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A single-crystal diamond X-ray pixel detector with embedded graphitic electrodes.

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Area of Science:

  • Materials Science
  • Particle Detectors
  • Synchrotron Radiation

Background:

  • Synchrotron X-ray beamlines require advanced diagnostic instruments.
  • Existing detectors can suffer from X-ray absorption and damage due to surface structures.
  • A transmissive detector with robust, non-surface components is needed.

Purpose of the Study:

  • To present the first experimental results of a new transmissive X-ray imaging detector.
  • To demonstrate the functionality of an all-carbon detector for synchrotron applications.
  • To evaluate the performance of a diamond-based detector with embedded graphitic electrodes.

Main Methods:

  • Fabrication of graphitic electrodes within bulk diamond using laser writing.
  • Development of a transmissive detector with two perpendicular arrays of graphitic wires.
  • Utilizing photoionization in diamond and a modulated electrical bias for charge carrier collection.
  • Employing a lock-in technique for simultaneous pixel readout.

Main Results:

  • The detector functions as an all-carbon transmissive X-ray imaging device.
  • Achieved a readout speed of 100 Hz.
  • Demonstrated X-ray beam position measurement resolution of 600 nm for a 180 µm beam.
  • The detector design avoids X-ray absorbing surface metallization and damaging surface structures.

Conclusions:

  • The novel diamond-based detector is suitable for synchrotron X-ray beamline diagnostics.
  • The all-carbon transmissive design offers advantages in terms of durability and minimal X-ray absorption.
  • The instrument provides high-resolution X-ray beam position measurements.