142A, B, and C Preamplifier

• Optimum performance for (A) low-, (B) medium-, and (C) high-capacitance charged-particle or heavy-ion detectors
• Extremely low noise
• Accepts 0 to ±1 kV bias
• Separate fast-timing output signal with rise time from <5 ns
• Operates in vacuum
• Small size

The ORTEC Models 142A, 142B, and 142C Preamplifiers are low-noise, fast-rise-time, charge-sensitive preamplifiers designed for optimum performance with charged-particle or heavy-ion detectors.

The Model 142A is optimized for extremely low noise and fast timing for detectors with capacitance up to 100 pF. This makes it the ideal selection for high-resolution alpha- and beta-particle spectroscopy applications.

Model 142B is optimized for extremely low noise and fast timing for detectors with capacitance greater than 100 pF but less than 400 pF.

Model 142C is optimized for extremely low noise and fast timing for detectors with capacitance greater than 400 pF.

These preamplifiers have a separate fast-timing output with pulse widths of ~ 50 ns and rise times ranging from less than 5 ns for 0 pF detectors to less than 20 ns for 1000 pF detectors. This timing output, when used in conjunction with ORTEC's standard electronics, provides excellent time resolution (Fig. 1); also, its fast-differentiated shape often permits direct coupling to the timing discriminator.

The performance of many spectroscopy systems can be enhanced by these preamplifiers being able to operate in vacuum enclosures. This allows the input cable length to be minimized. The small size of the preamplifier is of significant importance when operating in such enclosures due to the limited space available.

Fig. 1.  Typical Time Resolution vs. Energy for different capacitance detectors using ORTEC standard electronics

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