Michael Jentschel Institut Laue-Langevin ELI-NP, March 2011, Bucharest

Good Resolution: Perfect crystals Angle measurement Perfect crystals Gradient crystals Good for high resolution Good as high efficiency band pass filter

Dynamical Diffraction theory: Each el. cell is scattering center Scattering from indiv. Atoms is summarized via structure factor interference of forward/backward reflected partial waves from periodically arranged scattering centers Line profile Diffraction Angle Resolution is independent of Gamma Ray Energy Zachariasen, 1967

 B 10 -2 rad   10 -8 rad Diffraction process allows to have ppm resolution!

Double crystal Geometry ILL geometry: 4  source ELI case: ~10 -7 I

22% 3 rd order How does a crystal reflect, if the beam divergence fits its acceptance width ?

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

Source Spectrometer Table with angle interferometers Detector 1.Crystal 2.Crystal Beam Collimation Movable Collimation These beams need to be separated Large distances needed 21 m0.7 m3 m m

All fixations free of epoxy: optical bonding silica bonding mechanical clemping All fixations free of epoxy: optical bonding silica bonding mechanical clemping

GAMS 5 GAMS 6 (comissioning) 200 prad resolution 20 prad resolution

(n,) of 188 Re Complete spectra = Dynamic range of 10 6 Broadening due to: Atomic motion Lifetime Zero Point Fluctuation … 1.1MeV

Nuclear Structure Physics: Complete Spectroscopy Level Density/Chaos ,n), (,f), (,) reactions Fundamental Physics Fine structure constant Diffraction process Solid state Physics Atomic interaction Phase transitions Many others