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利用安装在直径为800mm 高温激波管后端盖处带有切取器的矩形实验段,获得了较均匀的薄层等离子体鞘层(Z=4cm或2cm)。采用液氦冷却下的低温超导线圈产生连续的强磁场,研究了有强磁场存在条件下3.9GHZ 微波穿透薄等离子体鞘层时的传输特性。对于 Ne≈3×10~13/cm~3,v≈9×10~9/s 和 Ne≈4×10~12/cm~3,v≈2.4×10(?)/s两种等离子体状态,H=0.44～0.84T,分别测量了无外加磁场和有外加磁场情况下电波的功率衰减。实验结果表明在本文所加的磁场强度条件下,测量到的电波功率衰减值均有较明显改善。
A more uniform thin plasma sheath (Z = 4 cm or 2 cm) was obtained using a rectangular experimental section with a slicer installed at the rear end of a shock tube with a diameter of 800 mm. The low-temperature superconducting coils cooled by liquid helium generate a continuous strong magnetic field, and the transmission characteristics of 3.9GHZ microwave penetrating the thin plasma sheath in the presence of a strong magnetic field are studied. For two plasma states of Ne≈3 × 10-13 / cm ~ 3, v≈9 × 10-9 / s and Ne≈4 × 10-12 / cm ~ 3 and v≈2.4 × 10 (?) / S , H = 0.44 ~ 0.84T, respectively, measured without magnetic field and applied magnetic field under the condition of the power attenuation. Experimental results show that in the magnetic field strength added in this paper, the measured power attenuation values have significantly improved.