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DESIGN AND RESEARCH OF ORBITRON IONIZATION MANOMETRIC CONVERTER

V. K. Bazylev, PhD (technical sciences), associate professor, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
A. M. Zhidkov, post-graduate student, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
V. A. Korotchenko, PhD (technical sciences), professor RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
V. E. Skvortsov, General manager, MELP, Zaprudnya; This email address is being protected from spambots. You need JavaScript enabled to view it.
T. N. Andreasyan, student, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.

An electrode system was developed, an electric mode was determined, and experimental sample of ionization manometric converter of orbitron type with low (up to 300 V) anode voltage and high vacuum sensitivity was performed. Using numerical simulation, it was shown that at cathode potentials (10 – 50) V the characteristic values of retention time of electrons in orbitron trap are (0,1 – 1) μs, but there are cases of retention for a long (up to 33 μs) time. Data about mechanism of electron trap formation and characteristic of electrons motion are presented. It is shown that the steady-state mode of motion occurs approximately after 5 μs. In the interval (5 – 33) μs, the radius of shuttle spiral is stabilized on the level 6 ± 0,3 mm, and the energy is 95 ± 7 eV. Single pass time of the electron around anode is 6,5 ns, the axial oscillations period is 120 ns, lead of spiral is 4,6 mm, number of rotations is about 5000, path length is about 200 m. The ability of the orbitron developed to record gas pressure in the range (5 – 35) μTorr at an average value of orbitron gauges sensitivity equal to 2200 Torr–1 , which is approximately two orders of magnitude greater than for the widely distributed PMI-2 ionization manometer has been experimentally proved. The aim of the work is to improve ionization vacuum sensors by increasing their manometric sensitivity, reducing the level of gassing in sensors and reducing ionic pumping of gases during the operation of gauges.

Key words: vacuum gauge, ionization manometer converter, orbitron vacuum sensor, сomputer modelling, motion of electrons.

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