Degradation of electrical properties of coaxial cables

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Introduction

At Helmholtz-Zentrum Dresden-Rossendorf (HZDR) two types of coaxial cable have been exposed to ionizing radiation from October 2015 to October 2016. The first sample was a 8 meter piece of Teledyne Storm Microwave Phase Master® 160 and the second sample a 10 meter piece of Harbour Industries LL142.

They were installed on the back of a beam dump at the ELBE FEL (U100) and connected with two times 5 meter long patch cable LL142. In this location the samples experienced a gamma radiation shower generated by the decelerated electrons in the beam dump - so called „Bremsstrahlung“.

Since both samples have been installed in this location at same time they experienced the same radiative field.