text: 136,94,1326361594603970560,1192861416535085056,Libby Tolman,"My latest paper is out on arXiv: <LINK>. In it, Peter Catto and I develop a new analytic method for calculating alpha particle heat fluxes in a tokamak that has small perturbations in its electric and magnetic fields. <LINK> Our work suggests that alpha particle transport in SPARC (one tokamak being designed) due to the TAE (one type of perturbation to the tokamak fields) might be small. It will be interesting to see if other methods for predicting such transport agree with this result. <LINK> The paper's math is heavy, so I'll be explaining it with lots of pictures and diagrams during a Friday #apsdpp talk (session ZI02). <LINK>",https://arxiv.org/abs/2011.04920,"Upcoming tokamak experiments fueled with deuterium and tritium are expected to have large alpha particle populations. Such experiments motivate new attention to the theory of alpha particle confinement and transport. A key topic is the interaction of alphas with perturbations to the tokamak fields, including those from ripple and magnetohydrodynamic modes like Alfv\'{e}n eigenmodes. These perturbations can transport alphas, leading to changed localization of alpha heating, loss of alpha power, and damage to device walls. Alpha interaction with these perturbations is often studied with single particle theory. In contrast, we derive a drift kinetic theory to calculate the alpha heat flux resulting from arbitrary perturbation frequency and periodicity (provided these can be studied drift kinetically). Novel features of the theory include the retention of a large effective collision frequency resulting from the resonant alpha collisional boundary layer, correlated interactions over many poloidal transits, and finite orbit effects. Heat fluxes are considered for the example cases of ripple and the toroidal Alfv\'{e}n eigenmode (TAE). The ripple heat flux is small. The TAE heat flux is significant and scales with the square of the perturbation amplitude, allowing the derivation of constraints on mode amplitude for avoidance of significant alpha depletion. A simple saturation condition suggests that TAEs in one upcoming experiment will not cause significant alpha transport via the mechanisms in this theory. However, saturation above the level suggested by the simple condition, but within numerical and experimental experience, which could be accompanied by the onset of stochasticity, could cause significant transport. ",Drift kinetic theory of alpha transport by tokamak perturbations,3,"['My latest paper is out on arXiv: <LINK>.  In it, Peter Catto and I develop a new analytic method for calculating alpha particle heat fluxes in a tokamak that has small perturbations in its electric and magnetic fields. <LINK>', 'Our work suggests that alpha particle transport in SPARC (one tokamak being designed) due to the TAE (one type of perturbation to the tokamak fields) might be small.  It will be interesting to see if other methods for predicting such transport agree with this result. https://t.co/KSySypfeFQ', ""The paper's math is heavy, so I'll be explaining it with lots of pictures and diagrams during a Friday #apsdpp talk (session ZI02). https://t.co/DZtFKl48RH""]",20,11,637