Molecular hydrogen density measurements of short-pulse, high-density fuelling from a molecular cluster injector
Molecular hydrogen density measurements of short-pulse, high-density fuelling from a molecular cluster injector
复制标题
DOI：
10.1088/0029-5515/52/1/013016
复制
发表时间：
2011
期刊：
影响因子：
3.3
通讯作者：
D. Lundberg;R. Kaita;R. Majeski
中科院分区：
文献类型：
--
作者：
D. Lundberg;R. Kaita;R. Majeski
为了给锂托卡马克实验(LTX)提供短脉冲、高密度燃料，研制了一台分子团簇注入器(MCI)。使用电子束荧光方法，以亚厘米的空间分辨率测量了注入器产生的分子密度分布。该系统经过低温冷却以促进分子团簇的形成，相对于室温超音速气体喷射器，显示出分子密度的显著增加。用2 5 0µS时间分辨率测量了短脉冲(3-5ms)的瞬时特性，发现喷流激波结构在该时间尺度上发生了显著的演化。用压力传感器进行的补充测量验证了电子束测量结果。测量的密度分布与适合产生大量分子团簇的超音速流动是一致的。测量的密度和流量适用于LTX等离子体的高密度加注。MCI将被用于研究LTX等离子体的分子团簇燃料物理。
A molecular cluster injector (MCI) has been developed to provide short-pulse, high-density fuelling for the lithium tokamak experiment (LTX). Using an electron-beam fluorescence method, the molecular density profiles produced by the injector are measured with sub-cm spatial resolution. The system, which is cryogenically cooled to promote the formation of molecular clusters, demonstrates a significant increase in molecular density relative to room-temperature supersonic gas injectors. The transient characteristics of short pulses (3–5 ms) are measured with 250 µs temporal resolution, and the jet shock structure is found to evolve significantly on that time scale. Supplemental measurements with a pressure transducer validate the electron-beam measurements. The measured density profiles are consistent with supersonic flows suitable for producing substantial populations of molecular clusters. The measured densities and flow rates are appropriate for high-density fuelling of LTX plasmas. The MCI will be used to investigate the physics of molecular cluster fuelling of LTX plasmas.