Commissioning of helium injector for coupled radio frequency quadrupole and separated function radio frequency quadrupole accelerator.
Commissioning of helium injector for coupled radio frequency quadrupole and separated function radio frequency quadrupole accelerator.
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DOI：
10.1063/1.4828375
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发表时间：
2014-02
期刊：
影响因子：
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通讯作者：
S. Peng;Jia Chen;H. Ren;Jie Zhao;Yuan Xu;Zhang Tao;A. Zhang;W. Xia;Shuli Gao;Zhi Wang;Yuting Luo;Zhiyu Guo;Jia'er Chen
中科院分区：
文献类型：
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作者：
S. Peng;Jia Chen;H. Ren;Jie Zhao;Yuan Xu;Zhang Tao;A. Zhang;W. Xia;Shuli Gao;Zhi Wang;Yuting Luo;Zhiyu Guo;Jia'er Chen
北京大学开展了一项新型加速结构的研究，将传统的射频四极(RFQ)和分离功能的射频四极耦合在一个腔内，以加速He+束流。为此，研制了一种氦气喷射器。该注入器由2.45 GHz永磁体电子回旋共振离子源和1.16m长的低能束流输运(LEBT)组成。该喷油器已进行调试，并于2013年6月进行了现场测试。一束能量为30keV的14 mA He+束被送到LEBT的末端，在那里有一个直径为7 mm的横隔膜。隔膜的位置对应于RFQ电极的入口。测量了7 mm膜片后的束流发射度和束流分数。其均方根发射度约为0.14πmm mrad，He+的含量约为99%。
A project to study a new type of acceleration structure has been launched at Peking University, in which a traditional radio frequency quadrupole (RFQ) and a separated function radio frequency quadrupole are coupled in one cavity to accelerate the He+ beam. A helium injector for this project is developed. The injector consists of a 2.45 GHz permanent magnet electron cyclotron resonance ion source and a 1.16 m long low energy beam transport (LEBT). The commissioning of this injector was carried out and an onsite test was held in June 2013. A 14 mA He+ beam with the energy of 30 keV has been delivered to the end of the LEBT, where a diaphragm with the diameter of 7 mm is located. The position of the diaphragm corresponds to the entrance of the RFQ electrodes. The beam emittance and fraction were measured after the 7 mm diaphragm. Its rms emittance is about 0.14 π mm mrad and the fraction of He+ is about 99%.