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Dilution Refrigerator for Hydro-Møller Polarimeter @ MESA P2 Experiment

  • PHYSICS OF ELEMENTARY PARTICLES AND ATOMIC NUCLEI. EXPERIMENT
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Abstract

The new Mainz Energy-Recovering Superconducting Accelerator (MESA) is under construction. It is planned to carry out at the accelerator a P2 experiment which aims for a high precision determination of the weak mixing angle sin2θW to a precision of 0.15% at a four-momentum transfer of 4.5 × 10−3 GeV2. The planned time for collecting statistics is 11000 h using a 150 μA polarized electron beam impinging on a 60 cm liquid hydrogen target. For continuous online measurement of polarization, a Hydro-Møller Polarimeter is provided in the design of the P2 experiment. One of the main parts of this polarimeter is 3He/4He dilution refrigerator (DR), which allows to maintain an ultra-low temperature (<250 mK) in a continuous mode. In this article a description of the design, construction and recent results of the horizontal dilution refrigerator for Hydro-Møller Polarimeter @ MESA P2 experiment are given.

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Funding

The research was carried out at the expense of the grant of the Russian Science Foundation no. 21-79-00007, https://rscf.ru/en/project/21-79-00007/.

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Authors and Affiliations

  1. Low Temperature Department, Dzhelepov Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 141980, Dubna, Moscow oblast, Russia

    I. Gorodnov & A. Dolzhikov

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  1. I. Gorodnov
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  2. A. Dolzhikov
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Correspondence to I. Gorodnov.

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Gorodnov, I., Dolzhikov, A. Dilution Refrigerator for Hydro-Møller Polarimeter @ MESA P2 Experiment. Phys. Part. Nuclei Lett. 20, 1183–1186 (2023). https://doi.org/10.1134/S1547477123050308

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  • DOI: https://doi.org/10.1134/S1547477123050308

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