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Preprints and Communications

Here you can find JINR preprints and communications in pdf format starting from 1999.
File size is given in bytes in round brackets.

Subject Categories for JINR Publications Archive (1999 - 2018)


2019
P9-2019-35 (309.270)
Vasilishin B. V. et al.
The System of Cycle Setting for Nuclotron Booster

The main and two additional currents of the magnetic system of the Nuclotron booster are controlled by three sets of «+» and «» series of pulses, causing an increase or decrease in the corresponding current by the amount of «quantum» of the current, the value of which is taken to be 0.01 A. In addition, to control the main current, the sequences of «+» and «» series describing the derivative of the main current I'0 with the value of «quantum» equal to 0.04 A/s are also required. The peculiarity of used power supplies is that they are controlled directly by series pulses, and not by analog signals obtained from them. The control of software, equipment and exchange with the database is performed in the standard of TANGO system.

P13-2019-24 (435.323)
Pepelyshev Yu. N., Popov A. K., Sumkhuu D.
The Kinetics of the Pulsed Booster with a Proton Injector

The kinetics of the pulsed booster as an advanced high-flux pulsed neutron source, which is foreseen to replace the IBR-2M pulsed reactor after an exhaust of its service life, is considered. As a booster, a subcritical multiplying assembly with a reactivity modulator, which amplifies neutron pulses generated on a non-multiplying target as a result of the injection of accelerator protons into it, is described. The parameters of neutron pulses of the assembly with a frequency of 30 Hz at various values of the effective lifetime of prompt neutrons and effective multiplication factor of assembly (0.95 and 0.98) are calculated. These calculations allow one to choose the optimal variant of the parameters of the modulator of reactivity, the subcritical rate, the effective lifetime of the prompt neutrons of the assembly, etc.

E1-2019-21 (141.704)
Baatar Ts. et al.
Cumulative Proton Production in π + C Interactions at 40 GeV/ c and the Uncertainty Principle

We study the cumulative proton production in π + C interactions at 40 GeV/c. Cumulative protons, in comparison with the noncumulative ones, are produced at large values of the variable nc (nc > 1.0) and in this region the energy of cumulative protons also increases. The experimental values of the cumulative proton energies are compared with the estimations obtained by the formula of the uncertainty principle. It has been shown that the energy of cumulative protons obtained by using the formula of the uncertainty principle is in agreement with the experimental results to an accuracy of less than ∼ 10.

P16-2019-16 (329.957)
Mokrov Yu. V., Morozova S. V.
The Correction of Albedo Dosimeters DVGN-01 Readout at the Neutron Generator EG-5 with the Help of a Spherical Albedo System

The results of readout correction for albedo dosimeters DVGN-01 using a spherical albedo system are presented. The measurements were carried out behind the neutron generator EG-5. On the basis of the presented results, the correction coefficients were recommended for individual radiation control at the neutron generator.

P11-2019-9 (86.985)
Amirkhanov I. V., Sarker N. R., Sarkhadov I.
About One Method of Approximate-Analytical Solution of the Quantum-Mechanical Three-Body Problem

A method is proposed for investigating the solutions of a single quantum-mechanical three-body problem. The boundary value problem for a system of two particles moving in the potential field of the third particle is studied. The interaction potentials between the particles are chosen to be quadratically growing. In this case, the two-body problem has an exact solution. The solution of the original three-body problem is represented as an expansion in the solutions of the two-body problem. The coefficients of the expansion yield a homogeneous linear matrix equation. Equating the determinant of this equation to zero, we find the eigenvalues of the original problem and the coefficients of the expansion. Since the elements of the matrix of algebraic equations with solutions of the two-body problem are calculated analytically, the eigenvalues of the three-body problem depend explicitly on the parameters of the potentials. Changing these parameters in an arbitrary way, we can obtain the desired spectra, i.e., one can control the eigenvalues of the original problem.

P3-2019-8 (239.209)
Rzyanin M. V., Shabalin E. P.
On the Issue of Stability and Safety of the Superbooster «Neptun»

Highly intense pulsed neutron source which should replace the pulsed reactor IBR-2M currently in operation after its wear-out, can be made as superbooster, that is a powerful breeder of neutrons produced in accelerating proton target. Usually, superbooster is considered to be a safe and reliable nuclear facility. However, as indicated in the paper, powerful superbooster can be less stable in operation than pulsed reactor. Therefore, problems of its safety call for close study.

E9-2019-4 (170.120)
Sumbaev A. P., Barnyakov A. Yu., Levichev A. E.
On the Limits for the Accelerated Beam Current in the LUE-200 Linac of the IREN Faility

The beam current loading of the accelerating fields is discussed for the linear accelerator LUE-200 of the IREN facility (a neutron source at the Frank Laboratory of Neutron Physics, JINR). The LUE-200 electron linac consists of two disk loaded traveling wave accelerating structures with the operating frequency of 2856 MHz and SLED-type power compression system. The limits for the accelerated beam current are defined for different pulse durations of the beam current and RF power. The calculated results are discussed and compared with the measurements.

E9-2019-2 (585.768)
Karamyshev O. et al.
Conceptual Design of the SC230 Superconducting Cyclotron for Proton Therapy

Physical design of the compact superconducting cyclotron SC230 has been performed. The cyclotron will deliver up to 230 MeV beam for proton therapy and medico-biological research. We have performed simulations of magnetic and accelerating systems of the SC230 cyclotron and specified the main parameters of the accelerator. Possible schema of the extraction system and preliminary results of beam dynamics simulations are presented. Codes and methods used for the beam tracking are shortly described.



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