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Purpose <p>Although high-speed waveform sampling has advanced high-precision timing, prohibitive data volumes and computational complexity have largely restricted these methods to laboratory-scale research. This study investigates data processing and digital timing algorithms to achieve an average per-channel time resolution of 68&#xa0;ps and an overall coincidence time spectrum of 187&#xa0;ps full width at half maximum (FWHM) in a 64-channel proof-of-concept. The optimized parameters are subsequently deployed in a 2048-channel system.</p> Methods <p>A genetic algorithm is trained on offline data to determine the optimal filtering and timing parameters specific to each channel. These parameters are then validated during online application.</p> Results <p>Achieving an average per-channel time resolution of 68&#xa0;ps and an overall coincidence time spectrum of 187&#xa0;ps FWHM in a 64-channel proof-of-concept, with the optimized parameters subsequently deployed in a 2048-channel system.</p> Conclusion <p>Online measurement of positron burst annihilation lifetime spectra has been achieved in a system comprising 2048 channels, enabling effective measurement and differentiation of standard samples such as metallic iron and polymer PC.</p>

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Genetic algorithm-optimized waveform digitizing timing for a 2048-channel positron burst annihilation lifetime measurement system

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • Wang Tianyi,
  • Wang Mian,
  • Wang Yingjie,
  • Yu Xiaotian,
  • Han Xiaorou,
  • Huang Xianchao,
  • Wei Long,
  • Zhang Zhiming

摘要

Purpose

Although high-speed waveform sampling has advanced high-precision timing, prohibitive data volumes and computational complexity have largely restricted these methods to laboratory-scale research. This study investigates data processing and digital timing algorithms to achieve an average per-channel time resolution of 68 ps and an overall coincidence time spectrum of 187 ps full width at half maximum (FWHM) in a 64-channel proof-of-concept. The optimized parameters are subsequently deployed in a 2048-channel system.

Methods

A genetic algorithm is trained on offline data to determine the optimal filtering and timing parameters specific to each channel. These parameters are then validated during online application.

Results

Achieving an average per-channel time resolution of 68 ps and an overall coincidence time spectrum of 187 ps FWHM in a 64-channel proof-of-concept, with the optimized parameters subsequently deployed in a 2048-channel system.

Conclusion

Online measurement of positron burst annihilation lifetime spectra has been achieved in a system comprising 2048 channels, enabling effective measurement and differentiation of standard samples such as metallic iron and polymer PC.