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

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Presentation transcript:

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

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 mm1682 mm z 10 MeV e-

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

Most photons go through TPG volume end to end.

e-from photo-electric and compton

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

Rescaling to the proposal … gives the following rates and numbers … proposal says 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) e- and this would give 1-2 additional hit per time slot (OKOK) 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.

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