  In Chinese Spallation Neutron Source (CSNS), proton beam is used to hit metal
tungsten target, and then high flux neutron are generated for experiments on
instruments. For neutron flux spectrum correction, the current of proton beam
is for each instrument.
  A real time monitor system is developed in CSNS, to monitor, broadcast and
record each pulse of proton. Each proton pulse charge is measured and marked
with high-precision timestamp. Then, the result of measurement will be
broadcasted to control room and each neutron instrument. In control room, the
proton charge of each pulse is listened and stored in database by agent program
for offline use. The high-precision timestamp can be used to proton charge and
neutron data alignment in time scale. The architecture of proton beam monitor
system is introduced in this paper. And the performance of this system is
evaluated in this paper.
