High-precision gas gain and energy transfer measurements in Ar–CO 2 mixtures

Şahin, Özkan; Kowalski, T. Z.; Veenhof, R.

doi:10.1016/j.nima.2014.09.061

Cited by 34 publications

(41 citation statements)

References 16 publications

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“…Calculations in Ne/5%CH 4 , Ar/5%CH 4 and Ar/30%CO 2 were performed with and without the inclusion of Penning transfers. Every time the Penning transfers were considered, its rates were set to r = 0.4, r = 0.18 [8] and r = 0.57 [7] respectively to the above listed mixtures.…”

Section: Methodsmentioning

confidence: 99%

“…The Penning effect occurs in gas mixtures when the energy of an excited atom is higher than the ionization potential of the admixture gas (quencher). If a collision between them occurs, energy transfers are possible resulting in an extra electron [7]. Recently, very detailed and exhaustive studies have been carried out in Penning transfer namely in argon and neon mixtures [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

THGEM gain calculations using Garfield++: solving discrepancies between simulation and experimental data

Azevedo¹,

Correia²,

Carramate³

et al. 2016

J. Inst.

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Abstract:Discrepancies between the measured and simulated gain in Thick Micropatterned gaseous detectors (MPGD), namely THGEM, have been observed by several groups. In order to simulate the electron avalanches and the gain the community relies on the calculations performed in Garfield++, known to produce differences of 2 orders of magnitude in comparison to the experimental data for thick MPGDs.In this work, simulations performed for Ne/5%CH 4 , Ar/5%CH 4 and Ar/30%CO 2 mixtures shows that Garfield++ is able to perfectly describe the experimental data if Penning effect is included in the simulation. The comparison between the number of excitations which may lead to a Penning transfer, is shown for THGEM and GEM, explaining the less pronounced gain discrepancies observed in GEM.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

THGEM gain calculations using Garfield++: solving discrepancies between simulation and experimental data

Azevedo¹,

Correia²,

Carramate³

et al. 2016

J. Inst.

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show abstract

“…[16]). We have used the gas mixture with Argon (70%) and CO 2 (30%) for our studies [17] presented throughout in this paper.…”

Section: Description Of Triple Gem Detectormentioning

confidence: 99%

Performance of the triple GEM detector built using commercially manufactured GEM foils in India

Gola

Malhotra

Shah

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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The Gas Electron Multiplier (GEM) detectors has been utilized for various applications due to their excellent spatial resolution, high rate capabilities and flexibility in design. The GEM detectors stand as a promising device to be used in nuclear and particle physics experiments. Many future experiments and upgrades are looking forward to use this technology leading to high demand of GEM foils. Until now, CERN is the only reliable manufacturer and distributor of GEM foils, but with technology transfer, few other industries across the globe have started manufacturing these foils employing the same photo-lithographic technique. The Micropack Pvt. Ltd. is one such industry in India which produced first few 10 cm × 10 cm GEM foils, which were then distributed to few collaborating partners for testing reliability and performance of foils before they can be accepted by the scientific community. Characterization of three such foils have already been performed by studying their optical and electrical properties. Using these foils a triple GEM detector has been built and various performance characteristics have been measured. In this paper, we specifically report measurements on gain, resolution and response uniformity, by utilizing local quality control set-ups existing at University of Delhi.

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“…The Penning coefficient, gives the probability of an excited state of the noble gas atom ionizing the auxiliary gas of the mixture. As this probability is related to the gas transparency for UV photons, it changes according to the pressure, temperature and concentration in the gas mixture [55]. For 1 bar of Ar/CO 2 (90/10), the Penning coefficient was kept at 0.47 [54].…”

Section: Penning Effectmentioning

confidence: 99%

“…An 55 Fe radioactive source was used for these measurements. The energy resolution was calculated by fitting different Gaussian curves for the 55 Fe K α peaks. The radioactive source was collimated with a 3 mm thick tantalum plate, with a hole with a diameter of 2 mm.…”

Section: Energy Resolutionmentioning

confidence: 99%

X-Ray fluorescence imaging system based on Thick-GEM detectors

Souza¹

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AgradecimentosEste trabalho recebeu apoio financeiro da Fundação de Amparo à Pesquisa do Estado de São Paulo, com a bolsa FAPESP 2017/00426-9.My sincere thanks to the whole GDD lab at CERN, in special Leszek Ropelewski, Eraldo Oliveri, Patrik Thuiner and Florian Brunbauer.Gostaria de agradecer primeiramente ao professor Alexandre Suaide, por me introduzir ao grupo e pela ajuda nos mais diversos assuntos. À professora Marcia Rizzuto e à minha amiga Hellen Santos, pelo interesse nesse trabalho e troca de informações.Aos professores Marco Bregant, Marcelo Munhoz, Nelson Carlin, Tiago Fiorini, Mauro Cosentino e Zwinglio Guimarães pelas ideias e sugestões, tornando esse trabalho muito mais completo.Ao meu orientador e amigo, Hugo Natal da Luz, pelos ensinamentos, conselhos e paciência. Aos amigos que fiz durante a graduação e o mestrado, pela diversão, aprendizado e companhia durante todos esse anos. Um agradecimento especial aos amigos do grupo, Henrique, Milton, Camila, Chiara, Thais e Lucas. À minha familia, meus pais, Marco Aurélio e Maria Cabrine, e meu irmão Ramon, por toda confiança e suporte. Vocês são os melhores exemplos para mim. À Mayumi, pelo carinho e por estar ao meu lado nos melhores e piores momentos."All we have to decide is what to do with the time that is given us." -J.R.R. Tolkien, The Lord of The Rings Abstract GEMs (Gas Electron Multiplier) and Thick-GEMs (Thick-Gas Electron Multiplier) are MPGDs (Micropattern Gas Detector) that make part of the new generation of gaseous detectors, allowing high counting rates, low cost when compared to solid state detectors, high radiation hardness and gain when using multiple structures. Besides that, the handling and maintenance of these detectors is relatively simple, being versatile to detect different types of radiation. Therefore, these detectors are an effective alternative to build imaging systems with large sensitive area. This work consists in the study and characterization of a set of gaseous detectors, more specifically the Thick-GEMs produced in the High Energy Physics and Instrumentation Center at IFUSP, which were tested showing promising results in terms of gain, energy resolution and operational stability. However, due to the low signal-to-noise ratio of the Thick-GEMs, the X-ray fluorescence imaging system was mounted using GEMs. During this work the necessary software tools for image processing and reconstruction were developed as a parallel study in computational simulations to better understand the operation of gaseous detectors.X-ray fluorescence techniques are essential in areas such as medicine and the study of historical and cultural heritage since they are non-invasive and non-destructive. Techniques to check the authenticity of masterpieces are required and museums are gradually becoming more interested in the Physics and instrumentation needed to characterize their patrimony.

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High-precision gas gain and energy transfer measurements in Ar–CO 2 mixtures

Cited by 34 publications

References 16 publications

THGEM gain calculations using Garfield++: solving discrepancies between simulation and experimental data

THGEM gain calculations using Garfield++: solving discrepancies between simulation and experimental data

Performance of the triple GEM detector built using commercially manufactured GEM foils in India

X-Ray fluorescence imaging system based on Thick-GEM detectors

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