Electron Density Measurement by Raman Calibration of the HuanLiuqi-2A Thomson Scattering System

抄録

Thomson scattering system is absolutely calibrated by anti-Stokes rotational Raman scattering from nitrogen gas filled in HuanLiuqi-2A (commonly referred to as HL-2A) chamber. Since the intensity of strayed laser light from the lower and upper divertor throats is very strong, additional transimission-type short pass filters are directly piled up on each interference filter to block the laser wavelength. The obtained data of electron density show good reliability, and they are in time trace coincident with the measured results of HCN laser interferometer. The uncertainties of measured results and the improving methods of the system are discussed.