Accelerators – Separated Sector Cyclotron (SSC)

  • The SSC is a variable energy machine, which was designed to produce protons of maximum beam energy 200 MeV
  • The magnet system of the SSC comprises four identical C-shape sector magnets. Each of these four sector magnets has a sector angle of 34◦ .
  • This compromise angle was chosen mainly to avoid serious resonances in the betatron oscillations during acceleration resulting in beam loss.
  • Each of the sector magnets has three sets of coils, giving it a maximum flux density of 1.265 T in the 66 mm pole gap.
  • The main field is provided by a single coil layer around the pole tips which provides a flux density of 1.15 T.
  • Additional coils are wound around the yoke to correct for difference in steel properties between sector magnets.
  • To preserve isochronism over the radial distance, the flux density must increase by 20% if protons are to be accelerated to 200 MeV. To accomplish this, a set of 29 trim coils is used.
  • • The RF system of the SSC, consists of two λ/2-resonators with a delta shaped accelerating electrode.
  • The resonators are each capacitively coupled to a 150 kW power amplifier.
  • The resonator can be tuned over the resonance frequency range 6 to 26 MHz.