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Study of runaway electron behaviour during electron cyclotron resonance heating in the HL-2A Tokamak
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During the current flat-top phase of electron cyclotron
resonance heating discharges in the HL-2A Tokamak, the behaviour of
runaway electrons has been studied by means of hard x-ray detectors
and neutron diagnostics. During electron cyclotron resonance
heating, it can be found that both hard x-ray radiation intensity
and neutron emission flux fall rapidly to a very low level, which
suggests that runaway electrons have been suppressed by electron
cyclotron resonance heating. From the set of discharges studied in
the present experiments, it has also been observed that the
efficiency of runaway suppression by electron cyclotron resonance
heating was apparently affected by two factors: electron cyclotron
resonance heating power and duration. These results have been
analysed by using a test particle model. The decrease of the
toroidal electric field due to electron cyclotron resonance heating
results in a rapid fall in the runaway electron energy that may lead
to a suppression of runaway electrons. During electron cyclotron
resonance heating with different powers and durations, the runaway
electrons will experience different slowing down processes. These
different decay processes are the major cause for influencing the
efficiency of runaway suppression. This result is related to the
safe operation of the Tokamak and may bring an effective control of
runaway electrons. 相似文献
63.
分析了HL-2A 实验中可能存在的各种故障问题,设计并开发了一种基于EPICS 网络的实时监测和报警系统。通过SNMP 协议,以EPICS 网络为基础,进行全域的消息监控及实时报警。实现了有效监控实验运行过程中整个IT 系统、控制系统、采集主机等异常情况,并实时进行电话报警、短信报警、邮件报警,有效解决了实验中遇到的各种故障监测及可能引发的问题。 相似文献
64.
曹建勇 魏会领 刘鹤 邹桂清 杨宪福 张贤明 唐立新 罗萃文 余佩炫 耿少飞 周红霞 周博文 李青 何峰 罗怀宇 周健 任磊磊 潘春花 黄高扬 雷光玖 饶军 段旭如 《强激光与粒子束》2018,30(10):106001-1-106001-9
为开展磁约束堆芯燃烧等离子体物理实验,正在建造的HL-2M装置拟建造3条5 MW的中性束注入加热束线。简要概述了HL-2M装置NBI加热系统的总体规划,第1条5MW-NBI加热束线的设计,离子源调试实验,注入器核心部件的安装和测试结果。通过调试,目前单个离子源引出束流达到36 A,加速电压75 kV,离子束功率达到2.4 MW,脉冲宽度3 s。通过测试发现:注入器的4条离子束汇聚角误差小于±0.1°,残留离子偏转磁体的磁场测试值与模拟计算值偏差小于±5%,注入器静态真空值达到1.0×10-3 Pa。注入器采用大型非标低温泵,低温泵的抽速达到2.40×106 L/s。第1条5MW-NBI加热束线的试装和测试结果表明,该束线能够满足HL-2M装置NBI加热的技术要求。 相似文献