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Monochromatisation of g -rays with ppm resolution via Crystal Diffraction

Monochromatisation of g -rays with ppm resolution via Crystal Diffraction. Michael Jentschel Institut Laue- Langevin. ELI-NP, March 2011, Bucharest. Monochromatisation via Laue - Diffraction. Good Resolution: Perfect crystals Angle measurement. Gradient crystals. Perfect crystals.

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Monochromatisation of g -rays with ppm resolution via Crystal Diffraction

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  1. Monochromatisation of g-rays with ppm resolution via Crystal Diffraction Michael Jentschel Institut Laue-Langevin ELI-NP, March 2011, Bucharest

  2. Monochromatisation via Laue - Diffraction • Good Resolution: • Perfect crystals • Angle measurement Gradient crystals Perfect crystals Good for high resolution Good as high efficiency band pass filter

  3. Laue-Diffraction at a perfect crystal Line profile Zachariasen, 1967 Diffraction Angle Resolution is independent of Gamma Ray Energy

  4. Estimate of possible resolution DqB ~10-8rad qB~10-2rad Diffraction process allows to have ppm resolution!

  5. Double crystal Geometry ILL geometry: 4p source 1016 10-6 10-5 10-2 103 ELI case: ~10-7 I0

  6. Diffraction efficiency of perfect crystals How does a crystal reflect, if the beam divergence fits its acceptance width ? 3rd order 22%

  7. M. Wegener Karlsruhe Institute of Technology Adapting divergence via refractive optics To be tested for gamma rays in 2011 A. Sinigrev, ESRF, Grenoble www.X-ray-optics.com

  8. Layout and Functioning of the ILL Double Crystal Spectrometer GAMS 2.Crystal 0.002 m 1.Crystal Movable Collimation Detector Source Beam Collimation Spectrometer Table with angle interferometers These beams need to be separated Large distances needed 21 m 0.7 m 3 m

  9. Interferometer of GAMS6: realisation • All fixations free of epoxy: • optical bonding • silica bonding • mechanical clemping

  10. Crystal Spectrometers GAMS GAMS 6 (comissioning) 200 prad resolution GAMS 5 20 prad resolution

  11. What can you get from high resolution (n,g) of 188Re 1.1MeV t=220+180-30 Complete spectra • Broadening due to: • Atomic motion • Lifetime • Zero Point Fluctuation • … Dynamic range of 106

  12. Physics with ppm resolution • Nuclear Structure Physics: • Complete Spectroscopy • Level Density/Chaos • (g,n), (g,f), (g,a) reactions • Fundamental Physics • Fine structure constant • Diffraction process • Solid state Physics • Atomic interaction • Phase transitions • Many others

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