Электронный каталог

Статья

Nishiguchi, H.
Brand-New Extremely Light Straw-Tube Detector with a Nonwoven Graphite-Textile / H.Nishiguchi, A.Paulau, [a.o.]. – Text : electronic // Nuclear Instruments & Methods in Physics Research A. – 2026. – Vol. 1081. – P. 170854. – URL: https://doi.org/10.1016/j.nima.2025.170854. – Bibliogr.: 8.

The COMET experiment at J-PARC aims to search for a lepton-flavour violating process of muon to electron conversion, with a branching-ratio sensitivity of 10&sup(-17) . The expected signal of this process is monochromatic 105 MeV single electron. To distinguish such a low energy signal, a material budget of detector is essential since the detection accuracy is primarily limited by multiple scattering. To realise the required LOW material budget, a vacuum-compatible ultra-thin-wall straw tracker, 20 *mm-thick Mylar straw with 70 nm Al cathode, has been developed employing ultrasonic-welding technique. This was reported in VCI2016, and the detector performances such as detection efficiency and intrinsic spacial resolutions were reported in VCI2019. In parallel to 20 µ*mm straw production, further thinner straw, ie. 12 *mm-thick, was developed for the COMET upgrade (COMET Phase-II). Details of R&D on 12 *mm straw were reported in VCI2022. In the process of developing the 12 *mm straw, it became clear that it would be fundamentally difficult to make it any thinner using the current straw manufacturing method based on ultrasonic welding. Our R&D showed that the limit is around 10–12 *mm. Then, the brand-new extremely light straw was developed with a nonwoven graphite-textile. This was enabled by a collaboration with the nano-tech textile science. In this article, detailed R&D of the brand-new nonwoven graphite straw will be presented, in addition to the current status of straw-tube tracker construction for the COMET experiment



Спец.(статьи,препринты) = С 344.1н - Новые детекторы
ОИЯИ = ОИЯИ (JINR)2026