Variable strength beam line multipole permanent magnets and methods for their use

Claim 2

An adjustable strength multipole permanent magnet comprising a plurality of axial layers of magnetic material wherein one layer can be angularly displaced with respect to an adjacent layer, each of said axial layers comprising a plurality of segments comprising an oriented, anisotropic permanent magnet material arranged in a ring so that there is a substantially continuous ring of permanent magnet material, each segment having a predetermined easy axis orientation within a plane perpendicular to the axis of the magnet.

Claim 3

The multipole permanent magnet of claim 1 wherein said magnetic material comprises a rare earth cobalt material.

Claim 4

The multipole permanent magnet of claim 2 wherein said rare earth cobalt material is samarium cobalt.

Claim 5

The multipole permanent magnet of claim 1 wherein said magnetic material comprises a ceramic ferrite.

Claim 6

The multipole permanent magnet of claim 1 wherein said magnet is a quadrupole magnet.

Claim 7

The quadrupole magnet of claim 5 having four axial layers.

Claim 8

The quadrupole magnet of claim 5 wherein each axial layer comprises sixteen segments.

Claim 9

The quadrupole magnet of claim 5 wherein each segment is essentially rectangular in cross-sectional shape.

Claim 10

The quadrupole magnet of claim 5 wherein the direction of the easy axis of each segment in each layer is determined by the formula: α=2θ where θ is the angle between the radial symmetry line of a segment and the x-axis and α is the angle between said radial symmetry line and the easy axis of said segment.

Claim 11

The quadrupole magnet of claim 9 further having four axial layers wherein each axial layer comprises sixteen segments and wherein said anisotropic magnetic material comprises a rare-earth cobalt material.

Claim 12

The quadrupole magnet of claim 10 wherein said rare earth cobalt material is samarium cobalt.

Claim 13

The quadrupole magnet of claim 9 further having four axial layers wherein each axial layer comprises sixteen segments and wherein said anisotropic magnetic material comprises a ceramic ferrite.

Claim 14

An adjustable strength multipole permanent magnet assembly comprising a multipole permanent magnet having a plurality of axial layers of magnetic material wherein one layer can be angularly displaced with respect to an adjacent layer and means connected to at least two adjacent axial layers for angularly displacing one layer with respect to the adjacent layer, each of said axial layers comprising a plurality of segments comprising an oriented, anisotropic, permanent magnet material arranged in a ring so that there is a substantially continuous ring of permanent magnet material, each segment having a predetermined easy axis orientation within a plane perpendicular to the axis of the magnet assembly.

Claim 15

An adjustable strength multipole permanent magnet assembly comprising a multipole permanent magnet having a plurality of axial layers of magnetic material wherein one layer can be angularly displaced with respect to an adjacent layer and means connected to at least two adjacent axial layers for angularly displacing one layer with respect to the adjacent layer, each of said axial layers comprising a plurality of segments comprising an oriented, anisotropic, permanent magnet material arranged in a ring so that there is a substantially continuous ring of permanent magnet material, each segment having a predetermined easy axis orientation within a plane perpendicular to the axis of the magnet assembly.

Claim 16

The magnet assembly of claim 13 wherein said material comprises a rare-earth cobalt material.

Claim 17

The magnet assembly of claim 13 wherein said material comprises a ceramic ferrite.

Claim 18

The magnet assembly of claim 13 wherein said adjustable means comprises means for varying the aperture field strength to said magnet in an approximately linear manner.

Claim 19

The magnet assembly of claim 13 wherein said magnet is a quadrupole magnet.

Claim 20

The magnet assembly of claim 17 wherein the direction of the easy axis of each segment in each layer is determined by the formula: α=2θ where θ is the angle between the radial symmetry line of a segment and the x-axis and α is the angle between said radial symmetry line and the easy axis of said segment.

Claim 21

The magnet assembly of claim 17 having four axial layers wherein each axial layer comprises sixteen segments wherein said anisotropic magnetic material comprises a rare-earth cobalt material.

Claim 22

The magnet assembly of claim 19 wherein said adjustment means comprises means for rotatably displacing the two outer layers of the magnet with respect to the two inner layers of the magnet.

Claim 23

An adjustable strength multipole permanent magnet assembly comprising a multipole permanent magnet having a plurality of axial layers of magnetic material wherein one layer can be angularly displaced with respect to an adjacent layer and means connected to at least two adjacent axial layers for angularly displacing one layer with respect to the adjacent layer, each of said axial layers comprising a plurality of segments comprising an oriented, anisotropic, permanent magnet material arranged in a ring so that there is a substantially continuous ring of permanent magnet material, each segment having a predetermined easy axis orientation within a plane perpendicular to the axis of the magnet assembly, said assembly having four axial layers wherein said adjustment means comprises means for rotatably displacing the two outer layers of the magnet with respect to the two inner layers of the magnet and wherein said adjustment means further comprises a rod moveable in a direction perpendicular to the axis of the magnet, a first lever arm connected at one end to the rod and at the other end to one outer axial layer of the magnet, a second lever arm connected at one end to the rod and at the other end to the two inner axial layers of the magnet, and a third lever arm connected at one end to the rod and at the other end to the other outer axial layer of the magnet so that upon inward movement of the rod, the two other axial layers of the magnet are rotatably displaced in one direction and the two inner axial layers of the magnet are displaced angularly in the opposite direction.

Claim 24

An adjustable strength multipole permanent magnet assembly comprising a multipole permanent magnet having a plurality of axial layers of magnetic material wherein one layer can be angularly displaced with respect to an adjacent layer and means connected to at least two adjacent axial layers for angularly displacing one layer with respect to the adjacent layer, each of said axial layers comprising a plurality of segments comprising an oriented, anisotropic, permanent magnet material arranged in a ring so that there is a substantially continuous ring of permanent magnet material, each segment having a predetermined easy axis orientation within a plane perpendicular to the axis of the magnet assembly, said assembly having four axial layers wherein said adjustment means comprises means for rotatably displacing the two outer layers of the magnet with respect to the two inner layers of the magnet and wherein said adjustment means further comprises a rod moveable in a direction perpendicular to the axis of the magnet, a first lever arm connected at one end to the rod and at the other end to one outer axial layer of the magnet, a second lever arm connected at one end to the rod and at the other end to the two inner axial layers of the magnet, and a third lever arm connected at one end to the rod and at the other end to the other outer axial layer of the magnet so that upon inward movement of the rod, the two other axial layers of the magnet are rotatably displaced in one direction and the two inner axial layers of the magnet are displaced angularly in the opposite direction.

Claim 25

The magnet assembly of claim 21 wherein the angular displacement of the outer layers is equal to the angular displacement of the inner layers.

Claim 26

The magnet assembly of claim 21 wherein all of said lever arms are equal in length and said length is equal to the distance from the point of attachment of the arm to the axial layer to the axial center of the quadrupole.

Claim 29

The method according to claim 24 wherein said magnetic material comprises a rare earth cobalt material.

Claim 30

The method according to claim 25 wherein said rare earth cobalt material is samarium cobalt.

Claim 31

The method according to claim 24 wherein said magnetic material comprises a ceramic ferrite.

Claim 32

The method according to claim 24 wherein said magnet is a quadrupole magnet.

Claim 33

The method according to claim 28 wherein said magnet comprises four axial layers.

Claim 34

The method according to claim 28 wherein each axial layer comprises sixteen segments.

Claim 35

The method according to claim 28 wherein each segment is essentially rectangular in cross-sectional shape.

Claim 36

The method according to claim 28 wherein the direction of the easy axis of each segment in each layer is determined by the formula; α=2θ where θ is the angle between the radial symmetry line of a segment and the x-axis and α is the angle between said radial symmetry line and the easy axis of said segment.

Claim 37

The method according to claim 32 wherein each axial layer comprises sixteen segments and wherein said anisotropic magnetic material comprises a rare-earth cobalt material.

Claim 38

The method according to claim 33 wherein said rare-earth cobalt material is samarium cobalt.

Claim 39

The method according to claim 32 wherein said anisotropic magnetic material comprises a ceramic ferrite.

Claim 42

The method in accord with claim 36 wherein said material comprises a rare-earth cobalt material.

Claim 43

The method in accord with claim 36 wherein said material comprises a ceramic ferrite.

Claim 44

The method in accord with claim 36 wherein said adjustable means comprises for varying the aperture field strength of said magnet in an approximately linear manner.

Claim 45

The method in accord with claim 36 wherein said magnet is a quadrupole magnet.

Claim 46

The method in accord with claim 40 wherein the direction of the easy axis of each segment in each layer is determined by the formula; α=2θ where θ is the angle between the radial symmetry line of a segment and the x-axis and α is the angle between said radial symmetry line and the easy axis of said segment.

Claim 47

The method in accord with claim 40 wherein each axial layer comprises sixteen segments wherein said anisotropic magnetic material comprises a rare-earth cobalt material.

Claim 48

The method in accord with claim 42 wherein said adjustment means comprises means for rotatably displacing the two inner layers of the magnet with respect to the two inner layers of the magnet.

Claim 49

The method in accord with claim 43 wherein said adjustment means further comprises a rod moveable in a direction perpendicular to the axis of the magnet, a first lever arm connected at one end to the rod and at the other end to one outer axial layer of the magnet, a second lever arm connected at one end to the rod and at the other end to the two inner axial layers of the magnet, and a third lever arm connected at one end to the rod and at the other end to the other outer axial layer of the magnet so that upon inward movement of the rod, the two other axial layers of the magnet are rotatably displaced in one direction and the two inner axial layers of the magnet are displaced angularly in the opposite direction.

Claim 50

The method in accord with claim 44 wherein the angular displacement of the outer layers is equal to the angular displacement of the inner layers.

Claim 51

The method in accord with claim 44 wherein all of said lever arms are equal in length and said length is equal to the distance from the point of attachment of the arm to the axial layer to the axial center of the quadrupole.