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FP5

TECHNI Informe resumido

Project ID: HPRI-CT-1999-50005
Financiado con arreglo a: FP5-HUMAN POTENTIAL
País: Italy

Si/Gd microstrip 1-d detector for thermal neutrons

A new version of the Si/Gd detector for thermal neutrons has been developed, namely a 1-dimensional model of the microstrip Si sensor coupled to the fast and parallel VA32/TAN32 ASICS (IDE AS Norway) for signal processing. The detector consists of a 40 x 70mm{2} Si microstrip sensor with double Gd converter, 0.55mm space resolution and 128 parallel readout channels.

The sensor is mounted directly on the PCB, close to the preamplifier/shaper system, four VA32 ASICS with 75ns minimum peaking time and a CR-RC shaping function. The output signals from the sensor are AC-coupled to the preamplifier inputs by 1nF capacitors. The 128 shaper outputs are converted into digital pulses by four TAN32 asics, which include a two-level discriminator with different thresholds for each channel. Electrical tests of the detector were successful with excellent characteristics of signal to noise, linearity and cross talk.

The high space resolution and high counting rate, typical of the Si detector, are appealing features for operation under intense neutron fluxes. Specific to this detector model, are the very high speed, which improves the maximum instantaneous data rate achievable, and the rather high space resolution, which could be exploited in single crystal neutron diffraction applications.

Contacto

Caterina PETRILLO
Tel.: +39-75-5852723
Fax: +39-75-5852736
Correo electrónico
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