2015/11/04 by Oscar Frasciello, Frasciello, Oscar, Mikhail Zobov +1
Physics and Astronomy · #Accelerator Physics (physics.acc-ph) #FOS: Physical sciences #physics.acc-ph
paper · pdf · doi:10.48550/arxiv.1511.01236
Invited Talk at ICAP 2015, Shanghai, China, 11 pages, 11 figures
arxiv created 2015/11/04 · arxiv updated 2015/11/05
The LHC collimators have very complicated mechanical designs including movable jaws made of higly resistive materials, ferrite materials, tiny RF contacts. Since the jaws are moved very close to the circulating beams their contribution in the overall LHC coupling impedance is dominant, with respect to other machine components. For these reasons accurate simulation of collimators' impedance becomes very important and challenging. Besides, several dedicated tests have been performed to verify correct simulations of lossy dispersive material properties, such as resistive wall and ferrites, benchmarking code results with analytical, semi-analytical and other numerical codes outcomes. Here we describe all the performed numerical tests and discuss the results of LHC collimators' impedances and wake fields calculations.