| Popis: |
We report current status of the LEPS2 solenoid spectrometer for photoproduction experiments at SPring-8. A large solenoid LEPS2 spectrometer consists of a time projection chamber (TPC), drift chambers, resistive plate chambers and Pb/scintillator sampling calorimeters for photoproduction of hadrons in the energy range from 1.4 to 2.9 GeV. We have developed a new, network-distributed data acquisition system based on DAQ-middleware framework. The DAQ middleware components include gatherers collecting data from detector sub-systems, mergers integrating data from gatherers, and an event builder in the data acquisition software. Over ten thousand pad signals from the TPC are digitized with 40 MS 12-bit flash ADCs and then sent to a TPC gatherer through Space-Wire protocol. During the beam commissioning, Compton-backscattered photon beam was incident on a CH2 target in the energy region from 1.4 GeV to 2.4 GeV. We report on the performance test results of the new DAQ system with beam commissioning of the LEPS2 spectrometer as well. |
