Abstract
The CLAS12 spectrometer at JLab will offer unique possibilities to study the 3D nucleon structure in terms of TMDs and GPDs in the poorly explored valence region, and to perform high precision hadron spectroscopy. A large area ring-imaging Cherenkov detector has been designed to achieve the required hadron identification capability in the momentum range 3-8 GeV/c. The detector, based on a novel hybrid imaging design, foresees an aerogel radiator and an array of multi-anode photomultipliers. The detector concept and preliminary results of test-beams on a prototype are presented.
Highlights
The CLAS12 spectrometer at JLab will offer unique possibilities to study the 3D nucleon structure in terms of TMDs and GPDs in the poorly explored valence region, and to perform high precision hadron spectroscopy
The Jefferson Lab main facility is currently undergoing a major upgrade program which will lead to a doubled energy of the electron beam, an increased luminosity, the construction of a new experimental hall (Hall D) and the enhancement of the detector systems in the existing halls
EPJ Web of Conferences detectors, and a mirror system (Fig. 1). The latter is essential to reduce the area covered by the photon detectors, minimizing costs and the material-budget impact on the detectors positioned behind (TOF and Calorimeters)
Summary
The Jefferson Lab main facility is currently undergoing a major upgrade program which will lead to a doubled energy of the electron beam (from 6 GeV to 12 GeV), an increased luminosity, the construction of a new experimental hall (Hall D) and the enhancement of the detector systems in the existing halls. The large acceptance CLAS12 spectrometer, located in Hall B, will benefit from highly polarized electron beams of energies up to 11 GeV It will be operated at luminosities as high as 1035 cm−2 s−1, providing unique conditions for the study of electron-nucleon scattering in this kinematic regime [1]. The CLAS12 baseline includes already some PID detectors: a time-of-flight system (TOF), able to identify hadrons with momenta up to 3 GeV/c, and two Cherenkov gas detectors of high (HTCC) and low (LTCC) threshold. The latter two reach the required pion rejection factor only at the edge of the available phase space (hadron momenta above 7 GeV/c) and are not able to distinguish kaons from protons. The RICH will substitute the LTCC in at least two of the six radial sectors of the CLAS12 spectrometer
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