摘要:
针对超高速碰撞产生的瞬态等离子体的特点,利用建立的扫描朗缪尔探针、朗缪尔三探针诊断系
统及线圈系统,测量了超高速碰撞喷出物产生的膨胀等离子体云中等离子体的特征参量和磁感应强度。在传
感器布局和方位角固定的前提下,进行了2种碰撞速度、相同入射角度条件下2024-T4铝弹丸超高速碰撞
2024-T4铝靶产生的膨胀等离子体云电磁特性的实验室测量。实验结果表明,碰撞产生的等离子体的平均电
子温度为0.4~0.9eV,电子密度在1012cm-3量级,线圈的磁感应强度幅值为10~20nT 。通过数据处理,获
得了2种实验条件下整个物理过程在给定探针、线圈位置处等离子体的电子温度、电子密度和磁感应强度与
碰撞速度的关系,并对扫描朗缪尔探针和朗缪尔三探针的测量结果进行了比较。
Abstract:
Accordingtothecharacteristicsoftransientplasmaejectorscreatedbyhypervelocityimpact,
thesweepLangmuirprobe,thetripleLangmuirprobeandthecoilmeasurementsystemswere
establishedtomeasuretheplasmacharacteristicparametersaswellasthemagneticinductionintensity
inexpandingplasmacloud.Basedonthegivenlayoutandazimuthangleofthesensors,theelectromagneticcharacteristicmeasurementsofexpandingplasmacloudgeneratedbytheimpactof2024-
T4
aluminumprojectilesagainstthe2024-T4aluminumtargetsinthelaboratorywerecarriedoutatthe
twoimpactvelocities.Experimentalresultsshowthattheaverageelectrontemperature,electrondensity,
andmagneticinductionintensityamplitudevalueare0.4~0.9eV,ontheorderof1012cm-3and
10~20nT,respectively.Byprocessingtheexperimentaldata,therelationshipsbetweenelectron
temperature,electrondensityand magneticinductionintensitywereobtained,respectively,atthe
givenpositionsoftheprobesandcoilsduringthewholephysicalprocessforthetwoexperiments.And
theresultsmeasuredbythesweepLangmuirprobeandthetripleLangmuirprobewerecompared.
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