A higher momentum aperture lattice proposed for the sPHENIX background problem
Year: 2026
Type: conference-paper
Abstract: During the 2024 Au+Au 100 GeV physics run, the sPHENIX MVTX detector experienced background issues originating from the Yellow beam, leading to frequent auto-recoveries during streaming mode operation. One hypothesis attributes the background to the loss of off-momentum particles. An evaluation of the momentum apertures in both RHIC rings revealed that the Yellow ring had a worse momentum acceptance compared to the Blue ring. To address this, a new lattice design with a reduced W-function was proposed. This report presents the momentum aperture comparison between the two rings, the proposed new lattice design considering additional constraints, and the resulting momentum and dynamic apertures.
Source: JACOW
Authors: Liu,Chuyu, Robert-Demolaize,Guillaume, Drees,Kirsten, Gu,Xiaofeng, Luo,Yun
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7126111465
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