A. V. Tuzikov

Superconducting synchrotron project for hadron therapy

The project of a superconducting medical synchrotron for carbon therapy in the ion energy range from 140 to 400 MeV/n is discussed in this paper. This project is aimed at developing and building a medical synchrotron on the basis of superconducting technologies at JINR under the construction of the Nuclotron accelerator complex. A linear accelerator with alternating phase focusing is proposed for injecting carbon ion into the synchrotron, while it is planned to use a superconducting gantry weighing about 150 t for delivering radiation treatment to patients from all directions.

A conceptual design of a power-supply system of deflecting plates for multivariate injection into the NICA accelerator complex booster

The design of the complex envisions the installation of three pairs of electric deflecting plates in the booster ring. These plates are designed to carry out the ion-beam injection into the booster in regimes of single-turn, multiturn, and multiple injection. We present a feasible scheme of a power-supply circuit that allows for all the prospective injection regimes through independent unipolar charging and discharging of the plates.

Conceptual design of the system of heavy-ion beam injection into the Booster of the NICA accelerator complex

A project of the system of heavy-ion beam injection into the Booster synchrotron of the NICA accelerator complex developed at the Joint Institute for Nuclear Research (Dubna) is considered. The proposed system provides multivariant injection for accumulating beams with required intensity. The main methods of beam injection into the Booster are described. These are the methods of one-turn, multiturn, and multiple injections. The results of beam dynamics simulations are presented.

Choosing the power-supply system and construction of the extraction kicker magnet of the NICA booster

Many versions of power-supply systems for NICA booster extraction-kicker magnets have been analyzed. They all satisfy the project parameters, but they differ in effectiveness, cost, difficulty in construction, and achievable spread of the kick force along the extracted bunch length. The considered variants include different types of capacitive energy storage (forming line and lumped capacity) and kicker magnets (with and without a ferrite core).

Pulsed ironfree inflectors for particle injection and extraction in cyclic accelerators

The layout of beam extraction from a cyclic accelerator using a pulsed septum magnet is presented. The magnetic field pulse duration is about 10 μs; the amplitude is about 1 T. The conceptual design of the septum and the power-supply circuit are described. The power-supply pulse generator provides a current of about 100 kA in the current loop with an inductance of 1 μH.

Processing digital images and calculation of beam emittance (pepper-pot method for the Krion source)

Programs for the pre-processing of photographs of beam images on the mask based on Wolfram Mathematica and Origin software are described. Angles of rotation around the axis and in the vertical plane are taken into account in the generation of the file with image coordinates. Results of the emittance calculation by the Pep_emit program written in Visual Basic using the generated file in the test mode are presented.

Gold ion beams induced desorption studies for Booster Nuclotron

Heavy ions induced pressure rise is one of the machine limits. The calculation results of the gold ion beam 197Au31+ losses due to residual gas interaction in view of desorption of adsorbed particles on the Booster Nuclotron vacuum chamber surface are discussed.

Beam transport channels and beam injection and extraction systems of the NICA accelerator complex

A new accelerator complex is being constructed at the Joint Institute for Nuclear Research as a part of the Nuclotron-based Ion Collider fAcility (NICA) project. The goal is to conduct experiments with colliding ion beams (at the first stage of the project) and colliding polarized proton/deuteron beams (at the second stage). Transport beam channels and the systems of beam injection and extraction for synchrotrons and collider rings are an important connecting link for the whole accelerator facility. The design of the primary beam-transport channels and injection/extraction systems are presented. Special attention is paid to various aspects of dynamics of beams in their transfer between the NICA accelerators.

Luminosity of the NICA Collider in working mode with using electron cooling system

The paper investigates the problem of balance between the intrabeam scattering, electron cooling and radiative recombination processes in the NICA Collider working mode with using of electron cooling system. The reducing methods of radiative recombination influence due to electron cooling are discussed.

Beam transportation lines for the NICA project

A heavy-ion collider, i.e., the Nuclotron-based Ion Collider Facility (NICA), is being developed at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia. The aim of this project is to construct a new accelerator complex for conducting experiments with colliding ion beam (at the first stage of the project) and with polarized proton and deuteron beams (at the second stage). The NICA accelerator complex will consist of two linear accelerators, two synchrotrons, two collider rings, and beam transportation lines. The magnetic lattice and diagnostic and correction systems for the NICA beam transportation lines are described in this report.