Extraction of optical parameters in SNO+ with an in-situ optical calibration system Dr. Kalpana Singh On behalf of the SNO+ Collaboration CAP Congress.

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Presentation transcript:

Extraction of optical parameters in SNO+ with an in-situ optical calibration system Dr. Kalpana Singh On behalf of the SNO+ Collaboration CAP Congress 2015

Light Injection System Timing Calibration – 96 PMMA fibres – 504 nm LEDs Scattering Measurement – 12 collimated sources (gr. of 3) – 4 injection points, 3 directions – Multiple wavelengths Absorption length Monitoring – 4 injection points (group of 2) – 385 nm and 500 nm – 2 injection directions

Spatial and temporal distribution of Light Components Fibre Position Direct Light

Spatial and temporal distribution of Light Components Fibre Position Near AV Reflected Light

Spatial and temporal distribution of Light Components Fibre Position Far AV Reflection Late Light

Spatial and temporal distribution of Light Components Fibre Position PSUP Reflection Late Light

Spatial and temporal distribution of Light Components Fibre Position PSUP and AV Scattering

Monte Carlo tuning of fibre positions and pointing directions Data Fibre237 MC Fibre237 Direct Light Near AV Reflection Far AV Reflection

Sorting pmts based on angle PMT Fibre D   Direct Light on the other side of detector : cos  ~= 1  AV or PSUP reflections on fibre side: cos  ~= 0

Sorting pmts based on angle

Direct Light

Near AV Reflection

Far AV Reflection

Far PSUP Reflection

AV and PSUP Scattering

Direct Light Near AV Reflection Far AV and PSUP Reflection

Before Time Calibration After Time Calibration

Fibre data and Rope position

Monte Carlo Tracks of photons – Fibre is in front of Hold down rope

Rope Shadows and MC tuning DataMC

Tuning of rope coordinates and radius where vertical has coordinates (0,0,1) and R has coordinates at equator (z=0) of nearest rope to the fibre

MC tuning for rope radius and coordinates Blue – Data, Red – MC Nhit

MC tuning for rope radius and coordinates Nhit Radius = 19 mm Radius = 15 mm Radius = 12 mm

Outlook Commissioning data of fibres have been very useful in MC tuning – position and radius of ropes at different tensions. Fibres are meant to be used for time calibration and scattering measurement, data from empty detector is useful to extract optical parameters An algorithm is under development to quantify the scattered fraction of light – Angular distribution of PSUP surface scattering and reflections and its normalization – Angular distribution of AV surface scattering and reflection and its normalization