| Paper |
Title |
Page |
| TUPCH114 |
A Ridged Circular Waveguide Ferrite Load for Cavity HOM Damping
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1280 |
| |
- E. Weihreter, V. Duerr, F. Marhauser
BESSY GmbH, Berlin
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A normal conducting HOM damped 500 MHz prototype cavity has been tested with three tapered circular double ridged waveguide to coaxial transitions as HOM couplers, featuring maximum longitudinal and transverse HOM impedances below 5 kOhm and 200 kOhm/m respectively. Numerical simulations indicate that these impedance levels can be further reduced by more than a factor of 3 using homogeneous circular double ridged waveguides for improved coupling to the HOMs. In the present paper the layout of an optimised homogeneous waveguide with "in vacuum" ferrite tiles is presented, including mechanical and thermal design considerations. Low power reflectrometry measurements demonstrate good matching of a prototype load, and high power tests of the ferrite absorber elements indicate that the waveguide load is well suited for the cavity HOM power levels present in state of art 3rd generation SR sources.
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| WEPCH109 |
Comprehensive Benchmark of Electromagnetic 3D Codes in Time and Frequency Domain
|
2167 |
| |
- V. Serriere, N. Guillotin, J. Jacob
ESRF, Grenoble
- F. Marhauser, E. Weihreter
BESSY GmbH, Berlin
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A comprehensive benchmark of todays most powerful numerical 3D Eigenmode and Time Domain Solvers has been performed using the input geometry of a HOM-damped cavity and a highly lossy waveguide load developed at BESSY. The paper details the simulations results together with existing experimental data.
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| THPLS014 |
Status of the Metrology Light Source
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3299 |
| |
- K. Buerkmann-Gehrlein, M. Abo-Bakr, W. Anders, P. Budz, O. Dressler, V. Duerr, J. Feikes, H.G. Hoberg, D. Krämer, P. Kuske, R. Lange, J. Rahn, T. Schneegans, D. Schueler, E. Weihreter, G. Wuestefeld
BESSY GmbH, Berlin
- R. Klein, G. Ulm
PTB, Berlin
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For more than 25 years, the Physikalisch-Technische-Bundesanstalt (PTB) uses synchrotron radiation at the storage rings BESSY I and II for photon metrology in the spectral range of UV to x-rays. Since decommissioning of BESSY I (1999), there is a gap in the spectral range of UV and EUV wavelength due to the higher electron energy of BESSY II. Thus, in 2003, the Metrology Light Source (MLS), a low energy electron storage ring, was approved, as central instrument in the future Willy Wien Laboratory (WWL). Design, construction and operation of the MLS are realized by BESSY, based on the PTB requirements for a permanent accessible radiometry source, optimized for the spectral range between UV up to VUV. The MLS is tuneable in energy between 200 MeV and 600 MeV, designed for currents between 1pA up to 200mA. Civil construction of WWL in the close vicinity to BESSY is nearing completion. The first MLS components will be installed in spring 2006, commissioning of the 100MeV Microtron is scheduled for summer 2006, while commissioning of the storage ring will start in spring 2007. Regular user operation will begin in January 2008. A status and an overview on the construction of the MLS are
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