Enhancement of the Stabilization of Superconducting Magnets by Hydro-statically Pressurized He II

Enhancement of the Stabilization of Superconducting Magnets by Hydro-statically Pressurized He II

He II under pressures from 1atm to saturated vapor pressure and constant bath temperature was investigated as a possible coolant for superconducting magnets. The cooling strength is described in terms of a critical frequency fc at which the peak transport currents corresponding to successive constan...

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Veröffentlicht in:TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 1988/12/25, Vol.23(6), pp.350-356
Hauptverfasser: KOBAYASHI, Hisayasu, TADA, Tadashi, KODAMA, Takao, TANAKA, Mineo, TURUGA, Hideo
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container_end_page 356
container_issue 6
container_start_page 350
container_title TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)
container_volume 23
creator KOBAYASHI, Hisayasu
TADA, Tadashi
KODAMA, Takao
TANAKA, Mineo
TURUGA, Hideo
description He II under pressures from 1atm to saturated vapor pressure and constant bath temperature was investigated as a possible coolant for superconducting magnets. The cooling strength is described in terms of a critical frequency fc at which the peak transport currents corresponding to successive constant voltage pulses decrease abruptly due to a breakdown of superfluidity. Maximum fc was found under the pressure at the lower λ-point (He IIλ) i.e. with a hydrostatic pressure head of about 2m. This allows the use of ordinary cryostats while retaining the efficiency of saturated He II systems. He IIλ does not give full stabilization in the classical sense, but is a promising coolant for pulse magnets or meta-stabilized DC magnets.
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title Enhancement of the Stabilization of Superconducting Magnets by Hydro-statically Pressurized He II
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