DOE OSTI · 1607856
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$^\circ$-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 $\sim$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.
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Acker, A., Attié, D., Aune, S., Ball, J., Baron, P., Bertrand, Q., Besin, D., Bey, T., Bossù, F., Boudouin, R., Boyer, M., Christiaens, G., Contrepois, P., Defurne, M., Delagnes, E., Garçon, M., Georges, F., Giraud, J., Granelli, R., Grouas, N., Lahonde-Hamdoun, C., Lerch, T., Mandjavidze, I., Meunier, O., Moudden, Y., Procureur, S., Riallot, M., Sabatié, F., Vandenbroucke, M., Virique, E.. 2020-01-17. The CLAS12 Micromegas Vertex Tracker. https://doi.org/10.1016/j.nima.2020.163423
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