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Studio di fotodiodi a valanga per il calorimetro CMS al LHC del CERN"

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M<br />

10 3<br />

10 2<br />

T=-5.7 o C<br />

T=-2.5 o C<br />

T=0.6 o C<br />

T=4.2 o C<br />

T=8.1 o C<br />

T=18.1 o C<br />

T=21.9 o C<br />

1/M dM/dT (1/ o C)<br />

0<br />

-0.01<br />

-0.02<br />

-0.03<br />

-0.04<br />

-0.05<br />

150 160 170 180 190 200 210<br />

V(V)<br />

-0.06<br />

0 10 20 30 40 50 60 70 80 90 100<br />

M<br />

(a)<br />

(b)<br />

Figura 3.13: (a) Curve <strong>del</strong> guadagno a tem<strong>per</strong>ature <strong>di</strong>erenti <strong>per</strong> <strong>il</strong> prototipo BA-N; (b)<br />

Coeciente <strong>di</strong> tem<strong>per</strong>atura <strong>del</strong> guadagno <strong>per</strong> <strong>il</strong> prototipo BA-N.<br />

n<br />

0.5<br />

0.45<br />

0.4<br />

V b (V)<br />

225<br />

220<br />

0.35<br />

215<br />

0.3<br />

0.25<br />

0.2<br />

210<br />

205<br />

0.15<br />

200<br />

0.1<br />

0.05<br />

195<br />

0<br />

-5 0 5 10 15 20<br />

T( o C)<br />

190<br />

-5 0 5 10 15 20<br />

T( o C)<br />

(a)<br />

(b)<br />

Figura 3.14: Dipendenza d<strong>al</strong>la tem<strong>per</strong>atura <strong>di</strong> n e V b <strong>per</strong> <strong>il</strong> prototpo BA-N <strong>del</strong>la Hamamatsu.<br />

70

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