1. December 10, 2008 1 The Parallel Plate Chamber CERN Presentation Wout Kremers Detector R&D NIKHEF

2. Introduction Electron Emmission Foil Parallel Plate Chamber Simulation Conclusion Preliminary Results December 10, 20082 Introduction Electron Emmission Foil Parallel Plate Chamber (PPC)‏ Preliminary Results Simulation Conclusion

3. Introduction Electron Emmission Foil Parallel Plate Chamber Simulation Conclusion Preliminary Results December 10, 20083 Electron Emmission Foil Incident MIP hits foil Thin foil (atm 68 micron)‏ MIP frees electrons in foil Few electrons will be close to surface of foil These can be amplified Foil MIP electron

4. Introduction Electron Emmission Foil Parallel Plate Chamber Simulation Conclusion Preliminary Results December 10, 20084 Parallel Plate Chamber Copper coated Kapton Foil Cathode Messing Block Anode Mylar Foil Spacer 50 micron 68 micron

5. Introduction Electron Emmission Foil Parallel Plate Chamber Simulation Conclusion Preliminary Results December 10, 20085 Parallel Plate Chamber Gas amplification potential causes electrostatic force Spacer to keep distance and define active area detector Foil cathode placed under tension to limit bending effect To stabilise gas flow and pressure a perspex clamp was mounted on the pcb

6. Introduction Electron Emmission Foil Parallel Plate Chamber Simulation Conclusion Preliminary Results December 10, 20086 Parallel Plate Chamber

7. Introduction Electron Emmission Foil Parallel Plate Chamber Simulation Conclusion Preliminary Results December 10, 20087 Preliminary Results The pcb was connected to a high voltage supply, a 10dB output amplifier and a scope The chamber was flushed with 97,5% Argon and 2,5% Iso-butane Chamber was tested with Fe 55 and Sr 90 sources

8. Introduction Electron Emmission Foil Parallel Plate Chamber Simulation Conclusion Preliminary Results December 10, 20088 Preliminary Results

9. Introduction Electron Emmission Foil Parallel Plate Chamber Simulation Conclusion Preliminary Results December 10, 20089 Preliminary Results

10. Introduction Electron Emmission Foil Parallel Plate Chamber Simulation Conclusion Preliminary Results December 10, 200810 Preliminary Results

11. Introduction Electron Emmission Foil Parallel Plate Chamber Simulation Conclusion Preliminary Results December 10, 200811 Preliminary Results Some signals were below noise level No gain could be directly seen from spectrum Measurement made of signal current Current on the order of pico ampere

12. Introduction Electron Emmission Foil Parallel Plate Chamber Simulation Conclusion Preliminary Results December 10, 200812 Preliminary Results

13. Introduction Electron Emmission Foil Parallel Plate Chamber Simulation Conclusion Preliminary Results December 10, 200813 Simulation So far only for Fe 55 Assumption all electrons created in gas gap Simple statistical approximation of interactions Monte Carlo simulation

14. Introduction Electron Emmission Foil Parallel Plate Chamber Simulation Conclusion Preliminary Results December 10, 200814 Simulation

15. Introduction Electron Emmission Foil Parallel Plate Chamber Simulation Conclusion Preliminary Results December 10, 200815 Conclusion Working chamber with small avalanche only gap Chamber which can be used to test foils Different types of foils, eg carbon nanotube coated foil Foil efficiency will be determined through beam test

16. Introduction Electron Emmission Foil Parallel Plate Chamber Simulation Conclusion Preliminary Results December 10, 200816 Conclusion Future possibilities: Electron emission foil and micro channel amplification Electron emission foil and multi grid amplification electron emission foil CMOS pixel chip electron emission foil CMOS pixel chip

17. Introduction Electron Emmission Foil Parallel Plate Chamber Simulation Conclusion Preliminary Results December 10, 200817 ?