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

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 min 3 h Ciba min 10 h Ciba min 2 h 1 frame glued with frames glued with x 24 GEM FRAMES

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

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

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

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

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

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

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

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

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

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

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

F. Murtas LNF/INFN 9 July tutte linguette di connessione da 6 mm di larghezza bus di alta tensione e’ da 4 mm di larghezza schema cornice 20 8

F. Murtas LNF/INFN 9 July 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

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

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