Quantum Beam Science最新文献_第7页

Experimental Setup for Irradiation of Cell Cultures at L2A2 细胞培养物在L2A2下辐照的实验装置

IF 1.4

Quantum Beam Science Pub Date : 2022-02-21 DOI: 10.3390/qubs6010010

Alberto Torralba, L. Palenciano, A. Reija, J. Rigla, Juan Peñas, J. Llerena, R. Contreras-Martínez, J. Benlliure, Ana Vega, Miguel E. Aguado-Barrera, C. Ruiz, M. Seimetz

{"title":"Experimental Setup for Irradiation of Cell Cultures at L2A2","authors":"Alberto Torralba, L. Palenciano, A. Reija, J. Rigla, Juan Peñas, J. Llerena, R. Contreras-Martínez, J. Benlliure, Ana Vega, Miguel E. Aguado-Barrera, C. Ruiz, M. Seimetz","doi":"10.3390/qubs6010010","DOIUrl":"https://doi.org/10.3390/qubs6010010","url":null,"abstract":"Laser–plasma proton sources and their applications to preclinical research has become a very active field of research in recent years. In addition to their small dimensions as compared to classical ion accelerators, they offer the possibility to study the biological effects of ultra-short particle bunches and the correspondingly high dose rates. We report on the design of an experimental setup for the irradiation of cell cultures at the L2A2 laboratory at the University of Santiago de Compostela, making use of a 1.2 J Ti: Sapphire laser with a 10 Hz repetition rate. Our setup comprises a proton energy separator consisting of two antiparallel magnetic fields realized by a set of permanent magnets. It allows for selecting a narrow energy window around an adaptable design value of 5 MeV out of the initially broad spectrum typical for Target Normal Sheath Acceleration (TNSA). At the same time, unwanted electrons and X-rays are segregated from the protons. This part of the setup is located inside the target vessel of the L2A2 laser. A subsequent vacuum flange sealed with a thin kapton window allows for particle passage to external sample irradiation. A combination of passive detector materials and real-time monitors is applied for measurement of the deposited radiation dose. A critical point of this interdisciplinary project is the manipulation of biological samples under well-controlled, sterile conditions. Cell cultures are prepared in sealed flasks with an ultra-thin entrance window and analysed at the nearby Fundación Pública Galega Medicina Xenómica and IDIS. The first trials will be centred at the quantification of DNA double-strand breaks as a function of radiation dose.","PeriodicalId":31879,"journal":{"name":"Quantum Beam Science","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44292584","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: 1

Laser Treatment as a New Approach to the Passivation of Iron-Based Historical Monuments 激光处理作为铁基古迹钝化的新方法

IF 1.4

Quantum Beam Science Pub Date : 2022-02-16 DOI: 10.3390/qubs6010009

Iuliia Ruzankina, V. Parfenov, O. Vasiliev, O. Zotov, A. Zotova

引用次数: 0

Surface Channeling of Charged and Neutral Beams in Capillary Guides 毛细管波导中带电和中性光束的表面沟道

IF 1.4

Quantum Beam Science Pub Date : 2022-02-14 DOI: 10.3390/qubs6010008

S. Dabagov, A. Dik

{"title":"Surface Channeling of Charged and Neutral Beams in Capillary Guides","authors":"S. Dabagov, A. Dik","doi":"10.3390/qubs6010008","DOIUrl":"https://doi.org/10.3390/qubs6010008","url":null,"abstract":"In this review work, the passage of charged and neutral beams through dielectric capillary guides is described from a uniform point of view of beams channeling in capillaries. The motion of beams into the hollow channels formed by the inner walls of capillaries is mainly determined by multiple small-angle scattering (reflection) and can be described in the approximation of surface channeling. It is shown that the surface interaction potential in the case of micro- and nano-capillaries is actually conditioned by the curvature of the reflecting surface. After presenting the analysis of previously performed studies on X-rays propagation into capillaries, which is valid for thermal neutrons, too, the surface channeling formalism is also developed for charged particle beams, in particular, moving in curved cylindrical capillaries. Alternative theories explaining experimental results on the beams passage through capillaries are based on simple thermodynamic estimates, on various diffusion models, and on the results of direct numerical simulations as well. Our work is the first attempt to explain the effective guiding of a charged beam by a capillary from the general standpoint of quantum mechanics, which made it possible to analytically explore the interaction potential for surface channeling. It is established that, depending on the characteristics of a projectile and a dielectric forming the channel, the interaction potential can be either repulsive or attractive; the limiting values of the potential function for the corresponding cases are determined. It has been demonstrated that the surface channeling behaviour can help in explaining the efficient capillary guiding for radiations and beams.","PeriodicalId":31879,"journal":{"name":"Quantum Beam Science","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46770830","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: 4

Polarimetric Quantum-Strong Correlations with Independent Photons on the Poincaré Sphere 庞加莱球上独立光子的偏振量子强相关

IF 1.4

Quantum Beam Science Pub Date : 2022-02-04 DOI: 10.20944/preprints202202.0073.v1

A. Vatarescu

引用次数: 4

Acknowledgment to Reviewers of Quantum Beam Science in 2021 向《量子束科学》2021年审稿人致谢

IF 1.4

Quantum Beam Science Pub Date : 2022-01-28 DOI: 10.3390/qubs6010007

引用次数: 0

MeV Cluster Ion Beam–Material Interaction MeV团簇离子束-材料相互作用

IF 1.4

Quantum Beam Science Pub Date : 2022-01-24 DOI: 10.3390/qubs6010006

T. Kaneko

引用次数: 1

Femtosecond Laser-Based Additive Manufacturing: Current Status and Perspectives 飞秒激光增材制造:现状与展望

IF 1.4

Quantum Beam Science Pub Date : 2022-01-18 DOI: 10.3390/qubs6010005

Atiq Basha Kaligar, Hemnath Anandan Kumar, Asghar Ali, W. Abuzaid, M. Egilmez, M. Alkhader, F. Abed, A. Alnaser

{"title":"Femtosecond Laser-Based Additive Manufacturing: Current Status and Perspectives","authors":"Atiq Basha Kaligar, Hemnath Anandan Kumar, Asghar Ali, W. Abuzaid, M. Egilmez, M. Alkhader, F. Abed, A. Alnaser","doi":"10.3390/qubs6010005","DOIUrl":"https://doi.org/10.3390/qubs6010005","url":null,"abstract":"The ever-growing interest in additive manufacturing (AM) is evidenced by its extensive utilisation to manufacture a broad spectrum of products across a range of industries such as defence, medical, aerospace, automotive, and electronics. Today, most laser-based AM is carried out by employing continuous-wave (CW) and long-pulsed lasers. The CW and long-pulsed lasers have the downside in that the thermal energy imparted by the laser diffuses around the irradiated spot and often leads to the creation of heat-affected zones (HAZs). Heat-affected zones may degrade the material strength by producing micro-cracks, porous structures and residual stresses. To address these issues, currently, attempts are being made to employ ultrafast laser sources, such as femtosecond (fs) lasers, in AM processes. Femtosecond lasers with pulse durations in the order of 10−15 s limit the destructive laser–material interaction and, thus, minimise the probability of the HAZs. This review summarises the current advancements in the field of femtosecond laser-based AM of metals and alloys. It also reports on the comparison of CW laser, nanosecond (ns)/picosecond (ps) lasers with fs laser-based AM in the context of heat-affected zones, substrate damage, microstructural changes and thermomechanical properties. To shed light on the principal mechanisms ruling the manufacturing processes, numerical predictions are discussed and compared with the experimental results. To the best of the authors’ knowledge, this review is the first of its kind to encompass the current status, challenges and opportunities of employing fs lasers in additive manufacturing.","PeriodicalId":31879,"journal":{"name":"Quantum Beam Science","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43904875","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: 12

Incident Angle Dependent Formation of Ion Tracks in Quartz Crystal with C60+ Ions: Big Ions in Small Channels C60+离子在石英晶体中随入射角形成的离子轨迹:小通道中的大离子

IF 1.4

Quantum Beam Science Pub Date : 2022-01-12 DOI: 10.3390/qubs6010004

H. Amekura, K. Narumi, A. Chiba, Y. Hirano, Keisuke Yamada, S. Yamamoto, Y. Saitoh

引用次数: 1

Optimization of the Guide Design of MIRACLES, the Neutron Time-of-Flight Backscattering Spectrometer at the European Spallation Source 欧洲散裂源中子飞行时间后向散射光谱仪的导引设计优化

IF 1.4

Quantum Beam Science Pub Date : 2021-12-31 DOI: 10.3390/qubs6010003

F. J. Villacorta, D. M. Rodríguez, M. Bertelsen, H. Bordallo

{"title":"Optimization of the Guide Design of MIRACLES, the Neutron Time-of-Flight Backscattering Spectrometer at the European Spallation Source","authors":"F. J. Villacorta, D. M. Rodríguez, M. Bertelsen, H. Bordallo","doi":"10.3390/qubs6010003","DOIUrl":"https://doi.org/10.3390/qubs6010003","url":null,"abstract":"To boost the science case of MIRACLES, the time-of-flight backscattering spectrometer at the European Spallation Source (ESS), an optimized neutron guide system, is proposed. This systematic study resulted in an enhancement in the transport of cold neutrons, compared with the previous conceptual design, with wavelengths ranging from λ = 2 Å to 20 Å along the 162.5-m distance from source to sample. This maintained the undisturbed main focus of the instrument, viz, to carry out quasielastic and inelastic neutron scattering (QENS and INS) experiments on a large dynamic range and for both energy-gain and energy-loss sides. To improve the collection of cold neutrons from the source and direct them to the sample position, the vertical geometry was adjusted to an adapted version of a ballistic elliptical profile. Its horizontal geometry was conceived to: (i) keep the high-resolution performance of the instrument, and (ii) minimize the background originating from fast and thermal neutrons. To comply with the first requirement, a narrow guide section at the pulse shaping chopper position has been implemented. To fulfil the second, a curved guide segment has been chosen to suppress neutrons with wavelengths λ < 2 Å. Subsequent tailoring of the phase space provided an efficient transport of cold neutrons along the beamline to reach a 3 × 3 cm2 sample. Finally, additional calculations were performed to present a potential upgrade, with the exchange of the final segment, to focus on samples of approximately 1 × 1 cm2; the proposal anticipates a flux increase of 70% in this 1 cm2 sample area.","PeriodicalId":31879,"journal":{"name":"Quantum Beam Science","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43859326","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: 3

Ensemble Negatively-Charged Nitrogen-Vacancy Centers in Type-Ib Diamond Created by High Fluence Electron Beam Irradiation 高通量电子束辐照制备的Ib型金刚石中带负电的氮空位中心系综

IF 1.4

Quantum Beam Science Pub Date : 2021-12-30 DOI: 10.3390/qubs6010002

Shuya Ishii, Seiichi Saiki, S. Onoda, Y. Masuyama, H. Abe, T. Ohshima

{"title":"Ensemble Negatively-Charged Nitrogen-Vacancy Centers in Type-Ib Diamond Created by High Fluence Electron Beam Irradiation","authors":"Shuya Ishii, Seiichi Saiki, S. Onoda, Y. Masuyama, H. Abe, T. Ohshima","doi":"10.3390/qubs6010002","DOIUrl":"https://doi.org/10.3390/qubs6010002","url":null,"abstract":"Electron beam irradiation into type-Ib diamond is known as a good method for the creation of high concentration negatively-charged nitrogen-vacancy (NV−) centers by which highly sensitive quantum sensors can be fabricated. In order to understand the creation mechanism of NV− centers, we study the behavior of substitutional isolated nitrogen (P1 centers) and NV− centers in type-Ib diamond, with an initial P1 concentration of 40–80 ppm by electron beam irradiation up to 8.0 × 1018 electrons/cm2. P1 concentration and NV− concentration were measured using electron spin resonance and photoluminescence measurements. P1 center count decreases with increasing irradiation fluence up to 8.0 × 1018 electrons/cm2. The rate of decrease in P1 is slightly lower at irradiation fluence above 4.0 × 1018 electrons/cm2 especially for samples of low initial P1 concentration. Comparing concentration of P1 centers with that of NV− centers, it suggests that a part of P1 centers plays a role in the formation of other defects. The usefulness of electron beam irradiation to type-Ib diamonds was confirmed by the resultant conversion efficiency from P1 to NV− center around 12–19%.","PeriodicalId":31879,"journal":{"name":"Quantum Beam Science","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43933909","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: 6