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Fast non inverting preamplifier, negative output (EOUT)
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Input impedance: 50 Ω AC coupled
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Output high impedance (EOUT)
For Fission Chambers and Proton Recoil detectors
Electronics for Fission Chambers / Proton Recoil
The A1427–A1428 kit combines a fast, low-noise current preamplifier with a leading-edge discriminator, providing a complete front-end solution for neutron and charged-particle detectors. Originally developed by CEA Saclay for the Cabri reactor in Cadarache, the system is suitable for fission chambers, boron deposition proportional counters, ^3He counters, and proton recoil detectors.
The preamplifier features AC-coupled input, high gain, and low noise, while the discriminator offers precise threshold control for negative pulses and high-rate operation. The kit is available in versions optimized for fission chamber or proton recoil applications, both for laboratory use and for reactor environments.
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Fast low-noise preamplifier with AC-coupled 50 Ω input and high dynamic gain
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Integrated leading-edge discriminator with adjustable threshold (−1 to −100 mV)
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Supports fission chambers, boron counters, ^3He and proton recoil detectors
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Detector bias up to 3 kV with low-noise performance and MHz-rate capability
For Fission Chambers and Proton Recoil detectors Models
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A1427
A1427 KIT
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Fast non inverting preamplifier, negative output (EOUT)
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Input impedance: 50 Ω AC coupled
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Output high impedance (EOUT)
A1428
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Input polarity negative
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Input impedance 50 Ω
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Threshold -1 mV to -100 mV
A1427
Low noise fast current neutron flux preamplifier
A1427 is a fast and low noise current preamplifier with AC coupled input. It hosts two outputs: EOUT (unipolar) that can be integrated to calculate the energy associated to the input signal and FOUT (bipolar) that can be used to calculate the rate of the input signal, discriminating the negative pole using the A1428 discriminator that is specifically designed to fit with A1427. The discriminator thresholds is settable from -1 to -100 mV via a 10 turn rotary handle with lock. A1427 Kit configuration is also available, it includes the A1427 and the A1428 assembled together, both for fission chambers and for proton recoil detectors.
A1427 Kit
Low noise fast current preamplifier and discriminator
A1427 Kit contains a fast preamplifier (A1427) and a discriminator (A1428) assembled together. A1427 is a fast and low noise current preamplifier with AC coupled input. The discriminator thresholds is settable from -1 to -100 mV via a 10 turn rotary handle with lock. The Kit is available in two different versions one for fission chambers (FC) the other for proton recoil detectors (PR). We provide A1427 and A1428 separately and in the A1427 Kit configuration, that includes the A1427 and the A1428 assembled together, both for fission chambers and for proton recoil detectors.
A1428
Discriminator for Low noise fast current neutron flux preamplifier
The A1428 is a leading-edge discriminator designed for negative pulses, with thresholds values into the range from -1 mV to -100 mV. It’s suited to work with A1427, a fast and low noise current preamplifier with AC coupled input which hosts two outputs to calculate the energy associated to the input signal and the rate. A1427 Kit configuration is also available, that includes the A1427 and the A1428 assembled together, both for fission chambers and for proton recoil detectors.
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