US 12,245,356 B2
Radiotherapy device
Peter Doherty, Crawley (GB); Emma Wooldridge, Crawley (GB); and Ian Shinton, Crawley (GB)
Assigned to Elekta Limited, Crawley (GB)
Appl. No. 17/757,680
Filed by Elekta Limited, Crawley (GB)
PCT Filed Dec. 18, 2020, PCT No. PCT/EP2020/087154
§ 371(c)(1), (2) Date Jun. 17, 2022,
PCT Pub. No. WO2021/123256, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 1918793 (GB), filed on Dec. 19, 2019.
Prior Publication US 2023/0019382 A1, Jan. 19, 2023
Int. Cl. H05H 7/08 (2006.01); H05H 7/04 (2006.01); H05H 7/12 (2006.01); H05H 9/04 (2006.01)
CPC H05H 7/08 (2013.01) [H05H 7/04 (2013.01); H05H 7/12 (2013.01); H05H 9/048 (2013.01); H05H 2007/043 (2013.01); H05H 2007/084 (2013.01); H05H 2007/122 (2013.01); H05H 2277/113 (2013.01)] 19 Claims
OG exemplary drawing
 
5. A method for use in a particle accelerator, the method comprising:
producing a beam of electrons from a source of electrons;
inputting the beam of electrons into an input acceleration cell of a waveguide;
applying an RF field to the waveguide to create an oscillating electric field along a central axis of the waveguide to accelerate the beam of electrons along the central axis;
trapping electrons that have deviated from the beam of electrons using a magnet arrangement, wherein the magnet arrangement is configured to redirect one or more electrons that have deviated from the beam of electrons by approximately 180 degrees back towards the beam of electrons; and
turning off the magnet arrangement to allow trapped electrons to join the beam of electrons.
 
13. A radiotherapy device comprising:
a particle accelerator, the particle accelerator including:
a waveguide comprising a series of acceleration cells, wherein the series of acceleration cells comprises an input acceleration cell, configured to accelerate a beam of electrons along a central axis of the series of acceleration cells;
a source of electrons configured to input the beam of electrons into the input acceleration cell; and
a magnet arrangement configured to prevent one or more electrons that have deviated from the beam of electrons from colliding with the source of electrons and configured to redirect the one or more electrons that have deviated from the beam of electrons by approximately 180 degrees back towards the beam of electrons.