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J-PARC E16 is an experiment to examine the origin of hadron mass through asystematic measurement of spectral changes of vector mesons in nuclei. Themeasurement of $e^{+}e^{-}$ pairs from the decay of vector mesons will providethe information of the partial restoration of the chiral symmetry in a normalnuclear density. To resolve a pulse pile-up and achieve good discrimination of$e^{\pm}$ from the background of a reaction rate of an order of 10 MHz, thedata acquisition (DAQ) system uses waveform sampling chips of APV25 and DRS4.The trigger rate and data rate are expected to be 1 kHz and 130--330 MiB/s,respectively. The DAQ system for readout of APV25 and DRS4 were developed,where events were synchronized by common trigger and tag data. The firstcommissioning in beam, called Run-0a, was performed in June 2020 with about 1/4of the designed setup. The DAQ worked with a trigger rate of 300 Hz in theRun-0a and the main bottleneck was a large data size of APV25. Furtheroptimization of the DAQ system will improve the performance.

Data acquisition system in Run-0a for the J-PARC E16 experiment