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Measurement of Deuteron Induced Thick Target Neutron Yields at 9 MeV
N. Shigyo,K. Hidaka,K. Hirabayashi,Y. Nakamura,D. Moriguchi,M. Kumabe,H. Hirano,S. Hirayama,Y. Naitou,C. Motooka,C. Lan,T. Watanabe,Y. Watanabe,K. Sagara,S. Maebaru,H. Sakaki,H. Takahashi 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The double differential thick target neutron yields from 9 MeV deuteron incidence were measured at the Kyushu University Tandem Accelerator Laboratory. A copper and a titanium foils which are thick enough for a deuteron to stop in the foils were placed at the center of a vacuum chamber. An NE213 liquid organic scintillator was employed to detect neutrons emitted from targets and placed at 9 directions from 0˚ to 140˚. To consider the contribution of scattered neutrons from the floor, we also measured neutron yields with an iron shadow bar located in front of the scintillator. Because incident deuteron beam was not pulsed and the Time-of-Flight method was not applied, the energy spectrum was derived from unfolding the light output spectrum using the FORIST code. The detection efficiency was calculated with the SCINFUL-QMD code. The experimental results were compared with the calculation data of the TALYS code, and it turned out that the calculation data does not reproduce the experimental ones satisfactorily.
Kajimoto, T.,Shigyo, N.,Sanami, T.,Iwamoto, Y.,Hagiwara, M.,Lee, H.S.,Soha, A.,Ramberg, E.,Coleman, R.,Jensen, D.,Leveling, A.,Mokhov, N.V.,Boehnlein, D.,Vaziri, K.,Sakamoto, Y.,Ishibashi, K.,Nakashim North-Holland Physics Pub 2014 Nuclear instruments & methods in physics research. Vol.337 No.-
The energy spectra of neutrons were measured by a time-of-flight method for 120GeV protons on thick graphite, aluminum, copper, and tungsten targets with an NE213 scintillator at the Fermilab Test Beam Facility. Neutron energy spectra were obtained between 25 and 3000MeV at emission angles of 30<SUP>o</SUP>, 45<SUP>o</SUP>, 120<SUP>o</SUP>, and 150<SUP>o</SUP>. The spectra were parameterized as neutron emissions from three moving sources and then compared with theoretical spectra calculated by PHITS and FLUKA codes. The yields of the theoretical spectra were substantially underestimated compared with the yields of measured spectra. The integrated neutron yields from 25 to 3000MeV calculated with PHITS code were 16-36% of the experimental yields and those calculated with FLUKA code were 26-57% of the experimental yields for all targets and emission angles.
HIGH PRECISION TORQUE CONTROL OF BRUSHLESS MOTOR BY PARAMETER IDENTIFICATION
Nobutyki MATUSUI,Masakane SHIGYO 전력전자학회 1989 ICPE(ISPE)논문집 Vol.- No.-
In the paper, the new current control implemented by software of the digital signal processor TMS 32OC25 with a sampling time 100 us is presented. The control is performed based on the instantaneous voltage equation of the brushless motor and the identification of the motor parameters is also performed. Two types of identifications, STR(Self tuning regulator) and MRACS(Model reference adaptive control system), are presented and compared. As the result of identification, the torque control as well as the current control can be performed regardless of the variations of the motor parameters due to, for example, the temoerature rise.
T. Kajimoto,N. Shigyo,K. Ishibashi,D. Moriguchi,Y. Nakamura,H. Arakawa,S. Kunieda,T. Watanabe,R. C. Haight 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
We measured neutron-production double-differential cross-sections by neutron incidence from 50 to 150 MeV. A ^(238)U fission ionization chamber was set to take the incident-neutron flux. Six NE213 liquid scintillators which had a thickness of 12.7 cm and 12.7 cm in diameter, were placed at 15˚, 30˚, 60˚, 90˚, 120˚, and 150˚ to detect neutrons emitted from a sample. The energy of incident neutron was determined by the time of flight (TOF) technique. The energy spectra of neutron emitted from the sample were derived by the unfolding their light output spectra with the response functions of the detectors. The response functions were measured with the spallation neutrons above 25 MeV. In the unfolding process, we assumed that neutron energy spectra reproduced the shape by the moving source model. The neutron-induced neutron-production double-differential cross sections were parameterized with the moving source model by the least-square method. The experimental results were compared with calculations of the PHITS and the TALYS codes.
Itashiki, Yutaro,Imahayashi, Youichi,Shigyo, Nobuhiro,Uozumi, Yusuke,Satoh, Daiki,Kajimoto, Tsuyoshi,Sanami, Toshiya,Koba, Yusuke,Matsufuji, Naruhiro The Korean Association for Radiation Protection 2016 방사선방어학회지 Vol.41 No.4
Background: Carbon ion therapy has achieved satisfactory results. However, patients have a risk to get a secondary cancer. In order to estimate the risk, it is essential to understand particle transportation and nuclear reactions in the patient's body. The particle transport Monte Carlo simulation code is a useful tool to understand them. Since the code validation for heavy ion incident reactions is not enough, the experimental data of the elementary reaction processes are needed. Materials and Methods: We measured neutron production double-differential cross-sections (DDXs) on a carbon bombarded with 430 MeV/nucleon carbon beam at PH2 beam line of HIMAC facility in NIRS. Neutrons produced in the target were measured with NE213 liquid organic scintillators located at six angles of 15, 30, 45, 60, 75, and $90^{\circ}$. Results and Discussion: Neutron production double-differential cross-sections for carbon bombarded with 430 MeV/nucleon carbon ions were measured by the time-of-flight method with NE213 liquid organic scintillators at six angles of 15, 30, 45, 60, 75, and $90^{\circ}$. The cross sections were obtained from 1 MeV to several hundred MeV. The experimental data were compared with calculated results obtained by Monte Carlo simulation codes PHITS, Geant4, and FLUKA. Conclusion: PHITS was able to reproduce neutron production for elementary processes of carbon-carbon reaction precisely the best of three codes.