NHC_PERIOD

NHC_NCHAINS = [real]
Default: NHC_NCHAINS = 40 

The only parameter of the Nose-Hoover chains thermostat NHC_thermostat is the time scale ($\tau$) of the system. This parameter, expressed in terms of the number of MD steps, is defined using the flag NHC_PERIOD. The value of NHC_PERIOD should correspond to a characteristic time scale in the system. If the latter is not available, NHC_PERIOD should be set to a value between 20 and 200.