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  • 1
    Digitale Medien
    Digitale Medien
    Structural modification of ion-implanted and postannealed polycrystalline diamond studied by transmission electron microscopy (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 1465-1468 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have presented a convenient and effective method to ex situ study ion-implanted and postannealed polycrystalline diamond by transmission electron microscopy (TEM) without thinning the specimens. Chemical-vapor-deposited (CVD) diamond used for transmission electron microscopy study was directly deposited onto Mo TEM grids, and then implanted and postannealed. TEM images clearly reveal that there exists an ion-induced amorphous layer on the as-implanted CVD diamond surface, in which graphitelike structure is embedded. The amorphization processes depend on the irradiation conditions. Hydrogen plasma treatment was employed to anneal the as-implanted CVD diamond. High resolution electron microscopy images indicate that hydrogen plasma treatment can effectively remove the ion-induced surface amorphous layer without graphitizing the diamond. After treatment, high density ball-like diamond blisters appear on the surface, of which the average diameter is only about 2.5 nm, implying the critical size for the stable existence of CVD diamond crystallites may be on the order of a few atomic layers. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.363014
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  • 2
    Digitale Medien
    Digitale Medien
    High electron mobility in the selectively doped heterostructures grown by normal pressure metalorganic chemical vapor deposition (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 334-337 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: GaAs/AlGaAs heterostructure selectively doped with Si was grown in a conventional normal pressure metalorganic chemical vapor deposition using trimethyl metals and arsine. Mobility of the two-dimensional electron gas as high as 8100, 148 000, and 401 000 cm2/V s was obtained at 300, 77, and 5 K, respectively, for a sample with an undoped Al0.3Ga0.7As spacer layer of 100 A(ring) and with a sheet electron density of about 5×1011 cm−2. The heterostructure with the spacer layer thinner than 100 A(ring) shows high mobility comparable to the best values obtained by molecular-beam epitaxy. The influence of growth parameters on the electron mobility in the heterostructure is described in detail.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.337648
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  • 3
    Digitale Medien
    Digitale Medien
    Optical properties of (AlAs)n(GaAs)n superlattices grown by metalorganic chemical vapor deposition (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 2691-2695 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Optical properties were investigated on the superlattices with a unit lattice period of (AlAs)n(GaAs)n (n=1–24) which were grown by atmospheric-pressure metalorganic chemical vapor deposition. Raman spectroscopy indicated that superlattice structure is realized for each n without collapsing into alloys. Photoluminescence measurement indicated that the ultrathin-layer superlattice (with n larger than 2) has a direct energy gap, which is in good agreement with a tight-binding calculation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.335905
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  • 4
    Digitale Medien
    Digitale Medien
    Shock Hugoniot compression curve for water up to 1 GPa by using a compressed gas gun (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 476-482 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A shock Hugoniot compression curve for water has been measured up to less than 1 GPa. A plane and steady shock wave is produced in water by the flat plate impact of a projectile accelerated by a compressed gas gun. A new experimental procedure was proposed to detect the shock wave front sensitively, which makes it possible to measure shock Hugoniot in higher precision than the previous method. The present method is based on the very large pressure dependence of the refractive index of water upon compression. By using this method, the shock compression curve was determined within the precision of 2% to 3% of the estimated shock pressure. The precision is better than that of the previous data. It was confirmed that within the pressure range covered in this experiment, the shock-particle velocity Hugoniot can be described by a linear relation with a large slope. Shock Hugoniot states on the pressure–temperature plane were calculated by using the obtained Hugoniot data combined with the values of thermodynamical variables. Thermodynamic analysis of the shock compression process was developed to estimate the contributions of irreversible heating by shock compression. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1421630
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  • 5
    Digitale Medien
    Digitale Medien
    Sensitive optical detection of the shock front and fast moving surface for shock study in condensed media in the 1 GPa stress region (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 1730-1734 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Based on the light extinction of total internal reflection by triangular prisms, very sensitive detection of the shock front and fast moving free surface has been demonstrated for 1 GPa shock waves in polymers. This is the first experimental verification of the feasibility of the inclined-prism technique for the relatively low shock stress region, which was originally proposed and used by Eden and Wright for obtaining the high-explosive generated shock Hugoniot of several condensed materials. The present method has the advantage that it only requires closing the gap between the free surface of the target and the reflected surface of the prisms. The feasibility and the limitation of the method have been discussed both theoretically and experimentally. A typical streak photograph for a PMMA specimen is shown to compare with the published data. It is seen that the present method is very sensitive for shock arrival detection even in the 1 GPa shock stress region. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1148833
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  • 6
    Digitale Medien
    Digitale Medien
    Improved interferometer for measuring unsteady film thickness (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 2685-2690 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: An interferometer previously developed for measuring instantaneous film thickness of the order of 10 μm–1 mm [T. Ohyama, K. Endoh, A. Mikami, and Y. H. Mori, Rev. Sci. Instrum. 59, 2018 (1988)] has been improved with respect to both facility of handling and accuracy of thickness determination. The improved version of the interferometer uses an expanded laser beam focused aslant on the subject film. The rays reflected from the front and rear surfaces of the film form interference fringes on a screen, which are then recorded in the form of a single snapshot interferogram or as a set of serial interferograms to be geometrically analyzed. Experiments with thin glass plates as sample films verified the expected advantages of the new version over the original one. The improved version of the interferometer was also tested on a liquid film asymptotically thinning as it drained down a vertical plate. The test indicated that the accuracy and precision of the new improved version far exceed those of other transient film-thickness measuring techniques. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1147095
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  • 7
    Digitale Medien
    Digitale Medien
    Longitudinal impedance tuner using new material FINEMET (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 2988-2992 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: We designed an impedance tuner consisting of an inductive material, FINEMET, to cancel the space charge impedance in the longitudinal direction. It was installed in the KEK Proton Synchrotron (PS) main ring. We observed the frequency shift of the coherent quadrupole oscillations and inferred the shift of the incoherent synchrotron oscillation. The total reactive impedance can be estimated as the coefficient between the shift and the beam intensity. The measured impedance is reduced from −j2475Ω to −j1182Ω by the impedance tuner which consists of 12 pieces of FINEMET cores. We demonstrated that the space charge impedance is compensated by the impedance tuner. This is the first time for FINEMET to be equipped with an accelerator component. One may think that the characteristics of FINEMET deteriorate under an environment with strong radiation generated by unavoidable beam loss. We have proved that the radiation dose not affect FINEMET even with a total neutron dose of 1.83×1012(n cm−2), which is considered to be the highest dose of the main ring. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1149859
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  • 8
    Digitale Medien
    Digitale Medien
    A 2.45 GHz microwave negative hydrogen ion source : The 8th international conference on ion sources (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 1042-1044 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A 2.45 GHz microwave plasma sputter-type of negative hydrogen ion source has been developed at KEK. The microwave discharge was produced by a 2.45 GHz microwave source. In this ion source, negative hydrogen ions are produced at the surface of a molybdenum converter electrode which is placed in a hydrogen plasma confined by a cusp magnetic field. In preliminary experiments, a H− beam current was obtained in pulsed mode operation (0.2 ms, 20 Hz). Impurities (O− and OH−) of 27% in the total negative ion beam current were observed. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1150381
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  • 9
    Digitale Medien
    Digitale Medien
    Production of polarized negative deuterium ion beam with dual optical pumping : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1362-1364 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: To obtain a highly nuclear-spin vector polarized negative deuterium ion beam, a dual optically pumped polarized negative deuterium ion source has been developed at KEK. It is possible to select a pure nuclear-spin state with this scheme, and a negative deuterium ion beam with 100% nuclear-spin vector polarization can be produced in principle. Thus far, we have obtained about 70% of the nuclear-spin vector polarized negative deuterium ion beam. This result may open up new possibilities for the optically pumped polarized ion source. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1146667
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  • 10
    Digitale Medien
    Digitale Medien
    Plasma sputter multicusp negative/positive ion source with ECR discharge : Proceedings of fifth international conference on ion sources (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1223-1225 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A plasma sputter type of negative and positive ion source with electron cyclotron resonance (ECR) discharge has been developed at KEK. The ECR discharge was produced by a 2.45 GHz microwave source. In this ion source, negative heavy ions are produced at the surface of the metal which is placed in a Xe gas plasma confined in a cusp magnetic field. Positive ions are generated by ionizing of sputtered neutral atoms in the ECR discharge. The microwave is introduced into the source through a sputter target using a waveguide type of microwave transformer.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1145013
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