Abstract
The UA9 setup, installed in the Super Proton Synchrotron (SPS) at CERN, was exploited for a proof of principle of the double-crystal scenario, proposed to measure the electric and the magnetic moments of short-lived baryons in a high-energy hadron collider, such as the Large Hadron Collider (LHC). Linear and angular actuators were used to position the crystals and establish the required beam configuration. Timepix detectors and high-sensitivity Beam Loss Monitors were exploited to observe the deflected beams. Linear and angular scans allowed exploring the particle interactions with the two crystals and recording their efficiency. The measured values of the beam trajectories, profiles and of the channeling efficiency agree with the results of a Monte-Carlo simulation.
Highlights
Planar channeling in bent crystals is a powerful tool often exploited for beam manipulations in particle accelerators [1]
Accurate methods to orient the crystals and record useful data were applied, making use of high-quality crystals, linear and angular actuators, Timepix sensors housed inside Roman Pots and high-sensitivity Beam Loss Monitor (BLM) located outside of the vacuum pipe
The optimal crystal orientation was not precisely reached during the high-statistics data-taking run, essentially because of the motor controller instabilities introducing an undesired sliding of the angular actuator
Summary
Planar channeling in bent crystals is a powerful tool often exploited for beam manipulations in particle accelerators [1]. The second crystal should have a larger deflection angle in order to induce a large enough rotation of the polarization vector for an accurate detection of the magnetic dipole moment, as discussed in [20,21,22,23,24,25]. Investigating such a sophisticated beam manipulation at lower beam energy in a circular accelerator with warm iron magnets is the best way to assess its feasibility and evaluate its performance in safer conditions than in a superconducting collider. Operational aspects of the upgraded layout and recent results from the data collected for the first time in a circular accelerator are reported hereafter, together with their comparison with computer simulations
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