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scattering

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WEAY05 New experimental results on electron cooling at COSY-Juelich electron, proton, injection, ion 223
 
  • J. Dietrich
    FZJ, Jülich
  Recent electron cooling results of a proton beam at COSY – Juelich are summarized. The influence of residual gas ions trapped in the electron beam on the cooled beam stability as well as methods to suppress the instabilities are described. Results on the numerical simulation for the formation of a crystalline proton beam in COSY using the BETACOOL code and results of experimental investigations of the cooling process at extremely low proton beam intensity are reported. Future plans are briefly addressed.  
 
WEBY04 Refined Models of Intrabeam Scattering proton, emittance, damping, coupling 265
 
  • F. Zimmermann, F. Ruggiero
    CERN, Geneva
  We discuss two extensions of intrabeam-scattering theory. First, starting from the Bjorken-Mtingwa recipe, general formulae are derived for the three electro-magnetic intrabeam scattering growth rates, including non-ultrarelativistic terms and vertical dispersion, but maintaining a Gaussian beam approximation. A few applications demonstrate the importance of the vertical dispersion. Second, aside from electromagnetic interactions, hadrons may also undergo nuclear scattering off each other. We estimate the magnitude of this process, and argue that the loss rate due to “nuclear intrabeam scattering” could become significant in high-energy proton or ion storage rings, such as the LHC.  
 
WEBZ03 A New High Rate Charged Particles Detector hadron, controls, kaon, proton 256
 
  • Ph. Legou
    CEA, Gif-sur-Yvette
  Sextant is a new Beam Spectrometer. This detector is based on a Time Projection Chamber(TPC)principle, using a gaseous detector called Micromegas. Thus, we have a better efficiency, with the minimum amount of material in the way of the beam. Moreover, using the TPC technique, the Mesh of the detector is positioned outside the high intensity region covered by the beam. Peformances of this detecor are very good in a high intensity hadron beams (spatial resolution : 70μm and time resolution 600ps). The integration of the front end on the PCB led to a very low noise for the entire detector. Main characteristics of the preamplifier are 1ns of rise time and a very low noise, lower than 600 μV rms. Sextant is an evolution of KABES, a beam spectrometer on NA 48II at CERN. This concept have shown very good performances and robustness.  
 
FRAP05 Summary of Working Group D electron, ion, simulation, beam-cooling 372
 
  • A. V. Fedotov, J. Wei
    BNL, Upton, Long Island, New York
  • I. N. Meshkov
    JINR, Dubna, Moscow Region