Stray magnetic field at plasma initiation produced by ferromagnetic elements of the ITER tokamak complex

Abstract

The stray magnetic fields produced at plasma initiation (in particular at the gas breakdown (BD)) by the ITER tokamak complex building have been studied. The influence of global elements of the tokamak complex building is estimated. The scenario of plasma initiation was designed and simulated using virtual coils with currents producing a magnetic field in the BD region similar to that from the building.

Особенности Моделирования Возмущений Магнитного Поля Электрофизических Установок Стальной Арматурой Зданий

“…Ранее проведeнные расчeты показали [3] заметное влияние намагничивания арматуры на распределение магнитного поля внутри камеры установки ИТЭР в области плазмы, которая чувствительна к возмущениям полей малого уровня.…”

Magnetic model MMTC-2.2 of ITER tokamak complex

“…The model contained a restricted set of the global tokamak building structures described in [3]. The MMTC-1 was used for the assessment of the error fields associated with a global asymmetry of the tokamak complex [3] and stray fields outside [4] and inside [5] the Vacuum Vessel.…”

“…The model MMTC-2.2 includes all the tokamak building structures and the Excavation seismic pit and, therefore, can be considered as a complete magnetic model of the Tokamak Complex. For this reason, the model MMTC-1 appears to be obsolete, and preliminary evaluations in [3][4][5] should be renewed. Corresponding results will be presented elsewhere.…”

“…(one wall is omitted for the SIC rooms view).external walls of the tokamak building (3), internal port cell walls(4), central zone columns (5, if any), port cell doors(6), internal walls (7) with cargo lift doors(8), and internal separate columns (9, if any). At each level the doors at the port cell walls are made of steel with a thickness of 0.782 m. The thickness of the cargo lift doors mounted into the internal walls is 0.153 m. The levels L4-R2(Fig.…”