Pub Date : 2024-04-01DOI: 10.3103/s0027134924700012
N. G. Chechenin, N. V. Novikov, A. A. Shirokova
Abstract
An analysis of the impact of high-energy cosmic radiation protons on the onboard electronics of the spacecraft was performed. It has been shown that protons can cause nuclear reactions with the atomic nuclei of electronics material. Residual nuclei formed as a result of a nuclear reaction have sufficiently high energy to cross the sensitive areas of several bits of electronics, and the high ionizing ability of nuclear fragments makes it possible to generate an excess charge of carriers that exceeds the critical charge for upsets to occur simultaneously in several bits of an electronic device.
{"title":"Multibit Upsets of Onboard Spacecraft Electronics from a Single Cosmic Radiation Particle","authors":"N. G. Chechenin, N. V. Novikov, A. A. Shirokova","doi":"10.3103/s0027134924700012","DOIUrl":"https://doi.org/10.3103/s0027134924700012","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>An analysis of the impact of high-energy cosmic radiation protons on the onboard electronics of the spacecraft was performed. It has been shown that protons can cause nuclear reactions with the atomic nuclei of electronics material. Residual nuclei formed as a result of a nuclear reaction have sufficiently high energy to cross the sensitive areas of several bits of electronics, and the high ionizing ability of nuclear fragments makes it possible to generate an excess charge of carriers that exceeds the critical charge for upsets to occur simultaneously in several bits of an electronic device.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140597806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-01DOI: 10.3103/s0027134924700024
M. P. Zarubin, A. F. Nizamieva, S. I. Alexeev, S. V. Mitrofanov, Y. E. Gorshkova, E. V. Kravchenko
Abstract
The unique protein Dsup of the tardigrade Ramazzottius varieornatus increases resistance to radiation and oxidative stress in various organisms and in human cell culture. According to simulation data, Dsup forms a complex with DNA with an intermolecular distance of ({sim}4) Å, as a result of which DNA is less damaged by reactive oxygen species generated during radiation exposure. However, the stability of the Dsup protein itself under the effect of ionizing radiation remains unclear, which is important for assessing its radioprotective potential and understanding the molecular mechanisms of action of this protein under conditions of high doses of radiation. In this work, the radiation degradation of the Dsup protein after irradiation with (gamma)-quanta using small-angle X-ray scattering (SAXS) and electrophoresis of proteins in polyacrylamide gel under denaturing conditions (SDS-PAGE) was studied for the first time. It was shown that, unlike the control protein bovine serum albumin, the spatial-structural characteristics of the Dsup protein remain almost unchanged even when exposed high doses of radiation (5 and 10 kGy), which indicates its high radiation stability.
{"title":"Radioprotective Protein of Tardigrades Dsup (Damage Suppressor) is Resistant to High Doses of Ionizing Radiation","authors":"M. P. Zarubin, A. F. Nizamieva, S. I. Alexeev, S. V. Mitrofanov, Y. E. Gorshkova, E. V. Kravchenko","doi":"10.3103/s0027134924700024","DOIUrl":"https://doi.org/10.3103/s0027134924700024","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The unique protein Dsup of the tardigrade <i>Ramazzottius varieornatus</i> increases resistance to radiation and oxidative stress in various organisms and in human cell culture. According to simulation data, Dsup forms a complex with DNA with an intermolecular distance of <span>({sim}4)</span> Å, as a result of which DNA is less damaged by reactive oxygen species generated during radiation exposure. However, the stability of the Dsup protein itself under the effect of ionizing radiation remains unclear, which is important for assessing its radioprotective potential and understanding the molecular mechanisms of action of this protein under conditions of high doses of radiation. In this work, the radiation degradation of the Dsup protein after irradiation with <span>(gamma)</span>-quanta using small-angle X-ray scattering (SAXS) and electrophoresis of proteins in polyacrylamide gel under denaturing conditions (SDS-PAGE) was studied for the first time. It was shown that, unlike the control protein bovine serum albumin, the spatial-structural characteristics of the Dsup protein remain almost unchanged even when exposed high doses of radiation (5 and 10 kGy), which indicates its high radiation stability.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140597782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-01DOI: 10.3103/s0027134924700164
E. Yu. Zarubina, M. A. Rogozhina, I. A. Chugrov
Abstract
An indirect-drive cryogenic target is necessary for research in the field of laser thermonuclear fusion at a megajoule energy level facility. Solid fuel layer in the target must meet high requirements: a roughness of the inner cryolayer surface must be less than 1 (mu)m, deviations from the sphericity and the concentricity must be less than 1(%). This paper describes the results of the research on meeting these requirements, notably, cryolayer formation and its characterization. Due to the slow crystallization method of the deuterium layer with its simultaneous heating by IR radiation, it is possible to obtain deviations from the sphericity and the concentricity of the inner cryolayer surface within limits of 2(%), the roughness, within limits of 20 (mu)m. Theoretical thermal calculations of the target construction are compared with experiment. The program system was developed using the optical shadow method which makes it possible to measure liquid fuel when filling the shell during the performance of the experiment, to perform the characterization of the solid cryogenic layer parameters, and to evaluate characterization results robustness.
{"title":"Creation of the Indirect-Drive Cryogenic Target with the Solid Deuterium Layer","authors":"E. Yu. Zarubina, M. A. Rogozhina, I. A. Chugrov","doi":"10.3103/s0027134924700164","DOIUrl":"https://doi.org/10.3103/s0027134924700164","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>An indirect-drive cryogenic target is necessary for research in the field of laser thermonuclear fusion at a megajoule energy level facility. Solid fuel layer in the target must meet high requirements: a roughness of the inner cryolayer surface must be less than 1 <span>(mu)</span>m, deviations from the sphericity and the concentricity must be less than 1<span>(%)</span>. This paper describes the results of the research on meeting these requirements, notably, cryolayer formation and its characterization. Due to the slow crystallization method of the deuterium layer with its simultaneous heating by IR radiation, it is possible to obtain deviations from the sphericity and the concentricity of the inner cryolayer surface within limits of 2<span>(%)</span>, the roughness, within limits of 20 <span>(mu)</span>m. Theoretical thermal calculations of the target construction are compared with experiment. The program system was developed using the optical shadow method which makes it possible to measure liquid fuel when filling the shell during the performance of the experiment, to perform the characterization of the solid cryogenic layer parameters, and to evaluate characterization results robustness.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140597805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-01DOI: 10.3103/s0027134924700140
S. S. Belyshev, V. V. Varlamov, L. Z. Dzhilavyan, A. A. Kuznetsov, A. M. Lapik, A. L. Polonski, A. V. Rusakov, V. I. Shvedunov
Abstract
Proposed as initial activation experiments for photonuclear research with (gamma)-quanta at energies (E_{gamma}leq 40) MeV are those using a source of backward Compton scattered laser radiation on accelerated electrons, which is currently under development. These experiments are crucial both for refining the techniques of tuning and monitoring such (gamma)-beams, and for investigating the excitation of pygmy and giant resonances in nuclei at (E_{gamma}) near the threshold of the ((gamma,n)) reactions, as well as the multiplicity of photoneutrons during the de-excitation of E1 giant resonances at (E_{gamma}) above the threshold of the ((gamma,2n)) reactions.
{"title":"On Activation Studies of Photonuclear Reactions on $${gamma}$$ -Beams from Backward Compton Scattering at $$boldsymbol{E}_{{gamma}}boldsymbol{leq 40}$$ MeV","authors":"S. S. Belyshev, V. V. Varlamov, L. Z. Dzhilavyan, A. A. Kuznetsov, A. M. Lapik, A. L. Polonski, A. V. Rusakov, V. I. Shvedunov","doi":"10.3103/s0027134924700140","DOIUrl":"https://doi.org/10.3103/s0027134924700140","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Proposed as initial activation experiments for photonuclear research with <span>(gamma)</span>-quanta at energies <span>(E_{gamma}leq 40)</span> MeV are those using a source of backward Compton scattered laser radiation on accelerated electrons, which is currently under development. These experiments are crucial both for refining the techniques of tuning and monitoring such <span>(gamma)</span>-beams, and for investigating the excitation of pygmy and giant resonances in nuclei at <span>(E_{gamma})</span> near the threshold of the (<span>(gamma,n)</span>) reactions, as well as the multiplicity of photoneutrons during the de-excitation of E1 giant resonances at <span>(E_{gamma})</span> above the threshold of the (<span>(gamma,2n)</span>) reactions.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140597690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-01DOI: 10.3103/s0027134924700097
S. G. Zheltoukhov, A. M. Tatarnikov, A. A. Belyakova, E. A. Koksharova
Abstract
This paper presents a prototype of an infrared photometer, created at the Sternberg Astronomical Institute, Lomonosov Moscow State University (SAI MSU), based on the commercial infrared module Gavin-615A. The operating spectral range of the photometer is 3–5 (mu)m. Investigations of the photometer’s detector have shown that its parameters coincide with those stated by the manufacturer. The nonlinearity of the detector does not exceed ({sim}5%) across the entire signal range, and coefficients for correction functions were determined. Additionally, we determined the readout noise (textrm{RN}=1200pm 210e^{-}), the conversion coefficient (textrm{GAIN}=520pm 9e^{-}/)ADU, the signal magnitude of the bias frame (textrm{BIAS}=960.5pm 2.2) ADU, and the dark current ({approx}(9.3pm 1.1)times 10^{6}e^{-})/s, which is the sum of the detector’s dark current and the radiation from the entrance window of the detector module. The value of dark current was measured at a window temperature of (6^{circ})C. Observations commenced with the photometer at the 2.5-m telescope of the Caucasian Mountain Observatory of MSU, with the first results presented in this paper. The unvignetted field of view was (30^{primeprime}). In the (M) band under good atmospheric conditions, an image quality close to the diffraction limit was achieved. Images of a star with brightness (L=7.96) and (M=6.78) were obtained over the 20-s exposure time and a (textrm{SNR}sim 10) ratio. It is shown that at high image quality with (textrm{SNR}=3) and exposure of 20 s it is possible to observe stars up to (Lsim) 9({}^{m}) and (Msim 8^{m}). The main module of the photometer was also used in measurements of the sky background brightness.
{"title":"New Infrared Camera of the Caucasian Mountain Observatory of the SAI MSU: Design, Main Parameters, and First Light","authors":"S. G. Zheltoukhov, A. M. Tatarnikov, A. A. Belyakova, E. A. Koksharova","doi":"10.3103/s0027134924700097","DOIUrl":"https://doi.org/10.3103/s0027134924700097","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This paper presents a prototype of an infrared photometer, created at the Sternberg Astronomical Institute, Lomonosov Moscow State University (SAI MSU), based on the commercial infrared module Gavin-615A. The operating spectral range of the photometer is 3–5 <span>(mu)</span>m. Investigations of the photometer’s detector have shown that its parameters coincide with those stated by the manufacturer. The nonlinearity of the detector does not exceed <span>({sim}5%)</span> across the entire signal range, and coefficients for correction functions were determined. Additionally, we determined the readout noise <span>(textrm{RN}=1200pm 210e^{-})</span>, the conversion coefficient <span>(textrm{GAIN}=520pm 9e^{-}/)</span>ADU, the signal magnitude of the bias frame <span>(textrm{BIAS}=960.5pm 2.2)</span> ADU, and the dark current <span>({approx}(9.3pm 1.1)times 10^{6}e^{-})</span>/s, which is the sum of the detector’s dark current and the radiation from the entrance window of the detector module. The value of dark current was measured at a window temperature of <span>(6^{circ})</span>C. Observations commenced with the photometer at the 2.5-m telescope of the Caucasian Mountain Observatory of MSU, with the first results presented in this paper. The unvignetted field of view was <span>(30^{primeprime})</span>. In the <span>(M)</span> band under good atmospheric conditions, an image quality close to the diffraction limit was achieved. Images of a star with brightness <span>(L=7.96)</span> and <span>(M=6.78)</span> were obtained over the 20-s exposure time and a <span>(textrm{SNR}sim 10)</span> ratio. It is shown that at high image quality with <span>(textrm{SNR}=3)</span> and exposure of 20 s it is possible to observe stars up to <span>(Lsim)</span> 9<span>({}^{m})</span> and <span>(Msim 8^{m})</span>. The main module of the photometer was also used in measurements of the sky background brightness.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140597784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-01DOI: 10.3103/s0027134924700061
G. V. Nibudin, I. I. Tsiniaikin, G. V. Presnova, M. Yu. Rubtsova, A. A. Popov, P. O. Mikhailov, A. S. Trifonov, O. V. Snigirev, V. A. Krupenin, D. E. Presnov
Abstract
In this work, an automatic thermoregulation system for biosensors based on field-effect transistors with a nanowire channel is demonstrated, providing full control and maintenance of the required temperature regime in bioanalytical analyses. The system elements, including field-effect transistors with a nanowire channel, temperature sensors, and heaters, were fabricated on a single silicon crystal using electron beam lithography, reactive ion etching, and high-vacuum deposition techniques. Unique electronics for temperature control and maintenance were developed. The dependence of thermometer readout on heating power was measured, which is in good agreement with the results of numerical simulation. A demonstration of a thermoregulation system with PID-feedback, ensuring the establishment of a desired temperature in the range from 30 to 70({}^{circ})C within 18 s in a liquid medium, was carried out. A demonstration of a thermoregulation system for detecting nucleic acids was performed using synthetic single-stranded DNA, representing a gene fragment from the bacterium Escherichia coli. The minimum detectable response was observed for a sample with a concentration of 3 fM.
{"title":"Thermoregulation System for Biosensors Based on Field-Effect Transistors with a Nanowire Channel","authors":"G. V. Nibudin, I. I. Tsiniaikin, G. V. Presnova, M. Yu. Rubtsova, A. A. Popov, P. O. Mikhailov, A. S. Trifonov, O. V. Snigirev, V. A. Krupenin, D. E. Presnov","doi":"10.3103/s0027134924700061","DOIUrl":"https://doi.org/10.3103/s0027134924700061","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In this work, an automatic thermoregulation system for biosensors based on field-effect transistors with a nanowire channel is demonstrated, providing full control and maintenance of the required temperature regime in bioanalytical analyses. The system elements, including field-effect transistors with a nanowire channel, temperature sensors, and heaters, were fabricated on a single silicon crystal using electron beam lithography, reactive ion etching, and high-vacuum deposition techniques. Unique electronics for temperature control and maintenance were developed. The dependence of thermometer readout on heating power was measured, which is in good agreement with the results of numerical simulation. A demonstration of a thermoregulation system with PID-feedback, ensuring the establishment of a desired temperature in the range from 30 to 70<span>({}^{circ})</span>C within 18 s in a liquid medium, was carried out. A demonstration of a thermoregulation system for detecting nucleic acids was performed using synthetic single-stranded DNA, representing a gene fragment from the bacterium <i>Escherichia coli</i>. The minimum detectable response was observed for a sample with a concentration of 3 fM.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140597699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-01DOI: 10.3103/s0027134924700152
M. Yu. Reshetnyak
Abstract
As demonstrated by a three-dimensional geodynamo model, during reversals and excursions of the geomagnetic field, with small amplitudes of heat sources, there occurs attenuation not only of the dipolar magnetic field but also of the high harmonic field. In this scenario, the Earth’s magnetosphere can be significantly smaller than previously expected, and correspondingly, the amount of radiation that penetrates the Earth could be greater.
{"title":"Behaviour of the Geomagnetic Field during Reversals and Excursions","authors":"M. Yu. Reshetnyak","doi":"10.3103/s0027134924700152","DOIUrl":"https://doi.org/10.3103/s0027134924700152","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>As demonstrated by a three-dimensional geodynamo model, during reversals and excursions of the geomagnetic field, with small amplitudes of heat sources, there occurs attenuation not only of the dipolar magnetic field but also of the high harmonic field. In this scenario, the Earth’s magnetosphere can be significantly smaller than previously expected, and correspondingly, the amount of radiation that penetrates the Earth could be greater.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140597790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-01DOI: 10.3103/s0027134924700127
M. A. Bogdanova, D. G. Voloshin, A. V. Glotov, D. V. Lopaev, N. N. Sysoev, D. R. Shibanov
Abstract
The spatio-temporal dynamics of plasma in a symmetrical dual-frequency 81 MHz/1.76 MHz capacitive discharge under the influence of a low-frequency 1.76 MHz field has been studied. Using phase-resolved optical emission spectroscopy, the dynamics of argon and xenon emission intensity in the plasma was obtained. Measurements of the electron energy probability function (EEPF) at the center of the discharge were performed using a Langmuir probe, and electron density measurements were made using a hairpin probe. The main result is the dynamics of the intensity ratios of selected argon and xenon lines under different conditions: at pressures of 40, 200, and 400 mTorr, low-frequency voltage amplitudes of 100, 200, and 400 V, and input power at 81 MHz of 3 and 15 W. The dynamics of high-energy electrons was investigated based on a two-temperature approximation of the electron energy probability function.
{"title":"Dynamics of Plasma in a Dual-Frequency Capacitive Discharge in an Ar/Xe Mixture","authors":"M. A. Bogdanova, D. G. Voloshin, A. V. Glotov, D. V. Lopaev, N. N. Sysoev, D. R. Shibanov","doi":"10.3103/s0027134924700127","DOIUrl":"https://doi.org/10.3103/s0027134924700127","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The spatio-temporal dynamics of plasma in a symmetrical dual-frequency 81 MHz/1.76 MHz capacitive discharge under the influence of a low-frequency 1.76 MHz field has been studied. Using phase-resolved optical emission spectroscopy, the dynamics of argon and xenon emission intensity in the plasma was obtained. Measurements of the electron energy probability function (EEPF) at the center of the discharge were performed using a Langmuir probe, and electron density measurements were made using a hairpin probe. The main result is the dynamics of the intensity ratios of selected argon and xenon lines under different conditions: at pressures of 40, 200, and 400 mTorr, low-frequency voltage amplitudes of 100, 200, and 400 V, and input power at 81 MHz of 3 and 15 W. The dynamics of high-energy electrons was investigated based on a two-temperature approximation of the electron energy probability function.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140597807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-01DOI: 10.3103/s0027134924700115
D. R. Bessmertniy, A. E. Ieshkin
Abstract
A model for the evolution of surface nanorelief under irradiation with gas cluster ions is proposed. The model is based on the consideration of individual cluster collisions with a surface. The amount of material sputtered from the collision area and the efficiency of its redeposition on other surface elements are determined. The model’s performance is demonstrated through comparison with experimental data. The stages of smoothing the model harmonic relief are investigated. A new measure of surface smoothing efficiency is proposed.
{"title":"Model of Surface Nanorelief Formation under Irradiation with Gas Cluster Ions","authors":"D. R. Bessmertniy, A. E. Ieshkin","doi":"10.3103/s0027134924700115","DOIUrl":"https://doi.org/10.3103/s0027134924700115","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A model for the evolution of surface nanorelief under irradiation with gas cluster ions is proposed. The model is based on the consideration of individual cluster collisions with a surface. The amount of material sputtered from the collision area and the efficiency of its redeposition on other surface elements are determined. The model’s performance is demonstrated through comparison with experimental data. The stages of smoothing the model harmonic relief are investigated. A new measure of surface smoothing efficiency is proposed.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140597644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-10DOI: 10.3103/s0027134923060048
Hassane El Bekkouri, El Mehdi Al Ibrahmi, Mohamed El-Asery, Zouhair Sadoune, Adil Bardane, Abdessamad Didi, El Mahjoub Chakir
Abstract
In recent times, Monte Carlo simulations are gaining widespread recognition as the most precise tool for calculating particle interactions with matter. In this study, we investigated two primary aspects. Firstly, we examined how the average excitation energy of water ((I_{W})) influences the location of the Bragg peak (BP). Secondly, we used the particle and heavy ion transport code system (PHITS) to study the Bragg curve of ({}^{12})C ion beam having an energy of 200 MeV/u in three different mediums: water, soft tissue, and bone. Lastly, we examined the impact of secondary particles on the overall dose. Our findings indicate that the average excitation energy of water strongly influences the position of the BP. The tail dose beyond the BP primarily results from secondary fragments of the primary carbon ion beams. Furthermore, the PHITS code accurately reproduces the measured Bragg curves.
摘要 近来，蒙特卡罗模拟作为计算粒子与物质相互作用的最精确工具得到了广泛认可。在这项研究中，我们主要研究了两个方面。首先，我们研究了水（(I_{W})）的平均激发能量如何影响布拉格峰（BP）的位置。其次，我们使用粒子和重离子传输代码系统（PHITS）研究了能量为200 MeV/u的({}^{12})C离子束在水、软组织和骨骼三种不同介质中的布拉格曲线。最后，我们研究了二次粒子对总体剂量的影响。我们的研究结果表明，水的平均激发能量对 BP 的位置有很大影响。BP 以外的尾部剂量主要来自原碳原子束的二次碎片。此外，PHITS 代码准确地再现了测量到的布拉格曲线。
{"title":"Simulation of Particle Interactions with Matter Using PHITS Monte Carlo Code: Physical Aspects of Bragg Curve for Carbon Ion Therapy","authors":"Hassane El Bekkouri, El Mehdi Al Ibrahmi, Mohamed El-Asery, Zouhair Sadoune, Adil Bardane, Abdessamad Didi, El Mahjoub Chakir","doi":"10.3103/s0027134923060048","DOIUrl":"https://doi.org/10.3103/s0027134923060048","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In recent times, Monte Carlo simulations are gaining widespread recognition as the most precise tool for calculating particle interactions with matter. In this study, we investigated two primary aspects. Firstly, we examined how the average excitation energy of water <span>((I_{W}))</span> influences the location of the Bragg peak (BP). Secondly, we used the particle and heavy ion transport code system (PHITS) to study the Bragg curve of <span>({}^{12})</span>C ion beam having an energy of 200 MeV/u in three different mediums: water, soft tissue, and bone. Lastly, we examined the impact of secondary particles on the overall dose. Our findings indicate that the average excitation energy of water strongly influences the position of the BP. The tail dose beyond the BP primarily results from secondary fragments of the primary carbon ion beams. Furthermore, the PHITS code accurately reproduces the measured Bragg curves.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140100247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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