Status of Laser Ion Source Development in 2018

• 作者: Shen Dingding Sun Liangting Wang Guicai Zhang Junjie Zhang Xuezhen Zhao Hongwei Zhao Huanyu
• 来源期刊: 中国科学院近代物理研究所和兰州重离子研究装置年报:英文版
• 学科: 经济
• 关键词: ATTACHED BEAM FARADAY
• 年，卷（期）: 2018,（1）
• 页码范围: 241-242
• 页数: 2页
• 分类号: F42

摘要

In 2018,the technology of the proton beam production with a laser ion source was developed.To produce proton beams with the laser ion source,a solidified hydrogen target system had been developed by the end of 2017.The experiment on the production of proton beams with the laser ion source was carried out at the beginning of 2018.The 8 ns laser pulse with the 0.5 J energy was focused with a lens of f=500 mm onto the hydrogen ice deposited on a copper sheet attached at the second stage of a 4.2 K cryocooler.The laser power density on the ice was estimated to 2.5109 W
cm−2.As shown in Fig.1(a)and(b),the condition of the hydrogen ice formation can be observed through the laser window before each laser shot.The waveform of the proton beam,shown in Fig.1(c),was measured with a Faraday Cup located 2.5 m away from the target.As shown in Fig.1(c),the current intensity of the proton beam was much lower than other ion species.And the repeatability of the proton beam pulses was also poor,the main reason of which is that the conditions of the deposited hydrogen ice were quite different from shot to shot.