| 摘要 |
1,172,178. Discharge apparatus. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 19 Aug., 1968 [22 Aug., 1967], No. 39644/68. Heading H1D. A plasma generator employed in a vacuum tube for physical investigations comprises a central rod electrode 1, an insulating sheath 2 and an outer block-shaped electrode 5 of sintered metal adsorbed with the gas from which the plasma is to be formed. The insulating sheath extends as shown to the upper ends of the electrodes 1, 5 between which an arc may be struck on discharge of the capacitor 13. The upper end of the insulating sheath is ground to form a convex surface. By abrading the upper flat face of the device the thickness of insulation between the ends of the electrodes 1, 5 may be adjusted to be about 1 mm. A heater 6 is incorporated in the block 5 and serves to de-gas the block prior to impregnation with the desired gas, e.g. deuterium, and in operation serves to release the deuterium. The electrode 1 consists of titanium, molybdenum or thoriated tungsten and is welded to the circular plate 2 which forms the end of a pin 3 of stainless steel or an Fe-Ni-Co alloy, the insulating sheath 2 consists of alumina or other ceramic material and the block 5 consists of sintered titanium particles, 40 to 100 Á in diameter. When the device is introduced into the vacuum tube, previously adsorbed argon is removed by heating the block 5 and the deuterium taken up. Suitable dimensions are given. |
