HCN Laser Interferometer on the EAST Superconducting Tokamak

摘要

A single-channel far-infrared(FIR)laser interferometer was developed to measurethe line averaged electron density on the EAST tokamak.The structure of the single-channelFIR laser interferometer is described in detail.The evolution of density sawtooth oscillation wasmeasured by means the FIR laser interferometer,and was identified by electron cyclotron emission(ECE)signals and soft X-ray intensity.The discharges with and without sawtooth were comparedwith each other in the Hugill diagram.