Particle therapy gantry with an energy degrader and an achromatic final bending system

A movable gantry for delivery of a particle beam using beam scanning technique, the movable gantry comprising:

• an inlet section for an accelerated particle beam and having a plurality of quadrupole magnets;
• a first bending section having a plurality of dipole and quadrupole magnets for beam correction;
• a transfer section having a plurality of said quadrupole magnets for the beam correction and a degrader;
• a last beam bending section having a plurality of separate and/or combined dipole/quadrupole/higher order multipole magnets forming an achromatic section, wherein all said magnets of said achromatic section disposed downstream of said degrader, any dispersion in said achromatic section being suppressed so that the dispersion will have a momentum acceptance of more than ±5%;
• a scanning section having two separate or one combined fast deflection magnets that deflect the particle beam at an iso-center in a direction perpendicular to a beam direction to perform lateral scanning;
• and
• a beam nozzle section having a beam nozzle.