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Status of SVD2 upgrade

Status of SVD2 upgrade. Koji Ueno National Taiwan U. 2003/2/13 @PSROC. Outline. Features of SVD2 Smaller beam pipe & more Si layers TTM( see Jerry’s talk) & Flex: done by NTU. Flex saga Low yield & spares Schedule & accident Beam pipe was broken Conclusion. Features of SVD2.

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Status of SVD2 upgrade

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  1. Status of SVD2 upgrade Koji Ueno National Taiwan U. 2003/2/13 @PSROC

  2. Outline • Features of SVD2 • Smaller beam pipe & more Si layers • TTM( see Jerry’s talk) & Flex: done by NTU. • Flex saga • Low yield & spares • Schedule & accident • Beam pipe was broken • Conclusion

  3. Features of SVD2 • Smaller beam pipe R = 2 cm --> 1.5 cm. • Originally 1 cm was planed. • More silicon layers 3 --> 4. • Originally 5 layers were planed. • Radiation-hard front-end electronics. • Up to 10 MRad is tested OK. • Z trigger. • Necessary to remove a beam-gas event.

  4. Belle SVD2 246 Double-sided Silicon Strip Detectors (DSSDs). Each DSSD has 512 z strips and 512 phi strips. Total no. read out is 250 k. It is reduced to 110 k by ‘ganging’. Ganging is done by FLEX.

  5. SVD2 system

  6. SVD1.x dose

  7. TTM & Flex • NTU is responsible for TTM & Flex. • TTM  see Jerry’s talk. • We finished them in spring, 2002. • They are now used in 1/10 system without a problem. • We need a spare Flex and SVD to prepare for an “accident”.

  8. Z-R trigger

  9. Efficiency for 3-out-of-4 layers

  10. Ganging in FLEX. DSSD Wire-bonding on Si and FLEX pads. FLEX Z strip Readout Signal Signal

  11. Ghost track due to ganging

  12. Flex saga • Flex task was supposedly easy. • Flex was in a crisis a year ago: low yield, bad wire-bonding, repair etc. • Laser beam was used to repair shorted lines to meet a deadline. • Only small no. of companies can make a Flex in the world. • Exchange of Flex info. among Belle, D0 and CDF.

  13. Laser surgery of shorted wire • The shorted wire is fixed by laser.

  14. 25 mm wire for bonding. Wire-bonding

  15. SVD2 schedule

  16. Integrated luminosity

  17. Peak luminosity of Belle & BaBar

  18. Space Shuttle Columbia accident

  19. SuperKamioka in repair

  20. Broken beam pipe

  21. Installation of 1.2 SVD HOM resonant heating Installation of 1.4 SVD Trouble of He cooling system

  22. The SVD2 first cosmic ray muon event Nov. 15, 2002

  23. Conclusion • SVD2 upgrade has a successful 1/10 system test. Has seen the 1st CR event. • It is likely installed in summer, 2003. • It aims for a higher luminosity. • We have to prepare a spare SVD and a spare Flex for an accident.

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