Radiation-hardness measurements of high OH - content quartz fibres irradiated with 24 GeV protons up to 1.25 Grad

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 585; no. 1; pp. 20 - 27
• Main Authors: Cankoçak, K., Bakırcı, M.N., Çerçi, S., Gülmez, E., Merlo, J.P., Onel, Y., Özok, F., Schmidt, I., Sönmez, N.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 21-01-2008
• Subjects: Attenuation; Fibre; Quartz; Radiation; Fibre; Attenuation; 01.30.−y; Quartz; Radiation
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2007.10.024

We investigated the darkening of two high
OH
-
content quartz fibres irradiated with 24
GeV protons at the Cern PS facility IRRAD. The two tested fibres have a 0.6
mm quartz core diameter, one with hard plastic cladding (qp) and the other with quartz cladding (qq). These fibres were exposed at about 1.25
Grad in 3 weeks. The fibres became opaque below 380
nm and in the range 580–650
nm. The darkening under irradiation and damage recovery after irradiation as a function of dose and time are similar to what we observed with electrons. The typical attenuation at 455
nm are
1.44
±
0.22
and
2.20
±
0.15
dB
/
m
at 100
Mrad for qp and qq fibres, respectively. The maximum damage recovery is also observed near this wavelength.