Undulator magnet, undulator, and radiation light generating device

An undulator that generates radiation light by meandering electrons, comprising:

• a vacuum chamber having a passage therein through which the electrons pass in a predetermined direction;
• and
• a pair of magnet arrays that are arranged to face each other with the passage therebetween in the vacuum chamber,
• wherein each of the pair of magnet arrays includes,
• on magnetic pole surfaces that face each other, magnetic poles that attract each other and are alternately arranged in the predetermined direction such that a magnetic flux density distribution having a plurality of peaks in the passage is generated, and
• a pair of magnets formed by connecting
• a first connecting surface of an undulator permanent magnet used for an undulator that generates radiation light by meandering electrons that travel in a first direction in which one end surface in the first direction forms the first connecting surface connected to another undulator permanent magnet, N poles and S poles are alternately arranged in the first direction on one magnetic pole surface in a second direction orthogonal to the first direction, and thus a magnetic flux density distribution having a plurality of peaks is generated, and when the plurality of peaks are represented as the first to m-th peaks Pm (m is an integer of 1 or more) in order from the side of the first connecting surface, a magnitude of the first peak P1 is larger than a magnitude of the third peak P3, and the first connecting surface has a convex connecting part that is convex in the first direction, and
• a first connecting surface or a second connecting surface of the undulator permanent magnet used for an undulator that generates radiation light by meandering electrons that travel in the first direction in which one end surface in the first direction forms the first connecting surface connected to another undulator permanent magnet, N poles and S poles are alternately arranged in the first direction on one magnetic pole surface in a second direction orthogonal to the first direction, and thus a magnetic flux density distribution having a plurality of peaks is generated, and when the plurality of peaks are represented as the first to m-th peaks Pm (m is an integer of 1 or more) in order from the side of the first connecting surface, a magnitude of the first peak P1 is larger than a magnitude of the third peak P3, the other end surface in the first direction is the second connecting surface connected to another undulator permanent magnet, when the plurality of peaks are represented as the first to n-th peaks Qn (n is an integer of 1 or more) in order from the side of the second connecting surface, a magnitude of the first peak Q1 is larger than a magnitude of the third peak Q3, a direction of a magnetic flux density of the first peak P1 and a direction of a magnetic flux density of the first peak Q1 are opposite to each other, and one of the first connecting surface and the second connecting surface is a concave connecting part that is concave in the first direction,
• wherein a direction of a magnetic flux density of a first peak when viewed from the side of a connecting surface of the pair of magnets of a magnetic flux density distribution in the first direction of one undulator permanent magnet of the pair of magnets and a direction of a magnetic flux density of a first peak when viewed from the side of the connecting surface of a magnetic flux density distribution in the first direction of the other undulator permanent magnet of the pair of magnets are opposite to each other.

An undulator that generates radiation light by meandering electrons, comprising:

• a vacuum chamber having a passage therein through which the electrons pass in a predetermined direction;
• and
• a pair of magnet arrays that are arranged to face each other with the passage therebetween in the vacuum chamber,
• wherein each of the pair of magnet arrays includes,
• on magnetic pole surfaces that face each other, magnetic poles that attract each other and are alternately arranged in the predetermined direction such that a magnetic flux density distribution having a plurality of peaks in the passage is generated, and
• a pair of magnets formed by connecting
• a first connecting surface of an undulator permanent magnet including a concave connecting part of the undulator permanent magnet used for an undulator that generates radiation light by meandering electrons that travel in the first direction in which one end surface in the first direction forms the first connecting surface connected to another undulator permanent magnet, N poles and S poles are alternately arranged in the first direction on one magnetic pole surface in a second direction orthogonal to the first direction, and thus a magnetic flux density distribution having a plurality of peaks is generated, when the plurality of peaks are represented as the first to m-th peaks Pm (m is an integer of 1 or more) in order from the side of the first connecting surface, a magnitude of the first peak P1 is larger than a magnitude of the third peak P3, and the first connecting surface has the concave connecting part that is concave in the first direction, and
• a first connecting surface or a second connecting surface of the undulator permanent magnet used for an undulator that generates radiation light by meandering electrons that travel in the first direction in which one end surface in the first direction forms the first connecting surface connected to another undulator permanent magnet, N poles and S poles are alternately arranged in the first direction on one magnetic pole surface in a second direction orthogonal to the first direction, and thus a magnetic flux density distribution having a plurality of peaks is generated, and when the plurality of peaks are represented as the first to m-th peaks Pm (m is an integer of 1 or more) in order from the side of the first connecting surface, a magnitude of the first peak P1 is larger than a magnitude of the third peak P3, the other end surface in the first direction is the second connecting surface connected to another undulator permanent magnet, when the plurality of peaks are represented as the first to n-th peaks Qn (n is an integer of 1 or more) in order from the side of the second connecting surface, a magnitude of the first peak Q1 is larger than a magnitude of the third peak Q3, a direction of a magnetic flux density of the first peak P1 and a direction of a magnetic flux density of the first peak Q1 are opposite to each other, and one of the first connecting surface and the second connecting surface is a convex connecting part that is convex in the first direction,
• wherein a direction of a magnetic flux density of a first peak when viewed from the side of a connecting surface of the pair of magnets of a magnetic flux density distribution in the first direction of one undulator permanent magnet of the pair of magnets and a direction of a magnetic flux density of a first peak when viewed from the side of the connecting surface of a magnetic flux density distribution in the first direction of the other undulator permanent magnet of the pair of magnets are opposite to each other.