• Proceedings of the Korean Magnestics Society Conference
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• 2008.12a
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• pp.144.2-144.2
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• 2008

• Nuclear Engineering and Technology
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• v.56 no.2
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• pp.546-551
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• 2024

As an effective methods of plasma heating, neutral beam injection (NBI) systems based on negative hydrogen ion sources will be utilized in future magnetic-confinement nuclear fusion experiments. Because of the collisions between the fast negative ions and the neutral background gas, the positive ions are inevitable created in the acceleration region in the negative NBI system. These positive ions are accelerated back into the ion source and become high energy backstreaming ions. In order to explore the characters of backstreaming ions, the track and power deposition of backstreaming H⁺ beam is estimated using the experimental and simulation methods at NNBI test facility. Results show that the flux of backstreaming positive ions is 1.93 % of that of negative ion extraction from ion source, and the magnet filed in the beam source has an effect on the backstreaming positive ions propagation.

• Proceedings of the Korean Nuclear Society Conference
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• 2004.10a
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• pp.709-710
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• 2004

• Proceedings of the Korean Society of Medical Physics Conference
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• 2006.08a
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• pp.137-137
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• 2006

• 한국전자현미경학회:학술대회논문집
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• 2000.11a
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• pp.59-60
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• 2000

• Proceedings of the Korean Nuclear Society Conference
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• 1999.10a
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• pp.366-366
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• 1999

• The Bulletin of The Korean Astronomical Society
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• v.34 no.1
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• pp.120.1-120.1
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• 2009

• The Bulletin of The Korean Astronomical Society
• /
• v.34 no.1
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• pp.113.1-113.1
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• 2009

• Bulletin of the Korean Space Science Society
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• 2009.04a
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• pp.54.3-55
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• 2009

• Nuclear Engineering and Technology
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• v.53 no.6
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• pp.1964-1969
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• 2021

We developed a Dual-PPACs detector for fast neutron measurements that consists of two sets of PPAC: conventional PPAC and fission PPAC. A²³⁸U(U₃O₈) coating is placed in the fission PPAC's anode, which is used as the neutrons conversion layer. An experiment was performed to measure neutron time-of-flight (TOF) in which ²⁵²Cf spontaneous fission source was used. An excellent time resolution of 164ps has been observed at 6 mbar in isobutene gas. With the excellent time resolution of Dual-PPACs detector, exact neutron energy can be extracted from the timing measurement. The experimental detection efficiency was 1.9 × 10^-7, consistent with the efficiency of 2.5 × 10^-7 given by a Geant4 simulation. Ultimately, the results show that the Dual-PPACs detector is a suitable candidate for measuring fast neutrons in the future CiADS system.