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The LHC collimators have very complicated mechanical designs includingmovable jaws made of higly resistive materials, ferrite materials, tiny RFcontacts. Since the jaws are moved very close to the circulating beams theircontribution in the overall LHC coupling impedance is dominant, with respect toother machine components. For these reasons accurate simulation of collimators'impedance becomes very important and challenging. Besides, several dedicatedtests have been performed to verify correct simulations of lossy dispersivematerial properties, such as resistive wall and ferrites, benchmarking coderesults with analytical, semi-analytical and other numerical codes outcomes.Here we describe all the performed numerical tests and discuss the results ofLHC collimators' impedances and wake fields calculations.

Numerical Calculations of Wake Fields and Impedances of LHC Collimators' Real Structures