Asset Details
Do you wish to reserve the book?
Energy scaling of energetic particle transport by microturbulence
Hey, we have placed the reservation for you!
By the way, why not check out events that you can attend while you pick your title.
Oops! Something went wrong.
Looks like we were not able to place the reservation. Kindly try again later.
Are you sure you want to remove the book from the shelf?
Energy scaling of energetic particle transport by microturbulence
Do you wish to request the book?
Energy scaling of energetic particle transport by microturbulence
Please be aware that the book you have requested cannot be checked out. If you would like to checkout this book, you can reserve another copy
We have requested the book for you!
Your request is successful and it will be processed during the Library working hours. Please check the status of your request in My Requests.
Oops! Something went wrong.
Looks like we were not able to place your request. Kindly try again later.
Journal Article
Energy scaling of energetic particle transport by microturbulence
2026
Overview
Energetic particle (EP) transport induced by the microturbulence are studied both theoretically and numerically. Based on the quasi-linear theory, the expressions of the four diffusion coefficients describing the EP transport in radial-velocity space (r, v) are derived: the radial diffusion coefficient Drr, velocity diffusion coefficient Dvv, and two cross-terms Drv and Dvr. It is found that Drr scales as E−2 for the deeply trapped particles (TPs), as E−3/2 for the normally passing particles (PPs), and as E−1 for the purely PPs, where E is the EP energy. The normalized D^rv and D^vv scale, respectively, as E−3/2 and E−2 for the purely PPs, and both as E−2 for the deeply TPs. To verify the analytical results, the EP transport induced by the ion temperature gradient turbulence is simulated using GTC. The energy scaling of the simulated diffusion coefficients agrees well with the theoretical predictions. To reveal the underlying physical mechanisms, the finite Larmor radius (FLR) effects, finite orbit width (FOW) effects, and wave-particle resonance condition contributions are investigated separately. The results show that the FLR effects contribute an E−1/2 scaling for the TPs and normally PPs, FOW effects contribute an E−1/2 scaling for both the deeply TPs and PPs, and resonance condition contributes, respectively, an E−1 scaling for the TPs and an E−1/2 scaling for the PPs, consistent with the theoretical analyses. Apart from the energy dependence, the dependence of Drr on the EP pitch is also studied. With the increase of the pitch, the energy scaling is found to exhibit a continuous variation, providing a possible explanation for the discrepancy in previous works on the EP transport energy scaling. Finally, a comparison of the diffusion coefficients magnitudes is made, indicating that Drr dominates the EP transport.
Publisher
IOP Publishing
