High resolution tracking devices based on capillaries filled with liquid scintillator

The aim of this project is to develop high resolution tracking devices based on thin glass capillary arrays filled with liquid scintillator. This technique provides high hit densities and a position resolution better than 20 mu m. The radiation hardness of more than 100 Mrad makes capillary arrays superior to other types of tracking devices with comparable performance. The technique is attractive for inner tracking in collider experiments, micro-vertex devices, or active targets for short-lived particle detection in high-energy physics experiments. During 1996 and 1997, two prototype capillary bundles (1.8 m and 0.9 m in length) were put into operation. One of them was equipped with a conventional opto-electronic read-out chain and the other, for the first time, with a new device, the Electron-Bombarded CCD (EBCCD) imaging tube. The development of planar capillary layers is another aspect of the R&D activity. Details of the design and the performance are given

High resolution tracking using large capillary bundles filled with liquid scintillator

We have developed large high-resolution tracking detectors based on glass capillaries filled with organic liquid scintillator of high refractive index. These liquid-core scintillating optical fibres act simultaneously as detectors of charged particles and as image guides. Track images projected onto the readout end of a capillary bundle are visualized by an optoelectronic chain consisting of a set of image-intensifier tubes followed by a photosensitive CCD or by an EBCCD camera. Two prototype detectors, each composed of ≈ 106 capillaries with 20-25 μm diameter and 0.9-1.8 m length, have been tested, and a spatial resolution of the order of 20-40 μm has been attained. A high scintillation efficiency and a large light-attenuation length, in excess of 3 m, was achieved through special purification of the liquid scintillator. Along the tracks of minimum-ionizing particles, the hit densities obtained were approx. 8 hits/mm at the readout window, and approx. 3 hits/mm at approx. 1 m away. The level of radiation resistance of the prototype detectors is at least an order of magnitude higher than that of other tracking devices of comparable performance.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe