学术报告

9月26日 Impurities in the core of magnetically confined fusion (MCF) plasma:transport, MHD and diagnostic challenges

2017-09-21|【 【打印】【关闭】

  报告题目:Impurities in the core of magnetically confined fusion (MCF) plasma:transport, MHD and diagnostic challenges

  报告人: Luis F. Delgado-Aparicio (PPPL)

  时间:9月26日上午9:30

  地点:四号楼601会议室

  报告人简历:A native of Peru in South America, Luis F. Delgado-Aparicio earned a bachelor’s degree in physics from the Pontificia Universidad Catolica del Peru in 1997, and a master’s degree in Astrophysics from Princeton University in 2001. He earned a second master’s in physics from Johns Hopkins University and received his PhD in physics from Johns Hopkins in 2007 working in novel soft x-ray (SXR) diagnostics and impurity transport in NSTX at the Princeton Plasma Physics Laboratory (PPPL). He then joined PPPL in 2009 and spent nearly four years as a visiting scientist at the Massachusetts Institute of Technology (MIT) in Cambridge, MA, before returning to PPPL in the summer of 2013. Since then Luis F. has won few awards in plasma physics like the DOE early career award in 2015 and the General Atomics Torkil Jensen Award in 2016. He currently builds SXR diagnostics for NSTX-U, MST, DIII-D, WEST and ITER.

  摘要:With the selection of tungsten for the divertor in ITER, understanding the sources, transport and confinement of high-Z impurities is crucial to ITER success. Controlling impurity transport to avoid accumulation in the core is necessary to achieve and maintain high fusion performance in the presence of high-Z plasma-facing components (PFCs). In this talk we will review the impact that transport of low- to high-Z impurities have on the average plasma charge (Zeff), resistivity and radiated power density (Prad), and hence on the mode onset of core MHD instabilities [1] and density limits [2]. Line-emission from medium- to high-Z impurities hinders also our ability to interpret signals from conventional diagnostic systems. A new compact multi-energy soft x-ray camera has been developed at PPPL for time, energy and space-resolved measurements of the soft-xray emissivity in magnetically confined fusion plasmas [3]. Being the first of its kind, this novel diagnostic will be used to resolve the impurity emission, study impurity transport and impurity-induced MHD and will become an essential part of a control algorithm coupled to physics and engineer actuators for minimizing impurity accumulation in tokamaks. This technique should be explored also as a burning plasma diagnostic in-view of its simplicity and robustness. First tests at Alcator C-Mod will be shown. Plans for current and future installations at NSTX-U, DIII-D, MST, WEST and ITER will be discussed.

  [1] D. A. Gates and L. F. Delgado-Aparicio, Phys. Rev. Lett., 108, 165004, (2012).

  [2] L. F. Delgado-Aparicio, et al., Phys. Rev. Letters, 110, 065006, (2013).

  欢迎感兴趣的人员参加!