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We investigate the collisional Penrose process of extended test particlesnear extremal Kerr black holes using the pole-dipole-quadrupole approximation.We analyze the motion of the test particles and examine the dynamics andmaximum efficiency of energy extraction in this process. Our resultsdemonstrate that the maximum extracted energy in the collisional Penroseprocess is influenced by the spin s and quadrupolar parameter CES2 of the testparticles. Specifically, we observe that, at a fixed collisional position, theenergy extraction efficiency decreases as the spin increases for either thepole-dipole or the pole-dipole-quadrupole approximation case. Furthermore, fora fixed spin, the energy extraction efficiency is higher in thepole-dipole-quadrupole approximation compared to the pole-dipole approximation.These findings provide insight into the role of the internal structures of thetest particles in the collisional Penrose process.

Collisional Penrose process of extended test particles near an extremal Kerr black hole