Coil arrangement for adjusting the focus and/or correcting the aberration of streams of charged particles by electromagnetic deflection, particularly for sector field lenses in mass spectrometers
阅读：202发布：2023-06-21
专利汇可以提供Coil arrangement for adjusting the focus and/or correcting the aberration of streams of charged particles by electromagnetic deflection, particularly for sector field lenses in mass spectrometers专利检索，专利查询，专利分析的服务。并且A coil arrangement for adjusting the focus and/or correcting the aberration of streams of charged particles by electromagnetic deflection, particularly for sector field lenses in mass spectrometers, comprises flat coils produced in accordance with conventional printed circuit technology. Part of the turns of each coil is shaped to produce a locally changing magnetic field normal to the stream of charged particles for differentially affecting the particle paths according to their position in this magnetic field.，下面是Coil arrangement for adjusting the focus and/or correcting the aberration of streams of charged particles by electromagnetic deflection, particularly for sector field lenses in mass spectrometers专利的具体信息内容。
1. A coil arrangement for adjusting the focus and correcting the aberration of streams of charged particles by electromagnet deflection, particularly for sector field lenses in mass spectrometers, comprising the two following features in combination: a. a plurality of flat coils produced by conventional printed circuit techniques, and b. a part of the turns of each coil is appropriately shaped, with the turns of each coil being different from the turns of the other coils, to produce a locally modified magnetic field normal to the stream of charged partiCles for differentially affecting the paths of the particles according to their position in the magnetic field, whereby the magnetic field may be varied both in strength and distribution by adjusting the currents in the different coils individually.
2. A coil arrangement as set forth in claim 1, wherein the coils are so designed and shaped that their windings substantially conform with the contour lines of a rectangle.
3. A coil arrangement as set forth in claim 1, wherein the windings of that part of each coil which generates a locally modified magnetic field normal to the particle bundle are widened to form current-conducting laminae in that region in which they extend substantially parallel to the axis of the particle bundle.
4. A coil arrangement as set forth in claim 3, wherein each coil comprises a plurality of codirectionally wound interposed turns comprising current-conducting laminae generating a field of linearly with rising strength normal to the particle bundle and having the properties of a tetrapole lens.
5. A coil arrangement as set forth in claim 3, wherein each coil has only one turn comprising a current-conducting lamina generating a field of linearly with rising strength normal to the particle bundle and having the properties of a tetrapole lens.
6. A coil arrangement as set forth in claim 5, wherein the current-conducting lamina is a rectangle provided on opposite sides, where the current connections are situated, with openings near the edges so arranged and contrived that the current distribution in the lamina is approximately uniform over the entire lamina surface.
7. A coil arrangement as set forth in claim 5, wherein the current-conducting lamina is a rectangle provided on opposite sides, where the current connections are situated, with current conductors that have a lower ohmic resistance than the current-conducting lamina itself.
8. A coil arrangement as set forth in claim 5, wherein the current-conducting lamina is divided into ribbons by slits extending parallel to the axis of the particle bundle, the width of said ribbons being so chosen that the current distribution in the several ribbons is as uniform as possible across the entire conducting surface.
9. A coil arrangement as set forth in claim 8, wherein the slits between the current-conducting ribbons are provided only in the middle of the current-conducting lamina.
10. A coil arrangement as set forth in claim 3, wherein each coil comprises two like mirror-symmetrical coils connected in parallel in such a way that the current flows through them in opposite hands and produces a field which in the centre plane varies in proportion to x3 to provide the properties of an octapole lens.
11. A coil arrangement as set forth in claim 3, wherein each coil comprises two like mirror-symmetrical coils so connecting in series that the current flows through them in the same hand of rotation to generate a field which in the centre plane has a field distribution varying with x2 and thus providing the properties of a hexapole lens.
12. A coil arrangement as set forth in claim 3, wherein the coils having parts widened to form current-conducting laminae are associated with another flat coil produced according to the conventional techniques of printed circuit production, said additional coil being likewise shaped to conform with the contours of a rectangle but being evenly wound and lacking current-conducting laminae, as such to produce a homogeneous field parallel to the y-axis which, when affecting one particle bundle, causes the same deflection for all particle paths.
13. A coil arrangement as set forth in claim 1, wherein coils of different orders are stacked in the hollow interior of a yoke made of a ferromagnetic material and so arranged that a desired field distribution for effecting a correction is achieved across the direction of the charged particles.
14. A coil arrangement as set forth in claim 13, wherein the yoke has the form of an oblong box.
15. A coil arrangement as set forth in claim 13, wherein the yoke has the form of a hollow cylinder.
16. A coil arrangement as set forth in claim 15, wherein the coils of the same order are so located inside the yoke that they face each other in pairs.
17. A coil arrangement as set forth in claim 16, wherein the surface of the coils matches the internal shape of the yoke.
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