wiggler
/ˈwɪglə(r)/noun
1- a person or thing that wiggles or causes something to wiggle（使）扭动（或摆动）的人（或物）。
1.1
- Physics a magnet designed to make a beam of particles in an accelerator follow a sinusoidal path, in order to increase the amount of radiation they produce【物理】正弦式轨迹激励磁铁。