A three layer circular scintillator hodoscope

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Abstract

The rotationally symmetric kinematics of hadronic reactions around the beam direction call for a detector system with an appropriate symmetry. A hodoscope has been invented which optimally meets such conditions. A combination of both contrarotating and straight scintillator elements form a three layer circular hodoscope. The overlap of individual counters defines pixels with a structure reminiscent of a sunflower pattern. Thus, a rather large, granulated and flat detector arrangement has been achieved economically. Such hodoscopes are in operation for measurements at LEAR/CERN and CELSIUS/Uppsala. A third enlarged version is presently being tested and will be used in the Time Of Flight spectrometer (TOF) at COSY/Jülich. The performance of individual detector elements and of the complete system was investigated with various particle beams and cosmic rays. Comparisons with Monte Carlo calculations confirm the operation of the detector.

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    Citation Excerpt :

    The geometrical constraints imposed upon FRI were: (i) A gap of at most 3 cm width available for insertion, while keeping full angular coverage of the range hodoscope (maximum diameter 144 cm); (ii) flexibility by fast insertion and retraction with no need for breaking the storage ring vacuum. Point (ii) excludes an otherwise preferential rotational symmetry around the beam direction [4]. The resulting final design is shown in Fig. 2.

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