SU468590A1 - Beam position transformer - Google Patents

Description

(54) BEAM POSITION CONVERTER

one

This invention relates to accelerator technology.

The known converters of the position of a beam of charged particles into a digital code are known, which contain a sensor with two electrostatic plates, isolating constant components of the sensor signals, integrating elements, a plastic difference amplifier and sum amplifier, keys, analog-digital converter, memory registers and a block. To determine the ratio of two numbers needed to eliminate the effect of beam intensity on the measurement result.

To obtain a result in known devices, a large amount of equipment is required.

The purpose of the invention is to simplify the beam position converter into a code by combining several operations: integration, determining the direction of beam deflection from the axis of symmetry of the sensor, and the division step. subtracting and digitizing the result.

This is achieved by using a push-pull integrating converter as the analog-to-digital converter, the low bits of the counter of which are connected to the output buses of the entire device through an information retrieval circuit in forward or reverse code. The control input of the circuit is connected to the output of the higher bit of the counter, the input of the integrator of the analog-digital converter is connected via a switch to one of the permanent circuit components and through another switch to the output of a summing amplifier.

FIG. 1 shows a block diagram of the device; in fig. 2 - diagrams of voltages at the output of the integrator and at the output of the higher discharge of the counter, indicating the characteristic points and time intervals.

Claims (1)

The block diagram contains a sensor J with electrically static plates, a circuit 2 of the selection of the constant component of the signals, summed. power amplifier 3, keys 4, 5 and 6 with diagrams) T1 ravary keys, voltage integrator 7, null organ 8, pulse generator 9, time interval counter,, information circuit R in the forward or reverse direction. The device works as follows. Signals from transducer 1 are converted to constant voltages Uj and U by circuits 2. Before measurement at the input of switch 4, the voltage is Uj, and at the input of switch 5, the voltage obtained at the output of inverting summing amplifier 3 is equal to Uj + U. All discharge the meter dusts are in the zero state. The pulse determining the moment of measuring the position of the beam to closes key 4 and the voltage Uj is applied to the input of integrator 7. At the same time, key 6 and the pulses from generator 9 are connected to the input of counter 10. The required integration time of 1 prestress Ui (first cycle) is determined The frequency of the pulse generation fon and the total volume of the counter NI: T,. With,., Ton., Step NI of pulses at the input of counter 10, all of the counter widow goes to the zero state, key 4 closes, key 5 opens and a second integrate begins (time f |). The integration of the voltage - (Uj +1) 2) ends at the time tj when the zero-organ 8 connected to the output of the integrator 7 is triggered. At this time the keys 5 and 6 are closed and the number of pulses Nj is fixed in the counter 10 proportional to the time interval of the second clock cycle integration. Since the integrals of the statements for the time of the first and second cycles are equal to 1, then Ta gg17t :: T, or N THGP; N, U + Ufl h The number NJ is always less than Nj and, depending on the ratio of the voltages U and Uj, can have different values. If Uj Uj uchak on the axis of symmetry of the sensor), then Na 5 with KI UU (beam deflection on one side), NZ -, with and, Beam deflection in the other direction) NJ -. Taking into account that the total volume of the junior bits of a binary counter is -, in the first two cases the unit is recorded in the old digit, in the last one - zero. So, in the high order of the counter, there is information about the sign of the deviation4 and the position of the center of gravity of the beam from the sensor's axis of immetry. Information on the deviation of the record in the lower bits of the counter. If a unit is written in the old bit, then this information is sent to the output ashns of the direct code device, if zero, then in the reverse code. In any case, the output of the device is the number N3, which is equal to the absolute difference between the number of pulses received in the clock during the second clock cycle NZ, and the number that is equal to the direct volume of the lowest bits of the clock iNa- l This number is proportional to the module of the vegaines. limited in the known N3 devices In comparison with the known devices, the proposed beam position transducer makes it possible to significantly reduce the amount of equipment used. The device can be used in accelerator orbit position measurement systems. Claims The position converter of a beam of charged particles into a digital code containing a sensor with electrostatic plates of a circuit for extracting constant components of the sensor signals, a summing amplifier, keys and an analog-to-digital converter, characterized by that, in order to simplify the device, a push-pull converter was used as an analog-to-digital converter: a converting converter whose low bits of the counter They are connected to the output targets of the entire device through a data acquisition circuit in a forward or reverse code, the control input of which is connected to the CTapiuero output of the counter, the input of the integrator of the analog-digital converter is connected via a key to one of the DC allocation circuitry and another key in the input of the summing amplifier. I / i  p-it eleven t I IT t Ft