1. F. Murtas LNF/INFN 9 July 2002 GEM Chamber 20x24 cm 2 Status Report F.Murtas for the GEM group  20x24 Prototype  PSI Test Beam  Module 0 Progress  Material budget  Conclusions

2. F. Murtas LNF/INFN 9 July 2002 The frame with glue is placed on top of the streched gem foil and pressed. After 2 hours the frame is ready. We have preformed several trials with Araldite glues : Type working time 50% hardness Ciba 2010 15 min 3 h Ciba 2011120 min 10 h Ciba 2012 5 min 2 h 1 frame glued with 2011 2 frames glued with 2012 20 x 24 GEM FRAMES

3. F. Murtas LNF/INFN 9 July 2002.. and finally the cathode The three Gem frames are placed on top of the others without spacers... PROTOTIPE ASSEMBLING

4. F. Murtas LNF/INFN 9 July 2002 PROTO @ PSI TEST BEAM 2 chambers 20x24 with different geometry:  3-1-2-1 mm  2-2-2-1 mm Total current of 27  A on pads with divider with 7 independent hv channel 27  A 14  A detailed analysis next meeting

5. F. Murtas LNF/INFN 9 July 2002 MODULE 0 : NEW GEM FOIL 200 mm 240 mm 34 mm G10 Frame Holes for SMD decupling resistor

6. F. Murtas LNF/INFN 9 July 2002 MODULE 0 : FRAME DESIGN G10 frames of 1-2-3 mm of thickness Holes for SMD decupling resistors Frame profile Glue Ciba 2012 Glue “Rail” Kapton foil 5mm Glue for the next frame

7. F. Murtas LNF/INFN 9 July 2002 ~ 1 Kg/cm Kapton foil Frame prototype BREAKING LOAD ~ 8 Kg/cm !

8. F. Murtas LNF/INFN 9 July 2002 GEM FRAMES PILEUP 200 mm 240 mm HV

9. F. Murtas LNF/INFN 9 July 2002 MODULE 0 : PCB PAD Gas inlet holes 7 ASDQ cards connector 5 ASDQ cards connector Next week test with foam

10. F. Murtas LNF/INFN 9 July 2002 34 4 10 36 22 200 x 240 mm 45 MODULE 0 : PCB CATHOD ready in 3 weeks HV connector for divider GEM frame Cathod

11. F. Murtas LNF/INFN 9 July 2002 Honeycomb or foam gas inletgas outlet A B HV FEE DOUBLE CHAMBER LAYOUT G3 G2 G1 F gas fitting HV top view side view hv divider

12. F. Murtas LNF/INFN 9 July 2002 MATERIAL BUDGET Material budget for one GEM chamber 2 MWPC Pannels with: - 1 PCB Pad......... G10 1.6 mm of thikness and 35  m Cu - 1 PCB Cathod...... G10 1.6 mm of thikness and 35  m Cu - 1 Ground/shielding.. G10 1.6 mm of thikness and 35  m Cu 3 Frames of 22 mm wide (36 mm for only one side) 1-3 mm thick 3 Gem Foils....... 50  m Kapton and 5+5  m Cu Total 5-6% X 0 2-3% 1% X 0 0.2 % X 0 7-8 % X 0 0.5% 4 % Double Gem Chamber about 16% 8 % X 0 (only detector )

13. F. Murtas LNF/INFN 9 July 2002 CONCLUSIONS  The 20x24 cm 2 prototype has been tested at PSI some hv instabilities with independent hv chnnels with divider (final solution) seems much better Final results on next meeting  Module 0 design and tools construction is going on  Material budget : X 0 foreseen ~ 16% 8% (only detector)  Module 0 ready for the end of Semptember

14. F. Murtas LNF/INFN 9 July 2002 240 246 3 7 204 210 3622 8 6 31 26 15 6 tutte linguette di connessione da 6 mm di larghezza bus di alta tensione e’ da 4 mm di larghezza 20 34 4 schema cornice 20 8

15. F. Murtas LNF/INFN 9 July 2002 240 246 3 7 204 210 31 26 15 6 20 34 4 20 8 36 Il foglio di kapton su cui e’ disegnato circuito deve avere dimensioni 340 x 340 mm. Il circuito che ha dimensioni 210 x 304 deve essere centrato com in figura 340 65

16. F. Murtas LNF/INFN 9 July 2002 Double Chamber layout Honeycomb gas inletgas outlet G3 G2 G1 F gas in/outlet gas fitting A B HV resistors FEE

17. F. Murtas LNF/INFN 9 July 2002 GEM FOIL LAYOUT 20 cm 24 cm