arXiv : Observation of strong wavelength-shifting in the argon-tetrafluoromethane system

Amedo, P.; Brunbauer, F.M.; Oliveri, E.; Fernández-Posada, D.J.; González-Díaz, D.; Ropelewski, L.

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Preprint
Report number	arXiv:2306.09919
Title	Observation of strong wavelength-shifting in the argon-tetrafluoromethane system
Author(s)	Amedo, P. (Santiago de Compostela U., IGFAE) ; González-Díaz, D. (Santiago de Compostela U., IGFAE) ; Brunbauer, F.M. (CERN) ; Fernández-Posada, D.J. (Santiago de Compostela U., IGFAE) ; Oliveri, E. (CERN) ; Ropelewski, L. (CERN)
Imprint	2023-06-16
Number of pages	27
Note	Updated to match current journal submission
Subject category	physics.ins-det ; Detectors and Experimental Techniques
Project	CERN-EP-RDET
Abstract	We report the scintillation spectra of Ar-CF$_4$ mixtures in the range 210-800 nm, obtained under X-ray irradiation for various pressures (1-5 bar) and concentrations (0-100%). Special care was taken to eliminate effects related to space charge and recombination, so that results can be extrapolated following conventional wisdom to those expected for minimum ionizing particles under the typical electric fields employed in gaseous instrumentation. Our study sheds light into the microscopic pathways leading to scintillation in this family of mixtures.
Other source	Inspire
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0)

$Exemplary scans in electric field and X-ray intensity. Left: current at the anode of the scintillation cell as a function of the applied electric field up to reaching full-collection, for different currents of the X-ray tube (pure CF$_4$ at 1~bar). Green lines represent identical space charge conditions (i.e., same degree of field distortion by positive ions) according to the parameter $\alpha$ introduced in \cite{Space_charge_Mcdonald} and discussed in section \ref{EF_section} of the appendix. Right: current at full charge-collection (right axis) and associated ionization density (left axis) as a function of the current of the X-ray tube for CF$_4$ at 1 and 4 bar (light and dark blue) and pure argon at 2 and 5 bar (red and orange). Each of them was fitted to a proportional trend. (Given the non-linear map between the current and the ionization density, each data series includes an additional multiplicative factor in order to transform the right-axis value into the correct one)$ $Emission spectra per eV of released energy for pure argon (upper plot) and pure CF$_4$ (lower plot) at 1 and 4 bar (blue, purple), obtained at zero field. No significant dependence with the intensity of the X-ray tube was observed, suggesting that measurements are recombination-free. For pure CF$_4$, where full charge-collection could be reached before the onset of secondary scintillation, no dependence with the electric field was observed either. The spectra of argon's $3^{\textnormal{rd}}$ continuum obtained in \cite{Cachoncille} also with X-rays (red-dashed) and the one of CF$_4$ obtained in \cite{CF4_alphas_Moro} with $\alpha$-particles (orange-dashed) are shown for comparison. A global normalization was imposed by setting to 1 the maximum of the 290 nm peak in pure CF$_4$ at 1 bar.$ Show more plots

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