%0 Journal Article
%T Establishment of Configuration with Optimized Current Profile in Pellet Fuelled Discharge on HL-2A
%A GAO Qing-Di
%A LONG Yong-Xing
%A DING Xuan-Tong
%A PAN Yu-Dong
%A ZHOU Yan
%A WANG Hao
%A <br>高庆弟
%A 龙永兴
%A 丁玄同
%A 潘宇东
%A 周艳
%A 王灏
%J 中国物理快报
%D 2008
%I 
%X A sawtooth-free period is produced following the pellet injection in the pellet fuelled discharge of qa=3.4 (where qa is the safety factor at the plasma boundary) in the HL-2A tokamak. Establishment of the current profile such as in the hybrid scenario is studied under the condition of pellet injection in HL-2A. It is shown that a q-profile of weak negative shear is produced immediately after the pellet injection, and it then evolves to a broad flat profile with q0>1 (where q0 is the safety factor at the centre). The measured MHD mode structures evidence consistencies of the evaluated q-profile with locations of the q=1 surface in the sawtoothing period and of the q=2 surfacein the sawtooth-free period. TRANSP analysis indicates that the energy confinement is enhanced substantially during and after pellet injection, which is resulted from the q-profile optimization and the plasma density peaking.
%K 52
%K 55
%K Fa
%K 52
%K 50
%K Nr<br>核技术
%K 托卡马克装置
%K 颗粒燃料流动
%K 最优流动面
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=E27DA92E19FE279A273627875A70D74D&aid=28A0724BE205DB63DABF12190A187518&yid=67289AFF6305E306&vid=C5154311167311FE&iid=0B39A22176CE99FB&sid=3EABEBD973E45554&eid=250DF325A002B9CC&journal_id=0256-307X&journal_name=中国物理快报&referenced_num=0&reference_num=0