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kicker

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MOPD08 Bunch by Bunch Feedback System using iGp at KEK-PF feedback, vacuum, betatron, single-bunch 59
 
  • M. Tobiyama, J.W. Flanagan, T.M. Mitsuhashi, T. Obina, M. Tadano, R. Takai
    KEK, Ibaraki
  
 

A transverse bunch by bunch feedback system using iGp feedback processors has been tested at the KEK-PF. The system consists of a bunch position detection system using 1.5 GHz components of the beam (3 x fRF), iGp feedback signal processors, and a transverse feedback kicker with a high power amplifier. It shows sufficient performance to suppress instabilities completely up to a beam current of 450mA. Results of the mode analysis of the instabilities using the grow-damp function of the iGp are also shown.

  
MOPD17 Performance of Exponential Coupler in the SPS with LHC Type Beam for Transverse Broadband Instability Analysis pick-up, single-bunch, coupling, electron 83
 
  • R. de Maria
    BNL, Upton, Long Island, New York
  • J.D. Fox
    SLAC, Menlo Park, California
  • W. Höfle, G. Kotzian, G. Rumolo, B. Salvant, U. Wehrle
    CERN, Geneva
  
 

We present the performance and limitations of the SPS exponential coupler for transverse instability measurements with LHC type beam. Data were acquired in 2008 in the SPS in the time domain with a bandwidth of up to 2.5 GHz. The data were filtered to extract the time evolution of transverse oscillations within the less than 5ns long LHC type bunches. We describe the data filtering techniques and reveal the limitations of the pick-up due propagating modes.

  
MOPD18 Design of the Stripline Kickers for ALBA impedance, feedback, damping, coupling 86
 
  • U. Iriso, T.F. Günzel, F. Peréz
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès
  
 

The design of the stripline kickers shall be adapted to match the line impedance, maximize the effective beam kick, reduce the heat load and minimize the transverse coupling impedance. These kickers are used for either tune measurements or transverse feedback. We describe the ALBA design of these kickers for both Booster and Storage Ring.

  
MOPD43 Implementation of the Electronics Chain for the Bunch by Bunch Intensity Measurement Devices for the LHC feedback, controls, extraction, high-voltage 137
 
  • D. B. Belohrad, O.R. Jones, M. Ludwig, J.-J. Savioz, S. Thoulet
    CERN, Geneva
  
 

The fast beam intensity measurements for the LHC are provided by eight Fast Beam Current Transformers (FBCT). Four FBCTs installed in the LHC rings are capable of providing both bunch-by-bunch and total turn-by-turn beam intensity information. A further four FBCTs, two in each of the LHC dump lines, are used to measure the total extracted beam intensity. In addition to providing intensity information the ring FBCTs also send signals to the machine protection system. This increases the complexity of both the RF front-end and the digital acquisition parts of the signal processing chain. The aim of this paper is to discuss the implemented hardware solution for the FBCT system, in particular with respect to the signal distribution, FPGA signal processing, calibration, and interaction of the FBCTs with the machine protection chain.