The CLAS12 Micromegas Vertex Tracker

Abstract

The Micromegas Vertex Tracker was designed to improve upon the tracking capabilities of the baseline design of the CLAS12 spectrometer in Hall B at Jefferson Laboratory. A Barrel Micromegas Tracker made with six concentric cylinders, each made of three 120 • -sector tiles, surrounds the Silicon Vertex Tracker, and a Forward Micromegas Tracker composed of 6 disks is placed 30 cm downstream of the liquid-hydrogen target. Both trackers sit in a 5 T solenoid magnetic field. All Micromegas elements are based on resistive technology to withstand luminosities up to 10 35 cm −2 s −1 , as well as on bulk technology to enforce gain uniformity and mechanical robustness. Due to the high magnetic field, dedicated electronics have been designed and displaced ∼2 m away from the detectors. The electronics readout is based on the DREAM ASICs that allow sustained operation up to 20 kHz trigger rate at the maximum luminosity.

Trends in particle and nuclei identification techniques in nuclear physics experiments

“…The precise determination of the scattered electron angle is obtained with a tracker complementing the FT-Cal and FT-Hodo detectors. The FT-Trk uses the same technology adopted by the CLAS12 central and forward Micromegas tracker [266]; it consists of two double-layer detectors and is located in front of the FT-Hodo with geometry chosen to enable the determination of the (x, y) coordinates (perpendicular to the beam z-axis) of a track.…”

Current Status and Future Developments of Micromegas Detectors for Physics and Applications

“…The very forward region, between 2°and 5°, is equipped with a calorimeter based system to detect electrons and photons. Micromegas are used close to the target to improve on the baseline tracking systems [40] and in the very forward region to provide the pointing direction of the scattered electron [41].…”

Medica-Plus: a Micromegas-based proof-of-concept detector for sub-becquerel tritium activity assessment at the service of oncological research

“…The detector has been coupled with DREAM electronics [7], allowing for independent strip reading. The maximum gain measured with a 55 Fe source is ∼17000 [6].…”