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arXiv · 2501.08554

In-situ high voltage generation with Cockcroft-Walton multiplier for xenon gas time projection chamber

Shinichi Akiyama·Junya Hikida·Masashi Yoshida·Kazuhiro Nakamura·Sei Ban·Masanori Hirose·Atsuko K. Ichikawa·Yoshihisa Iwashita·Tatsuya Kikawa·Yasuhiro Nakajima·Kiseki D. Nakamura·Tsuyoshi Nakaya·Shuhei Obara·Ken Sakashita·Hiroyuki Sekiya·Bungo Sugashima·Soki Urano·Sota Hatsumi·Sota Kobayashi·Hayato Sasaki
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Abstract

We have newly developed a Cockcroft-Walton (CW) multiplier that can be used in a gas time projection chamber (TPC). A TPC requires a high voltage to form an electric field that drifts ionization electrons. Supplying the high voltage from outside the pressure vessel requires a dedicated high-voltage feedthrough. An alternative approach is to generate the high voltage inside the pressure vessel with a relatively low voltage introduced from outside. A CW multiplier can convert a low AC voltage input to a high DC voltage output, making it suitable for this purpose. We have integrated a CW multiplier into the AXEL (A Xenon ElectroLuminescence detector), a high pressure xenon gas TPC to search for neutrinoless double beta decay of $^{136}$Xe. It uses silicon photomultipliers to detect the ionization electrons through elecrtoluminescence, making it strong against electronic noise. Operation of the CW multiplier was successfully demonstrated; the TPC was operated for 40 days at 6.8 bar, and an energy resolution as high as (0.67 $\pm$ 0.08) % (FWHM) at 2615 keV was obtained.

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Shinichi Akiyama, Junya Hikida, Masashi Yoshida, Kazuhiro Nakamura, Sei Ban, Masanori Hirose, Atsuko K. Ichikawa, Yoshihisa Iwashita, Tatsuya Kikawa, Yasuhiro Nakajima, Kiseki D. Nakamura, Tsuyoshi Nakaya, Shuhei Obara, Ken Sakashita, Hiroyuki Sekiya, Bungo Sugashima, Soki Urano, Sota Hatsumi, Sota Kobayashi, Hayato Sasaki. 2025-01-15. In-situ high voltage generation with Cockcroft-Walton multiplier for xenon gas time projection chamber. https://doi.org/10.1093/ptep/ptaf066

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