| In the laser inertial confinement fusion (ICF for short as follows) research, the neutron is especially valid to diagnose the fuel region characteristic. Neutron yield is one of the most important markings to measure ICF explode success or not. To measure neutron yield, we have developed various measure means. Deuterium tritium (shortening for DT) neutron yield is more than 107, activation is often used to measure. In neutron activation analysis, sample's transferring system is one of its most basic equipments. The sample's transferring system is called "rabbit system". After irradiation, the activated sample copper need to be quickly transferred from irradiation position to radioactivity test place. To fetch the activated sample from the shooting range is inconvenient, because it's about 30m~50m far between ShenguangⅢprototype target room and radioactivity test place. "Rabbit system" is necessary in the instance that sample need to be quickly transferred and manual operation is inconvenient. Rabbit system is already successfully applied in many fields such as the accelerator, reactor, and medicine and so on. Compare with the similar device, the sample size and mass this kind of device transferred in-home and international are all smaller. The sample diameter is just from 1 millimeter to 35 millimeters. The particularity of the rabbit system we designed lies in the big volume(aboutΦ50mm×10mm),great mass(~200g) of the neutron activated sample, and the long transferring distance(about 30m). This thesis developed a set of test "rabbit system" based on ShenguangⅢprototype, it's used to transfer activated sample for neutron activate analysis. The main innovation and creative work in this thesis are as follows:According to the characteristic of the sample movement, build up mathematics model. Using matlab to write procedure, the effect of gas pressure, sticky coefficient of lubricant and the distance between sample capsule and pipe wall on sample velocity is calculated and analyzed in detail. The calculating result shows that the rabbit system will transfer the sample to appointed position within 2.27s.The analogy calculation result provides data reference for the design of the pneumatic part in rabbit system.Aim to the pneumatic part of the "rabbit system", the important part of pneumatic system such as air-compressor and air tank is calculated and designed in detail. And the pneumatic element which satisfied for "rabbit system" application is selected through comparing. The sample box, sealing device and pipe join piece are also designed and processed.Time interval measure system is designed. With comparing the performance, the sensor used for velocity detection and photoelectricity switch used for positioning are selected. Schematic plan of the data acquisition system circuit is plotted. The software interface is programmed with VB language for velocity-measuring system.The "rabbit system" is installed and debugged. The time interval of the sample movement is measured under various kinds of condition, and the movement curve of the sample box is drawn, and the velocity curve of the sample motion characteristic is drawn. Compared with the theoretical value, main reasons which result in the difference between actual and theoretical value are analyzed. And the time uncertainty of the sample movement is analyzed in detail. The test result shows, the average velocity of sample is 12.8m/s at 0.65MPa, which is close to theoretical value 13.6m/s.Thereout it shows the design of the rabbit system is successful. |
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