Physics of Particles and Nuclei Letters最新文献

We present the results of a quantitative study of inaccuracies in beam delivery by a proton therapy system, which were used to determine the planned amount of irradiation. A technique for measuring and analyzing the physical parameters of a proton beam is described. Calculated is the minimum deviation from the clinical treatment volume required to ensure its coverage with the prescribed dose, taking into account beam delivery errors by a proton therapy system; sufficiency of the calculated deviation is assessed. The results of the study make it possible to optimize the determination of the planned irradiation amount in proton therapy.

EVPU PS 140-8 current sources are used to power the correction magnets of the Booster accelerator. IT-M3900D-10-170 current sources are used to power the corrective lenses of collider rings. When operating at low currents with an inductive load (5 mH), current pulsations with an amplitude of 500 mA appear at the output of current sources, which interfere with the adjustment of the beam orbit. To solve the problem of current pulsations of IT-M3900D-10-170, an electronic unit has been developed that solves problems such as suppressing current pulsation, current polarity reversal, energy evacuation in the event of a corrective magnet leaving the superconductivity mode, and emergency shutdown in the case of overheating of transistor assemblies. To solve the problem of current pulsations for EVPU PS 140-8, an electronic device has been developed that is an assembly of high-power Schottky diodes.

Reasons for the increase of longitudinal emittance in Booster, which appeared in the fourth commissioning session, are considered, and an effective diagnostic method is proposed. Specific features of the proposed method and the hardware and software solutions used are analyzed.

Sextupole lenses used for chromatic aberration correction can excite nonlinear resonances that limit the dynamic aperture. It is also necessary to take into account the effect of betatron coupling excited by the solenoid of the cooling section. This paper presents the results of a study of the dynamic aperture of the booster synchrotron being developed at the Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences (BINP SB RAS). Optimal working points for different accelerator operating modes have been determined. Frequency map analysis has been performed to study the regularity of trajectories in the accelerator aperture.

The structure of an electron accelerator with a total energy of 6 GeV that provides various operation modes of a synchrotron storage ring and free-electron laser has been presented. The calculated parameters of accelerating system and simulation results have been presented, and suggested technical solutions have been substantiated.

In studying Z-pinch discharges under the effect of intense electron beams, one of the methods for increasing the beam current density in plasma is a pulse gas injection into the discharge tube. We studied the pulsed gas supply into the plasma discharge tube while continuously measuring the gas pressure using a fast-response ionization sensor. The technique developed makes it possible to synchronize filling the experimental volume with gas with injecting the electron beam into the plasma. It is now possible to input a beam with high current density if the electrons are injected before the gas front enters the transport channel, preventing beam scattering and increase in phase volume.

In cyclotron development, a large number of calculations are required for both individual accelerator systems and particle motion dynamics. Artificial intelligence (AI) can contribute to increasing the speed of calculations, optimizing the codes, and improving the quality of the results. The initial results of using machine learning (ML) for magnetic field formation are presented, and the potential applications of computer vision and AI prospects for optimizing beam motion are analyzed.

The power supply system of the magnets of the injection complex of the SRF “SKIF” includes about 70 DC sources, 3 pulse current generators, and about 100 AC sources. DC sources include five types of precision bipolar and unipolar sources with a maximum output current from 3 to 300 A and a maximum output voltage of 24 V. The maximum output current of pulse generators is from 1.5 to 10 kA, voltage up to 1 kV. AC sources include four types of sources with a maximum output current from 6 to 900 A and a maximum reactive power of 0.5 MW. For reliable operation of the injection complex, it is necessary to ensure the stability of the parameters of the current sources, high reliability of operation, and the fast replacement of failed current sources the sources of the same type. All these current sources have been developed and produced by the Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences.

The main objective of this work is the creation of a quadrupole lens (QL) based on permanent magnets (PMs) for the DC-140 cyclotron beam extraction system. We discuss the features of developing a method for the incoming inspection of PMs using mathematical models of a precision magnetic lens system. For the proposed QL design, the incoming inspection technique of PMs has been developed, and the devices and accessories required for this purpose have been manufactured. Three samples of QLs have been assembled: a technological prototype and main and control samples.

A two-switch version of the power supply circuit for the inflector plates of the Nuclotron Booster is considered. The circuit makes it possible to form rectangular pulses of the deflection field for multiple injection of ion beams. The results of testing the device on an equivalent load are presented.