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Levinsen, Y.I.

Paper Title Page
TU5PFP012 Statistical Modeling of DC Sparks 833
 
  • Y.I. Levinsen, S. Calatroni, A. Descoeudres, M. Taborelli, W. Wuensch
    CERN, Geneva
  
 

The understanding of electrical breakdowns has a critical role in the design of the RF accelerating cavities for the CLIC linear collider. In this context a new statistical model of the conditioning process and breakdown rate evolution is presented for a DC spark system with tip-plane electrode geometry charged from a capacitance. The approach requires a small amount of assumptions, but can still make several interesting predictions. Electrode gap distance dependence on the saturated breakdown field and spitfest (grouped breakdowns) are among the phenomena that could be explained from this simple model.

  
TU5PFP013 Quantitative Outgassing Studies in DC Electrical Breakdown 836
 
  • Y.I. Levinsen, S. Calatroni, A. Descoeudres, M. Taborelli, W. Wuensch
    CERN, Geneva
  
 

Electrical breakdown in the accelerating cavities set a potential limit to the performance of the CLIC linear collider. Vacuum degradation and beam instability are possible outcomes from a breakdown if too much gas is released from the cavity surface. Quantitative data of gas release are provided for copper electrodes (milled Cu-OFE, as-received and heat-treated), and molybdenum electrodes. These data are produced from a controlled DC spark environment with capacitance charged anode at fixed energy.

  
WE6PFP016 Study of High Beta Optics Solution for TOTEM 2516
 
  • H. Burkhardt, Y.I. Levinsen, S.M. White
    CERN, Geneva
  
 

The TOTEM experiment requires special high beta optics solutions. We report on studies of optics for an intermediate beta* = 90 m, as well as a solutions for a very high beta* of 1540 m, which respect all known constraints. These optics are rather different from the normal physics optics and will require global tune changes or adjustments.

  
TH5PFP011 Simulation of Beam-Gas Scattering in the LHC 3208
 
  • Y.I. Levinsen, H. Burkhardt
    CERN, Geneva
  • V. Talanov
    IHEP Protvino, Protvino, Moscow Region
  
 

We report on background studies for the LHC with detailed simulations. The simulations now include generation of beam-gas scattering in combination with multiturn tracking of protons. Low beta optics and available aperture files for this configuration have been used to generate loss maps according to the pressure distribution in the LHC.