Solid Xenon R&D Project

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Solid Xenon RD Project

• Vidya Anjur
• Mentor Jonghee Yoo

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Overview

• Solid Xenon as a target detector
• Dark matter
• Solar axions
• Neutrinoless double beta decay
• 2 phases
• Kg-size crystals of Xe were grown
• Readout scintillation/ionization signal

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Searching

• Dark Matter
• Solar Axions
• Neutrinoless Double Beta Decay

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Xenon chamber
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PMT

• Detects light signals light intensity

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Pic of oscilloscope

• Signal fed from PMT anode LED to oscilloscope
• Displays waveforms from electrical signal
• Clearly shows pulse from single photons
• Waveforms captured w/ LabVIEW

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• Downsides
• Expensive
• Easily damaged
• Excess noise
• Light leaks
• Overexposure to light
• Sensitivity to magnetic fields

Pic of PMT
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Xenon

• Solid is best
• Compact (high density)
• High melting point
• Higher yield of scintillation light
• Low background noise

Pic of Xe
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• Triple phase
• Gas purified beforehand
• Almost eliminates total reflection
• Need crystals
• Bragg scatteringamplifies light
• Less contamination
• Different particles different results
• Distinguish particles from results
• Property of Xe
• Heavierneutrons, alpha particles
• Lighterelectrons, photons

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LabVIEW

• Front panel picture

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• block diagram picture

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Results

• Single photon calibration
• Calculate electron gain FWHM
• Further statistical analysis with ROOT

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Electron Gain

• I Q/?t V IR
• V QR/?t
• ? ?t (Vi /R) Q (in C)

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• Full Width Half Maximum

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ROOT
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Conclusion

• Labview program successful
• Useful tool
• Collects stores data
• Visual during data collection

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Future

• Find optimal voltage
• Cold temperature
• Continue developing LabVIEW program
• Measure temperature
• Experiments with Xenon
• Compare different results
• Larger-scale experiments

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