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Cryogenic systems for two superconducting cyclotrons under development at CIAE.

Number: pap. 88

Author(s) : ZHANG S., YIN M., WANG C., et al.

Summary

Two proton therapy superconducting cyclotrons using NbTi superconducting coils and warm iron yokes as main magnet, namely the CYCIAE-230 and the CYCIAE-250, are currently under development at China Institute of Atomic Energy (CIAE). In this paper, the cryogenic systems based on the liquid helium zeroboiling- off technology for the CYCIAE-230 and the CYCIAE-250 superconducting cyclotrons is described. At first, the structure of the cryostat with helium gas re-condenser has been illustrated, and then the heat loads from conduction, thermal radiation and convection have been calculated. Based on performed calculations, 4 two-stage GM coolers with total cooling power of 5.5 W @ 4.2 K and 2 single-stage GM refrigerators with the total cooling power of 170 W @ 77 K are installed on the helium re-condenser and the thermal shield of the cryostat respectively to maintain the cryogenics needed by the NbTi superconducting coils. The cooling down test results of the cryogenic system of CYCIAE-230 show that the superconducting magnet can achieve 4.2 K in 65 hours. The highlights of over a year’s continues operation of the cryogenic system are also presented.

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Details

  • Original title: Cryogenic systems for two superconducting cyclotrons under development at CIAE.
  • Record ID : 30025812
  • Languages: English
  • Source: Cryogenics 2019. Proceedings of the 15th IIR International Conference: Prague, Czech Republic, April 8-11, 2019.
  • Publication date: 2019/05/08
  • DOI: http://dx.doi.org/10.18462/iir.cryo.2019.0088

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