NOE calorimeter assembly @ Napoli

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The calorimeter is made by a core of 12 $x$ planes interleaved with 12 $y$ planes surrounded by an external shell. Only $x$ planes were instrumented with fibers, PMTs and electronics. An active plane consists of 3 bars, made of iron boxes ($\sim \times 14 \times 140$ cm$^3$), filled with iron ore and scintillating fibers.

The external shell is made of 21 bars 13 cm $\times$ 13 cm $\times$ 140 cm, hosting 330 fibers each and readout by Hamamatsu R5686 PMTs (2 inches).

The overall dimensions of the calorimeter prototype are $(72.5 \times 140 \times 133)\ cm^3$, corresponding to a weight of about 4 tons. The average interaction length, radiation length and density are $\lambda_I \simeq 38$ cm, $X_{o} \simeq 5$ cm and $\rho \simeq 3.5$ g/cm$^{3}$ respectively. The total calorimeter thickness in the beam direction is 3.9$\lambda_I$ and 32.6 $X_{o}$.