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  • AIP Publishing  (390)
  • Li, J.  (390)
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  • AIP Publishing  (390)
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  • 1
    Online Resource
    Online Resource
    Studies of laser-plasma interaction physics with low-density targets for direct-drive inertial confinement fusion on the Shenguang III prototype
    AIP Publishing ; 2021
    In:  Matter and Radiation at Extremes Vol. 6, No. 2 ( 2021-03-01)
    Details
    In: Matter and Radiation at Extremes, AIP Publishing, Vol. 6, No. 2 ( 2021-03-01)
    Abstract: The physics of laser-plasma interaction is studied on the Shenguang III prototype laser facility under conditions relevant to inertial confinement fusion designs. A sub-millimeter-size underdense hot plasma is created by ionization of a low-density plastic foam by four high-energy (3.2 kJ) laser beams. An interaction beam is fired with a delay permitting evaluation of the excitation of parametric instabilities at different stages of plasma evolution. Multiple diagnostics are used for plasma characterization, scattered radiation, and accelerated electrons. The experimental results are analyzed with radiation hydrodynamic simulations that take account of foam ionization and homogenization. The measured level of stimulated Raman scattering is almost one order of magnitude larger than that measured in experiments with gasbags and hohlraums on the same installation, possibly because of a greater plasma density. Notable amplification is achieved in high-intensity speckles, indicating the importance of implementing laser temporal smoothing techniques with a large bandwidth for controlling laser propagation and absorption.
    Type of Medium: Online Resource
    ISSN: 2468-2047 , 2468-080X
    URL: Article
    DOI: 10.1063/5.0023006
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2858469-7
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Critical current and flux pinning near T c of a YBa2Cu3O7 thin film
    AIP Publishing ; 1991
    In:  Journal of Applied Physics Vol. 70, No. 4 ( 1991-08-15), p. 2461-2463
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 70, No. 4 ( 1991-08-15), p. 2461-2463
    Abstract: The voltage V versus current I of a high-quality YBa2Cu3O7−x thin film with zero-resistance temperature equal to 90.8 K was measured at temperatures near Tc (85, 87, and 90 K, respectively) under different magnetic fields (0–7 T). A significant result is that the critical-current density of the film reached 1.37×104 A/cm2 (zero field) even at 90 K, implying that strong pinning centers exist in our sample. However, a small applied magnetic field will diminish the critical-current densities remarkably. The pinning-force densities are found to follow Kramer’s scaling law in both perpendicular and parallel directions of the magnetic fields to the c axis of the film. A possible influence of thermally activated flux creep on the pinning mechanism is confirmed.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.349400
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1991
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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    Online Resource
  • 3
    Online Resource
    Online Resource
    SrB4O7:Sm2+ fluorescence improves the accuracy of temperature measurements in externally heated diamond anvil cells
    AIP Publishing ; 2022
    In:  Review of Scientific Instruments Vol. 93, No. 12 ( 2022-12-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 93, No. 12 ( 2022-12-01)
    Abstract: The sample temperature in an externally heated diamond anvil cell (EHDAC) is generally measured by a thermocouple fixed to the pavilions of diamond anvils, ignoring the temperature difference between the thermocouple and the sample. However, the measured temperature depends strongly on the placement of the thermocouple, thus seriously reducing the accuracy of the temperature measurement and hindering the use of EHDAC in experiments requiring precise temperature measurements, such as high-pressure melting and phase-diagram investigations. In this study, the full width at half maximum (FWHM) of the 0–0 fluorescence line of strontium borate doped with bivalent samarium ions (SrBO4:Sm2+, SBO) is found to be highly sensitive to temperature and responds extremely rapidly to small temperature fluctuations, which makes it an excellent temperature indicator. We propose herein a precise method to measure temperature that involves measuring the FWHM of the 0–0 fluorescence line of SBO. This method is used to correct the temperature discrepancy between the thermocouple and the sample in an EHDAC. These corrections significantly improve the accuracy of temperature measurements in EHDACs. The accuracy of this method is verified by measuring the melting point of tin at ambient pressure. We also use this method to produce a tentative elementary phase diagram of tin up to 109 GPa and 495 K. This method facilitates high-pressure, high-temperature experiments demanding accurate temperature measurements in various disciplines. The study also discusses, in general, the experimental approach to measuring temperature.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/5.0099000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Long-pulse high-performance H-mode plasmas achieved on EAST
    AIP Publishing ; 2023
    In:  Physics of Plasmas Vol. 30, No. 6 ( 2023-06-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 30, No. 6 ( 2023-06-01)
    Abstract: A record duration of a 310 s H-mode plasma (H98y2 ∼ 1.3, ne/nGW ∼ 0.7, fBS & gt; 50%) has been recently achieved on experimental advanced superconducting tokamak (EAST) with metal walls, exploiting the device's improved long-pulse capabilities. The experiment demonstrates good control of tungsten concentration, core/edge MHD stability, and particle and heat exhaust with an ITER-like tungsten divertor and zero injected torque, establishing a milestone on the path to steady-state long-pulse high-performance scenarios in support of ITER and CFETR. Important synergistic effects are leveraged toward this result, which relies purely on radio frequency (RF) powers for heating and current drive (H & CD). On-axis electron cyclotron heating enhances the H & CD efficiency from lower hybrid wave injection, increasing confinement quality and enabling fully non-inductive operation at high density (ne/nGW ∼ 70%) and high poloidal beta (βP ∼ 2.5). A small-amplitude grassy edge localized mode regime facilitates the RF power coupling to the H-mode edge and reduces divertor sputtering/erosion. The high energy confinement quality (H98y2 ∼ 1.3) is achieved with the experimental and simulated results pointing to the strong effect of Shafranov shift on turbulence. Transport analysis suggests that trapped electron modes dominate in the core region during the record discharge. The detailed physics processes (RF synergy, core-edge integration, confinement properties, etc.) of the steady-state operation will be illustrated in the content. In the future, EAST will aim at accessing more relevant dimensionless parameters to develop long-pulse high-performance plasma toward ITER and CFETR steady-state advanced operation.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/5.0146690
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 1472746-8
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    Online Resource
  • 5
    Online Resource
    Online Resource
    Nonlinear current-voltage behavior and giant positive magnetoresistance in nonmagnetic Au/Yttria-stabilized zirconia/Si heterostructures
    AIP Publishing ; 2009
    In:  Applied Physics Letters Vol. 95, No. 24 ( 2009-12-14)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 95, No. 24 ( 2009-12-14)
    Abstract: We report on the nonlinear current-voltage (I-V) behavior and giant positive magnetoresistance (GPMR) in the Au/Yttria-stabilized zirconia/Si heterostructures. The I-V curves of the heterostructures show a rectifying property and follow the Fowler–Nordheim tunneling behavior for the larger forward bias voltages. The GPMR of the samples increases with decreasing temperature and exceeds 100 000% in a magnetic field of 7 T at 20 K with a voltage of +4 V. It also shows anisotropy with magnetoresistance for the magnetic field perpendicular to the current larger than that of the parallel case. A possible mechanism was proposed to account for the results.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3274130
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Fast electron flux driven by lower hybrid wave in the scrape-off layer
    AIP Publishing ; 2015
    In:  Physics of Plasmas Vol. 22, No. 2 ( 2015-02-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 22, No. 2 ( 2015-02-01)
    Abstract: The fast electron flux driven by Lower Hybrid Wave (LHW) in the scrape-off layer (SOL) in EAST is analyzed both theoretically and experimentally. The five bright belts flowing along the magnetic field lines in the SOL and hot spots at LHW guard limiters observed by charge coupled device and infrared cameras are attributed to the fast electron flux, which is directly measured by retarding field analyzers (RFA). The current carried by the fast electron flux, ranging from 400 to 6000 A/m2 and in the direction opposite to the plasma current, is scanned along the radial direction from the limiter surface to the position about 25 mm beyond the limiter. The measured fast electron flux is attributed to the high parallel wave refractive index n|| components of LHW. According to the antenna structure and the LHW power absorbed by plasma, a broad parallel electric field spectrum of incident wave from the antennas is estimated. The radial distribution of LHW-driven current density is analyzed in SOL based on Landau damping of the LHW. The analytical results support the RFA measurements, showing a certain level of consistency. In addition, the deposition profile of the LHW power density in SOL is also calculated utilizing this simple model. This study provides some fundamental insight into the heating and current drive effects induced by LHW in SOL, and should also help to interpret the observations and related numerical analyses of the behaviors of bright belts and hot spots induced by LHW.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.4908542
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 1472746-8
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    Online Resource
  • 7
    Online Resource
    Online Resource
    Thermally activated dissipation and critical field H c 2 in c -oriented high- T c Bi-Pb-Sr-Ca-Cu-O thin film
    AIP Publishing ; 1991
    In:  Journal of Applied Physics Vol. 69, No. 8 ( 1991-04-15), p. 4379-4383
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 69, No. 8 ( 1991-04-15), p. 4379-4383
    Abstract: A set of resistivity-temperature (R-T) curves measured under various applied fields in a high-Tc Bi-Pb-Sr-Ca-Cu-O thin film which has a zero-resistance temperature Tc0 of 110 K is reported. The remarkable broadening of the transition width is discussed under the flux-creep model, considering the very short coherence length of this oxide superconductor. The resistivity is thermally activated, which is consistent with the Arrhenius law with a magnetic field and orientation-dependent activation energy U0(H,Θ). The U0(H,Θ) has a very high value of 381.6 meV under a field of 0.1 T parallel to the c axis. The upper critical field Hc2 determined from these R-T curves shows high values and the effect of flux creep to the Hc2(0) is examined by the irreversible behavior with the ‘‘giant’’ flux-creep model.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.348362
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1991
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 8
    Online Resource
    Online Resource
    Predissociation of the Na2 4 3Σg+ state
    AIP Publishing ; 1998
    In:  The Journal of Chemical Physics Vol. 108, No. 18 ( 1998-05-08), p. 7707-7712
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 108, No. 18 ( 1998-05-08), p. 7707-7712
    Abstract: The Na2 4 3Σg+ state dissociates adiabatically to the 3s+4p atomic limit. The vibrational levels of the 4 3Σg+ state below the 3s+3d atomic limit were observed previously by perturbation facilitated optical–optical double resonance (PFOODR) fluorescence excitation spectroscopy. Vibrational levels above the 3s+3d atomic limit are found to be predissociated and transitions into these levels have been observed by detecting atomic Na 3d→3p fluorescence. The predissociation is due to the interaction with the continuum of the 2 3Πg state (direct as well as accidental predissociation via bound vibrational levels of the 3 3Πg state). The potential energy curve of the 4 3Σg+ state has been constructed.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.476206
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1998
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 9
    Online Resource
    Online Resource
    Any-polar resistive switching behavior in LATP films
    AIP Publishing ; 2019
    In:  Applied Physics Letters Vol. 115, No. 14 ( 2019-09-30)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 115, No. 14 ( 2019-09-30)
    Abstract: We demonstrate the coexistence and conversion of the unipolar and bipolar resistive switching behavior in Pt/Li1+xAlxTi2−x(PO4)3 (LATP)/Pt structures fabricated by sputtering. The dielectric constant (k) of the LATP film equals 12.0. After the electroforming, the Pt/LATP/Pt resistive switching device exhibits either unipolar switching mode (URS) or bipolar switching mode (BRS). The switching mode can be freely converted between URS and BRS with the same compliance current. This will provide a foundation for a switching mode called any-polar switching mode. The switching mechanism is believed to be related to the formation and rupture of conductive filaments and the excellent oxygen storage capacitance of the LATP film.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5114860
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 10
    Online Resource
    Online Resource
    Magnetostructural coupling and magnetocaloric effect in Ni–Mn–In
    AIP Publishing ; 2009
    In:  Applied Physics Letters Vol. 95, No. 17 ( 2009-10-26)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 95, No. 17 ( 2009-10-26)
    Abstract: Magnetic-field-induced martensitic phase transition and the concomitant change of volume are investigated in Ni–Mn–In alloy. A well-defined linear relationship is found between the quantity characterizing magnetic degree of freedom and the thermal expansion on behalf of structural degree of freedom, which demonstrates the magnetostructural coupling. Within the exchange-inversion model, such a linear relationship is theoretically derived and the magnetostructural correlation is elucidated. The lattice-entropy change contributes about one half of the total entropy change, suggesting that the magnetostructural coupling plays an important role in the magnetocaloric effect of Ni–Mn–In alloy.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3257381
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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