二级轻气炮发射氘丸的研究进展

Some Developments on shooting the Deuterium Ice Pellets with a Hypervelocity by a Two-Stage Light Gas Gun

核燃料（如氘丸）的添加是维持核反应正常运行的关键技术，在核能发电中占重要地位。目前世界上大的ＴＯＫＭＡＫ装置采用二级轻气炮来进行燃料的添加，本文介绍：１．发射丸的特殊二级轻气炮；２．发射氘丸的弹托设计；３．利用炮口射流后效作用的弹托分离技术。利用上述技术得到了目前世界上最高的氘丸发射速度——４ｋｍ／ｓ，氘冰完整，在规定距离内弹托分离位置满足设计要求，发射的重复性极好。

Fuelling(or pellets of solid deuteriuim)injection to the plasma is a key problem for keeping fusion reaction in continuous service. It is also very important at proving the feasibility of using nuclear fusion as a source of energy. In the world, it seems now reasonable to install a two-stage light gas gun on the large TOKMAK device for the investiga-tion of fuelling/re-fuelling. Three main areas of work for JET pellets injector are discribed in this paper:1.A special two-stage light gas gun which used in shooting the deu-terium ice pellets. 2.Sabot design for successful launching the pellets of frozen hydrogen isotops. 3.Separation technology of model from sabot by the jet force at the barrel exit. Based on these technologies,the deuterium ice pellets have a velocity of 4km/s. It is the highest velocity in the world up to now. At these speeds,reproducible pellets of good quality ice and satisfactory sabot removal conditions during the definite distance have also been achieved.