New Testing Setup Advances Magnetohydrodynamic Reentry Braking for Spacecraft

• Researchers at Tokyo Metropolitan University have developed a new test setup for magnetohydrodynamic (MHD) braking, a promising alternative to traditional expendable heat shields for spacecraft reentry.
• MHD braking uses an onboard magnetic field to push against ionized atmospheric plasma, creating an invisible cushion that reduces thermal stress and increases aerodynamic drag.

Technical Innovations

• To overcome the performance limitations of permanent neodymium magnets, researchers utilized a Pulse Forming Network (PFN), which stores and discharges high energy rapidly without requiring cooling systems.
• The team built an 8-meter expansion tube facility, dubbed MX-6.0, capable of generating shockwaves reaching speeds of 7.7 km/s to simulate atmospheric reentry conditions.

Experimental Results

• Testing two 20mm modules, the PFN successfully generated magnetic fields up to 1.58 Tesla—a 50% improvement over the maximum capacity of standard neodymium magnets.
• The setup demonstrated an increase in shock emission region thickness by 15.7% to 16.2%, which directly correlates to enhanced aerodynamic drag and improved braking efficiency.
• This pilot facility provides a robust testing ground for designers to refine MHD braking systems, potentially leading to more efficient, reusable spacecraft designs with greater payload capacities.