Atomic Energy of Canada Limited

Atomic Energy of Canada Limited / Energie Atomique Du Canada Limitee

Joseph McKeown

Norbert H Drewell

Stuart T Craig

Victor A Mason

Jean-Pierre Labrie

James Ungrin

Bryan F White

Court B Lawrence

Courtlandt B Lawrence

Stanley O Schriber

Marshall R Cleland

Walter Garfield Davies

John S Fraser

An apparatus for delivering a beam of charged particles along two separate beam paths comprising a pulsed charged particle beam source for producing a series of beam pulses along a first beam path, a switching magnet for developing a magnetic field, and a power supply means for selectively applying current pulses to said switching magnet in timed relation to each of a plurality of predetermined beam pulses effective to develop a constant magnetic field throughout the period of each predetermined beam pulse and deflect each entire predetermined beam pulse from said first beam path to a second beam path.

Simultaneous double sided irradiation

Absorbed dose in a product being irradiated by an electron beam is determined by measuring the collectable current in a beam stop and correlating the current to absorbed dose.

Method for monitoring absorbed dose in an electron beam

An electron linear accelerator for use in industrial material processing, comprises an elongated, resonant, electron accelerator structure defining a linear electron flow path and having an electron injection end and an electron exit end, an electron gun at the injection end for producing and delivering one or more streams of electrons to the electron injection end of the structure during pulses of predetermined length and of predetermined repetition rate, the structure being comprised of a plurality of axially coupled resonant microwave cavities operating in the .pi./2 mode and including a graded-.beta. capture section at the injection end of the structure for receiving and accelerating electrons in the one or more streams of electrons, a .beta.=1 section exit section at the end of the structure remote from the capture section for discharging accelerated streams of electrons from the structure and an rf coupling section intermediate the capture section and the exit section for coupling rf energy into the structure, an rf system including an rf source for converting electrical power to rf power and a transmission conduit for delivering rf power to the coupling section of the structure, a scan magnet disposed at the exit end of the structure for receiving the electron beam and scanning the beam over a predetermined product area and a controller for controlling the scanning magnet and synchronously energizing the electron gun and the rf source during the pulses.

Electron beam current measuring device

An electron linear accelerator for use in industrial material processing, comprises an elongated, resonant, electron accelerator structure defining a linear electron flow path and having an electron injection end and an electron exit end, an electron gun at the injection end for producing and delivering one or more streams of electrons to the electron injection end of the structure during pulses of predetermined length and of predetermined repetition rate, the structure being comprised of a plurality of axially coupled resonant microwave cavities operating in the .pi./2 mode and including a graded-.beta. capture section at the injection end of the structure for receiving and accelerating electrons in the one or more streams of electrons, .beta.=1 section exit section at the end of the structure remote from the capture section for discharging accelerated streams of electrons from the structure and an rf coupling section intermediate the capture section and the exit section for coupling rf energy into the structure, an rf system including an rf source for converting electrical power to rf power and a transmission conduit for delivering rf power to the coupling section of the structure, a scan magnet disposed at the exit end of the structure for receiving the electron beam and scanning the beam over a predetermined product area and a controller for controlling the scanning magnet and synchronously energizing the electron gun and the rf source during the pulses.

Industrial material processing electron linear accelerator

A charged particle beam deflector having a bimodal resonant cavity through which a charged particle beam is passed along the cavity axis. The cavity is excited in a first mode by applying a first rf signal to the cavity through a first magnetic feed loop on the side of the cavity, and in a second mode orthogonal to the first mode by applying a second rf signal to the cavity through a second magnetic feed loop located on the side of the cavity at a circumferential angle of approximately 90.degree. from the first feed loop. The first mode deflects the beam along a first diametric axis passing through the cavity axis and the first loop location and the second mode deflects the beam along a second diametric axis which is substantially perpendicular to the first diametric axis. The rf signals to the feed loops are normally of identical frequency but may differ in ampitude and in phase from one another or from the beam to provide various controlled scan patterns.

Charged particle beam deflector

A charged particle beam position monitor having a resonant cavity which is excited in a first mode if the monitored beam passing through it is displaced along the x-axis, and is excited in a second mode orthogonal to the first if the monitored beam passing through it is displaced along the y-axis. These modes are tuned to the same frequency and may be independently detected. The X and Y coordinates of the beam are determined by the amplitude and phase of the detected first and second orthogonal modes respectively.

Growing community of inventors

Kanata, Canada

Joseph McKeown