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Volume 36 Issue 4
Mar.  2020
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Article Navigation >  Nuclear Physics Review  > 2019  >  36(4): 414-418

CHEN Han, XU Shiwei, WU Qi, LI Yunju, CHEN Lihua, GAO Bingshui, SUN Liangting, TANG Xiaodong. Identification of the A/q=2 Beam Species from the JUNA Deep Underground Accelerator by Nuclear Reaction Method for the First Time[J]. Nuclear Physics Review, 2019, 36(4): 414-418. doi: 10.11804/NuclPhysRev.36.04.414
Citation: CHEN Han, XU Shiwei, WU Qi, LI Yunju, CHEN Lihua, GAO Bingshui, SUN Liangting, TANG Xiaodong. Identification of the A/q=2 Beam Species from the JUNA Deep Underground Accelerator by Nuclear Reaction Method for the First Time[J]. Nuclear Physics Review, 2019, 36(4): 414-418. doi: 10.11804/NuclPhysRev.36.04.414
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Identification of the A/q=2 Beam Species from the JUNA Deep Underground Accelerator by Nuclear Reaction Method for the First Time

doi: 10.11804/NuclPhysRev.36.04.414
  • 1.

    Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;

  • 2.

    University of Chinese Academy of Sciences, Beijing 100049, China;

  • 3.

    China Institute of Atomic Energy, Beijing 102413, China

Funds:  National Natural Science Foundation of China(11490564, 11021504, 11321064, 11475228, 11490564);Equipment Research and Development Project of Chinese Academy of Sciences(28Y531040)
  • Received Date: 2019-11-10
  • Rev Recd Date: 2019-11-27
  • Publish Date: 2019-12-20
  • The Jinping Underground laboratory for Nuclear Astrophysics(JUNA) group is planing to take the advantage of the ultra-low background of China Jinping Underground Laboartory(CJPL) and a high current accelerator based on an 2.45 GHz ECR ion source to study some key reactions of the nuclear astrophysics at their stellar energies for the first time. The experiments in JUNA project need proton, He+ and He2+ beams with intensities of 10, 10 and 2 emA, respectively. The most challenging part of the design and fabrication of ECR ion source is the production of the He2+ beam with intensities at the level of milliamperes. The traditional particle identification method based on magnetic rigidity is difficult to distinguish the He2+ and H+ ions because of their similar mass-to-charge ratios. Therefore, a novel method using nuclear reactions has been developed in this work for the identification of A/q=2 beam species from the ion source. The result shows that the 2.45 GHz ECR ion source can't produce the He2+ beam with a intensity of milliampere. Based on this result, a 14.5 GHz ECR ion source has been developed which has produced 2 emA He2+ beam successfully.
  • [1] CHENG J P, KANG K J, LI J M, et al. Annual Review of Nuclear and Particle Science, 2017, 67:231.
    [2] Yu-CHENG W, XI-QING H, QIAN Y, et al. Chinese physics C, 2013, 37(8):086001.
    [3] LIU Weiping, LI Zhihong, HE Jianjun, et al. Science China Physics, Mechanics&Astronomy, 2016, 59(4):642001.
    [4] LIU Weiping, LI Zhihong, HE Jianjun, et al. Atomic Energy Science and Technology, 2019, 53(10):1729.(in Chinese)(柳卫平,李志宏,何建军,等.原子能科学技术, 2019, 53(10):1729.)
    [5] WU Q, ZHANG Z, SUN L, et al. Review of Scientific Instruments, 2014, 85(2):02A703.
    [6] MENG Z, SHI X P, ZHI Z S, et al. Chinese Physics C, 2008, 32(S1):220.
    [7] MELCHERTY F, MEUSERY S, KRUDENERY S, et al. J Phys B-At Mol Opt Phys, 1997, 30:L697.
    [8] REN H, PENG S, XU Y, et al. Science China Physics, Mechanics&Astronomy, 2013, 56(10):2016.
    [9] BROWN D A, CHADWICK M B, CAPOTE R, et al. Nuclear Data Sheets, 2018, 148:1.
    [10] WU Q, SUN L T, CUI B Q, et al. Nucl Instr and Meth A, 2016, 830:214.
    [11] CHEN Han, XU Shiwei, ZHANG Ningtao, et al. Science China Physics, Mechanics&Astronomy, 2018, 61(5):052021.
    [12] WU Qi. Progress Report on High Current Ion Sources and Low Energy Beam Lines in JUNA[R]. JUNA Group Meeting, 2016-10-18, unpublished.(in Chinese)(武启.锦屏强流离子源及低能束运线进展报告[R]. JUNA组会, 2016-10-18.)
    [13] SUN Liangting, ZHAO Hongwei, ZHANG Zimin, et al. Nuclear Techniques, 2006, 29(2):85.(in Chinese)(孙良亭,赵红卫,张子民,等.核技术, 2006, 29(2):85.)
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Identification of the A/q=2 Beam Species from the JUNA Deep Underground Accelerator by Nuclear Reaction Method for the First Time

doi: 10.11804/NuclPhysRev.36.04.414
  • 1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
  • 2. University of Chinese Academy of Sciences, Beijing 100049, China;
  • 3. China Institute of Atomic Energy, Beijing 102413, China
Funds:  National Natural Science Foundation of China(11490564, 11021504, 11321064, 11475228, 11490564);Equipment Research and Development Project of Chinese Academy of Sciences(28Y531040)
  • Received Date: 2019-11-10
  • Rev Recd Date: 2019-11-27
  • Publish Date: 2019-12-20

Abstract: The Jinping Underground laboratory for Nuclear Astrophysics(JUNA) group is planing to take the advantage of the ultra-low background of China Jinping Underground Laboartory(CJPL) and a high current accelerator based on an 2.45 GHz ECR ion source to study some key reactions of the nuclear astrophysics at their stellar energies for the first time. The experiments in JUNA project need proton, He+ and He2+ beams with intensities of 10, 10 and 2 emA, respectively. The most challenging part of the design and fabrication of ECR ion source is the production of the He2+ beam with intensities at the level of milliamperes. The traditional particle identification method based on magnetic rigidity is difficult to distinguish the He2+ and H+ ions because of their similar mass-to-charge ratios. Therefore, a novel method using nuclear reactions has been developed in this work for the identification of A/q=2 beam species from the ion source. The result shows that the 2.45 GHz ECR ion source can't produce the He2+ beam with a intensity of milliampere. Based on this result, a 14.5 GHz ECR ion source has been developed which has produced 2 emA He2+ beam successfully.

CHEN Han, XU Shiwei, WU Qi, LI Yunju, CHEN Lihua, GAO Bingshui, SUN Liangting, TANG Xiaodong. Identification of the A/q=2 Beam Species from the JUNA Deep Underground Accelerator by Nuclear Reaction Method for the First Time[J]. Nuclear Physics Review, 2019, 36(4): 414-418. doi: 10.11804/NuclPhysRev.36.04.414
Citation: CHEN Han, XU Shiwei, WU Qi, LI Yunju, CHEN Lihua, GAO Bingshui, SUN Liangting, TANG Xiaodong. Identification of the A/q=2 Beam Species from the JUNA Deep Underground Accelerator by Nuclear Reaction Method for the First Time[J]. Nuclear Physics Review, 2019, 36(4): 414-418. doi: 10.11804/NuclPhysRev.36.04.414
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