SU1625257A1 - Pulse source of ions - Google Patents

Abstract

The invention relates to ion sources used in thermo-nuclear installations, accelerators of charged particles and technological installations. The purpose of the invention is to increase the extraction efficiency and increase the phase density of the flow. VjoiioBo cathode and anode made in the form of an end wall with an emission hole The cathode and chamber walls are independently connected to pulsed high-voltage power supplies issionnoe anode hole is sealed by a movable shutter of the solenoid valve in the discharge chamber with a gas line, connected to a processing gas supply system of a coaxial discharge chamber with its outer side arranged permanent magnets creating a magnetic field inside the chamber acute configuration. The intensity of the magnetic field increases from the longitudinal axis of symmetry of the pas - closest chamber to its machines 3 Il.

Description

The invention relates to ion sources used in thermo-nuclear installations, accelerators of charged particles and in technological installations.

The aim of the invention is to increase the extraction efficiency and increase the phase density of the ion flow.

Fig I shows a diagram of ion sources; Figure 5 shows a cross section of the discharge chamber of the ion source in the region of the end wall with the configuration of the magnetic field lines of force; on. Fig. 03 shows the distribution of the magnitude of the induction B of the magnetic field over the diameter d of the discharge chamber in the region of the emission hole.

The pulsed ion source contains a discharge chamber 1 connected to the positive pole of the pulsed power supply source 2, the anode 3, made in the form of an electronically polished end wall of the chamber,

o yu

JV Yu

ate

h

The ion source with housing A is “In the anode 3, an emission hole 5 is made.” The solenoid valve 6 is installed so that its movable valve tightly closes the emission hole 5 °. The permanent magnets 7 are arranged in such a way (see Fig. 10) that the magnetic field created by them forms a sharp JQ is the coal configuration of the power lines, the height from the center of the discharge chamber to its periphery, while on the longitudinal axis of the chamber in the region of the emission hole the magnitude of the magnetic field is minimal (see „FIG. 03) о В the remaining ion source enters the gas main 8 supplying the working gas to the chamber 1, a hollow non-calcined cathode 9 of cylindrical shape, located 20 along the longitudinal axis of the discharge chamber. P "25

Electrical power sources 2, 10 are pulsed high-voltage circuits known in the art of designs,

The proposed ion source works as follows

In the initial state, the bulkless cathode 9, the walls of the discharge chamber I and the anode 3 are at the same electric potential, and the discharge chamber I is filled with working gas through the gas line 8. Gas flows from the discharge chamber 1 into the external volume. of the electromagnetic valve 6, which blocks the Q emission anode opening in the gaps between the source working pulses, the magnets 7, create a constant acute-angular magnetic field in the discharge chamber 1, the magnitude of which rapidly increases in the region of the walls to amers. During this period of time, the source of electrical energy does not consume. For igniting the electric discharge in the chamber of the source one. temporarily, for the period of burning of the discharge, voltage is applied to the corresponding electrodes: to the cathode — a high-voltage negative voltage coming from the power source 10; The side walls of the discharge chamber 1 are energized by a high-voltage positive-polarity impulse from the power supply 2, when

thirty

35

55

Q 5 0 5

Q $ 5. 0

five

55

In this way, the valve of the solenoid valve 6 opens the emission port 5 for the time required for the discharge of iodine ions by the action of the potential difference arising between the cathode 9 electrically isolated from the source case and from each other and the side walls of the discharge chamber I, the process of field emission occurs from the sharp edges of the cathode 9 "This process initiates the development of a gas discharge. Primary electrons from the cathode and the slow electrons formed by them as a result of the ionization of the working gas The electrical potentials applied between the cathode 9 and the walls of the discharge chamber 1 are accelerated, gaining enough energy to ionize the gas in a shorter time and on a shorter path length than is the case in the prototype, They ionize the working gas and entering the near-wall region with a strong magnetic field created by the magnets 7, are returned back to the ionization zone. As the chamber wall approaches, the magnetic field begins to increase dramatically, resulting in an increase in the lifetime of the electric field. Taking into account the increased level of gas pressure during the discharge period in the chamber, achieved by introducing electromagnetic valve 6 into the design, and the fact that electrons acquire the potential sufficient to ionize gas during a short run, which is characteristic of higher gas pressures, and the departure of positive ions as a result of radial drift from the ionization region to the side walls of the discharge chamber is made difficult by the presence of a high positive potential created by the power source 2, becomes possible m start electric arc discharge between non-cathode cathode 9 and anode 3 in a region free of a magnetic field, characterized by a high current density. This allows an increase in the density of the ion component in the plasma and leads to an increase in the ion beam current source outlet

Since the proposed source uses a non-cathode cathode that does not require pre-heating, there is no source of electricity from an external circuit between operating pulses, which makes it energy-efficient More from prolonged heating, increases the reliability of the proposed design, the presence of an electromagnetic valve, the movable valve which closes the hole Emissions in the anode in the period between operating pulses, preventing gas from flowing from the discharge chamber into the external volume, opening up only for the time of ion release of the beam, allows for a rational consumption of the working gas and reduces the gas flow of the devices external volume

As a result of testing an experimental sample of a pulsed ion source with a peripheral magnetic field at an accelerator with a direct current pulse duration of 4-1 (and pulse repetition frequency I Hz, using hydrogen as the working gas in the discharge chamber, a beam of positive ion with a current of 6 A, having a phase density of 6 ADhm Mrad), accelerated to 30 kV, and consumed by the source

/ f

eight

V

I

BUT.

W

electric 0W.

surpass HP power

five

Claims (1)

The invention has a pulsed ion source, comprising a housing, a discharge chamber, along the longitudinal axis of which is a hollow cold cathode and an anode, made in the form of an end wall of the chamber with an emission hole, a controlled electromagnetic valve with a movable damper, hermetically closing the emission hole, an exhaust electrode , a magnetic system, a system for supplying a working gas to a discharge chamber, pulsed high-voltage power supplies connected to the cathode and walls of the chamber, characterized in that To increase the extraction efficiency and increase the phase density of the ion flux, the end wall with the emission hole is electrically insulated from the differential chamber and connected to the source body, and the magnetic system is designed in such a way that a magnetic field is formed inside the discharge chamber, The magnetic field increases in intensity from the longitudinal axis of symmetry of the chamber to its walls, and the walls of the discharge chamber are connected to the positive pole of the power supply, 0 0 five  J V 1 2 d -Er Fig.Z