|Author||D¨urr, M. ♦ Solevi, P. ♦ Joram, C. ♦ H¨ohne, C. ♦ Koczon, P. ♦ Braem, A.|
|Source||CERN Document Server|
|Subject Domain (in DDC)||Natural sciences & mathematics ♦ Physics ♦ Modern physics ♦ Technology ♦ Engineering & allied operations ♦ Applied physics|
|Subject Keyword||Wavelength shifter, RICH detector, Cherenkov radiation ♦ Detectors and Experimental Techniques|
|Abstract||P-terphenyl (PT) and tetraphenyl-butadiene (TPB) in form of thin films have been investigated as possible wavelength shifting material for application in Ring Imaging Cherenkov (RICH) detectors. Films of dierent thickness were evaporated onto borosilicate windows of photomultiplier tubes (PMT) and the quantum eciency of the modified PMTs was determined as a function of wavelength. Gain factors for the number of measured photoelectrons in dependence on the cuto wavelength (energy) for application in Cherenkov counters were established. Using PT, a strong increase in quantum eciency between 200 nm and 300 nm was observed leading to gain factors as high as 1.71 ± 0.11 for a cutoff energy of 6.2 eV. Due to strong absorption in the wavelength range between 300 nm and 400 nm, TPB shows inferior results. No significant thickness dependence was observed for films thicker than 600 nm. Film morphology and wavelength dependent fluorescence was measured to back the results. Simulations encourage the use on flat panel multi-anode photomultipliers.|
|Learning Resource Type||Technical Report|
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