Vortex-driven ultrahigh magnetic field generation in microtube implosion

Microtube implosion is a novel scheme to generate ultrahigh magnetic fields of the megatesla order. These implosions are driven by ultraintense and ultrashort laser pulses. In its original concept, seeded magnetic fields are required to deflect ions and electron flows toward the cylindrical center to generate spin currents and thus ultrahigh magnetic fields. We have recently found that an optimally designed micro-fabrication can enable us to generate ultrahigh magnetic fields in a vortex-driven microtube implosion even without the seeded magnetic fields. Using multi-dimensional particle-in-cell simulations, we clarify the underlying physics of the structured microtube target.