The Parallel Plate Chamber CERN Presentation Wout Kremers

The Parallel Plate Chamber CERN Presentation Wout Kremers 31/10/2021 1 Detector R&D NIKHEF

Introduction Electron Emmission Foil Parallel Plate Chamber Preliminary Results • • • Electron Emmission Foil Parallel Plate Chamber (PPC) Preliminary Results Simulation Conclusion 31/10/2021 2

Electron Emmission Foil Introduction Electron Emmission Foil Parallel Plate Chamber Preliminary Results • • • 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 MIP Simulation Conclusion 31/10/2021 electron Foil 3

Parallel Plate Chamber Introduction Electron Emmission Foil Parallel Plate Chamber Preliminary Results Copper coated Kapton Foil Cathode Mylar Foil Spacer 68 micron 50 micron Simulation Conclusion 31/10/2021 Messing Block Anode 4

Parallel Plate Chamber Introduction Electron Emmission Foil Parallel Plate Chamber Preliminary Results Simulation Conclusion 31/10/2021 • 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 5

Parallel Plate Chamber Introduction Electron Emmission Foil Parallel Plate Chamber Preliminary Results Simulation Conclusion 31/10/2021 6

Preliminary Results Introduction Electron Emmission Foil Parallel Plate Chamber Preliminary Results Simulation • The pcb was connected to a high voltage supply, a 10 d. B 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 Conclusion 31/10/2021 7

Preliminary Results Introduction Electron Emmission Foil Parallel Plate Chamber Preliminary Results Simulation Conclusion 31/10/2021 8

Preliminary Results Introduction Electron Emmission Foil Parallel Plate Chamber Preliminary Results Simulation Conclusion 31/10/2021 9

Preliminary Results Introduction Electron Emmission Foil Parallel Plate Chamber Preliminary Results Simulation Conclusion 31/10/2021 10

Preliminary Results Introduction Electron Emmission Foil Parallel Plate Chamber 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 Simulation Conclusion 31/10/2021 11

Preliminary Results Introduction Electron Emmission Foil Parallel Plate Chamber Preliminary Results Simulation Conclusion 31/10/2021 12

Simulation Introduction Electron Emmission Foil Parallel Plate Chamber Preliminary Results • • So far only for Fe 55 Assumption all electrons created in gas gap Simple statistical approximation of interactions Monte Carlo simulation Simulation Conclusion 31/10/2021 13

Simulation Introduction Electron Emmission Foil Parallel Plate Chamber Preliminary Results Simulation Conclusion 31/10/2021 14

Conclusion Introduction Electron Emmission Foil Parallel Plate Chamber Preliminary Results Simulation Conclusion 31/10/2021 • 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 15

Conclusion Introduction Electron Emmission Foil Parallel Plate Chamber Preliminary Results Simulation Conclusion electron emission foil • Future possibilities: • Electron emission foil CMOS pixel chip and micro channel amplification • Electron emission foil electron emission foil and multi grid amplification CMOS pixel chip 31/10/2021 16

Introduction Electron Emmission Foil Parallel Plate Chamber Preliminary Results Simulation Conclusion 31/10/2021 ? 17