142AH Preamplifier

• Optimum performance for charged-particle or heavy-ion detectors requiring high bias voltage with capacitances of up to 100 pF
• Extremely low noise
• Accepts 0 to ±5 kV bias
• Separate fast-timing output signal with rise time from <5 ns

The ORTEC Model 142AH Preamplifier was designed to meet the needs of experimenters who require optimum performance from their charged-particle or heavy-ion detectors. This requirement is satisfied by the charge-sensitive Model 142AH through its extremely low noise and fast-timing characteristics. It is particularly suitable for high-energy charged-particle spectroscopy where high-resolution detectors with capacitances of up to 100 pF and bias voltages of up to 5000 V are involved.

Model 142AH has a separate fast-timing output signal approximately 50 ns wide with rise times ranging from <5 ns for 0 pF detectors to <12 ns for 100 pF detectors. This feature enables it to be directly coupled to a timing discriminator for some applications.

When the Model 142AH is used in conjunction with ORTEC's standard electronics, excellent timing resolution is obtained (Fig. 1).

Fig. 1. Typical time resolution vs. energy for 90 and 27 pF detectors with ORTEC standard electronics.

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