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Time LOG

SICCA J27
Date Description Comments
03/09/2016 Pictures Documentation of crystal's conditions as it arrived at CUA.
03/09/2016 Dimensions Crystal's dimensions measured. Length and six points of width (3 in each face).
03/18/2016 Thermal annealing Ramp up at 18oC/hour up to 200oC. Stays for 10 hours and ramp down at 18oC/hour.
04/01/2016 Light Yield Run 3168: crystal wrapped with ~5 layers of teflon tape and 2 layers of black tape. Steps of 20min, 1cm. T=18oC. LY = 17.95 pe/MeV.
05/17/2016 Transverse Transmittance At the center of the crystal, every nm from 200nm until 800nm. Sample: 1344
05/20/2016 Transverse Transmittance Scan Wavelengths: 360nm, 420nm, 620nm. Sampling period: 0.6s, moving motor at 2mm/s.
07/06/2016 Longitudinal Transmittance Scan Wavelengths: 200-800nm. Sampling period: 0.6s, moving motor at 2mm/s.
07/21/2016 Light Yield Run:3236 ~3layers of teflon tape and 1 layer of black tape. ~50,000 incidents recorded at ~18 degrees Celsius.

Pictures at 03/09/2016

Three cracks on edge of crystal shown.