WLS Fiber Characterization (LEGEND)

Measured emission spectra and attenuation of wavelength-shifting fibers to optimize scintillation readout.

July 1, 2024
Optics SiPM Spectrometer Python Data Aquisition Data Analysis

A paper covering our work can be seen here!

Problem

Quantify light yield and attenuation in WLS fibers for low-background detector readout.

Normalized Emission Spectra Compared SiPM with Quantum Efficiency

Approach

  • Spectral scans vs. excitation; cut-back method for attenuation length.
  • SiPM coupling tests; fixture for repeatable alignment and distances.
  • Python analysis to fit attenuation and compare fiber batches.

Attenuation Length of Fibers

Impact

  • Data used to select fibers and routing for improved light collection.
  • Reusable fixtures and scripts for ongoing detector R&D.

Tech

  • Optics: coupling, alignment, spectral measurement
  • Sensors: SiPM biasing, dark-count handling
  • SW: Python analysis notebooks, curve fitting