Stellarator reactor-relevant fusion exhaust analysis, including diagnostic synthesis from experiments on W7-X
C. C. Klepper, S. De Pascuale, G. Schlisio, J. A. As-sya’bani, B. R. Quinlan, S. Varoutis, J. Ongena, K. Crombé, D. Boeyaert, E. Delabie, F. Federici, C. Killer, B. Lomanowski, T. M. Biewer,The (ITER-prototype) diagnostic residual gas analyzer (p-DRGA) was deployed in the W7-X OP2.3 experimental campaign, with emphasis on W7-X research applications, i.e., going beyond diagnostic capability demonstration focus of the previous campaigns. In addition to an initial validation of neutrals modeling in sub-divertor regions for helium exhaust applications and support of the associate ICRF-induced fast ion generation research program, the diagnostic system also provided early data relevant to an envisioned DRGA-enabled, stellarator reactor-relevant, fusion plasma burn control study, to be extended in OP2.4 and beyond. In this extended study concept, the fast ion generation would serve as proxy to the ICRF-enhanced DT burn approach used in JET-DTE2/DTE3, while the DRGA will provide the relevant species concentrations in real-time. Implicit in this concept is the correlation between core and sub-divertor concentrations, in ∼few sec equilibration time, which still needs validation for the case of stellarators.