Speaker
Description
Hollow electron lenses are a promising tool for controlling beam halo at high-intensity colliders like the HL-LHC. In theory, they can efficiently deplete over-populated halos while leaving the core – which travels through a nominally zero-field region – unaffected. However, residual multipolar fields in the electron beam and non-ideal compensations of entry and exit regions of the electron beam can lead to emittance growth and other undesired effects on the circulating-beam core. This is a particular concern for the envisaged operational scenarios with pulsed electron beam currents. In this study, updated two-dimensional field maps from recent measurements at CERN's hollow electron beam test stand are used to quantify these effects under HL-LHC conditions. Beam-dynamics simulations are performed to evaluate the emittance evolution and identify the dominant field components contributing to core degradation. The analysis also considers compensation of the dipolar component using nearby electric kicker magnets.
Funding Agency
Research supported by the HL-LHC project.
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