Patent ID: 8487269
Filing Date: 2013-07-16
Classification: A61N,G01R

Abstract:
1. A passive beam deflection arrangement for deflecting a beam of charged particles in a main magnetic field, comprising: a plurality of dipole deflection units, wherein each of the dipole deflection units generates a dipole magnetic field substantially perpendicular to a path of the beam of charged particles passing through the dipole magnetic field, wherein the beam of charged particles enters a first of the dipole deflection units parallel to an axis of the main magnetic field and is deflected by the deflection units away from the axis, wherein the beam of charged particles leaves a final of the dipole deflection units perpendicular to the main magnetic field, wherein the each of the deflection units comprises eight permanent magnets, wherein six smaller size permanent magnets of the eight permanent magnets are stacked on top of each other in two stacks, wherein each of the two stacks comprises three magnets with an alternating direction of a respective magnetic field of the magnets, and wherein two larger size of the eight permanent magnets are arranged between the two stack.