Nu Xu SICCAS, Shanghai, Nov. 15-16, 2005 1

SICCAS visit

Ioan Dafinei (Rome) Andrea Giuliani (Como) Eric Norman (Livermore)Ezio Previtali (Milano) Nu Xu (Berkeley)

- Background in TeO2 powder- Crystal dimension accuracy- Mass production and storage

Nu Xu SICCAS, Shanghai, Nov. 15-16, 2005 2

The Technical Process of TeO2 Raw Materials

二氧化碲原料处理工艺流程图

Te

过滤Filtration

化学反应 : TeO2+HCl→TeCl4+H2O

Chemical reaction

洗涤Washing

TeO2

化学反应 : 2Te+9HNO3 → Te2O3(OH)NO3+8NO2+4H2O

Chemical reaction: Te2O3(OH)NO3→2 TeO2+HNO3

洗涤Washing

干燥去Dryness

离心Removing water

洗涤Washing

化学反应 : TeCl4+4NH4OH→Te(OH)4+4NH4Cl

Chemical reaction: Te(OH)4→TeO2+H2O

HNO3

HClNH4OH

Water sample and filter brought back to Milano for background check

Nu Xu SICCAS, Shanghai, Nov. 15-16, 2005 3

Preparing Pt Material

ZengWei Ge

Nu Xu SICCAS, Shanghai, Nov. 15-16, 2005 4

Pt Crucible

Nu Xu SICCAS, Shanghai, Nov. 15-16, 2005 5

Preparing Crystals

Nu Xu SICCAS, Shanghai, Nov. 15-16, 2005 6

Crystals Growing

Remove dirt

Grew crystals

Material preparing

- 9 week/circle- several TeO2

- lower T to reduce Pt

- few months after contract batches of TeO2 shipping possible- 18-24 months to finish 1000 crystals- accuracy: 0.05mm- SINAP: 50m well mass storage

Nu Xu SICCAS, Shanghai, Nov. 15-16, 2005 7

Production Site - Jiading

Scientific Satellite City: Jiading

- Nuclear research institute: SINAP - SICCAS production site - Shanghai University … ~ One hr. drive from downtown

CAS Shanghai branch

Nu Xu SICCAS, Shanghai, Nov. 15-16, 2005 8

Summary

• SICCAS: professional, very cooperative

• Site: Easy access, friendly people, good food