1 Larmor radius and gyration frequency (10 P) Calculate theLarmor radius and the gyration frequency (4 P) for:
1. An electron in the Earth’s ionosphere at 300 km altitude,where the magnetic flux density is B ≈ 0.5 · 10−4 T, consideringthat the electron moves at the thermal velocity (p kT /m) with T =1000 K. (1 P)
2. An oxygen ion O+ in the Earth’s ionosphere for the sameconditions as above. Is there a difference in Larmor radius andgyration frequency between the ion and the electron? Explain. (3P)
3. A 3.5 MeV He++ ash particle in an DT fusion reactor. Use thekinetic energy of the particle to calculate the velocity, assumingthat v|| is negligible.
