On the linearity of the MINOS light-injection calibration system

P Adamson ,R Lee ,A Belias ,J C Thomas ,Philip Harris ,G F Pearce ,P A Symes ,K Ruddick ,J K Nelson ,Philip Smith ,C Howcroft ,M Kordosky ,E Falk ,L W Barrett ,D Michael ,J Hartnell ,R J Nichol ,A Cabrera ,A Blake ,R Morse ,R Webb ,P Vahle ,J Liu ,K Lang ,A Weber ,R White

doi:10.1016/j.nima.2003.10.105

On the linearity of the MINOS light-injection calibration system

P Adamson , R Lee + Show 24 more

https://doi.org/10.1016/j.nima.2003.10.105

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Journal: Nuclear Inst. and Methods in Physics Research, A	Publication Date: Dec 11, 2003
Citations: 11

Affiliation: University College London, Princeton Plasma Physics Laboratory, Harvard University, Rutherford Appleton Laboratory, Fermi National Accelerator Laboratory, University of Sussex, University of Minnesota, University of Cambridge, The University of Texas at Austin, Western Washington University, California Institute of Technology, University of Oxford

#Use Of LEDs #MINOS Detectors + Show 8 more

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Abstract

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.

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