SU1422409A1 - Method and apparatus for withdrawal of electron-ion rings from adhesion device of collective accelerator - Google Patents

Abstract

1, A method of emitting electron-ion rings from an adhesive of a collective accelerator, including sweeping along the acceleration axis of a magnetic potential we holding an electron-ion ring, with a simultaneous reduction to zero of the potential barrier of the main driving magnetic field, characterized by that, in order to reduce the loss of accelerated ions by reducing the radial total drift. rings at the output, simultaneously with the beginning of the displacement of the magnetic potential, we excite an additional magnetic field with a non-zero first azimuthal harmonic whose amplitude is equal and the sign is opposite to the amplitude and sign of the first harmonic of the azimuthal heterogeneity of the main driving magnetic field. V 2. A device for withdrawing electron-ion rings from a collective accelerator adhesive, containing an accelerator chamber, a pair of current coils to create a magnetic potential, and an accelerating solenoid, characterized in that, in order to reduce the loss of accelerated ions by reducing the radial drift of the ring at In the output, in the output area of the ring, an accelerating solenoid has installed pairs of current turns of the same radius, eccentrically located relative to the axis of the device, having equal "values and mutually opposite the directions of eccentricities of the centers relative to the accelerator axis, provided with means for changing their position. . . . SS (Л с | «1 СЧЭ SD О ф

Description

The invention relates to an accelerator technique, in particular to a collective method of ion acceleration by electrons with rings, and can be used for a wide range of outputting electron-ion rings with compensation for radial drift of a ring.

The aim of the invention is to reduce the loss of accelerated ions by reducing the radial drift of the ring during extraction.

When the ring is removed, the magnetic potential of the electron ring that holds the electron ring is shifted along the accelerator axis while simultaneously decreasing the potential barrier of the main driving magnetic field to zero, simultaneously with the beginning of the ring shift, an additional field with a significantly different zero azimuth harmonic is excited.

In the device for carrying out the method, the goal is achieved in that in the known device comprising an accelerator chamber, creating a magnetic potential pair of current coils and an accelerating solenoid, in the area of the outer ring before the accelerating solenoid there are pairs of current turns of the same radius eccentrically located about the system axis , having equal values and mutually opposite directions of eccentricities of the centers relative to the accelerator axis.

The magnitude and azimuthal orientation of the first azimuthal harmonic field of additional coils (additional field) is chosen so that they compensate for the first harmonic of azimuthal inhomogeneity of the main driving magnetic field in the vicinity of the homing point and thereby eliminate the cause of the radial drift. In the absence of a significant magnitude of the zero harmonics of the dividing field on the ring radius, there are no changes in the axial distribution of the main driving magnetic field, therefore, the mode of the ring output does not change, i.e. the position of the point and the moment of the removal of the potential we do not change.

The method is as follows.

The formation of electron-ion rings in the collective accelerator adhesive is completed by compression in

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the increasing magnetic field of a pair of coils, according to and sequentially connected to the generator. To output a ring, one of the compression coils is shunted where the current begins to fall, while the current in the non-shunted coil is increasing. In this case, the potential entrained ring is shifted in the direction of the shuntable coil. The potential barrier from the shuntable coil is reduced, vanishing at the output point. Simultaneously with the moment of shunting, an accelerating gradient magnetic field increases in time, reaching a maximum value simultaneously with the potential barrier of the magnetic we vanishing. At the same time, with the onset of the displacement of the electron-ion ring in the additional turns, a rising current is switched on. The law of change of the current and the moment of its switching on is chosen so that the current in the coils reaches a maximum value of 1 at the moment of its turning to zero potential barrier.

i

The direction of the current in the coils and the geometry of the coils are chosen so that the field of this current on the radius of the ring has only the first azimuthal harmonic different from zero. Changing the value and azimuthal orientation of the first azimuthal harmonic of the additional magnetic field compensates for the first harmonic of the azimuthal inhomogeneity of the main driving magnetic field at the radius of the ring at the point of output.

In the process of the output, deviations of the center of the ring from the accelerator axis can occur due to the different nature of the dependences of the first harmonics of the main and additional fields. However, by selecting the current amplitude in the turns, the value of the resulting ring drift decreases to insignificant. The radial drift that occurs when the output mode changes (for example, if it is necessary to produce rings of a smaller radius, the field in the compression coils and the gradient field increase, which leads to a violation of the first harmonic compensation of the primary field by the first harmonic of the additional field), also compensated by changing the current amplitude in additional turns.

FIG. 1 is a schematic diagram of the device; in fig. 2 and 3 - two variants of the additional turn design, which create an additional field according to the proposed method / (the means for changing the position of the turns and their power sources are not shown).

The device contains a vacuum chamber 1, current coils 2 and 3, an electron-ion ring A, a solenoid 5 and additional coils 6,

To excite an extra floor in the space between the two

relative to the magnetic axis of the system with equal and symmetrically oppositely directed eccentricities.

The device works as follows.

In order to implement the electron-ion ring 4 from chamber 1, at the end of the compression cycle, coil 3 is shunted where the current begins to fall, while the current in the coil 2 is charged. Approximately simultaneously with the moment of shunting include an increasing

the vacuum chamber chamber 1 and the coil-15 accelerating gradient in time

This 3 has additional coils 6 connected to a separate generator (not shown).

Additional coils depending on the specific features of the known 2o saci of the first azimuthal harmonic of the device can be made in, the main floor is achieved by choosing

a magnetic field. Simultaneously with the beginning of the displacement of the electron – ion ring, the additional current increases in time in the additional turns. A compensated of two options: with a zero harmonic field equal to zero (Fig. 2) and with a non-zero but insignificant zero harmonic (Fig. 3) compared to the leading magnetic field, the radius of the turns is chosen from the condition R coil 3.

The pairs of turns perform the same con

figurations and have an eccentric

7

Satsi the first azimuthal harmonic of the main floor is achieved by choosing

a magnetic field. Simultaneously with the beginning of the displacement of the electron-ion ring in the additional turns, the current increases in time. Compensation current in the coils and the azimuthal orientation of the eccentricity of a pair of coils. The magnitude of the current in the coils changes as the voltage on the power supply generator changes. The change in the azimuthal orientation of the eccentricity of the additional coils is made by rotating, by a pair of coils wound on a common frame, around the longitudinal axis of the magnetic system. I

Fg / d /

Order 4441/57

Circulation 832

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

fPuz.2

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Claims (2)

1. A method for withdrawing electron-ion rings from an adhesive collector of an accelerator collectively ό, comprising mixing along the acceleration axis of a magnetic potential well holding an electron-ion ring, while simultaneously reducing to zero the potential barrier of the main driving magnetic field. For the direction of acceleration, characterized in that, in order to reduce the loss of accelerated ions by reducing the radial drift of the ring during output, simultaneously with the beginning of the shift of the magnetic potential well, an additional magnetic field is excited with a non-zero first azimuthal harmonic whose amplitude is equal and the sign is opposite the amplitude and sign of the first harmonic of the azimuthal heterogeneity of the main leading magnetic field. v 2. A device for withdrawing electron-ion rings from the collective accelerator adhesive, comprising an accelerator chamber, a pair of current coils for creating a magnetic potential well and an accelerating solenoid, characterized in that, in order to reduce the losses of accelerated ions by reducing the radiative drift of the ring during output , in the output region of the annular ring by an accelerating solenoid, pairs of current turns of the same radius are established, eccentrically located relative to the axis of the device, having equal "values and mutually opposite direction of eccentricity of the center with respect to the accelerator axis, provided with means to change their situation.