Status of Thomson scattering diagnostic design for ITER X-point and divertor plasmas

For a few years now the Thomson scattering diagnostic design for ITER X-point vicinity is constantly developing and improving. The beneficial use of LIDAR technique is the basis for the design guidelines. The penetration and safety severe constraints force to compromise a number of features like the lower density limit and viewing chord length. Nevertheless, the compromised electron density 10(19) m(-3) and viewing chord length of no less than Im basically accommodate the target measurement specifications. The conventional Thomson scattering coupled to LIDAR diagnostic arrangement is considered as well to penetrate a divertor leg. It makes the provisions to T-e,n(e) profile recording along the vertical chord with pretty good spatial resolution of 1cm within the anticipated range of plasma parameters. The background and details of the design are reviewed in the paper.