Page History

...

Link to the CLAS12 Forward Tagger TDR http://www.ge.infn.it/~batta/jlab/ft-tdr.2.0.pdf. You will find results of LY measurement with BCTP PbWO-II crystals coupled to PMT and a 10x10 APD at pg 27.

LY Light Yeld estimate for a ECal crystal (old BTCP PbWO) from the HPS proposal  pag. 157, top-left panel . These are the measurements we performed in Genova, with a HPS-like crystal (from CLAS-IC),  a LA-APD, and a FT-Cal amplifier. The mean energy deposited in the crystal by cosmics is ~ 15 MeV. The corresponding mean charge collected is ~ 25 pC.The amplifier and APD gain were, respectively, 1800 and 150.  Measure was performed at 18 +++ 1 deg. This gives an average LY of : 25 / (1800 * 150 * 1.6E-7 *15) ~ 35 phe / MeV 

...