Intelligent Preamplifier for HPGe Detectors
Optimized to perform high-resolution gamma spectroscopy and timing measurements, the iPA II is a low-noise, high speed resistive feedback preamplifier for High Purity Germanium (HPGe) detectors, enabling extensive control and monitoring of critical State-of-Health parameters of the preamplifier and detector.
When energy is deposited in the detector, the iPA II preamplifier converts the charge to a step-function output pulse. The output of this pulse is directly proportional to the total charge accumulated in the event.
A carefully selected low-noise field-effect transistor (FET) input circuit optimizes noise characteristics for ultra-high source impedance of germanium detectors. In addition, a protection network prevents damage to the preamplifier input from high-voltage transients.
The charge amplifier and buffer stages are designed to support the low-noise and high-speed performance needed for precise energy and timing spectroscopy. Special circuits monitor detector temperature and activity to warn when improper operating conditions exist.
An included USB 2.0 serial data interface supports extensive control and monitoring of critical preamplifier and detector functions. The iPA Control Panel software application provides real-time monitoring of the detector current and temperature, along with pertinent internal preamplifier operating voltages. The integrated data logging feature periodically records and stores key operating parameters in the iPA II preamplifier memory.
A standard test input and internal test pulser are provided to assist system setup and as a diagnostic aid. The internal test pulser is digitally controlled through the iPA Control Panel software.
The iPA II preamplifier is compatible with most MCA devices as it is provided with standard detector cable connections. When connected to the Lynx II MCA via USB, users can monitor critical data of the complete detector system - including the iPA II preamplifier - on one common platform. Insights into these data enable preventive measures to enhance equipment availability and productivity. Meanwhile, all the critical data are logged in the Lynx II on-board memory, which facilitates an efficient data-driven review process of the complete system when needed.
The iPA II detector also includes an integrated LN2 level monitoring circuit, for use with an optional Mirion capacitive LN2 level-sensing probe. The iPA II and probe work together to continuously measure the LN2 level within the Dewar. The measurement is displayed on the iPA Control Panel status screen, and warns the user when the LN2 level becomes low and the Dewar requires refilling.
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