29 July 2018 to 4 August 2018
Russian Academy of Sciences
Europe/Moscow timezone

The Large-area Hybrid-optics CLAS12 RICH: Assembling, Commissioning and First Data-taking

30 Jul 2018, 11:50
Blue Hall (Russian Academy of Sciences)

Blue Hall

Russian Academy of Sciences

Leninsky Prospekt, 32а Moscow 119071 Russian Federation
oral presentation [20+5 min] Cherenkov light imaging in particle and nuclear physics experiments Cherenkov light imaging in particle and nuclear physics experiments


marco mirazita (INFN Laboratori Nazionali di Frascati)


The CLAS12 experiment at the upgraded 12 GeV continuous electron beam accelerator facility of Jefferson Lab will offer unique possibilities to study the 3D nucleon structure in the yet poorly explored valence region by deep-inelastic scattering, and to perform precision measurements in hadron spectroscopy.

A large area Ring-Imaging Cherenkov detector has been designed to provide clean hadron identification capability in the momentum range from 3 to 8 GeV/c.
The detector will exploit a novel hybrid-optics configuration, in which the Cherenkov photons will either be detected directly for forward particles or after two mirror reflections for large-angle tracks.
The detector comprises a three squared meters layer of aerogel as photon radiator, made of large-area tiles of cutting edge transmittance at n=1.05, a system of glass-skin planar and composite spherical mirrors of unprecedent lightness and, for the first time, an array of 391 Hamamatsu H8500 and H12700 Multi-Anode Photomultiplier Tubes as photodetectors.
The readout of the 25000 electronic channels is provided by a compact system made by an ASIC front-end card based on the MAROC3 chip configured and controlled by an FPGA card.

The first RICH module was assembled during the second half of 2017 and successfully installed at the beginning of January 2018, in time for the start
of the first CLAS12 experiments with an unpolarized liquid Hydrogen targets. A second RICH sector is in construction for the beginning of the operation of CLAS12 with transversely polarized target.

In the presentation, the quality assurance tests, the assembling operations and the alignment procedures of the components will be reviewed. The RICH commissioning performed with cosmic muons and with the CEBAF electron beam during the CLAS engineering run will be discussed.
The detector performance during the first months of data-taking will be reported.

Primary author

marco mirazita (INFN Laboratori Nazionali di Frascati)


Aram Movsisyan (INFN Sezione di Ferrara) Dario Orecchini (INFN Laboratori Nazionali di Frascati) Fatiha Benmokhtar (Duquesne University, PA, USA) Giovanni Angelini (George Washington University, DC, USA) Ilaria Balossino (INFN Sezione di Ferrara) Justin Goodwill (Duquesne University, PA, USA) Kevin Bailey (Argonne National Laboratory, IL, USA) Kim Andrey (University of Connecticut, CT, USA) Luca Barion (INFN Sezione di Ferrara) Marco Contalbrigo (INFN Ferrara) Matteo Turisini (INFN Sezione di Ferrara) Patrizia Rossi (Thomas Jefferson National Accelerator Facility, VA, USA and INFN Laboratori Nazionali di Frascati) Roberto Malaguti (INFN Sezione di Ferrara) Sandro Tomassini (INFN Laboraori Nazionali di Frascati) Thomas O'Connor (Argonne National Laboratory, IL, USA) Valery Kubarovsky (Thomas Jefferson National Acceleratore Facility, VA, USA) Vincenzo Lucherini (INFN Laboratori Nazionali di Frascati)

Presentation Materials

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