Dual-anode high-pressure xenon cylindrical ionization chamber

A new approach to the design of high-pressure xenon cylindrical ionization chambers is investigated. In the new approach, a dual anode is used to replace the single anode surrounded by a shielding grid, which are employed in a conventional design. Two anode wires are stretched near the axis of the 30 cm long cylindrical chamber with a 9 cm diameter cathode. Both the wires are kept at the same (nearly zero) potential and are dc-coupled to the charge-sensitive preamplifiers. For most cases, only one of the wires (it can be either one) collects the electrons produced by an ionizing event. The difference between the signals read out from the wires is proportional to the total produced charge. The experimental results are compared to Monte Carlo simulations. The optimal design of the dual-anode cylindrical ionization chamber is discussed.