A magnetic lens typically consists of several electromagnets arranged in a quadrupole ( see quadrupole magnet ), sextupole, or higher format; the electromagnetic coils are placed at the vertices of a square or another regular polygon.
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Each period of the Chasman Green lattice contains a focusing quadrupole magnet symmetrically located between a pair of identical dipole magnets, which transports incident electrons through a bending arc to an exit path that is independent of the electron energy.
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Some keep the beams on their circular path ( see image ), while an additional are used to keep the beams focused, with stronger quadrupole magnets close to the intersection points in order to maximize the chances of interaction where the two beams cross.
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The quadrupole magnets used to focus and combine the beam have the unfortunate property that their focusing strength ( describable by a focal length ) is dependent on the energy of the particle being focused high energy particles having longer focal lengths than those with lower energy.
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"' Quadrupole magnets "', abbreviated as "'Q-magnets "', consist of groups of four magnets laid out so that in the planar multipole expansion of the field, the dipole terms cancel and where the lowest significant terms in the field equations are quadrupole.
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1957 to 1960-Kalmus conducted research at UCL mainly on the development of new instruments, helping to build a small particle accelerator, a 29 MeV electron microtron, its beam extraction system, and its external focusing using quadrupole magnets ( probably the first use of these in the UK ), and later devising an accurate method of measuring relativistic electron beam energies using Cerenkov radiation, then a novel technique.
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