Investigation of a hybrid structure gaseous detector for ion backflow suppression suppression
2016
A new concept for ion backflow suppression in future time projection chamber with Micropattern Gas Detectors readout is presented.
It is a hybrid structure cascaded Gas Electron Multiplier with Micromegas with the goal to reduce ion backflow from the amplification region towards the drift volume.
Gas Electron Multiplier also acting as a preamplifer and shares gas gain with Micromegas.
In this way a lower voltage difference has to be applied to the Micromegas and risk of sparking is reduced.
Feasibility tests for the hybrid detector is performed using an $^{55}$Fe X-ray source to evaluate the energy resolution, its gain properties and the ion backflow.
%The properties of this novel structure in terms of gain and ion backflow are investigated.
The energy resolution is better than 27$\%$ FWHM for 5.9 keV X-rays.
It is demonstrated that at a gain up to 6000, a backflow ratio less than 0.3$\%$ is reachable in the hybrid readout structure.
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