SU1481697A1 - Device for reading out coordinate data from single-dimensional wire detectors - Google Patents

Abstract

The invention relates to coordinate radiation detectors and can be used in high-intensity streams of charged particles. The purpose of the invention is the registration of many simultaneously passing particles and an increase in speed. The device contains a detector, the signal electrode of which consists of a large number of discrete elements (for example, an anode of a multiwire proportional chamber), two delay lines with different linear delay, four amplifiers for reading the coordinate information, and two recording channels (time-code converters). Odd discrete elements connected to the first delay line, and even - to the second. At the ends of the delay lines, amplifiers are connected to read the coordinate information, which are connected in pairs, one from each delay line, to the registration channels. The registration of the coordinate of the passage of the particle through the detector is determined by the time interval between arrivals of pulses into the registration channel from the ends of the delay lines, which is due to the difference in running delays between these lines and the coordinate of the interaction of the particle with the detector. 1 hp f-ly, 1 ill.

Description

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The invention relates to coordinate radiation detectors and can be used in laboratories engaged in research in the field of experimental physics, molecular biology, metal physics, conducted in high-intensity fluxes of charged particles or X-rays.

The purpose of the invention is to provide coordinate registration of many simultaneously passing parts and increase speed.

The drawing shows a block diagram of the proposed device.

The block diagram contains the detector electrode 1 (the electrode consists of discrete elements), delay lines 2 and 3, and a pulse voltage 4-7 for reading the coordinate information.

Electrode 1 DOTRKTP, i consists of discrete elements, odd discrete elements are connected to the line 2 delay, even to the line 3 delay (line 2 delay has a linear delay ,-, and line 3 delay - linear delay Јg Ј, + yC, where 0 ). Line 2 of the delay is connected to amplifiers 4 and 5 for reading the coordinate information, and line 3 of the delay is connected to amplifiers 6 and 7 for reading the coordinate information. In addition, the device includes two registration channels (not shown), which measure time intervals, convert the time interval to a code that carries information about the coordinate of the point of interaction of the particle (quatt) with the detector. The first registration channel measures the time interval between the signal coming from the amplifier 5 for reading the coordinate information (Start signal) and the signal from the amplifier 6 for reading the coordinate information (Stop signal) - the second registration channel measures the time interval between the signal come from amplifier 4 to read the coordinate information (start signal), and signal from amplifier 7 to read the coordinate information (stop signal).

The device works as follows.

The registered particle passes through the detector, as a result of the interaction of the particle with the substance of the detector on several elements of the electrode in the place of passage of the particle an electrical signal is generated, which arrives at the delay line and then at the amplifiers to read the coordinate information.

The event coordinate is determined in the first registration channel as follows.

The delay 2 delay signal (amplifier 5 for reading coordinate information) is the Start signal for the recording channel, which converts time to code, and the signal from delay line 3 (amplifier 6 for reading coordinate information) is Stop signal.

The measurement of time intervals can be carried out using modern digital or analog methods. For the event that occurred on the edge of the detector closest to the amplifiers, the time difference is equal to the cone. +0; on the far end + L & Ј, where L is the length of the detector. The dead time of the device has a variable value and in each specific case is equal to the value of the measured time interval.

The device allows simultaneous events to be recorded, but the presence of the dead time tM results in the appearance of an insensitive region (mm), when hit in which the event is not recorded. By knowing the value of the running delay Ј,, it can be expressed in terms of time interval b, where 6 Ј | (not (mm) & (mm). From the equality of the tM and Ј values, the value of the insensitive region S can be expressed in terms of the line parameters (d, Јg - Ј, + & координ) and the x coordinate of the event registration point L: LS-х, five

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for a maximum dead time equal to L. b.

For example, the parameters of the two devices are compared.

The known device has a sensitive length L 100 mm. The coordinate information is retrieved using the C 5 IC / mm delay line, has a dead time tM Ј L - 0.5 µs, and records the coordinates of the event when the detector registers only one event during 0.5 µs. In the case of the registration of two or more events, information about them is lost.

The proposed device with the same sensitive length, with two delay lines (Ј, 5 not / mm; Ј2 5.2 not / mm) has a variable dead time varying from 0 to 20 (not 20). The maximum value of the insensitive region J (L 0.2-100

“5 years to register at least L / 51,.

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max allow 25 simultaneous events. l

Reading the information on the parallel channel from the other ends of the delay lines makes it possible, if necessary, to further reduce the dead time of the device by a factor of two.

Modern methods of time interval measurement allow to provide the required coordinate accuracy.

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Claims (2)

1. A device for reading coordinate information from one-dimensional wire detectors, including a first delay line connected to discrete elements of wire electrodes, two amplifiers for reading coordinate information connected to different ends of the first delay line, and a recording channel connected to these amplifiers, distinguished by that, with a view Coordinate registration "5 litters for reading the coordinate many simultaneously passing information to the same ends of the lines of particles and speeding up, a second delay line having the value of linear delays. 2. The device pop. 1, differing from the fact that the delay lines delays that are different from the value of the 9P are connected to two different electrodes. And the second registration channel H dtorom registration channel 1481697 the delay of the first line, two additional amplifiers for reading the coordinate information and the registration channel, while the delay lines are connected to the electrode so that the even discrete elements of the electrode are connected to the first delay line, and the odd ones to the second line, and information is connected to different ends of the second delay line, and two registration channels are connected via amplifiers to read the coordinate information to the same ends of the lines delays. 2. The device pop. 1, differing from the fact that the delay lines N the first registration nanala  $ And the first registration report.