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Featured researches published by Neng Pu.


Plasma Physics and Controlled Fusion | 2016

The behavior of neutron emissions during ICRF minority heating of plasma at EAST

G Q Zhong; Hongrui Cao; Liqun Hu; R. J. Zhou; Min Xiao; Kai Li; Neng Pu; J. Huang; Guangzhu Liu; S. Y. Lin; B. Lyu; Haiqing Liu; Xinjun Zhang; East Team

Ion cyclotron radio frequency (ICRF) wave heating is a primary method to heat ions in the Experimental Advanced Superconducting Tokamak (EAST). Through neutron diagnostics, effective ion heating was observed in hydrogenminority heating (MH) scenarios. At present, investigation of deuterium–deuterium (DD) fusion neutrons is mostly based on time-resolved flux monitor and spectrometer measurements. When the ICRF was applied, the neutron intensity became one order higher. The H/H + D ratio was in the range of 5–10%, corresponding to the hydrogen MH dominated scenario, and a strong high energy tail was not displayed on the neutron spectrum that was measured by a liquid scintillator. Moreover, ion temperature in the plasma center (T i) was inversely calculated by the use of neutron source strength (S n) and the plasma density based on classical fusion reaction equations. This result indicates that T i increases by approximately 30% in L-mode plasma, and by more than 50% in H-mode plasma during ICRF heating, which shows good agreement with x-ray crystal spectrometer (XCS) diagnostics. Finally, the DD neutron source strength scaling law, with regard to plasma current (I P) and ICRF coupling power (P RF) on the typical minority heating condition, was obtained by statistical analysis.


Review of Scientific Instruments | 2018

High detection efficiency scintillating fiber detector for time-resolved measurement of triton burnup 14 MeV neutron in deuterium plasma experiment

Kunihiro Ogawa; M. Isobe; Takeo Nishitani; Eiji Takada; Hiroki Kawase; Tatsuki Amitani; Neng Pu; Jungmin Jo; MunSeong Cheon; Junghee Kim; Misako Miwa; S. Matsuyama; Isao Murata

The behavior of the 1 MeV triton has been studied in order to understand the alpha particle confinement property in the deuterium operation of toroidal fusion devices. To obtain time evolution of the deuterium-tritium (D-T) neutron emission rate where the secondary DT neutron emission rate is approximately 1012 n/s, we designed two high detection efficiency scintillating fiber (Sci-Fi) detectors: a 1 mm-diameter scintillation fiber-based detector Sci-Fi1 and a 2 mm-diameter scintillation fiber-based detector Sci-Fi2. The test in an accelerator-based neutron generator was performed. The result shows that the directionality of each detector is 15° and 25°, respectively. It is found that detection efficiency for DT neutrons is around 0.23 counts/n cm2 for the Sci-Fi1 detector and is around 1.0 counts/n cm2 for the Sci-Fi2 detector.


Review of Scientific Instruments | 2017

In situ calibration of neutron activation system on the large helical device

Neng Pu; T. Nishitani; M. Isobe; Kunihiro Ogawa; Hiroki Kawase; Tomoyo Tanaka; Siyuan Li; Sachiko Yoshihashi; Akira Uritani

In situ calibration of the neutron activation system on the Large Helical Device (LHD) was performed by using an intense 252Cf neutron source. To simulate a ring-shaped neutron source, we installed a railway inside the LHD vacuum vessel and made a train loaded with the 252Cf source run along a typical magnetic axis position. Three activation capsules loaded with thirty pieces of indium foils stacked with total mass of approximately 18 g were prepared. Each capsule was irradiated over 15 h while the train was circulating. The activation response coefficient (9.4 ± 1.2) × 10-8 of 115In(n, n)115mIn reaction obtained from the experiment is in good agreement with results from three-dimensional neutron transport calculations using the Monte Carlo neutron transport simulation code 6. The activation response coefficients of 2.45 MeV birth neutron and secondary 14.1 MeV neutron from deuterium plasma were evaluated from the activation response coefficient obtained in this calibration experiment with results from three-dimensional neutron calculations using the Monte Carlo neutron transport simulation code 6.


Review of Scientific Instruments | 2016

Status of neutron diagnostics on the experimental advanced superconducting tokamak

G Q Zhong; L. Q. Hu; Neng Pu; R. J. Zhou; Min Xiao; H. R. Cao; Y. B. Zhu; Kai Li; T. S. Fan; X. Y. Peng; T. F. Du; L. J. Ge; Jia-Qi Huang; G. Xu; B. N. Wan; East Team

Neutron diagnostics have become a significant means to study energetic particles in high power auxiliary heating plasmas on the Experimental Advanced Superconducting Tokamak (EAST). Several kinds of neutron diagnostic systems have been implemented for time-resolved measurements of D-D neutron flux, fluctuation, emission profile, and spectrum. All detectors have been calibrated in laboratory, and in situ calibration using 252Cf neutron source in EAST is in preparation. A new technology of digitized pulse signal processing is adopted in a wide dynamic range neutron flux monitor, compact recoil proton spectrometer, and time of flight spectrometer. Improvements will be made continuously to the system to achieve better adaptation to the EASTs harsh γ-ray and electro-magnetic radiation environment.


Review of Scientific Instruments | 2018

Scintillating fiber detectors for time evolution measurement of the triton burnup on the Large Helical Device

Neng Pu; T. Nishitani; Kunihiro Ogawa; M. Isobe

Two scintillating fiber (Sci-Fi) detectors have been operated in the first deuterium plasma campaign of the Large Helical Device in order to investigate the time evolution of the triton burnup through secondary 14 MeV neutron measurement. Two detectors use scintillating fibers of 1 mm diameter embedded in an aluminum matrix with a length of 10 cm connected to the magnetic field resistant photomultiplier. A detector with 91 fibers was developed in the Los Alamos National Laboratory and has been employed on JT-60U. Another detector with 109 fibers has been developed in the National Institute for Fusion Science. The signals are fed into a discriminator of 300 MHz bandwidth with a pulse counter module for online measurement and a digitizer of 1 GHz sampling with 14 bits to acquire pulse shape information for offline data analysis. The triton burnup ratio has been evaluated shot-by-shot by the 14 MeV neutron measurement of Sci-Fi detectors which are calibrated by using the neutron activation system and the total neutron measurement of the neutron flux monitor using 235U fission chambers.


Nuclear Fusion | 2018

Time-resolved triton burnup measurement using the scintillating fiber detector in the Large Helical Device

Kunihiro Ogawa; M. Isobe; T. Nishitani; S. Murakami; R. Seki; Motoki Nakata; Eiji Takada; Hiroki Kawase; Neng Pu


IEEE Transactions on Plasma Science | 2018

Neutron Diagnostics in the Large Helical Device

M. Isobe; Kunihiro Ogawa; T. Nishitani; Hitoshi Miyake; T. Kobuchi; Neng Pu; Hoiroki Kawase; Eiji Takada; Tomoyo Tanaka; Siyuan Li; Sachiko Yoshihashi; Akira Uritani; Jungmin Jo; S. Murakami; Masaki Osakabe


IEEE Transactions on Plasma Science | 2018

Estimation of the Fast-Ion Anisotropy Effect on the Neutron Source Intensity Measurement and the Experimental Observation

T. Nishitani; Hideaki Matsuura; Neng Pu; Kunihiro Ogawa; Hiroki Kawase; M. Isobe


Plasma Science & Technology | 2018

Study of first orbit losses of 1 MeV tritons using the Lorentz orbit code in the LHD

Kunihiro Ogawa; M. Isobe; T. Nishitani; S. Murakami; Ryosuke Seki; Hideo Nuga; Neng Pu; Masaki Osakabe


Plasma Physics and Controlled Fusion | 2018

Time dependent neutron emission rate analysis for neutral-beam-heated deuterium plasmas in a helical system and tokamaks

Kunihiro Ogawa; M. Isobe; T. Nishitani; R. Seki; Hideo Nuga; S. Murakami; Motoki Nakata; Neng Pu; Masaki Osakabe; Jungmin Jo; MunSeong Cheon; Junghee Kim; G Q Zhong; Min Xiao; Liqun Hu

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M. Isobe

Graduate University for Advanced Studies

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Kunihiro Ogawa

Graduate University for Advanced Studies

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T. Nishitani

Japan Atomic Energy Agency

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Hiroki Kawase

Graduate University for Advanced Studies

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Eiji Takada

Toyama National College of Technology

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Masaki Osakabe

Graduate University for Advanced Studies

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Jungmin Jo

Seoul National University

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R. Seki

Graduate University for Advanced Studies

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