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  • 1
    Online Resource
    Online Resource
    A 200-W permanent magnet Hall thruster discharge with graphite channel wall
    Elsevier BV ; 2018
    In:  Physics Letters A Vol. 382, No. 42-43 ( 2018-10), p. 3079-3082
    Details
    In: Physics Letters A, Elsevier BV, Vol. 382, No. 42-43 ( 2018-10), p. 3079-3082
    Type of Medium: Online Resource
    ISSN: 0375-9601
    URL: Article
    DOI: 10.1016/j.physleta.2018.08.017
    RVK:
    UA 1000 ; UA 6580.A
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2018
    detail.hit.zdb_id: 1466603-0
    detail.hit.zdb_id: 208865-4
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  • 2
    Online Resource
    Online Resource
    Experimental test of 200 W Hall thruster with titanium wall
    IOP Publishing ; 2017
    In:  Japanese Journal of Applied Physics Vol. 56, No. 5 ( 2017-05-01), p. 050312-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 56, No. 5 ( 2017-05-01), p. 050312-
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.7567/JJAP.56.050312
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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  • 3
    Online Resource
    Online Resource
    Effects of annular-cylindrical combined channel Hall thruster length on the discharge characteristics
    American Vacuum Society ; 2018
    In:  Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena Vol. 36, No. 6 ( 2018-11-01)
    Details
    In: Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena, American Vacuum Society, Vol. 36, No. 6 ( 2018-11-01)
    Abstract: In order to increase the degree of ionization and improve the efficiency, the effects of different cylindrical outer wall lengths on the discharge characteristics of the annular-cylindrical combined channel Hall thruster are studied. The cylindrical outer wall is set to the following positions: 95% (with positive magnetic field gradient), and 100%, 95%, 90%, 75%, and 50% (with negative magnetic field gradient) of the maximum magnetic field. The ionization gain and wall energy loss under different positions are analyzed through numerical simulations. The simulation result shows that when the cylindrical outer wall is set to the position where it is 100%–90% of the maximum magnetic field (negative magnetic field gradient zone), the power deposition on the channel wall is small, the propellant utilization can be largely improved, and the comprehensive performance is optimal for the annular-cylindrical combined channel Hall thruster.
    Type of Medium: Online Resource
    ISSN: 2166-2746 , 2166-2754
    URL: Article
    DOI: 10.1116/1.5037740
    RVK:
    UA 4922
    Language: English
    Publisher: American Vacuum Society
    Publication Date: 2018
    detail.hit.zdb_id: 3117331-7
    detail.hit.zdb_id: 1475429-0
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  • 4
    Online Resource
    Online Resource
    Effect of magnetic field directionality on discharging characteristics of Hall effect thruster with azimuthal diversion rail
    American Vacuum Society ; 2018
    In:  Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena Vol. 36, No. 6 ( 2018-11-01)
    Details
    In: Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena, American Vacuum Society, Vol. 36, No. 6 ( 2018-11-01)
    Abstract: The structure of an azimuthal diversion rail causes the neutral gas in the Hall effect thruster to possess a certain circumferential velocity. Two different directions of the magnetic field can be formed in the discharge channel, where the direction of the magnetic field depends on the direction of the excitation current. The aim of this work is to study the effect of magnetic field directionality on the discharging characteristics of a Hall effect thruster with an azimuthal diversion rail. The experimental results demonstrate that a change in the magnetic field direction corresponds to a change in the electronic Hall drift direction. When the electronic Hall drift direction is opposite to the circumferential velocity of the neutral gas, its thrust, specific impulse, and efficiency are higher than the case in which the electronic Hall drift direction is in the same direction as that of the circumferential velocity of neutral gas. The increase in performances is due to the increase in the propellant utilization. The reasons for the increase in the propellant utilization are explained. The experimental result provides a guide for the selection of the direction of excitation current of the Hall effect thruster with an azimuthal diversion rail.
    Type of Medium: Online Resource
    ISSN: 2166-2746 , 2166-2754
    URL: Article
    DOI: 10.1116/1.5037215
    RVK:
    UA 4922
    Language: English
    Publisher: American Vacuum Society
    Publication Date: 2018
    detail.hit.zdb_id: 3117331-7
    detail.hit.zdb_id: 1475429-0
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  • 5
    Online Resource
    Online Resource
    Study of the catastrophic discharge phenomenon in a Hall thruster
    Elsevier BV ; 2017
    In:  Physics Letters A Vol. 381, No. 40 ( 2017-10), p. 3482-3486
    Details
    In: Physics Letters A, Elsevier BV, Vol. 381, No. 40 ( 2017-10), p. 3482-3486
    Type of Medium: Online Resource
    ISSN: 0375-9601
    URL: Article
    DOI: 10.1016/j.physleta.2017.09.002
    RVK:
    UA 1000 ; UA 6580.A
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2017
    detail.hit.zdb_id: 1466603-0
    detail.hit.zdb_id: 208865-4
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  • 6
    Online Resource
    Online Resource
    Nanofocusing of longitudinally polarized light using absorbance modulation
    AIP Publishing ; 2014
    In:  Applied Physics Letters Vol. 104, No. 6 ( 2014-02-10)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 104, No. 6 ( 2014-02-10)
    Abstract: Recently, many methods based on amplitude or phase modulation to reduce the focal spot and enhance the longitudinal field component of a tight-focused radially polarized light beam have been suggested. But they all suffer from spot size limit 0.36λ/NA and large side lobes strength in longitudinal component. Here, we report a method of generating a tighter focused spot by focusing radially polarized and azimuthally polarized beams of different wavelengths on a thin photochromic film through a high-numerical-aperture lens simultaneously. In this method, by suppressing the radial component and compressing the longitudinal component of radially polarized beam, absorbance modulation makes the ultimate spot size break the size limit of 0.36λ/NA with side-lobe intensity of longitudinal component below 1% of central-peak intensity. The theoretical analysis and simulation demonstrate that the focal spot size could be smaller than 0.1λ with nearly all radial component blocked at high intensity ratio of the two illuminating beams.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4864775
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 7
    Online Resource
    Online Resource
    Active steering of omni-droplets on slippery cross-scale arrays by bi-directional vibration
    AIP Publishing ; 2023
    In:  Applied Physics Letters Vol. 122, No. 17 ( 2023-04-24)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 122, No. 17 ( 2023-04-24)
    Abstract: Directed droplet manipulation is paramount in various applications, including chemical micro-reaction and biomedical analysis. The existing strategies include some kinds of gradients (structure, inherent wettability, and charge density), whereas they suffer from several limitations, such as low velocity, limited volume range, poor durability, and inefficient environmental suitability. Moreover, active bi-directional reversal of omni-droplets remains challenging because one kind of microstructure at a single scale cannot acquire two kinds of net results of mechanical interaction. Herein, we report an active and directional steering of omni-droplets utilizing bi-directional (vertical and horizontal) vibration on slippery cross-scale structures consisting of macro millimeter-scale circular arc arrays and micro/nanometer-scale slant ratchet arrays, which are fabricated by femtosecond laser patterned oblique etching and lubricant infusion. The physical mechanism of active droplet steering lies in the relative competition between the forces under vertical and horizontal vibration, which mainly arise from the circular arc arrays and slant ratchet arrays, respectively. Various steering modes, including climbing and programmable manipulation, can be realized. Our work is applicable to a wide range of potential applications, including circuit on/off and droplet-based chemical micro-reaction, particularly in the field of high-throughput omni-droplets operation.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0146217
    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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  • 8
    Online Resource
    Online Resource
    Radial position effects of externally mounted hollow cathode on a magnetically shielded Hall thruster
    AIP Publishing ; 2022
    In:  Applied Physics Letters Vol. 121, No. 26 ( 2022-12-26)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 121, No. 26 ( 2022-12-26)
    Abstract: A magnetically shielded Hall thruster (MSHT) has a significantly longer service life than a conventional unshielded Hall thruster (USHT) as it shifts the magnetic field of maximum strength from the channel interior to the exterior. In this study, it was experimentally determined that the influence of the radial position of an externally mounted hollow cathode on the performance of an MSHT is quite different from that of a USHT. The measured plasma parameters demonstrate that in addition to the coupling voltage loss and plume divergence loss, the electron cross-field transport loss (not considered previously and introduced by the outward shifting of the magnetic field) is also important to explaining the performance variation in the MSHT. This study refines the coupling theory between the cathode and Hall thruster and provides a valuable reference for determining the radial position of an externally mounted hollow cathode in an MSHT.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0129741
    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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  • 9
    Online Resource
    Online Resource
    Study on breathing mode oscillation suppression of self-excited Hall thrusters
    American Vacuum Society ; 2012
    In:  Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films Vol. 30, No. 6 ( 2012-11-01)
    Details
    In: Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, American Vacuum Society, Vol. 30, No. 6 ( 2012-11-01)
    Abstract: It is found that the breathing mode oscillation of the discharge current is suppressed notably in a Hall thruster operating with the electromagnets driven in series by the discharge current. In order to study the physical mechanism of this suppression, the ionization distribution is measured experimentally and the spatiotemporal features of the ionization front motion are studied numerically with a one-dimensional quasineutrality hydrodynamic model. Results show that the ionization front motion is restricted in a small range due to the closed-loop feedback control of the magnetic field. The steady-state ionization distribution is narrow and condensed when the electromagnetic coils connect in series with the discharge circuit. The different magnetic field excitation accompanied by different ionization characteristics is the main reason for the suppression of the discharge-current low-frequency breathing mode oscillation.
    Type of Medium: Online Resource
    ISSN: 0734-2101 , 1520-8559
    URL: Article
    DOI: 10.1116/1.4758788
    RVK:
    UA 4921
    Language: English
    Publisher: American Vacuum Society
    Publication Date: 2012
    detail.hit.zdb_id: 1475424-1
    detail.hit.zdb_id: 797704-9
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  • 10
    Online Resource
    Online Resource
    Measurement method for plume divergence angle of Hall thrusters
    American Vacuum Society ; 2019
    In:  Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena Vol. 37, No. 1 ( 2019-01-01)
    Details
    In: Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena, American Vacuum Society, Vol. 37, No. 1 ( 2019-01-01)
    Abstract: High-energy ions in the plume of Hall thrusters can affect a spacecraft by sputtering, deposition contamination, or deflection torque. Thus, the plume divergence angle is an important aspect to evaluate for the application of Hall thrusters. Because of the variation in the plume divergence angle measurement with different measuring radii when the arc measurement method is adopted, a torus-source model was established in this study for error analysis. This variation, because of the different gyration radii, was analyzed, and a corresponding correction method was proposed. In addition, the accuracy and scope of the arc measurement method were improved.
    Type of Medium: Online Resource
    ISSN: 2166-2746 , 2166-2754
    URL: Article
    DOI: 10.1116/1.5037440
    RVK:
    UA 4922
    Language: English
    Publisher: American Vacuum Society
    Publication Date: 2019
    detail.hit.zdb_id: 3117331-7
    detail.hit.zdb_id: 1475429-0
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