PKR-CAL detector, PbWO4 crystals characterization measurements

This dataset contains the data from the different characterization measurements of the PbWO4 crystals for the POKER PKR-CAL detector. Specifically, ten PbWO4 crystals from CRYTUR company were characterized, to assess their properties and determine the technical requirements for the samples to be used in the final detector. The size of the crystals is 20x20x250 mm3.

The file "LongitudinalTransmission.tar" reports the longitudinal transparency measurements performed at the CERN Crystals Laboratory, with a custom spectrophotometer. The spectrophotometer light beam is not polarized, and the crystal  optical axis is aligned perpendicularly to the small crystal face where the beam is impinging on. The file format is "%f %f", where the fist column reports the wavelength (in nm) and the second the optical transparency (in %). The name of each file reports the unique identifier of the crystal it refers to.

The file "TransverseTransmission.tar" contains the transverse transparency measurements performed at the Giessen University, using a Hitachi spectrophotometer. The spectrophotometer light beam is not polarized. The light beam has a transverse size (diameter) of about 0.5 cm. For each crystal, the transparency was measured at different positions along the crystal axis. The crystal was aligned so that the Z direction was perpendicular to the growing axis. Each file name is in the format "ID_POS_beforeIrradiation.dat", where "ID" is the unique crystal identifier provided by the manufacture, "POS" is the position along the axis where the measurement was taken (in units of 100 um). The file format is "%f %f", where the fist column reports the wavelenght (in nm) and the second the optical transparency (in %).

The file "LightYield.tar" contains the light yield measurements performed at the CERN crystals laboratory, using the "B3" facility. This is based on a setup where an XP2020 PMT is optically coupled to a crystal, and a 60Co source is used to excite the crystal and measure the corresponding light emission. Signals from the XP2020 PMT where acquired and processed with a digital oscilloscope (Lecroy WaveRunner). In the folder, the files "outID.txt", with "ID" being the measured crystal, contain the integrated spectrum from the measurement. The ROOT macro "ana_crs.cpp" can be used to processe these files. The two data-files "single1.txt" and "single2.txt" contains the measurements performed without the radioactive source, in order to normalize the spectra to single-phe units.

This dataset was scrutinized as part of the PKR-CAL crystals R&D, and the obtained results are reported in the PKR-CAL TDR document.