Author: Marques, S.R.
Paper Title Page
MOPC09 Development of the Sirius RF BPM Electronics 63
  • D.O. Tavares, R.A. Baron, F.H. Cardoso, S.R. Marques, J.L.B. Neto, L.M. Russo
    LNLS, Campinas, Brazil
  • A.P. Byszuk, G. Kasprowicz, A.J. Wojenski
    Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
  A BPM system has been developed for the new low emmitance 3 GeV Brazilian synchrotron light source, Sirius. The Sirius BPM electronics is a modular system based on a PICMG(R) MicroTCA.4 platform using ADC mezzanine cards in ANSI/VITA 57.1 FMC form factor and standalone RF front-end boards. It has been designed under the CERN Open Hardware License (OHL) in a collaboration between Brazilian Synchrotron Light Laboratory (LNLS) and Warsaw University of Technology (WUT). This paper presents: i) overall architecture of the BPM system; ii) performance evaluation of the first prototype of the BPM electronics comprehending beam current, filling pattern and temperature dependencies as well as resolution vs. beam current; and iii) preliminary results with beam at LNLS's UVX storage ring.  
poster icon Poster MOPC09 [1.451 MB]  
TUPC07 Design and Impedance Optimization of the SIRIUS BPM Button 365
  • H.O.C. Duarte, S.R. Marques, L. Sanfelici
    LNLS, Campinas, Brazil
  Design of several BPM Buttons is presented with detail impedance, heat transfer and mechanical analysis. Special attention is given to the application of ceramics as materials with low relative permittivity inside of the BPM Button and to the geometric shape of the BPM Button. The heat dissipation is evaluated based on the loss factor calculated for a 2.65mm bunch length. The narrow-band impedance is discussed and its dependence on applied ceramic materials is compared.  
poster icon Poster TUPC07 [1.715 MB]  
TUPC08 Design and Impedance Optimization of the LNLS-UVX Longitudinal Kicker Cavity 369
  • L. Sanfelici, H.O.C. Duarte, S.R. Marques
    LNLS, Campinas, Brazil
  Performance evolution of parameters achieved during the electromagnetic design of the longitudinal kicker cavity for the LNLS UVX storage ring is presented. The effort on the electromagnetic optimization process of the heavily loaded cavity has been made to reach the required electrodynamic parameters of the kicker. The results for three different geometries are compared and a good compromise between the longitudinal shunt impedance and the effect of the longitudinal Higher Order Modes (HOM’s) on beam stability has been found.  
poster icon Poster TUPC08 [1.365 MB]  
WEPC07 Development of the RF Front End Electronics for the SIRIUS BPM System 670
  • R.A. Baron, F.H. Cardoso, S.R. Marques, J.L.B. Neto
    LNLS, Campinas, Brazil
  • J.-C. Denard
    SOLEIL, Gif-sur-Yvette, France
  Tight stability requirements for new low emittance light sources, such as SIRIUS being built in Brazil, strongly depend on the BPM RF Front-End performance. Small nonlinearities, uneven temperature drifts and excess noise can spoil the performance of the whole digital BPM system and orbit correction. Calibration and temperature control schemes have been tested in order to suppress position measurement drifts during user beam delivery down to a fraction of micrometer. A method for measuring electronic component nonlinearities at mdB scale is also presented.  
poster icon Poster WEPC07 [1.236 MB]