Abstract
The Large Hadron Collider at CERN is equipped with a collimation system to intercept potentially dangerous beam halo particles before they damage its sensitive equipment. The collimator settings are determined following a beam-based alignment procedure, in which the collimator jaws are moved towards the beam until losses appear in the beam loss monitors. When the collimator reaches the beam envelope, beam losses propagate mainly in the direction of the beam and are, therefore, also observed by other nearby beam loss monitors. This phenomenon is known as cross talk. Due to this, collimators are aligned sequentially to be able to identify which losses are generated by which collimator, such that any cross talk across beam loss monitors positioned close to each other is avoided. This paper seeks to quantify the levels of cross-talk observed by beam loss monitors when multiple collimators are moving, to be able to determine the actual beam loss signals generated by their corresponding collimators. The results obtained successfully predicted the amount of cross-talk observed for each of the cases tested in this study. This was then extended to predict loss map case studies and the proton impacts at each collimator by comparing them to simulations.
Highlights
The Large Hadron Collider (LHC) at CERN is designed to collide two counterrotating beams with an unprecedented center-of-mass energy of 14 TeV [1]
This paper seeks to quantify the levels of cross-talk observed by beam loss monitors when multiple collimators are moving, to be able to determine the actual beam loss signals generated by their corresponding collimators
This motivated a study on the cross talk between collimators in IR7, and this paper seeks to quantify the level of cross talk in beam loss monitoring (BLM) signals, following dedicated beam tests performed in the LHC
Summary
The Large Hadron Collider (LHC) at CERN is designed to collide two counterrotating beams with an unprecedented center-of-mass energy of 14 TeV [1]. Interact elastically, changing its momentum, and continue its trajectory In both cases, additional signals, referred to as cross talk, could be measured by BLM devices placed downstream from the initial interactions. It would be beneficial to quantify the cross-talk experienced at a selected beam loss monitor, in cases such as collimator alignment or predicting the main plane of losses This motivated a study on the cross talk between collimators in IR7, and this paper seeks to quantify the level of cross talk in BLM signals, following dedicated beam tests performed in the LHC.
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