  The Time-Of-Propagation (TOP) counter is a novel device for particle
identification for the barrel region of the Belle II experiment, where,
information of Cherenkov light propagation time is used to reconstruct its ring
image. We successfully finished the detector production and installation to the
Belle II structure in 2016. Commissioning of the installed detector has been on
going, where the detector operation in the 1.5-T magnetic field was studied.
Although we found a problem where photomultipliers were mechanically moved due
to the magnetic force, it was immediately fixed. Performance was evaluated with
cosmic ray data, the number of photon hits were confirmed to be consistent with
simulation within 15-30%.
