Compact Coherent X-Ray Source (CCXS)

Technology #14750

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FIG. 1 shows a compact coherent radiation source including an injector, a superconducting radiofrequency linear accelerator, an emittance exchange beamline, a coherent enhancement cavity, and an electron beam dump.FIG. 2 is a magnified photographic image of a tip array with 200-nm spacing and 80-nm gate apertures.  FIG. 3 shows a further magnified view of a double-gated tip, wherein the second gate provides focusing of each individual beamlet.FIG. 4 shows modeled electron beamlets from an 8×8 nanotip array at a focus gate.  FIG. 5 shows the electron beamlets of FIG. 4 downstream after focusing, wherein the electron beamlets are focused by individual microlenses that do not change the spacing between beamlets.FIG. 6 shows an emittance exchange beamline including two dogleg bending lines separated by a deflecting radiofrequency cavity. Each dogleg includes two dipole magnets of opposite polarity separated by a drift space.
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Inventors
Professor Franz Kaertner
Research Laboratory of Electronics, MIT
External Link (www.rle.mit.edu)
William Graves
Nuclear Reactor Laboratory, MIT
Professor David Moncton
Nuclear Reactor Laboratory, MIT
External Link (web.mit.edu)
Managed By
Dave Sossen
MIT Technology Licensing Officer
Patent Protection

Compact coherent current and radiation source

US Patent 8,787,529

This invention consists of a high performance compact coherent x-ray source.

Applications

This invention has a broad suite of applications in the industrial, scientific, military and medical fields. Specific uses includes EUV lithography, x-ray microscopy, protein crystallography, and studies of ultrafast phenomena. 

Problem Addressed

Current methods of x-ray generation includes bremsstrahlung x-rays from a tube, inverse compton scattering in either a small linear accelerator or via synchrotrons and x-ray free electron lasers. These methods are either non-coherent, inefficient or too expensive. Therefore, there is a need for a high performance x-ray source that is coherent, inexpensive and efficient.

Technology

The invention emits coherent radiation by first generating and transmitting an array of discrete electron beamlets from a nanocathode array along a longitudinal axis. Subsequently, an array of electron beamlets is focused to reduce the spacing that separates the electron beamlets. The transverse-axis spacing of the electron beamlets is then transferred to the longitudinal axis via an emittance exchange beamline, creating a periodically modulated distribution of coherent electronic current. The coherent electronic current can then be directed into a stream of photons to generate coherent x-ray radiation.

Advantages

  • The invention uses reduced electron energy, thus it is smaller in size and cheaper than current x-ray generation methods.
  • It can generate high performance x-rays similar to those produced by large synchrotron facilities and FELs.
  • It has improved spatial resolution over conventional radiography.