Abstract: A charged particle accelerator has an accelerator chamber in the interior of which a narrow beam of charged particles is accelerated. The particle beam is directed to a discharge window for discharging the particles therethrough. A device is provided for wobbling the beam of particles before the particles strike the discharge window, thereby enlarging the area where the particles strike the window. Preferably a magnetic wobbling device may be used. Such a device may have one or more magnetic coils which is/are arranged near the discharge window and which receive(s) a varying electric current. The accelerator may be a linear accelerator generating high energy electrons or X-rays for medical treatment.

Abstract: An ionization chamber for analyzing inhomogeneities in a radiated beam from a particle accelerator system has two measuring chambers formed by three mutually parallel walls spaced apart by spacer rings. Two of the three walls have single electrodes arranged thereon whereas a third wall has several mutually insulated electrodes applied on a measuring chamber side of the wall. The mutually insulated electrodes include a central circular electrode and a group of electrode segments arranged in circular fashion around the central electrode. Inhomogeneities in the radiation intensity of a beam being analyzed are detected by unequal currents in the central electrode relative to surrounding electrode segments or in the electrode segments themselves relative to each other.