Shielding Experiments at High Energy Accelerators of Fermilab (I) ―Dose Rate Around High Intensity Muon Beam―

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"The shielding experiment was performed at the anti-proton (pbar) production target station in Fermi National Accelerator Laboratory to obtain benchmark data for various transport calculation codes. At the pbar target station, an antiproton production target, consisted of Inconel and copper disks, were irradiated by 120 GeV proton beam. The beam intensity was 2.3 x 10 12 proton per second. The iron and concrete shields were placed on the upper side of the target. The thickness of iron and concrete shields were 188 and 122 cm, respectively. Aluminum, bismuth, and indium samples were placed in the concrete shields to measure the neutron energy spectra in the concrete shields. After irradiation, induced activities in samples were measured by using HPGe detector. The reaction rate spatial distributions of 27 Al (n,Į) 24 Na, 209 Bi (n,xn) 203,204,205,206 Bi, and 115 In (n,n') 115m In reactions were measured in the concrete shields. The neutron energy spectra in the concrete shields were also obtained by unfolding the measured reaction rates with the aid of neutron induced reaction cross sections.

Section: Introductionmentioning

confidence: 94%

Spatial Distribution Measurement of Neutrons Produced by 120-GeV Proton Beam in Concrete Shield

Yashima

Kasugai²,

Matsuda³

et al. 2012

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“…Figure 8 shows geometry of the experiment along the course of the flying muons. Behind the absorber, there are four caves at the flight distances of 0, 13.7, 33.5, and 67.1 m from the rock surface: -Alcove-1,‖ -Alcove-2,‖ -Alcove-3,‖ and -Alcove-4‖ [9].…”

Section: Measurement Of Particle Flux Spectra and Residual Activimentioning

confidence: 99%

“…In order to measure the radiation dose due to the muons and tertiary particles, OSL (Optical Stimulated Luminescence) dosimeter, TLDs (thermoluminescence detectors, Panasonic 813 PQ), solid state nuclear track detectors, CR39, and ionization chamber (IC) were set along the beam axis, the passes from the Alcove to the bypass tunnel. [9] Activation detectors were installed in every Alcove along the beam axis and were irradiated with muons and tertiary particles passing through the rock. In order to measure the radiation dose rates and reaction rates due to the muons and tertiary particles, OSL (Optical Stimulated Luminescence) dosimeter, TLDs (thermo-luminescence detectors, Panasonic 813 PQ), solid state nuclear track detectors, CR39, the Bonner sphere counters and ionization chamber (IC) for neutron and -ray survey were set along the beam axis, the passes to the Alcove and the bypass tunnel [9].…”

Section: Measurement Of Particle Flux Spectra and Residual Activimentioning

confidence: 99%

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Research activities on JASMIN: Japanese and American Study of Muon Interaction and Neutron detection

Nakashima

Matsumura

Mokhov

et al. 2014

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In order to investigate the accuracy of high-energy radiation transport codes based on experimental data, the collaboration; Japanese and American Study of Muon Interaction and Neutron detection (JASMIN), has been formed among many institutions and universities of Japan and U.S.A. A series of experiments have been conducted at the Fermilab Pbar target station, the NuMI beam line and the Fermilab Test Beam Facility (FTBF). In this paper the research activities are reviewed.

“…One the other hand Monte Carlo calculation code system, such as MCNP and PHITS, are widely used for the shielding calculation of complex geometry. In the case of clean geometry, relatively complete data are now available, but there is only a few benchmark data in the complex geometry [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Measurement and analysis of neutron and photon dose rate in concrete shield of 120-GeV proton accelerator facility

Oishi¹,

Kosako²,

Kasugai³

2014

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The dose rate measurements of neutrons and photons by using dosimeter (Quixel badge) have been performed in the concrete shield at the 120 GeV anti-proton production facility (AP0) in Fermi National Accelerator Laboratory. The concrete shield was established backward of 183 cm thick iron shield. The thickness of the concrete shield was 122 cm. The dosimeters were set in the concrete shield at 0, 15, 30, 45, 60, 90 and 120 cm from the front surface. The proton beam intensities varied from 2.40x10 12 to 5.18x10 17 (protons/sec) according to the sensitiveness of the dosimeters. The calculations of dose rate in the concrete shield have also been performed by using PHITS-2.24 calculation code with its related cross section library JENDL3.3. From the comparisons between measured and calculated results, good agreements within factor 2 were obtained in the case of photons. However, some disagreements were observed in the case of neutrons, especially near the front surface up to 15 cm. These discrepancies might be caused by the estimation of neutron dose rate and/or detector resolution around 100 keV.