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  • AIP Publishing  (4)
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  • AIP Publishing  (4)
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  • 1
    Online-Ressource
    Online-Ressource
    Electromagnetic diagnostic system for the Keda Torus eXperiment
    AIP Publishing ; 2017
    In:  Review of Scientific Instruments Vol. 88, No. 9 ( 2017-09-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 88, No. 9 ( 2017-09-01)
    Kurzfassung: A system for electromagnetic measurements was designed and installed on the Keda Torus eXperiment (KTX) reversed field pinch device last year. Although the unique double-C structure of the KTX, which allows the machine to be opened easily without disassembling the poloidal field windings, makes the convenient replacement and modification of the internal inductive coils possible, it can present difficulties in the design of flux coils and magnetic probes at the two vertical gaps. Moreover, the KTX has a composite shell consisting of a 6 mm stainless steel vacuum chamber and a 1.5 mm copper shell, which results in limited space for the installation of saddle sensors. Therefore, the double-C structure and composite shell should be considered, especially during the design and installation of the electromagnetic diagnostic system (EDS). The inner surface of the vacuum vessel includes two types of probes. One type is for the measurement of the global plasma parameters, and the other type is for studying the local behavior of the plasma and operating the new saddle coils. In addition, the probes on the outer surface of the composite shell are used for measurements of eddy currents. Finally, saddle sensors for radial field measurements for feedback control were installed between the conducting shell and the vacuum vessel. The entire system includes approximately 1100 magnetic probes, 14 flux coils, 4×26×2 saddle sensors, and 16 Rogowski coils. Considering the large number of probes and limited space available in the vacuum vessel, the miniaturization of the probes and optimization of the probe distribution are necessary. In addition, accurate calibration and careful mounting of the probes are also required. The frequency response of the designed magnetic probes is up to 200 kHz, and the resolution is 1 G. The EDS, being spherical and of high precision, is one of the most basic and effective diagnostic tools of the KTX and meets the demands imposed by requirements on basic machine operating information and future studies.
    Materialart: Online-Ressource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.5003039
    Sprache: Englisch
    Verlag: AIP Publishing
    Publikationsdatum: 2017
    ZDB Id: 209865-9
    ZDB Id: 1472905-2
    SSG: 11
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    The eddy current probe array for Keda Torus eXperiment
    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)
    Kurzfassung: In a reversed field pinch device, the conductive shell is placed as close as possible to the plasma so as to balance the plasma during discharge. Plasma instabilities such as the resistive wall mode and certain tearing modes, which restrain the plasma high parameter operation, respond closely with conditions in the wall, in essence the eddy current present. Also, the effect of eddy currents induced by the external coils cannot be ignored when active control is applied to control instabilities. One diagnostic tool, an eddy current probe array, detects the eddy current in the composite shell. Magnetic probes measuring differences between the inner and outer magnetic fields enable estimates of the amplitude and angle of these eddy currents. Along with measurements of currents through the copper bolts connecting the poloidal shield copper shells, we can obtain the eddy currents over the entire shell. Magnetic field and eddy current resolutions approach 2 G and 6 A, respectively. Additionally, the vortex electric field can be obtained by eddy current probes. As the conductivity of the composite shell is high, the eddy current probe array is very sensitive to the electric field and has a resolution of 0.2 mV/cm. In a bench test experiment using a 1/4 vacuum vessel, measurements of the induced eddy currents are compared with simulation results based on a 3D electromagnetic model. The preliminary data of the eddy currents have been detected during discharges in a Keda Torus eXperiment device. The typical value of toroidal and poloidal eddy currents across the magnetic probe coverage rectangular area could reach 3.0 kA and 1.3 kA, respectively.
    Materialart: Online-Ressource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.4966988
    Sprache: Englisch
    Verlag: AIP Publishing
    Publikationsdatum: 2016
    ZDB Id: 209865-9
    ZDB Id: 1472905-2
    SSG: 11
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 3
    Online-Ressource
    Online-Ressource
    Fabrication of patternable Janus transition-metal dichalcogenides assisted by electron beam irradiation
    AIP Publishing ; 2022
    In:  Applied Physics Letters Vol. 120, No. 22 ( 2022-05-30)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 120, No. 22 ( 2022-05-30)
    Kurzfassung: Two-dimensional Janus transition metal dichalcogenides exhibit intrinsic out-of-plane structural symmetry breaking, which facilitates their applications in spintronics through the enhanced Rashba spin–orbit coupling. Fabrication of Janus structures in a deterministic fashion is essential for their practical heterogeneous integration, which, however, remains challenging in the aspect of material synthesis technology. Here, we demonstrate a synthetic strategy to fabricate Janus WSSe structures at definite positions on its tungsten disulfide (WS2) host through the local electron beam irradiation followed by controllable selenization. We show that the energetic electron flux can significantly modulate the WS2 lattice properties, which locally increase the energy barrier between the WS2 and its Janus counterpart WSSe, thus preventing the irradiated WS2 from being selenized and creating well-defined hetero-boundaries. Moreover, by using monolayer and bilayer WS2 as the hosts, both lateral and vertical heterostructures of WSSe–WS2 can be achieved in a patternable manner. Our work provides a viable route toward the controllable fabrication of the Janus structures for multi-functional spintronics.
    Materialart: Online-Ressource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0095650
    RVK:
    UA 1000
    Sprache: Englisch
    Verlag: AIP Publishing
    Publikationsdatum: 2022
    ZDB Id: 211245-0
    ZDB Id: 1469436-0
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 4
    Online-Ressource
    Online-Ressource
    Determination of plasma displacement based on eddy current diagnostics for the Keda Torus eXperiment
    AIP Publishing ; 2017
    In:  Physics of Plasmas Vol. 24, No. 10 ( 2017-10-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 24, No. 10 ( 2017-10-01)
    Kurzfassung: The measurement of plasma displacement is one of the most basic diagnostic tools in the study of plasma equilibrium and control in a toroidal magnetic confinement configuration. During pulse discharge, the eddy current induced in the vacuum vessel and shell will produce an additional magnetic field at the plasma boundary, which will have a significant impact on the measurement of plasma displacement using magnetic probes. In the newly built Keda Torus eXperiment (KTX) reversed field pinch device, the eddy current in the composite shell can be obtained at a high spatial resolution. This device offers a new way to determine the plasma displacement for KTX through the multipole moment expansion of the eddy current, which can be obtained by unique probe arrays installed on the inner and outer surfaces of the composite shell. In an ideal conductor shell approximation, the method of multipole moment expansion of the poloidal eddy current for measuring the plasma displacement in toroidal coordinates, is more accurate than the previous method based on symmetrical magnetic probes, which yielded results in cylindrical coordinates. Through an analytical analysis of many current filaments and numerical simulations of the current distribution in toroidal coordinates, the scaling relation between the first moment of the eddy current and the center of gravity of the plasma current is obtained. In addition, the origin of the multipole moment expansion of the eddy current in KTX is retrieved simultaneously. Preliminary data on the plasma displacement have been collected using these two methods during short pulse discharges in the KTX device, and the results of the two methods are in reasonable agreement.
    Materialart: Online-Ressource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.4996546
    Sprache: Englisch
    Verlag: AIP Publishing
    Publikationsdatum: 2017
    ZDB Id: 1472746-8
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
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