1. Micromegas Bulk Demonstrator One type of Bulk: Active area; 115 mm for 288 strips, 500 mm long Material: 100 µm PCB, 5 µm Cu, 18µm mesh, 20µm Mylar Two type of structure, X and Y, for Bulk integration: Cylindrical for Y:  ext: 220 mm Tile for X:  int 180 mm One support for up to 3 X tiles and 3 Y cylinders: Channels: 1728 read by AFTER ASIC (T2K) Active area: 0.34 m² Dead zone between detectors not optimized on the prototype !!! Y cylinder X tile Support structure

2. Y cylinder X tile Y connector Y HT cable Y joint Interface attachment to handcart Length: 600 mm Diameter: 180 / 220 mm Magnet interface (3 Teflon pads) Cylindrical prototype Cylindrical Prototype

3. Out In The prototype is fixed on a mobile cart (telescopic slide rail) itself fixed on the magnet. The handcart allows full test in and out without dismounting the detector. Will be used for future test @ 5T with DVCS magnet. 400 mm Prototype « cart »

4. View with interface Electronics box detector HT filter Gas distribution DVCS magnet Telescopic slide rail Prototype inside CLAS+DVCS magnet

5. Goals: Dry test for test beam end 2008: full prototype on handcart Lorentz angle @ 5T: one X tile with UV laser Cosmic test @ 5T: Three X tiles. Goals: Beam test: full cylindrical prototype on cart Beam test: Forward prototype 2000-channel tests #1 and 2 1. During summer 2008, 5T test inside DVCS solenoid: 2. During change-out between e1-dvcs and eg1-dvcs(?), beam test:

6. Bulk made at CERN Flat test in Saclay Cylindrical drift & test in March Proto #2 to #4 under realization Detail view During Bulk realization Prototype #1 : realization (Jan.-Feb. 2008)

7. First Mesh test successful in air and gas Electronics test early march 300 µm Cu strips First flat test Prototype #1 : first tests at Saclay (Feb. 2008)

8. Monday Feb. 18th : Drift Al-mylar electrode laying (pillars implantation) v1 mechanical structure just arrived for laying/implantation studies Prototype #1 : Y Cylinder

9. 2007 0809101112132014 FeasabilityDefinitionDevelopmentProductionExperiment ABCDE Project Decision (Si and/or MM) Milestones Preliminary Design Review Production Readiness Review 2k-ch. v1 PrototypingForward CLAS12 2k-ch. v2 + elec. + DAQ B Final Design Review now 0809 Beam test5T test1.5T test now MM@CLAS12 planning