Adjustable vacuum condenser

An adjustable vacuum condenser, especially for high capacities, comprising:

• (a) a cylindrical housing of an insulating jacket, an upper metal jacket connected to the insulating jacket at its top end, a lower metal jacket connected to the insulating jacket at its bottom end, a cover closing the upper metal jacket, and a base part closing the lower metal jacket;
• (b) in the housing;
• two inter-engaging electrode systems comprising a lower electrode system and an upper electrode system, the lower electrode system of which is fixed to the base part, and the upper electrode system is arranged displaceably in a direction of the housing axis by means of an actuating rod running through an opening in the cover;
• (c) at least one set of bellows which concentrically surrounds the actuating rod, connects the cover with the upper electrode system and serves as current feed for the upper electrode system;
• (d) an electrically conducting jacket, which concentrically surrounds the set of bellows and conducts on its inner face the high-frequency operating currents to the set of bellows via the cover;
• wherein:
• (e) an outside of diameter of the set of bellows and an inside diameter of the electrically conducting jacket are adapted to one another in order to reduce the self-inductivity of the vacuum condenser;
• (f) the ratio of the inside diameter of the electrically conducting jacket and the outside diameter of the set of bellows is smaller than or equal to 1.5;
• (g) the upper metal jacket has a diameter, which is essentially the same as a diameter of the insulating jacket;
• (h) inside the upper metal jacket there is arranged an inner metal jacket which concentrically surrounds the set of bellows;
• (i) the inner metal jacket forms the electrically conducting jacket;
• and
• (j) the inside diameter of the electrically conducting metal jacket is adapted to the set of bellows.