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Experimental asymmetries in fusion implosions can lead to magnetic fieldgeneration in the hot plasma core. For typical parameters, previous studiesfound that the magnetisation Hall parameter, given by the product of theelectron gyro-frequency and Coulomb collision time, can exceed one. This willaffect the hydrodynamics through inhibition and deflection of the electron heatflux. The magnetic field source is the collisionless Biermann term, whicharises from the Debye shielding potential in electron pressure gradients. Weshow that there is an additional source term due to the Z dependence of theCoulomb collision operator. If there are ion composition gradients, such asjets of carbon ablator mix entering the hot-spot, this source term can rapidlyexceed the Biermann fields. In addition, the Biermann fields are enhanced dueto the increased temperature gradients from carbon radiative cooling. With evenstronger self-generated fields, heat loss to the carbon regions will bereduced, potentially reducing the negative effect of carbon mix.

philosophical transactions - royal society. mathematical, physical and engineering sciences/philosophical transactions - royal society. mathematical, physical and engineering sciences

Magnetic field generation from composition gradients in inertial confinement fusion fuel