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把Lawson判据(第一判据)应用到聚变堆时,应该增添一个重要参数η_n——聚变堆加热总效率。这样由等离子体温度T,密度n和约束时间τ的乘积与η_n组成了三维空间,用它来描述聚变堆的收支平衡条件(Breakeven Condition),并由此空间中一个曲面来表示,称之为第二判据。在nτ～T二维空间上的Lawson判据只是它的一个特例。第二判据更全面地展示出在收支平衡下,主要参数数值及它们之间的关系,它更符合于实际聚变堆所要求的数值。
When applying the Lawson criterion (first criterion) to the fusion reactor, an important parameter η_n should be added - the overall efficiency of the fusion reactor heating. Thus the product of plasma temperature T, density n, and confinement time τ, forms a three-dimensional space with η_n, which is used to describe the Breakeven Condition of the reactor and is represented by a surface in this space, The second criterion. The Lawson criterion in the two dimensional space is only a special case of it. The second criterion shows more fully the value of the main parameters and the relationship between them under the balance of payments which is more in line with the value required for the actual fusion reactor.