BESⅢ ETOF upgrade readout electronics commissioning

It is proposed to upgrade the endcap time-of-flight (ETOF) of the Beijing Spectrometer Ⅲ(BESⅢ) with a multi-gap resistive plate chamber (MRPC), aiming at an overall time resolution of about 80 ps. After completing the entire readout electronics system, some experiments, such as heat radiation, radiation hardness and large-current beam tests, have been carried out to confirm the reliability and stability of the readout electronics. An on-detector test of the readout electronics has also been performed with the beam at the BEPCⅡ E3 line. The test results indicate that the readout electronics system fulfills its design requirements. (authors)