An electron-positron storage ring modelled on LEP stores bunches per beam

PHYSICS · Subjective · Fermi University Physics · Particle Physics & Quantum Fields · Particles, interactions and experiment · Particles, interactions and experiment

Symmetry and Flavour, Ch The collider experiment: from bunch populations to a measured cross section

Problem

An electron-positron storage ring modelled on LEP stores

n_b = 4

bunches per beam, each with

N = 3.0\times10^{11}

particles, revolving at

f_{\rm rev} = 44\,\mathrm{kHz}

. The beams are flat at the interaction point, with

\sigma_x^* = 200\,\mu\mathrm{m}

and

\sigma_y^* = 8\,\mu\mathrm{m}

, colliding head on (

F=1

). Calculate the instantaneous luminosity in

\mathrm{cm^{-2}s^{-1}}

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