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  • AIP Publishing  (145)
  • 2015-2019  (145)
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  • AIP Publishing  (145)
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  • 2015-2019  (145)
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  • 1
    Online Resource
    Online Resource
    Fluorescence based imaging for M-band drive symmetry measurement in hohlraum
    AIP Publishing ; 2016
    In:  Physics of Plasmas Vol. 23, No. 11 ( 2016-11-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 23, No. 11 ( 2016-11-01)
    Abstract: We describe an experimental technique to measure the drive symmetry of M-band radiation on the capsule in hohlraum. M-band radiation from the corona of the laser-produced gold plasma, especially the laser spot regions in the cavity, was used to pump x-ray fluorescence of a thin layer of Si-tracer coated on a solid CH-ball. The fluorescence images were time resolvedly recorded by an x-ray framing camera and the drive asymmetry due to M-band radiation was deduced from these fluorescence images. Moreover, a Si-doped gold cavity was used with the initial purpose of maximizing the fluorescence signal through resonance transitions. Since the Si-plasma expands more rapidly than the gold-plasma, the evolution of drive asymmetry was accelerated in Si-doped hohlraum.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.4968519
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 1472746-8
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  • 2
    Online Resource
    Online Resource
    Investigation on laser plasma instability of the outer ring beams on SGIII laser facility
    AIP Publishing ; 2019
    In:  AIP Advances Vol. 9, No. 9 ( 2019-09-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 9, No. 9 ( 2019-09-01)
    Abstract: In order to study the laser plasma instabilities (LPIs) in the context of some novel six-side laser-driven indirect designs like the six-cylinder-port hohlraum and the three-axis cylindrical hohlraum, where the laser beams inject in hohlraum with a large angle. LPI experiments in cylindrical hohlraum with only outer beams were designed and performed based on the current laser arrangement condition of SGIII laser facility for the first time. Stimulated Brillouin backscatter (SBS) was found to be the dominant instability with high instantaneous reflectivity in experiments. A typical feature was obtained in the time-resolved spectra of SBS, which maintained similar for different laser intensities of the interaction beam. The experimental data are analyzed by the hydrodynamic simulations combined with HLIP code, which is based on the ray-tracing model. By analysis of experimental data, it is argued that the mixture of gas and Au in the region of their interface is important to SBS, which indicates the need for the mixture model between the filled gas and the high Z plasma from hohlraum wall in the hydrodynamic simulations. Nonlinear saturation of SBS as well as the smoothed beam are also discussed here. Our effective considerations of the ions pervasion effect and the smoothed beam provide utilitarian ways for improvement of the current ray-tracing method.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5087936
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2583909-3
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  • 3
    Online Resource
    Online Resource
    Electric field control of exchange-spring behavior
    AIP Publishing ; 2015
    In:  Journal of Applied Physics Vol. 117, No. 12 ( 2015-03-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 117, No. 12 ( 2015-03-28)
    Abstract: We study the electric field control of exchange-spring (ES) behavior in a piezoelectric/ES multi-layer using the micromagnetic simulation method. In the composite, PZT or PZN-PT forms the piezoelectric substrate, while the ES bilayer is composed of hard-magnetic (HM) CoFe2O4 (CFO) and soft-magnetic (SM) Fe3O4 or Co43Fe43B14 materials. The stress as a function of electric-field strength (E) and the external magnetic field was set to align in plane. The results reveal an E-sensitive magnetic property in the PZN-PT/Co43Fe43B14/CFO system. The ES bilayer in this system experienced a transition from rigid magnetism to ES behavior with E changing from 2 MV/m to −2 MV/m. The E-related nucleation field and switching field exhibit strong dependences on the thickness ratio between the HM and SM phases. Additionally, when the magnetic field was applied at an acute angle to the easy axis of the HM or the SM phase, a multi-jump hysteresis loop was observed under a negative E bias. These results may be attributed to a change in the effective magnetic anisotropy constant resulting from the transfer of stress from the piezoelectric substrate to the ES bilayer under an electric field.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4916242
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 4
    Online Resource
    Online Resource
    New two-dimensional space-resolving flux detection technique for measurement of hohlraum inner radiation in Shenguang-III prototype
    AIP Publishing ; 2015
    In:  Review of Scientific Instruments Vol. 86, No. 10 ( 2015-10-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 86, No. 10 ( 2015-10-01)
    Abstract: The space-resolving measurement of X-ray flux from a specific area (laser spot, re-emitting wall, or capsule) inside the hohlraum is an ongoing and critical problem in indirectly driven inertial-confinement fusion experiments. In this work, we developed a new two-dimensional space-resolving flux detection technique to measure the X-ray flux from specific areas inside the hohlraum by using the time- and space-resolving flux detector (SRFD). In two typical hohlraum experiments conducted at the Shenguang-III prototype laser facility, the X-ray flux and radiation temperature from an area 0.2 mm in diameter inside the hohlraum were measured through the laser entrance hole (LEH). The different flux intensities and radiation temperatures detected using the SRFD from the inner area of the LEH were compared with the result measured using the flat-response X-ray detector from the entire LEH. This comparison was also analyzed theoretically. The inner area detected using the SRFD was found to be the re-emitting wall area alone. This important improvement in space-resolving X-ray flux measurement will enhance the current X-ray flux space characterization techniques, thereby furthering the quantitative understanding of X-ray flux space behavior in the hohlraum.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.4934250
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 5
    Online Resource
    Online Resource
    A multichannel visible spectroscopy system for the ITER-like W divertor on EAST
    AIP Publishing ; 2017
    In:  Review of Scientific Instruments Vol. 88, No. 4 ( 2017-04-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 88, No. 4 ( 2017-04-01)
    Abstract: To facilitate long-pulse high power operation, an ITER-like actively cooled tungsten (W) divertor was installed in Experimental Advanced Superconducting Tokamak (EAST) to replace the original upper graphite divertor in 2014. A dedicated multichannel visible spectroscopic diagnostic system has been accordingly developed for the characterization of the plasma and impurities in the W divertor. An array of 22 lines-of-sight (LOSs) provides a profile measurement of the light emitted from the plasma along upper outer divertor, and the other 17 vertical LOSs view the upper inner divertor, achieving a 13 mm poloidal resolution in both regions. The light emitted from the plasma is collected by a specially designed optical lens assembly and then transferred to a Czerny-Turner spectrometer via 40 m quartz fibers. At the end, the spectra dispersed by the spectrometer are recorded with an Electron-Multiplying Charge Coupled Device (EMCCD). The optical throughput and quantum efficiency of the system are optimized in the wavelength range 350-700 nm. The spectral resolution/coverage can be adjusted from 0.01 nm/3 nm to 0.41 nm/140 nm by switching the grating with suitable groove density. The frame rate depends on the setting of LOS number in EMCCD and can reach nearly 2 kHz for single LOS detection. The light collected by the front optical lens can also be divided and partly transferred to a photomultiplier tube array with specified bandpass filter, which can provide faster sampling rates by up to 200 kHz. The spectroscopic diagnostic is routinely operated in EAST discharges with absolute optical calibrations applied before and after each campaign, monitoring photon fluxes from impurities and H recycling in the upper divertor. This paper presents the technical details of the diagnostic and typical measurements during EAST discharges.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.4979406
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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    Online Resource
  • 6
    Online Resource
    Online Resource
    Demonstration of low energy proton radiography on an 11-MeV cyclotron
    AIP Publishing ; 2016
    In:  Review of Scientific Instruments Vol. 87, No. 11 ( 2016-11-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 87, No. 11 ( 2016-11-01)
    Abstract: Lens focused proton radiograph on thin objects is demonstrated using an 11-MeV proton cyclotron at China Academy of Engineering Physics. The proton beam exiting from the tested objects is focused onto the image plane by a magnetic lens system mitigating image blur caused by multiple Coulomb scattering. Both simulations and experiments show that clear images can be obtained with a lens system for the objects with thickness up to 2.7 × 10−2 g/cm2 and the error for the areal density measurement is measured to be less than 2.3%. For the objects with thickness between 2.7 × 10−3 g/cm2 and 2.7 × 10−2 g/cm2, 100–200 μm of spatial resolution is achieved.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.4967459
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 7
    Online Resource
    Online Resource
    First experimental comparisons of laser-plasma interactions between spherical and cylindrical hohlraums at SGIII laser facility
    AIP Publishing ; 2017
    In:  Matter and Radiation at Extremes Vol. 2, No. 2 ( 2017-03-01), p. 77-86
    Details
    In: Matter and Radiation at Extremes, AIP Publishing, Vol. 2, No. 2 ( 2017-03-01), p. 77-86
    Abstract: We present our recent laser-plasmas instability (LPI) comparison experiment at the SGIII laser facility between the spherical and cylindrical hohlraums. Three kinds of filling are considered: vacuum, gas-filling with or without a capsule inside. A spherical hohlraum of 3.6 mm in diameter, and a cylindrical hohlraum of 2.4 mm × 4.3 mm are used. The capsule diameter is 0.96 mm. A flat-top laser pulse with 3 ns duration and up to 92.73 kJ energy is used. The experiment has shown that the LPI level in the spherical hohlraum is close to that of the outer beam in the cylindrical hohlraum, while much lower than that of the inner beam. The experiment is further simulated by using our 2-dimensional radiation hydrodynamic code LARED-Integration, and the laser back-scattering fraction and the stimulated Raman scatter (SRS) spectrum are post-processed by the high efficiency code of laser interaction with plasmas HLIP. According to the simulation, the plasma waves are strongly damped and the SRS is mainly developed at the plasma conditions of electron density from 0.08 nc to 0.1 nc and electron temperature from 1.5 keV to 2.0 keV inside the hohlraums. However, obvious differences between the simulation and experiment are found, such as that the SRS back-scattering is underestimated, and the numerical SRS spectrum peaks at a larger wavelength and at a later time than the data. These differences indicate that the development of a 3D radiation hydrodynamic code, with more accurate physics models, is mandatory for spherical hohlraum study.
    Type of Medium: Online Resource
    ISSN: 2468-2047 , 2468-080X
    URL: Article
    DOI: 10.1016/j.mre.2017.01.001
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 2858469-7
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  • 8
    Online Resource
    Online Resource
    Progress in optical Thomson scattering diagnostics for ICF gas-filled hohlraums
    AIP Publishing ; 2019
    In:  Matter and Radiation at Extremes Vol. 4, No. 5 ( 2019-09-01)
    Details
    In: Matter and Radiation at Extremes, AIP Publishing, Vol. 4, No. 5 ( 2019-09-01)
    Abstract: Optical Thomson scattering (OTS) diagnostics have been continuously developed on a series of large laser facilities for inertial confinement fusion (ICF) research in China. We review recent progress in the use of OTS diagnostics to study the internal plasma conditions of ICF gas-filled hohlraums. We establish the predictive capability for experiments by calculating the time-resolved Thomson scattering spectra based on the 2D radiation-hydrodynamic code LARED, and we explore the fitting method for the measured spectra. A typical experiment with a simplified cylindrical hohlraum is conducted on a 10 kJ-level laser facility, and the plasma evolution around the laser entrance hole is analyzed. The dynamic effects of the blast wave from the covering membrane and the convergence of shocks on the hohlraum axis are observed, and the experimental results agree well with those of simulations. Another typical experiment with an octahedral spherical hohlraum is conducted on a 100 kJ-level laser facility, and the plasma evolution at the hohlraum center is analyzed. A discrepancy appears between experiment and simulation as the electron temperature rises, indicating the occurrence of nonlocal thermal conduction.
    Type of Medium: Online Resource
    ISSN: 2468-2047 , 2468-080X
    URL: Article
    DOI: 10.1063/1.5090971
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2858469-7
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  • 9
    Online Resource
    Online Resource
    First demonstration of improving laser propagation inside the spherical hohlraums by using the cylindrical laser entrance hole
    AIP Publishing ; 2016
    In:  Matter and Radiation at Extremes Vol. 1, No. 1 ( 2016-01-01), p. 2-7
    Details
    In: Matter and Radiation at Extremes, AIP Publishing, Vol. 1, No. 1 ( 2016-01-01), p. 2-7
    Abstract: The octahedral spherical hohlraums have natural superiority in maintaining high radiation symmetry during the entire capsule implosion process in indirect drive inertial confinement fusion. While, in contrast to the cylindrical hohlraums, the narrow space between the laser beams and the spherical hohlraum wall is usually commented. In this Letter, we address this crucial issue and report our experimental work conducted on the SGIII-prototype laser facility which unambiguously demonstrates that a simple design of cylindrical laser entrance hole (LEH) can dramatically improve the laser propagation inside the spherical hohlraums. In addition, the laser beam deflection in the hohlraum is observed for the first time in the experiments. Our 2-dimensional simulation results also verify qualitatively the advantages of the spherical hohlraums with cylindrical LEHs. Our results imply the prospect of adopting the cylindrical LEHs in future spherical ignition hohlraum design.
    Type of Medium: Online Resource
    ISSN: 2468-2047 , 2468-080X
    URL: Article
    DOI: 10.1016/j.mre.2016.02.001
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 2858469-7
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  • 10
    Online Resource
    Online Resource
    Direct-drive cryogenic-target implosion experiments on SGIII prototype laser facility
    AIP Publishing ; 2015
    In:  Physics of Plasmas Vol. 22, No. 4 ( 2015-04-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 22, No. 4 ( 2015-04-01)
    Abstract: Directly driven cryogenic target implosion experiments are performed on the SGIII prototype laser facility. X-ray pinhole images reveal frozen condensation on the sealing film. The influence of the condensation on the delivery of laser energy to the capsule surface is then quantified experimentally. It is found that, with a carefully chosen pre-pulse duration, the influence can be reduced, and the neutron yield is increased by an order of magnitude. Subsequently, the cryogenic layered capsule and cryogenic gas-filled capsule are imploded using 6.5-kJ laser energy. The implosion performance is characterized by the neutron yield, the 2D self-emission images of the in-flight shell, and the primary proton spectrum. The neutron yield is 2 × 107 for the gas-filled capsule and 2.8 × 107 for the layered capsule. The 2D self-emission images of the in-flight shell exhibit significant implosion asymmetry. The energy downshift of the proton spectrum is used to infer the areal density. For the gas-filled capsule, the spectrum is downshifted by 0.1 MeV, yielding an areal density of 1–3 mg/cm2. For the layered capsule, the spectrum is downshifted by 0.5 MeV, yielding an areal density of 4–6 mg/cm2. Improving the implosion symmetry would help to further increase the areal density.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.4917329
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 1472746-8
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