The NRL Long-Wavelength Test Array (NLTA) was constructed to develop and test active baluns and electrically short dipoles for possible use as the primary wideband receiving elements for an emerging suite of large HF/VHF arrays including the Low Frequency Array (LOFAR) and the Long-Wavelength Array (LWA). Several dipoles of various designs and dimensions have been built and tested. Their useful range is when the dipoles arms are between approximately 1/8 ...
THE EFFECT OF RF SPUTTER ETCHING ON THE SURFACE OF SILICON WAS STUDIED BY OBSERVING BACKSCATTER SPECTRA FROM A 2 MEV, 4HE+ BEAM ORIENTED ALONG THE SILICON CHANNEL. SILICON SAMPLES WERE RF SPUTTER ETCHED IN A 5 X 10 TO THE -3 POWER TORR, ARGON DISCHARGE AT ELECTRODE BIAS POTENTIALS RANGING FROM 0.5 TO 2.5 KV. THE SAMPLES WERE SPUTTER ETCHED FOR A TIME SUFFICIENT FOR THE LATTICE DAMAGE TO ...
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