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IP chamber and monitor

IP chamber and monitor. 6 March 2003 T. Tsuboyama. Status of IP chamber for SVD1.6. Maximum beam current ~ 2400 mA Maximum temperature 51 o C (close to backward flange) Beryllium temperature with respect to the adjacent aluminum temperature ~ 5.1 o C

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IP chamber and monitor

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  1. IP chamber and monitor 6 March 2003 T. Tsuboyama

  2. Status of IP chamber for SVD1.6 • Maximum beam current ~ 2400 mA • Maximum temperature 51 oC (close to backward flange) • Beryllium temperature with respect to the adjacent aluminum temperature ~ 5.1 oC • These temperature rise may be within tolerance of the chamber. • KEKB people is struggling at this beam current. Higher current will not be beneficial to get higher luminosity for a while.

  3. Possible cause of the vacuum leak • Heat stress seems not the main reason. • Observation of BeO and Al2O3 powder on the beryllium chamber suggests existence of water in the helium gas. • Atmosphere oxygen is not harmful (Outer surface is healthy) • Dew point was > -10oC • Vapor water can corrode Be and Al directly in radiation environment. • We did not care about the contaminations in the gas. • Fortunately, dangerous elements, F, Cl, S was not observed in the gas. • Charcoal and silica-gel filters were installed since February in order to purify the heilum gas.

  4. Extraction of contaminations from the helium gas

  5. Monitors for SVD2 The installation was successful in general. (*1) Installed at slightly different position from design due to clearance problem. (*2) One hybrid cable came off after the ladder mount.

  6. Close up around the collision point X ray shield (0.3 mm thick Gold) RTD X ray shield (0.3 mm thick Gold) Radiation monitor hybrids RTDs • In the Belle acceptance a few RTDs were attached. Beryllium chamber with BR127 coating Radiation monitor hybrid electronics RTD

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