On the linearity of the MINOS light-injection calibration system

Journal article

The MINOS light-injection calibration system has been fully documented in a previous article (Nucl. Instr. and Meth. A 492 (2002) 353). Upon commissioning in the MINOS detectors, the system was found to give a non-linear response to variations in the intensity of injected light. The source of this non-linearity has been traced to a small change in the spectrum of the injected light as a function of the current applied to the original blue LEDs, in combination with a rapidly varying spectral response function of the wavelength-shifting fibre used in the detector. Both aspects of the problem have been addressed successfully by use of LEDs with different spectral characteristics, and the system now has a linear response. © 2003 Elsevier B.V. All rights reserved.

Authors: Adamson, P; Barrett, L; Belias, A; Blake, A; Cabrera, A

• Publication status: Published
• Journal: NUCLEAR INSTRUMENTS and METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
• Volume: 521
• Issue: 2-3
• Pages: 361-366
• Publication date: 2004-04-01
• DOI: 10.1016/j.nima.2003.10.105
• ISSN: 0168-9002
• Language: English
• Keywords: light injection; calibration; LED; MINOS; PMT