compromising the longitudinal emittance. In this work we present the design of a passive higher harmonic cavity system optimized for operation at the LNLS storage ring. The parameters for a set of cavities as well as the analysis of some of the effects that they may introduce in the beam dynamics are presented. An overview of the technical aspects related to the project, construction and installation of the cavities in the storage ring is also presented.
|
|
|
|
THPCH035 |
Characterisation of the EU-HOM-damped Normal Conducting 500 MHz Cavity from the Beam Power Spectrum at DELTA
|
impedance, synchrotron, single-bunch, storage-ring |
2856 |
|
- R.G. Heine, P. Hartmann, T. Weis
DELTA, Dortmund
|
A HOM-damped prototype cavity developed in the framework of an EC collaboration has been installed into the Dortmund synchrotron light source DELTA. This paper reports on beam studies performed at beam energies of 1.5 GeV and 542 MeV in an attempt to get information on coupled bunch instability thresholds. In addition an evaluation of the longitudinal cavity impedance is presented, based on beam power spectra up to 3 GHz for different filling patterns of the storage ring by analysing the RF signal from the HOM-dampers.
|
|
|
|