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Title: Simulator for beam-based LHC collimator alignment
Authors: Valentino, Gianluca
Aßmann, Ralph
Redaelli, Stefano
Sammut, Nicholas
Keywords: Colliders (Nuclear physics)
Collimators (Optical instrument) -- Calibration
Beam optics
Particle beams, Colliding
Issue Date: 2014
Publisher: American Physical Society
Citation: Valentino, G., Aßmann, R., Redaelli, S., & Sammut, N. (2014). Simulator for beam-based LHC collimator alignment. Physical Review Special Topics-Accelerators and Beams, 17(2), 021003.
Abstract: In the CERN Large Hadron Collider, collimators need to be set up to form a multistage hierarchy to ensure efficient multiturn cleaning of halo particles. Automatic algorithms were introduced during the first run to reduce the beam time required for beam-based setup, improve the alignment accuracy, and reduce the risk of human errors. Simulating the alignment procedure would allow for off-line tests of alignment policies and algorithms. A simulator was developed based on a diffusion beam model to generate the characteristic beam loss signal spike and decay produced when a collimator jaw touches the beam, which is observed in a beam loss monitor (BLM). Empirical models derived from the available measurement data are used to simulate the steady-state beam loss and crosstalk between multiple BLMs. The simulator design is presented, together with simulation results and comparison to measurement data.
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