SU1371254A1 - Device for measuring angle of multiple deflection of particle trace - Google Patents

Description

/ /

(21) 3977946/25

(22) 11/15/85

- (46) 03/23/91. Bul № 11

(71) Joint Institute for Nuclear Research

(72) György Benz (HJJ) and L.M. Soroko

(53) 621.387.424 (088.8)

(56) Kulagin S.V. and other Optical-mechanical devices. M .: Mashinostroenie, 1984, p.5.

(54) DEVICE FOR MEASURING THE ANGLE OF MULTIPLE SCATTERING OF TRACK OF PARTICLES

(57) The invention relates to experimental particle physics. The aim of the invention is to increase the angular resolution with a large field of view of the device. purpose

achieved by the fact that in a device containing an illumination system, a mesoscopic mirror with a cylindrical mirror surface, a photodetector, a rotation system of a mesooptical mirror and a photodetector around the optical axis of the device, a reference system of the angle of said rotation and a data recording unit, the focal length of the lens for forming a convergent light beam is 1 2A, where 1 is the distance between the lens to form a convergent light beam and a nuclear emulsion, A is the major semi-axis of the ellipse along which the conductive rotation system mezoopticheskogo mirror with a cylindrical mirror surface. 1 il.

i lO)

d U1

.eleven

The invention relates to experimental physics of elementary particles and can be used in the nuclear emulsion method.

The aim of the invention is to increase the angular resolution with a large field of view of the device.

The invention is illustrated in the drawing, which shows the proposed device.

It contains: a source 1 of a collimated light beam, a lens 2 for forming a convergent beam of light, a displacement system 3 for monitoring and controlling the position of a nuclear photo emulsion, a mesoptical mirror 4 with a cylindrical reflective surface, a photodetector 5, a system 6 for rotating a mesoptical mirror and a photodetector, a system 7 of the reference angle, the system 8 records the output information.

Rays of light, diffracted by the direct trace of a particle in a nuclear emulsion, fall on a mesoptical mirror 4 with a cylindrical mirror surface, are reflected from it and go to the photodetector 5. In a section of the rHfanbHOM cross section, the rays of light converge in a narrow crossover in the same place where is the crossover of light rays in the meridional section. The output signal thus generated is recorded in the photodetector 5 and recorded in the output information recording system 8. Data on the position of a nuclear emulsion from the system 3 of displacement and control of the position of a nuclear photo emulsion and data on the angle of rotation of the meso-optical mirror and photodetector from the system 7 of the angle of rotation are also recorded there.

The device works as follows.

The source of the collimated light beam 1, the system for moving and monitoring the position of the nuclear emulsion, the photodetector 5, the rotation system 6 of the meso-optical mirror and the photoreceiver, the rotation angle system 7 and the output recording system 8 are included.

The measured trace of a particle is installed with the help of system 3 into the center of the field of view of the device, defined by the axis of the beam of converging light after the lens. 2 to form a convergent4 -2

From the light beam, the rotation angle reading system, a mesoptical mirror with a cylindrical reflecting surface 4 and the photodetector 5 are set in a position near which the signal from the measured particle trace has a maximum value. Using the rotation system 6

scanning the angular coordinate of the signal from the measured particle trace, and, according to the angle of rotation reference system, find the half-width of the signal as a function of the angle A b. .

Having repaired the same sequence of measurements with a trace of a particle having an insignificantly small angle of multiple scattering, we find the calibration half-width db. A b, and.

L "9c, calculate d Lv) - (Two) - the average angle of multiple scattering of a given trace of a particle. If necessary, the measurements are repeated in other parts of the direct trace of the particle.

The angular blurring of the recorded signal at the output of the device has an extremely small amount, determined by the diffraction of light at an aperture equal to

diameter of the field of view of the device. In this case, the magnitude of the angle blur decreases with increasing diameter of the field of view of the device.

The device provides a significant increase in angular resolution,

Due to this, it can be used as a device for measuring the angle of multiple scattering of traces of particles in a nuclear photoemulsion.

Let us estimate the real value of the angle of multiple scattering of a particle trace, which can be measured using the proposed device. Let the diameter of the field of view of the device be D 6 mm, and the distance from the nuclear emulsion to the point where a crossover of light rays in the sagitaly section is formed is 2 A 250 mm. Then the linear size of the half-width of the signal and the sagital cross section lg |

about 2A 0.026 mm

Dh,

for l 0.63 μm, and the signal half width as a function of the angle

b8o - where R is the outer radius

TO

mesoptical mirror. For R "80 mm

Claims (1)

Claim A device for measuring the angle of multiple scattering of particle tracks, containing a collimated light beam source, a lens for generating a converging light beam, a system for moving and controlling the position of a nuclear photoemulsion, a meso-optical mirror with a cylindrical zeppal surface, a photodetector, a system of rotation of the meso-optical mirror and a photodetector around the optical axis devices, a reference system for the angle of the specified rotation, a system for recording output information, characterized in that, in order to exceed the angular resolution For a large field of view of the device, the focal length of the lens for forming a converging light beam is 1 + 2A, where 1 is the distance between the lens for forming a converging light beam and a nuclear photoemulsion, and A is the semimajor axis of the ellipse along which the guide of the mesoptical rotation system moves mirrors with a cylindrical mirror surface. VNIIIPI Order 1059 _________ Circulation 293 _______ Subscription Custom polygr. ave, city of Uzhhorod, st. Project, 4 I