Radiation Induced Noise Signals in Diagnostic Cabling on the Advanced Test Accelerator

摘要

During the operation of the Advanced Test Accelerator (ATA) large radiation induced noise signals have been observed on the cables coming from beam current monitors and photomultiplier tubes in those areas of the beamline where beam current is lost. These signals are caused by Compton and pair production electrons produced by x-rays striking the coaxial cables. The induced signal is negative and ranges up to 5 volts in magnitude. The susceptibility of several different cable types and dielectrics has been experimentally investigated. Measurements of induced signal versus cable type and dose rate are given. These noise signals have been successfully eliminated by differencing out the radiation pickup. This technique will be discussed, and recommendations for cable shielding and routing, as well a choice of cable types to be used in high intensity radiation environments will be given. (ERA citation 11:051770)