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TY - CONF AU - Liu, Y. AU - Blokland, W. AU - Bryan, J.D. AU - Rakhman, A. AU - Riemer, B.W. AU - Sangrey, R.L. AU - Strum, R. AU - Wendel, M. AU - Winder, D.E. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - Radiation-Resistant Fiber Optic Strain Sensors for SNS Target Instrumentation J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - Measurement of stresses and strains in the mercury target vessel of the Spallation Neutron Source (SNS) is important to understand the structural dynamics of the target. Owing to their compactness, easy system integration, and invulnerability to the electromagnetic interference, fiber optic strain sensors have been installed into the SNS target module starting from the fall of 2015. In this talk, we report on the development of radiation-resistant fiber optic strain sensors for subsequent generations of SNS target instrumentation. The sensors are extrinsic Fabry-Perot interferometers (EFPIs) made from fluorine-doped single-mode fibers. The radiation induced loss of the fiber has been measured in the SNS target 13 at the energy-on-target level exceeding 500 MWhr which results in peak doses on fiber of more than 10⁹ Gy. A superluminescent diode laser at 1300 nm is used as the light source and the strain is measured in real-time using quadrature phase shifted signals generated from a local interferometer. We have demonstrated successful measurements of strains from 1 to 1000 με at a kHz frequency range on a test plate using the developed interrogation optical system. PB - JACoW CP - Geneva, Switzerland SP - 371 EP - 373 KW - target KW - radiation KW - neutron KW - proton KW - detector DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-MOPMR055 UR - http://jacow.org/ipac2016/papers/mopmr055.pdf ER -