Cryogenic System for the Superconducting Tokamak HT-7U

Journal Article · Mon Jul 15 04:00:00 EDT 2002 · Fusion Science and Technology

OSTI ID:20845848

Hongyu, Bai; Yanfang, Bi; Jingrong, Wang; Ming, Zhuang; Ping, Zhu; Linhai, Sheng; Qiyong, Zhang ^[1]

---

1. Chinese Academy of Sciences (China)

HT-7U is a fully superconducting tokamak. All of the toroidal field and poloidal field superconducting magnets are made of NbTi superconductor and are designed to operate at 3.8 K in the steady-state operation mode. The magnet system will be cooled with forced-flow supercritical helium to this temperature level with an equivalent refrigeration capacity of {approx}2 kW/4.4 K. To satisfy this requirement, a helium refrigerator is designed to be able to provide the cooling power at 3.5, 4.5, and 80 K for the coils, supports, and thermal shields. The refrigerator can also produce liquid helium for the cooling of the current leads. This paper describes the cryogenic system of HT-7U, the refrigeration process and helium plant, and the forced-flow cooling requirement of the superconducting magnets.

• OSTI ID: 20845848
• Journal Information: Fusion Science and Technology, Journal Name: Fusion Science and Technology Journal Issue: 1 Vol. 42; ISSN 1536-1055
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CRYOGENICS
HELIUM
HT-7U TOKAMAK
LIQUIDS
REFRIGERATION
STEADY-STATE CONDITIONS
SUPERCONDUCTING MAGNETS
SUPERCONDUCTORS
THERMAL SHIELDS