[en] Operation principle, design principle, fabrication and cautions in operation of ultrahigh pressure He booster system are introduced, and main parts selection method and high pressure seal design of the booster system are discussed. The as-developed system can output 300 MPa helium gas with (3.5 ∼ 5.0) x 10^-7 Pa · m³/s leak rate through manual or automatic pressure boosting and keeping. Main function parameters of the system are accessed and compared with those of three congeneric systems. The result shows that the system was rationally designed with superior performance and safety, and the system would be used to test ICF microsphere filling DT system. (authors)

[en] The penetrating performance of D₂ in plastic microspheres was studied. The compressive strength and the permeability coefficients of plastic microspheres were obtained by filling D₂ with different pressures in hollow plastic microspheres at 20, 40 and 60 degree C, respectively. The compressive strength of plastic microspheres obviously drops when the temperature rises within a small range. The permeability coefficients of plastic microspheres increase in an exponential curve when the temperature rises. (authors)

[en] The cryogenic deuterium-tritium targets are very important to laser inertial confinement fusion, and mainly adopt plastics capsule, Be shell,foam shell, etc. According to the performance of the shell material, several different techniques are taken to fabricate cryogenic deuterium-tritium targets. For plastics capsule, 'high pressure fill deuterium-tritium, then freeze to low temperature' or 'fill-tube fill deuterium-tritium' method is applied. For Be shell, 'condensation deuterium-tritium at low-pressure, low temperature' or 'diffuse-bonding two Be hemisphere shells at high temperature, high pressure' means is adopted. For foam shell, the way of 'Absorbtion of deuterium-tritium liquid' is used. The development and the tendency of above technique and methods are summarized. (authors)

[en] Background: Due to an inverse factor to D-T fusion reaction, protium (H) content in D-T fuels is restricted for fuel quality control during Inertial Confinement Fusion (ICF) D-T cryogenic target fabrication. Purpose: This study aims to separate protium from a deuterium-tritium mixture in order to control protium content in DT fuels which is an important issue to support ICF related research work. Methods: A 2-m Palladium/kiesulghur (Pd/k) packed column with outer diameter of 6.4 mm is applied to filter protium, and a micro Thermal Cycling Absorption Process (TCAP) separation system is designed for protium enrichment in the column. When the feed gas (10% of total absorption amount) was input from the top end, the protium was accumulated and enriched in the column, resulting in the product gas from the bottom end purified after one heating-cooling cycle which is powered by a temperature control system-huber Unistat 912w. Results: After 33 automatic enrichment cycles in one testing batch, protium concentration in the column rised from 12% to 52% whilst the protium content in the product gas reduced to 3% compared with 12% protium content in the feed gas. The recycle rate of D-T by this batch was 82.5%. Conclusion: Protirm gets effective enriched in Pd/k filled column, and D-T mixture purification is effective by this enrichment system. (authors)

[en] At vacuum, the metal vanadium was heated to high temperature for long time in order to remove the gas absorbed on the metal surface. After several absorbing- releasing deuteride circles, vanadium can be activated and the absorbed deuteride is saturated, and the vanadium-deuteride ratio is 2.0. The activating conditions are as follows: 400 degree C of the activating temperature, 4 h of the lasting time, 80-100 degree C of the initial adsorbing temperature, purified deuterium or D-T gas, 2 or 3 circles of absorbing-releasing deuteride. Study of vanadium hydride performance was also performed, and the parameters measured in experiment are as follows: 0.2 MPa of equilibrium pressure at 20 degree C and 60 MPa of equilibrium pressure at 200 degree C, 0.47 L/g of absorption capacity, 6.1% of residual capacity. The prepared vanadium hydride gas resource by this method has been successful applied in ICF high-pressure filling experiment. (authors)

[en] A summary about concept-design, model-instauration of experiment system for filling gas in microspheres was reported. According to the model, the concept-design was adjusted and optimized, and the system was designed. Stocking and checking of the key parts, designing and preparing of the nonstandard parts were accomplished. The system was fixed and debugged. All technique targets of this system were archived. (authors)

[en] The experimental system is a multi-function system without radioactivity. It mainly is used to carrying experimental craft and studying device in advance. The system provide the important technique foundation for filling DT gas system after time, so it must have the safety and credibility like radioactive system. This article describes the essential process for building the experimental system and contrast the mainly function parameter to high pressure metal system after construction. The result shows not only the design of the system is reasonable, but also the function of the system is superior. (authors)

[en] The radiation effect of poly(vinyl alcohol) films used as a kind of gas-barrier material for inertial confinement fusion (ICF) targets was studied under the different conditions of β-ray from tritium decay. The changes of physical and chemical properties of the irradiated material samples were analyzed by FTIR, XRD and AFM. The tritium-hydrogen isotopic exchange reaction of the irradiated samples mainly occurs at C-H bond and the IR absorption peak of C-T bond obviously increases with the irradiation dose. For strong hydrogen bonding interaction, the isotopic exchange reaction doesn't occur at O-H bond. The crystallinity degree and surface morphology of the irradiated samples were changed. The tensile properties of irradiated poly(vinyl alcohol) films were measured by universal material testing machine. The results show that the change trend of mechanical properties is in accordance with the microstructures of the irradiated samples. (authors)

[en] The temperature gradient was employed to inject the fuel under control based on the fuel reservoir and the target chamber temperature controlling respectively, and the filling technology feasibility was verified by using a 5 μm diameter fill-tube. Additionally, influences of initial filling pressure, target chamber and fuel reservoir temperature on the filling processes were discussed. The experiment results indicate that the injection rate can be controlled by adjusting the fuel reservoir temperature when the initial filling pressure is 86 kPa and the target temperature is 19.5 K. (authors)

[en] The contribution of plumes to the solar wind has been subject to hot debate in the past decades. The EUV Imaging Spectrometer (EIS) on board Hinode provides a unique means to deduce outflow velocities at coronal heights via direct Doppler shift measurements of coronal emission lines. Such direct Doppler shift measurements were not possible with previous spectrometers. We measure the outflow velocity at coronal heights in several on-disk long-duration plumes, which are located in coronal holes (CHs) and show significant blueshifts throughout the entire observational period. In one case, a plume is measured four hours apart. The deduced outflow velocities are consistent, suggesting that the flows are quasi-steady. Furthermore, we provide an outflow velocity profile along the plumes, finding that the velocity corrected for the line-of-sight effect can reach 10 km s^–1 at 1.02 R _☉, 15 km s^–1 at 1.03 R _☉, and 25 km s^–1 at 1.05 R _☉. This clear signature of steady acceleration, combined with the fact that there is no significant blueshift at the base of plumes, provides an important constraint on plume models. At the height of 1.03 R _☉, EIS also deduced a density of 1.3 × 10⁸ cm^–3, resulting in a proton flux of about 4.2 × 10⁹ cm^–2 s^–1 scaled to 1 AU, which is an order of magnitude higher than the proton input to a typical solar wind if a radial expansion is assumed. This suggests that CH plumes may be an important source of the solar wind.