[en] A magnetically insulated diode using an active anode plasma ion source was developed and thoroughly characterized. In this extraction geometry ion diode, an anode plasma of annular shape and 30 cm diameter is formed independently of the injector voltage pulse. The anode plasma is produced by inductive voltage breakdown of a radially expanding gas cloud supplied by a fast puff valve. This diode was driven by the low voltage (<200 kV), long pulse (>1 μs) LONGSHOT II generator. It was capable of producing prompt ion current turn-on, long pulse (1 μs), high current density (>100 A/cm₂) proton beam output at 70-150 keV when using hydrogen gas. Other characteristics of this diode include: extraction of a pure proton beam within the 20% measurement uncertainty; diode voltage pulse shape (flat, decreasing or increasing in time) and pulse length control by injection of the anode plasmas with differing density and/or timing; capable of flat or increasing impedances; an effective gap closure velocity of <2 mm/μs during the main power pulse; low neutral to plasma density ratio at the gap; up to 5 J/cm² energy density deposited over a beam extraction area of 300 cm²; more than 1 x 10¹⁷ particles per pulse with >60 keV; global beam uniformity better than +/-35% (10% on a 1 cm length scale); ion current efficiency of at least 40%; and typical divergence of <3⁰ half angle

[en] This is a research report report on the work developed at the National Institute for Fusion Science - Japan, involving study of Beam Emission Spectroscopy. It describes the use of a fast neutral lithium beam (8 KeV) to measure the density profile in a Compact Helical Device. (A.C.A.S.)

[en] The Multiple Application Intense Particle Beam project is an experiment in which an injector of high energy neutral or ionized particles will be used to diagnose high density and high temperature plasmas. The acceleration of the particles will be carried out feeding a diode with a high voltage pulse produced by a Marx generator. Other apllications of intense particle beam generated by this injector that could be explored in the future include: heating and stabilization of compact toroids, treatment of metallic surfaces and ion implantation. (author)

[en] The construction of an electrostatic accelerator to produce an intense ion beam is proposed. The high voltage pulse to be used in the acceleration of the ions (500 kV, 1 μs) will be provided by a Marx generator. Using this pulses, a high total current proton beam (>200 KA) will be extracted from a magnetically insulated diode with an anode plasma produced by an inductive breakdown of hydrogen gas. The beam will be injected into a magnetic confinement device, a tokamak to be called ETA (Experimento Toroidal Avancado), to study heating, refueling and noninductive current generation in toroidal plasmas. (author)

[en] In this report, the construction and calibration of a gas pressure meter with a time resolution better than 20 μs are described. The meter consists basically of a sensor of the FIG (Fast Ionization Gauge) type and an adequate electronic circuit. A 6AU6A pentode vacuum tube without the glass envelope is used as the sensor head. (author)

[en] The fusion reaction of a halo nucleus ¹¹Be on ²⁰⁸Pb is described by a three-body direct reaction model. A time-dependent wave packet approach is applied to a three-body reaction problem. The wave packet approach enables us to obtain scattering solutions without considering the three-body scattering boundary conditions. The time evolution of the wave packet also helps us to obtain intuitive understanding of the reaction dynamics. The calculations indicate a decrease of the fusion probability by the presence of the halo neutron

[en] A small RFP (Reversed Field Pinch) apparatus for turbulent plasma studies, which is called CECI (Configuracao de Estriccao a Campo Inverso) is described. The apparatus has a major radius of 12 cm and a minor radius of 4.2 cm. (author)

[en] A small reversed field pinch (RFP) apparatus has been constructed in INPE to study the energy relaxation process in magnetized plasmas. This report describes the preliminary results of the plasma experiment started in 1988. (author)

[en] Boron carbide has been utilized as a neutron absorber in boiling water reactors (BWRs) and other types of reactors. It has a number of advantages, yet is not well suited for very high neutron exposure. An alternative long-lived control blade has therefore been sought. It is well known that hafnium may be best suited for this purpose, yet it has the disadvantage of heavy weight and low reactivity worth. This has been overcome by introducing a flux-trap-type all-hafnium control blade for BWRs. The blades are now involved in licensing procedures in some Japanese BWR plants

[en] In this paper we discuss the application of a visible spectrometer which was used to diagnose a plasma produced in an RFP device, called CECI. A Jobin Yvon, HR-640 S spectrometer with a photomultiplier detector was used to measure the Doppler broadening of lines emitted by the plasma, and allowed to measure the ion temperatures of the order of 2-3 eV. The electron temperature of 40-50 eV was determined by the method of He I line intensity ratio. The spectroscopically determined ion temperature is in better accordance with the 10 eV electron temperature obtained with an electrostatic probe. The line emissions of He II, H I, C II and O II were compared with signals from other diagnostics, and their correlations indicated the presence of MHD instabilities in the plasma. (author)