MICRO VERTEX DETECTOR ZEUS experiment at DESY (HAMBURG) PROJECT SPECIFICATIONS : Design and production of a silicon Micro Vertex Detector (MVD) for the ZEUS experiment at the HERA accelerator in DESY (Hamburg). With this new detector the positions of the charged particles, which are produced by the electron-proton collisions, will be measured with extremely high precision (10 micron). PROJECT GROUPS : Desy-Hamburg, Desy-Zeuthen, Hamburg Un., Bonn Un. (Germany) Nikhef (Netherlands), Padova Un. (Italy), Oxford Un., UCL (UK), KEK (Japan) NIKHEF SUPPORT: Design and production of the silicon detector support structures. Assembly and precise geometrical measurement of the complete detector. Design and test of the cooling system for the readout electronics IMPORTANT DESIGN REQUIREMENTS: Extreme light and stiff construction to achieve: high position accuracy (5-10 micron) low radiation length, such that the trajectory of particles is hardly disturbed These requirements results in using high-tech materials and construction methods. MECHANICAL TECHNOLOGY GROUP Finish design state LADDER WITH SILICON DETECTORS WHEEL WITH SILICON DETECTORS SUPPORT STRUCTURE BEAMPIPE Physical design proposal Installation in ZEUS detector Start elaborate design idees Start prototype work Start production Detail designs

Designs and calculations are made with the help of the computer before production or manufacturing prototypes MECHANICAL TECHNOLOGY GROUP ZEUS MICRO VERTEX DETECTOR DESY COMPUTER AIDED DESIGNS (CAD) MODULE LADDER WHEEL Rear Barrel Flange Forward Barrel Flange Transport/ Assembly Frame

MECHANICAL TECHNOLOGY GROUP ZEUS MICRO VERTEX DETECTOR DESY FINITE ELEMENT CALCULATIONS COOLING TESTS LADDER DEFORMATION MODULE TEMPERATURE SIMULATION INFRARED PICTURE WHEEL DEFORMATION Mockup Cooling Setup COMPUTER AIDED DESIGNS (CAD) Ladder Assembly Jig

MECHANICAL TECHNOLOGY GROUP ZEUS MICRO VERTEX DETECTOR DESY PROTOTYPES Forward Barrel Flange Rear Barrel Flange Carbon Ladder Support Structure Carbonfibre/Nomex honeycomb shell Barrel + 3 ladders Barrel prototype Carbonfibre Wheel Support Structure

MECHANICAL TECHNOLOGY GROUP ZEUS MICRO VERTEX DETECTOR DESY PRODUCTION Carbonfibre/Nomex honeycomb sandwich shells produced at Composites Lab of Aerospace Technology (Haarlem University of Professional Education) Finish milling Wheel Support Structure Finish milling Rear Barrel Flange 3D measuring Wheel Support Structure 3D measuring Barrel Glue Jig Support Tube MVD Ladder Assembly Jig WORKSHOP AT NIKHEF Carbon Fibre Filled winding Wheel Support Structure Silicon Rotation Device Rear End Flange Rear Barrel Flange