Transverse field bitter-type magnet
View Patent ↗A new type of coil magnet in which the plane of each turn of the conducting coil is rotated with respect to the central axis. This results in the induced magnetic field being oriented off the central axis. A set of two such disk assemblies are preferably nested, with the current flowing in opposite directions within the two assemblies. This results in the components of the two induced magnetic fields lying along the center axis canceling each other out, leaving only a purely transverse magnetic field. In addition, variations in the angular offset of the nested coils can be used to create a magnetic field having almost any orientation. Three or more such nested disk assemblies can be employed to strengthen and adjust the transverse magnetic field.
1. An electromagnet capable of creating an angularly displaced magnetic field, comprising:
a. a center axis running from a first end of said electromagnet to a second end of said electromagnet;
b. a central cavity, lying within said electromagnet and running along said center axis;
c. a helical conductor, wrapped around said central cavity, wherein said helical conductor is formed by a plurality of 360 degree turns;
d. wherein each of said plurality of turns lies approximately in one of a plurality of offset parallel planes; and
e. wherein a normal vector for each of said plurality of offset parallel planes is angularly displaced from said center axis.
2. An electromagnet capable of creating an angularly displaced magnetic field, comprising:
a. a first coil, including
i. a first center axis running from a first end of said first coil to a second end of said first coil;
ii. a central cavity, lying within said first coil and running along said first center axis;
iii. a first helical conductor, wrapped around said central cavity, wherein said first helical conductor is formed by a plurality of 360 degree turns;
iv. wherein each of said plurality of turns lies approximately in one of a first plurality of offset parallel planes;
v. wherein a normal vector for each of said first plurality of offset parallel planes is angularly displaced from said first center axis;
b. a second coil, including
i. a second center axis running from a first end of said second coil to a second end of said second coil, wherein said second center axis is aligned with said first center axis;
ii. a second helical conductor, wrapped around said first coil, wherein said second helical conductor is formed by a plurality of 360 degree turns;
iii. wherein each of said plurality of turns lies approximately in one of a second plurality of offset parallel planes;
iv. wherein a normal vector for each of said second plurality of offset parallel planes is angularly displaced from said first center axis;
c. wherein an electrical current is caused to flow in a first direction within said first coil; and
d. wherein an electrical current is caused to flow in a direction opposite to said first direction within said second coil.
3. An electromagnet as recited in claim 2 , further comprising:
a. a third coil, including
i. a third center axis running from a first end of said third coil to a second end of said third coil, wherein said third center axis is aligned with said first center axis;
ii. a third helical conductor, wrapped around said second coil, wherein said third helical conductor is formed by a plurality of 360 degree turns;
iii. wherein each of said plurality of turns lies approximately in one of a third plurality of offset parallel planes;
iv. wherein a normal vector for each of said third plurality of offset parallel planes is angularly displaced from said first center axis; and
b. wherein an electrical current is caused to flow in said third coil in the same direction as said electrical current flowing within said first coil.
4. An electromagnet as recited in claim 3 , further comprising:
a. a fourth coil, including
i. a fourth center axis running from a first end of said fourth coil to a second end of said fourth coil, wherein said fourth center axis is aligned with said first center axis;
ii. a fourth helical conductor, wrapped around said third coil, wherein said fourth helical conductor is formed by a plurality of 360 degree turns;
iii. wherein each of said plurality of turns lies approximately in one of a fourth plurality of offset parallel planes;
iv. wherein a normal vector for each of said fourth plurality of offset parallel planes is angularly displaced from said first center axis; and
b. wherein an electrical current is caused to flow in said fourth coil in the same direction as said electrical current flowing within said second coil.
5. An electromagnet as recited in claim 2 , wherein the size of said first and second coils and the magnitudes of said electrical currents flowing in said first and second coils are configured so that said angularly displaced magnetic field created within said central cavity is a transverse magnetic field.
6. An electromagnet as recited in claim 3 , wherein the size of said first, second, and third coils and the magnitudes of said electrical currents flowing in said first, second, and third coils are configured so that said angularly displaced magnetic field created within said central cavity is a transverse magnetic field.
7. An electromagnet as recited in claim 4 , wherein the size of said first, second, third, and fourth coils and the magnitudes of said electrical currents flowing in said first, second, third, and fourth coils are configured so that said angularly displaced magnetic field created within said central cavity is a transverse magnetic field.
8. An electromagnet capable of creating an angularly displaced magnetic field, comprising:
a. a first coil, including
i. a first center axis running from a first end of said first coil to a second end of said first coil;
ii. a central cavity, lying within said first coil and running along said center axis;
iii. a first helical conductor, wrapped around said central cavity, wherein said helical conductor is formed by a plurality of 360 degree turns;
iv. wherein each of said plurality of turns lies approximately in one of a first plurality of offset parallel planes;
v. wherein a normal vector for each of said first plurality of offset parallel planes is angularly displaced from said first center axis;
b. a second coil, including
i. a second center axis running from a first end of said second coil to a second end of said second coil, wherein said second center axis is aligned with said first center axis;
ii. a second helical conductor, wrapped around said first coil, wherein said second helical conductor is formed by a plurality of 360 degree turns;
iii. wherein each of said plurality of turns lies approximately in one of a second plurality of offset parallel planes;
iv. wherein a normal vector for each of said second plurality of offset parallel planes is angularly displaced from said first center axis; and
c. control means capable of causing an electrical current to flow in an arbitrary first direction within said first coil and capable of causing an electrical current to flow in an arbitrary second direction within said second coil, so that said angularly displaced magnetic field within said central cavity can be oriented in an arbitrary direction.
9. An electromagnet as recited in claim 8 , wherein said control means is further capable of arbitrarily adjusting the magnitude of said electrical current within said first coil and the magnitude of said electrical current within said second coil, so that the strength of said magnetic field within said central cavity can be adjusted.
10. An electromagnet as recited in claim 8 , further comprising:
a. a third coil, including
i. a third center axis running from a first end of said third coil to a second end of said third coil, wherein said third center axis is aligned with said first center axis;
ii. a third helical conductor, wrapped around said second coil, wherein said third helical conductor is formed by a plurality of 360 degree turns;
iii. wherein each of said plurality of turns lies approximately in one of a third plurality of offset parallel planes;
iv. wherein a normal vector for each of said third plurality of offset parallel planes is angularly displaced from said first center axis; and
b. wherein said control means is further capable of causing an electrical current to flow in an arbitrary third direction within said third coil, so that said angularly displaced magnetic field within said central cavity can be oriented in an arbitrary direction.
11. An electromagnet as recited in claim 10 , wherein said control means is further capable of arbitrarily adjusting the magnitude of said electrical current within said third coil, so that the strength of said magnetic field within said central cavity can be adjusted.
12. An electromagnet as recited in claim 10 , further comprising:
a. a fourth coil, including
i. a fourth center axis running from a first end of said fourth coil to a second end of said fourth coil, wherein said fourth center axis is aligned with said first center axis;
ii. a fourth helical conductor, wrapped around said third coil, wherein said fourth helical conductor is formed by a plurality of 360 degree turns;
iii. wherein each of said plurality of turns lies approximately in one of a fourth plurality of offset parallel planes;
iv. wherein a normal vector for each of said plurality of offset parallel planes is angularly displaced from said first center axis; and
b. wherein said control means is further capable of causing an electrical current to flow in an arbitrary fourth direction within said fourth coil, so that said angularly displaced magnetic field within said central cavity can be oriented in an arbitrary direction.
13. An electromagnet as recited in claim 12 , wherein said control means is further capable of arbitrarily adjusting the magnitude of said electrical current within said fourth coil, so that the strength of said magnetic field within said central cavity can be adjusted.