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Experimental investigation on diagnosing effective atomic density in gas-type target by using proton energy loss

文献类型：期刊论文

作者Chen Yan-Hong4; Cheng Rui4; Zhang Min2,4; Zhou Xian-Ming2,4; Zhao Yong-Tao3; Wang Yu-Yu4; Lei Yu2,4; Ma Peng-Peng1,4; Wang Zhao1,4; Ren Jie-Ru3
刊名ACTA PHYSICA SINICA
出版日期2018-02-20
卷号67页码:044101
关键词proton beam gas target energy loss effective atomic density number
ISSN号1000-3290
DOI10.7498/aps.67.20172028
英文摘要The investigations of interaction processes between ion beams and gas and between ion beams and plasma play important roles in atomic physics, astrophysics, high energy density physics, and inertial confinement fusion. The atomic density of target is one of the key experimental parameters which may determine the interaction mechanism and experimental results. How to precisely diagnose the atomic density of target in different matter states, like gas phase and plasma phase, is challenging work on the experiments in laboratory. Conventionally the vacuum gauges are used to measure the pressure inside the gas target, but the accuracy is limited for a complex target system and they can hardly work in a strong radiation surrounding, especially in plasma where the high temperature can physically damage the gauges. Therefore we propose a new method to measure the atomic densities for both gas target and plasma target based on the heavy ion beam accelerator facility at the Institute of Modern Physics, Chinese Academy of Sciences. In our experiment the protons are extracted from an electron cyclotron resonance ion source (ECRIS) and accelerated to 100 keV then transmitted to the target. A two-stage differential pumping system is constructed to keep 10(-7) mbar order of magnitude in beam line when the gas is filled into the target area where the pressure could increase to higher than 1 mbar. A 45. dipole magnet is used to bend the protons which have passed through the gas. The energy is determined by the different positions of protons at the position-sensitive detector which is placed at the end of magnet. Consequently the energy losses of protons at different pressures are obtained. There have been proposed many theories for calculating the energy loss of protons in gas, and we chose the very popular code named SRIM to simulate the experimental case. Finally the effective linear atomic density of target along the ion beam trajectory in the target area is obtained. For comparison, the conventional vacuum gauges (one is the hot cathode gauge-IonIVac ITR 90 and the other is capacitance diaphragm gauge-Varian CDG-500) are simultaneously used in the experiment. The results show that the recalibrated effective pressure obtained by the energy loss is close to the pressure measured by Varian CDG-500 but much lower than the pressure from IonIVac ITR 90. Only after the detection efficiency correction, could the corrected results of IonIVac ITR 90 be coincident with the effective pressure obtained according to energy loss. Moreover we find that the effective atomic density determined by the protons energy loss shows that these advantages over the conventional gauges are not only the high accuracy and reliability but also the in-situ measurement, high temporal resolution and the ability to work in the complex radiation and hot plasma environment. These properties may play a great role in the experimental researches and relevant topics.
WOS关键词HEAVY-IONS ; HYDROGEN DISCHARGE ; PLASMA TARGET ; MATTER
资助项目State Key Development Program for Basic Research of China[2017YFA0402303] ; National Natural Science Foundation of China[U1532263] ; National Natural Science Foundation of China[11505248] ; National Natural Science Foundation of China[11375034] ; National Natural Science Foundation of China[11775042] ; National Natural Science Foundation of China[11775278] ; National Natural Science Foundation of China[11605147]
WOS研究方向Physics
语种英语
WOS记录号WOS:000428113200009
出版者CHINESE PHYSICAL SOC
资助机构State Key Development Program for Basic Research of China ; National Natural Science Foundation of China
源URL[http://119.78.100.186/handle/113462/46489]  
专题近代物理研究所_实验物理中心
近代物理研究所_兰州重离子研究装置
通讯作者Cheng Rui; Zhao Yong-Tao
作者单位1.Northwest Normal Univ, Lanzhou 730070, Gansu, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Xian Jioatong Univ, Xian 710049, Shaanxi, Peoples R China
4.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式
GB/T 7714		 Chen Yan-Hong,Cheng Rui,Zhang Min,et al. Experimental investigation on diagnosing effective atomic density in gas-type target by using proton energy loss[J]. ACTA PHYSICA SINICA,2018,67:044101.
APA Chen Yan-Hong.,Cheng Rui.,Zhang Min.,Zhou Xian-Ming.,Zhao Yong-Tao.,...&Xiao Guo-Qing.(2018).Experimental investigation on diagnosing effective atomic density in gas-type target by using proton energy loss.ACTA PHYSICA SINICA,67,044101.
MLA Chen Yan-Hong,et al."Experimental investigation on diagnosing effective atomic density in gas-type target by using proton energy loss".ACTA PHYSICA SINICA 67(2018):044101.

入库方式： OAI收割

来源：近代物理研究所

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