Abstract
We have recently reported the development of a new type of high-pressure Xenon time projection chamber operated with an ultra-low diffusion mixture and that simultaneously displays Penning effect and fluorescence in the near-visible region (300 nm). The concept, dubbed ‘Penning-Fluorescent’ TPC, allows the simultaneous reconstruction of primary charge and scintillation with high topological and calorimetric fidelity.
Highlights
We have recently reported the development of a new type of high-pressure Xenon time projection chamber operated with an ultra-low diffusion mixture and that simultaneously displays Penning effect and fluorescence in the near-visible region (300 nm)
A microscopic modelling of the Micromegas response is in preparation [11]. It must be noted at the outset that the term ‘Penning-Fluorescent’ refers here to wavelength-shifted fluorescence, i.e., to scintillation with a characteristic spectrum centered around the visible range
The energy resolution obtained for 0.511 MeV tracks with Micromegas is at least ×2 better than the one obtained earlier with wire chambers in [17], with Xe-TMA reducing electron diffusion in factors of ≃ 2 in all 3 space dimensions relative to, e.g., Xe-CH4 (Fig. 3) and operation taking place at twice the pressure, increasing event containment
Summary
The possibility of using ‘Penning-Fluorescent’ gas mixtures was addressed as early as at least. A microscopic modelling of the Micromegas response is in preparation [11] It must be noted at the outset that the term ‘Penning-Fluorescent’ refers here to wavelength-shifted fluorescence, i.e., to scintillation with a characteristic spectrum centered around the visible range (noble gas VUV-fluorescence must be necessarily quenched by the mixture too). Xe*→TMA+ transfer probability, r (direct) primary TMA scintillation, S1[ph./MeV]
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