The CheSS benchtop experiment will demonstrate the separation of Cherenkov and scintillation light
in different pure scintillator cocktels and in WbLS. In addition, it will characterize the new developed
WbLS by measuring the light yield and scintillation time constants. The so-called timing setup will account
on the first task, while the light setup will be in charge of the second.
The timing setup consists of a plane of several 1 inch PMTs distributed in a cross shape facing upwards to a small acrylic target filled with scintillator. Thanks to cosmic tags, we can trigger the adquisition when a vertical cosmic muon pass through the target creating both: a Cherenkov ring and isotropic scintillation light. These PMTs as well as our state-of-the-art electronics provide a great timing precision of 100ps making the time separation of the prompt Cherenkov and delayed scintillation lights possible.
The light setup is made up of 6 10 inches PMTs sourrounding the target and facing towards it, providing ~15% coverage of the light produced by the scintillation medium. The aim is collecting as much light as possible to perfectly understand the light yield and time characteristics of different scintillator cocktels, like WbLS.
Admixtures of linear-alkybencene (LAB) mixed with water at different loading levels (1%, 5%, 10% and pure LAB) provided by the Minfang Yeh group at Brookhaven are been tested and characterized at Berkeley.