The process of surface wakefields excitation by the relativistic electron bunch in a polar semiconductor waveguide with a vacuum channel for electron bunch propagation is studied. The spectra and spatio-temporal structure of the excited surface wakefield in such system are investigated. It is shown that the excited full surface wakefield in the terahertz and infrared frequency ranges consists of the fields of LF and HF hybrid plasmon-phonon oscillations. The amplitudes of them are determined.
{"title":"EXCITATION OF WAKE SURFACE PLASMON-PHONON OSCILLATIONS BY A RELATIVISTIC ELECTRON BUNCH IN A POLAR SEMICONDUCTOR WAVEGUIDE","authors":"V. Balakirev, I. Onishchenko","doi":"10.46813/2023-148-074","DOIUrl":"https://doi.org/10.46813/2023-148-074","url":null,"abstract":"The process of surface wakefields excitation by the relativistic electron bunch in a polar semiconductor waveguide with a vacuum channel for electron bunch propagation is studied. The spectra and spatio-temporal structure of the excited surface wakefield in such system are investigated. It is shown that the excited full surface wakefield in\u0000the terahertz and infrared frequency ranges consists of the fields of LF and HF hybrid plasmon-phonon oscillations. The amplitudes of them are determined.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"40 23","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139007805","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}
The variation of parameters of a sequence of two laser pulses exciting wakefield in a metal density plasma are considered as a way to improve the self-injected bunch stability: suppression of transverse bunch decay and increasing the existing time of a self-injected bunch in plasma are investigated. Two scenarios of parameter variation were considered. In the first scenario, the simultaneous variation of the parameters of both laser pulses was considered; in the second scenario, the set of parameters for one of the laser pulses after variation differed from the set of parameters for the other laser pulse (profiled sequence of 2 laser pulses) was considered.
{"title":"IMPROVING STABILITY OF THE SELF-INJECTED BUNCH BY VARIATION OF A SEQUENCE OF TWO LASER PULSES PARAMETERS AT WAKEFIELD EXCITATION IN A METAL DENSITY PLASMA","authors":"D. Bondar, V. Maslov, I. Onishchenko","doi":"10.46813/2023-148-069","DOIUrl":"https://doi.org/10.46813/2023-148-069","url":null,"abstract":"The variation of parameters of a sequence of two laser pulses exciting wakefield in a metal density plasma are considered as a way to improve the self-injected bunch stability: suppression of transverse bunch decay and increasing the existing time of a self-injected bunch in plasma are investigated. Two scenarios of parameter variation were considered. In the first scenario, the simultaneous variation of the parameters of both laser pulses was considered; in the second scenario, the set of parameters for one of the laser pulses after variation differed from the set of parameters for the other laser pulse (profiled sequence of 2 laser pulses) was considered.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"12 5","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139008729","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}
S.O. Vdovin, O. Manuilenko, M. Shulika, O. Shulika
Presented is the concept of a 800 MeV proton linear accelerator as a result of long-term research in ion linacs based on alternating-phase focusing (APF) in H-mode structures. Particle motion stability in the medium energy range of 5…100 MeV where the space charge effects are essential and main radiation losses occur, is provided by a combination of modified APF and magnetic focusing. This combined focusing technique can effectively prevent emittance growth and minimize radiation losses.
{"title":"CONCEPTUAL DESIGN OF A RADIATION-FREE 800 MeV PROTON LINAC","authors":"S.O. Vdovin, O. Manuilenko, M. Shulika, O. Shulika","doi":"10.46813/2023-148-126","DOIUrl":"https://doi.org/10.46813/2023-148-126","url":null,"abstract":"Presented is the concept of a 800 MeV proton linear accelerator as a result of long-term research in ion linacs based on alternating-phase focusing (APF) in H-mode structures. Particle motion stability in the medium energy range of 5…100 MeV where the space charge effects are essential and main radiation losses occur, is provided by a combination of modified APF and magnetic focusing. This combined focusing technique can effectively prevent emittance growth and minimize radiation losses.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"24 8","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139008881","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}
D.O. Shendryk, R. Ovsiannikov, V.I. Maslov, J. Osterhof, M. Thevenet
We formulate scenario for the simultaneous enhancement of the charge of accelerated electrons, improving such characteristics as the transformer ratio, efficiency, low energy spread, and emittance of bunches of accelerated electrons in the blowout regime by the simultaneous achievement of the identical plateaus on the accelerating wakefields and other identical plateaus on the decelerating wakefields.
{"title":"SIMULATION OF THE IDENTICAL PLATEAUS FORMATION ON PLASMA WAKEFIELD FOR LONG DRIVER-BUNCH AND WITNESS-BUNCHES","authors":"D.O. Shendryk, R. Ovsiannikov, V.I. Maslov, J. Osterhof, M. Thevenet","doi":"10.46813/2023-148-065","DOIUrl":"https://doi.org/10.46813/2023-148-065","url":null,"abstract":"We formulate scenario for the simultaneous enhancement of the charge of accelerated electrons, improving such characteristics as the transformer ratio, efficiency, low energy spread, and emittance of bunches of accelerated electrons in the blowout regime by the simultaneous achievement of the identical plateaus on the accelerating wakefields\u0000and other identical plateaus on the decelerating wakefields.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"2 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139009337","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}
Deflection system was designed and computed to spatially separate beam of electrons with different energies in the range of several tens of kiloelectronvolts. Three specific cases with electron energies of (33.9 ± 0.3), (18.2 ± 0.3), and (14.2 ± 0.3) keV were examined for experiments using Dielectric Laser Accelerators. The results of calculations of the spatial distribution of the magnetic field induced by a pair of permanent magnets and its effect on electrons moving in this field are presented. Such magnetic spectrometers differ from their analogues in that par- ticles do not move along the center between magnets in a uniform magnetic field, but along their periphery, where the field is non-uniform, which provides higher resolution. Presented spectrometer provides the electron energy resolution of less than 10 eV. Research on such systems holds significant importance for the further development of methods for analyzing electrons with varying energies in modern accelerators and spectrometers.
设计并计算了偏转系统，以便在几十千电子伏特的范围内对不同能量的电子束进行空间分离。在使用介质激光加速器进行实验时，对电子能量分别为（33.9 ± 0.3）、（18.2 ± 0.3）和（14.2 ± 0.3）千电子伏特的三种具体情况进行了研究。对一对永久磁铁所引起的磁场的空间分布及其对在该磁场中运动的电子的影响的计算结果进行了介绍。这种磁谱仪与同类仪器的不同之处在于，粒子不是沿着均匀磁场中磁铁之间的中心移动，而是沿着磁场不均匀的磁铁外围移动，因此分辨率更高。目前的光谱仪可提供小于 10 eV 的电子能量分辨率。对这种系统的研究对于进一步开发现代加速器和光谱仪中不同能量电子的分析方法具有重要意义。
{"title":"SIMULATION OF DEFLECTING SYSTEM BASED ON PERMANENT MAGNETS WITH A NON-UNIFORM MAGNETIC FIELD TO REGISTER ACCELERATED AND DECELERATED ELECTRONS GENERATED IN DIELECTRIC LASER ACCELERATOR","authors":"I. V. Beznosenko, A. Vasyliev, G.V. Sotnikov","doi":"10.46813/2023-148-110","DOIUrl":"https://doi.org/10.46813/2023-148-110","url":null,"abstract":"Deflection system was designed and computed to spatially separate beam of electrons with different energies in the range of several tens of kiloelectronvolts. Three specific cases with electron energies of (33.9 ± 0.3), (18.2 ± 0.3), and (14.2 ± 0.3) keV were examined for experiments using Dielectric Laser Accelerators. The results of calculations of the spatial distribution of the magnetic field induced by a pair of permanent magnets and its effect on electrons moving in this field are presented. Such magnetic spectrometers differ from their analogues in that par-\u0000ticles do not move along the center between magnets in a uniform magnetic field, but along their periphery, where the field is non-uniform, which provides higher resolution. Presented spectrometer provides the electron energy resolution of less than 10 eV. Research on such systems holds significant importance for the further development of methods for analyzing electrons with varying energies in modern accelerators and spectrometers.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"58 10","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139007137","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}
V. Mytrochenko, S. O. Perezhogin, L. Selivanov, V.A. Kushnir
A photoneutrons source based on the NSC KIPT LUE-40 electron linac was designed and constructed to study the effect of neutron and gamma radiation on the properties of materials used in high-energy physics (HEP) detectors. The source was used to irradiate the optical elements of the PLUME detector in LHCb experiment with the neutron fluency of 1014 cm-2. Ways to increase the neutron yield, in particular, by installing an additional high Z metal shell are shown. At electron energy of 85 MeV, the neutron yield exceeds 10-2 neutron over one electron.
{"title":"LUE-40 LINAC BASED NEUTRON SOURCE FOR IRRADIATION TESTS OF HEP DETECTOR MATERIALS AND COMPONENTS","authors":"V. Mytrochenko, S. O. Perezhogin, L. Selivanov, V.A. Kushnir","doi":"10.46813/2023-148-150","DOIUrl":"https://doi.org/10.46813/2023-148-150","url":null,"abstract":"A photoneutrons source based on the NSC KIPT LUE-40 electron linac was designed and constructed to study the effect of neutron and gamma radiation on the properties of materials used in high-energy physics (HEP) detectors. The source was used to irradiate the optical elements of the PLUME detector in LHCb experiment with the neutron fluency of 1014 cm-2. Ways to increase the neutron yield, in particular, by installing an additional high Z metal shell are shown. At electron energy of 85 MeV, the neutron yield exceeds 10-2\u0000neutron over one electron.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"36 11","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139007532","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}
The parabolic Ishimaru equation for the electromagnetic field coherence function, which describes the temporal properties of pulse at the output of inhomogeneous non-dissipative medium, is considered. The generalization of the approach used in the Ishimaru model to describe the temporal evolution of the envelope of the monochromatic electromagnetic video-pulse in homogeneous non-dissipative media is generalized to the case of non-homogeneous nondissipative media. An attempt was made to take into account the influence of the inhomogeneity of the medium on the shape of the resulting pulse. An explicit expression for the Green's function of the problem is obtained and number of numerical experiments are carried out. The paper studies the invariant longitudinal (temporal) properties of the envelope of monochromatic electromagnetic pulses recorded after passing through flat layer of the scattering inhomogeneous medium, i.e. properties that remain unchanged when the environment parameters vary. Examples of numerical experiments are given.
{"title":"ANALYTICAL AND NUMERICAL SOLUTIONS OF THE PARABOLIC EQUATION ISHIMARU FOR THE ELECTROMAGNETIC FIELD, DESCRIBING THE TEMPORARY PROPERTIES OF THE OUTPUT VIDEO-PULSE HETEROGENEOUS NON-DISSIPATIVE MEDIUM","authors":"O. Mazmanishvili","doi":"10.46813/2023-148-052","DOIUrl":"https://doi.org/10.46813/2023-148-052","url":null,"abstract":"The parabolic Ishimaru equation for the electromagnetic field coherence function, which describes the temporal properties of pulse at the output of inhomogeneous non-dissipative medium, is considered. The generalization of the approach used in the Ishimaru model to describe the temporal evolution of the envelope of the monochromatic electromagnetic video-pulse in homogeneous non-dissipative media is generalized to the case of non-homogeneous nondissipative media. An attempt was made to take into account the influence of the inhomogeneity of the medium on the shape of the resulting pulse. An explicit expression for the Green's function of the problem is obtained and number of numerical experiments are carried out. The paper studies the invariant longitudinal (temporal) properties of the envelope of monochromatic electromagnetic pulses recorded after passing through flat layer of the scattering inhomogeneous medium, i.e. properties that remain unchanged when the environment parameters vary. Examples of\u0000numerical experiments are given.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"12 7","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139008728","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}
Kh.F. Mammadov, H. Shiraliyeva, A.H. Huseynova, A.Sh. Huseynov
Higher values of the total radiation and the intensity of alpha radiation were observed in soil areas around thermal and cold springs on the mountain slopes of the Kelbajar region of Azerbaijan. The concentration of radioactive radon in the water of the thermal springs of the “Istisu” sanatorium, located at an altitude (2203 m), is below the directive indicator. However, the concentration of radon in the water of springs, located at an altitude of 2385 m, exceeds the directive indicator by 100 times. Soil samples taken from areas around springs contain uranium isotopes in similar proportions found in natural uranium deposits. Regularities of sorption of uranium isotopes from aqueous solutions on some adsorbents have been studied. It has been established that weak Van der Waals forces exist between the absorbed isotopes and the adsorbents.
{"title":"CONCENTRATION OF RADON IN SPRINGS OF KELBAJAR REGION, REGULARITIES OF ADSORBTION OF RADIONUCLIDES FROM SOLUTIONS ON ADSORBENTS","authors":"Kh.F. Mammadov, H. Shiraliyeva, A.H. Huseynova, A.Sh. Huseynov","doi":"10.46813/2023-148-023","DOIUrl":"https://doi.org/10.46813/2023-148-023","url":null,"abstract":"Higher values of the total radiation and the intensity of alpha radiation were observed in soil areas around thermal and cold springs on the mountain slopes of the Kelbajar region of Azerbaijan. The concentration of radioactive radon in the water of the thermal springs of the “Istisu” sanatorium, located at an altitude (2203 m), is below the directive indicator. However, the concentration of radon in the water of springs, located at an altitude of 2385 m, exceeds the directive indicator by 100 times. Soil samples taken from areas around springs contain uranium isotopes in similar proportions found in natural uranium deposits. Regularities of sorption of uranium isotopes from aqueous solutions on some adsorbents have been studied. It has been established that weak Van der Waals forces exist between the absorbed isotopes and the adsorbents.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"32 14","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139007295","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}
V. Uvarov, A. Zakharchenko, N. Dikiy, Y. Lyashko, R. Pomatsalyuk, V. Shevchenko, E. Malets
Within the framework of the developed analytical model for description of the isotope production by bremsstrahlung radiation, the three key phenomenological parameters of the process have been established. Those parameters determine the total yield and volumetric distribution of the products of a photonuclear reaction with dominating giant dipole resonance (GDR) in a target. The applicability conditions as well as the accuracy of the phenomenological description of a flux of the above-threshold bremsstrahlung photons are studied. The form of description of a reference bremsstrahlung spectrum for analytical calculation of the photonuclear processes is proposed. The conditions and accuracy of its reproduction at an electron accelerator are investigated
{"title":"FORMATION AND FENOMENOLOGICAL DESCRIPTION OF BREMSSTRAHLUNG BEAM FOR PHOTONUCLEAR PROCESSES","authors":"V. Uvarov, A. Zakharchenko, N. Dikiy, Y. Lyashko, R. Pomatsalyuk, V. Shevchenko, E. Malets","doi":"10.46813/2023-148-180","DOIUrl":"https://doi.org/10.46813/2023-148-180","url":null,"abstract":"Within the framework of the developed analytical model for description of the isotope production by bremsstrahlung radiation, the three key phenomenological parameters of the process have been established. Those parameters determine the total yield and volumetric distribution of the products of a photonuclear reaction with dominating giant dipole resonance (GDR) in a target. The applicability conditions as well as the accuracy of the phenomenological description of a flux of the above-threshold bremsstrahlung photons are studied. The form of description of a reference bremsstrahlung spectrum for analytical calculation of the photonuclear processes is proposed. The conditions and accuracy of its reproduction at an electron accelerator are investigated","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"44 6","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139008140","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}
V.T. Maslyuk, Ye.O. Skakun, I.L. Semisalov, M. Romanyuk
The work considers an alternative way of formation of chemical elements during the disintegration of nuclear matter formed during the explosion of stars. In addition to the energy parameters that determine the stability of nuclear matter and the ways of its disintegration, the entropy factor must also be considered. The calculation points to its extreme feature in the transition from symmetric to structured or asymmetric decay caused by the “inclusion” of quantum effects from nuclear shells.
{"title":"NUCLEOSYNTHESIS OF NUCLEAR MATTER: ENTROPY EFFECTS","authors":"V.T. Maslyuk, Ye.O. Skakun, I.L. Semisalov, M. Romanyuk","doi":"10.46813/2023-148-003","DOIUrl":"https://doi.org/10.46813/2023-148-003","url":null,"abstract":"The work considers an alternative way of formation of chemical elements during the disintegration of nuclear matter formed during the explosion of stars. In addition to the energy parameters that determine the stability of nuclear matter and the ways of its disintegration, the entropy factor must also be considered. The calculation points to\u0000its extreme feature in the transition from symmetric to structured or asymmetric decay caused by the “inclusion” of quantum effects from nuclear shells.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"56 3","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139008228","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：