Storage-ring magnets

Storage Ring Magnets

Synchrotrons produce electromagnetic radiation, major applications of which include condensed matter physics, materials science, biology and medicine. Synchrotron storage rings typically use a number of very large copper electromagnets, consuming vast amounts energy and cooling water.

HTS Storage Ring Magnets can be employed to provide significant energy savings: HTS-110’s superconducting storage ring dipoles allow synchrotron owners to reduce their electricity bills by up to 80% with equally substantial savings in cooling water. The very high current density of HTS wire compared with copper allows more compact coil geometries leading to greater design flexibility for the magnet which in turn will deliver greater optical access to the magnet working area.

The HTS magnet is available not just for new facilities: In many instances existing copper coils can be retrofitted with HTS coils without modification of the iron yoke.

Reliability

Synchrotrons require completely reliable magnets that will last the lifetime of the synchrotron. Our design team integrates this requirement into all facets of magnet design and manufacture. We work in partnership with cryogenic system designers and manufacturers to enable full system integration.

Key advantages

  • Reduce energy usage by up to 80%
  • High field possibilities – 1-3+ tesla (iron core designs) or higher with air-core designs
  • Reliable, centralised cryogenic system
  • Retrofit or new site options
  • Payback in less than 5 years depending on configuration

HTS-110 has been involved in two projects which explored HTS Synchrotron Storage Ring applications, validating HTS magnet manufacturing features. These included compact but thermally efficient coil support systems, saggita coil geometries and distributed cooling. The first project was a retrofit of the Brookhaven National Laboratory, and the second a new prototype for NSRRC, Taiwan.

 Brookhaven National Lab Dipole Refit

  • Reverse bend 22.5⁰ angle from NSLS VUV Storage Ring, using 60,000 amp-turns to deliver 1.4 tesla with 55mm Pole Gap
  • Copper coils replaced with HTS
  • Power usage reduced from 15kW to less than 7kW (single magnet)
  • Significant reduction in cooling water required

 NSRRC Taiwan project outcomes

  • HTS-110 Ltd and NSRRC (National synchrotron radiation research centre) designed and fabricated a prototype of a dipole magnet with HTS coils.
  • The HTS magnet was designed to provide stable field strength of 1.19T with field homogeneity less than 1x10-4 in ±20mm when it operates at 50K with a current of 110A.
  • Two single-stage pulse-tube refrigerators are used to cool the top and bottom HTS coils of the magnet.
  • According to estimates of energy saving for 3GeV TPS (Taiwan Photon Source), the energy consumption of 48 HTS dipole magnets operating for 30 years in an open LN2 operation mode can be reduced by a factor of 2.2 when compared to the copper coil dipole magnets.

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