
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.
2019 

P9201935 (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.

P13201924 (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 highflux pulsed neutron source,
which is foreseen to replace the IBR2M 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 nonmultiplying 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.

E1201921 (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 n_{c} (n_{c} > 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.

P16201916 (329.957)
Mokrov Yu. V., Morozova S. V.
The Correction of Albedo Dosimeters DVGN01 Readout at the Neutron Generator EG5 with the Help of a Spherical Albedo System
The results of readout correction for albedo dosimeters DVGN01 using a spherical albedo system are presented.
The measurements were carried out behind the neutron generator EG5. On the basis of the presented results,
the correction coefficients were recommended for individual radiation control at the neutron generator.

P1120199 (86.985)
Amirkhanov I. V., Sarker N. R., Sarkhadov I.
About One Method of ApproximateAnalytical Solution of the
QuantumMechanical ThreeBody Problem
A method is proposed for investigating the solutions of a single
quantummechanical threebody 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 twobody problem has an exact solution. The
solution of the original threebody problem is represented as an expansion
in the solutions of the twobody 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 twobody problem are calculated
analytically, the eigenvalues of the threebody 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.

P320198 (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
IBR2M currently in operation after its wearout, 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.

E920194 (170.120)
Sumbaev A. P., Barnyakov A. Yu., Levichev A. E.
On the Limits for the Accelerated Beam Current
in the LUE200 Linac of the IREN Fañility
The beam current loading of the accelerating fields is discussed for the
linear accelerator LUE200 of the IREN facility (a neutron source at the Frank
Laboratory of Neutron Physics, JINR). The LUE200 electron linac consists of
two disk loaded traveling wave accelerating structures with the operating
frequency of 2856 MHz and SLEDtype 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.

E920192 (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 medicobiological 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.



up

