公开(公告)号：US3402310A

公开(公告)日：1968-09-17

申请号：US50824265

申请日：1965-11-17

Applicant: ATOMIC ENERGY AUTHORITY UK

Inventor： ALBERT HOWE FREDERICK ,  INCH BELL RONALD

IPC: H01J5/06 ,  H05H5/00 ,  H05H5/02

CPC classification number: H05H5/02 ,  H01J5/06 ,  H05H5/00

Abstract: 1,116,442. Particle accelerators. UNITED KINGDOM ATOMIC ENERGY AUTHORITY 16 Nov., 1965 [19 Nov., 1965], No. 47260/64. Heading H1D. In a D.C. particle accelerator at least one " quartet" of axially localized transverse magnetic fields is provided along the acceleration tube to deflect the beam successively away from the axis of the tube, parallel to the axis, towards the axis and then along the axis again or, in practice, along a path parallel to, but slightly displaced from the axis, as shown. Spurious electrons are, however, deflected into the electrodes and the electron loading is thus reduced. The magnetic fields may be set up by one or more pairs of permanent magnets or by annular permanent magnets incorporated in selected electrodes, i.e. mounted in the dished portions of selected electrodes with coverplates provided to shield the magnets from the electric fields. At the input end of the acceleration tube electrodes with circumferentially corrugated apertures may be used to provide non-axial electric fields. Alternatively electrodes with non-corrugated circular apertures progressively decreasing in diameter may be used. In an arrangement with pairs of permanent magnets the apertures of the electrodes have enlarged end portions to aid evacuation and successive electrodes are rotated, in certain regions where the magnetic fields are closely spaced by 90 degrees, to provide optical baffling. In a second arrangement with annular magnets Fig. 7 (not shown), relatively large apertures are used to increase pumping speed. Electrodes dished in either direction relative to the beam may be used. In the arrangement shown, certain of the electrodes may be flat with a transitional degree of dishing of the electrodes on either side in order to avoid any reduction in the number of electrodes along the acceleration tube due to the incorporation of the magnets. A progressive dishing of the electrodes adjacent those carrying the magnets may also be used in the second arrangement, Fig. 7 (not shown). In the arrangement shown, successive " quartets " divert the beam to opposite sides of the tube axis. In the second arrangement, Fig. 7 (not shown), the beam is always diverted to the same side. The accelerator may be for accelerating ions or electrons.

公开(公告)号：US3342404A

公开(公告)日：1967-09-19

申请号：US50742665

申请日：1965-11-12

Applicant: ATOMIC ENERGY AUTHORITY UK

Inventor： ALBERT HOWE FREDERICK ,  INCH BELL RONALD

IPC: H01J5/06 ,  H01J41/18

CPC classification number: H01J41/18 ,  H01J5/06

Abstract: 1,087,725. Particle accelerators. UNITED KINGDOM ATOMIC ENERGY AUTHORITY. Nov. 11, 1965 [Nov. 19, 1964], No. 47158/64. Heading H1D. A differential pumping tube arranged in parallel with a D.C. particle accelerator tube and having potential distributing annular electrodes 1 along its length has each electrode comprising a diametral bar 4a, 4b bent out of the plane of the electrode, all the bars being bent towards one end of the tube. An electric field having a component towards the axis of the tube is thereby set up between pairs of adjacent electrodes in order to suppress electron loading. The bars may be bent to V- or arcuate shape and successive bars may be circumferentially displaced through a small angle. Also the inner periphery of each electrode may be bent from the plane of the electrode.