SU342562A1 - - Google Patents

Description

INJECTION DEVICE WITH PHASE SHUTTER

This invention relates to accelerator technology.

Injecting devices with phase closures for particle bunches are known that operate on the principle of phase deflection voltage variation with respect to the moment a bunch closes in a deflection field. The known closures allow all bunches entering the pulse sequence to pass in a given direction with one phase setpoint or to divert all bunches from the original direction with other phase set points.

However, using such phase closures, it is not possible to smoothly change in the wide range the number of clots that are transmitted in a given direction.

The proposed device provides a smooth adjustment of the number of bunches transmitted in a given direction by adjusting the frequency of the clots following a fixed excitation frequency of the diverting device and a fixed excitation frequency of the grouping device.

The essence of the invention is the cumulative use of a klystron type grouper and a pulsed generator of a particle source with an adjustable shape of the pulse width.

FIG. 1 shows a block diagram of the proposed device, comprising a pulse generator 1, an electron source 2, a resonator 3, a high frequency generator 4, a phase shifter 5, a chopper 6, and a diaphragm 7.

FIG. 2 shows the graphs: a - pulse voltage at the output of the generator 1.6 - change in voltage over time in the grouping gap of the resonator 3 and phase

particles with identical velocities at the exit from the resonator, c is the change in time of the transverse electromagnetic field in the chopper (I - electron bunches transmitted by the diaphragm, 3 - delayed bunches).

The pulse generator 1 is connected to an electron source 2, behind which a resonator 3, a chopper 6 and a diaphragm 7 are located on the beam path. The resonator 3 is connected to a high-frequency generator 4, which also connects the chopper 6 through a phase shifter 5.

The pulse generator / is, for example, a linear modulator with adjustable inductance cells of the forming line. The resonator 3 is a klystron breeder with a longitudinal electric field. Chopper 6 is made in the form of a resonator with a transverse electric field.

Pulse / and high frequency 4 generators are turned on but the signal of the synchronization system. The impulse generator / giperir em high-voltage impulse with increasing amnlituda (see Fig. 2, a) and excites the source of electrons 2, which generates a nouchea with increasing energy. At the same time, the generator 4 excites the resonator 3 n through the phase shifter 5 of the chonner 6. The electron beam passes through the resonator 3 and is subjected, in longitudinal direction, to an alternating electromagnetic field (see Fig. 2.6).

After exiting the resonator 5, the electrons in the beam turn out to be nromodulated at speeds. The particles that have passed through the resonator 3 in the phases shown in FIG. 2, 6 dots, have the same speed, equal to the velocity of the central particle of the beam, which passed the resonator 3 prn zero amplitude zero. The equality of velocities is explained by the fact that the earlier of these particles received less energy at source 2 than the energy obtained at the later ones, and the early particles received more energy at resonator 3.

Moving from the resonator 3 to the chopner 6, the electrons are grouped around the particles with the same speeds, and the period of the bunches is different from the period of the grouping field and depends on the inclination of the peak of the generator pulse /. In particular, at the iloisk peak, the periods coincide, and all bunches can be equally rejected depending on the setting of the phase shifter 5.

chopper 6 and missed aperture 7, or, conversely, delayed.

If the generator's impulse / increases with time, electron bunches (I and 5 in Fig. 2, c) are transferred to a chopper 6 with a period less than the oscillation period in the chopper, and turn out to be differently phased relative to the deflecting field. As a result, one of them (P in Fig. 2, in

maximally and pass through the hole in the diaphragm 7, while others (3 in Fig. 2, c) are retained.

By adjusting the shape and inclination of the peak of the generator pulse /, it is possible to change the number of bunches transmitted by the diaphragm 7.

The grouping coefficient in different bunches is different; the largest coefficient is observed for bunches grouped around particles that pass through the resonator during

zero amplitude It is these bunches that are missed by the diaphragm 7.

Subject invention

A phase gate device comprising a pulse generator, an electron source, a resonator grouper, a chopper, a diaphragm, a high frequency generator, and a phase shifter, characterized in that .

L a / l

1-V- / L T / Z