D B van Hulsteyn

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We prove that, at the frequencies generally proposed for extracranial stimulation of the brain, it is not possible, using any superposition of external current sources, to produce a three-dimensional local maximum of the electric field strength inside the brain. The maximum always occurs on a boundary where the conductivity jumps in value. Nevertheless, it(More)
A major fraction of the x-ray flux from laser-produced plasmas is in the subkilovolt regime. The spectral content in this region is measured with x-ray diodes, which contain no spatial information. We present a description of a pinhole camera that operates in the 200-300-eV range. This permits the correlation of an image with corresponding x-ray diode data.(More)
We have developed a device which employs parallel dc electric and magnetic fields in combination with an array of collectors and accompanying electronic circuits to measure simultaneously the momentum distributions of different ion species from a laser produced plasma. This diagnostic system automatically separates the ion species according to mass to(More)
A slitted crystal spectrograph has been used to produce two-dimensional, spatially resolved, monochromatic images of laser-irradiated targets. The technique is described, and examples are presented for comparison with corresponding pinhole photographs. Resolution along and transverse to the dispersion are determined by the crystal rocking angle and geometry(More)
To investigate the uniformity of compression of spherical targets irradiated with high-energy CO(2) lasers, an array of pinhole cameras has been set up to obtain 2-D views from four different directions. To reconstruct the 3-D source we have devised a computer code based on a maximum entropy algorithm. With synthetic input data the code gives acceptable(More)
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