PWO based electromagnetic calorimetry to operate at a low temperature

  • Pavel O. Orsich Institute for Nuclear Problems, Belarusian State University, 11 Babrujskaja Street, Minsk 220006, Belarus https://orcid.org/0000-0001-7701-6439
  • Kai-Thomas Brinkmann Justus Liebig University Giessen, 16 Heinrich-Buff-Ring, Giessen D-35392, Germany
  • Valery I. Dormenev Justus Liebig University Giessen, 16 Heinrich-Buff-Ring, Giessen D-35392, Germany
  • Mikhail V. Korzhik Institute for Nuclear Problems, Belarusian State University, 11 Babrujskaja Street, Minsk 220006, Belarus
  • Vitaly A. Mechinsky Institute for Nuclear Problems, Belarusian State University, 11 Babrujskaja Street, Minsk 220006, Belarus
  • Dmitry Yu. Kozlov Institute for Nuclear Problems, Belarusian State University, 11 Babrujskaja Street, Minsk 220006, Belarus
  • Hans-Georg Zaunick Justus Liebig University Giessen, 16 Heinrich-Buff-Ring, Giessen D-35392, Germany
DOI: https://doi.org/10.33581/2520-2243-2021-3-67-73

Abstract

The degradation of the optical transmittance under ionising radiation of the scintillation crystal in the scintillation spectral range leads to the losses of the light output, which results in the deterioration of the energy resolution and limits the operation time of the calorimeter made of the scintillator. This effect is especially prominent for calorimeters operating at a low temperature. The use of a lead tungstate scintillation crystal PbWO4 in calorimetry at a low temperature in the range from –20 to –45 °C provides a threefold increase in its scintillation yield, which causes a significant improvement in the energy resolution in the range up to 10 MeV. Keep on this feature is critically important for hadron spectroscopy. However, as the temperature of the PbWO4 crystal is lowered, the rate of spontaneous relaxation of colour centers created under ionising radiation significantly slows down, which shifts the dynamic level of the induced absorption towards a higher value under long-term irradiation of high-energy physics experiments. A comparison is made of the spontaneous relaxation of induced absorption in the spectral region of scintillations with stimulated relaxation upon irradiation of samples by infrared photons of different wavelengths. It is shown that the relaxation of colour centers can be accelerated up to one thousand times. Thus, recovery stimulation allows fast and efficient in situ recovery of the crystal optical transmittance either at beam-off periods or online at data acquisition. The application can substantially improve or extend the running period of the PWO based calorimeters at low temperatures by keeping the radiation damage at a tolerable level.

Author Biographies

Pavel O. Orsich, Institute for Nuclear Problems, Belarusian State University, 11 Babrujskaja Street, Minsk 220006, Belarus

researcher at the laboratory of experimental high energy physics

Kai-Thomas Brinkmann, Justus Liebig University Giessen, 16 Heinrich-Buff-Ring, Giessen D-35392, Germany

doctor of science (physics and mathematics); professor at the 2nd Physics Institute

Valery I. Dormenev, Justus Liebig University Giessen, 16 Heinrich-Buff-Ring, Giessen D-35392, Germany

PhD (physics and mathematics); senior researcher at the 2nd Physics Institute

Mikhail V. Korzhik, Institute for Nuclear Problems, Belarusian State University, 11 Babrujskaja Street, Minsk 220006, Belarus

doctor of science (physics and mathematics); head of the laboratory of experimental high energy physics

Vitaly A. Mechinsky, Institute for Nuclear Problems, Belarusian State University, 11 Babrujskaja Street, Minsk 220006, Belarus

PhD (physics and mathematics); senior researcher at the laboratory of experimental high energy physics

Dmitry Yu. Kozlov, Institute for Nuclear Problems, Belarusian State University, 11 Babrujskaja Street, Minsk 220006, Belarus

researcher at the laboratory of experimental high energy physics

Hans-Georg Zaunick, Justus Liebig University Giessen, 16 Heinrich-Buff-Ring, Giessen D-35392, Germany

PhD (physics and mathematics); leading researcher at the 2nd Physics Institute

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Published
2021-10-13
Keywords: electromagnetic calorimetry, lead tungstate scintillation crystal, radiation damage, light yield, optical transmittance, stimulated recovery
How to Cite
Orsich, P. O., Brinkmann, K.-T., Dormenev, V. I., Korzhik, M. V., Mechinsky, V. A., Kozlov, D. Y., & Zaunick, H.-G. (2021). PWO based electromagnetic calorimetry to operate at a low temperature. Journal of the Belarusian State University. Physics, 3, 67-73. https://doi.org/10.33581/2520-2243-2021-3-67-73
Issue
No 3 (2021): Journal of the Belarusian State University. Physics
Section
Atomic Nucleus and Elementary Particle Physics

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