Abstract
The performance of a Thick-COBRA (THCOBRA) gaseous detector is studied using an optical readout technique. The operation principle of this device is described, highlighting its operation in a gas mixture of Ar/CF4 (80/20 %) for visible scintillation light emission. The contributions to the total gain from the holes and the anode strips as a function of the applied bias voltage were visualized. The preservation of spatial information from the initial ionizations was demonstrated by analyzing the light emission from 5.9 keV X-rays of an 55Fe source. The observed non-uniformity of the scintillation light from the holes supports the claim of a space localization accuracy better than the pitch of the holes. The acquired images were used to identify weak points and sources of instabilities in view of the development of new optimized structures.
Highlights
: The performance of a Thick-COBRA (THCOBRA) gaseous detector is studied using an optical readout technique
The detector used in this study consists of a double GEM stack on top of the THCOBRA foil, which is used as a pre-amplification stage to achieve higher gas gain
A camera was placed outside of the gas volume facing the bottom of the THCOBRA foil through a glass plate coated with 25 nm thick Indium-Tin Oxide (ITO)
Summary
In the figure 1, a picture of the THCOBRA foil with its electrodes’ pattern on the bottom and top sides [16] is shown. The principle of operation of the THCOBRA foil is based on two amplification stages (figure 2) [17]. This hybrid gaseous electron multiplier works as a THGEM inside the holes and as a MSGC-like structure between cathode and anode strips. A voltage difference between the top contact and the cathode is applied to create a high electric field inside the holes as is the case for THGEMs. In addition, between the
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