The particle confinement time of boron, τ B, is studied in the TPE-1RM20 reversed field pinch plasma by means of a laser ablation technique. The experimental conditions were as follows: pinch parameter, Θ, and plasma current, I p, are scanned, and τ B obtained from a zero dimensional approximation is compared with the energy confinement time, τ E. The results show that τ B increases almost linearly with TE, and the implication of this is discussed in terms of energy loss channels. The increase of τ B with Θ supports the recently obtained improved confinement at high Θ. Laser ablation results are compared with the particle confinement time of deuterium, τ p, from the D α line spectrum measurement. It is shown that τ B ≈ τ P, which indicates a weak mass dependence in particle transport. Numerical simulation is also conducted and compared on a one dimensional basis with the experimentally obtained spatial distribution of the line emission intensity of the boron impurity injected by the laser ablation. The result shows reasonable agreement with experiment.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Condensed Matter Physics
- Nuclear and High Energy Physics
Yagi, Y., Baig, T. J., Carraro, L., Hirano, Y., Hamada, R., Maejima, Y., ... Shimada, T. (1997). Particle confinement in a reversed field pinch plasma. Nuclear Fusion, 37(12), 1775 - 1792. https://doi.org/10.1088/0029-5515/37/12/I09