! Linearized DK/GK Improved Sugamam Collision operator between species a and b
!
! !! TODO(Sam): Corriger ces annotations
! Note: as defined below, the Sugama operator differs from a 2 factor from the original paper due to the definition of the isothermal part of the linearized Coulomb
!
! Ref: Sugama et. al., Phsyics of Plasmas 26 (2019)