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Time LOG

CRYTUR 01

Date	Experimenter(s)	Description	Comments
xx/xx/2015	Marco	Wrapped	Preparing for light yield measurement. Approximately 5 layers of teflon tape, and 2 layers of black tape.
xx/xx/2015	Marco	LY scan	...
12/14/2015	Marco	unwrapped	Preparing for annealing.
12/14/2015	Marco	Thermal annealing	Starting 11:00AM. Ramp up at 18oC/hour until 200oC, stay at 200oC for 10 hours, ramp down at -18oC/hour.
12/17/2015	Marco	Longitudinal Transmittance	After annealing.
07/15/2016	Summer Students	Longitudinal Transmittance	Wavelength:200-800nm.
08/11/2016	Summer Students	LY scan	RUN:3411. Motor was lowered to approximately 5 cm down crystal. ~18oC. LY: 11.986 phe/MeV-
11/18/2016	Rich	Light Yield Scan	Run 3422: ~100 events; 10 cm crytur crystal wrapped with ~4 layers of teflon tape and 2 layers of black electrical tape. T=18°C. LY = 9.3978 pe/Mev (see pictures below). Not enough runs? Note: the error bars used were not the 0.5 standard used previously, but instead the calculated uncertainty for each run.
11/29/2016	Salina	Light Yield Scan	Run 3432: ~100K events; 10 cm crytur crystal wrapped with ~5 layers of teflon tape and 2 layers of black electrical tape. T=18°C. LY = 8.23 ± 1.08 pe/MeV. Not enough statistics? Need to re-run with more stats (see pictures below)
11/30/2016	Salina	Light Yield Scan	Run 3434: ~1.4M events; Re-run of 10 cm crytur crystal wrapped with ~5 layers of teflon tape and 2 layers of black electrical tape. T=18°C. LY = 9.67 ± 0.53 pe/MeV (see pictures below).
12/02/2016	Rich	Longitudinal Transmittance	Measured center of crystal before annealing.
12/20/2016	TH	Light Yield	already wrapped crystal, run 3502 start at 20degC and with source at same location as for 20-cm long crystals, result: 15.4 pe/MeV, run 3503 (better thermally equlibrated): 15.66 pe/MeV, run 3504 is same as before, but with other end of crystal taped shut, result: 14.76 pe/MeV, run 3505 is same as 3504, but with the source aligned to crystal center using stepper motor, result: 15.7 pe/MeV.

Transmittance measurements

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

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

Pictures at 12/14/2015

CRYTUR shown inside oven for thermal annealing.

Light Yield

Run 3422 taken on 11/18/2016: Fit of histogram with ~100K events.

Run 3422 taken on 11/18/2016: LY as a function of position. Error bars based off calculatd uncertainty.

Run 3432 taken on 11/29/2016: Fit of histogram with ~100K events.

Run 3432 taken on 11/29/2016: LY as a function of position.

Run 3434 taken on 11/29/2016: Fit of histogram with ~1.4M events.

Run 3434 taken on 11/29/2016: LY as a function of position.

Additional Data/Info

Graph showing CRYTUR crystal longitudinal measurements before annealing (red) and after annealing (green).

Graph showing the difference of the CRYTUR crystal longitudinal measurements before and after annealing.