see: "4x and 3x Interference for Stringy Bose Einstein Black Hole production."
4x X-Ray laser interference or 3x E.M. interference should lead to Bose Einstein knots or (Fenmtosecond) unstable nano Black Holes.
However a combination of both (X ray and EM) interference could become more stable black holes as observed as Sprites and Elves above lightning clouds producing Ball lightning or even micro Comets.
See also: https://www.futurity.org/x-ray-laser-black-hole-1450352-2/
Energetic X-ray pulses from Linac Coherent Light Source (LCLS) X-ray free-electron laser at the Department of Energy’s SLAC National Accelerator Laboratory.
also called: toroidal orientifold