IBIC2015 - List of Authors (Gubeli, J.)

Paper	Title	Page
TUPB084	Cherenkov Converter for Large Dynamic Range, High Sensitivity Detectors for Use on Wire-Scanners	550
	J. Gubeli, P.E. Evtushenko JLab, Newport News, Virginia, USA
	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. *Work supported by US DOE office of Basic Energy Sciences under the early career program; DOE award number FWP#JLAB-BES11-05
	Poster TUPB084 [1.473 MB]
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Paper

Title

Page

Cherenkov Converter for Large Dynamic Range, High Sensitivity Detectors for Use on Wire-Scanners

550

J. Gubeli, P.E. Evtushenko
JLab, Newport News, Virginia, USA

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.
*Work supported by US DOE office of Basic Energy Sciences under the early career program; DOE award number FWP#JLAB-BES11-05

Poster TUPB084 [1.473 MB]

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)