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1 July 2009 SVD meeting

1 July 2009 SVD meeting. SVD operation . Belle spring operation f inished safely. No serious problems so far. Full depletion voltage > 70 V ( No change since 2003). Water leak in the cooling water circulation system. Pump. Will be fixed by the start of next DAQ (14 October).

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1 July 2009 SVD meeting

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  1. 1 July 2009 SVD meeting

  2. SVD operation • Belle spring operation finished safely. • No serious problems so far. • Full depletion voltage > 70 V ( No change since 2003). • Water leak in the cooling water circulation system. Pump. Will be fixed by the start of next DAQ (14 October). • Belle end cap detectors will be removed for CDC leaky wire operation. SVD can not be accessed.

  3. DSSD • HPK decided to restart DSSD production. • Test production will be done this fiscal year. • Real “testable” sensor will be produced in the next fiscal year. • Meanwhile, test production by SINTEF and Micron will be continued. • RFQ (when?) • Bidding process by Japan agency company will be necessary.

  4. Discussion with Mechanics people • There are several requests. • One is if it is possible to glue “ribs” directly to sensors. • Kapton circuit will be glued on top of the ribs. • Another Windmill structure • Installation of the last ladder with a slant sensor in each layer seems to be difficult, if not impossible. • Ladder mount is done while the support structure is separated. Finally two halfs are put together. • How do we asure the accuracy?  Need more discussions APV25 Cooling tube DSSD sensors Ribs

  5. Super KEKB IP chamber • KEKB people now only discuss on the nano beam option only. • The radius of beam apertures in the final focus Super conducting Q magnets can not be larger than 10 (or 10.5) mm. • The beam pipe radius is automatically same or smaller than 10(.5) mm. • Still synchrotron radiation is better than in the high-current option. • BKG/SR calculation will be done by the IR group lead by M. Iwasaki.

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