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带有内电流环所产生的表面磁场的轴对称磁镜装置(图1)具有很多优点。主要是因为内部磁场很弱,可以进行各种高β实验,并可在很大范围内改变磁镜比,以检验磁镜比的定标。 但处于等离子体内的电流环以及表面磁场形态的引进也带来另外一些问题。其一是内电流环在其内侧产生一个反向磁场,与装置主磁场抵消,形成一个围成圆形的零磁场线。这线附近的磁场为线会切形态,磁场很弱。当粒子运行到附近时,绝热条件|γ_c·B| 《B不再成立。其中r_c为粒子拉摩半径,B为磁场。因此,运行到这一区域的粒子受到一无规的散射,使部分粒子进入损失锥,造成粒子损失。
Axisymmetric magnetic mirror devices with a surface magnetic field generated by an inner current loop (Figure 1) have many advantages. Mainly because of the weak internal magnetic field, a variety of high-beta experiments are possible and the magnetic mirror ratio can be varied over a wide range to verify the calibration of the magnetic mirror ratio. However, the introduction of a current loop in the plasma and the morphology of the surface magnetic field poses additional problems. One is that the inner current loop produces a reverse magnetic field on its inner side that counteracts the main magnetic field of the device to form a zero magnetic field line enclosed by a circle. The magnetic field near this line is in the shape of a line and the magnetic field is very weak. When particles move to the vicinity, the adiabatic condition | γ_c · B | "B no longer holds. Where r_c is the radius of particle pull, B is the magnetic field. As a result, particles traveling to this area receive a random scattering that causes part of the particles to enter the cone of loss, causing particle losses.