Impurity pellet injection into current driven plasmas of the JIPP T-IIU tokamak
Impurity pellet injection into current driven plasmas of the JIPP T-IIU tokamak
复制标题
将杂质颗粒注入 JIPP T-IIU 托卡马克的电流驱动等离子体
DOI：
10.1088/0029-5515/30/5/014
复制
发表时间：
1988
期刊：
影响因子：
3.3
通讯作者：
H. Yamada
中科院分区：
文献类型：
--
作者：
S. Morita;E. Kawatoh;K. Ohkubo;S. Kubo;K. Ida;Y. Ogawa;K. Adati;T. Amano;J. Fujita;Y. Hamada;S. Hidekuma;K. Kawahata;T. Ozaki;H. Tanahashi;Y. Taniguchi;H. Yamada
为了研究相互作用，用直径为0.5 mm、速度为4 0 0±10 0 m·S−1的不锈钢和塑料碳组成的杂质颗粒注入快波驱动等离子体，持续等离子体电流为35~5 0kA，电子密度为(2~5)×10 12 cm−3。不锈钢颗粒和塑料碳颗粒的密度升高分别为(6~8)×10 12 cm−3和4×10 12 cm−3。在颗粒注入时，电流驱动的等离子体没有显示出破坏，而所有的欧姆放电都是破坏的。这些现象可以通过热电子和非热电子与烧蚀粒子碰撞时间的不同来解释。根据对软X射线辐射时间演化的测量，注入杂质的衰减时间估计为25ms。根据密度升高计算了注射弹丸材料的有效电荷态，发现它们在0.8-1.5的范围内。
For interaction studies, impurity pellets of stainless steel and plastic carbon with a diameter of 0.5 mm and a velocity of 400 ± 100 m·s−1 have been injected into plasmas driven by fast wave current, with a sustained plasma current of 35-50 kA and an electron density of (2-5) × 1012 cm−3. The density rise is (6-8) × 1012 cm−3 for stainless steel pellets and 4 × 1012 cm−3 for plastic carbon pellets. At pellet injection, the current driven plasmas show no disruption, whereas all of the Ohmic discharges are disruptive. These phenomena are interpreted by a difference in the collision time with ablated pellets between thermal and non-thermal electrons. From measurements of the temporal evolution of the soft X-ray emission, the decay time of the injected impurity is estimated to be 25 ms. The effective charge states of the material of the injected pellets are calculated from the density rise and it is found that they are in the range of 0.8-1.5.