Siemens Aktiengesellschaft

Andreas Jahnke

Helmut Marsing

Konrad Meier

Wolfgang Rossner

Juergen Leppert

Christa Grabmaier

Richard Matz

Hermann Boedinger

Wolfgang Schubert

Frank Anton

Ralf-Dieter Schnell

Eric Chemisky

Eberhard Bayer, Deceased

An x-ray generator has a beam guidance system including an air coil and a toroidal solenoid coil, a ring anode surrounding the patient to be examined and arranged axially offset relative to the beam guidance, and individually driveable electron-optical components couple the electrons, which orbit on a circular specified path in the magnetic dipole field of the air coil, out of that path, deflect them in the axial direction, and focus them onto a segment of the ring anode allocated to the respectively activated out-coupling element.

X-ray generator

A directly converting radiation detector with a diode structure having first and second operating electrodes on opposite sides of a semiconductor body has an additional injector electrode, which injects charge carriers for the compensating charged traps in the semiconductor body. The secondary dark current generated in this way does not flow via the electrode used for measurement purposes and therefore does not influence the measured signal. The injection is facilitated by suitable doping under the injector electrode.

Fast operating radiation detector and method for operating same

A phosphor for a high energy radiation detector is formed by a rare earth oxisulfide having the general sum formula (M.sub.1-x Ln.sub.x).sub.2 O.sub.2 S, wherein M is at least one element of the group Y, La and Gd, Ln stands for at least one element of the group Eu, Ce, Pr, Tb, Yb, Dy, Sm and Ho, and whereby (2.times.10.sup.-1).gtoreq..times..gtoreq.(1.times.10.sup.-6), which also contains molybdenum in a proportion between 10.sup.-1 and 10.sup.-6 mol percent for reducing the afterglow of the phosphor.

Phosphor having reduced afterglow and method for manufacturing same

An x-ray detector element suitable for use in computer tomography has a semi-insulating semiconductor body composed of a compound semiconductor, and is operated with a constant voltage source so that it functions as an x-ray-sensitive photoconductor. A measurement instrument is connected across the voltage source for detecting the photocurrent, which is indicative of the x-rays incident on the semiconductor body.

X-ray detector with direct conversion

A synchrotron radiation source includes a beam guidance system for accelerating and storing an electron or positron particle beam on a closed trajectory. In order to generate the synchrotron radiation, the beam guidance system has at least one approximately achromatic mirror magnet being formed of superconducting winding configurations and in which the trajectory is bent through approximately 270.degree.. Further components of the beam guidance system, such as deflecting magnets and focusing magnets do not necessarily need to be constructed from superconducting components. The synchrotron radiation source permits the utilization of all of the advantages of superconductors with the most extensive avoidance of the disadvantages associated therewith, since the application of superconducting components can be restricted to the components specifically constructed for the generation of the synchrotron radiation.

Synchrotron radiation source

A synchrotron radiation source contains a particle track with a curved track section. A beam guiding chamber surrounding the particle track has an exit opening for the synchrotron radiation leading in an outward direction. A magnetic device has superconducting coil windings located on both sides of the particle track having a peripheral outer rim. In addition, a device for the mechanical fixation of the superconducting coil windings is provided. The fixation device has at least one support element at the peripheral outer rim of the magnetic device. The support element is located further outward than the exit opening for the synchrotron radiation and acts substantially perpendicular to the direction of the radiation. The support element is covered from the synchrotron radiation by a radiation absorber. The use of a support element provides simple and safe support for the superconducting coil windings in the area of the radiation exit opening.

Synchrotron radiation source having adjustable fixed curved coil windings

A magnetic device is arranged in a curved section of the path of electrically charged particles of an acceleration installation around a beam guiding chamber. The magnetic device contains curved coil windings built up of superconducting rectangular conductors, which have convex outsides, concave insides as well as transition regions at the coil ends between these sides. The superconducting coil windings (4a) according to the invention are arranged at least with their winding parts (57, 58) forming the convex outsides (53) and concave insides (54) in grooves of correspondingly formed coil formers of the magnetic device, with the grooves extending downward at least approximately perpendicular to the plane (x-y plane) determined by the particle path. In addition, the superconducting coil windings (4a') in the region of their coil ends (55') are bent up saddle-shaped. With these measures the effect of undesirable conductor motions on the exactitude of the magnetic fields generated by the coil windings can at least largely be excluded.

Magnetic device with curved superconducting coil windings

A magnetic field apparatus for a particle accelerator having a particle track having curved sections contains several magnetic field-generating windings, and at least one supplemental winding provided for focusing the electrically charged particles. The system does not require pre-accelerators and relatively large particle streams should be capable of being accelerated nevertheless to relatively high energy levels. In the region of at least one of the curved sections of the particle track, an azimuthal guiding field for the particles is generated by the supplemental winding during the acceleration phase. This supplemental winding is designed as an appropriately curved electric conductor arrangement which in part encloses the particle track and which is designed in the manner of a hollow channel open toward the outside. The conductor arrangement is appropriately structured for suppressing eddy currents and carries a current transversely to the particle track.

Magnetic field apparatus for a particle accelerator having a

Magnetic field-generating apparatus for an installation for accelerating electrically charged particles, the particle track of which comprises curved and straight sections, contains main magnetic field generating windings and at least one supplemental winding which is provided for focusing the particles on the particle track. It should be possible to accelerate relatively large particle streams to relatively high energy levels without the need for separate preaccelerators. In the region of at least one of the curved sections of the particle track the supplemental winding is designed as a conductor arrangement forming a quadrupole triplet for focusing the particles during their acceleration phase, the turns of the supplemental winding being arranged on both sides of the plane in which the particle track lies. In particular, a conductor arrangement forming a quadrupole triplet can be provided in both regions of the curved sections of the particle track wherein these conductor arrangements together form a double-telescope system for focusing the particles.

Apparatus generating a magnetic field for a particle accelerator

A magnetic thin-film head with layer-wise build-up on a nonmagnetic substrate for a recording medium which can be magnetized vertically, comprises a ring head-like conduction body for carrying magnetic flux having two magnet legs, of which the end pole pieces facing the recording medium have, respectively, a predetermined small width transverse to the direction of motion and change into widening leg parts a space being provided between the two magnet legs through which the turns of a write/read coil winding extend. A magnetic head having highly efficient write and read functions is thereby obtained. The vertical length (gap height h) of one of the two end pole pieces is relatively small, while the corresponding length (l) of the other end pole piece is several times the former, and a widening leg part of the magnet leg with the comparatively shorter vertical end pole piece is provided with a recess which extends along its center line lying in the conduction direction of the magnetic flux and extends at least approximately to the shorter end pole piece.

Magnetic thin-film head for a recording medium that can be magnetized

A method for manufacturing a disc-shaped curved magnet coil, particularly for a system for accelerating and/or storing electrically charged particles such as electrons. The conductors of the coil to be made are to be arranged around a winding core having a convex outside and a concave inside and are then to be fixed in position around the winding core. A coil form or fitting piece of predetermined shape is first added to a winding core, so that a provisional winding body with only positive radii of curvature on its outsides is formed. The conductors are wound under tension around the winding body and subsequently are fastened only to the winding core of the winding body and, after the coil form is removed, the thus exposed conductor portions facing the region of the concave inside of the winding core are pressed against this inside and fixed in position.

Apparatus for manufacturing a disc-shaped curved magnet coil

A magnetic field device for a system for acceleration and/or storage of electrically charged particles, particularly electrons, comprises curved sections in the particle trajectory, in which an accordingly curved dipole magnet is arranged, which contains superconducting windings and a supplemental winding and with which a magnetic guidance field for the particle beam can be generated which has a weakly focusing effect due to corresponding field gradients. It should be possible to bring about these field gradients in a relatively simple manner also for a high magnetic flux density. Accordingly, it is provided for this purpose that with each dipole magnet which is at least free of iron, a superconducting supplemental winding is associated which is curved accordingly, adjoins at least with its convex outside the region of the concave inside of the curved dipole windings, and with which the necessary field gradients can be brought about in substance.

Growing community of inventors

Forchheim, Germany

Andreas Jahnke