Abstract
The spherical proportional counter is a gaseous detector used in a variety of applications, including direct dark matter and neutrino-less double beta decay searches. The ACHINOS multi-anode structure is a read-out technology that overcomes the limitations of single-anode read-out structures for large-size detectors and operation under high pressure. A resistive ACHINOS is presented, where the 3D printed central component is coated in a Diamond-Like Carbon (DLC) layer. The production and testing of the structure, in terms of stability and resolution, is described.
Highlights
The ACHINOS structure with 11-anodes, each 1 mm in diameter, shown in figure 3(b) was installed in a 30 cm diameter spherical proportional counter that operated in sealed mode
The same procedure was repeated for the other measurements, with the results shown in figure 7(a) for the amplitude and figure 7(b) for the local energy resolution, which varies between 7.1% and 9.2%
It was found that the Diamond-Like Carbon (DLC) layer is robust under discharges
Summary
The ACHINOS structure with 11-anodes, each 1 mm in diameter, shown in figure 3(b) was installed in a 30 cm diameter spherical proportional counter that operated in sealed mode. The detector was filled with 500 mbar of Ar : CH4 (98% : 2%) and data were collected at various anode voltages and pressures, and the amplitude of the 5.9 keV peak were recorded. These measurements, performed with the central electrode electrically floating, are presented, where the detector is shown to operate in proportional mode over a wide pressure range. It is demonstrated that large gas gains (avalanche electron multiplication factor) of up to 104 can be achieved with this detector configuration
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