Test results of the DPC-TJ: stability performance

Abstract In this paper the stability test results of the DPC-TJ coil are summarized. The DPC-TJ coil is a cable-in-conduit, forced-flow type, large superconducting coil, cooled by supercritical helium. The stability test was performed using an inductive heating method, and the dependences of the stability margins on the operating current and on the duration of heating were investigated. The relation between heating power and the take-off time, defined as the time from the start of heating until the appearance of normalcy in the conductor, was also studied. The main results are as follows: the so-called limiting currents were not obvious with the present test conditions; the influence of the duration of heating on the stability margin was small; and the heating power was inversely proportional to the square root of the take-off time, up to ≈ 20 ms.