Fuel retention and carbon deposition on beryllium marker tiles from JET tokamak main chamber limiters investigated by ion beam analysis

Nuclear Fushion

article

P. Tsavalas¹  A. Lagoyannis¹  K. Mergia¹  M. Axiotis¹  S. Harissopulos¹  G. Provatas³  S. Fazinić³  T. Tadić³  A. Widdowson⁴  M. Rubel⁵ 

[1] National Centre for Scientific Research ‘Demokritos’;Department of Physics, Zografou Campus, National Technical University of Athens;Ruđer Bošković Institute;United Kingdom Atomic Energy Authority, Culham Science Centre;KTH Royal Institute of Technology

关键词: JET tokamak;    beryllium;    deuterium retention;    ion beam analysis;    carbondeposition;   

DOI  :  10.1088/1741-4326/ac9cf0

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

The JET tokamak with the ITER-like wall is operated with arrays of castellated beryllium (Be) limiters in the main chamber. In several locations Be marker tiles were installed for erosion-deposition studies. The castellation sides and the plasma-facing surfaces (PFSs) of Be marker tiles from three different locations of the JET main chamber, from the experimental campaigns 2011–12 (ILW-1) and 2013–14 (ILW-2), were analysed, employing ²H and ³He micro-beams in order to determine carbon (C) impurity deposition and deuterium (D) retention. The deposited C and D amounts on the castellation sides (up to 1.5 mm deep into the groove) were assessed with respect to the ion/electron drift direction. Both the C and D amounts on the investigated castellation sides either stay constant or reduce with depth from the edge of the PFS. No systematic difference is observed in the C deposition or D retention on the different castellation sides of each sample with respect to the ion/electron drift direction. C and D content is found to be lower on the PFS than on surfaces in the gaps of castellation for the majority of the samples. The C amount is, in general, higher than the D one. No systematic correlation between the C and the D amounts has been observed.

【 授权许可】

Unknown