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Dragon-I device photoexcited neutron source for neutron resonance temperature feasibility study

Author: XiangYanJun
Tutor: MaJingFang
School: Chinese Academy of Engineering Physics
Course: Nuclear Technology and Applications
Keywords: Neutron resonance temperature Dragon-I MC simulations Feasibility study MCNP5 FLUKA
CLC: O571.53
Type: Master's thesis
Year: 2009
Downloads: 70
Quote: 0
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Abstract


Neutron resonance temperature compared with conventional temperature measurement technique has many advantages. Because of its short-term response and a strong penetrating neutrons can be used to measure the temperature shock. But there is no domestic high-intensity white light neutron source, no study neutron resonance thermometry. Dragon-I device is used for the study of neutron resonance temperature feasibility, we use mc simulation software fluka and mcnp5, some work to do the following: First, according to Dragon-accelerated electron beam device characteristics and uses firmware Bremsstrahlung laminated tantalum target, the calculated optical devices currently Dragon-neutron yield was 1.34 × 10 11 per electron pulse (mcnp5) and 1.55 × 10 11 Each electronic pulses (fluka), a continuous spectral distribution, the peak occurring between 0.1 ~ 1MeV; pulse width of 85ns; angularly substantially isotropic distribution. Second, the calculation of the different materials in the Dragon-irradiation target device characteristics under electron beam neutron yield, both in 10 12 order of magnitude, to get natural uranium and natural thorium metal target neutron yield than other materials, which yield the highest amount of natural uranium. Uranium target neutron yield increases with the thickness at about 8cm saturated, up to 7.47 × 10 12 per electron pulse. Third, calculate the beryllium, heavy water moderator and paraffin three kinds of light of the results of slow neutrons, the tantalum target obtained laminate slowing light generated neutrons 1eV ~ 100eV between the maximum intensity neutron moderator thickness of 10 ~ 12cm, 12 ~ 16cm and 2 ~ 2.5cm, the slowing pulse broadening due to the sub-microseconds to milliseconds levels, the wax causes broadening of pulse time than the other two an order of magnitude. Uranium targets on the best neutron moderator optical thickness of 2.5 ~ 3cm. Fourth, calculate the stack and 7cm thick tantalum target light generated neutrons uranium targets through optimum thickness of paraffin moderator after passing through 1cm thick tungsten film transmission spectra can be observed 182 W's 21.06eV formant. Calculated at 5m from the target transmission spectrum Show: laminated tantalum target transmission spectrum in the vicinity of the resonance peak count of a few to tens n * cm -2 * μ s-1 , is difficult to measure experimentally formant: transmission spectrum of uranium targets in the vicinity of the resonance peak count is 5 ~ 6 × 10 2 n * cm -2 * μ s-1 , can be experimentally measured resonance peak. Fifth, according to the Los Alamos shock temperature measuring device, computing Dragon-7cm uranium target device using the light generated neutrons through paraffin moderator 3cm by Mo sample after transmission spectra can be observed 182 W's 21.06eV resonance peak and its broadening trend, at a distance of 5m at the target count is also higher than Los Alamos situation. Sixth, in order to verify the calculated results, experimental measurements of the light generated by Dragon-I device neutron yield, calculated results show that yield approximately 10 12 one each electrical pulse, and calculation results are consistent with . Based on the above calculation and experiments have proved Dragon-uranium target device using 7cm, with optimum moderation, the resonance can be used for temperature measurement of the neutron.

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CLC: > Mathematical sciences and chemical > Physics > Nuclear physics,high energy physics > Nuclear physics > Neutron physics > Neutron source and neutron detector
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