Physics of Particles and Nuclei Letters 
This is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.
This is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.Automation of Physical Experiments on the Accelerating Neutron Source
This report provides an overview of the diagnostic tools used at the facility, such as determining the position and size of a beam of negative hydrogen ions using a wire scanner and video cameras, automating experiments on measuring the phase portrait of a proton beam with energies up to 2 MeV using a wire scanner, determining the position and the size of the proton beam on the surface of the lithium target using built-in thermocouples in real time, and automating measurements of the spatial distribution of the absorbed dose components in the water phantom. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - August 1, 2023 Category: Physics Source Type: research
Vacancy Determination in Single-Crystal Diamond Plates Using Positron Annihilation Spectroscopy
This article presents the results of an investigation into defects in synthetic monocrystalline diamond plates after electron irradiation. Data on defect concentration distribution in the infrared (IR) range are given. In addition to IR spectroscopy, positron annihilation spectroscopy (PAS) is used to study the vacancy defects in diamonds. It is shown that PAS using a monochromatic positron beam can be used for the nondestructive control of vacancy distribution along the depth of the diamond plate. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - August 1, 2023 Category: Physics Source Type: research
Main Part of Proton Therapy Linac
AbstractThe main part (MP) of a compact pulsed proton linac is designed to accelerate a beam with a pulsed current reaching 2.5 mA to an output energy controlled in the range from 60 to 230 MeV while maintaining small transverse beam dimensions. The traveling wave accelerating structure is used in theS-band frequency range. It provides a high accelerating rate and allows one to adjust the output energy of the bunches within the RF pulse. Particular attention is paid to the balance and reliability of the proposed solutions, accessibility and motivated feasibility of the MP elements. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - August 1, 2023 Category: Physics Source Type: research
Determining Time and Energy Parameters of the Electron Beam of a High-Current Pulse Gun
AbstractThe object of study is an electron gun with a desorption slit cathode and the Lewis pulse transformer at a voltage reaching 300 kV. The beam current and the input transformer voltage are measured in each pulse of the gun. By solving the equations describing the electrical circuit of the electron gun, spectral characteristics of the electron beam corresponding to the specific electrical parameters of the gun are obtained. Measurements using a magnetic spectrometer showed satisfactory agreement of the energy characteristics obtained during calculations and direct measurements. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - August 1, 2023 Category: Physics Source Type: research
Beam Injection into the Booster of the NICA Accelerating Complex
AbstractThe NICA accelerator complex includes two chains of linear injectors, a new superconducting Booster, the existing Nuclotron superconducting synchrotron, and a superconducting Collider consisting of two storage rings ≈503 m in circumference. At present, three commissioning runs have been carried out. One of the first operations during work with the beam is its injection and subsequent stable circulation. This paper describes algorithms for tuning a single single-turn injection and the results of the past three runs, as well as methods for optimizing tuning. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - August 1, 2023 Category: Physics Source Type: research
Tune Measurement System of the SKIF Booster
AbstractTune measurement system developed in Budker Institute of Nuclear Physics for the Booster of the SKIF project provides fast and accurate measurements of fractional part of betatron tunes during Booster acceleration cycle. Resonance excitation of betatron oscillations with help of radio frequency (RF) pulses feeding to the kiker electrodes is used in the system. The minimal tune measurement time is 1.3 ms, which allows having tunes measurement data for each phase of the Booster accelerating cycle. The system can perform up to 256 measurements during 400 ms time interval of Booster energy ramping. The tune measurement...
Source: Physics of Particles and Nuclei Letters - August 1, 2023 Category: Physics Source Type: research
Commissioning the First Free Electron Laser Based on a Variable-Period Undulator
This article describes the design of this undulator and presents the results of measurements of the radiation parameters. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - August 1, 2023 Category: Physics Source Type: research
Pulse Power Supply System for Solenoidal Lenses of Linear Induction Accelerator LIU-20
AbstractBudker Institute of Nuclear Physics of SB RAS has great experience in building power supplies used for accelerator applications where requirements for precise pulsing current are key features. The power supplies based on a capacitor discharge principle and typically with thyristors as switching element. The described power supply system consists of four charging units and a custom designed controller, it ensures the precision charging of the storage capacitors up to 1200 V of any polarity and switching it to the winding of the magnetic element. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - August 1, 2023 Category: Physics Source Type: research
Vacuum Insulated Tandem Accelerator for Boron Neutron Capture Therapy and Other Applications
AbstractA tandem electrostatic accelerator with an original design called a Vacuum Insulated Tandem Accelerator was proposed and developed at the Budker Institute of Nuclear Physics. Unlike conventional tandem accelerators, it does not use accelerating tubes —the high-voltage and intermediate electrodes are made in the form of nested cylinders and are fixed at a single feedthrough insulator. This design of the electrodes made it possible to provide a high rate of ion acceleration (up to 25 kV/cm). The accelerator is equipped with a set of diagnostic t ools that provide the long-term stable production of a beam of protons...
Source: Physics of Particles and Nuclei Letters - August 1, 2023 Category: Physics Source Type: research
Development of a 540 ° Magnetic Buncher Based on Permanent Magnets
Abstract—To obtain short electron bunches with a large charge, special magnetic systems with a strong dependence of the time of flight on the particle energy, so-called magnetic bunchers, are used. This paper considers one of the variants of such a system and describes its main elements: magnetic mirrors. Permanent magnets are used to simplify the design and increase the stability of the magnetic field. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - August 1, 2023 Category: Physics Source Type: research
Investigation into the Operation Modes of RF Systems of Booster –Nuclotron Synchrotrons in Optimizing the Capture and Acceleration of Carbon Ion Beams
AbstractThis paper describes experiments with the main parameters of the RF accelerating systems of the Booster and the Nuclotron of the Nuclotron based Ion Collider fAcility (NICA) complex, which affect the capture and acceleration, as well as the additional hardware solutions used in this case. The operating modes of accelerating stations of the Booster and the Nuclotron are considered. In particular, the paper describes the principle of formation of the law of the change in the amplitude of the accelerating voltage during the adiabatic capture of particles both in the Booster and in the Nuclotron, as well as the feature...
Source: Physics of Particles and Nuclei Letters - August 1, 2023 Category: Physics Source Type: research
Quantum Corrections to the Effective Potential in Generalized Models with a Scalar Field
AbstractA renormalization group (RG) equation for the effective potential is constructed in the approximation of leading logarithms, which is valid for an arbitrary scalar field theory in four dimensions. This equation reproduces the standard RG equation for the theory\({{\phi }^{4}}\), and it also allows one to study more complex scalar interaction potentials. In the general case, the resulting equation cannot be solved analytically, but it reduces to ordinary differential equations in some cases that can be studied numerically. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - June 1, 2023 Category: Physics Source Type: research
Spherically Symmetric Black Holes and Physical Vacuum
AbstractUsing the example of an action for an ideal fluid with a variable number of particles, a phenomenological description of the particle production processes against the background of strong external fields is explored. The conformal invariance of the part of the action associated with the particle creation law is shown. For spherically symmetric geometries, it is demonstrated that the physical vacuum for this model cannot be described by vacuum solutions of the black hole type both for general relativity and for some cases of quadratic gravity. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - June 1, 2023 Category: Physics Source Type: research
Sunrise Integral in Non-Relativistic QCD with Elliptics
AbstractThe main steps of the process of obtaining the result [1] in terms of elliptic polylogarithms for a two-loop sunrise integral with two different internal masses with pseudothreshold kinematics for all orders of the dimensional regulator are shown. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - June 1, 2023 Category: Physics Source Type: research
Dense QCD in Magnetic Field
AbstractWe discuss the magnetic field influence on the hot dense anisotropic QGP phase diagram, constructed holographically within the bottom-up approach [1, 2]. The talk was given by K. Rannu. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - June 1, 2023 Category: Physics Source Type: research
