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Journal Articles

Neutron/$$gamma$$-ray discrimination based on the property and thickness controls of scintillators using Li glass and LiCAF(Ce) in a $$gamma$$-ray field

Kaburagi, Masaaki; Shimazoe, Kenji*; Terasaka, Yuta; Tomita, Hideki*; Yoshihashi, Sachiko*; Yamazaki, Atsushi*; Uritani, Akira*; Takahashi, Hiroyuki*

Nuclear Instruments and Methods in Physics Research A, 1046, p.167636_1 - 167636_8, 2023/01

 Times Cited Count:3 Percentile:92.52(Instruments & Instrumentation)

We focus on the thickness and property controls of inorganic scintillators used for thermal neutron detection in intense $$gamma$$-ray fields without considering pulse shape discrimination techniques. GS20$$^{rm{TM}}$$ (a lithium glass) and LiCaAlF$$_6$$:Ce(LiCAF:Ce) cintillators with thicknesses of 0.5 and 1.0 mm, respectively, have been employed. Pulse signals generated by photomultiplier tubes, to which the scintillators were coupled, were inserted into a digital pulse processing unit with 1 Gsps, and the areas of waveforms were integrated for 360 ns. In a $$^{60}$$Co $$gamma$$-ray field, the neutron detection for GS20$$^{rm{TM}}$$ with a 0.5-mm thickness was possible at dose rates of up to 0.919 Gy/h; however, for LiCAF:Ce, neutron detection was possible at 0.473 Gy/h, and it failed at 0.709 Gy/h. Threfore, in a $$^{60}$$Co $$gamma$$-ray field, the neutron/$$gamma$$-ray discrimination of GS20$$^{rm{TM}}$$ was better than that of LiCAF:Ce due to its better energy resolution and higher detection efficiency.

Journal Articles

Measurement of Li target thickness in the EVEDA Li Test Loop

Kanemura, Takuji; Kondo, Hiroo; Furukawa, Tomohiro; Hirakawa, Yasushi; Hoashi, Eiji*; Yoshihashi, Sachiko*; Horiike, Hiroshi*; Wakai, Eiichi

Fusion Engineering and Design, 98-99, p.1991 - 1997, 2015/10

 Times Cited Count:14 Percentile:75.12(Nuclear Science & Technology)

A high-speed (15 m/s) liquid lithium jet is planned to be utilized as the target of two 40 MeV - 125 mA deuteron beams in the International Fusion Materials Irradiation Facility (IFMIF). The target thickness is required to be maintained within 25 $$pm$$ 1 mm under a vacuum condition of 10$$^{-3}$$ Pa. This paper reports the result of measurements of the Li-target thickness under the IFMIF condition (Li speed of 10 to 20 m/s, vacuum pressure of 10$$^{-3}$$ Pa, Li temperature of 250$$^{circ}$$C) in the EVEDA Li Test Loop. The target thickness was found to be 26.08 mm on average at the speed of 15 m/s at the center of the IFMIF beam footprint. As for temporal fluctuation, average and maximum amplitude at the same measurement position were 0.26 and 1.45 mm, respectively, and more than 99.7% of all amplitudes measured were within the design requirement. Therefore, it was found that the Li target fulfilled the required stability for IFMIF.

Oral presentation

Activities summary on lithium target system and test facilities in IFMIF/EVEDA project, 2; Flow stability of Li target

Kanemura, Takuji; Kondo, Hiroo; Furukawa, Tomohiro; Hirakawa, Yasushi; Hoashi, Eiji*; Yoshihashi, Sachiko*; Horiike, Hiroshi*; Wakai, Eiichi

no journal, , 

A high-speed (15 m/s) liquid lithium jet is planned to serve as the target of two 40 MeV - 125 mA deuteron two-beams in the International Fusion Materials Irradiation Facility (IFMIF). The target thickness is required to be maintained within 25 $$pm$$ 1 mm under a vacuum condition of 10$$^{-3}$$ Pa. In this study, we report the result of measurements of the Li target thickness under the IFMIF condition (Li speed of 15 m/s, vacuum pressure of 10$$^{-3}$$ Pa, Li temperature of 250 $$^{circ}$$C) in the EVEDA Li Test Loop. The target was found to be adequately smooth on average inside the corresponding IFMIF beam footprint. The measurement result of temporal fluctuations showed they were dominated by small waves with amplitude of less than 1 mm, and that the average amplitude at the center of beam footprint was 0.26 mm. Therefore, it was found that the Li target fulfilled the required stability for IFMIF.

Oral presentation

Award lecture; Progress of activities in the IFMIF/EVEDA lithium test loop

Kanemura, Takuji; Kondo, Hiroo; Furukawa, Tomohiro; Hirakawa, Yasushi; Hoashi, Eiji*; Yoshihashi, Sachiko*; Horiike, Hiroshi*; Wakai, Eiichi

no journal, , 

(Award lecture) A high-speed (15 m/s) liquid lithium (Li) jet is to be utilized as the target of two 40 MeV - 125 mA deuteron beams in the International Fusion Materials Irradiation Facility. The target thickness is required to be maintained within 25 $$pm$$ 1 mm under a vacuum condition of 10$$^{-3}$$ Pa. This presentation reports the measurement and analysis results of the Li target thickness at the velocity of 10, 15 and 20 m/s under an Ar pressure of 0.12 MPa. The measurement result showed that the thickness was approx. 26.0 mm $$pm$$ 1.5 mm at the all velocities in the region of interest. Therefore, it was found that the Li target stability under an Ar atmosphere exceeded slightly more than the design requirement. By modeling static pressure gradient, the target thickness was analyzed based on the theory of fluid mechanics. The result showed good agreement with the measurement result, which means the static pressure gradient is a dominant factor for determination of the target thickness.

Oral presentation

Status of lithium target facility development in IFMIF/EVEDA project

Wakai, Eiichi; Kondo, Hiroo; Kanemura, Takuji; Furukawa, Tomohiro; Hirakawa, Yasushi; Nakaniwa, Koichi; Ito, Yuzuru; Tanaka, Hiroshi; Tsuji, Yoshiyuki*; Ito, Takahiro*; et al.

no journal, , 

no abstracts in English

Oral presentation

Measurement of Li-target thickness under high vacuum in the IFMIF/EVEDA Li Test Loop

Kanemura, Takuji; Kondo, Hiroo; Furukawa, Tomohiro; Hirakawa, Yasushi; Hoashi, Eiji*; Yoshihashi, Sachiko*; Horiike, Hiroshi*; Wakai, Eiichi

no journal, , 

A high-speed (15 m/s) liquid lithium jet is planned to be utilized as the target of two 40 MeV - 125 mA deuteron beams in the International Fusion Materials Irradiation Facility (IFMIF). The target thickness is required to be maintained within 25 $$pm$$ 1 mm under a vacuum condition of 10$$^{-3}$$ Pa. This paper reports the result of measurements of the Li-target thickness under the IFMIF condition (Li speed of 10 to 20 m/s, vacuum pressure of 10$$^{-3}$$ Pa, Li temperature of 250$$^{circ}$$C) in the EVEDA Li Test Loop. The target thickness was found to be 26.08 mm on average at the speed of 15 m/s at the center of the IFMIF beam footprint. As for temporal fluctuation, average and maximum amplitude at the same measurement position were 0.26 and 1.45 mm, respectively, and more than 99.7% of all amplitudes measured were within the design requirement. Therefore, it was found that the Li target fulfilled the required stability for IFMIF.

Oral presentation

Free-surface characteristics of liquid-metal wall jet

Kanemura, Takuji; Kondo, Hiroo; Sugiura, Hirokazu*; Hoashi, Eiji*; Yoshihashi, Sachiko*; Muroga, Takeo*; Furukawa, Tomohiro; Hirakawa, Yasushi; Wakai, Eiichi; Horiike, Hiroshi*

no journal, , 

Application studies of liquid metal (LM) wall jets are progressing in nuclear fusion researches. Examples are LM diverters or the Li target of the International Fusion Materials Irradiation Facility (IFMIF). It is important to understand flow characteristics based on measurement in order to judge whether a LM wall jet is feasible as a coolant or a nuclear target. To do so, diagnostics applicable to LM must be developed. The authors started researches on the flow characteristics of the IFMIF Li target in 2002. The diagnostics we developed are a high-speed video camera for visualization of free surface, a contact-type liquid level sensor and a laser probe method for measurement of amplitude of free-surface waves, etc. We have succeeded in understanding the flow characteristics of the Li wall jet by measuring them. The diagnostics we developed are applicable to other LM free-surface flows, and the flow characteristics we obtained are valuable as fundamental data for other LM flows.

Oral presentation

R&D of lithium target and test facilities for the fusion neutron source

Wakai, Eiichi; Kondo, Hiroo; Kanemura, Takuji; Hirakawa, Yasushi; Furukawa, Tomohiro; Kikuchi, Takayuki; Ito, Yuzuru*; Hoashi, Eiji*; Yoshihashi, Sachiko*; Horiike, Hiroshi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Present status of Japanese tasks for lithium target facility under IFMIF/EVEDA, 3; Evaluation of liquid-lithium free-surface flow stability

Kanemura, Takuji; Kondo, Hiroo; Furukawa, Tomohiro; Hirakawa, Yasushi; Yoshihashi, Sachiko*; Hoashi, Eiji*; Yamaoka, Nobuo*; Horiike, Hiroshi*; Wakai, Eiichi

no journal, , 

A high-speed (15 m/s) liquid lithium (Li) jet is planned to be utilized as the target of two 40 MeV - 125 mA deuteron beams in the International Fusion Materials Irradiation Facility. The target thickness is required to be maintained within 25 $$pm$$ 1 mm under a vacuum condition of 10$$^{-3}$$ Pa. This paper presents the measurement results of the Li target thickness at the velocity of 10, 15 and 20 m/s under an Ar pressure of 0.12 MPa. The target was found to be rather smooth and approx. 26 mm in thickness on average at the all velocities in the region of interest. As for temporal variation, average wave amplitude was 0.3 mm at the all velocities in the same region. Therefore, it was found that the Li target stability was completely within the requirement on average under an Ar pressure of 0.12 MPa. The next step is to measure the Li target under the IFMIF condition of 10$$^{-3}$$ Pa.

Oral presentation

Development and advancement of a real-time neutron monitor for boron neutron capture therapy

Ishikawa, Akihisa; Watanabe, Kenichi*; Yoshihashi, Sachiko*; Uritani, Akira*; Tanaka, Hiroki*; Sakurai, Yoshinori*; Masuda, Akihiko*

no journal, , 

no abstracts in English

Oral presentation

Progress of activities in the IFMIF/EVEDA lithium test loop, 2-2; Thickness measurement of Li target

Kanemura, Takuji; Kondo, Hiroo; Furukawa, Tomohiro; Hirakawa, Yasushi; Hoashi, Eiji*; Yoshihashi, Sachiko*; Horiike, Hiroshi*; Wakai, Eiichi

no journal, , 

A high-speed (15 m/s) liquid lithium jet is planned to be utilized as the target of two 40 MeV - 125 mA deuteron beams in the International Fusion Materials Irradiation Facility. The target thickness is required to be maintained within 25 $$pm$$ 1 mm under a vacuum condition of 10$$^{-3}$$ Pa. At present, measurements of the Li target thickness at the velocities of up to 20 m/s under an Ar pressure of 10$$^{-3}$$ Pa $$sim$$ 0.12 MPa have been finished. The target was found to be approx. 26 mm in thickness on average at the velocity of 15 m/s under a pressure of 0.12 MPa in the region of interest. As for temporal variation, average wave amplitude was 0.3 mm under the same condition in the same region. Therefore, it was found that the Li target stability was completely within the requirement on average under an Ar pressure of 0.12 MPa. The analysis of measurement results under the IFMIF condition of 10$$^{-3}$$ Pa are ongoing, and they seem almost identical to the result of 0.12 MPa.

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