射频离子源离子束成分光谱测量

Spectroscopic measurement for ion beam components of radio-frequency ion source

为HL-2A装置中性束注入器研制了引出束功率为1MW的射频离子源。在测试平台上,实验离子源已经成功引出了束能量和束电流分别为35ke V和12.4A、束质子比为79%、脉宽为100ms的氢离子束,达到了设计束功率要求的44%。在射频离子源实验平台上,利用多普勒频移光谱方法测量了离子源引出束流成分比例,对比了束流成分和射频离子源引出束流之间的关系。实验数据分析表明,在10A引出束流的情况下,离子流成分H+1、H+2和H+3分别为75%、18%和7%。并且当引出束流从3.3A升至10.4A时,H+1从37%升至78%,而H+3则从19%降至9%。

A radiofrequency（RF） ion source with beam power of 1 MW is developed for the neutral beam injector on the HL-2 A tokamak. At present, this ion source can deliver a 35 ke V/12.4 A hydrogen ion beam for 100 ms on the test-bed, reaching 44 % of its design beam power. The proton proportion of the beam is 79%. On the RF test platform, the ion source beam composition proportion is measured by using the spectrum of Doppler frequency shift, and the relationships between the beam composition proportion and the beam current from RF ion source are contrasted. The analysis of experimental data indicates that the ion flow compositions of H^＋1, H^＋2 and H^＋3 are 75%, 18% and 7%, respectively, under the condition of 10 A beam current. When the beam current increases from 3.3 A to 10.4 A, the composition proportion of H^＋1 rises from 37% to 78% while H^＋3 falls from 19% to 9%.