Abstract
The possibility of measuring the energy of electrons and photons with a simple detector consisting of a lead convertor and ionization tubes filled with pure argon has been studied. The measurements have been performed in a 26.6 GeV electron beam. The best energy resolution σ/E ∼ 16% was achieved for a convector thickness of 40 mm and an argon pressure ⪆20 atm.The performance of the detector in magnetic fields up to 16 kG has also been studied. It turned out that the mean pulse height rises approximately linearly with increasing magnetic field and becomes flat at H ∼ 10 kG. This behavior is the same for magnetic fields perpendicular and parallel with respect to the ionization tubes. The energy resolution depends weakly on the magnetic field.Ionization tubes filled with argon or xenon under high pressure may be used for minimum ionizing particle detection.
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