Penning effects in Ar-Xe mixtures at atmospheric pressures: absolute W-value measurements for 5.9 keV X-rays

Vinagre, F.L.R.; Conde, C.A.N.

doi:10.1109/nssmic.1999.845753

Cited by 3 publications

(7 citation statements)

References 7 publications

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“…These effects are the subject of current studies. After evacuation followed by gas filling and circulation through getters, 20-fold higher gains were reached with the Penning mixture [29,30] At cryogenic temperatures, the maximum achievable gain in all gases is expected to drop due to the increase in gas density, as recently demonstrated with cascaded GEMs [10,11] and in Resistive Electrode Thick GEMs (RETGEM) [21].…”

Section: Summary and Discussionmentioning

confidence: 87%

Operation of a Thick Gas Electron Multiplier (THGEM) in Ar, Xe and Ar-Xe

Alon¹,

Miyamoto²,

Cortesi³

et al. 2008

J. Inst.

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We present the results of our recent studies of a Thick Gaseous Electron Multiplier (THGEM)-based detector, operated in Ar, Xe and Ar:Xe (95:5) at various gas pressures. Avalanche-multiplication properties and energy resolution were investigated with soft x-rays for different detector configurations and parameters. Gains above 10 4 were reached in a double-THGEM detector, at atmospheric pressure, in all gases, in almost all the tested conditions; in Ar:Xe (95:5) similar gains were reached at pressures up to 2 bar. The energy resolution dependence on the gas, pressure, hole geometry and electric fields was studied in detail, yielding in some configurations values below 20% FWHM with 5.9 keV x-rays.

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Section: Summary and Discussionmentioning

confidence: 87%

Operation of a Thick Gas Electron Multiplier (THGEM) in Ar, Xe and Ar-Xe

Alon¹,

Miyamoto²,

Cortesi³

et al. 2008

J. Inst.

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“…For the present experiments we used collimated 5.895 keV Mn X-rays from a 5 mCi radioactive source with the 6.492 keV Mn line filtered with a 0.01 mm thick Cr foil. Possibly due to recombination, there was a small dependence of the collected charge, , on the voltage difference applied to the drift region, which increased with this voltage until it reached a plateau at about 2000 V [12]. For the measurements of the -values the drift voltages used were the ones in the plateau.…”

Section: Experimental Technique For Measurement Of W-values For Amentioning

confidence: 99%

“…Corrections for losses due to the escape of Ar L-and Xe M-fluorescence X-rays were also made since X-ray spectra were obtained during this second step using a multichannel analyser. These peaks are typically 30 times smaller than the main peak and since the -value does not change with the energy in this few keV range by more than 10% [1], [2] it is reasonable to make these corrections assuming a -value for the escape peaks equal to the full absorption energy peak [12]. Corrections due to pile-up effects, a small broad peak observable between the main peak and twice its amplitude, were also made counting twice the number of events in this region since they correspond to the absorption of two 5.895 keV photons.…”

Section: Experimental Technique For Measurement Of W-values For Amentioning

confidence: 99%

“…The accuracy of the experimental -values is limited by the accuracy of the Keithley 6512 electrometer ( 0.45%) and the dead time corrections ( 0.3%). The estimated overall error is 0.96%, which means an accuracy in the -values of 0.21 eV [12], [16].…”

Section: Experimental Technique For Measurement Of W-values For Amentioning

confidence: 99%

“…A preliminary partial version of this work was presented to the 1999 IEEE NSS [12], following previous experiments [13]- [16].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of the $w$-Values and Fano Factors of Gaseous Xenon and Ar-Xe Mixtures for X-Rays

Carmo

Borges

Vinagre

et al. 2008

IEEE Trans. Nucl. Sci.

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An experimental study of the -values and Fano factors for Ar-Xe gaseous mixtures at atmospheric pressures for 5.895 keV X-rays was carried out with two experimental set-ups based on gas proportional scintillation counter techniques. For the 100% Xe, Ar-40% Xe, Ar-20% Xe and Ar-10% Xe mixtures at 800 Torr the measured -values were 21.61 eV, 21.63 eV, 21.64 eV and 21.42 eV, respectively, within an accuracy of 0.21 eV. For the same mixtures the Fano factors were 0.254, 0.258, 0.250 and 0.256, respectively, within an accuracy of about 0.004. For lower Xe concentrations of 5%, 3% and 1% the Fano factors were 0.24, 0.23 and 0.22, respectively. These experimental results are compared with those available in the literature.

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