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Discontinuities in the geometry of a beam pipe can represent serious issues for the stability of the beam in a particle accelerator. Many devices installed along the machine introduce parasitic cavities which are undesired and give rise to wake fields and resonances, which on turn contribute in destabilizing the beam. These resonances are often damped using dispersive or resistive materials placed...
When a particle beam travels through an accelerator structure like the LHC, energy is lost to the structure itself. This phenomenon is described through the beam-coupling impedance and is ideally reduced to improve beam quality and energy efficiency. In this paper, the use of metamaterials with negative permeability is investigated as a method of reducing impedance. A fast and cost-effective way of...
The control electronics of the LHC collimators stepping motors will be located in radiation safe zones up to 800 meters far from the motors. With such cable lengths the standard chopping drivers do not work properly because of the voltage losses on the cable and even more because of the high cable capacitance. The capacitance in fact produces a ringing phenomenon on the driver feedback current that...
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