AC conductivity and Resistive Wall impedance of LHC collimator

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Presentation transcript:

AC conductivity and Resistive Wall impedance of LHC collimator A.Grudiev RLC team meeting 18.03.05

AC conductivity and Resistive Wall impedance of circular pipe of radius a K. L. F. Bane, SLAC/AP-87, (1991) A.V. Fedotov, R.L.Gluckstern, M. Venturini, PRST-AB 2, (1999)

Properties of materials Cu Graphite parallel perp. Carbon-Carbon DC conductivity: σ [(Ohmm)-1] 5.8x107 2.5x106 8.3x102 1x105 Free carrier density: n [m-3] 8.5x1028 6x1024 (4.4x1024)* Density [kg/m3] 8920 2260 1650 * - scaled from graphite proportionally to the density

Transverse Impedance (a = 2mm; Copper)

Transverse Impedance (a = 2mm; Graphite parallel)

Transverse Impedance (a = 2mm; Carbon-Carbon)

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