2D tomography of SXR data from toroidally separated cameras for studies of impurity injection and fast instabilities on JET

摘要

1. Introduction Spatially resolved soft X-ray (SXR) measurements will represent an important tool for monitoring impurity profiles in JET plasmas with an all-metal ITER-like first wall. Line-integrated profile measurements will be provided by pinhole cameras in three poloidal sections, see fig. 1: camera V at octafit 2 and camera T at octant 7 (both with vertical view, 35 channels, 250 urn Be filters and new diodes installed in 2011), and the radiation protected camera S4 at octant 4 (horizontal view, 16 channels, 350 urn Be filter, ~15° tilt from the poloidal plane). The diagnostic is capable of high temporal resolution (up to 200 kHz), to implement it systematically, a new data acquisition system is being finalised. In this contribution, the potential of the diagnostic for reconstruction of 2D SXR emissivity is investigated.