Measurements of the spatial-angular coordinates of the particle tracks in nuclear emulsion by means of the Fourier transform microscope

The results of the measurements of the spatial-angular coordinates of large array, -500, of tracks in nuclear emulsion from protons with energy of 250 GeV by means of the Fourier-transform (FT) microscope of the direct observation are presented. The average linear density of silver grains in these particle tracks was equal to 37.6±2.5 per 100 μm. The angular divergence of protons in the primary beam was ∼1 deg. The correspondence between the FT-pictures of proton tracks detected by means of the photodetectors and by means of the TV-system with CCD-matrix was proved unambiguously. The spatial resolution of the system (∼20 μm) and its angular resolution (∼1.0') were estimated. It is shown that in the optimal experimental conditions with illuminated region of the width 18 μm instead of 40 μm used in present experiments the system will enable one to detect and to measure the particle tracks with linear density of silver grains as small as 25 per 100 μm. 5 refs.; 12 figs