Status of SVD2 upgrade
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![Page 1: Status of SVD2 upgrade](https://reader030.fdocuments.us/reader030/viewer/2022013108/5681338f550346895d9a980e/html5/thumbnails/1.jpg)
Status of SVD2 upgrade
Koji Ueno
National Taiwan U.
2003/2/13 @PSROC
![Page 2: Status of SVD2 upgrade](https://reader030.fdocuments.us/reader030/viewer/2022013108/5681338f550346895d9a980e/html5/thumbnails/2.jpg)
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
![Page 3: Status of SVD2 upgrade](https://reader030.fdocuments.us/reader030/viewer/2022013108/5681338f550346895d9a980e/html5/thumbnails/3.jpg)
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.
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246 Double-sided Silicon Strip Detectors (DSSDs).
Each DSSD has 512 z strips and512 phi strips.
Total no. read out is 250 k.It is reduced to 110 k by ‘ganging’.
Ganging is done by FLEX.
Belle SVD2
![Page 5: Status of SVD2 upgrade](https://reader030.fdocuments.us/reader030/viewer/2022013108/5681338f550346895d9a980e/html5/thumbnails/5.jpg)
SVD2 system
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SVD1.x dose
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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”.
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Z-R trigger
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Efficiency for 3-out-of-4 layers
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Ganging in FLEX.
Z strip
DSSD
FLEX
Read outSignal Signal
Wire-bonding onSi and FLEX pads.
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Ghost track due to ganging
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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.
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Laser surgery of shorted wire
The shorted wire is fixed by laser.
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Wire-bonding
25 m wire for bonding.
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SVD2 schedule
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Integrated luminosity
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Peak luminosity of Belle & BaBar
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Space Shuttle Columbia accident
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SuperKamioka in repair
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Broken beam pipe
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Installation of 1.2 SVD
Installation of 1.4 SVDHOM resonant heating
Trouble of He cooling system
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The SVD2 first cosmic ray muon event
Nov. 15, 2002
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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.