Apparatus for the production of short-wave electromagnetic radiation

Apparatus for the production of short-wave electromagnetic radiaion, especially in the x-ray and gamma-ray region, by means of the interaction between accelerated charged particles, especially electrons or positrons, and a crystal lattice, with a charged-particle source for the production of a beam (212, 312, 412, 512) of energetic charged particles and with a crystal arrangement (214, 314, 414, 514) which is so arranged in the path of the charged particle radiation beam that the charged particles traverse the crystal lattice of the crystal arrangement parallel to a predetermined lattice direction (lattice plane, lattice axis) ("channeling-condition"), comprising in combination a crystal arrangment (214, 314, 414, 514) and means for directing charged particles through said crystal arrangement in at least one plane passing through the axis of the charged particle radiation beam (212, 312, 412, 512) in directions which essentially converge into a predetermined point (220, 320, 520), said crystal arrangement having a side facing away from said charged particle source and a side facing toward said charged particle source, said crystal arrangement being so arranged in an arc about the predetermined point, that the channeling condition is substantially fulfilled for all charged particle beam paths.