A polarization rotator is provided for rotating the polarization direction of linearly polarized light by any arbitrary angle other than 90\xb0. The hyper-polarized gas is used as a tracer gas. A turbine receives the pressurized natural gas and induces a pressure drop in the gas as the gas induces mechanical rotation of the turbine. With the downward movement of a beam, the two parts dock through their docking surfaces, while the weight of sucker rods forces the rotator to move down using rollers in spiral slots rotating the polished rod along with the sucker rods until the beam’s movement is complete. In response, the first processor changes the state of the cache line in accordance with the cache coherency protocol and reads the data written by the second processor. After formation of the stress layers, sidewall spacers of the gate stacks of PMOS and NMOS devices are removed so as to release stress in the channel regions.