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利用束流截止板热量计原理,测量了诊断中性束(DNB)注入托卡马克的束流功率及束流剖面分布。基于热量截止板上正交分布的13只K型热电偶探针测量出DNB引出束流,在加速极电源49 kV,6 A,100 ms的脉冲放电时,采样铜靶上的最高温升为14℃,从而计算出注入束流功率达到160 kW并得到束剖面分布。同时通过对热量截止板冷却循环水温升测量值在时间上的积分数值计算,也获得了注入束流总功率,为130 kW。分析了两种测量结果存在差异的原因,实验结果表明惯性束截止板热量计方法是测量粒子束流功率及剖面分布的有效手段。
The beam power and beam profile of the diagnostic neutral beam (DNB) injected into the tokamak were measured using the principle of a beam-stop calorimeter. Thirteen K-type thermocouple probes with orthogonal distribution on the heat cut-off plate were used to measure the outgoing beam current of DNB. The maximum temperature rise on the sampled copper target at the accelerating power of 49 kV, 6 A and 100 ms was 14 ℃, so as to calculate the injection beam power of 160 kW and get the beam profile distribution. At the same time, by calculating the integrated value of the measurement value of the circulating cooling water temperature in the heat cut-off plate, the total power of injected beam was also obtained, which was 130 kW. The reasons for the difference between the two measurements are analyzed. The experimental results show that the inertial beam cutoff calorimeter method is an effective measure to measure the particle beam power and profile distribution.