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Time LOG

SICCA J18

Date	Experimenter(s)	Description	Comments
12/14/2015	Marco	Pictures	Documentation of crystal's conditions as it arrived at CUA.
12/15/2015	Marco	Thermal annealing	Ramp up at 18oC/hour up to 200oC. Stays for 10 hours and ramp down at 18oC/hour.
12/17/2015	Marco	Long. Transmittance	Note: crystal NOT wrapped.
12/17/2015	Marco	Transverse Transmittance	Scan at 360, 420, and 620nm.
12/18/2015	Marco	Irradiation	160 keV photons at 6mA, for 10min.
12/18/2015	Marco	Transverse Transmittance	Scan at 360, 420, and 620nm after 30 min of irradiation.
01/05/2016	Marco	LY scan	At 100ns, as described in run 3047.
03/04/2016	Marco	Transverse Transmittance	At the center of the crystal, every nm from 200nm until 800nm. Sample: 1315
03/04/2016	Marco	Dimensions	Crystal's dimensions measured. Length and six points of width (3 in each face).
05/23/2016	Marco	Transverse Transmittance Scan	Wavelengths: 200-800 nm. Sampling period: 0.6s, moving motor at 2mm/s.
07/06/2016	Summer Students	Longitudinal Transmittance Scan	Wavelengths: 200-800 nm. Measured effect of off-center placement of crystal on transmittance. +1.3°, +2.3°, -1.3°, -2.3.
07/06/2016	Summer Students	Longitudinal Transmittance Scan	Wavelengths: 200-800 nm. Measured light beam entering both end face of crystal in spectrometer. "flip" of crystal.
07/07/2016	Summer Students	Longitudinal Transmittance Scan	Wavelengths: 200-800 nm. Measured effect of iris diameter on transmittace. 8mm, 11.5mm (used), 15mm, 17mm.
07/14/2016	Summer Students	Longitudinal Transmittance Scan	Wavelengths: 200-800 nm. Remeasured effect of off-center placement of crystal on transmittance BUT with removal of all residue/tape off 2x2 crystal face. +1.3°, +2.3°, -1.3°, -2.3.
07/21/2016	Summer Students	Light Yield (unmeasured)	Crystal accident , crack on 2x2 face of crystal.
07/28/2016	Summer Students	Transverse Transmittance	200-800nm wavelengths. 10cm down crystal.
12/20/2016	TH	Light Yield	run 3507: 11.28 pe/MeV, note: not a good fit to SEP, low stat run.
07/28/2016	Summer Students	Longitudinal Transmittance	200-800nm wavelengths. Sampling period: 0.6s, moving motor at 2mm/s.
07/07/2017	Summer Students	Longitudinal Transmittance	200-800nm wavelengths. Sampling period: 0.6s, moving motor at 2mm/s.
07/10/2017	Summer Students	Light Yield	Run 3691. 100ns gw. ~50,000 incidents ~3 layers of teflon tape ~1 layer of electrical. LY=10.01 pe/MeV.

Transmittance measurements

Longitudinal transmittance measured at Lambda 750 (no integrating sphere).
Longitudinal transmittance measured at Lambda 950 (integrating sphere).

Pictures at 12/14/2015

On July 21 when crystal was put in to test light yield (light yield was not taken).

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Transmittance Uncertainty

Iris Diameter vs Transmittance	Ideal crystal placement would be 20cm side parallel to light beam. Reasonable placement errors would be 1.3° and 2.3° off of this. At these angles the beam still appeared to fall within the crystla face under the "Align" function
Internal Symmetry of Crystal. "Flipping" the crystal by reversing which end-face the light beam hits first.