Joint International Workshop for Super-Charm Tau Facility

Specialists of the Budker Institute of Nuclear Physics (BINP, Russia) presented the latest developments on the project of the electron-positron collider Super C-tau factory at the “Joint International Workshop for Super-Charm Tau Facility” devoted to future electron-positron colliders.

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Specialists of the Budker Institute of Nuclear Physics (BINP, Russia) presented the latest developments on the project of the electron-positron collider Super C-tau factory at the “Joint International Workshop for Super-Charm Tau Facility” devoted to future electron-positron colliders.

The development of the Russian Super C-tau factory is part of the EU project CremlinPlus, which aims to develop and strengthen scientific cooperation between Russia and the European Union in the field of research infrastructure, and is already in the final stage of development. It started in 2011, after the Russian government has selected six mega science projects to be realized in the near future. After being included into the Strategy for Scientific and Technological Development of Russia in 2017, it became an important part in the "Akademgorodok 2.0" program already one year later.

The workshop was held in 2020 as a part of a series of meetings which started in 2018 in Orsay (France) and continued in Moscow (Russia) in 2019. Currently, there are plans for two projects including electron-positron colliders in China (Hefei) and Russia (Novosibirsk) with a large variety of physics programs such as studying particles containing charmed quarks, solving unanswered questions and searching for new physics beyond the Standard Model.
During the meeting, many different detector and accelerator technologies were presented. The specialists in the Budker Institute of Nuclear Physics (BINP) Novosibirsk work on the optimization of the magnetic structure, modeling, and studying the effects limiting the luminosity and the lifetime of the beam and nonlinear effects. Concepts for the monochromatization of particle beams have additionally been discussed.
“Monochromatization is one of the important characteristics of the collider. It is a decrease in the energy spread of particles in a collision.” explained Semyon Eidelman, Chief Researcher of the BINP, Head of the Laboratory of the Interdisciplinary Center for Elementary Particle Physics and Astrophysics at the Novosibirsk State University (NSU). As being a part of the CremlinPlus project, a small collaboration of the BINP and foreign partners in Switzerland, France, Italy, and Germany works together on a work package including research and development of trackers, drift chambers, and particle identification systems which have been presented in the workshop. The separation of charged particles will be done with the help of two different Cherenkov detector types. These detector systems are currently under development at the BINP and the Justus Liebig University (JLU) in Giessen (Germany) from 2018.

“The parallel development of two variants of the identification system creates healthy competition, but above all, synergy: this is cooperation on common tasks, exchange of experience, contacts with experts and manufacturers, human and material resources.” said Sergey Kononov, a researcher at the BINP. The scientists in Novosibirsk have a high expertise in constructing Cherenkov detectors made of Aerogel, a synthetic, ultralight, and porous material with a very small refractive index. This material is planned to be used in the FARICH detector for the Russian Super C-Tau factory. The design of the F-DIRC from Giessen contains, in contrast to that, a radiator plate made of synthetic fused silica with properties that are more similar to ordinary glass.
Alexander Barnyakov, a senior researcher at the BINP, explained: “Each of the aforementioned areas involves a close participation of BINP, we are not talking about delegating responsibility to our partners, but about joint work, which is distributed between European institutions and us. A successful implementation of the tasks of the CREMLINplus project presupposes regular communication between scientists from different countries and institutes, joint work planning, and joint tests. In addition to the tasks solved within the framework of the CREMLINplus program, the BINP has been independently working on the project for many years.”

On the last day of the workshop, the participants discussed possible synergies between the two projects. “Both projects are international. Therefore it is very important to involve foreign specialists in the work. Interest in experiments at Super C-Tau factories was noted during the discussion of the update of the European strategy for particle physics (initiated by CERN) and recorded in a summary document (Physics Briefing Book). This is an evidence of the relevance of scientific problems of our projects", said Vitaly Vorobyov, another senior researcher at the BINP.

Text by CREMLINplus participant Mustafa Schmidt (JLU, WP5)