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DESY News: Joint DESY-Ukraine project receives grant from the German Research Foundation

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2024/02/23
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Joint DESY-Ukraine project receives grant from the German Research Foundation

A group of researchers from DESY and the Kharkov Institute of Physics and Technology KIPT(Ukraine) receives a grant from the German Research Foundation for studying the possibility to scrape off electrons from a booster synchrotron using a bent crystal. This might be of potential interest in view of future Test Beam Facilities.

Sergii Fomin, leading researcher at the National Scientific Centre “Kharkov Institute of Physics and Technology' (NSC KIPT, Kharkov, Ukraine), was forced to leave Ukraine after the start of the full-scale Russian invasion. Currently employed as researcher at DESY in the Machine Diagnostic and Instrumentation (MDI) group, he recently received a grant from the German Research Foundation to study the feasibility of extracting electron beams in a booster synchrotron using a bent crystal technology. Photo: DESY, Christina Mänz
The ability of a bent crystal to deflect beams of positively charged particles, based on aphenomenon caused by the crystal lattice, has been studied and is used at many high-energy proton accelerators (IHEP, JINR, FNAL, CERN, etc.) to clean the beam halo, as well as to implement the so-called slow extraction of particles from a cyclic accelerator. The latter makes it possible to create additional beam lines without the use of any magnetic systems and distortion of the main beam in a cyclic accelerator. In this case, the crystal deflects only particles of the beam halo, thereby even improving the parameters of the main beam. However, this method is not suitable for deflecting negatively charged particles, for which the channeling regime in the crystal turns out to be significantly unstable.

An alternative mechanism for deflecting particle beams using a curved crystal was proposed at KIPT in the works of Anatoly Grinenko and Nikolai Shul’ga. This so called Grinenko-Shul’ga mechanism is based on stochastic scattering of fast charged particles on atomic chains of a bent crystal and is effective for both positively and negatively charged particles. Recent CERN experiments performed on secondary electron and positron beams at the SPS accelerator have successfully confirmed the main theoretical predictions.

The now received grant, which will last two years, will allow a detailed study of the effectiveness of the Grinenko-Shul’ga mechanism in relation to the conditions of the DESY accelerator in order to determine the optimal installation parameters for the implementation of a slow electron beam extraction.

The participants in this joint project are a group of scientists from the Department of Electrodynamics of High Energy in Matter at KIPT and a group of researchers from the DESY Accelerator Department.

“This joint project is an excellent example of combining the experience and knowledge of different groups of scientists from two countries to achieve common goals and mutual benefit,” says DESY scientist Gero Kube, spokesperson of the group. “It also provides an opportunity to support Ukrainian scientists in this difficult time, and to raise cooperation between two scientific centers to a higher level.”

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