[Halld-pid-upgrade] [EXTERNAL] Abstract for INSTR2020 Conference

[Wenliang Li]

Dear  Collaborators,

Please see below for the abstract for the INSTR2020 conference in 
Russia. Please let me know if you have some suggestions or comments.

Many thanks

Bill

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GlueX DIRC at JLab

The GlueX experiment at Jefferson Laboratory aims to perform 
quantitative tests of non-perturbative QCD by measuring the hadronic 
spectroscopy (mainly consisting of light-quark mesons and baryons). The 
recently installed Directional Internal Reflection Cherenkov (DIRC) 
detector is a great enhancement to the particle identification (PID) 
package of GlueX, and is designed to extend clean pi/K separation up to 
4 GeV/c momenta in the forward region (theta<11 deg from the beam). This 
will significantly enrich the scientific program of GlueX by allowing a 
clean detection of hybrid mesons decaying into kaon final states at 
higher momenta. The DIRC system is constructed using long quartz 
radiators from decommissioned BaBar experiment combined with new compact 
photon sensors based on SuperB FDIRC concept. This system was fully 
installed in Oct 2019, and commissioned with beam during 4 weeks in Dec 
2019. In this presentation we will be discussing the construction and 
commissioning of the DIRC system, as well as the detector performance in 
comparison to the expectation.

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