Abstract
CF4 is used as a Cherenkov gas radiator in one of the Ring Imaging Cherenkov detectors at the LHCb experiment at the CERN Large Hadron Collider. CF4 is well known to have a high scintillation photon yield in the near and far VUV, UV and in the visible wavelength range. A large flux of scintillation photons in our photon detection acceptance between 200 and 800nm could compromise the particle identification efficiency. We will show that this scintillation photon emission system can be effectively quenched, consistent with radiationless transitions, with no significant impact on the photons resulting from Cherenkov radiation.
Highlights
IntroductionA photon detector with very high single-photon detection efficiency coupled with extremely low electronic background noise
CF4 is used as a Cherenkov gas radiator in one of the Ring Imaging Cherenkov detectors at the LHCb experiment at the CERN Large Hadron Collider
CF4 had been deemed unsuitable as Cherenkov radiator in other detectors due to the high scintillation yield, for detectors where the photon detection used VUV-sensitive imaging devices based on CsI, TMAE or TEA [4]
Summary
A photon detector with very high single-photon detection efficiency coupled with extremely low electronic background noise. At room temperature and pressure [6], give a factor $ 40 between the scintillation yields for the two gases (photons/ MeV deposited) in our wavelength range. These results indicated that the CF4 scintillation would not be a problem with a detection window above 200 nm; the distribution of scintillating photons is uniform whereas the optics of a Ring Imaging Cherenkov detector is inherently pointing. T. Blake et al / Nuclear Instruments and Methods in Physics Research A 791 (2015) 27–31 and laboratory measurements of the CF4 emission showed that the energy deposit per minimum ionizing particle would be 1.24 MeV with a scintillation yield of $ 1920 photons/MeV. The expectation, based on the above assumptions, was that the scintillation effect in RICH 2 would be detectable, but irrelevant for the particle identification efficiency
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
