Beam Coupling Impedance of the LHC TCTP Collimators
Hugo Day, Fritz Caspers, Alessandro Dallocchio, Luca Gentini, and Alexej Grudiev, Elias Metral, Roger Jones, Benoit Salvant
TL;DR
This paper evaluates the beam coupling impedance of the LHC TCTP collimators through simulations to identify potential instabilities and heating issues, supporting upgrades to the LHC collimation system.
Contribution
It provides detailed impedance simulations of the TCTP collimators, focusing on trapped modes and cavity resonances relevant for beam stability and safety.
Findings
Identification of potential trapped modes and cavity resonances.
Assessment of beam-induced heating risks.
Insights into the impact of collimator design on beam stability.
Abstract
As part of an upgrade to the LHC collimation system, 8 TCTP and 1 TCSG collimators are proposed to replace existing collimators in the collimation system. In an effort to review all equipment placed in the accelerator complex for potential side effects due to collective effects and beam-equipment interactions, beam coupling impedance simulations are carried out in both the time-domain and frequency-domain of the full TCTP design. Particular attention is paid to trapped modes that may induce beam instabilities and beam-induced heating due to cavity modes of the device.
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Taxonomy
TopicsGyrotron and Vacuum Electronics Research · Particle Accelerators and Free-Electron Lasers · Particle accelerators and beam dynamics