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TY - CPAPER AU - Gubeli, J. AU - Evtushenko, P.E. TI - Cherenkov Converter for Large Dynamic Range, High Sensitivity Detectors for Use on Wire-Scanners J2 - Proc. of International Beam Instrumentation Conference (IBIC2015), Melbourne, Australia, 13-17 September 2015 AB - We are developing a wire-scanner with a dynamic range of 10⁺⁶ or larger. In addition to the large dynamic range (LDR), high sensitivity is very desirable so that measurements can be made with a small amount of beam or small duty cycle beam. This high sensitivity requirement makes photo multiplier tubes (PMT) the preferred detector. Low dark current PMTs have maximum quantum efficiency in the visible wavelength range. We describe a converter where Cherenkov radiation (CR) is used to generate visible photons from electrons and positrons that are present due to wire-beam interaction. Also described is an optical system that collects and couples the CR into an optical fiber that delivers the visible photons to the PMT outside of the accelerator area, reducing background. The directional nature of the CR is used in a way that, when CR in the radiating medium is generated by particles not directed from the wire-beam interaction point to the converter, the CR is not coupled into the optical fiber and therefore does not create background for the wire-scanner measurements. Sensitivities to the refractive index of the radiating medium, alignment and mechanical tolerances are also presented. PB - JACoW CY - Geneva, Switzerland SP - 550 EP - 553 KW - photon KW - radiation KW - electron KW - background KW - detector DA - 2016/01 PY - 2016 SN - 978-3-95450-176-2 DO - 10.18429/JACoW-IBIC2015-TUPB084 UR - http://accelconf.web.cern.ch/AccelConf/IBIC2015/papers/tupb084.pdf ER -