Which are genuine limitations of a conventional fixed-frequency cyclotron?

Select all that apply

• Option A

  Neutral particles cannot be accelerated by the electric gap field in the required way.

• Option B

  At relativistic speeds the cyclotron frequency changes because the relativistic momentum relation changes.

• Option C

  Electrons become relativistic at comparatively modest energies, causing loss of synchronism.

• Option D

  A cyclotron can accelerate every neutral atom if B is made sufficiently large.