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  • 2000-2004  (16)
  • 1995-1999  (41)
  • 1980-1984  (9)
  • 1
    Digitale Medien
    Digitale Medien
    Intense beam production from RIKEN 18 GHz ECRIS and liquid He free SC-ECRISs : Papers from the Ninth International Conference on Ion Sources (2002)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 73 (2002), S. 513-515 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Intense beams of heavy ions with medium charge states (1.3 mA of Ar8+, 200 μA of Xe20+) have been produced from a RIKEN 18 GHz electron cyclotron resonance ion source (ECRIS) using various kinds of techniques, e.g., utilization of an aluminum cylinder and a biased disk, and optimization of the plasma electrode position. Furthermore, we have recently constructed two superconducting ECRISs (operational frequencies of 14 and 18 Hz) which have unique characteristics, i.e., they do not need liquid He to obtain the superconductivity of solenoid coils and utilize the G–M refrigerator instead. These sources are suitable to generate intense beams of heavy ions with very high charge states. We obtained 10 μA of Xe30+, 5 μA of Xe33+, and 1.5 μA of Xe36+ at a radio frequency power of 700 W (14 GHz microwave) without using the gas mixing method. Through various experiments, we confirmed that not only the magnetic field strength and microwave power but also the characteristics of the plasma chamber surface play the essential role for the production of highly charged heavy ions. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1429314
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  • 2
    Digitale Medien
    Digitale Medien
    Production of intense beams of highly charged metallic ions from RIKEN 18 GHz electron cyclotron resonance ion source : Proceedings of the 7th international conference on ion sources (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 637-639 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: We successfully produced intense beams of highly charged metallic ions from various kinds of organic metallic compounds by the metal ions from volatile compounds method and solid materials in RIKEN 18 GHz electron cyclotron resonance ion source (ECRIS) (e.g., 135 eμA of Fe11+, 80 eμA of Fe13+, 10 eμA of Os29+, and 1 eμA of Os37+). Using this ECRIS the ion confinement time of highly charged ions was determined under the pulsed mode operation. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1148534
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  • 3
    Digitale Medien
    Digitale Medien
    Construction and beam experiment of a compact storage ring at MELCO : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1968-1970 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A compact storage ring has been developed for industrial research such as x-ray lithography and material analysis. This machine is of a racetrack type with two superconducting bending magnets and only two normal conducting quadrupole magnets. The circumference is as short as 9.2 m. One quadrupole magnet per cell contributes to making the smaller machine. The injector is a synchrotron, and a full energy injection of 600 MeV is performed. The bending magnets excite a field of 3.5 T, and are operated in a persistent current mode. A decrease in a coil current is ΔI/I〈3×10−3/year. The helium consumption is as low as 2 l/h for two magnets. An iron shield of the magnet decreases a leakage flux to a terrestrial level at a point 3 m from the magnet. A beam current of 380 mA has been stored with no beam instability in spite of there being no correction of the chromaticities. Beam emittances were obtained from measured beam sizes and were in good agreement with calculated values. The coupling coefficient εy/εx is calculated as around 0.04. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1145772
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  • 4
    Digitale Medien
    Digitale Medien
    Effect of plasma chamber surface for production of highly charged ions from ECRIS : Papers from the Ninth International Conference on Ion Sources (2002)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 73 (2002), S. 611-613 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The effect of the surface of Al2O3 on the beam intensity of highly charged Ar ions is described. To investigate this effect clearly, we directly plated the surface with 20 μm Al2O3 of the Al cylinder (Al2O3 plating method). This cylinder was inserted into the plasma chamber and it covered its inner wall of. We then measured the beam intensity of highly charged Ar ions carefully. By comparing the beam intensity using the Al2O3 plating method and the Al cylinder, it is confirmed that the Al2O3 surface is very effective in increasing the beam intensity of highly charged heavy ions. The best result of 290 eμA of Ar11+ was obtained by using this method. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1427029
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  • 5
    Digitale Medien
    Digitale Medien
    Fast neutron radiography and trace element analysis: New application of electron cyclotron resonance ion sources (abstract) : Papers from the Ninth International Conference on Ion Sources (2002)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 73 (2002), S. 937-937 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: We have started a new project, in which we have utilized an electron cyclotron resonance ion source (ECRIS) and a heavy ion linac for trace element analysis. This combination is expected to identify many kinds of trace elements simultaneously with very low background [very low detection limits (sub-pg/g) were attained by this method] without the pretreatment of a sample. This system is also applicable to fast neutron radiography, because it is possible to produce intense fast neutron beams. When we produce 100 μA of a Li beam from the ECRIS and use the nuclear reaction of H(Li,n)B at ∼2 MeV/u for production of neutrons, we can easily produce an intense focused fast neutron beam (∼2 MeV, 1010 particles/s). It has great advantages for neutron radiography. (1) We can minimize the background of the neutrons and gamma rays produced by the neutron-induced reaction, because the neutrons are emitted just at a forward angle. (2) Intense fast neutron beams can be easily produced. This kind of beam is very useful for fast neutron radiography. In this article, we present the experimental results of trace element analysis of several ceramic rods. We also present the basic idea of fast neutron radiography using this system and the planned experiment in detail. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1432467
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  • 6
    Digitale Medien
    Digitale Medien
    Recent performance of Japanese electron cyclotron resonance ion sources (invited) : The 8th international conference on ion sources (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 637-642 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Since the first Japanese electron cyclotron resonance ion sources (ECRISs) constructed, several tens of ECRISs have been used in many Japanese laboratories. Even if we choose the ECRIS which has an operational frequency higher than 6 GHz, 20 ECRISs are used for various purposes. At the end of the 1990s, three 18 GHz ECRISs were successfully operated and produced an intense beam of highly charged ions at JAERI Takasaki, NIRS and RIKEN; i.e., 1 mA of Ar8+ and 300 eμA of Ar11+. Various improvements to increase the beam intensity have been done, concerning the aluminum cylinder, biased electrode method. In the last decade, over 50 kinds of metallic ions have been produced from ECRIS using various methods. In 1998, we started to construct new superconducting ECRIS and to perform new experiments of mass spectrometry using ECRIS. This article will review the ECRIS progress and discuss the mechanism to increase the beam intensity of highly charged ions. We also describe a future plan and its new application in Japan. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1150335
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  • 7
    Digitale Medien
    Digitale Medien
    Construction of a variable-frequency radio-frequency quadrupole linac for the RIKEN heavy-ion linac (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 4523-4531 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A new type of variable-frequency radio-frequency quadrupole (RFQ) linac has been constructed as a new preinjector for the RIKEN heavy-ion linac (RILAC). The RFQ resonator, based on a folded-coaxial structure with a movable shorting plate, is compact even in a low frequency region below 20 MHz. It accelerates ions with mass-to-charge ratios of 5.3 to 26.4 in the energy range up to 450 keV per charge, by varying its resonant frequency from 17.4 to 39.0 MHz. Moreover, the power loss is small in the low frequency region; the rf power consumption in cw mode is 7 kW at 17.4 MHz, and it increases to 30 kW at 39.0 MHz at the maximum intervane voltage of 36.8 kV. We initiated this project in 1991, and installed the new preinjector consisting of an electron cyclotron resonance ion source of 18 GHz and this RFQ in 1996. Since the installation, the beam intensity has become larger by more than 1 order of magnitude than that formerly obtained with the Cockcroft–Walton preinjector. Recently, the maximum power of the beam extracted from the RILAC and that from the ring cyclotron has reached 560 W and 2 kW, respectively. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1150105
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  • 8
    Digitale Medien
    Digitale Medien
    Longitudinal optical phonon relaxation in a GaAs/AlGaAs triple barrier tunnel diode at strong perpendicular magnetic fields (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 1596-1598 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Longitudinal optical (LO) phonon relaxation is investigated in a GaAs/AlGaAs triple barrier tunnel diode at strong perpendicular magnetic fields. We observe LO-phonon assisted tunneling to the ground state as well as to Landau level states. Maxima in the LO-phonon assisted tunnel peak are found each time the LO-phonon energy matches multiple of the Landau level spacing. Corresponding maxima as well as parity effects are found in the integral tunnel conductance. The results indicate enhancement of LO-phonon assisted inter Landau level transitions with increasing magnetic field. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.117042
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  • 9
    Digitale Medien
    Digitale Medien
    Enhancement of the quantum efficiency and stability of electroluminescence from porous silicon by anodic passivation (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 2021-2023 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The use of anodic oxidation as a post-treatment of porous silicon has been investigated to enhance the external quantum efficiency of electroluminescence from a device based on a thin transparent indium tin oxide contact on porosified n+-type silicon. Enhancement in external quantum efficiency of three orders of magnitude has been obtained. We report here an external quantum efficiency of 0.21%. The treatment also greatly improves the stability of the device. Results can be explained by the fact that anodic oxidation considerably reduces leakage current flowing via nonconfined silicon. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.122355
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  • 10
    Digitale Medien
    Digitale Medien
    Spaciostructural analyses of mandibular and perioral soft tissue movements during mastication (2001)
    Oxford UK : Blackwell Science Ltd
    Journal of oral rehabilitation 28 (2001), S. 0 
    Details
    ISSN: 1365-2842
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: We considered that elucidation of the movements of perioral soft tissues during mastication would be useful in evaluating masticatory movements. However, evaluation of movements specific to soft tissues is difficult because movements of the surface of the lower face during mastication include movements of the muscles of facial expression and mandibular movements. The aims of this study were to elucidate the influence of mandibular movements on perioral soft tissue movements during mastication using principal component analysis (PCA) and to abstract the component of movement specific to soft tissues in order to evaluate masticatory movements from the movements of perioral soft tissues. The subjects were 10 healthy persons with complete natural dentition. The experimental food used in this study was sufficiently softened chewing gum. The results of this study showed that the movements of mandibular and perioral soft tissue were closely related in the first and third PCs; in other words, the second PC was the component of movement specific to soft tissues. Thus, elucidation of the second PC is useful for evaluation of masticatory movements from movements of perioral soft tissues.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2842.2001.00751.x
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