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Copper electroplating for background suppression in the NEWS-G experiment

التفاصيل البيبلوغرافية
العنوان: Copper electroplating for background suppression in the NEWS-G experiment
المؤلفون: Collaboration, NEWS-G, Balogh, L., Beaufort, C., Brossard, A., Bunker, R., Caron, J. -F., Chapellier, M., Coquillat, J. -M., Corcoran, E. C., Crawford, S., Fard, A. Dastgheibi, Deng, Y., Dering, K., Durnford, D., Gerbier, G., Giomataris, I., Giroux, G., Gorel, P., Gros, M., Gros, P., Guillaudin, O., Hoppe, E. W., Katsioulas, I., Kelly, F., Knights, P., Kwon, L., Langrock, S., Lautridou, P., Martin, R. D., Mols, J. -P., Muraz, J. -F., Navick, X. -F., Neep, T., Nikolopoulos, K., O'Brien, P., Owen, R., Piro, M. -C., Santos, D., Savvidis, G., Savvidis, I., Fernandez, F. Vazquez de Sola, Vidal, M., Ward, R., Zampaolo, M., Anguiano, S. Alcantar, Arnquist, I. J., di Vacri, M. L., Harouaka, K., Kobayashi, K., Thommasson, K. S.
المصدر: Nucl.Instrum.Meth.A 988 (2021) 164844
سنة النشر: 2020
المجموعة: Astrophysics
High Energy Physics - Experiment
Physics (Other)
مصطلحات موضوعية: Physics - Instrumentation and Detectors, Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment
الوصف: New Experiments with Spheres-Gas (NEWS-G) is a dark matter direct detection experiment that will operate at SNOLAB (Canada). Similar to other rare-event searches, the materials used in the detector construction are subject to stringent radiopurity requirements. The detector features a 140-cm diameter proportional counter comprising two hemispheres made from commercially sourced 99.99% pure copper. Such copper is widely used in rare-event searches because it is readily available, there are no long-lived Cu radioisotopes, and levels of non-Cu radiocontaminants are generally low. However, measurements performed with a dedicated 210Po alpha counting method using an XIA detector confirmed a problematic concentration of 210Pb in bulk of the copper. To shield the proportional counter's active volume, a low-background electroforming method was adapted to the hemispherical shape to grow a 500-$\mu$m thick layer of ultra-radiopure copper to the detector's inner surface. In this paper the process is described, which was prototyped at Pacific Northwest National Laboratory (PNNL), USA, and then conducted at full scale in the Laboratoire Souterrain de Modane in France. The radiopurity of the electroplated copper was assessed through Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Measurements of samples from the first (second) hemisphere give 68% confidence upper limits of <0.58 $\mu$Bq/kg (<0.24 $\mu$Bq/kg) and <0.26 $\mu$Bq/kg (<0.11 $\mu$Bq/kg) on the 232Th and 238U contamination levels, respectively. These results are comparable to previously reported measurements of electroformed copper produced for other rare-event searches, which were also found to have low concentration of 210Pb consistent with the background goals of the NEWS-G experiment.
Comment: 11 pages, 11 figures, 3 tables
نوع الوثيقة: Working Paper
URL الوصول: http://arxiv.org/abs/2008.03153
رقم الانضمام: edsarx.2008.03153
قاعدة البيانات: arXiv
ResultId 1
Header edsarx
arXiv
edsarx.2008.03153
1008
3
Report
report
1007.71026611328
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&scope=site&db=edsarx&AN=edsarx.2008.03153&custid=s6537998&authtype=sso
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