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

Session

7. Processes with Crystalline Targets

7 Sept 2015, 14:30

Conveners

7. Processes with Crystalline Targets

• Sultan Dabagov (INFN Laboratory Nazionaly di Frascati)

2. Nonlinear Combination (Raman) Scattering of Photons by the Channeled Positrons

Prof. Nikolay Kalashnikov (National Research Nuclear University "MEPhI")

07/09/2015, 14:30

7. Processes with Crystalline Targets

Oral

The channeled particles is characterized by the bound quantum states of its transversal motion. Photon interactions with the channeled particles in a single crystal may be accompanied by the energy transitions between the transverse motion levels of channeling particles. The photon combination (Raman) scattering by the quasi-bound channeled particles leads to the appearance of a frequency...

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

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

07/09/2015, 14:45

7. Processes with Crystalline Targets

Oral

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...

88. Extraction of carbon ions from the U-70 accelerator in beam line 4a by a bent crystal and measurements of a beam charge composition with scintillator and semiconductor detector

Dr Yury Chesnokov (Institute for High Energy Physics in National Research Centre “Kurchatov Institute”)

07/09/2015, 15:00

7. Processes with Crystalline Targets

Oral

The carbon ions +6C with energy 24.8 GeV/u were extracted from the U-70 ring by a bent Si crystal. The deflection angle of a beam by a crystal was 85 mrad. The measured beam intensity in beam line 4a was about 1E05 particles at 1E09 circulated ions in the ring. The scintillation counters were installed in beam center while the semiconductor detector was installed in 43 mm away from the beam...

60. Planar and Axial Channeling of Relativistic Electrons in Half-Wave Silicon Crystal and Corresponding Radiation

Timur Tukhfatullin (National Research Tomsk Polytechnic University)

07/09/2015, 15:15

7. Processes with Crystalline Targets

Oral

Half-wavelength crystal (HWC) is a thin crystal, when a channeled particle experiences only one collision with crystallographic plane during its motion through a HWC crystal. Recently, the authors of Ref. [1] experimentally demonstrated that planar channeled 2 MeV protons were successfully mirrored by a thin silicon HWC. In continuation of this work, the mirroring effect was observed at very...

38. Estimation of the spatial sizes of ultra relativistic electrons beam from angular distribution of their emission in thin crystals

Prof. Igor Vnukov (Belgorod National Research University 14 Studencheskaya str., 308007 Belgorod, Russia)

07/09/2015, 15:30

7. Processes with Crystalline Targets

Oral

The use of ultra relativistic electron (positron) emission in thin crystals to estimate particle beam spatial sizes for projected electron-positron colliders [1,2] is proposed. The existing position-sensitive X-ray range detectors and the average path of secondary electrons in a detector restrict the minimum value of the measured beam size to a level of approximately 10 μm, which is far...

4. Wave Functions of Channeling Electrons in Regular and Chaotic Cases

Prof. Vladislav Syshchenko (Belgorod National Research University, Belgorod, Russian Federation)

07/09/2015, 15:45

7. Processes with Crystalline Targets

Oral

The motion of fast electrons through the crystal under axial channeling could be both regular and chaotic [1, 2]. The chaotic character of quantum systems manifests itself in different ways [3]. The evidence of quantum chaos in statistical properties of energy spectra of channeling electrons had been demonstrated in [4]. In the present report we demonstrate qualitative difference between...