A mini-sun is inside

Inside a 3-meter-wide plasma containment chamber — the “Big Red Ball” — the team placed a cylindrical permanent magnet about 10 centimeters wide and 10 centimeters long. This was their starter sun. They then filled the ball with a plasma made from helium gas and drove an electrical current through it, which created a force on the plasma that made it spin around the dipole.

more at Quanta

NASA has a nice page about the Parker Solar Probe, mentioned in the article. The probe tweets!