Apparatus, system, and method for high flux, compact compton x-ray source
First Claim
Patent Images
1. A system for generating x-rays by Compton backscattering, comprising:
- an electron storage ring including steering elements, focusing elements, and at least one RF cavity configured to guide and maintain an electron bunch injected into said electron storage ring in a stable and closed orbit over an extended time period sufficiently long that an injected electron bunch has at least one attribute related to the emission of x-rays by Compton backscattering that degrades after initial injection according to a time response for degradation, the electron storage ring guiding a circulating electron bunch through an interaction point disposed along a portion of said electron storage ring;
an injector for injecting electron bunches into said electron storage ring;
an ejector for ejecting electron bunches from said electron storage ring;
an optical system generating photon pulses coupled to said interaction point, said photon pulses synchronized to interact with corresponding electron bunches at said interaction point to generate x-ray radiation via Compton backscattering; and
a timing system refreshing the electron bunch stored in the electron storage ring by directing said injector and said ejector to implement a schedule to replace an electron bunch in which said at least one attribute has degraded with a fresh electron bunch to reduce the degradation of said at least one attribute related to the emission of x-rays compared with steady-state operation, the system replacing degraded electron bunches with fresh electron bunches such that the electron storage ring nearly continuously stores an electron bunch available for Compton backscattering.
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Abstract
A Compton backscattering x-ray source includes an electron storage ring for storing electron bunches. A timing system refreshes an orbiting electron bunch according to a schedule selected to improve at least one attribute of x-ray emission. In one implementation, the electron bunch is periodically refreshed with a period of at least about 10 Hz.
46 Citations
26 Claims
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1. A system for generating x-rays by Compton backscattering, comprising:
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an electron storage ring including steering elements, focusing elements, and at least one RF cavity configured to guide and maintain an electron bunch injected into said electron storage ring in a stable and closed orbit over an extended time period sufficiently long that an injected electron bunch has at least one attribute related to the emission of x-rays by Compton backscattering that degrades after initial injection according to a time response for degradation, the electron storage ring guiding a circulating electron bunch through an interaction point disposed along a portion of said electron storage ring; an injector for injecting electron bunches into said electron storage ring; an ejector for ejecting electron bunches from said electron storage ring; an optical system generating photon pulses coupled to said interaction point, said photon pulses synchronized to interact with corresponding electron bunches at said interaction point to generate x-ray radiation via Compton backscattering; and a timing system refreshing the electron bunch stored in the electron storage ring by directing said injector and said ejector to implement a schedule to replace an electron bunch in which said at least one attribute has degraded with a fresh electron bunch to reduce the degradation of said at least one attribute related to the emission of x-rays compared with steady-state operation, the system replacing degraded electron bunches with fresh electron bunches such that the electron storage ring nearly continuously stores an electron bunch available for Compton backscattering. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for generating x-rays by Compton backscattering, comprising:
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an electron storage ring including steering elements, focusing elements, and at least one RF cavity configured to guide and maintain an electron bunch injected into said electron storage ring in a stable and closed orbit over an extended time period sufficiently long that an injected electron bunch has at least one attribute related to the emission of x-rays by Compton backscattering that degrades after initial injection according to a time response for degradation, the electron storage ring guiding a circulating electron bunch through an interaction point disposed along a portion of said electron storage ring; an injector for producing, accelerating, and guiding electron bunches to said electron storage ring; a septum to guide a new injected electron bunch onto an initial trajectory near to the stable and closed orbit of said electron storage ring; a fast deflector to deflect a new electron bunch from the initial trajectory onto the stable and closed orbit of the electron storage ring and deflect an old electron bunch out of the stable and closed orbit; an optical system generating photon pulses coupled to said interaction point, said photon pulses synchronized to interact with corresponding electron bunches at said interaction point to generate x-ray radiation via Compton backscattering; and a timing system refreshing the electron bunch stored in the electron storage ring by directing said injector and said fast deflector to implement a schedule to replace an electron bunch in which said at least one attribute has degraded with a fresh electron bunch to reduce the degradation of said at least one attributerelated to the emission of x-rays compared with steady-state operation, said fast deflector being triggered by said timing system to spatially shift a newly injected electron bunch onto the stable and closed orbit of said electron storage ring and simultaneously eject an old circulating electron bunch into a dump such that the newly injected electron bunch replaces a degraded electron bunch within a pre-sclected time period and the electron storage ring nearly continuously stores an electron bunch available for Compton backscattering. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A system for generating x-rays by 180 degree Compton backscattering, comprising:
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an electron storage ring including steering elements, focusing elements, and at least one RF cavity configured to guide and maintain an electron bunch injected into said electron storage ring in a stable and closed orbit over an extended time period sufficiently long that an injected electron bunch has at least one attribute related to the emission of x-rays by Compton backscattering that degrades after initial injection according to a time response for degradation, the electron storage ring guiding a circulating electron bunch through an interaction point disposed along a portion of said electron storage ring; an injector for injecting electron bunches into said electron storage ring; an ejector for ejecting electron bunches from said electron storage ring; an optical system generating photon pulses coupled to said interaction point, the optical system including a passive high-finesse optical resonator resonantly driven by a mode-locked laser to build up an internally circulating photon pulse, the high-finesse optical resonator having a portion of an optical path coaxial with said interaction point and a mirror reflective to said photon pulses and transmissive to x-rays, the photon pulses circulating in said high-finesse optical resonator synchronized to interact with corresponding electron bunches at said interaction point to generate x-ray radiation via 180 degree Compton backscattering; and a timing system refreshing the electron bunch stored in the electron storage ring by directing said injector and said ejector to implement a schedule to replace an electron bunch in which said at least one attribute has degraded with a fresh electron bunch to reduce the degradation of said at least one attribute related to the emission of x-rays compared with steady-state operation, the system replacing degraded electron bunches with fresh electron bunches such that the electron storage ring nearly continuously stores an electron bunch available for Compton backscattering. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification