Synthesis of a New Amide-type Extractant

Recently, amide-type extractant is widely used for the separation of the lanthanide ion and actinide ion because of its excellent extraction capability. Tripodal ligand is a semi-rigid compound of which three side-chain could rotate freely to adapt differ…     

Synthesis of a New Amide-type Extractant

在加速器研制中，磁控管、闸流管、速调管及电子枪的灯丝都需提供稳定电压，同时电压能从零加起，缓慢上升到规定电压，不能出现突然加电情况。     

Intensification of interphase mass transfer as a result of radiolysis of liquid-phase components at a gas–liquid interface

The influence of ionizing radiation on interphase transport of noncondensing gases in a liquid water–vapor-gas mixture system is investigated. A mathematical model is developed and computational experiments are performed for the irradiation of water in equilibrium with vapor, in a closed vessel with a free volume in the absence of mixing of the phases and intense heat transfer, and irradiation of a moving liquid in the bubble flow regime. It is shown that when a liquid water–vapor-gas mixture two-phase system is exposed to ionizing radiation the transition of the mixture of hydrogen and oxygen from the vapor-gas phase into the liquid phase becomes more intense. The reason for this is that they undergo an effective radiation-chemical reaction in a layer adjoining the surface separating the phases. This effect is useful for developing a water-chemical regime for future and currently operating nuclear power facilities. Translated from Atomnaya énergiya, Vol. 105, No. 6, pp. 319–322, December, 2008.     

Design of a Rogowski Coil with a Magnetic Core Used for Measurements of Nanosecond Current Pulses

A Rogowski coil is developed to detect the nanosecond pulse signals of the discharge current with a wide bandwidth of 800 kHz to 106 MHz and high sensitivity of 2.22 V/A. Performance tests show that the Rogowski coil has both excellent dynamic and static characteristics. Calibrating results and the comparison between the standard current shunt and the developed Rogowski coil for the measurement of nanosecond discharge pulses demonstrate that the developed Rogowski coil can reproduce the actual waveform of the discharge current accurately.     

Development of a γ-ray Measurement System of Radioactive Wastes

According to the criteria of radioactive wastes, intermediate and low-level radioactive solid waste produced in nuclear fuel recycle must be characterized for near surface disposed. For this purpose, a     

Study of the Parameters of a Magnetic DC Plasma Jet

1.IntroductionPlasmajetcanberegardedasafunctionalfluid,becauseithashighenthalPy,chemicalreactivityandfurtherthermodynadricchararteristiCs.Ithas,there-fore,beenfrequentlyutilizedinthemetallurgicalandchemicalprocessessuchaswelding,cutting,solidwasteprocessingandplasmadeposition,andfurtherinthepropulsionorcontrollingsystemforspacevehi-cleandaJsoMagneto-Hydro-Dynawhcgenerator[1].lntheseprocessesandenergyconversionsystems,itisveryimportanttocontrolprecisely,notonlythethermChfluidcharacteristicsof…     

Development of a Set of Neutron Kinetics Codes for CEFR

The function of some neutron kinetics analysis codes now used in CEFR is quite simple, which do     

Development of a γ-ray Measurement System of Radioactive Wastes

According to the criteria of radioactive wastes, intermediate and low-level radioactive solid waste produced in nuclear fuel recycle must be characterized for near surface disposed. For this purpose, a special y-ray measuring system used for classifying low or medium-density drummed radioactive wastes was developed. The system consists of three sets of high purity germanium detectors with multi-channel analyzers. When the system works, waste drums rotate on axial and divided into three segments on radial.     

Monte-Carlo Calculation of the γ-Ray Dose Distribution Inside a Wall of a Building and in Air

The Monte Carlo method is used to calculate the coefficients used to convert from the measured (using retrospective luminescence dosimetry) -ray dose inside the wall of a building to the dose in air. The -ray dose distributions in the wall and in air were calculated simultaneously. The calculations were performed for a -ray sources located in air, on the surface of soil, and in a 0–5 cm thick top layer of soil. The -ray spectra in air and inside a wall are calculated and it is shown that the spectrum depends strongly on the type of source – the average energy of the spectrum is 0.25 MeV for a source located on a soil surface, 0.39 MeV for a source located inside the soil, and 0.53 MeV for a source located in air.     

Establishment of a Cluster Physics Research Device

Carbon cluster beam of MeV C_2-C_4 has been successfully accelerated on HI-13 tandem accelerator,researches of interaction between these particles and plastic track detector CR-39 has been lead out. Sincethe mass energy product of analysis magnet on HI-13 tandem accelerator is 200 MeV·Amu, only lowenergy C_2-C_4 cluster beam could be deflected and analyzed in the experimental hall. In order to obtainhigher energy C_2-C_4 or bigger clusters as well as other types of clusters (such as Si_n and Au_n, etc.), a beam     

Design of a New Type of Stub Tuner in ICRF Experiment

In the Ion Cyclotron Range of Frequency(ICRF) heating experiment,impedance matching is of great practical significance,because wide variations in antenna loading are observed within the discharge,in tokamaks operating in H-mode.A sudden decrease in antenna loading accompanying the L-mode to H-mode transition typically occurs on a timescale of a few millisec onds,as does the increase in loading at the H- to L-mode transition.Therefore,it is necessary to match dynamically in the transmission line between the generator output and the antenna input connections[1].A new type of stub tuner being developed utilizes the difference in radio-frequency wavelengths between gas and liquid due to different relative dielectric constants.The impedance matching can be adjusted in realtime in an attempt to track the variations in the antenna loading.Since there are no mechanically moving parts in the short ends of stub,the change can be more convenient and safe,moreover,it can withstand higher voltage without breakdown.this system device will be applied in the HT-7 superconductor Tokamak ICRF experiment.     

Development of a Modual Radiological Portal Monitor

Radiological portal monitor is used to detect gamma rays and neutron for personal and vehicle. It can be installed at the access of the nuclear facility, airport, custom, railway station and other important place.     

Rebuilding of the UHV System of a 10 MeV Electron Linac

A 10 MeV electron linac with the beam power of 15 kW was developed for the irradiation of food. The main goal of the vacuum system is to maintain a mean pressure of 5×10-6 Pa. The pumping system was rebuilt in order to improve the vacuum system. Three of…     

Rebuilding of the UHV System of a 10 MeV Electron Linac

The virtual installation and the virtual control become more and more important in accelerator design. By using the design software, we can achieve virtual design and installation quickly and easily.     

The magnetic field design of a solenoid for the cold-cathode Penning ion source of a miniature neutron tube

A high-yield and beam-stable neutron tube can be applied in many fields. It is of great significance to the optimal external magnetic field intensity of the cold-cathode Penning ion source(PIS) and precisely controls the movement of deuterium(D), tritium(T) ions and electrons in the source of the neutron tubes. A cold-cathode PIS is designed based on the solenoidal magnetic field to obtain better uniformity of the magnetic field and higher yield of the neutron tube. The degree of magnetic field ...     

Characterization of a 3-Phase a.c. Free Burning Arc Plasma

A 3-phase a.c. arc plasma reactor with large volume plasma has been developed for the synthesis of new carbon nano-structures. One of the main characteristics of the plasma system is related to the absence of a fixed neutral point. This gives rise to a rich and complex phenomenology related to instabilities and arc motion since the arcs are ＂burning＂ freely in the gas flow between the three electrodes. This paper is dedicated to the analysis of the behavior of such a system under typical conditions using argon and nitrogen as plasma gases. A classification of are configuration, arc commutating, arc interaction, arc motion and arc instabilities are discussed based on ultra high-speed cine camera analysis. A simple model describing the time evolution of the system is also presented and compared with the experimental measurements. The results show that an adequate control could allow the improvement of the overall system.