DEVELOPMENT OF RADIATION RESISTANT MAGNET COIL WITH NEW INDIRECT COOLING METHOD.

研发项目的目的是：(1)研制2000A、60m长、完全矿物绝缘的电磁电缆；(2)采用新的线圈间接冷却方式。项目历时两年，研究了长度大于60 m、截面较大的矿物绝缘电缆（MIC）的拉拔方法。经过几次试验，我们最终决定采用双阶段绘图。在第二年，我们准备了几个2000A级MIC的短样品。用它们进行了弯曲试验和绝缘试验，确定了2000A级MIC的最终截面。60m MIC的最后和主要样品就这样制作出来了。最终制造的MIC数量为3个。现在磁铁线圈正在建设中。MIC与冷却水管之间的焊接温度控制是一个技术难点。新线圈的励磁试验计划在下一个财政年度进行。

Purpose of the R&D project was to : (1) develop magnet cable for 2000A and 60 m long with complete mineral insulation, (2) employ new indirect cooling method for the coil.The project continued two years, we investigated the drawing method of the mineral insulation cable (MIC) of more than 60 m length with relatively large cross section. After several trials, we finally decided to employ double stage drawing.In the second year, we prepared several short samples of 2000A class MIC. Bending tests and insulation tests were performed with them, and final cross section of the 2000A class MIC was determined. The last and main samples of 60m MIC were thus fabricated. Number of the finally fabricated MIC is three. Now the magnet coil is under construction. The temperature control of the soldering between MIC and cooling water pipe was some technical difficulty. The excitation test of the new coil is scheduled in the next fiscal year.