Key R and D activities for ITER diagnostics

The design of diagnostic systems for ITER requires active R and D in many areas. The International Tokamak Physics Activity Topical Group (TG) on Diagnostics has identified various topics as 'high priority' (HP) and these form the focus of current work. This paper gives an overview of the progress that has been made in the field of diagnostics during the last two years, with emphasis on the various high priority topics (related to alpha particle measurements, neutron tomography, dust and erosion measurements). In addition, the progress that has been achieved in other diagnostic developments for ITER, for example, beam-aided spectroscopy, passive spectroscopy, neutron diagnostics, reflectometry and radiation effects) will be included. (author)