Cooling flow regime of a plasma thermal quench

A large class of Laboratory, Space, and Astrophysical plasmas is nearly collisionless. When a localized energy or particle sink, for example, in the form radiative cooling spot black hole, introduced into such plasma, it can trigger plasma thermal collapse, also known as quench tokamak fusion. Here we show that electron conduction collisionless follows convective transport scaling itself its spatial gradient, due to constraint ambipolar transport. As result, robust flow aggregates mass toward collapse surrounding takes four propagating fronts originate from spot, along magnetic field line magnetized plasma. The slowest one, which responsible deep cooling, shock front.