DEUTERIUM RETENTION IN N-SEEDED AND UNSEEDED TUNGSTEN LAYERS OBTAINED WITH DCMS AND M-HIPIMS TECHNIQUE

The retention of hydrogen isotopes in tungsten co-deposited layers is a subject severely understudied the literature compared to isotope implantation bulk specimens. However, impurity seeding future next-generation fusion devices can reduce sputtering threshold and potentially increase contribution global tritium problem. This paper reports on development fusion-relevant tungsten-deuterium nitrogen-seeded deuterium using direct current (DCMS) multipulse high-power impulse magnetron techniques (HiPIMS). four resulting from co-deposition argon-deuterium argon-deuterium-nitrogen atmosphere were investigated release point view. Supplementary crystalline structure all samples particularly composition also studied. produced m-HiPIMS technology showed higher coherence deposited with DCMS part owned enhanced ion bombardment forming during deposition. On other hand, without exception formation tungsten-nitride compound. Here contrary as revealed by X-ray diffraction measurements measurement that nitride favored for m-HiPIMS. elemental areal densities layer constituents analyzed Rutherford Backscattering Spectrometry. In this case, only two revealing nitrogen content factor ~2 retained HiPIMS.The was case it shown despite deposition method behavior occurs predominantly at temperatures above 800 K suggesting high energy trapping layers. Nitrogen influences both mechanisms increases orders magnitude seeded unseeded ones.