Electricity: measuring and testing – Using ionization effects – For monitoring pressure
Patent
1987-07-13
1988-12-20
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Using ionization effects
For monitoring pressure
313632, 324460, G01L 2132
Patent
active
047927631
ABSTRACT:
A hot cathode ionization gauge with which neutral gas densities in the ra 10.sup.17 to 10.sup.21 m.sup.-3 can be measured, in particular under the conditions typical of fusion-orientated plasma experiments (magnetic field strength from 0 to more than 3 tesla, magnetic field direction varying by up to +/-20 degrees or more and strong plasma-induced noise background), and which is of robust design, reliable in operation and very compact and has a high sensitivity which depends in a reproducible manner on the magnetic field strength and is independent, in a certain degree which is predetermined and can be influenced by the construction, of the field direction and, within a wide range, of the gas density comprises the following electrodes arranged in mutually spaced relationship in the stated order along an axis: a cathode consisting of a tungsten wire at least 0.5 mm thick and which has a middle, active portion, a plane control electrode of diaphragm form arranged at a close distance from and parallel to the active portion of the cathode and having an elongated opening with which the active portion of the cathode is in alignment, a plane accelerating electrode arranged at a distance from and parallel to the control electrode and having a series of parallel slit-shaped apertures extending perpendicularly to the longitudinal direction of the active cathode portion, and a plane, plate-shaped ion collector electrode parallel to the control electrode.
REFERENCES:
patent: 2334356 (1943-11-01), Salzberg et al.
patent: 2516704 (1950-07-01), Kohl
patent: 3274436 (1966-09-01), Reich
patent: 4095133 (1978-06-01), Hoeberechts
Eisenzopf Reinhard J.
Max-Planck-Gesellschaft zur Foerderung der Wissenschaften e.V.
Miele Anthony L.
Nields Henry C.
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