A magnetic apparatus includes a first conductive feature. The first conductive feature conducts a current. The first conductive feature directs an electron having an energy ranging from 50 to 250 MeV in response to a magnetic field generated by the current. The first conductive feature includes a first leg and a second leg. The first leg is integrated with the second leg. The second leg and the first leg define a first space, wherein the electron penetrates the first space and is redirected in the first space.