Patent ID: 8729508

Claim:
A beam transport system for a hadron therapy facility with at least two patient treatment stations, comprising: a main beam transport line into which a hadron beam is injected; a secondary beam transport line branching off from said main beam transport line for delivering said hadron beam into one of said patient treatment stations; a switching electromagnet for deviating said hadron beam from said main beam transport line into said secondary beam transport line, said switching electromagnet comprising an electromagnet coil; an energising circuit associated with said electromagnet coil for energising the latter so as to produce a hadron beam deviation from said main beam transport line into said secondary beam transport line; and a discharge circuit capable of dissipating the electromagnetic energy stored in the switching electromagnet, when the energization of said electromagnet coil is interrupted; wherein said discharge circuit comprises a discharge accelerating circuit capable of generating a voltage opposing the counter electromotive force induced in the electromagnet coil when the energization of said electromagnet coil producing said hadron beam deviation is interrupted, wherein said voltage stays substantially constant or increases as the current induced in the electromagnet coil decreases.