Impurity measurements in plasma boundary of JIPP T-II tokamak/stellarator.

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Abstract
Impurity transport in the scrape-off layer of the JIPP T-H Tokamak/Stellarator hybrid torus machine in Institute of Plasma Physics, Nagoya University has been investigated by a probe measurement. Silicon and Cu probes were inserted into the boundary plasma during discharges. The surface of the probes was analyzed by several analytical techniques including AES, XPS, RBS and PIXE. Main metallic impurities deposited on the probes were Mo and Fe which originated from the limiters and the inner wall of the vacuum chamber. Depth concentration profile of deposited impurities was measured by AES along with sputter-etching of the surface with Ar ions. Deposited Fe impurity had the maximum concentration at the top surface of the probe, while the depth profile of Mo showed the maximum concentration at around 8 A from the top surface. Transportation energy of these impurities are discussed on the basis of the projected range data.

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