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— VEPP-2000 is an electron-positron collider with round beams built and operating at the Budker Institute of Nuclear Physics. The integrated luminosity accumulated over last 2 years has reached 0.5 fb –1 with peak luminosity of 0.9 × 10 32 cm –2 s –1 . The short description of the VEPP-2000 complex and current status with achieved results are presented.

We describe a method and a setup based on it which has been used to measure the production cross sections of the delayed-neutron precursors ( 9 Li, 16 C, and 17 N) and the fractional delayed-neutron yields in interactions between relativistic protons with an energy of 1 GeV and target nuclei with mass numbers in the range of 12−238. Measurements have been made at the synchrocyclotron facility of the Petersburg Institute of Nuclear Physics (PNPI), Gatchina. The measured cross section for the generation of 17 N nuclei versus the mass of target nuclei are shown as an illustration of the method. The fractional delayed-neutron yields in interactions of relativistic protons with 238 U nuclei are also presented.

The key elements of the compact accelerator-driving neutron source (CANS) dedicated to academic research and industrial applications (DARIA) have been developed. A pulsed proton linear accelerator with an energy of 13 MeV, a current of 100 mA, a pulse length of 100 μs, and a repetition rate of 100 pulses/s is under development for the DARIA CANS. An improved version of the GISMO ion source has been developed to generate the beam. The parameters of the accelerator line consisting of the RF quadrupole (RFQ) linac and the drift tube linac (DTL) have been determined by numerical simulation. The parameters and model of a hybrid magnetic lens for beam focusing are presented. A Faraday cup for diagnosing a high-intensity beam has been manufactured and tested. The developed prototypes of the target assembly based on beryllium and mesitylene moderator have confirmed the correctness of the selected engineering solutions. The physical parameters of the neutron-guiding systems have been determined in terms of the maximum luminosity of the device at a good instrumental resolution.

The work considers the mode of “soft” input of an ion beam into an accelerator, in which an electrostatic Q-snout lens (preaccelerating electrode) is used. Analytical and numerical calculations of the trajectories, phase portrait, and emittance of proton and deuteron beams were carried out in the energy range 0.2–2.3 MeV. It is shown that the use of a preaccelerating electrostatic lens allows one to avoid refocusing of the beam by the strong input lens of the accelerator and improve its passage through the ion-optical path. In this focusing mode, the phase portrait of the proton beam is less sensitive to changes in current and ion energy, which is important for medical installations and for its use in other applications.

Data taking has been started at the first stage of the SPASCHARM experiment on systematic study of the spin effects in strong interactions. The current setup configuration is described, and the detector characteristics attained during the beam data taking in the runs of 2018–2022 are listed.

The final-focus solenoids of the VEPP‑2000 round-beam e + e − collider are able to cause stopbands in the betatron tune plane. The available tune space in the most important region near the parametric resonances (above the integer tunes) is limited by this specific stopband domain. The combined effect of the decompensated solenoids and the parametric resonances at the integers is theoretically studied. The results are complemented with numerical investigations and simulation using the RING program. The stability domain boundaries in the betatron tune plane have been experimentally determined, and their position is in good agreement with the theoretical expectations.

A technique for developing a fast summing preamplifier for resistive plate counters of the HARP experiment (PS214, CERN) is presented. The classic analog adder has been redesigned to obtain a minimum intrinsic jitter of 26 ps. This jitter has been attained via a trade-off with a charge summation accuracy of ~5%. The summing preamplifier has eight inputs and is based on the principle of summing a 104 × 240-mm 2 readout area containing eight strips with dimensions of 104 × 29 mm 2 . The preamplifier is located inside the chamber. Its conversion factor is 100 mV/pC at a charge collection time of approximately 1 ns. The spread of the systematic timing error at the inputs is less than 30 ps. The power consumption is 350 mW. There are 368 summing amplifiers in the time-of-flight system.

— A new compact time-of-flight neutron detector is being planned for the identification and energy measurement of neutrons produced in nucleus-nucleus interactions at energies up to 4 AGeV at the BM@N experiment, located at the Nuclotron (Joint Institute for Nuclear Research, Dubna, Russia). This detector will be used to measure neutron yields and azimuthal flows, which should be sensitive to the equation of state of dense nuclear matter, as shown in various theoretical models It is proposed to use plastic scintillators produced at JINR and IFTP and silicon photomultipliers with a sensitive area of 6 × 6 mm 2 for photon registration, one for each scintillation cell. To achieve the required neutron energy resolution (of the order of several percent) in the energy range up to 4 GeV, the time resolution of scintillation detectors should be 100−150 ps. The concept of a time-of-flight neutron detector is discussed. The results of measurements of the light yield and time resolution of several scintillation detector specimens of various sizes and two types of silicon photomultipliers are presented.

Budker Institute of Nuclear Physics (Siberian Branch, Russian Academy of Sciences) continues to create a high-voltage electron cooling system for the NICA collider, which is necessary to achieve the design luminosity of the complex in ion–ion collisions. The system consists of two independent coolers with an electron energy of up to 2.5 MeV with current of up to 1 A, which simultaneously cool two colliding ion beams. The article describes the status of the system and the results of testing of its elements.

The Nanogate‑38 gated camera was used to measure the transverse beam dimensions in the BEP booster of the VEPP‑2000 electron−positron collider. The camera is used to measure the vertical beam size by a double-slit interferometer and to visualize a transverse beam profile in single-turn mode with the projection optics. The purpose of the experiments is to assess the applicability of the camera to measurements of the transverse beam dimensions and beam emittance in accelerator experiments at the SKIF synchrotron-radiation source.