Abstract
A possible Dark Matter model postulates that it interacts with Standard Model particles only through a massive photon-like vector particle, called dark photon or A′. The PADME experiment at the DAΦNE Beam-Test Facility (BTF) in Frascati is designed to detect dark photons produced in positron on fixed target annihilations decaying to dark matter (e+e-→γA′) by measuring the final state missing mass. The DAQ system of the PADME experiment will handle a total of 921 channels, with a DAQ rate of 50 Hz. All channels will be acquired using the CAEN V1742 board, a 32 channels 5 GS/s digitizer based on the DRS4 chip. Two such boards were successfully used during the 2015 and 2016 tests at the BTF, where a complete DAQ system, prototypal to the one which will be used for the final experiment, was set up. In this paper we will report on the details of the DAQ system, with specific reference to our experience with the V1742 board.
Highlights
The long standing problem of reconciling the cosmological evidence of the existence of dark matter with the lack of any clear experimental observation of it, has recently revived the idea that the interaction of the new particles with the Standard Model (SM) gauge fields is not direct but occurs through “portals”, connecting our world with new “secluded” or “hidden” sectors
PADME experiment at the DAΦNE Beam-Test Facility (BTF) in Frascati is designed to detect dark photons produced in positron on fixed target annihilations decaying to dark matter
This paper describes the DAQ system that will be used for the PADME experiment, with special attention to the DRS4 characteristics, and reports on the first results obtained with a DAQ system prototype used during several testbeams at the BTF in 2015 and 2016
Summary
The long standing problem of reconciling the cosmological evidence of the existence of dark matter with the lack of any clear experimental observation of it, has recently revived the idea that the interaction of the new particles with the Standard Model (SM) gauge fields is not direct but occurs through “portals”, connecting our world with new “secluded” or “hidden” sectors. Aim of the experiment is to detect the non-SM process e+e-→γA', with A' undetected, by measuring the final state missing mass, using a 550 MeV positron beam from the improved Beam-Test Facility (BTF) of the DAΦNE Linac at the INFN Frascati National Laboratories [5]. The collaboration will complete the design and construction of the experiment by the end of 2017 and will collect O(1013) positrons on target in two years starting in 2018, with the goal of reaching a ε~10-3 sensitivity for dark photon masses up to a maximum of MA' ~ 24 MeV/c2, limited by the available c.o.m. energy. Published under licence by IOP Publishing Ltd veto detectors immersed in the field of a 0.5 Tesla dipole magnet to detect positrons losing their energy due to Bremsstrahlung radiation; and a calorimeter made of BGO crystals, to measure/veto final state photons. This paper describes the DAQ system that will be used for the PADME experiment, with special attention to the DRS4 characteristics, and reports on the first results obtained with a DAQ system prototype used during several testbeams at the BTF in 2015 and 2016
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