| Institution: | 1. Stellarator Heating and Optimisation Division, Max-Planck-Institute for Plasma Physics, Greifswald, Germany;2. National Institute for Fusion Science, National Institutes of Natural Sciences, Toki, Japan
The Department of Fusion Science, SOKENDAI (The Graduate University for Advanced Studies), Toki, Japan;3. Department of Applied Physics, Aalto University, Espoo, Finland;4. P-24 Plasma Physics Group, Los Alamos National Laboratory, Los Alamos, New Mexico, USA |
| Abstract: | Fast ion confinement is of major importance for the ignition of a burning fusion plasma. In future deuterium plasma campaigns of the Wendelstein 7-X stellarator, W7-X, the amount of triton burn-up is one possible measure for fast ion confinement. A well-established technique to observe triton burn-up is the 14 MeV neutron rate. In this paper, it is estimated whether an existing scintillating fibre neutron detector is also suited to measure triton burn-up in W7-X with sufficient accuracy. An estimation is presented, which can be applied to any tokamak or stellarator design and is one-dimensional in the minor radius. The inputs are profiles of density, temperature, and differential volume element as well as the triton slowing-down time. The estimation calculates the thermal deuteron fusion rate and the associated deuteron-triton fusion rate; thus, the triton burn-up generated 14 MeV neutron rate. It neither takes triton diffusion nor explicit losses into account. This thermally generated fusion rate is compared to the neutral beam injection heating induced beam-plasma fusion rate. |
