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Simulation of a proton beam facility in the TOPAS MC software package 在TOPAS MC软件包中模拟质子束设施
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-02 DOI: 10.55959/msu0579-9392.78.2310201
G.V. Merzlikin, S.V. Akulinichev, I.A. Yakovlev
{"title":"Simulation of a proton beam facility in the TOPAS MC software package","authors":"G.V. Merzlikin, S.V. Akulinichev, I.A. Yakovlev","doi":"10.55959/msu0579-9392.78.2310201","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2310201","url":null,"abstract":"The aim of this work is to simulate the formation system of therapeutic proton beams at the accelerator of the Institute of Nuclear Research, Russian Academy of Sciences, using the TOPAS MC software package and to calculate, on this basis, the characteristics of irradiation of biological objects. As such characteristics, the dependence of the absorbed dose and linear energy transfer (LET) on the proton range in water and the effective dose of irradiation of HT-29 and HCT-116 cell lines used in real experiments are considered. Also, the uniformity of irradiation with a high dose rate of the studied biological objects was evaluated during the operation of the radiation unit in FLASH-therapy modes. The research is aimed at preparing and conducting radiobiological experiments with proton beams with a record dose rate.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136039532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Beam dynamics simulation in the linear accelerator used as an injector for the 4-th generation Specialized Synchrotron Radiation Source SSRS-4 第4代专用同步辐射源SSRS-4注入器直线加速器束流动力学模拟
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-02 DOI: 10.55959/msu0579-9392.78.2310401
I.A. Ashanin, Yu.D. Kluchevskaia, S.M. Polozovc, V.I. Rashchikov
{"title":"Beam dynamics simulation in the linear accelerator used as an injector for the 4-th generation Specialized Synchrotron Radiation Source SSRS-4","authors":"I.A. Ashanin, Yu.D. Kluchevskaia, S.M. Polozovc, V.I. Rashchikov","doi":"10.55959/msu0579-9392.78.2310401","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2310401","url":null,"abstract":"At present, a fourth-generation synchrotron radiation source USSR (Synchrotron & Laser), which will the one of the world’s largest scientific centers is being designed in Russia. Its creation will make it possible to carry out experiments to study the structures of a wide range of objects in various disciplines at a qualitatively new level compared to the previous generation of sources. The overall facility layout includes a 6 GeV main storage ring and a linear electron accelerator (linac) at full energy. It is proposed to use one linear accelerator with two RF guns. A RF gun with a photocathode can be used to generate a bunch train for a Free Electron Laser (FEL), a RF gun with a thermionic cathode can be used for injection into a storage ring. Both injectors will operate with the same regular part of the linear accelerator, consisting of 100-120 identical sections. The purposed transverse emittance in the main storage ring will be 50–100 pm.rad. The development of a general linear accelerator scheme in order to minimize the beam energy spread and the output transverse emittance, the optimization of the geometric and electrodynamics parameters of the accelerating structures, and the beam dynamics analysis in this linear accelerator will be discussed in the article. The beam dynamics simulation was performed using the BEAMDULAC code developed at the Department of Electrophysical Facilities of the National Research Nuclear University MEPhI.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136039110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nuclear physics in Russia is 100 years old 俄罗斯的核物理学已有100年的历史
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-02 DOI: 10.55959//msu0579-9392.78.2310101
A. P. Chernyaev, E.N. Lykova
{"title":"Nuclear physics in Russia is 100 years old","authors":"A. P. Chernyaev, E.N. Lykova","doi":"10.55959//msu0579-9392.78.2310101","DOIUrl":"https://doi.org/10.55959//msu0579-9392.78.2310101","url":null,"abstract":"This review gives the history of the development of nuclear physics since the 1920s. The most significant discoveries in nuclear physics and their introduction into the world economy are described. The analysis of the current state of the achievements of nuclear physics in the national economy of Russia and the prospects for their development in the future are carried out. The brightest nuclear projects in world and Russian science and technology are discussed.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136000713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Collisional quenching of the pionic helium 4He long-lived states 电子氦4He长寿命态的碰撞猝灭
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-02 DOI: 10.55959/msu0579-9392.78.2310602
A. V. Bibikov, G. Ya. Korenman, S. N. Yudin
{"title":"Collisional quenching of the pionic helium 4He long-lived states","authors":"A. V. Bibikov, G. Ya. Korenman, S. N. Yudin","doi":"10.55959/msu0579-9392.78.2310602","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2310602","url":null,"abstract":"Collisions of metastable pionic helium atoms with helium atoms of the medium lead to the destruction of these states, as well as to the shifts and broadening of E1 spectral lines of transitions between the pionic helium states. In the paper, in order to obtain the interaction potential matrix (π −He+)−He, calculations of the potential energy surface (PES) in the unrestricted Hartree-Fock method are performed taking into account electron correlations within the second-order perturbation theory (MP2). With this potential, the system of equations of strong channel coupling is solved numerically. Various techniques are used in the calculations that eliminate degeneracy of the solution matrix in the vicinity of small distances between colliding subsystems, which arises due to strong coupling of channels in this region, owing to which the numerical solutions “forget” boundary conditions. Cross sections and rates of collisional transitions are calculated (Nσv). It is found that the collisional transition rate (n, l) = (17, 16) → (17, 15) (n, l — the principal quantum number and the angular momentum respectively) for the density of the medium N = 0.2 × 1023 cm−3 is lower than 103s−1, which indicates that it is possible to ignore the effect of collisional destruction of pionic helium long-lived states in precision laser spectroscopic experiments.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136039106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Contacts for SiC nano-microwatt energy converters 碳化硅纳米微瓦能量转换器的触点
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-02 DOI: 10.55959/msu0579-9392.78.2310103
A. V. Gurskaya, M. V. Dolgopolov, S. A. Rajapov, V. I. Chepurnov
{"title":"Contacts for SiC nano-microwatt energy converters","authors":"A. V. Gurskaya, M. V. Dolgopolov, S. A. Rajapov, V. I. Chepurnov","doi":"10.55959/msu0579-9392.78.2310103","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2310103","url":null,"abstract":"The aim of this investigation is to consider the internal processes in the contact zone of the semiconductor with radionuclide microalloying: the diffusion of atoms during endotaxy, the diffusion of atoms after the decay of radionuclides, the formation of electrons and the material features arising from such diffusion. The DFT approach in this paper is aimed at obtaining evidence of the vacancy mechanism of diffusion. Radionuclide atoms diffuse into the growing layer of silicon carbide on silicon at the level of isoelement microalloying, forming, depending on the phase, effects that energetically manifest themselves as the effect of the «inner sun», which is the source of the spectrum of primary electrons and secondary electron-hole pairs at ionization losses. This is due to the interaction with the electrons of the shells of neighboring atoms, generating secondary electrons and holes in the region of spatial charge, carried by built-in electric fields.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136039533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Phase transition temperature in some lattice models 某些晶格模型的相变温度
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-02 DOI: 10.55959/msu0579-9392.78.2320101
A. O. Shishanin
{"title":"Phase transition temperature in some lattice models","authors":"A. O. Shishanin","doi":"10.55959/msu0579-9392.78.2320101","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2320101","url":null,"abstract":"A method for calculating the phase transition temperature using only one cell is considered. This method has been tested for various lattice models: Ising model on triangular, hexagonal and tetrahedral lattices, three-position Potts model on a square lattice. In particular, exact reply is reproduced in the Ising model for triangular lattice. Also, this method was used to analyze some multi-spin models.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136000817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Refinement of the motion model of the Linus satellite of the asteroid (22) Kalliope Kalliope小行星(22)的Linus卫星运动模型的改进
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-02 DOI: 10.55959/msu0579-9392.78.2320802
P. A. Budnikova, N. V. Emelyanov, B. S. Safonov
{"title":"Refinement of the motion model of the Linus satellite of the asteroid (22) Kalliope","authors":"P. A. Budnikova, N. V. Emelyanov, B. S. Safonov","doi":"10.55959/msu0579-9392.78.2320802","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2320802","url":null,"abstract":"The aim of this article is to analyze the dynamics of the Linus satellite of the asteroid (22) Kalliope. New results have been obtained, and now they are being published. New observations of the satellite were made at the Caucasus Mountain Observatory of the SAI from October 2021 to March 2022. The obtained astrometric results are presented in the article. Based on the updated set of observations, the parameters of the satellite’s orbit were re-determined. An increase in the accuracy of ephemeris with the addition of new observations is shown. A new attempt was made to determine the precession of the satellite’s orbit caused by the compression of a rapidly rotating asteroid. The goal was to determine the dynamic compression of the central body. The entire observation interval is divided into groups. From the observations of each group the position of the axis of the satellite’s orbit was found. Changing the position of the axis gives the desired precession. Studies on several examples show that the position of the axis from such groups of observations is determined very unreliably. The reason lies in the strong correlation between the determined parameters with limited observational accuracy. Ways of studying precession are outlined by joint determination of dynamic parameters on the basis of all available observations.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136000319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Radiation and transition losses in curved waveguides for Bloch surface waves 布洛赫表面波弯曲波导中的辐射和跃迁损耗
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-02 DOI: 10.55959/msu0579-9392.78.2320402
D. A. Shilkin, K. R. Safronov, A. D. Rozanov, V. O. Bessonov, A. A. Fedyanin
{"title":"Radiation and transition losses in curved waveguides for Bloch surface waves","authors":"D. A. Shilkin, K. R. Safronov, A. D. Rozanov, V. O. Bessonov, A. A. Fedyanin","doi":"10.55959/msu0579-9392.78.2320402","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2320402","url":null,"abstract":"One-dimensional photonic crystals that support the propagation of Bloch surface electromagnetic waves attract the interest of researchers as an alternative platform for integrated optics with potential applications in nanophotonics, sensing, and optical manipulation of micro- and nanoparticles. In this paper, we numerically study the properties of surface wave modes in curved waveguides on top of a one-dimensional photonic crystal. It is shown that, when the waveguide is bent, an additional channel of radiation losses appears, which is associated with light leakage from the surface wave mode into bulk modes of the photonic crystal, and the waveguide mode profile becomes asymmetric with respect to the middle of the waveguide. We also determine the conditions for minimizing transition losses, which occur at the junctions of waveguides with different curvatures, by transverse displacement of the waveguide facets relative to each other.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136001468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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