Hit Density Research Articles

A tracking detector based on capillaries with liquid scintillator

A tracking detector with bundles of capillaries 20–25 μm in diameter and 0.4 m long, filled with a liquid scintillator based on the methylnaphthalene with a new dye MBMP, exposed to the 70 GeV/ c P + beam has been studied. An attenuation length of 60–80 cm at distances L > 20 cm is obtained. Hit density on a track at a distance L = 155 mm is n = 4.4 mm −1 and n 0 = 9.6 mm −1 at L = 0. A straight-line RMS residual is σ u ≅ 30 μm, the two track resolution is σ u = 57 μm. The light detected outside the track region (±3 σ u) is 14% of the total detected light.

Progress on high-resolution tracking with scintillating fibres: a new detector based on capillaries filled with liquid scintillator

The capabilities of a new detector based on capillaries filled with liquid scintillator have been investigated. Tests have been performed using various scintillating cocktails and readout systems. With the best combinations, and for light propagation over a few centimetres, the hit density is as high as 5 hits/mm. For propagation over distances greater than 10 cm, an attenuation length of ∼95 cm is measured. A spatial resolution of σ ≅ 12 μm is obtained with capillaries of 20 μm bore.

Design Optimisation of Parachute Sequencer Mechanism

Fragment hit density and hit probability of the warhead are the critical parameters in the selection of a preformed fragment-type missile warhead against ground targets. Hence these factors are to be maximised. The parametric studies of these factors have lead to a new concept of variable mass preformed fragmented (VMPF) warhead. A philosophy was evolved for the VMPF-type missile warheads. A computer software for generating the external configuration of the VMPF-type missile warhead was developed and basic algorithm is discussed in this paper. With this new design approach, the fragment hit density and hit probability were improved considerably in the shorter ranges, when compared to that of a uniform mass preformed fragmented warhead of conventional design.

Design Philosophy of variable Mass Preformed Fragmented Missile Warhead

Fragment hit density and hit probability of the warhead are the critical parameters in the selection of a preformed fragment-type missile warhead against ground targets. Hence these factors are to be maximised. The parametric studies of these factors have lead to a new concept of variable mass preformed fragmented (VMPF) warhead. A philosophy was evolved for the VMPF-type missile warheads. A computer software for generating the external configuration of the VMPF-type missile warhead was developed and basic algorithm is discussed in this paper. With this new design approach, the fragment hit density and hit probability were improved considerably in the shorter ranges, when compared to that of a uniform mass preformed fragmented warhead of conventional design.

Fragment Generator

AbstractThe design of a fragment generator and the determination of the hit density and of the velocity distribution are described in detail.From the correlation of the fragment hits on the target plate and the X‐ray flash radiographs it is possible to ascertain the launch angles in the elevation and azimuth directions and, hence, also to determine the true distances the fragments have traveled from the point of detonation of the high explosive charge to the location where the radiograph was taken. In this manner, a precise determination of the velocities of the individual fragments can be made.In spite of the rather large scatter of the depths of penetration of the cube‐shaped fragments in the mild‐steel target plate, a correlation can be established between the impact velocity and the depth of penetration.

A Cerium Glass Fiber-Optic Active Target for High Energy Physics Experiments

A fiber-optic plate imaging system has been developed for active target and tracking applications, in which the active element is Ce(3+) in a silicate glass. Particle tracks and interactions have been recorded with a hit density of ? 4/mm for minimum ionizing particles and with a spatial resolution ? ~ 28? m.

A Scintillation Camera for High Energy Physics

A scintillation camera has been developed for use as a triggerable vertex detector in high energy physics experiments. The device consists of a NaI(Tl) target viewed by a gated four-stage magnetically focussed image intensifier. Photographic film is used as the recording medium. In tests for use in an experiment to study charm, an interaction rate of 1.5 · 104/s was used, the resolution measured to be as good as 5 μm RMS, and the hit density found to be 4/mm.