1. Large GEM prototype production NS2 technique

2. Reminder NS2 technic 10 to 15mm Readout connector O-ring Drift electrode Free to slide External screws to adjust stretching GND GEM attaching structure (4 pieces defining gaps) Embedded nut O-ring Rui De Oliveira GEM workshop IV

3. Internal frame 1st part (1mm thick). 1st GEM

4. Internal frame 2nd part (2mm thick). 2nd GEM

5. Internal frame 3nd part (1mm thick). 3rd GEM

6. Internal frame last part (3mm thick).

8. Springs Modifications from previous prototypes Some modifications has been made on the external frame due to integration issues. A patch pannel is being made at Aachen. We will use professional spring contact probes for the HV connections on the GEM.

9. Status and Plan Internal frame in production. Drift board and readout board will be made in an external company during february. After discussions external frame will be made at CERN (first idea was Aachen but tools are not suitable). Specific tools has to be made for this work. The GEM are ordered, and expected to arrive by the end of february. All the components (screws nuts orings 10Mresistors and panasonic connectors )are ordered. The assembly will be made during march.

10. Dummies production SEQUENCE OF TRIALS Goal: validate the geometry and the good insertion in CMS Andrey Marinov CMS TIG meeting and Antonio Conde Garcia

11. Dummies production 3,2mm here 4mm here 6mm fake detector Aluminium frame bar Barthel Phillips (Aachen) mechanical meeting Patch Pannel

12. Dummies Plan Barthel Phillips (Aachen) mechanical meeting

13. THANK YOU