Optical fiber waveguides in radiation environments, II

Friebele, E. J.; Askins, Charles G.; Gingerich, M. E.; Long, Keping

doi:10.1016/0168-583x(84)90092-2

Cited by 135 publications

(22 citation statements)

References 40 publications

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“…In addition, 10 experimental fibers from Heraeus -Amersil of varying chlorine and OH concentrations were examined at low doses (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) the Faraday cup correction factor changed significantly, and dose uncertainty for those fibers is substantially larger.…”

Section: Experimental Data and Discussionmentioning

confidence: 99%

Transient Attenuation In Optical Fibers

et al. 1984

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Low and high energy pulsed electron beams were used to generate radiation -induced transient attenuation in high -OH, Suprasil core, PCS fibers, demonstrating the energy dependence of the radiation damage and recovery mechanisms.A radiation resistant low -OH fiber was studied and its performance contrasted to that of high -OH material.Several fibers with differing core compositions were also studied.

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Section: Experimental Data and Discussionmentioning

confidence: 99%

Transient Attenuation In Optical Fibers

et al. 1984

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“…The early studies of the effect of ionising radiation on optical fibres and various possible mitigation strategies have been explored mainly for fission reactors applications, often using radioactive 60 Co sources. In these studies fibres with pure silica cores where investigated, since they were found to be least susceptible to radiation induced attenuation in the 800 nm -1.5 µm region used for optical communications [274]. This holds for both, short times following pulsed irradiation as well as long times after steady state exposure.…”

Section: Fibresmentioning

confidence: 99%

“…This holds for both, short times following pulsed irradiation as well as long times after steady state exposure. The radiation sensitivity of these fibres depends on their OH contend, with high OH fibres (sometime called 'wet' fibres) being least affected by radiation losses [274] in this spectral regime.…”

Section: Fibresmentioning

confidence: 99%

Diagnostics for steady state plasmas

Hartfuß¹,

König²,

Werner³

2006

Plasma Phys. Control. Fusion

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Problems related to the development of diagnostics for steady state fusion plasma experiments are being discussed. The paper concentrates on those necessities already appearing in nowadays non-burning plasma fusion experiments when extending pulse lengths beyond 10 s, i.e. thermal load, erosion, deposition, and long-time signal integration in magnetic diagnostics. Problems arising from high power ECRH under conditions of incomplete absorption are outlined. Individual standard diagnostic systems are discussed to identify their specific problems as well as the opportunities connected with long pulse operation. Burning plasma experiments characterized by intense n-and g-radiation are briefly reviewed for reasons of completeness, dealing with radiation induced processes in windows, fibres, cables, and mirrors. Methods of data handling, real time monitoring, and plasma control are outlined. Index

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“…The effect of ionizing radiation on optical fibers has been well documented in literature and already several decades ago it was known that an irradiated fiber will suffer from radiation induced attenuation (RIA) [1] [2]. Depending on the fiber's type and composition the RIA shows varying response to total dose, dose rate, temperature, wavelength and light power.…”

Section: Introductionmentioning

confidence: 99%

First steps towards a distributed optical fiber radiation sensing system

Toccafondo

Brügger

Pasquale

et al. 2017

International Conference on Space Optics — ICSO 2014

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Ionizing radiations affect installed electronics, limit equipment lifetimes and eventually alter materials both in space applications as well as high energy accelerators and physics experiments. In order to monitor radiation levels and predict equipment and material lifetimes, an accurate radiation dosimetry is highly important and very challenging often due to two main reasons: (i) large areas and (ii) extended dose range of interest. In this respect a radiation sensor based on a distributed optical fiber sensing system could be a promising solution. Such sensor systems are immune to electromagnetic field interference, have a light weight and small size making them suitable for a large number of applications including possible future space missions. In addition, optical fiber sensors have reached a very high accuracy in measuring physical quantities as a function of distance very accurately with metre or sub-metre-scale spatial resolutions. Their distributed nature in fact, is particularly suitable for real-time monitoring of long distances as particles accelerator tunnels like the one of the Large Hadron Collider (LHC) or large space stations as the International Space Station (ISS) which, to the best of our knowledge, only holds punctual radiation sensors as passive radiation dosimeters (PRD) among many others. The first step of the feasibility study of a distributed optical fiber radiation sensing system consists in characterizing and selecting the most suitable optical fiber which represents the sensing mean of the system. The effect of ionizing radiation on optical fibers has been well documented in literature and already several decades ago it was known that an irradiated fiber will suffer from radiation induced attenuation (RIA). Depending on the fiber’s type and composition the RIA shows varying response to total dose, dose rate, temperature, wavelength and light power. In the case of P-doped fibers, the radiation response is independent from the dose rate the fiber is exposed to, which makes it suitable for sensing a wide range of different radiation environments. Moreover, P-doped fibers have a low annealing behavior and their RIA doesn’t show any strong temperature dependence for room temperature environments. All the above mentioned parameters affecting the RIA are important in order to fully characterize fiber candidates to be used for dosimetry and will be detailed in the next section. Based on the above considerations, in this paper we investigate the response to ionizing radiation of three different P-doped optical fibers which could be suitable candidates for the radiation sensing system. Two of the fibers were single mode (SM) and the RIA has been studied at 1312 nm and 1570 nm as a function of the total dose up to about 18 kGy and with a dose rate of 46.7 mGy/s in one case and almost 60 kGy at 153 mGy/s in the other. The third fiber which was a multimode (MM) one has been tested at 830 nm and 1312 nm and has been irradiated with dose rates ranging from 0.5 mGy/s up to almost 1.7 Gy/s reaching ...

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Optical fiber waveguides in radiation environments, II

Cited by 135 publications

References 40 publications

Transient Attenuation In Optical Fibers

Transient Attenuation In Optical Fibers

Diagnostics for steady state plasmas

First steps towards a distributed optical fiber radiation sensing system

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