Physics of Particles and Nuclei Letters最新文献

{"title":"Kaon Modification in Pion Medium","authors":"Yu. B. Ivanov","doi":"10.1134/S1547477125700748","DOIUrl":"10.1134/S1547477125700748","url":null,"abstract":"<p>Kaon properties in thermal pion-nucleon medium are studied. The dense pion-nucleon medium is produced in high-energy heavy-ion collisions. The consideration is based on the chiral nucleon-kaon-pion Lagrangian. It is found that the pion medium does not produce a substantive contribution but enhances the effect of the baryon matter. Numerical estimate shows that this enhancement factor induced by the pion medium does not exceed 5% at the freeze-out stage of heavy-ion collisions, i.e., it is small. However, the impact of this enhancement can be higher in actual nuclear collisions because the effect of the in-medium (anti)kaon modification is accumulated during the (anti)kaon evolution before the freeze-out when the pion density is higher.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 4","pages":"865 - 868"},"PeriodicalIF":0.4,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1547477125700748.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Medical Superconducting Cyclotron MSC-230: Project Status","authors":"P. G. Akishin,&nbsp;V. A. Vesenkov,&nbsp;A. I. Vlasov,&nbsp;Yu. N. Gavrish,&nbsp;V. A. Gerasimov,&nbsp;O. M. Golubitskii,&nbsp;S. V. Gursky,&nbsp;O. V. Karamyshev,&nbsp;G. A. Karamysheva,&nbsp;I. D. Lyapin,&nbsp;V. A. Malinin,&nbsp;V. G. Mudrolubov,&nbsp;D. N. Nikiforov,&nbsp;Yu. K. Osina,&nbsp;A. A. Pavlova,&nbsp;I. M. Palnikov,&nbsp;R. V. Pivin,&nbsp;D. V. Popov,&nbsp;V. M. Romanov,&nbsp;A. A. Sinitsa,&nbsp;K. E. Smirnov,&nbsp;G. V. Trubnikov,&nbsp;S. G. Shirkov,&nbsp;S. B. Fedorenko,&nbsp;H. G. Khodzhibagiyan,&nbsp;S. L. Yakovenko","doi":"10.1134/S1547477125700712","DOIUrl":"10.1134/S1547477125700712","url":null,"abstract":"<p>Joint Institute for Nuclear Research in cooperation with AO NIIEFA build medical superconducting cyclotron MSC-230. Parameters of the magnetic field and the resonance system and the proton beam dynamics were simulated. The development of the cyclotron structure is in progress. The manufacture of the cyclotron units was started. A description of the MSC-230, its parameters and status of the project are presented.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 4","pages":"847 - 851"},"PeriodicalIF":0.4,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814448","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}

{"title":"On the Role of the Timing of the Electron Beam Injection into the Accelerating Structure of the LUE-200 Accelerator when Using the RF Power Compression System","authors":"I. S. Zhironkin,&nbsp;A. P. Sumbaev,&nbsp;V. V. Kobets,&nbsp;A. E. Levichev","doi":"10.1134/S1547477125700311","DOIUrl":"10.1134/S1547477125700311","url":null,"abstract":"<p>The results measuring the energy characteristics of the electron beam upon a change in the time that the beam is injected into the accelerating structure of the LUE-200 accelerator (the driver of the IREN facility, a pulsed photoneutron source at the Joint Institute for Nuclear Research (Dubna)), are presented. When using the SLED RF power compression system, the moment the beam is injected into the accelerating structure has been shown to be important in the formation and optimization of acceleration modes.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 4","pages":"654 - 659"},"PeriodicalIF":0.4,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814294","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}

{"title":"Influence of Space Charge Waves on Measurements with Pickups","authors":"E. R. Urazov,&nbsp;E. A. Bekhtenev,&nbsp;M. I. Bryzgunov,&nbsp;V. V. Parkhomchuk,&nbsp;V. B. Reva","doi":"10.1134/S1547477125700669","DOIUrl":"10.1134/S1547477125700669","url":null,"abstract":"<p>Space charge waves in electron beams affect both the sum signal from pickup electrodes and the beam position measurements. The lowering of the sum signal can drastically decrease the precision of the measurements. If the wave is asymmetric, the space charge modulation can propagate transversally and compromise the accuracy of the position measurements.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 4","pages":"825 - 827"},"PeriodicalIF":0.4,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814546","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}

{"title":"Beam Shaping Assembly of the VITA Accelerator-Based Neutron Source","authors":"T. V. Shein,&nbsp;E. A. Berendeev,&nbsp;V. S. Degtyarev,&nbsp;A. M. Koshkarev,&nbsp;A. S. Kuznetsov,&nbsp;S. S. Savinov,&nbsp;S. Yu. Taskaev","doi":"10.1134/S1547477125700700","DOIUrl":"10.1134/S1547477125700700","url":null,"abstract":"<p>The VITA accelerator-based neutron source has been proposed and developed at the Budker Institute of Nuclear Physics (Novosibirsk, Russia) for boron neutron capture therapy (BNCT), which includes a vacuum-insulated tandem accelerator for proton beam production, a lithium target for neutron generation through the ⁷Li(<i>p</i>, <i>n</i>)⁷Be reaction, and a neutron beam shaping assembly (BSA) with MgF₂ moderator for therapeutic beam generation. This paper presents a comparison of the results of numerical simulations of boron dose and γ-ray dose spatial distributions in a water phantom for three different neutron beam shaping assemblies. The investigations are carried out at the VITA accelerator-based neutron source in the Budker Institute of Nuclear Physics, Siberian branch, Russian Academy of Sciences, using a small neutron detector to measure these components of ionizing radiation. An agreement between the measured and simulated results is obtained. For the VITA accelerator neutron source that was manufactured and is being supplied to the Blokhin National Medical Research Center of Oncology in Moscow with the purpose of conducting clinical trials of the BNCT technique in Russia and the subsequent treatment of patients, the BSA is optimized by numerical simulation with consideration for the equipment, the presence of structural materials, and the wall separating the installation room from the irradiation room. The description of materials that make it possible to form a neutron beam that meets the requirements of the BNCT and the design of manufactured BSA is presented.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 4","pages":"842 - 846"},"PeriodicalIF":0.4,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814425","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}

{"title":"Commissioning Status of the Technical Equipment at the Compressor Station CS 2 of the Veksler Baldin Laboratory of High Energy Physics","authors":"N. N. Agapov,&nbsp;A. N. Zharkov,&nbsp;A. O. Kolesnikov,&nbsp;A. V. Konstantinov,&nbsp;Yu. A. Kryukov,&nbsp;Yu. A. Mitrofanova,&nbsp;G. G. Stiforov,&nbsp;D. S. Shvidkiy","doi":"10.1134/S1547477125700694","DOIUrl":"10.1134/S1547477125700694","url":null,"abstract":"<p>Commissioning of the new superconducting accelerators (Booster and Collider) required more than doubling the cooling capacity of the VBLHEP’s cryogenic system. Two new Kaskad-110/30 screw helium compressors Nos. 3 and 4 have been installed at the compressor station CS No. 2 to supply compressed helium to the liquefier OG-1000 and satellite refrigerators RSG-2000/4.5 Nos. 1–3. In addition, a new closed cycle nitrogen cryogenic system of the accelerator NICA complex is currently under construction, which is intended for the production of liquid nitrogen, recondensation of nitrogen vapors, and supply of nitrogen of the consumers. Two Samsung SM5000 turbocompressors Nos. 1 and 2 and an Aerocom 2-179/18 turbocompressor will be used to supply compressed nitrogen to the cryogenic facilities.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 4","pages":"837 - 841"},"PeriodicalIF":0.4,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814449","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}

{"title":"Nitrogen Cryogenic System of the NICA Accelerator Complex","authors":"N. N. Agapov,&nbsp;A. P. Bulakh,&nbsp;S. V. Gudkov,&nbsp;A. E. Emelyanov,&nbsp;T. G. Zhironkina,&nbsp;A. V. Konstantinov,&nbsp;A. A. Kuznetsov,&nbsp;Yu. A. Mitrofanova,&nbsp;A. E. Smirnov,&nbsp;D. S. Shvidkiy","doi":"10.1134/S1547477125700475","DOIUrl":"10.1134/S1547477125700475","url":null,"abstract":"<p>A nitrogen cryogenic system with a capacity of 2300 kg/h of liquid nitrogen has been created for the NICA accelerator complex. The system includes a nitrogen liquefier with a capacity of 1300 kg/h and two nitrogen recondensers with a capacity of 500 kg/h each. To circulate gas in the system, two Samsung SM5000 turbocompressors with a capacity of 11 820 nm³/h each and an Aerocom 2-179/18 turbocompressor with a capacity of 10 740 nm³/h will be used. The commissioning of a closed-cycle nitrogen system will enhance the energy efficiency of the cryogenic complex, reduce the costs of its operation, and will make the complex independent of external supplies of liquid nitrogen. The status of mounting and commissioning of the equipment of the nitrogen cryogenic system for the NICA accelerator complex is presented.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 4","pages":"734 - 739"},"PeriodicalIF":0.4,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814566","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}

{"title":"Results of Wire Techniques Application for Magnetic Axis Measurement of NICA Booster and Collider Quadrupoles","authors":"I. Yu. Nikolaychuk,&nbsp;V. V. Borisov,&nbsp;S. A. Kostromin,&nbsp;D. N. Nikiforov","doi":"10.1134/S1547477125700499","DOIUrl":"10.1134/S1547477125700499","url":null,"abstract":"<p>Wire techniques are precise methods for main magnetic field parameters measurement of accelerator’s magnets. Vibrating wire method was used for magnetic axis position determine of NICA Collider and Booster quadrupoles (JINR, Dubna). Measurement results are used for correct magnets alignment at accelerator lattice. This paper describes main results of carried out measurement and studies. Present results of closed orbit modelling emphasize practical value of obtained measurement data for alignment.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 4","pages":"744 - 748"},"PeriodicalIF":0.4,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814568","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}

{"title":"Evolution of Accelerator Based Neutron Source VITA","authors":"M. I. Bikchurina,&nbsp;T. A. Bykov,&nbsp;G. D. Verkhovod,&nbsp;V. S. Degtyarev,&nbsp;D. A. Kasatov,&nbsp;A. A. Kashcheev,&nbsp;Ya. A. Kolesnikov,&nbsp;V. D. Konovalova,&nbsp;A. M. Koshkarev,&nbsp;A. S. Kuznetsov,&nbsp;G. M. Ostreinov,&nbsp;S. S. Savinov,&nbsp;N. Sh. Singatulina,&nbsp;E. A. Sokolova,&nbsp;A. E. Soldatov,&nbsp;I. N. Sorokin,&nbsp;T. V. Shein,&nbsp;A. A. Shuklina,&nbsp;I. M. Shchudlo,&nbsp;S. Yu. Taskaev","doi":"10.1134/S1547477125700621","DOIUrl":"10.1134/S1547477125700621","url":null,"abstract":"<p>Budker Institute of Nuclear Physics has proposed, developed, and is operating accelerator based neutron source VITA, which includes an electrostatic tandem accelerator of charged particles of an original design (vacuum insulated tandem accelerator), a lithium neutron-generating target, and set of neutron beam shaping assemblies. The facility generates the stationary beam of protons or deuterons with the energy of up to 2.3 MeV and the current of up to 10 mA, the generation of a powerful neutron flux, and the formation of a beam of neutrons of various energy ranges, from cold to fast. The facility is actively used for the development of boron neutron capture therapy of malignant tumors (BNCT), radiation testing of promising materials, measuring the cross-section of nuclear reactions and some other applications. The second version of the accelerator based neutron source VITA-II features the presence of pre-acceleration to increase the proton energy, the use of a volumetric source of negative hydrogen ions instead of a surface plasma source to increase the proton beam current, and a decreased height of the installation due to the modernization of the high-voltage power supply and its connection to the accelerator. The accelerator based neutron source VITA-IIα was provided to the BNCT clinic in Xiamen (China) for the treatment of patients with the BNCT method. The second accelerator neutron source, VITA-IIβ, was manufactured to equip Blokhin National Medical Research Center of Oncology in Moscow to conduct clinical trials of the BNCT technique in the Russian Federation starting in 2025. Based on the experience gained, the third version of the accelerator based neutron source VITA-III and the compact accelerator based neutron source VITAmin are under development. The design of neutron sources, their features, parameters and applicability are presented and discussed.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 4","pages":"807 - 810"},"PeriodicalIF":0.4,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814549","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}

{"title":"Maintenance of Beam Stability in a Cyclotron with Isochronism Control for Several Types of Ions Using Rotary Shims","authors":"Yu. K. Osina,&nbsp;A. V. Galchuck,&nbsp;I. V. Gorbunov","doi":"10.1134/S1547477125700517","DOIUrl":"10.1134/S1547477125700517","url":null,"abstract":"<p>In order to increase the beam current, the CC-30/15 cyclotron designed to accelerate negative hydrogen ions to an energy of 30 MeV and negative deuterium ions to 15 MeV was upgraded. This modification resulted in an increase in the channel diameter in the cyclotron poles and a change in the elements of the central region of the magnet. To adjust the main cyclotron magnet to these conditions, 3D calculations were carried out to ensure stable and isochronous ion acceleration to the final energy. Particular attention was paid to the maintenance of stability in the presence of the 2nd harmonic of the magnetic field from the rotary shims in the modes of hydrogen and deuterium ion.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 4","pages":"754 - 758"},"PeriodicalIF":0.4,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814500","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}