SU364986A1 - DEVICE FOR MEASUREMENT OF CURRENT AND ENERGY BEAM OF CHARGED PARTICLES - Google Patents

Description

one

This invention relates to accelerator technology.

A known device for measuring the current and energy of a beam of charged particles, which uses the dependence of the electron path in a metal on their energy, contains a current and energy sensor, which is a set of insulated aluminum plates associated with a measuring circuit. The measurement process takes a long time, and the entire beam current of accelerated particles is used for the measurement. Measurement results are processed manually.

The proposed device allows shortening the measurement time due to the fact that the normalization unit is designed as an amplifier, the negative feedback element of which is a quadratic characteristic diode connected to the beam current measurement unit.

The drawing shows a block diagram of the proposed device.

The device consists of a current sensor and the energy of a beam of accelerated particles, made in the form of two insulated metal plates I, 2 (foil and target), periodically introduced into the beam by means of a mechanical drive; a beam current measurement circuit including a three-channel pre-amplifier 3 connected in series with the sensor, a converter 4 of periodic pulse signals into continuous and a beam current measuring the current 5; Particle energy measurement circuits containing a pre-amplifier 3, a differential amplifier 6, generating a signal proportional to the difference of the currents from the plates / and 2, a pulse amplifier 7, which can

Negative feedback 8 associated with transducer 4 eliminates the effect of beam current imbalance on the magnitude of the current difference from the plates, and recording the energy of the particles of the measuring device 9.

The device works as follows. A sensor is mechanically driven periodically into the beam. At the intersection of the beam of accelerated particles with plates / and 2 through the resistors i and Rz pulsed currents / i and / o flow, and the difference in currents (/ 1- / 2) is proportional to the energy of the accelerated particles. The total current of the plates (/ i + A) proportional to the beam current flows through the resistor.

The voltage pulse signals, proportional to the current of the navel, are removed from the resistor, amplified by the preliminary amplifier 3, converted into continuous by the converter 4, and recorded by the device 5.

When measuring energy, voltage pulse signals proportional to currents Ii and I2 are removed from resistors Ri and R2, amplified by preamplifier 3, converted by differential amplifier 6 into signals proportional to the difference of currents from the plates} and 2. From differential amplifier 6, the signal is received to the pulse amplifier 7, the gain of which with the help of the negative feedback element 8 and the converter 4 is controlled in inverse proportion to the change in the beam current.

Thus, the sensor signals are normalized to the beam current. After amplifier 7, the normalized signals proportional to the energy of the particles are recorded by the device 9.

Subject invention

A device for measuring the current and energy of a beam of charged particles by using the dependence of the particle path in a foil on their energy, containing a target with a foil in front of it, normalization units and measuring the beam signal, characterized in that, in order to reduce the measurement time, the normalization unit is made in the form of an amplifier, the negative feedback element of which is a quadratic characteristic diode connected through a converter of periodic pulse signals to a continuous unit rhenium beam current.