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TPG background simulation

Video conference 11/9 -03 Rikard Sandström Geneva University/CERN. TPG background simulation. Production cut at 1 keV Tracking cut at 20 eV 4T magnetic field No electric field Looking in Active Gas Volume for initial kinetic energy, initial position, range, range in z-coordinate.

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TPG background simulation

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  1. Video conference 11/9 -03 Rikard Sandström Geneva University/CERN TPG background simulation

  2. Production cut at 1 keV • Tracking cut at 20 eV • 4T magnetic field • No electric field • Looking in Active Gas Volume for initial kinetic energy, initial position, range, range in z-coordinate. • Active Gas Volume • TPG Gas Volume • Kapton field cage • HV plane, kapton&Cu • Separating plane, kapton • LiqH absorber 35 cm • 2 absorber windows, Al, yyy microns Setup 682 mm 1682 mm 10 MeV e- z

  3. Each 10 MeV e- gives 0.035 photon bremsstrahlung spectrum Most photons from entrance face Some photons from sides

  4. Most photons go through TPG volume end to end.

  5. e-from photo-electric and compton

  6. These are just one time slot These are annoying: they go through the whole chamber

  7. Rescaling to the proposal … gives the following rates and numbers … proposal says 3 109 Hz of dark curent electrons. Assuming they are all 10 MeV (which is pessimistic?) they would give in the open gate of the TPG (50 microseconds) 150 000 e- and this would give 1-2 additional hit per time slot (OKOK) 10-20 electrons going through the whole volume. (much more annoying!) HOWEVER: these vagabonds are related to the high energy tail of the spectrum…. They have energies of 1-5 MeV and could constitute a problem for the sci-fi as well. More investigations on those vagabonds is necessary.

  8. Future plans • Try different gas mixtures • Look at different electron energies • what is the real electron spectrum?

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