17 citations · 24 across the 18 of their papers we have counts for
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Divergence Without Transition in Adiabatic Theory: Exact Cancellation in Reflectionless Potentials
Amitava Bhattacharjee
Adiabatic invariants play a central role in plasma physics, from magnetic moment and bounce action to wave action in slowly varying media. Their perturbative constructions are ofte…
Optical analogy for stellarators: Ridges as caustics and coils as singularities
Wrick Sengupta, Stefan Buller, Rogerio Jorge +7
A common feature of most numerically optimized stellarator geometries is the presence of sharp ridges on outer flux surfaces, irrespective of the rotational transform. Despite thei…
Anderson Localization of Ion-Temperature-Gradient Modes in Aperiodic Stellarators
Amitava Bhattacharjee
The geometric coefficients of the ion-temperature-gradient (ITG) eigenmode equation along a magnetic field line are aperiodic because the line samples the full three-dimensional ge…
Wave interference as the origin of the cyclic magnetorotational dynamo in accretion disks: insights from weakly nonlinear theory and local shearing box simulations
Uddipan Banik, Amitava Bhattacharjee, James M. Stone
Long-period cyclic reversals of the large-scale magnetic field are a prominent feature of the dynamo associated with the magnetorotational instability (MRI) in accretion disks, but…
System Size Dependence of Collisionless Reconnection Rate
Yi-Min Huang, Naoki Bessho, Li-Jen Chen +2
It is a widely accepted paradigm that collisionless magnetic reconnection proceeds at a universal fast rate of when normalized to a properly defined reconnecting magnetic…
Forced Reconnection in Voigt-Regularized MHD
Andrew Brown, Yi-Min Huang, Amitava Bhattacharjee
Forced reconnection in Voigt-regularized MHD is investigated in the Hahm-Kulsrud-Taylor problem. It is shown that Voigt regularization introduces an early linear phase of reconnect…
Topological Arrest of Ballooning Modes in Non-Axisymmetric Plasmas
Amitava Bhattacharjee
Why do non-axisymmetric stellarators avoid ballooning crashes that afflict tokamaks? Three-dimensional geometry induces Anderson localization of ballooning modes, converting a glob…
Non-thermal particle acceleration in multi-species kinetic plasmas: universal power-law distribution functions and temperature inversion in the solar corona
Uddipan Banik, Amitava Bhattacharjee
Non-thermal power-law distribution functions are ubiquitous in astrophysical, space, and laboratory kinetic plasmas, but their origin remains unclear. A related puzzle is the tempe…