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Mass Analyzers: Common Types01:19

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This study demonstrates a novel method for fabricating robust diamond radiation detectors. By using laser-written nano-carbon electrodes in thick diamond substrates, researchers achieved thin detector performance resilient to high radiation doses.

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Area of Science:

  • Materials Science
  • Nuclear Instrumentation
  • Detector Physics

Background:

  • Diamond offers excellent carrier transport and radiation tolerance for alpha/neutron detection.
  • High-dose radiation degrades diamond detectors by reducing carrier mean free path.
  • Thin detectors with reduced electrode spacing enhance radiation tolerance but use fragile substrates.

Purpose of the Study:

  • To develop a radiation-hard diamond detector using a thick substrate.
  • To overcome the fragility limitations of thin diamond substrates in detector fabrication.
  • To improve detector resolution and charge collection efficiency for high-radiation environments.

Main Methods:

  • Fabrication of a "thin" detector using a 300 μm thick diamond substrate.
  • Integration of a 3D network of laser-written nano-carbon electrodes.
  • Optimization of a femtosecond laser writing process with specialized optics.
  • Design of planar detectors with spiral Ti/Pt/Au and internal nano-carbon network electrodes (20 μm depth, 50 μm separation).

Main Results:

  • Successful fabrication of a diamond detector on a thick, resilient substrate.
  • Introduction of nano-carbon network electrodes significantly improved detector resolution.
  • Achieved near 100% charge collection efficiency and nanosecond rise times.
  • Demonstrated "thin" detector performance in a structurally robust, "thick" substrate.

Conclusions:

  • Laser-written nano-carbon electrodes enable high-performance diamond detectors on thick substrates.
  • This approach enhances radiation tolerance and overcomes substrate fragility issues.
  • The developed detectors are suitable for demanding applications requiring resilience to high radiation doses.