ABSTRACT

Wall-and-end effects. Tracks of protons generated close to the wall or close to the ends of the detector have a high probability for incomplete energy deposition and collection of ionization. Proton-recoil tracks close to the wall are truncated by collisions with the wall material before the struck proton deposits all its energy in the detector. Protons being produced close to the end of the detector and moving toward either end enter into a region of lower electric eld where there is little or no gas multiplication and where there is, consequently, incomplete collection of the charge produced.