Studies of a scintillator-bar detector for a neutron wall at an external target facility

Abstract

To achieve a better time resolution of a scintillator-bar detector for a neutron wall at the external target facility of HIRFL-CSR, we have carried out a detailed study of the photomultiplier, the wrapping material and the coupling media. The timing properties of a scintillator-bar detector have been studied in detail with cosmic rays using a high and low level signal coincidence. A time resolution of 80 ps has been achieved in the center of the scintillator-bar detector.

Study of the data analysis process of the neutron wall with simulation

“…The values of the second group are similar to the ones obtained from the experiment 16.0 cm/ns and 15.4 cm/ns, respectively, which are taken from Ref. [4]. Therefore, we regard the arriving time of the 43th photon as the time information obtained from the experiment.…”

Studies of timing properties for a TOF counter at an external target facility

“…where σ t l , σ tr are the intrinsic time resolution of the two PMTs of a scintillator counter, t l (t r ) is the measured time by TDC of the scintillator counter from the left (right) PMT, and t av is the particle average crossing time using information from both ends of the tested counter. For each PMT output of the tested counter, the time interval, defined as the arrival time of the time signal from the PMT with respect to the common reference timing provided by S1 and S2 [6] , is recorded and analyzed. It is noted that the variance of the time interval includes the contribution from both the TOF start and stop detectors.…”

A high-precision multi-channel TAC and QAC module for the neutron detection wall

“…The neutron wall detector is a large detector array which is composed of 252 detection units, and the timeof-flight method is used to detect neutrons [2]. The start detector at the front of the neutron wall produces the start signal of the time-of-flight, and the neutron wall detector produces the stop signal of the time-of-flight.…”