The Assembly of the Belle II TOP Counter
Boqun Wang (for the Belle II PID Group)
TL;DR
This paper details the design, assembly, and testing procedures of the innovative TOP counter for particle identification at the Belle II experiment, emphasizing optical component quality and alignment techniques.
Contribution
It introduces the assembly process for the novel TOP counter, including acceptance testing and optical component integration, for the first time in this context.
Findings
Successful assembly of 16 modules around the beam line
Acceptance testing ensures high optical quality of components
Alignment and gluing procedures optimize detector performance
Abstract
A new type of ring-imaging Cherenkov counter, called TOP counter, has been developed for particle identification at the Belle II experiment to run at the SuperKEKB accelerator in KEK, Japan. The detector consists of 16 identical modules arranged azimuthally around the beam line. The assembly procedure for a TOP module is described. This procedure includes acceptance testing of the quartz mirror, prism, and quartz bar radiators. The acceptance tests include a chip search and measurements of bulk transmittance and total internal reflectance. The process for aligning and gluing the optical components together is described.
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