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Description
Beam Position Monitors (BPMs) are used as part of normal routines to measure the dipole component of a charged particle beam in order to determine its transverse position. However, BPMs are also sensitive to higher-order moments of the beam charge distribution, including the quadrupolar component, which provides access to the difference in horizontal and vertical beam RMS sizes. This work investigates the feasibility of extracting the quadrupolar component of the proton beam of the ESS superconducting linac (SCL) through the BPMs. The theoretical framework for quadrupolar signal formation is reviewed, with emphasis on the relation between pickup sensitivities and beam parameters, and a calibration strategy based on Wire Scanner (WS) measurements is presented. Simulations are performed to validate the method prior to experimental implementation. The proposed approach aims to enable non-invasive, continuous monitoring of transverse beam size asymmetries at ESS, providing complementary information to traditional diagnostics.
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