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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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