A compact 7-cell Si-drift detector module for high-count rate X-ray spectroscopy.

Area of Science:

• Physics
• Materials Science
• Instrumentation

Background:

• Fast X-ray spectroscopy experiments require detectors with high speed and resolution.
• Existing detector modules can be bulky, limiting proximity to specimens and multi-module configurations.

Purpose of the Study:

• To develop and realize a new silicon drift detector module optimized for fast X-ray spectroscopy.
• To enable closer specimen proximity and flexible multi-module arrangements through a compact design.

Main Methods:

• Designed a Peltier-cooled silicon drift detector module with a 7x7 mm² active area.
• Integrated amplification, shaping, detection, storage, and derandomized readout circuitry.
• Employed a compact, hexagonal module design with a 16mm wrench size.

Main Results:

• Achieved an electronic RMS noise of ~11 electrons at specific shaping and integration times.
• Obtained FWHM line widths of ~260 eV (Cu-Kα) at low rates and ~460 eV at 1.7 MHz.
• Demonstrated peak shift below 1% across a wide count rate range, with 30% throughput loss at 1.7 MHz.

Conclusions:

• The developed silicon drift detector module offers a compact and efficient solution for fast X-ray spectroscopy.
• The design facilitates close specimen proximity and multi-module setups, crucial for advanced experiments.
• The module provides good energy resolution and fast signal processing capabilities suitable for high-count-rate applications.