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The AEGIS low temperature system.

Number: pap. n. 073

Author(s) : EISEL T., BREMER J., BURGHART G., et al.

Summary

The antimatter experiment AEGIS is being constructed at CERN. Its scientific goal is to measure the gravitational interaction between antimatter and ordinary matter. Therefore neutral antihydrogen is subjected to the earth’s gravitational field. In order to perform precise measurements, the antihydrogen needs to be produced at very low temperatures. This is achieved by cooling the combining antiprotons to temperatures of about 100 mK. The antiprotons are trapped and cooled in a Penning trap. The required electrical fields are generated by a series of electrodes, which are charged independently with peak voltages of up to 1 kV. The electrodes are formed by thin gold layers sputtered onto polished sapphire. Sapphire provides reliable electrical insulation and very high thermal conductivity. The bottom of the sapphire is gold sputtered too and is pressed against the mixing chamber of a dilution refrigerator. An indium foil sandwiched between the sapphire and the mixing chamber is used to reduce the thermal boundary resistance.

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Pages: 102-105

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Details

  • Original title: The AEGIS low temperature system.
  • Record ID : 30005803
  • Languages: English
  • Source: Cryogenics 2012. Proceedings of the 12th IIR International Conference: Dresden, Germany, September 11-14, 2012.
  • Publication date: 2012/09/11

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