PWO Crystal Production and Quality Control at SIC

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Presentation transcript:

PWO Crystal Production and Quality Control at SIC Dr. Hui YUAN SIC and JLab. Collaboration meeting, Shanghai, 2018.07.23

Outline Modified Bridgman method PWO crystals production PWO quality control Summary

Crystal Growth Czochralski Bridgman High quality High cost High temperature High efficiency Low cost High flexibility

Modified Bridgman Method PWO Crystal Growth Parameters Speed：0.4-0.6 mm/h Gradient：20-50 C/cm Furnace temp：1170 C Seeding temp: 1045 C Furnace temperature profile

Modified Bridgman Method Profile of modified multi-crucibles Bridgman furnace

PWO CX for PrimEx 2001.5-2002.6, SICCAS provided PrimEx all 1275 PWOs.

PWO CX for PrimEx

PWO CX for CMS 2005.6-2008.3, SICCAS provided CMS more than 5000 PWO crystals, totally about 7.6 tons.

PWO Production Process flow diagram Recycle Weighting Polycrystalline Shaping Seeding Crystal Growth Ingots Annealing Machining Test Bench Products Crucibles Refining Pt Fragments Leak Checking

Production procedures: PWO Production Production procedures: Weighting PbO/WO3 + 150ppm Y Polycrystalline Mixture sintered/melted Shaping Compounds into crucibles with seeds Seeding Crucibles into furnace and heated Crystal growth Seeding temp reach and growth starts

Production procedures: PWO Production Production procedures: Ingots After finish, ingots got from crucibles 7. Annealing Low temp annealing to remove tension 8. Machining Cutting, grounding and polishing Test bench Transmittance, light yield and RH 10. Products About 8 weeks needed

PWO Production Key points: Lead time: 3-6 months Furnace tuning, raw material ordering, Pt rental PbO material Environmental policy restrict the PbO production Uniformity 30 cx in one growth, no forced convention 4. Crystal yield Growth * machining * performance

PWO Quality Control PbO material For each batch, to grow one sample to verify the quality. Second source may be needed. 2. Uniformity New furnaces are planned to be set up. 3. Radiation hardness Gamma-ray irrad facility has been moved. UV irrad will be applied to the ingots to verify its RH.

PWO Quality Control PbO material For each batch, to grow one sample to verify the quality. Second source may be needed. 2. Uniformity New furnaces are planned to be set up. 3. Radiation hardness Gamma-ray irrad facility has been moved. UV irrad will be applied to the ingots to verify its RH.

Summary 1. The PWO crystals can be produced with the Bridgeman technique. 2. Due to the environmental policy, PbO material supply is being reduced, and there is no nearby Gamma ray irrad facility. 3. New furnaces are planning to be set up.

Thanks!