Highlights
- •The response of a PMMA and silica optical fibre when exposed to 16.5 MeV protons is investigated.
- •A linear response observed in the change in ratio between the 460 nm and 650 nm peaks of the silica fibre.
- •Changes in PMMA emission spectrum are shown to be due to activation and photodarkening within the fibre.
Abstract
An investigation into the response of optical fibres to 16.5 MeV protons is presented
here. A silica and a poly(methyl methacrylate) (PMMA) optical fibre was exposed to
16.5 MeV protons from a GE PETtrace cyclotron. The optical fibres were exposed to
beam currents of 30nA – 270nA and the emission spectrum analysed. The silica fibre
was the most sensitive and had two main peaks at 460 nm and 650 nm. The ratio between
the peaks was observed to increase as irradiation of the fibres continued, where the
460 nm peak increased at a rate >4 times the 650 nm peak. The rate of increase of
the ratio between the peaks was observed to be constant at a constant target current
and linear with target current. In the case of the PMMA fibre, significant spectral
changes were observed during the exposure to 16.5 MeV protons. A simple method for
estimating the effect of photodarkening and activation is presented here and indicated
that the changes in the spectrum for the PMMA fibres may be due to photodarkening
and activation.
Keywords
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Article info
Publication history
Published online: August 06, 2019
Accepted:
August 1,
2019
Received in revised form:
July 19,
2019
Received:
March 23,
2019
Identification
Copyright
© 2019 Associazione Italiana di Fisica Medica. Published by Elsevier Ltd. All rights reserved.
