Email alert
RSS2019 Vol. 31, No. 1
Display Method:
2019,
31: 1-2.
2019,
31: 012001.
doi: 10.11884/HPLPB201931.180261
Abstract:
The material selected for the experiment is the high power pulsed Xenon lamp rare earth tungsten electrode after operation. Analysis of appearance, element distribution and elemental valence of rare earth tungsten electrode surface and etched at different depths. Experimental results show that: After the work, there were many cracks on the surface of the electrode and ablation pits. The elements on the surface were evenly distributed and consisted of three elements: W, La, and O.The electrode surface La exists in the form of La3+, W has two valence states W0 and W6+, where W6+ accounts for the majority; After the ion etching, the valencestate of La is still La3+, W still has two types of W0 and W6+, but W0 accounts for the most; After the etching depth increases, the valence state of tungsten becomes W0.
The material selected for the experiment is the high power pulsed Xenon lamp rare earth tungsten electrode after operation. Analysis of appearance, element distribution and elemental valence of rare earth tungsten electrode surface and etched at different depths. Experimental results show that: After the work, there were many cracks on the surface of the electrode and ablation pits. The elements on the surface were evenly distributed and consisted of three elements: W, La, and O.The electrode surface La exists in the form of La3+, W has two valence states W0 and W6+, where W6+ accounts for the majority; After the ion etching, the valencestate of La is still La3+, W still has two types of W0 and W6+, but W0 accounts for the most; After the etching depth increases, the valence state of tungsten becomes W0.
2019,
31: 012002.
doi: 10.11884/HPLPB201931.180219
Abstract:
The power conditioning system (PCS) which provides matched pulse energy for amplifier is a subsystem of a solid-state laser facility. Some catastrophic faults such as capacitor internal short-circuit, bus bar breakdown to ground or high voltage cable short, may occur in the PCS due to the process of charging and discharging which involves high voltage and huge current. To analyze these cases, firstly, the models of the PCS and three main faults are proposed. Secondly, the nonlinear effect of xenon lamp for system model is analyzed based on simulation results and a fixed model with compensation parameter is presented, the experiment results has verified the effectiveness of the fixed model. At last, the tolerance and safety of key components such as damping inductors, capacitors, ballast inductors, are analyzed when faults happened. As a result, the proposed model provides some necessary support for parameter design and fault protect of PCS.
The power conditioning system (PCS) which provides matched pulse energy for amplifier is a subsystem of a solid-state laser facility. Some catastrophic faults such as capacitor internal short-circuit, bus bar breakdown to ground or high voltage cable short, may occur in the PCS due to the process of charging and discharging which involves high voltage and huge current. To analyze these cases, firstly, the models of the PCS and three main faults are proposed. Secondly, the nonlinear effect of xenon lamp for system model is analyzed based on simulation results and a fixed model with compensation parameter is presented, the experiment results has verified the effectiveness of the fixed model. At last, the tolerance and safety of key components such as damping inductors, capacitors, ballast inductors, are analyzed when faults happened. As a result, the proposed model provides some necessary support for parameter design and fault protect of PCS.
2019,
31: 012003.
doi: 10.11884/HPLPB201931.180060
Abstract:
In order to increase the magnetic levitation force of Inertial Confinement Fusion (ICF) glass target pellets, the temperature control accuracy of heat treatment is required to be very high by means of crystal state regulation of metal oxide coating on the surface of the glass target pellets through heat treatment process so as to enhance the magnetic properties.At present, the temperature measurement method based on circular graph recorder cannot satisfy the requirement of ICF when analyzing the heat treatment temperature in real time and multimodal. This paper proposes multimodal reconstruction method for precision heat treatment temperature measurement. First, the process temperature data is digitalized and transferred, and then reconstructed and multi-modally analyzed in the computer, finally based on spatial topological relations and characteristic parameters calibration results, using Corexy mechanism to realize multimodal reconstruction of heat treatment temperature. The results show that the proposed method can realize the single mode separation and multimodal reconstruction of the temperature control process, and the implementation error is generally less than 5%.This method can provide abundant heat treatment temperature data for precise physics experiments.
In order to increase the magnetic levitation force of Inertial Confinement Fusion (ICF) glass target pellets, the temperature control accuracy of heat treatment is required to be very high by means of crystal state regulation of metal oxide coating on the surface of the glass target pellets through heat treatment process so as to enhance the magnetic properties.At present, the temperature measurement method based on circular graph recorder cannot satisfy the requirement of ICF when analyzing the heat treatment temperature in real time and multimodal. This paper proposes multimodal reconstruction method for precision heat treatment temperature measurement. First, the process temperature data is digitalized and transferred, and then reconstructed and multi-modally analyzed in the computer, finally based on spatial topological relations and characteristic parameters calibration results, using Corexy mechanism to realize multimodal reconstruction of heat treatment temperature. The results show that the proposed method can realize the single mode separation and multimodal reconstruction of the temperature control process, and the implementation error is generally less than 5%.This method can provide abundant heat treatment temperature data for precise physics experiments.
2019,
31: 013001.
doi: 10.11884/HPLPB201931.180095
Abstract:
First the geometrical factor is derived, then the integrodifferential equation of the instantaneous current and the beam kinetic energy is given, and the coupling coefficient of the gap of the coaxial cavity is obtained. With electron beam voltage of 600 kV, electron beam of 5 kA, and the gap voltage of the input cavity of 4.6, 32.7, 189 kV, and the number of the multi beam of 16, the fundamental harmonic current modulation coefficient versus distance z is calculated by the three dimensional particle-in-cell (PIC) simulation and the code of nonlinear theory respectively, the result of the theory and that of the simulation agree remarkably well. With gap voltage of 4.6 kV, the number of the multi beam of 8, 12, 16, and the ratio of the radius of solid beam and the channel of single electron beam of 6/15, 8/15, 10/15, the fundamental harmonic current modulation coefficient versus distance z is calculated by the code of nonlinear theory. With gap voltage of 4.6 kV, the fundamental harmonic current modulation coefficient and the kinetic versus the normalized time θ is calculated, normalization constant N(z) and the n-th harmonic current modulation coefficient Cn (n=1, 2, 4) versus distance z are calculated.
First the geometrical factor is derived, then the integrodifferential equation of the instantaneous current and the beam kinetic energy is given, and the coupling coefficient of the gap of the coaxial cavity is obtained. With electron beam voltage of 600 kV, electron beam of 5 kA, and the gap voltage of the input cavity of 4.6, 32.7, 189 kV, and the number of the multi beam of 16, the fundamental harmonic current modulation coefficient versus distance z is calculated by the three dimensional particle-in-cell (PIC) simulation and the code of nonlinear theory respectively, the result of the theory and that of the simulation agree remarkably well. With gap voltage of 4.6 kV, the number of the multi beam of 8, 12, 16, and the ratio of the radius of solid beam and the channel of single electron beam of 6/15, 8/15, 10/15, the fundamental harmonic current modulation coefficient versus distance z is calculated by the code of nonlinear theory. With gap voltage of 4.6 kV, the fundamental harmonic current modulation coefficient and the kinetic versus the normalized time θ is calculated, normalization constant N(z) and the n-th harmonic current modulation coefficient Cn (n=1, 2, 4) versus distance z are calculated.
2019,
31: 013002.
doi: 10.11884/HPLPB201931.180214
Abstract:
This paper presents a compact wideband high power microwave source developed on the basis of a switched oscillator. To improve the operating voltage of the switched oscillator, it was filled with transformer oil for insulation. Furthermore, an electric-magnetic combined dipole antenna with relatively small physical dimensions and forward radiation pattern was employed as the radiating antenna. In the design stage, the performance of the switched oscillator and the radiating antenna was predicted by electromagnetic simulation. Then this wideband high power microwave source was tested in experiments and the radiated electric field was measured. As a result, the operating voltage of the switched oscillator exceeded 300 kV, while the radiation factor reached up to 125 kV and the central oscillating frequency was 375 MHz with a 3 dB bandwidth of 24%.
This paper presents a compact wideband high power microwave source developed on the basis of a switched oscillator. To improve the operating voltage of the switched oscillator, it was filled with transformer oil for insulation. Furthermore, an electric-magnetic combined dipole antenna with relatively small physical dimensions and forward radiation pattern was employed as the radiating antenna. In the design stage, the performance of the switched oscillator and the radiating antenna was predicted by electromagnetic simulation. Then this wideband high power microwave source was tested in experiments and the radiated electric field was measured. As a result, the operating voltage of the switched oscillator exceeded 300 kV, while the radiation factor reached up to 125 kV and the central oscillating frequency was 375 MHz with a 3 dB bandwidth of 24%.
2019,
31: 013201.
doi: 10.11884/HPLPB201931.180252
Abstract:
To promote the application of quadrupole electromagnetic orbital launcher in ground-to-air missile launching, the interference structure of quadrupole armature was studied. On the basis of finite element software ANSYS Workbench and its 3D interference fit simulation, with four evaluation indexes-maximum equivalent stress, coefficient of contact area, uniformity coefficient of contact pressure and coefficient of relative contact pressure-selected to describe the contact characteristics, the four interference structure parameters of quadrupole armature (interference amount and length, tail width and thickness) were optimized comprehensively by orthogonal experiment. The results show that the optimal combination of 2 mm interference amount, 140 mm tail width, 40 mm tail thickness and 270 mm interference length can make the contact characteristics between armature and rail ideal in the early stage of launch, which can be used as a reference for the design of quadrupole armature structure.
To promote the application of quadrupole electromagnetic orbital launcher in ground-to-air missile launching, the interference structure of quadrupole armature was studied. On the basis of finite element software ANSYS Workbench and its 3D interference fit simulation, with four evaluation indexes-maximum equivalent stress, coefficient of contact area, uniformity coefficient of contact pressure and coefficient of relative contact pressure-selected to describe the contact characteristics, the four interference structure parameters of quadrupole armature (interference amount and length, tail width and thickness) were optimized comprehensively by orthogonal experiment. The results show that the optimal combination of 2 mm interference amount, 140 mm tail width, 40 mm tail thickness and 270 mm interference length can make the contact characteristics between armature and rail ideal in the early stage of launch, which can be used as a reference for the design of quadrupole armature structure.
2019,
31: 014001.
doi: 10.11884/HPLPB201931.180188
Abstract:
Acceleration of electrons or charged particles by a linearly polarized electromagnetic wave (LPEMW) propagating in a medium along an external magnetic field is theoretically studied. We have investigated three acceleration cases here: (Ⅰ) the medium's refractive index changes with location but the external magnetic field is constant, (Ⅱ) the medium's refractive index is constant but the external magnetic field increases with the distance in the wave propagation direction, and (Ⅲ) both the medium's refractive index and the external magnetic field change with the distance. The results show that the most efficient (i.e., at a fixed acceleration distance, obtaining the highest relativistic factor) electron acceleration by the LPEMW can be fulfilled in case (Ⅲ). Besides, in case (Ⅲ), the drawback (such as charged particles' going backward for a while) in the acceleration of case (Ⅱ) can be avoided or greatly reduced, which is very important for acceleration of a bunch of electrons or charged particles by LPEMW. It is believed that the acceleration mechanism found in case (Ⅲ) can be helpful in the design of a compact and efficient chargedparticle accelerator.
Acceleration of electrons or charged particles by a linearly polarized electromagnetic wave (LPEMW) propagating in a medium along an external magnetic field is theoretically studied. We have investigated three acceleration cases here: (Ⅰ) the medium's refractive index changes with location but the external magnetic field is constant, (Ⅱ) the medium's refractive index is constant but the external magnetic field increases with the distance in the wave propagation direction, and (Ⅲ) both the medium's refractive index and the external magnetic field change with the distance. The results show that the most efficient (i.e., at a fixed acceleration distance, obtaining the highest relativistic factor) electron acceleration by the LPEMW can be fulfilled in case (Ⅲ). Besides, in case (Ⅲ), the drawback (such as charged particles' going backward for a while) in the acceleration of case (Ⅱ) can be avoided or greatly reduced, which is very important for acceleration of a bunch of electrons or charged particles by LPEMW. It is believed that the acceleration mechanism found in case (Ⅲ) can be helpful in the design of a compact and efficient chargedparticle accelerator.
2019,
31: 014101.
doi: 10.11884/HPLPB201931.180227
Abstract:
Pass-band filter based on a tunable cavity is designed in 2-dimentional square-lattice photonic crystal structure. Operational transmission bands of the waveguide and cavity system are adjusted by changing positions of tuning dielectric rods beside the 1×5 resonant cavity. The effects of input port coupling decay ratio and input port detuning factors on the filter are analyzed by using CMT(Coupled-Mode Theory). Wavelength transmission spectra of the filter are calculated with the help of FDTD (finite difference time domain) method. The results show that -3 dB band width Δλ of output 38 pass-bands ranges from 4.18 nm to 11.15 nm when the filter operates over 1320-1810 nm wavelength band. Pass-band peak wavelength tuning width of the proposed structure is 186.56 nm. The micro filter is suitable for optical telecommunication course Wavelength Division Demultiplexing(WDDM) system design and optical integration design etc.
Pass-band filter based on a tunable cavity is designed in 2-dimentional square-lattice photonic crystal structure. Operational transmission bands of the waveguide and cavity system are adjusted by changing positions of tuning dielectric rods beside the 1×5 resonant cavity. The effects of input port coupling decay ratio and input port detuning factors on the filter are analyzed by using CMT(Coupled-Mode Theory). Wavelength transmission spectra of the filter are calculated with the help of FDTD (finite difference time domain) method. The results show that -3 dB band width Δλ of output 38 pass-bands ranges from 4.18 nm to 11.15 nm when the filter operates over 1320-1810 nm wavelength band. Pass-band peak wavelength tuning width of the proposed structure is 186.56 nm. The micro filter is suitable for optical telecommunication course Wavelength Division Demultiplexing(WDDM) system design and optical integration design etc.
2019,
31: 015001.
doi: 10.11884/HPLPB201931.180256
Abstract:
The influence of the laser-triggered gas switches' closing time on the peak value and rise time of Z-pinch load current in PTS facility was simulated by a code called FCM-PTS coupled with snow-plow model for the load. It was found that although the one-way transit time difference of triplate transmission lines between top branches and bottom branches was 20 ns, the best time difference of the laser-triggered gas switches' closing time between top branches and bottom branches was 22 ns, which maximized the peak value and minimized the rise time of the load current. When the time difference of the laser-triggered gas switches' closing time was set to 20 ns and 22 ns, 10 ns jitter in the laser-triggered gas switches' closing time could decrease the peak value by up to 163 kA and 136 kA, and increase the rise time by up to 2.4 ns and 2.9 ns, respectively.
The influence of the laser-triggered gas switches' closing time on the peak value and rise time of Z-pinch load current in PTS facility was simulated by a code called FCM-PTS coupled with snow-plow model for the load. It was found that although the one-way transit time difference of triplate transmission lines between top branches and bottom branches was 20 ns, the best time difference of the laser-triggered gas switches' closing time between top branches and bottom branches was 22 ns, which maximized the peak value and minimized the rise time of the load current. When the time difference of the laser-triggered gas switches' closing time was set to 20 ns and 22 ns, 10 ns jitter in the laser-triggered gas switches' closing time could decrease the peak value by up to 163 kA and 136 kA, and increase the rise time by up to 2.4 ns and 2.9 ns, respectively.
2019,
31: 015002.
doi: 10.11884/HPLPB201931.180280
Abstract:
A hybrid control method which integrates charge and frequency control methods is adopted based on half-bridge LLC resonant converter. Compared with the current control methods such as charge-type control, dual-frequency control, average current-mode control, PWM-PFM hybrid control and PLL control, this control method can improve the energy transmission efficiency, increase the frequency compensation slope, make the compensator design very simple, improve the transient performance of the line and reduce output capacitor value. According to the equivalent circuit of half-bridge LLC resonant converter obtained by fundamental wave analysis method, the relationship between DC gain and quality factor, normalized frequency resonance and the ratio of inductance to excitation inductance is determined, and appropriate resonant device parameters are designed. A 5 kW/±85 V half-bridge LLC resonant converter is built according to the hybrid control method and the designed LC resonant parameters. The experimental results show that the prototype has good dynamic characteristics and can obtain stable output voltage and high transmission efficiency. The feasibility of the control method and the design of LLC resonant parameters is verified.
A hybrid control method which integrates charge and frequency control methods is adopted based on half-bridge LLC resonant converter. Compared with the current control methods such as charge-type control, dual-frequency control, average current-mode control, PWM-PFM hybrid control and PLL control, this control method can improve the energy transmission efficiency, increase the frequency compensation slope, make the compensator design very simple, improve the transient performance of the line and reduce output capacitor value. According to the equivalent circuit of half-bridge LLC resonant converter obtained by fundamental wave analysis method, the relationship between DC gain and quality factor, normalized frequency resonance and the ratio of inductance to excitation inductance is determined, and appropriate resonant device parameters are designed. A 5 kW/±85 V half-bridge LLC resonant converter is built according to the hybrid control method and the designed LC resonant parameters. The experimental results show that the prototype has good dynamic characteristics and can obtain stable output voltage and high transmission efficiency. The feasibility of the control method and the design of LLC resonant parameters is verified.
2019,
31: 015003.
doi: 10.11884/HPLPB201931.180273
Abstract:
A kind of planar S-type folded solid-state pulse forming line is designed using FR-4 epoxy glass fiber cloth as the dielectric material. The discharge process of the pulse forming line is analyzed theoretically and experimentally. The margin effect on its characteristic impedance is studied, and the modified characteristic impedance expression is given. The neighboring and skin effects on the pulse formation are also analyzed, which induce a super-imposition of high frequency noise on the original signal. The dependence of lifetime on the applied electric field is verified. Series-parallel and modular technology of multistage folded line is used to increase the withstanding voltage and reduce its characteristic impedance. A Blumlein line module based on series-parallel technology is designed, whose withstanding voltage of the module is greater than 120 kV, the characteristic impedance is about 7 Ω, and the pulse width is 138 ns.
A kind of planar S-type folded solid-state pulse forming line is designed using FR-4 epoxy glass fiber cloth as the dielectric material. The discharge process of the pulse forming line is analyzed theoretically and experimentally. The margin effect on its characteristic impedance is studied, and the modified characteristic impedance expression is given. The neighboring and skin effects on the pulse formation are also analyzed, which induce a super-imposition of high frequency noise on the original signal. The dependence of lifetime on the applied electric field is verified. Series-parallel and modular technology of multistage folded line is used to increase the withstanding voltage and reduce its characteristic impedance. A Blumlein line module based on series-parallel technology is designed, whose withstanding voltage of the module is greater than 120 kV, the characteristic impedance is about 7 Ω, and the pulse width is 138 ns.
2019,
31: 015004.
doi: 10.11884/HPLPB201931.180309
Abstract:
In view of the uneven distribution of magnetic field in the devices caused by the metal surface eddy current in the high-current pulse electron beam diode, the surface treatment effect of the electron beam irradiated material is not good, and the double structure design of the multi plate steel connecting inner wall with the glass outer wall is proposed. Based on the finite element simulation software, the magnetic field and eddy current of the electron beam system are numerically calculated. The influence factors of the eddy current and the influence of the eddy current on the magnetic field of the electron beam source are analyzed. The result shows that the design of the new dielectric wall structure can effectively reduce the effect of eddy current on the electron beam. The analysis provides a theoretical basis for eliminating the influence of induction eddy current on the magnetic field of diode.
In view of the uneven distribution of magnetic field in the devices caused by the metal surface eddy current in the high-current pulse electron beam diode, the surface treatment effect of the electron beam irradiated material is not good, and the double structure design of the multi plate steel connecting inner wall with the glass outer wall is proposed. Based on the finite element simulation software, the magnetic field and eddy current of the electron beam system are numerically calculated. The influence factors of the eddy current and the influence of the eddy current on the magnetic field of the electron beam source are analyzed. The result shows that the design of the new dielectric wall structure can effectively reduce the effect of eddy current on the electron beam. The analysis provides a theoretical basis for eliminating the influence of induction eddy current on the magnetic field of diode.
2019,
31: 015101.
doi: 10.11884/HPLPB201931.180234
Abstract:
Dragon-Ⅱ is a linear induction accelerator, which can produce up to three bremsstrahlung X-ray pulses. Each X-ray pulse width is about 80 ns(FWHM), and time interval between pulses is about 500 ns. Each pulse X-ray dose is a critical parameter for Dragon-Ⅱ. Compton detector, combined with thermo luminescent dosemeter(TLD), was used to measure X-ray dose per pulse. MCNP program was used to design a Compton detector according to the characteristic of bremsstrahlung produced by Dragon-Ⅱ accelerator. Compton detector can measure multi-pulse X-ray signal and one pulse X-ray signal's integral is proportional to each pulse X-ray dose, and according to the total dose of three pulse X-ray obtained from TLD, each pulse X-ray dose can be obtained accurately.
Dragon-Ⅱ is a linear induction accelerator, which can produce up to three bremsstrahlung X-ray pulses. Each X-ray pulse width is about 80 ns(FWHM), and time interval between pulses is about 500 ns. Each pulse X-ray dose is a critical parameter for Dragon-Ⅱ. Compton detector, combined with thermo luminescent dosemeter(TLD), was used to measure X-ray dose per pulse. MCNP program was used to design a Compton detector according to the characteristic of bremsstrahlung produced by Dragon-Ⅱ accelerator. Compton detector can measure multi-pulse X-ray signal and one pulse X-ray signal's integral is proportional to each pulse X-ray dose, and according to the total dose of three pulse X-ray obtained from TLD, each pulse X-ray dose can be obtained accurately.
2019,
31: 015102.
doi: 10.11884/HPLPB201931.180198
Abstract:
China Spallation Neutron Source (CSNS), as a high power proton accelerator, is designed to control the beam loss strictly, and the beam loss measurement system is very important for accelerator equipment protection, residual activator control and accelerator machine debugging. This paper analyzes the selection of detectors, analyzes the functions of preamplifier, introduces the hardware configuration of data acquisition system, the interface of local station and central control room, and emphatically introduces the application of this system in the beam debugging of different energy segments of accelerators.
China Spallation Neutron Source (CSNS), as a high power proton accelerator, is designed to control the beam loss strictly, and the beam loss measurement system is very important for accelerator equipment protection, residual activator control and accelerator machine debugging. This paper analyzes the selection of detectors, analyzes the functions of preamplifier, introduces the hardware configuration of data acquisition system, the interface of local station and central control room, and emphatically introduces the application of this system in the beam debugging of different energy segments of accelerators.
2019,
31: 016001.
doi: 10.11884/HPLPB201931.180197
Abstract:
This paper presents the design of a new low-gas-pressure gas switch that uses an external particle source for generating the original ionized particles, using Geant4 program to build the physical model of the switch. Verification shows that the model is reliable and effective. The model is adopted to calculate the effect of gas species and gas pressure on electron gain, get the minimum injected-electron number for forming self-sustained discharge. The simulation results show that the electron gain of nitrogen is considerably larger than that of helium, which is in accordance with the higher ionization energy of helium. The electron gain increases with increasing gas pressure in the form of nonlinear growth. To form self-sustained discharge, the density of injected-electron is (1-2)×105/cm2.
This paper presents the design of a new low-gas-pressure gas switch that uses an external particle source for generating the original ionized particles, using Geant4 program to build the physical model of the switch. Verification shows that the model is reliable and effective. The model is adopted to calculate the effect of gas species and gas pressure on electron gain, get the minimum injected-electron number for forming self-sustained discharge. The simulation results show that the electron gain of nitrogen is considerably larger than that of helium, which is in accordance with the higher ionization energy of helium. The electron gain increases with increasing gas pressure in the form of nonlinear growth. To form self-sustained discharge, the density of injected-electron is (1-2)×105/cm2.
2019,
31: 019001.
doi: 10.11884/HPLPB201931.180364
Abstract:
In order to explore the enhancement effect of collinear dual-pulse excitation on the spectral intensity of Pb and Ba elements in soil, the variations of spectral intensity with the acquisition delay time and spectral enhancement times with the time interval of dual-pulses under the three excitation modes of 1064 nm single pulse, (355 nm+1064 nm) and (1064 nm+355 nm) collinear dual-pulses were studied. The results show that, compared to a single 1064 nm pulse, maximum enhancements by times of 5 for the Pb I 405.78 nm and 8 for the Ba I 553.55 nm were observed under the mode of dual-pulses. The results provide a reference for the detection of heavy metals in soil.
In order to explore the enhancement effect of collinear dual-pulse excitation on the spectral intensity of Pb and Ba elements in soil, the variations of spectral intensity with the acquisition delay time and spectral enhancement times with the time interval of dual-pulses under the three excitation modes of 1064 nm single pulse, (355 nm+1064 nm) and (1064 nm+355 nm) collinear dual-pulses were studied. The results show that, compared to a single 1064 nm pulse, maximum enhancements by times of 5 for the Pb I 405.78 nm and 8 for the Ba I 553.55 nm were observed under the mode of dual-pulses. The results provide a reference for the detection of heavy metals in soil.
2019,
31: 019002.
doi: 10.11884/HPLPB201931.180293
Abstract:
A new topaz color-alteration device suitable for reactors with plate fuel is developed. The physical and structural safety features have been analyzed. With porous medium model in CFD, the flow and temperature field were got, also the factor limiting the reactor operating power. The device improvement of enhancing the function material cladding's cooling capacity were done. The results shows that the color-alteration experiment could be done at rated power after device improvement. The hydrodynamic characteristic experiment and CFD simulation data by the operation differential pressure were compared, with -3.6%-1.9% difference. The device washing test shows good ability to collect topaz residue, and the flow channel blockage is avoided.
A new topaz color-alteration device suitable for reactors with plate fuel is developed. The physical and structural safety features have been analyzed. With porous medium model in CFD, the flow and temperature field were got, also the factor limiting the reactor operating power. The device improvement of enhancing the function material cladding's cooling capacity were done. The results shows that the color-alteration experiment could be done at rated power after device improvement. The hydrodynamic characteristic experiment and CFD simulation data by the operation differential pressure were compared, with -3.6%-1.9% difference. The device washing test shows good ability to collect topaz residue, and the flow channel blockage is avoided.
