Speaker
Description
The ALICE fixed-target (ALICE-FT) programme uses crystal-assisted halo splitting to send a controlled flux of beam-halo particles onto an internal target upstream of the ALICE interaction point, enabling a rich fixed-target physics programme in parallel to collider running. We present the final feasibility assessment for operation with HL-LHC Pb beams.
Using SixTrack–FLUKA tracking with particle–matter interactions, we scan optics, crystal parameters and target/absorber geometry. The phase advance between the IR7 collimation system and the ALICE-FT crystal, as well as the crystal bending angle and alignment, are optimised to maximise halo interception and channeling to the target while preserving the collimation hierarchy. The optimised layout increases the fraction of halo particles on target, delivers fixed-target luminosities compatible with the projected ALICE heavy-ion programme and keeps additional losses within machine-protection limits. We conclude with an operational scenario and prospects for an experimental demonstration of the concept.
Funding Agency
This research was funded by the National Science Centre, Poland, project number: 2021/43/D/ST2/02761
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