Ionization vacuum measuring cell

Ionization vacuum measuring cell (10), comprising:

• a) an evacuable housing (12) having a measuring connection for a vacuum to be measured at an end portion;
• b) a measuring chamber (14) in the housing (12), which is in fluid communication with the measuring connection, wherein the measuring chamber (14) is preferably designed as an exchangeable component;
• c) a first and a second electrode (16, 18) in the measuring chamber (14), which are arranged substantially coaxially with respect to an axis and spaced from each other, whereby an ionization space is formed in the measuring chamber (14) between these two electrodes (16, 18), wherein the first electrode (16) acts as a cathode and preferably has a substantially cylindrical surface and the second electrode (18) acts as an anode and is preferably rod-shaped and lies on the axis;
• d) an electrically insulating and vacuum-tight feedthrough (20) for electrical supply to the second electrode (18), comprising an electrical insulator, wherein the second electrode (18) is passed through said insulator in a sealing manner;
• and
• e) a magnetization arrangement which is designed to generate a magnetic field in the ionization space, characterized in that the measuring chamber (14) comprises magnetic material and that the first electrode (16) and/or the second electrode (18) either consists/consist of magnetic material or is/are coated with the magnetic material, wherein the magnetic material of the measuring chamber, of the first electrode, and of the second electrode each substantially extends parallel to said axis, wherein the magnetization arrangement is arranged radially outside the measuring chamber (14) and is designed to generate a magnetic field whose magnetic field lines within the ionization space extend substantially parallel to the axis thereof.