Mishra J S, Sakamoto R, Motojima G, Matsuyama A, Yamada H
Graduate University for Advanced Studies, SOKENDAI Toki, Japan.
Rev Sci Instrum. 2011 Feb;82(2):023505. doi: 10.1063/1.3541807.
A low speed single barrel pellet injector, using a mechanical punch device has been developed for alternative injection in the large helical device. A pellet is injected by the combined operation of a mechanical punch and a pneumatic propellant system. The pellet shape is cylindrical, 3 mm in diameter and 3 mm in length. Using this technique the speed of the pellet can be controlled flexibly in the range of 100-450 m/s, and a higher speed can be feasible for a higher gas pressure. The injector is equipped with a guide tube selector to direct the pellet to different injection locations. Pellets are exposed to several curved parts with the curvature radii R(c) = 0.8 and 0.3 m when they are transferred in guided tubes to the respective injection locations. Pellet speed variation with pressure at different pellet formation temperatures has been observed. Pellet intactness tests through these guide tubes show a variation in the intact speed limit over a range of pellet formation temperatures from 6.5 to 9.8 K. Pellet speed reduction of less than 6% has been observed after the pellet moves through the curved guide tubes.
一种采用机械冲压装置的低速单筒弹丸注入器已被开发出来，用于大型螺旋装置中的替代注入。通过机械冲压和气动推进系统的联合操作来注入弹丸。弹丸形状为圆柱形，直径3毫米，长度3毫米。使用该技术，弹丸速度可在100 - 450米/秒范围内灵活控制，对于更高的气压，更高的速度也是可行的。该注入器配备有导管选择器，以将弹丸引导至不同的注入位置。当弹丸在导管中传输到各自的注入位置时，会经过几个曲率半径R(c) = 0.8米和0.3米的弯曲部分。观察到在不同弹丸形成温度下弹丸速度随压力的变化。通过这些导管进行的弹丸完整性测试表明，在6.5至9.8 K的弹丸形成温度范围内，完整速度极限存在变化。弹丸通过弯曲导管后，观察到弹丸速度降低小于6%。
