Radiation from Relativistic Electrons in Periodic Structures "RREPS-15"

On the Fabrication and Experiments with Micrometric and Nanometric Silicon Plates for Channeling Experiments

7 Sept 2015, 14:45

15m

Oral 7. Processes with Crystalline Targets 7. Processes with Crystalline Targets

Speakers

Dr Andrea Mazzolari ((University of Ferrara and INFN section of Ferrara (Italy))Mr Giacomo Germogli ((University of Ferrara and INFN section of Ferrara (Italy))

Description

In the last years, thanks to innovative techniques for crystals design and fabrication based on silicon micromachining, micrometric and nanometric thick silicon crystal plates suitable for beam manipulation through coherent interactions and hard radiation generation were produced. Thin bent crystals which allowed for the first time efficient steering of negatively-charged particles at sub-GeV energy (855 MeV at MAMI [1]) were manufactured [2]. Achievement of a rather high deflection efficiency allowed to study radiation emitted by channeled and volume reflected sub-GeV electrons [3]. Similarly, an electron beam in the 1 to 10 GeV energy range was deflected at SLAC [4]. As an alternative scheme, to deflect a charged particles beam a straight crystals whose thickness is half of the oscillation length for planar channeling can be used. Encouraging results were obtained with protons by finely adjusting thickness according to beam energy (92 nm thickness at 2 MeV and 26.5 µm thickness at 400 GeV). References 1. A. Mazzolari et al., Phys. Rev. Lett. 112, 135503 (2014). 2. G. Germogli et al., Nucl. Ins. and Meth. B 355 (2015) 3. L. Bandiera et al., Phys. Rev. Lett. 115, 025504 (2015) 4. U. Wienands et al., Phys. Rev. Lett. 114, 074801 (2015) 5. V. Guidi et al., Phys. Rev. Lett. 112, 014801 (2012) 6. W. Scandale et al., Phys. Lett. B 734, 1 (2014).