Unusual annealing of charge collection efficiency of silicon strip detectors, ATLAS18, irradiated to high fluences with 23 GeV protons

Mandić, Igor (author), Mikuž, Marko (author), Scharf, C. (author)

Extensive studies were performed on highly irradiated ATLAS18 mini strip detectors to evaluate their annealing behaviour. Collected charge was measured after several steps of annealing at 60 °C. For detectors irradiated with neutrons or low energy protons the collected charge exhibited a beneficial effect of short-term annealing which was followed by a decrease in charge collection efficiency at longer annealing times. After irradiation with 23 GeV protons to fluences above ɸ$_{eq}$ ∼ 1.2 ⋅ 10$^{15}$ cm$^{−2}$ , the collected charge remained unchanged or decreased after the first few tens of minutes of annealing. Edge-TCT measurements indicated that this unusual annealing behaviour is related to the double-peak electric field profile in the detector. Mixed irradiation with 23 GeV protons and neutrons to fluences matching the expected in the upgraded ATLAS experiment showed this unusual annealing effect will not impact the operation of the ITk strip detector.

• Language: English
• Keywords: hadron collider, Atlas experiment, silicon strip sensors, silicon strip detectors, charge collection, radiation hardness
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics
• Publication status: Published
• Publication version: Version of Record
• Year: 2025
• Number of pages: 4 str.
• Numbering: Vol. 1080, art. 170682
• PID: 20.500.12556/RUL-182536
• UDC: 539.1
• ISSN on article: 1872-9576
• DOI: 10.1016/j.nima.2025.170682
• COBISS.SI-ID: 247664899
• Publication date in RUL: 15.05.2026

Record is a part of a journal

• Title: Nuclear instruments and methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment
• Shortened title: Nucl. instrum. methods phys. res., Sect. A, Accel., spectrom. detect. assoc. equip.
• Publisher: Elsevier
• ISSN: 1872-9576
• COBISS.SI-ID: 175267331

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: senzorji, hadronski trkalnik, eksperiment Atlas, sevanje