Abstract
The siliconvertexdetectoroftheBelleIIexperiment,structuredinalanternshape,consistsoffourlayers of ladders,fabricatedfromtwoto five siliconsensors.TheAPV25readoutASICchipsaremountedonone side oftheladdertominimizethesignalpathforreducingthecapacitivenoise;signalsfromthesensor backside aretransmittedtothechipbybent flexiblefan-outcircuits.Theladderisassembledusing severaldedicatedjigs.Sensormotiononthejigisminimizedbyvacuumchucking.Thegluingprocedure providessucharigidfoundationthatlaterleadstothedesiredwirebondingperformance. Thefullladder with electricallyfunctionalsensorsisconsistentlycompletedwithafullydevelopedassemblyprocedure, and itssensoroffsetsfromthedesignvaluesarefoundtobelessthan200 μm.
Thepotentialfunctionality of theladderisalsodemonstratedbytheradioactivesourcetest.