bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and construction of 3D Helmholtz coil system to calibrate 3D Hall probes
Authors: Fontanet A. , Marcos J. , Ribó Ll. , Massana V. , Campmany J. 
Published: December 2019

Abstract
In this paper we present the design of a system of 3D Helmholtz coils aimed to generate a magnetic field in any direction in a controlled way. The system is intended to be applied to the detailed characterisation of the response of 3D Hall probes as a function of the orientation of the measured field. The system will generate magnetic fields of up to 5 mT with an expected angular precision of 0.2 mrad.
Dynamic pressure in the LHC: influence of ions induced by ionization of residual gas by both the proton beam and the electron cloud
Authors: Bilgen S. , Bruni C. , Mercier B. , Sattonnay G. , Baglin V. 
Published: December 2019

Abstract
For the future HL-LHC or FCC study, the understanding of the beam interactions with the vacuum chamber is fundamental to provide solutions to mitigate the pressure rises induced by electronic, photonic and ionic molecular desorption. The proton beam circulating in the LHC vacuum chamber ionizes the residual gas producing electrons as well as positive ions. In-situ measurements were carried out, on the LHC Vacuum Pilot Sector during the LHC RUN II, to monitor the dynamic pressure, and to collect the electrical signals due to the electron cloud and to the ions interacting with the vacuum chamber walls. Experimental measurements of electrical signals recorded by copper electrodes were compared to calculations taking into account both the Secondary Electron Yield of copper and electron energy distribution. Finally, it seems that copper electrodes were not fully conditioned and an ion current could be estimated.
Research and design of digital magnet power supply controller for HALS
Authors: Shao Z. X. , Gao H. , Zhang H.Y. , Liu P. , Liu G.W. , Sun X.K. 
Published: December 2019

Abstract
Hefei Advanced Light Source (HALS) is the fourth-generation radiation light source in China which is under design. Ultra-low beam emittance requires higher performance of power supply system. The power supply controller is a key part of the power system. This article describes the design and testing of high-stability power controllers and fast corrector power supply controllers. A new controller architecture is proposed for the problems of the two controllers.
Research progress of power supply system in HALS
Authors: Shao Z. X. , Gao H. , Zhang H.Y. , Liu P. , Liu G.W. , Wang L. 
Published: December 2019

Abstract
Hefei Advanced Light Source (HALS) is the fourth generation light source in China's planning and construction. In order to achieve the diffraction limit of the emission and improve the beam quality, the research on magnet power supply (MPS) technology is essential. We have designed a variety of solutions for different power supplies. We designed the first version of the high stability power supply control card. The first version of the high-stability power supply control card was designed and tested with a small power module. Our pre-research system has developed a corrector magnet power supply with a small signal response bandwidth higher than 10 kHz. The developed prototypes use self-developed controllers, and most of the test results can meet the requirements. This article describes the progress of the HALS power supply system.
Improvement the Bending Magnet Power Supply Performance for TPS Storage RING
Authors: Wang Bao-Sheng , Liu Kuo-Bin , Huang Chih-Hsien , Liu Chen-Yao , Huang Yong-Seng , Huang Jhao-Cyuan 
Published: December 2019

Abstract
In the TPS (Taiwan Photon Source) facility, current stability of the electron beam depends on the bending magnet power supply and an orbit FOFB system to compensate the magnetic field. Due to the output current stability of the bending magnet power supply drifts with temperature so the orbit FOFB system should be applied to fine tune magnetic field and the photon beam should circulate in storage ring. In this paper, to stabilize the temperature of regulation circuit’s temperature box of the bending magnet power supply, the long-term output current stability is improve from ± 50ppm to ± 10ppm, and orbit FOFB system substantially reduce the tune X of beam position, effectively increasing the beam current stability and quality. In the TPS (Taiwan Photon Source) facility, current stability of the electron beam depends on the bending magnet power supply and an orbit FOFB system to compensate the magnetic field. Due to the output current stability of the bending magnet power supply drifts with temperature so the orbit FOFB system should be applied to fine tune magnetic field and the photon beam should circulate in storage ring. In this paper, to stabilize the temperature of regulation circuit’s temperature box of the bending magnet power supply, the long-term output current stability is improve from ± 50ppm to ± 10ppm, and orbit FOFB system substantially reduce the tune X of beam position, effectively increasing the beam current stability and quality.
Further RF measurements on the superconducting 217 MHz CH demonstrator cavity for a CW linac at GSI
Authors: Dziuba F , Aulenbacher K , Barth W , Basten M , Burandt C , Busch M , Conrad T , Gettmann V , Heilmann M , Kürzeder T , Lauber S , List J , Miski-Oglu M , Podlech H , Salvatore J , Schnase A , Schwarz M , Yaramyshev S 
Published: December 2019

Abstract
Recently, the first section of a superconducting (SC) continuous wave (CW) linac has been extensively tested with heavy ion beam from the GSI High Charge State Injector (HLI). During this testing phase, the reliable operability of 217 MHz multi-gap crossbar-H-mode (CH) cavities has been successfully demonstrated. The SC 217 MHz CH cavity (CH-0) of the demonstrator setup accelerated heavy ions up to the design beam energy and even beyond at high beam intensities and full transmission. This worldwide first beam test with a SC CH cavity is a major milestone on the way realizing the entire SC CW linac project. In this contribution further RF measurements on the cavity are presented providing full characterization of the RF structure CH-0.
Low Power RF Test of a Quadrupole-free X-Band Mode Launcher for High Brightness Applications
Authors: Torrisi G. , Sorbello G. , Celona L. , Leonardi O. , Mauro G. , Gammino S. , Castorina G. , Spataro Bruno , Faillace L. , Dolgashev V. 
Published: December 2019

Abstract
In this work we present the low power RF characterization of a novel TM01 X-band mode launcher for the new generation of high brightness RF photo-injectors. The proposed mode launcher exploits a fourfold symmetry which minimizes both the dipole and the quadrupole fields in order to mitigate the emittance growth in the early stages of the acceleration process. Two identical aluminum mode launchers have been assembled and measured in back-to-back configurations for three different central waveguide lengths. From the back-to-back results we infer the performance of each mode launcher. The low power RF test, performed at the Istituto Nazionale di Fisica Nucleare Laboratori Nazionali del Sud (INFN-LNS), validate both the numerical simulations and the quality of fabrication. An oxygen-free high-conductivity copper version of the device is being manufactured for high power and ultra high vacuum tests that are planned to be conducted at SLAC.
Simulations of beam loading compensation in a wideband accelerating cavity using a circuit simulator including a LLRF feedback control
Authors: Tamura Fumihiko , Yamamoto Masanobu , Sugiyama Yasuyuki , Yoshii Masahito , Ohmori Chihiro , Shimada Taihei , Nomura Masahiro , Hasegawa Katsushi , Hara Keigo , Furusawa Masashi 
Published: December 2019

Abstract
Magnetic alloy cavities are employed in the J-PARC RCS to generate high accelerating voltages. The cavity, which is driven by a vacuum tube amplifier, has a wideband frequency response and the beam loading in the cavity is multiharmonic. Therefore, the tube must generate a multiharmonic output current. An LTspice circuit model is developed to analyze the vacuum tube operation and the compensation of the multiharmonic beam loading. The model includes the cavity, tube amplifier, beam current, and LLRF feedback control. The feedback control consists of the I/Q demodulator including low pass filters, PI control, and I/Q modulator. In this article, we present the implementation of the LLRF functions in the LTspice simulations. The preliminary simulation results are also presented. The simulations fairly agree with the beam test results.
Monte Carlo modelling of particle acceleration in collisionless shocks with effective mean electric field
Authors: Osipov S M , Bykov A M , Ellison D C 
Published: December 2019

Abstract
Relativistic particle acceleration in collisionless shocks of supernova remnants is accompanied with magnetic field amplification by cosmic ray (CR) driven plasma instabilities. Bell’s fast CR-current instability is predicted to produce turbulence with a non-zero mean electric field in the shock precursor. We present a Monte Carlo model of Fermi shock acceleration explicitly taking into account an effective mean upstream electric field. Our model is nonlinear and includes the backreaction effects of efficient Fermi acceleration on the shock structure.
Modelling of far ultraviolet emission of pulsar wind nebulae with bow shocks
Authors: Petrov A E , Bykov A M , Osipov S M , Levenfish K P , Uvarov Yu A 
Published: December 2019

Abstract
The kinetic modelling of electron and positron acceleration in the colliding shock flows of pulsar wind nebulae with bow shocks allows to explain the nature of their hard particle spectra. The hard synchrotron emission produced by the accelerated particles can reach the far ultraviolet range (1250 — 2000 Å) providing the maximal luminosity of the bow shock nebulae in this range. In this paper the results of modelling of pulsar wind particles transport in the colliding shock flows in the bow shock nebulae of PSRs J1741-2054 and B1929+10 are presented. The results of the synchrotron emission modelling are confronted to the observations in order to estimate possible far ultraviolet luminosities of the discussed objects.
Differential rotation of the neutron star polar cap
Authors: Vorontsov M V , Barsukov D P 
Published: December 2019

Abstract
The flow in the polar cap region of the neutron star is caused by magnetospheric electric current flow in the pulsar tube due to current closure in the crust and partially in the liquid surface layer. In this paper we consider the flow velocity in case of aligned pulsar with homogeneous vertical magnetic field. Changing of the liquid density and the conductivity with depth is taken into account.
Chemical evolution of cold dark clouds in the vicinity of supernova remnants
Authors: Nesterenok A V 
Published: December 2019

Abstract
The supernova explosion increases cosmic ray and x-ray fluxes in the surrounding interstellar medium. Cosmic ray particles and x-ray radiation penetrate nearby molecular clouds and affect the chemical and thermal evolution of the gas. Here we study chemical changes in the dense molecular gas influenced by a sudden increase of the ionization rate that may be caused by the supernova explosion. At the cloud core density 2 × 104 cm−3, the H atom abundance reaches the equilibrium value at about 3 × 104 yr after the change in irradiation conditions. The response time of abundances of icy mantle species is 104 − 105 yr. The abundances of neutral and grain mantle species may not reach their equilibrium values in molecular clouds in the vicinity of’middle-aged’ supernova remnants.
Interaction of a supernova remnant with a wind of young massive star: MHD simulations
Authors: Badmaev D V , Bykov A M 
Published: December 2019

Abstract
Fast stellar winds of young massive stars and supernovae play an essential role in the evolution of the interstellar medium in the Milky Way. They dominate the dynamics of the active starforming regions in starburst galaxies and in particularly their non-thermal radiation. The non-thermal emission from starburst galaxies NGC 253, M82, NGC 1068 was detected from radio to gamma-rays. To model the observed radiation, one needs to know the complex structure of the flows and magnetic fields in the starforming regions. In this work a 2.5D magnetohydrodynamic (MHD) simulation (i.e., we consider 3D vector fields, but assume a 2D axisymmetric geometry) of the interaction between a stellar wind and a supernova remnant shock wave is carried out using the MHD module of the code PLUTO. The structure of the flows in the collision region is obtained taking into account the magnetic fields of the rotating source stars. We present the profiles of the bulk plasma velocity, density and magnetic field in the collision region. The amplification of regular magnetic fields in such systems is studied.
Konus-UF and Helicon-I gamma-ray burst experiments
Authors: Ulanov M V , Aptekar R L , Golenetskii S V , Frederiks D D , Svinkin D S , Tsvetkova A E 
Published: December 2019

Abstract
We present Konus-UF and Helicon-I, the future space-based experiments designed to study temporal and spectral characteristics of gamma-ray bursts, solar flares, soft gamma-repeater bursts, and other transient phenomena over a wide energy range from 10 keV to 15 MeV. The instruments will be mounted onboard the World Space Observatory–Ultraviolet (WSO-UV) and the InterhelioProbe spacecraft, respectively. The spacecraft orbits are going to be far from the Earth’s magnetosphere, which enables nearly uninterrupted observations of the entire sky under stable background conditions.
Clustering local laws of the dynamics of complex living systems
Authors: Demin S A , Panischev O Yu , Latypov R R 
Published: December 2019

Abstract
In this paper, we generalize the studies of the local laws clustering for dynamics of non-Hamiltonian live systems. We analyze the human heart-rate variability. We use the localization procedure to extract the local properties about the space-time structure of the R–R interval time series. The window-time behavior of the memory functions power spectra reflects the periodic properties in studied dynamics. The age-related alterations in heart-rate variability for young and old testees are manifested in velocity of relaxation. They may be derived by localizing the kinetic and relaxation parameters. These parameters can be considered as the specific predictors of the dynamic intermittency in the initial time signal. The proposed window-time representation of the spectral characteristics, kinetic and relaxation parameters is useful for medical physics and physics of live systems.
FTIR Study of the Secondary Structure of DNA in Complexes with Platinum Coordination Compounds
Authors: Tymchenko E , Glova V , Soldatova A , Chikhirzhina E , Polyanichko A 
Published: December 2019

Abstract
Mechanisms of interaction between antitumor compounds and biological molecules have been being studied for decades. One of the most widely applicable drug is dichlorodiammineplatinum(II) (DDP). In the present work we have analyzed effect of cis- and trans-DDP on secondary structure of DNA, bovine serum albumins and HMGB proteins using FTIR spectroscopy. We have shown that both of the DDP isomers facilitate the formation of albumin dimers. We have also shown that DDP facilitates changes in DNA structure, attributed to DDP binding to DNA bases and DNA cross-linking. Thus, the application of hidden peak analysis of FTIR spectra shown to be informative to structural investigation of DDP complexes with nucleic acids and proteins.
Analysis of the secondary structure of blood serum proteins from patients with multiple myeloma
Authors: Kobeleva M O , Telnaya E A , Plotnikova L V , Garifullin A D , Kuvshinov A Yu , Voloshin S V , Polyanichko A M 
Published: December 2019

Abstract
Infrared spectroscopy of biomolecules is one of the few methods, which combine a relatively simple measurements and a possibility of highly informative structural analysis. The most high-demand field of such investigations is the identification of various pathologies accompanied by changes in the biomolecular structure. In this study the comparative analysis of the secondary structure of blood serum proteins from patients with multiple myeloma and healthy donors was performed using infrared spectroscopy. There is a tendency for reduce the proportion of α-helices in the secondary structure of blood serum proteins in patients with multiple myeloma compared to healthy donors. Thus, infrared spectroscopy reveals difference in the secondary structure of blood serum proteins in patients with multiple myeloma and healthy donors.
Compact static mass spectrometer for medical diagnostics
Authors: Kuleshov D O , Kogan V T , Chichagov Yu V , Bogdanov A A , Antonov A S , Tubol’tsev Yu V , Aruev N N 
Published: December 2019

Abstract
Static mass spectrometer for detecting pathologies in the human organism from to the composition of exhaled air is described in this paper. The instrument is equipped with the capillary and membrane sample intake systems for dynamic investigations of a number of components in the exhaled mixture as well as for determining trace amounts of specific volatile biomarkers accompanying diseases of the respiratory system, blood circulation system, interstitial tract, and endocrine system. Tests of the mass spectrometer with the membrane sample inlet system have shown for one of the markers that the monitoring of acetone vapor in air during the respiratory process can be carried out at a level of ∼1 ppm. Mass spectrometric detection of a number of other markers with a higher (up to two orders of magnitude) penetrability through the membrane as compared to acetone becomes possible at the ppb level. The presented static mass spectrometer was tested for the possibility of working with a linear Ion CCD matrix designed to directly register ions in a wide energy range. The experimental results prove that the selected scheme of the mass spectrometer can be used in combination with both the IonCCD detector and the microchannel plate – IonCCD detector without significantly deteriorating the main performance characteristics of the instrument.
Development of a new technique for quantitative PCR analysis
Authors: Belov D A , Belov Yu V , Kurochkin V E 
Published: December 2019

Abstract
A new technique for automatic determination of the quantification cycle value Cq
is proposed. The technique is based on the third-degree polynomial with a limited range of approximation, which is determined automatically. A reduction in the random error of constructing the calibration dependence in quantitative analyzes of genetically modified soy has been achieved in comparison with the well-known ANK_Shell software of the nucleic acid analyzers ANK.
Influence of lighting spectral characteristics on the lettuce leaf optical properties
Authors: Kuleshova T E , Chernousov I N , Udalova O R , Khomyakov Y V , Aleksandrov A V , Seredin I S , Shcheglov S A , Gall N R , Panova G G 
Published: December 2019

Abstract
The paper concerns the efficiency of light absorption with different spectral composition by lettuce leaves, and the optimal conditions of light environment and mineral nutrition to increase the productivity and quality of plant products grown under artificial lighting. The greatest positive effect has been achieved on the productivity and quality of the lettuce plants Typhoon variety when been grown on the 1N Knop nutrient solution and illuminated with quasi-continuous spectrum in a limited wavelength range in the yellow area with addition of ∼ 10-20% of the total photosynthetically active radiation (PAR) in the near infrared. The most efficient conditions results in the increase on amount of absorbed photon energy by ∼ 40% per gram of plant leaf surface over 10 days when rapid biomass growth and plant development take place. It is proposed to use the index of light absorption, describing the absorption increment with biomass growth, as an indicator for the intensity of light energy processing into biomass.
Microwave Tunable Devices on the YIG-VO2 structures
Authors: Nikitin A A , Vitko V V , Nikitin A A , Ustinov A B , Kalinikos B A 
Published: December 2019

Abstract
The theory describing a tunability of the spin-wave spectrum for the ferrite/vanadium dioxide layered structures through changing the VO2 conductivity is suggested. An influence of the various parameters on the spin-wave wavenumber variations and damping decrement is studied. We show that an effective wavenumber variation with minimal losses is achieved by matching the thicknesses of the ferrite and vanadium dioxide films, as well as the value of external magnetic field. We show also that owing to the electrodynamic interaction, a quality of contact between the ferrite and vanadium dioxide layers is not critical.
Investigation of local ion-stimulated carbon deposition to create vacuum field emission diodes
Authors: Panchenko I V , Shandyba N A , Kolomiytsev A S , Lisitsyn S A 
Published: December 2019

Abstract
This paper presents the results of experimental studies of the influence of the technological parameters of a focused ion beam (FIB) on the process of local ion-stimulated deposition of carbon and tungsten when creating elements of vacuum nanoelectronics. The dependences are obtained illustrating the influence of the time of the FIB exposure at a point on the geometric parameters of the structures. Experimental samples of vacuum field-emission diodes based on semiconductor-metal-dielectric structures were fabricated by ion-stimulated carbon deposition. A technological process for creating field-emission diodes has been developed. The prospects of applying the FIB method for creating structures of vacuum field emission nanoelectronics are demonstrated.
About the microwave excitation signal formation in the quantum frequency standard on cesium atoms – 133
Authors: Petrov A A , Davydov V V , Shapovalov D V 
Published: December 2019

Abstract
The features of microwave excitation signal formation in the quantum frequency standard on cesium atoms - 133 were determined. To improve the characteristics of microwave excitation signal, a new method for its formation has been proposed taking into account the features we have identified. Studies have shown that the use of this method allow to improving the spectral characteristics and reducing the step of tuning of microwave excitation signal. The obtained experimental results allowed establishing that the use of this method improves the stability of the output signal of the quantum frequency standard on 20%. The features we have identified allow us to expand the possibilities of research aimed at developing new methods and techniques for improving the characteristics of the microwave excitation signal and characteristics of quantum frequency standard output signal.
Features of the transmission of microwave signals in the range of 8–12 GHz in the maritime radar station over fiber-optic communication line
Authors: Fadeenko V B , Pchelkin G A , Davydov V V , Rud’ V Yu 
Published: December 2019

Abstract
The presented work demonstrates a new design of a fiber-optic line of microwave signal transmission for the receiving path of the maritime radar station. The features of microwave signals transmission in the maritime radar station are established. New designs of the transmitting and receiving modules have been developed in view of the established features. The transmitting module is based on the Mach-Zehnder electro-optical modulator. The receiving module contains p-i-n diode that is based on heterostructures. The results of experimental studies are presented.