This refrigeration system is an orifice-tube system constituting a refrigeration cycle in which a refrigerant passes through a compressor 1, a condenser 10, an orifice-tube 3, an evaporator 4, and an accumulator 5 in this order and then returns to the compressor 1. A top coupler is positionable around a top of a beverage container. The percentages of the first chalcogenide and the second chalcogenide in the AR coating are selected to provide a refractive index of the AR coating that approximates the square root of a refractive index of the substrate. In addition, a turbine wheel rotor, that includes a steel shaft, a cast wheel including a casting alloy fixedly connected to an end of the shaft. The T-type calcium channel inhibitors according to the present invention are useful as a treating agent of diseases associated with over-expression of the T-type calcium channel.