Angular dependence of x-ray spectra from a demountable x-ray tube with a copper target

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The x-ray generator consists of the following components : a constant high-voltage power supply, a filament power supply, a turbomolecular pump, and an x-ray tube. The x-ray tube is a demountable diode which is connected to the turbomolecular pump and consists of the following major devices : a tungsten hairpin cathode (filament), a focusing electrode, a polyethylene terephthalate x-ray window 0.25mm in thickness, a stainless-steel tube body, and a rod target. In the x-ray tube, the positive high voltage is applied to the anode (target) electrode, and the cathode is connected to the tube body (ground potential). In this experiment, the tube voltage applied was from 12 to 18kV, and the tube current was regulated to within 0.10mA by the filament temperature. The electron beams from the cathode are converged to the target by the focusing electrode, and x-rays are produced from the target plane. The x-ray spectra were measured from two directions with angles between the electron trajectory and the x-ray beam axis of 180° and 90°. As compared with the x-ray spectra with an angle of 90°, the bremsstrahlung x-ray intensity decreased slightly with an angle of 180° (opposite direction to that of electron trajectory).

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