Beam-driven short wavelength undulator
AssigneeEuclid Techlabs, LLC
InventorsAlexei Kanareykin, Chunguang Jing, Alexander Zholents
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Abstract
A technique for producing a coherent beam of hard X-rays is provided. This technique is based on a short wavelength undulator that uses the fields of an electromagnetic wave to deflect a relativistic electron beam along a sinusoidal trajectory in order to cause it to emit X-rays. The undulator consists of a slow-wave structure that is energized by a second counterpropagating electron beam. Cylindrical and planar structure configurations are provided and also a mechanism for electrical and mechanical tuning to allow control over the wavelength of the emitted X-ray beam.
Claims26
A nonmagnetic undulator for generating short wavelength coherent high power electromagnetic radiation from a high energy electron beam without the use of periodic static magnetic fields comprising:
- a first charged particle beam;
- a slow-wave cavity structure that generates a transverse deflecting field from said first charged particle beam passing there through by means of a wakefield induced in the structure by the beam;
- a second charge particle beam counter propagating to said first charged particle beam;
- wherein said transverse deflecting field imparts a transverse oscillation to said second counter propagating beam that causes emission of synchrotron radiation in the form of coherent X-ray beam.
A nonmagnetic undulator for generating short wavelength coherent high power electromagnetic radiation from a high energy electron beam without the use of periodic static magnetic fields comprising:
- a first charged particle beam;
- a slow-wave cavity structure that generates a transverse deflecting field from said first charged particle beam passing there through by means of a wakefield induced in the structure by the beam;
- a second charge particle beam counter propagating to said first charged particle beam;
- wherein said transverse deflecting field imparts a transverse oscillation to said second counter propagating beam that causes emission of synchrotron radiation in the form of coherent X-ray beam;
- wherein a polarization of said coherent X-ray beam can be altered by changing a plane of offset between said first charged particle beam and said second charged particle beam.
A nonmagnetic undulator for generating short wavelength coherent high power electromagnetic radiation from a high energy electron beam without the use of periodic static magnetic fields comprising:
- a first charged particle beam;
- a slow-wave cavity structure that generates a transverse deflecting field from said first charged particle beam passing there through by means of a wakefield induced in the structure by the beam;
- a second charge particle beam counter propagating to said first charged particle beam;
- wherein said transverse deflecting field imparts a transverse oscillation to said second counter propagating beam that causes emission of synchrotron radiation in the form of coherent X-ray beam;
- and
- a planar geometry dielectric structure that is tuned to produce a variable wavelength X-ray beam by changing a period of a beam oscillation induced by the cavity.
A beam driven undulator for generating coherent short wavelength radiation comprising:
- a slow-wave cavity structure having an interior periodic array of oscillation inducing structures offset from an axis and forming an aperture;
- a source for generating a first electron beam directed through said cavity structure at a transverse offset from said axis, said first beam capable of generating a transverse deflecting wakefield by image currents of said first electron beam in said oscillation inducing structures;
- a source for generating a second electron beam in a counter-propagating direction from said first beam, said second beam being deflected into an oscillatory path induced by said wakefield without the use of periodic static magnetic fields;
- wherein a coherent beam of hard X-rays is produced by said second electron beam and emitted through said aperture.
A method for producing a coherent beam of hard X-rays comprising:
- a. passing a first charged particle beam (the drive beam) off axis through a slow-wave cavity structure;
- b. generating a transverse deflecting wakefield within said slow-wave structure by energizing said slow-wave cavity structure with said first charged particle beam;
- and
- c. passing a second counterpropagating charged particle beam (the undulator beam) through the transverse deflecting field in the said energized slow-wave structure, said second counterpropagating charged particle beam being oriented 180 degrees with respect to the direction of said first charged particle beam;
- wherein a short wavelength undulation of said second charged particle beam is induced by passing through said transverse wakefield, and thereby causing the second beam to move along a sinusoidal trajectory such that X-rays are emitted coherently.
A beam driven undulator for generating coherent short wavelength radiation comprising:
- a dielectric channel having parallel dielectric and ferroelectric slabs running along a first length of said channel;
- a movable conducting wall fitted to move inside said channel and having parallel dielectric and ferroelectric slabs running along a second length of said wall;
- an adjustable gap formed between said the dielectric channel and the conducting wall;
- a charged particle drive beam and a counter propagating charged particle undulator beam travelling in opposite directions relative to a linear channel axis;
- said undulator beam being deflected into an oscillatory path induced by a wakefield formed without the use of periodic static magnetic fields;
- wherein a coherent beam of hard X-rays is produced by said charge particle drive beam as it counter propagates through said wakefield.
Dependencies are inferred from the claim text.