【摘要】 介绍了一套液氮温区入（Ｂ，Ｔ）测量系统，该系统用增大液氮的饱和蒸气压来达到提高液氮温度的目的。用该系统研究了磁场和温度（测量范围分别为０．１Ｔ～０．８Ｔ和７７Ｋ～９０Ｋ）对Ｂｉ－２２２３／Ａｇ多芯带材（１９芯和３７芯）临界电流的影响。更多还原

【Abstract】 A temperature control system was established to measure Jc in a LN2 temperature range (72 K～90 K). A sample of Bi-2223/Ag multifilamentary tape was immersed in LN2, and the desired temperature of the sample was attained by means of changing its saturated vapor pressure. The Jc(B,T) characteristics of Bi-2223/Ag multifilamentary tapes(19 and 37 filaments) in a LN2 temperature range(77 K~～ 90 K) were measured using the measuring system.更多还原