&lt;title&gt;Radiation resistance of optical fibres with fluorine-doped silica cladding&lt;/title&gt;

Dianov, Eugeni M.; Golant, K. M.; Khrapko, R. R.; Mashinsky, Valery M.; Neustruev, V. B.; Guryanov, A. N.; Gusovsky, D. D.; Miroshnichenko, S. I.; Sazhin, O.D.

doi:10.1117/12.198642

Cited by 7 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, when the objective is to keep the fiber transmission at the highest level under irradiation, RIA impact should be mitigated. The optical fiber material can be radiation hardened by reducing the concentration impurities or using fluorine to adjust the silica refractive index [25]. However, other dopants are also interesting for this aspect, e.g., it was shown that the Ce-codoping of rare-earth-doped optical fibers efficiently limits the infrared RIA [26,27].…”

Section: Introductionmentioning

confidence: 99%

Optical Fiber-Based Monitoring of X-ray Pulse Series from a Linear Accelerator

et al. 2021

View full text Add to dashboard Cite

We investigated in this work the radioluminescence properties of a Ce-doped multimode silica-based optical fiber (core diameter of 50 µm) manufactured by the sol–gel technique when exposed to the high-energy X-rays (~600 keV) of the ORIATRON facility of CEA. We demonstrated its potential to monitor in real-time the beam characteristics of this facility that can either operate in a pulsed regime (pulse duration of 4.8 µs, maximum repetition rate of 250 Hz) or in a quasi-continuous mode. The radiation-induced emission (radioluminescence and a minor Cerenkov contribution) linearly grew with the dose rate in the 15–130 mGy(SiO2)/s range, and the afterglow measured after each pulse was sufficiently limited to allow a clear measurement of pulse trains. A sensor with ~11 cm of sensitive Ce-doped fiber spliced to rad-hard fluorine-doped optical fiber, for the emitted light transport to the photomultiplier tube, exhibited interesting beam monitoring performance, even if the Cerenkov emission in the transport fiber was also considered (~5% of the signal). The beam monitoring potential of this class of optical fiber was demonstrated for such facilities and the possibilities of extending the dose rate range are discussed based on possible architecture choices such as fiber type, length or size.

show abstract

Section: Introductionmentioning

confidence: 99%

Optical Fiber-Based Monitoring of X-ray Pulse Series from a Linear Accelerator

et al. 2021

View full text Add to dashboard Cite

show abstract

Fiber Bragg gratings in the radiation environment: Change under the influence of radiolytic hydrogen

Butov

Golant

Shevtsov³

et al. 2015

Journal of Applied Physics

View full text Add to dashboard Cite

The change of the transmission spectra of fiber Bragg gratings written in the optical fibers, whose silica cores are doped with either germanium or nitrogen, is studied experimentally under the influence of gamma-radiation. The transmission spectra in the neighborhood of the resonance (Bragg) wavelengths were regularly recorded “in-situ” in the course of irradiation during 24 days. For this purpose, uncoated gratings were placed in a pool near the spent fuel rods of a nuclear reactor. The fibers with the gratings written in them were in immediate contact with water. The estimated total absorbed radiation dose of the fibers is approximately 5 MGy. Molecular hydrogen, which is produced by radiolysis of water and penetrates into the core of silica fiber, is found to interact with the defects of Ge-doped silica induced by gamma-radiation, thereby causing a strong impact on the parameters of the spectrum of the Bragg gratings. On the contrary, in the case of gratings inscribed in N-doped silica fibers, the hydrogen molecules interact with defects induced in the course of laser UV exposure during the grating writing only. The possible subsequent formation of additional defects in N-doped silica under the influence of gamma-radiation has no substantial impact on the transmission spectra of Bragg gratings, which remained stable. The obtained results suggest that a small amount of molecular hydrogen resided in the fiber core is the main source of radiation instability of Ge-doped fiber Bragg grating sensors in radiation environments. These hydrogen molecules can remain in the Bragg gratings, in particular, after the inscription process in the hydrogen-loaded fibers.

show abstract