Construction and commissioning of the SuperNEMO detector tracker

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• 作者：Michele Cascella ^{m.cascella@ucl.ac.uk" class="auth_mail" title="E-mail the corresponding author} ; On behalf of the SuperNEMO collaboration
• 关键词：Tracking detectors ; Wire chambers ; Neutrinoless double beta decay
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：11 July 2016
• 年：2016
• 卷：824
• 期：Complete
• 页码：507-509
• 全文大小：919 K

文摘

The SuperNEMO detector will search for neutrinoless double beta decay at the Modane Underground Laboratory; the detector design allows complete topological reconstruction of the decay event enabling excellent levels of background rejection and, in the event of a discovery, the ability to determine the nature of the lepton number violating process.

In order to demonstrate the feasibility of the full experiment, we are building a Demonstrator Module containing 7 kg of ⁸²Se, with an expected sensitivity of $\left|m_{\beta \beta }\right|<0.2-0.4\mathrm{eV}$ after 2.5 yr.

The demonstrator tracker is currently being assembled in the UK; the main challenge in the tracker design is the high radiopurity required to limit the background. For this reason the cell wiring is automated and every step of the tracker assembly happens in a clean environment. All components are carefully screened for radiopurity and each section of the tracker, once assembled, is sealed and checked for Radon emanation.

We present the detector design, the current status of the construction and present the first results from the surface commissioning of one section of the Demonstrator Module tracker.