公开(公告)号：US06778633B1

公开(公告)日：2004-08-17

申请号：US09937609

申请日：2002-01-28

申请人： Neil Loxley ,  Mark Taylor ,  John Leonard Wall ,  Graham Vincent Fraser

发明人： Neil Loxley ,  Mark Taylor ,  John Leonard Wall ,  Graham Vincent Fraser

IPC分类号： H05G152

CPC分类号： H05G1/36 ,  H01J35/14 ,  H01J35/30

摘要： An X-ray generator comprises an evacuated and sealed X-ray tube, containing an electron gun and an X-ray target. An electron beam is produced by the electron gun in which the cathode is at negative high voltage, the electron gun consisting of a filament just inside the aperture of a Wehnelt grid which is biased negatively with respect to the filament. Two sets of beam deflection coils, are employed in two planes, mounted between the anode of the electron gun and the focussing lens to center the beam. Between the focussing lens and the target is an air-cored quadripole magnet which acts as a stigmator in that it turns the circular cross-section of the beam into an elongated one. This quadripole can be rotated about the tube axis so as to adjust the orientation of the line focus. The beam can be moved about on the target surface by controlling the currents in the four coils of the quadripole.

摘要翻译： X射线发生器包括一个包含电子枪和X射线靶的真空密封的X射线管。 由电子枪产生电子束，其中阴极处于负高电压，电子枪由位于Wehnelt网格的孔内的细丝构成，其相对于灯丝负偏置。 两组光束偏转线圈用于安装在电子枪的阳极和聚焦透镜之间的两个平面中，以使光束居中。 在聚焦透镜和目标物之间的是一个空心四极磁铁，其作为一个标示器，因为它将光束的圆形横截面转变成一个细长的。 该四极杆可以围绕管轴线旋转，以便调节线焦点的取向。 通过控制四极线圈的四个线圈中的电流，光束可以在目标表面上移动。