  The LHCb RICH system provides hadron identification over a wide momentum
range (2-100 GeV/c). This detector system is key to LHCb's precision flavour
physics programme, which has unique sensitivity to physics beyond the standard
model. This paper reports on the performance of the LHCb RICH in Run II,
following significant changes in the detector and operating conditions. The
changes include the refurbishment of significant number of photon detectors,
assembled using new vacuum technologies, and the removal of the aerogel
radiator. The start of Run II of the LHC saw the beam energy increase to 6.5
TeV per beam and a new trigger strategy for LHCb with full online detector
calibration. The RICH information has also been made available for all trigger
streams in the High Level Trigger for the first time.
