Conveners
Beams Interactions: S1.1
- LAURA BANDIERA (Istituto Nazionale di Fisica Nucleare)
Beams Interactions: S1.2
- Vincenzo Guidi (INFN)
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Dr Pascal Klag (Institut für Kernphysik, Universität Mainz)10/09/2024, 09:00invited
A new high-quality positron 530 MeV beam has been installed at the Institute for Nuclear Physics of the University of Mainz using the features of the MAMI accelerator. Positrons are created by pair conversion of bremsstrahlung, produced by a focused 855 MeV electron beam of MAMI in a 10 µm thick tungsten self converter target, and energy selected by an outside open electron beam-line bending...
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86. Positron Beam Steering via Planar Channeling and Volume Reflection with Silicon Crystals at MAMIRiccardo Negrello (Istituto Nazionale di Fisica Nucleare)10/09/2024, 09:30oral
Using a 530 MeV positron beam from the Mainz Microtron MAMI and a bent silicon crystal, we successfully manipulated positron trajectories through planar channeling and volume reflection. This experiment revealed detailed structures in the angular distribution of channeled charged particles within bent crystal planes. Our findings align with simulations, enhancing our understanding of...
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Vladimir Vysotskii (Kiev National Shevchenko Univ, Kiev, Ukraine)10/09/2024, 09:50oral
The work considers the mechanism of self-controlled autocollimation of a beam of positive ions during their channeling in crystals, which can lead to a significant reduction in the angular dispersion of the ions beam. The autocollimation process is associated with elastic ion scattering and stepwise transfer of the transverse energy E_\perp of a channeled ion to groups N \approx \Lambda / 2...
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Dr Vladimir Maisheev (IHEP, Protvino, Russia)10/09/2024, 10:10oral
An analytical model for the volume capture of high-energy positive particles into planar (111) channels of a silicon single crystal is proposed. Under the assumption that the cause of particle capture is multiple scattering, the capture probability is found. Channeling of trapped particles is also considered. Comparison of calculations with experiment is performed. Results of the study will...
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Alexei Sytov (Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara)10/09/2024, 10:30oral
In order to perform full simulations of crystal-based extraction from an accelerator, a combination of simulation codes for beam dynamics in an accelerator and channeling physics in crystals is required. Our solution exploits the Beam Delivery Simulation (BDSIM) [1], an extensive library that contains thick lens accelerator tracking routines and a wide variety of accelerator components and...
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Marco Romagnoni (University of Ferrara; INFN Ferrara Division)11/09/2024, 09:00invited
The efficiency of planar channeling for positive particles is limited by nuclear scattering when particles approach too close to the nuclei within the atomic planes. To mitigate this effect, a solution was proposed in 2007 [1], involving the creation of an optimized interruption in the crystal lattice at a strategic position before nuclear dechanneling can occur. Implementing this solution...
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Andrea Mazzolari (Istituto Nazionale di Fisica Nucleare)11/09/2024, 09:30oral
Bent crystals, through channeling effects, can induce coherent deflection of charged particles, making them invaluable tools for controlling particle beams. This research focuses on the fabrication, of bent crystals tailored for spin precession studies at the LHC.
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Matteo Bauce (Istituto Nazionale di Fisica Nucleare)11/09/2024, 09:50oral
Bent crystal have been widely used to deflect high energy particles in the last decades and the precise knowledge of their properties has been crucial for their deployment in particle accelerator complex. Based on a time-reversal approach to the channeling effect, the UA9 collaboration is investigating the possibility to merge two particle beam impinging with specific angles on a bent crystal....
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Dr Miccola Bondarenco (NSC Kharkov Institute of Physics and Technology, Ukraine)11/09/2024, 10:10
It is shown that if the screening function of an atomic potential may be described within the Thomas-Fermi approximation, the corresponding continuous potential for planar channeling to a good accuracy reduces to a truncated Coulomb potential. The sum of two displaced Coulomb potentials also accurately approximates thermal continuous potentials for (110) Si, Ge, W and (111) Ge oriented...
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Marko Cosic11/09/2024, 10:30oral
We have devised an experiment to reveal structures in angular distributions of axially channeled protons that are the most resistant to distortions caused by the multiple scattering with crystal electrons that, in the limiting process, erase all structures and produce a featureless Gaussian distribution. The origin of the observed shape stability was linked to the shape constancy of certain...
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Anton Stepanov11/09/2024, 10:50oral
Previously, calculations showed that the channeling of low-energy ions in SWCNTs leads to the emergence of many-particle interactions, which leads to the establishment of a special regime of particle motion in the SWCNT channel, similar to gliding [1]. In this work, using TD-DFT [2] and ab initio molecular dynamics [3] methods, a similar mechanism was considered, taking into account...
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