Total Current Draw of CDC Total CDC current(8400 wires) has kept about 1mA at the maximum beam current for each years. Vacuum condition is improving from.

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Presentation transcript:

Total Current Draw of CDC Total CDC current(8400 wires) has kept about 1mA at the maximum beam current for each years. Vacuum condition is improving from year to year. Better masking system has been adopted for fixed masks near IP and movable masks in arc section.

Small Cell Drift Chamber

Small Cell Chamber Installation of the small cell chamberAfter removing Removing the cathode chamberJust after wire stringing

Small cell chamber is working. Hit histogram for layer 1, 2 and 3

XT Curve & Max. Drift Time Small cell(5.4mm) Normal cell(17.3mm)

Cross talk Signal cables between feed- through and preamp were replaced co- axial cables in order to reduce the cross talk during summer shutdown. Pulse Height Exp 31 Exp 27