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Title: Construction and tests of a fine granularity lead-scintillating fibers calorimeter
Authors: Branchini, Paolo
Ceradini, Filippo
Corradi, Giovanni
Di Micco, Biagio
Passeri, Antonio
Keywords: Calorimeter
KLOE experiment
Scintillating fibers
Multi-anode photo-multiplier
Issue Date: Jan-2009
Publisher: Institute of Physics Publishing
Abstract: We report the construction and the tests of a small prototype of the lead-scintillating fiber calorimeter of the KLOE experiment, instrumented with multianode photomultipliers to obtain a 16 times finer readout granularity. The prototype is 15 cm wide, 15 radiation lengths deep and is made of 200 layers of fibers 50 cm long. On one side it is read out with an array of 3×5 multianode photomultipliers Hamamatsu type R8900-M16, each segmented with 4×4 anodes, the read out granularity being 240 pixels of 11×11 mm2 corresponding to about 64 scintillating fibers each. These are interfaced to the 6×6 mm2 pixeled photocathode with truncated pyramid light guides made of Bicron BC-800 plastic to partially transmit the UV light. Each photomultiplier provides also an OR of the 16 last dynodes that is used for trigger. The response of the individual anodes, their relative gain and cross-talk has been measured with the light (440 nm) of a laser illuminating only few fibers on the side opposite to the readout. We finally present the first results of the calorimeter response to cosmic rays in autotrigger mode.
DOI: 10.1088/1742-6596/160/1/012022
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'

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