Soft X-Ray Emitting Core in a Plasma Focus
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概要
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Soft X-rays emitted from a plasma focus in which ∼1 MA is discharged in argon admixed hydrogen are investigated for the development of a new X-ray source. A time resolved soft X-ray pinhole image near 4 Å of the Ar K-lines and dynamic behavior of the plasma are observed simultaneously. It is found that the soft X-ray images can be typically divided into three categories in spite of the identical experimental condition. This fact makes the soft X-ray emission from the plasma focus device not reproducible. One category shows a highly conspicuous and filamentary source whose radius is ∼0.5 mm, whereas the radius observed by the Moiré Schlieren technique is ∼1.5 mm. The filament has a brightness several times greater than that of the other categories. Finally, the plasma in each of soft X-rays category is disrupted by growth of the m=0 instabilities. The plasma sustaining time was shorter than the characteristic time for the radiation collapse. The Pease-Braginskii current was evaluated to be 0.8 MA. It was concluded that the radiative collapse did not occur although the discharge current exceeded the Pease-Braginskii current.
- Physical Society of Japanの論文
- 1996-01-15