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  • AIP Publishing  (144)
  • 2020-2024  (144)
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  • AIP Publishing  (144)
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  • 2020-2024  (144)
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  • 1
    Online Resource
    Online Resource
    Laser repointing scheme for octahedral spherical hohlraum s on the SGIII laser facility
    AIP Publishing ; 2023
    In:  Physics of Plasmas Vol. 30, No. 4 ( 2023-04-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 30, No. 4 ( 2023-04-01)
    Abstract: The novel octahedral spherical hohlraum can provide an ideal and practical approach for the next generation of laser systems to support both direct and indirect drive to achieve predictable and reproducible fusion gain via multiple schemes. To demonstrate its advantage in a naturally high symmetry at a cylindrically configured laser facility, it requires to repoint the laser beams to approach as close as possible the ideal octahedral beam configuration with an injection angle (the angle between a beam and the normal direction of its laser entrance hole (LEH)) ranging from 50° to 60°. We report our investigation and experiment on the optimum repointing scheme at the SGIII facility, which uses 32 beams, with 8 beams entering each polar LEH at 49.5° and 55°, and 4 beams entering each equatorial LEH at 61.5° and 62.1°. It contains residual imbalance between the polar and equatorial beams, leading to an asymmetry dominated by the spherical harmonic Y20 mode, which can be remarkably reduced by the stronger backscatters of equatorial beams. Our experiment demonstrated the feasibility of the 32-beam optimum repointing scheme and generation of 175 eV under 86 kJ inside a 2.4-mm-radius octahedral hohlraum with 0.7-mm-radius LEHs, which provided a strong support for the later experiment on proof-of-concept of octahedral spherical hohlraum [Lan et al., Phys. Rev. Lett. 127, 245001 (2021)]. 2D simulations on LEH closure agree well with the observations. This work opens a novel way of realization of a quasi-spherical irradiation at a cylindrically configured laser facility without supplementary symmetry control.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/5.0133806
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 1472746-8
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  • 2
    Online Resource
    Online Resource
    Structural, electrical, and thermal features of polyimide composites filled with semiconductive MXene sheets
    AIP Publishing ; 2021
    In:  Applied Physics Letters Vol. 118, No. 26 ( 2021-06-28)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 118, No. 26 ( 2021-06-28)
    Abstract: Polymer-based dielectrics are widely applied in the fields of electronics and electrical power systems due to the high breakdown strength, excellent flexibility, and unique self-healing capability. However, the low stored energy density and unsatisfactory heat management of polymer dielectrics hinder the development of polymer-based film capacitors. In this research, artificial composites with improved capacitive energy storage and thermal conductivity are fabricated by blending the two-dimensional semiconductive MXene sheets with a polyimide (PI) matrix. Remarkably, a PI based composite with 1 wt. % MXene sheets increases its dielectric permittivity from ≈3.27 to ≈3.53 and enhances its discharged energy density from ≈1.93 to ≈2.38 J/cm3 while maintaining its low dielectric loss of & lt;0.02 and relatively high charge–discharge efficiency of & gt;80%. Meanwhile, a high in-plane thermal conductivity of 0.418 W m−1 K−1 is achieved for PI/MXene composites with 5 wt. % MXene. In addition, the distribution of temperature field inside the composites has been investigated by a finite element method. These results represent a strategy in polymer dielectrics to achieve simultaneous high energy density and thermal conductivity, which may also have potential for applications in high temperature environments.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0057451
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 3
    Online Resource
    Online Resource
    Redox-inactive samarium(III) acetylacetonate as dopant enabling cation substitution and interfacial passivation for efficient and stable CsPbI2Br perovskite solar cells
    AIP Publishing ; 2020
    In:  APL Materials Vol. 8, No. 7 ( 2020-07-01)
    Details
    In: APL Materials, AIP Publishing, Vol. 8, No. 7 ( 2020-07-01)
    Abstract: All-inorganic (CsPbX3) perovskites by replacing the volatile organic components with cesium cations allow extending the long-term thermal stability of perovskite solar cells (PeSCs) vs their organic–inorganic hybrid counterparts. However, the stability of α-CsPbI3 and α-CsPbI2Br still remains to be improved. In this work, we incorporate redox-inactive samarium acetylacetonate [Sm(acac)3] into CsPbI2Br to fabricate CsPbI2Br perovskite thin films. It is evidenced that Sm3+ not only partially substitute the Pb2+ sites to yield slightly contracted perovskite lattice but also modulate the perovskite growth and passivate the NiOx/CsPbI2Br interface. As a result, CsPbI2Br PeSCs based on stoichiometric and optimal Sm(acac)3 doping (0.15 mol. %) of CsPbI2Br show excellent photovoltaic metrics with a champion power conversion efficiency (PCE) of 12.86%. Moreover, the CsPbI2Br PeSCs exhibit enhanced thermal stability upon incorporation of Sm(acac)3, which retains 90% of their original PCE under heating at 85 °C for 200 h.
    Type of Medium: Online Resource
    ISSN: 2166-532X
    URL: Article
    DOI: 10.1063/5.0011918
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2722985-3
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  • 4
    Online Resource
    Online Resource
    Enhanced photovoltage for inverted perovskite solar cells using delafossite CuCrO2 hole transport material
    AIP Publishing ; 2022
    In:  Chinese Journal of Chemical Physics Vol. 35, No. 6 ( 2022-12-01), p. 957-964
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 35, No. 6 ( 2022-12-01), p. 957-964
    Abstract: Poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) has been widely adopted as hole transport material (HTM) in inverted perovskite solar cells (PSCs), due to high optical transparency, good mechanical flexibility, and high thermal stability; however, its acidity and hygroscopicity inevitably hamper the long-term stability of the PSCs and its energy level does not match well with perovskite materials with a relatively low open-circuit voltage. In this work, p-type delafossite CuCrO2 nanoparticles synthesized through hydrothermal method was employed as an alternative HTM for triple cation perovskite [(FAPbI3)0.87(MAPbBr3)0.13]0.92(CsPbI3)0.08 (possessing better photovoltaic performance and stability than conventional CH3NH3PbI3) based inverted PSCs. The average open-circuit voltage of PSCs increases from 908 mV of the devices with PEDOT:PSS HTM to 1020 mV of the devices with CuCrO2 HTM. Ultraviolet photoemission spectroscopy demonstrates the energy band alignment between CuCrO2 and perovskite is better than that between PEDOT:PSS and perovskite, the electrochemical impedance spectroscopy indicates CuCrO2-based PSCs exhibit larger recombination resistance and longer charge carrier lifetime than PEDOT:PSS-based PSCs, which contributes to the high VOC of CuCrO2 HTM-based PSCs.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/cjcp2103055
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 5
    Online Resource
    Online Resource
    Broadband composite pulse for quantum sensing with a solid-state spin in diamond
    AIP Publishing ; 2022
    In:  Applied Physics Letters Vol. 120, No. 19 ( 2022-05-09)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 120, No. 19 ( 2022-05-09)
    Abstract: High fidelity quantum operation of qubits plays an important role in realistic quantum sensing. It becomes more challenging when there are inevitable interactions between qubits in the solid system. We employ a composite pulse sequence to deal with the problems. The electron spin state of the nitrogen-vacancy center in diamond is flipped with high fidelity by the composite pulse at room temperature. In contrast with traditional rectangular pulses, the composite pulse has a wider excitation profile at the same Rabi frequency. Hence, the three sublevels of host nitrogen nuclear spin can be flipped efficiently and simultaneously, which enhances the signal contrast and detection sensitivity of quantum sensing universally. The enhancement effect works over a wide range of bias magnetic fields. Our scheme can be used for sensing temperature, strain, and electric field and can be applied to other spin–spin coupling systems.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0084665
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Highly efficient and stable blue photoluminescence from environmental-friendly double perovskites
    AIP Publishing ; 2023
    In:  Applied Physics Letters Vol. 122, No. 11 ( 2023-03-13)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 122, No. 11 ( 2023-03-13)
    Abstract: Despite intensive explorations, lead-free, low toxicity, efficient, and stable blue fluorescent materials are still highly desirable. Cs2NaInCl6 double perovskite (DP) is considered as a promising candidate for solid-state lighting due to its low toxicity and good stability. In this work, Mg-doped Cs2NaInCl6 DPs are prepared by a solvothermal method. The Mg2+-doped Cs2NaInCl6 DPs exhibit blue photoluminescence (PL) at about 445 nm with a full-width at half maximum of 58.0 nm, which is independent of the excitation wavelength. The large Stokes shift (129.5 nm), long PL lifetime (10.44 μs), and huge Huang–Rhys factor (40.2) suggest that the blue PL originates from self-trapped excitons. After optimizing the reaction conditions and doping concentration, a high photoluminescence quantum yield of 86.98% is obtained. Moreover, the Mg-doped Cs2NaInCl6 DPs exhibit good resistance to irradiation and moisture, which are expected to remedy the shortage of current blue emitting materials.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0137866
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 7
    Online Resource
    Online Resource
    An actively compensated 8 nT-level magnetic shielding system for 10-m atom interferometer
    AIP Publishing ; 2021
    In:  Review of Scientific Instruments Vol. 92, No. 8 ( 2021-08-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 92, No. 8 ( 2021-08-01)
    Abstract: We design and develop a high-performance magnetic shielding system for a long baseline fountain-type atom interferometer. The shielding system is achieved by a combination of passive shielding using permalloy and active compensation with coils. An 11.4 m-long three-layer cylindrical shield is completed by the process of welding, local annealing, and entire annealing. The active compensations compress the residual magnetic field to 8.0 nT max-to-min and the corresponding gradient below 30 nT/m over 10 m along the axial direction in which external compensation, internal compensation, and constant magnetic field (C-field) compensation reduce the inhomogeneities to 25.0, 12.6, and 1.7 nT (standard deviation) sequentially. We estimate that this system could reduce the systematic error of the quadratic Zeeman shift to the 10−13 level for the weak equivalence principle test with a simultaneous 85Rb–87Rb dual-species atom interferometer.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/5.0053971
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 8
    Online Resource
    Online Resource
    Multi-keV x-ray radiator from titanium cylindrical cavity at the Shenguang-III prototype laser facility
    AIP Publishing ; 2021
    In:  Physics of Plasmas Vol. 28, No. 6 ( 2021-06-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 28, No. 6 ( 2021-06-01)
    Abstract: Great efforts have been made to create a bright K-shell source using the thin metal cylindrical cavities in the past few decades. Several metal materials such as titanium (Ti), iron, and so on have been tested for high x-ray conversion efficiency mainly at the OMEGA and NIF laser facilities. Recently, x-ray sources in Ti K-shell transition energy range were investigated at the Shenguang-III prototype laser facility with ∼5 kJ laser energy. The experiments were aimed to reproduce the previous ones at OMEGA, but with an extraordinarily small volume of cylindrical cavity and detailed characterizations of the x-ray source. The cavities were 800 μm inner diameter, 800 μm length, and 30 μm thick plastic tubes supporting 1 μm thick Ti. Seven laser beams were focused to 200 μm diameter. The combination of the small cavity volume and the focused laser spots is intended to improve the electron temperature with limited laser energy since the electron temperature is a key issue for high x-ray conversion efficiency. Thomson scattering was adopted to experimentally probe the electron temperatures at special time and space zones as well as the average temperature obtained from the Ti K-shell spectrum. The evolutions of the electron temperature and density are predicted by the radiation hydrodynamic simulation. A top view and two photon energy bands of x-ray source images provide a way to directly observe the plasma movement toward the cavity axis and distinguish the different emission mechanisms between the Ti K-shell and lower energy x rays. Six Higher-energy x-ray detectors located at different angles were used to record the Ti K-shell x-ray emission and demonstrate its isotropic feature. The characteristics of the x-ray radiate intensity including the time evolution, the angular distribution, and the total yields for both the photon energy regions above and below 4 keV are compared between the cavity and planar targets. Obviously, different behaviors were found between the two photon energy regions and the two types of targets. The x-ray conversion efficiency of the Ti cylinder was determined to be ∼4% and ∼21% in 4π sr in the Ti K-shell (4–7 keV) and  & lt;4 keV range, respectively. The Ti K-shell conversion efficiency obtained in the present experiments is between the ones driven by 13.5 and 4.5 kJ laser energy at OMEGA.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/5.0033096
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 1472746-8
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  • 9
    Online Resource
    Online Resource
    Self-driven photodetector based on a GaSe/MoSe2 selenide van der Waals heterojunction with the hybrid contact
    AIP Publishing ; 2020
    In:  Applied Physics Letters Vol. 117, No. 16 ( 2020-10-19)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 117, No. 16 ( 2020-10-19)
    Abstract: The restacking of stripped two-dimensional material into a van der Waals heterojunction provides a promising technology for high-performance optoelectronic devices. This paper presents a self-driven photodetector composed of p-GaSe/n-MoSe2. The hybrid contact is directly formed between the electrode and the heterojunction, which considerably improves the photovoltaic effect. In addition, the Schottky barrier between the semiconductor and metal electrodes creates a built-in electric field, which enhances the self-driven performance of the device. The as-fabricated photodetector has the high responsivity of 0.169 A W−1 at zero bias and the specific detectivity of 6.6 × 1011 Jones. When bias was applied, a responsivity of 6.81 A W−1 and a specific detectivity of 2.8 × 1013 Jones have also been obtained. This work demonstrates that selenide van der Waals heterojunctions based on two-dimensional materials have great potential for future electronic and optoelectronic applications.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0020771
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 10
    Online Resource
    Online Resource
    Investigation of the role of fishbone activity in the formation of internal transport barrier in HL-2A plasma
    AIP Publishing ; 2022
    In:  Physics of Plasmas Vol. 29, No. 10 ( 2022-10-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 29, No. 10 ( 2022-10-01)
    Abstract: A tokamak scenario with q(0) close to 1 has been achieved on HL-2A tokamak, which is an internal transport barrier (ITB) at low central shear or a steady-state ITB combined with an H-mode edge barrier. In this scenario, the formation of an ITB with a steep ion temperature profile is observed to be closely linked to the q = 1 magnetic surface and magnetohydrodynamic (MHD) activities around it, such as long-lived mode (LLM) or fishbone activities. Experimental evidence and simulation analysis suggest that the fishbone activities can induce a poloidal flow, which is beneficial for the suppression of turbulence in the plasma core region. Furthermore, an application of central electron cyclotron resonance heating (ECRH) to such beam-heated weak shear ITB discharges leads to a substantial effect on central MHD stability, converting the LLM into fishbone activity and hence enhancing the strength of the ITB with a much stronger gradient. Moreover, ITBs in combination with an H-mode barrier were achieved for 10 confinement times with βN = 2.0.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/5.0093432
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 1472746-8
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