Physics of Atomic Nuclei最新文献_第9页

Characteristics of Interaction of Energetic Electrons with Heavy Impurity Ions in Tokamak Plasma

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-01-23 DOI: 10.1134/S1063778824130234

V. E. Zhogolev, S. V. Konovalov

{"title":"Characteristics of Interaction of Energetic Electrons with Heavy Impurity Ions in Tokamak Plasma","authors":"V. E. Zhogolev, S. V. Konovalov","doi":"10.1134/S1063778824130234","DOIUrl":"10.1134/S1063778824130234","url":null,"abstract":"Collisions of the fast electrons with partially stripped high-Z impurity ions in a tokamak plasma are considered. The Thomas–Fermi model is used in calculation of the form factor which describes the screening of the potential of impurity nuclei. The calculated dependence of the form factor on the transferred momentum of the fast electron at elastic collisions allows accurate evaluation of the differential scattering cross section and transport collision frequency accounting for the relativistic effects. The transport collision frequency for the energetic electrons in the plasma with partially stripped impurity ions is shown to exceed strongly the frequency calculated for the fully ionized plasma with equivalent effective charge. This is apparently the situation occurring in the tokamak plasma disruptions accompanied by generation of runaway electrons. An algorithm to calculate collisional energy loss of the fast electrons is suggested as a generalization of that for electron drag in neutral media. Analysis of the collisional drag of the fast electrons on the partially ionized plasma demonstrates that formal replacement in the collision integral of the electron plasma density with the sum of the free electron density and half of the bound electron density provides sufficiently high, ~10%, accuracy in evaluating the fast electron energy losses. The presented results allow accurate evaluation of collisional effects in the simulation of the fast electron dynamics.","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 1 supplement","pages":"S218 - S232"},"PeriodicalIF":0.3,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109188","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}

引用次数: 0

Determination of the Characteristics of Neutron Field of the IGRIK-2 Reactor Using the Neutron Activation Method 用中子活化法测定IGRIK-2反应堆中子场特性

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-01-11 DOI: 10.1134/S1063778824080015

A. R. Baphaev, V. I. Litvin, A. A. Kuzinskaya, L. S. Ershova

引用次数: 0

Machine Learning Method for Validation of the Computational Model of Nonstationary Xenon Processes in the VVER Reactor Based on the Algorithm of Separation of Variables 基于分离变量算法的VVER反应堆非平稳氙过程计算模型验证的机器学习方法

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-01-11 DOI: 10.1134/S1063778824080210

A. L. Nikolaev, M. A. Uvakin, M. V. Antipov, I. V. Makhin, G. A. Ryabov

{"title":"Machine Learning Method for Validation of the Computational Model of Nonstationary Xenon Processes in the VVER Reactor Based on the Algorithm of Separation of Variables","authors":"A. L. Nikolaev, M. A. Uvakin, M. V. Antipov, I. V. Makhin, G. A. Ryabov","doi":"10.1134/S1063778824080210","DOIUrl":"10.1134/S1063778824080210","url":null,"abstract":"In the paper, we present a method for validating the KORSAR/GP software package in terms of a mathematical model of nonstationary xenon processes in a VVER reactor that is based on the separation of spatial and temporal variables. The data obtained from various high-power VVER installations in experiments to study the spatial distribution of energy release under nonstationary reactor poisoning conditions caused by the action of various regulators are used. The model is based on the classification of means of affecting reactivity by the type of variable in energy release, which undergoes changes significant for the process as a result of this impact. Nonstationary xenon poisoning processes, which involve control rods of the control and protection systems and water exchange operations with a change in the concentration of boric acid, as well as both of the listed methods, both in the presence of a change in the neutron power of the reactor and when maintaining its constant value, are considered. A machine learning method on the basis of regression analysis making it possible to estimate the error in calculating the parameters of the energy release field under conditions of spatial, temporal, and spatiotemporal feedback of the xenon concentration and regulators is developed. On the basis of the processed experimental data, a training array, which is used for machine learning of this model, is formed. As a result of the developed algorithm, an error estimate for the model of the computing code with allowance for the partial impact of various means of changing the reactivity in a given calculation is made.","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 8","pages":"1030 - 1038"},"PeriodicalIF":0.3,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142963078","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}

引用次数: 0

Numerical Simulation of Fluid Flow and Heat Transfer at Supercritical Pressures of Water Coolant for a Wire-Wrapped Rod Bundle 线包棒束水冷剂超临界压力下流体流动与传热的数值模拟

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-01-11 DOI: 10.1134/S1063778824080209

V. Yu. Kukanov, A.A. Sedov, P. S. Polyakov

引用次数: 0

Estimation of Filamentary Transport Parameters at the Edge of Tokamak MEPhIST-0 托卡马克MEPhIST-0边缘微丝输运参数的估计

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-01-11 DOI: 10.1134/S1063778824070123

A. A. Stepanenko, S. A. Krat

引用次数: 0

Effect of Radiation Exposure on Optics in ITER ITER中辐射暴露对光学的影响

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-01-11 DOI: 10.1134/S1063778824070160

K. Yu. Vukolov, E. N. Andreenko, R. S. Afanasenko, I. I. Orlovskiy, R. N. Rodionov

引用次数: 0

Advances in the Physical Start-Up Test Program for VVER-1200 Power Units VVER-1200发电机组物理启动试验程序研究进展

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-01-11 DOI: 10.1134/S1063778824080234

S. V. Tsyganov, Yu. A. Kraynov, A. A. Gribov

引用次数: 0

Experimental Study of the Gamma Component in the Rhodium SPD Signal 铑SPD信号中伽马分量的实验研究

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-01-11 DOI: 10.1134/S1063778824080064

V. N. Kochkin, A. Yu. Kurchenkov, E. N. Poznyrev, Yu. M. Semchenkov

引用次数: 0

PRIM-AES Software Package for Simulation of Transient Modes at Power Units with VVER Reactors 带VVER反应堆的发电机组瞬态模式仿真软件包

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-01-11 DOI: 10.1134/S1063778824080039

D. A. Gornostaev, A. V. Budnikov, E. D. Sokurenko, A. V. Fomin, A. S. Kolokol

{"title":"PRIM-AES Software Package for Simulation of Transient Modes at Power Units with VVER Reactors","authors":"D. A. Gornostaev, A. V. Budnikov, E. D. Sokurenko, A. V. Fomin, A. S. Kolokol","doi":"10.1134/S1063778824080039","DOIUrl":"10.1134/S1063778824080039","url":null,"abstract":"A description of the PRIM-AES software package (NPP simulator program) for modeling neutronic and thermal-hydraulic processes in transient modes at power units with VVER reactors is presented. The package includes a dynamic-simulation environment for the implementation of complex algorithms for automatic control systems based on SimInTech CAD systems and the TIGR-M program for combined neutronic and thermal-hydraulic calculation of normal operation and emergency modes, which is a development of the TIGR-1 software package. The modernization of the thermal-hydraulic module of the TIGR-1 software package is described, which is carried out to extend the applicability of the code in the volume of the power unit. The structure of a new software-computing package with a description of its constituent modules and the interface for data exchange between them has been developed and presented. The goals and objectives of the application of the developed software package are determined, which allow assessing the relevant criteria of dynamic stability for stationary modes of normal operation and transient modes of normal operation, including power maneuvering modes, and operation limitation modes in the case of violation of safe operation conditions and emergency modes of the second category involving failures of the main equipment.","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 8","pages":"1089 - 1100"},"PeriodicalIF":0.3,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142963018","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}

引用次数: 0

Methodology for Calculating the Hydrogen Isotope Inventory in Tritium Fuel Cycle Systems of the DEMO-FNS Tokamak DEMO-FNS托卡马克氚燃料循环系统氢同位素库存的计算方法

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-01-11 DOI: 10.1134/S1063778824070019

S. S. Ananyev, B. V. Ivanov

{"title":"Methodology for Calculating the Hydrogen Isotope Inventory in Tritium Fuel Cycle Systems of the DEMO-FNS Tokamak","authors":"S. S. Ananyev, B. V. Ivanov","doi":"10.1134/S1063778824070019","DOIUrl":"10.1134/S1063778824070019","url":null,"abstract":"The applied technologies for handling tritium and the efficiency of its use in the fuel cycle of a fusion facility affect the start-up tritium inventory, the possibility of tritium self-sufficiency, etc. These parameters largely determine the cost of the facility, its efficiency, and safety during operation. Formation of the conceptual configuration of the fuel cycle, calculation of the tritium inventory in its systems, and determination of the scope for further development are important problems in facility design. In order to calculate the flows of fuel components and tritium inventory in the fuel cycle (FC) of a tokamak-based fusion neutron source, the FC-FNS code developed at the Kurchatov Institute has been used since 2013. It implements the possibility of calculating the number of hydrogen isotopes contained in different FC systems. The article describes the current state of research on modeling the flow of fuel components in FC systems of the tokamak with a tritium-breeding blanket, presents simplified schemes of FC systems, and describes the principles of their operation and the methodology for calculating the inventory of hydrogen isotopes in them. It is substantiated that the number of fuel components in the facility will be primarily determined by fuel cycle technologies, which, in turn, depend on plasma parameters and scenarios of facility operation. It is shown that, for the DEMO-FNS project with a fusion power of 40 MW, which corresponds to the combustion of 7 × 10–5 g/s of tritium, the startup tritium inventory will be 400–430 g with a circulating fuel flow through the facility chamber of up to 0.1 g/s. Increasing fuel flows through the injection, hydrogen isotope separation, and some other DEMO-FNS systems, if convective edge-localized modes (ELMs) are taken into account, will lead to an increase in the operational tritium inventory in the fuel cycle up to 500 g. If there is a tritium-breeding blanket in the facility, tritium inventory in it (including the long-term storage) will be no more than 800 g.","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 7","pages":"958 - 978"},"PeriodicalIF":0.3,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142941040","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}

引用次数: 0