A New Method for Measurements of the Poloidal Rotation Velocities and Wavelength Calibration of X-ray Imaging Crystal Spectrometer in Magnetic Fusion Devices*supported by National Natural Science Foundation of China (Nos. 11175208, 11305212 and 11405212), the National Magnetic Confinement Fusion Science Program of China (No. 2013GB112004), and JSPS-NRF-NSFC A3 Foresight Program in the Field of Plasma Physics (No. 11261140328). (April 2015)