Author/Authors :
M. Altmeier، نويسنده , , M and Bauer، نويسنده , , F and Bisplinghoff، نويسنده , , J and Bissel، نويسنده , , T and Bollmann، نويسنده , , R and Busch، نويسنده , , M and Büكer، نويسنده , , K and Colberg، نويسنده , , T and Demirِrs، نويسنده , , L and Diehl، نويسنده , , O and Dohrmann، نويسنده , , F and Engelhardt، نويسنده , , H.P and Eversheim، نويسنده , , P.D and Felden، نويسنده , , O and Gebel، نويسنده , , R and Glende، نويسنده , , M and Greiff، نويسنده , , J ، نويسنده ,
Abstract :
A novel scintillating fiber hodoscope in helically cylindric geometry has been developed for detection of low multiplicity events of fast protons and other light charged particles in the internal target experiment EDDA at the Cooler Synchrotron COSY. The hodoscope consists of 640 scintillating fibers (2.5 mm diameter), arranged in four layers surrounding the COSY beam pipe. The fibers are helically wound in opposing directions and read out individually using 16-channel photomultipliers connected to a modified commercial encoding system. The detector covers an angular range of 9°⩽Θ⩽72° and 0°⩽ϕ⩽360° in the lab frame. The detector length is 590 mm, the inner diameter 161 mm. Geometry and granularity of the hodoscope afford a position resolution of about 1.3 mm. The detector design took into consideration a maximum of reliability and a minimum of maintenance. An LED array may be used for monitoring purposes.
Keywords :
Scintillating fibers , Hodoscope , Multichannel photomultipliers , Vertex detector
