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1. US20130285661 - Spin detector arrangement for measuring the vector component of a spin vector predominating in a particle beam

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Claims

1. Spin detector arrangement for detecting vector components of a predominant spin vector in a particle beam having a predominant spin orientation of the particles, with the spin detector arrangement comprising:
a spin rotator having a switchable coil, with the switchable coil having an axial direction and being aligned such that the particle beam passes through the switchable coil along the axial direction;
a deflection device connected downstream of the spin rotator, which deflects the path of the particle beam electrostatically by a deflection angle;
a spin detector connected downstream of the deflection device, which allows the detection of the perpendicular vector components of the predominant spin vector in the particle beam relative to the direction of motion of the particle beam; and
a switching unit connected to the switchable coil, which allows the switching of the excitation state of the coil,
wherein the spin detector is configured to successively measure two respective vector components of the predominating spin vector and the switching unit is configured to switch the coil of the spin rotator into a first excitation state in the one measurement, and into a second excitation state in the other measurement.
2. Spin detector arrangement in accordance with claim 1, wherein the spin rotator comprises an electrostatic lens that is enclosed by the switchable coil.
3. Spin detector arrangement in accordance with claim 1, wherein the deflection device connected downstream of the spin rotator is a deflection device that causes an electrostatic deflection.
4. Spin detector arrangement in accordance with claim 1, wherein the deflection device connected downstream of the spin rotator is a deflection device that deflects the path of the particle beam electrostatically by 90°.
5. Spin detector arrangement in accordance with claim 1, wherein the current strength and/or the sign of the current flowing through the switchable coil can be adjusted by means of the switching unit.
6. Spin detector arrangement in accordance with claim 1, wherein a yoke encloses the switchable coil of the spin rotator.
7. Spin detector arrangement in accordance with claim 6, wherein the detector is a Mott detector.
8. Spin detector arrangement in accordance with claim 1, wherein the detector is a detector that simultaneously detects two vector components perpendicularly to one another.
9. Method for detecting all vector components of a predominating spin vector in a particle beam using a spin detector arrangement for detecting vector components of a predominant spin vector in a particle beam having a predominant spin orientation of the particles, with the spin detector arrangement comprising:
a spin rotator having a switchable coil, with the switchable coil having an axial direction and being aligned such that the particle beam passes through the switchable coil along the axial direction;
a deflection device connected downstream of the spin rotator, which deflects the path of the particle beam electrostatically by a deflection angle;
a spin detector connected downstream of the deflection device, which allows the detection of the perpendicular vector components of the predominant spin vector in the particle beam relative to the direction of motion of the particle beam; and
a switching unit connected to the switchable coil, which allows the switching of the excitation state of the coil,
wherein the spin detector successively measures two respective vector components of the predominating spin vector, with the coil of the spin rotator being switched by means of the switching unit into a first excitation state in the one measurement, and into a second excitation state in the other measurement.
10. Method in accordance with claim 9, wherein the first and the second excitation state of the coil are different with respect of the current strength and/or the sign of a current flowing through the coil.
11. Method in accordance with claim 10, wherein a current with a specific current strength flows through the coil in the first excitation state, and a current of the same current strength as in the first excitation state, but with a reversed sign compared to the first excitation state, flows through said coil in the second excitation state.
12. Method in accordance with claim 10, wherein in the first excitation state, a current of a specific current strength flows through the coil at an amount greater than Zero, and in the second excitation state, no current flows through said coil.