Miniature ionization chamber detector developed for X-ray microprobe measurements

Area of Science:

• Synchrotron Radiation Science
• Particle Detection Instrumentation

Background:

• Microprobe end-stations require precise beam intensity monitoring.
• Existing detectors may have limitations in size or proximity to samples.

Purpose of the Study:

• To develop and characterize a windowless small ionization chamber for microbeam monitoring.
• To evaluate its suitability for use at the ID18F microprobe end-station.

Main Methods:

• Designed a compact ionization chamber (10 mm x 5 mm).
• Incorporated a 50 micrometer pinhole for aperture definition.
• Tested technical characteristics including current-voltage curve, stability, and linearity.

Main Results:

• The detector's small dimensions allow close sample placement.
• The pinhole functions as an order-selecting aperture.
• Initial tests confirm stability and linearity for intensity measurements.

Conclusions:

• The developed windowless ionization chamber is a viable tool for microbeam intensity monitoring.
• Its design facilitates simultaneous intensity measurement and order selection.
• Further characterization supports its application in synchrotron radiation facilities.