The European Physical Journal D最新文献_第3页

GRASIAN: shaping and characterization of the cold hydrogen and deuterium beams for the forthcoming first demonstration of gravitational quantum states of atoms GRASIAN：为即将进行的原子引力量子态首次演示塑造冷氢和氘束并确定其特征

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2024-10-29 DOI: 10.1140/epjd/s10053-024-00916-5

Carina Killian, Philipp Blumer, Paolo Crivelli, Otto Hanski, Daniel Kloppenburg, François Nez, Valery Nesvizhevsky, Serge Reynaud, Katharina Schreiner, Martin Simon, Sergey Vasiliev, Eberhard Widmann, Pauline Yzombard

{"title":"GRASIAN: shaping and characterization of the cold hydrogen and deuterium beams for the forthcoming first demonstration of gravitational quantum states of atoms","authors":"Carina Killian, Philipp Blumer, Paolo Crivelli, Otto Hanski, Daniel Kloppenburg, François Nez, Valery Nesvizhevsky, Serge Reynaud, Katharina Schreiner, Martin Simon, Sergey Vasiliev, Eberhard Widmann, Pauline Yzombard","doi":"10.1140/epjd/s10053-024-00916-5","DOIUrl":"10.1140/epjd/s10053-024-00916-5","url":null,"abstract":"<div><p>A low energy particle confined by a horizontal reflective surface and gravity settles in gravitationally bound quantum states. These gravitational quantum states (GQS) were so far only observed with neutrons. However, the existence of GQS is predicted also for atoms. The GRASIAN collaboration pursues the first observation of GQS of atoms, using a cryogenic hydrogen beam. This endeavor is motivated by the higher densities, which can be expected from hydrogen compared to neutrons, the easier access, the fact that GQS were never observed with atoms and the accessibility to hypothetical short-range interactions. In addition to enabling gravitational quantum spectroscopy, such a cryogenic hydrogen beam with very low vertical velocity components—a few cm <span>(hbox {s}^-1)</span>, can be used for precision optical and microwave spectroscopy. In this article, we report on our methods developed to reduce background and to detect atoms with a low horizontal velocity, which are needed for such an experiment. Our recent measurement results on the collimation of the hydrogen beam to 2 mm, the reduction of background and improvement of signal-to-noise and finally our first detection of atoms with velocities <span>(<{72},hbox {ms}{^-1})</span> are presented. Furthermore, we show calculations, estimating the feasibility of the planned experiment and simulations which confirm that we can select vertical velocity components in the order of cm <span>(hbox {s}^-1)</span>.</p></div>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"78 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjd/s10053-024-00916-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142524515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wideband and ultra-low confinement loss nested hollow-core anti-resonant fiber with double-single-layer structures 宽带和超低禁锢损耗嵌套中空纤芯抗谐振双单层结构光纤

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2024-10-29 DOI: 10.1140/epjd/s10053-024-00926-3

Erlei Wang, Qiang Wang, Quan Cheng, Xiaodong Zhou

{"title":"Wideband and ultra-low confinement loss nested hollow-core anti-resonant fiber with double-single-layer structures","authors":"Erlei Wang, Qiang Wang, Quan Cheng, Xiaodong Zhou","doi":"10.1140/epjd/s10053-024-00926-3","DOIUrl":"10.1140/epjd/s10053-024-00926-3","url":null,"abstract":"<div><p>To further reduce the confinement loss of hollow-core anti-resonant fibers (HC-ARFs), broaden the low-loss operating bandwidth, and decrease the bending losses, this paper proposes a novel double-single-layer nested HC-ARF. The influence of structural parameters on its optical performance is analyzed using the full-vector finite element method, and the relevant structural parameters are optimized accordingly. The results indicate that, after optimizing the structural parameters, the HC-ARF exhibits extremely low confinement loss (on the order of 10<sup>–8</sup> dB/km) at the wavelength of 1.55 μm. When the bending radius is 10 cm, the bending loss is also very low (on the order of 10<sup>–4</sup> dB/km), which demonstrates an excellent bend-resistant property. Moreover, the HC-ARF possesses a very flat dispersion characteristic, with a low-loss operating bandwidth of approximately 945 nm, covering all the communication bands (O + E + S + C + L band).</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>Cross section of the proposed double-single-layer nested HC-ARF and its Performance under the optimized structural parameters. This paper presents a new type of hollow - core anti - resonant fiber. The optical properties of this fiber, including confinement loss, bending loss and dispersion, etc., are numerically calculated by using the full-vector finite-element method. On this basis, the structural parameters of the fiber are optimized, and excellent optical properties are finally obtained.</p></div></div></figure></div></div>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"78 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540661","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

Applications of atomic data to studies of the Sun 原子数据在太阳研究中的应用

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2024-10-21 DOI: 10.1140/epjd/s10053-024-00915-6

Peter R. Young

{"title":"Applications of atomic data to studies of the Sun","authors":"Peter R. Young","doi":"10.1140/epjd/s10053-024-00915-6","DOIUrl":"10.1140/epjd/s10053-024-00915-6","url":null,"abstract":"<p>The Sun is a standard reference object for astrophysics and also a fascinating subject of study in its own right. X-ray and extreme ultraviolet movies of the Sun’s atmosphere show an extraordinary diversity of plasma phenomena, from barely visible bursts and jets to coronal mass ejections that impact a large portion of the solar surface. The processes that produce these phenomena, heat the corona and power the solar wind remain actively studied and accurate atomic data are essential for interpreting observations and making model predictions. For the Sun’s interior intense effort is focused on resolving the “solar problem,” (a discrepancy between solar interior models and helioseismology measurements) and atomic data are central to both element abundance measurements and interior physics such as opacity and nuclear reaction rates. In this article, topics within solar interior and solar atmosphere physics are discussed and the role of atomic data described. Areas of active research are highlighted and specific atomic data needs are identified.</p><p>An image of a solar active region obtained with the 193 A channel of SDO/AIA, showing plasma at around 1.5 million degrees.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"78 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjd/s10053-024-00915-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancement of longitudinal magnetic field by interaction of heavy ion beams and plasma with strong magnetic field 重离子束和等离子体与强磁场相互作用增强纵向磁场

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2024-10-21 DOI: 10.1140/epjd/s10053-024-00922-7

Heng Zhang, Fei-Fei Li, Fang-Ping Wang, Wen-Shan Duan, Sheng Zhang, Liang-Wen Chen

{"title":"Enhancement of longitudinal magnetic field by interaction of heavy ion beams and plasma with strong magnetic field","authors":"Heng Zhang, Fei-Fei Li, Fang-Ping Wang, Wen-Shan Duan, Sheng Zhang, Liang-Wen Chen","doi":"10.1140/epjd/s10053-024-00922-7","DOIUrl":"10.1140/epjd/s10053-024-00922-7","url":null,"abstract":"<p>The interaction between ion beams and plasma is a fundamental and important physical process, plasma can effectively neutralize the current and charge of ion beam pulses as an ideal medium for its transmission and focusing. The analytical model of short heavy ion beam pulse in cold background plasma under external magnetic field is established. Combined with the experimental parameters, by 2.5D particle-in-cell numerical simulations, the entire transport process of heavy ion beam application strong magnetic fields in plasma is investigated. Our research results indicate that the interaction between short-pulse heavy ion beams and plasma generates a longitudinally induced magnetic field in the same direction as the external magnetic field. Moreover, the electron cyclotron electromagnetic waves of anti-parallel to local magnetic field are excited, and the excitation mechanism is mainly drift instability of electrons beam caused by the heavy ion beam.</p><p>Temporal variations of the longitudinal induced magnetic field Bz in plasma and vacuum regions under different external magnetic fields</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"78 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453114","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

Non-equilibrium delocalization–localization transition of photons in two coupled microwave cavities 两个耦合微波腔中光子的非平衡脱焦-定位转变

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2024-10-21 DOI: 10.1140/epjd/s10053-024-00921-8

Zhuang-Zhuang Meng, Lei Liu, Lei Tan

引用次数: 0

Investigating the influence of ionization on high-harmonic generation in Ar–Ne and Ar–Kr gas mixtures driven by kHz laser pulses 研究电离对千赫激光脉冲驱动的 Ar-Ne 和 Ar-Kr 气体混合物中高次谐波产生的影响

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2024-10-19 DOI: 10.1140/epjd/s10053-024-00924-5

S. Chintalwad, B. Ramakrishna, Lap Van Dao

{"title":"Investigating the influence of ionization on high-harmonic generation in Ar–Ne and Ar–Kr gas mixtures driven by kHz laser pulses","authors":"S. Chintalwad, B. Ramakrishna, Lap Van Dao","doi":"10.1140/epjd/s10053-024-00924-5","DOIUrl":"10.1140/epjd/s10053-024-00924-5","url":null,"abstract":"<div><p>We conducted a study on high-harmonic generation (HHG) in mixed gases, specifically Ar–Ne or Ar–Kr, with the aim of investigating the impact of ionization rate and neutral dispersion on the HHG process. Our focus was on understanding how these factors influence the HHG process when using gases with low and high ionization potentials. Based on phase-matched high-order harmonic generation in pure Ar gas, our investigation shows that the influence of plasma dispersion and neutral dispersion can be varied independently in mixed gas while the laser intensity is kept constant. Our results reveal that the addition of low ionization potential gases, such as Kr, to the Ar gas leads to a more rapid reduction in phase matching, due to the strong effects of ionization. The observed experimental outcomes align well with our theoretical calculations. This study provides valuable insights into the interplay of ionization rate and neutral dispersion in high-harmonic generation and the special requirement of the controlling of laser intensity for phase-matched harmonic generation. The findings contribute to a deeper understanding of the underlying dynamics and offer practical considerations for optimizing HHG properties.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"78 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142451073","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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Above-threshold ionization by a strong circularly polarized laser pulse assisted by a terahertz pulse 太赫兹脉冲辅助强圆偏振激光脉冲的阈上电离

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2024-10-19 DOI: 10.1140/epjd/s10053-024-00920-9

D. Agačević, N. Ibrišimović, D. Škrgić, D. B. Milošević

引用次数: 0

Modified Le Sech wavefunction for investigating confined two-electron atomic systems 用于研究约束双电子原子系统的修正勒塞赫波函数

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2024-10-18 DOI: 10.1140/epjd/s10053-024-00918-3

Rabeet Singh, Arup Banerjee

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Dynamic effective charge in the continuum final state in the CDW-EIS model: ionisation of molecules by bare-ion impact CDW-EIS 模型中连续最终态的动态有效电荷：裸离子撞击下的分子电离

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2024-10-17 DOI: 10.1140/epjd/s10053-024-00904-9

M. F. Rojas, M. A. Quinto, R. D. Rivarola, J. M. Monti

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Photo double-ionization of CO2 studied by photoelectron-photoelectron coincidence experiments at 20 eV excess energy in equal energy sharing conditions 在等能量共享条件下，通过 20 eV 过剩能量下的光电子-光电子重合实验研究二氧化碳的光双电离现象

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2024-10-15 DOI: 10.1140/epjd/s10053-024-00917-4

Giorgio Turri, Paola Bolognesi, Lorenzo Avaldi

{"title":"Photo double-ionization of CO2 studied by photoelectron-photoelectron coincidence experiments at 20 eV excess energy in equal energy sharing conditions","authors":"Giorgio Turri, Paola Bolognesi, Lorenzo Avaldi","doi":"10.1140/epjd/s10053-024-00917-4","DOIUrl":"10.1140/epjd/s10053-024-00917-4","url":null,"abstract":"<div><p>The Triple-Differential Cross Section (TDCS) for the Photo Double-Ionization of carbon dioxide molecule to the CO<sub>2</sub><sup>2+</sup> X<sup>3</sup> Σ<sub>g</sub><sup>−</sup> ground state has been measured at 20 eV excess energy. In the experiment the coincidence angular distributions of the two photoelectrons, where the direction of one photoelectron has been fixed at 0, 30 and 60° with respect to the direction of the polarization of the incident radiation, have been measured for a condition where the two photoelectrons equally share the excess energy. Care has been taken to perform the measurements with an energy resolution which enabled to isolate the TDCS of the X<sup>3</sup>Σ<sup>−</sup><sub>g</sub> ground state of the dication. An appreciable contribution to TDCS at a relative angle θ<sub>12</sub> = 180° has been observed and attributed to a favorite symmetry of the wavefunction of the two ejected electrons.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div><p>TDCS of CO<sub>2</sub> measures at photon energy 57.7eV, θ<sub>1</sub>=0, 30 and 60° and equal energy sharing of 10 eV are reported as black dots. Panels (a) and (c) report the TDCS as calculated by Alwan et al. (J Phys B: At Mol Opt Phys 48:185203, 2015) using the charge in the Sommerfeld parameters for the oxygen atom of 0.2 (black full curve) and 0.8 (ref full curve). The blue full curve in panels (d)-(f) is the fit to the experiments with the helium=like model by Reddsih and Feaging (J Phys B: At Mol Opt Phys 32:2473, 1999).</p></div>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"78 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434764","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