SUMMER INTERSHIP Electronics CERN BE-BI-BL Topic: photo-multiplier’s dynamic range improvements.

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Presentation transcript:

SUMMER INTERSHIP Electronics CERN BE-BI-BL Topic: photo-multiplier’s dynamic range improvements

DESIGN OF PM’s ELECTRICAL POWER SUPPLY

CONSTRAINTS 10 mA max signal (gaussian curve) Loading time of the system Maximum supplyable current

Capacitor Sizing Rd R11 C11 x X = max signal amplitude t = Pulse duration C > 100 Q/V C > [ 100 x*t*Rd+R11] / [(-Hv )*R11] t -Hv

Loading système constraints 1 ms t 100 ms5τ τ = R11*C11 < T / 2,5 2,5τ T 99% T=2,5τ Exp(-t/τ) > 0,99  τ < - t / ln(0,99) t = discharge time

Maximum supplyable current -Hv Imax Rd > (-Hv*R11) / (Imax*(R11+Rd))

Conclusion Rd > (-Hv*R11) / (Imax*(R11+Rd)) τ < - t / ln(0,99) τ = R11*C11 < T / 2,5 C > [ 100 x*t*Rd+R11] / [(-Hv )*R11] First results: - Rd=1MΩ - C=10μF

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