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Ultrastable superconducting magnet system for a penning trap mass spectrometer.

Author(s) : DYCK R. S. van Jr, FARNHAM D. L., ZAFONTE S. L., et al.

Type of article: Article

Summary

A custom-designed magnet/cryostat system is described which has demonstrated remarkably improved field stability over previous designs. To shield external magnetic noise, a custom-fabricated flux-gate device remotely senses the changes in magnetic field and cancels them out at the site of the magnet/cryostat via a 1.7 m-diam Helmholtz coil. To provide further shielding, the basic superconducting solenoid includes a passive flux-stabilizing coil. To stabilize internal field shifts, the temperature of the materials in the immediate vicinity of the solenoid (which have a temperature-dependent susceptibility) is stabilized via the new cryostat geometry and by controlling the pressure of the evaporating liquid helium to a few parts per million.

Details

  • Original title: Ultrastable superconducting magnet system for a penning trap mass spectrometer.
  • Record ID : 2000-2370
  • Languages: English
  • Source: Rev. sci. Instrum. - vol. 70 - n. 3
  • Publication date: 1999/03
  • Document available for consultation in the library of the IIR headquarters only.

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