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Journal Articles

Visualization of internal structures of reactor core in the HTTR; Proposal of non-destructive inspection by cosmic-ray muon radiography

Takamatsu, Kuniyoshi

Hokeikyo Nyusu, (56), p.2 - 4, 2015/10

http://www.irm.or.jp/news56.pdf

JP, 2010-166333

Licensable Patent Information Database

Patent publication (In Japanese)

In our study, we focused on a nondestructive inspection method by cosmic-ray muons which could be used to observe the internal reactor from outside the RPV and the CV. We conducted an observation test on the HTTR to evaluate the applicability of the method to the internal visualization of a reactor. We also analytically evaluated the resolution of existing muon telescopes to assess their suitability for the HTTR observation, and were able to detect the major structures of the HTTR based on the distribution of the surface densities calculated from the coincidences measured by the telescopes. Our findings suggested that existing muon telescopes could be used for muon observation of the internal reactor from outside the RPV and CV.

Journal Articles

Visualization of internal structures of reactor core in the HTTR by cosmic-ray muon radiography; Non-destructive inspection of internal structures of reactor core

Takamatsu, Kuniyoshi

Nihon Genshiryoku Gakkai-Shi ATOMO, 57(6), p.389 - 393, 2015/06

JP, 2010-166333 Licensable Patent Information Database Patent publication (In Japanese)

In our study, we focused on a nondestructive inspection method by cosmic-ray muons which could be used to observe the internal reactor from outside the RPV and the CV. We conducted an observation test on the HTTR to evaluate the applicability of the method to the internal visualization of a reactor. We also analytically evaluated the resolution of existing muon telescopes to assess their suitability for the HTTR observation, and were able to detect the major structures of the HTTR based on the distribution of the surface densities calculated from the coincidences measured by the telescopes. Our findings suggested that existing muon telescopes could be used for muon observation of the internal reactor from outside the RPV and CV.

Journal Articles

Cosmic-ray muon radiography for reactor core observation

Takamatsu, Kuniyoshi; Takegami, Hiroaki; Ito, Chikara; Suzuki, Keiichi*; Onuma, Hiroshi*; Hino, Ryutaro; Okumura, Tadahiko*

Annals of Nuclear Energy, 78, p.166 - 175, 2015/04

https://doi.org/10.1016/j.anucene.2014.12.017

Times Cited Count：13 Percentile：69.93(Nuclear Science & Technology)

In our study, we focused on a nondestructive inspection method by which cosmic-ray muons could be used to observe the internal reactor from outside the RPV and the CV. We conducted an observation test on the HTTR to evaluate the applicability of the method to the internal visualization of a reactor. We also analytically evaluated the resolution of existing muon telescopes to assess their suitability for the HTTR observation, and were able to detect the major structures of the HTTR based on the distribution of the surface densities calculated from the coincidences measured by the telescopes. Our findings suggested that existing muon telescopes could be used for muon observation of the internal reactor from outside the RPV and CV.

Journal Articles

Plasma wakefield acceleration for ultrahigh-energy cosmic rays

Chen, P.*; Tajima, Toshiki; Takahashi, Yoshiyuki*

Physical Review Letters, 89(16), p.161101_1 - 161101_4, 2002/10

https://doi.org/10.1103/PhysRevLett.89.161101

Times Cited Count：103 Percentile：92.33(Physics, Multidisciplinary)

A cosmic acceleration mechanism is introduced which is based on the wakefields excited by the Alfven shocks in a relativistically flowing plasma,where the energy gain per distance of a test particle is Lorentz invariant. We show that there exists a threshold condition for transparency below which the accelerating particle is collision-free and suffers little energy loss in the plasma medium. The stochastic encounters of the random accelerating-decelerating phases results in a power-law energy spectrum: 1/E $^{2}$ . The environment suitable for such plasma wakefield acceleration can be cosmically abundant. As an example, we discuss the possible production of super-GZK ultra high energy cosmic rays ( UHECR ) through this mechanism in the atmosphere of gamma ray bursts. We show that the acceleration gradient can be as high as 10 $^{16}$ eV/cm. The estimated event rate in our model agrees with that from UHECR observations.