Home | Sitemap | Contact | Chinese | CAS
Search: 
About AMSS Research People International Cooperation News Societies & Journals Papers Resources Education & Training Join Us Links
Research
Location: Home >  Research >  Colloquia & Seminars
(2020.07.03)Ruili Zhang:Symplectic simulation for the gyrocenter dynamics of charged particles
Author:
ArticleSource:
Update time: 2020-07-14
Close
A A A
Print
 

 

Academy of Mathematics and Systems Science, CAS
Colloquia & Seminars

Speaker:

Ruili Zhang,Beijing Jiaotong University

Inviter:  
Title:
Symplectic simulation for the gyrocenter dynamics of charged particles
Time & Venue:
2020.07.03 10:30-11:30 Tencent meeting
Abstract:

Tencent meetingID:553 526 408

Website: https://meeting.tencent.com/s/ZRrwmXDCKSAW

Gyrocenter dynamics of charged particles plays a fundamental and important role in plasma physics, which requires accuracy and conservation in a long-time simulation. Variational symplectic algorithms and canonicalized symplectic algorithms have been developed for gyrocenter dynamics. However, variational symplectic methods are always unstable, and canonicalized symplectic methods need coordinates transformation case by case, which is usually difficult to find. In the following, we start from the degenerate Lagrangian of the gyrocenter dynamics of charged particles, and give a Hamiltonian system with constraints. The system can be written as in a port-Hamiltonian differential-algebraic equation (pHDAE). The flow on the manifold generated by the system is symplectic. So for the special form of pHDAE, we can apply the symplectic PRK methods. The implementation of the methods is described, and some numerical tests are reported.

 

 

 

 

Appendix:
Copyright@2008, All Rights Reserved, Academy of Mathematics and Systems Science, CAS
Tel: 86-10-82541777 Fax: 86-10-82541972 E-mail: contact@amss.ac.cn