plasma studies at dut

Plasma Studies at DUT

Xiaogang Wang

Center for Plasma Science & TechnologyDepartment of Physics

College of Advanced Science & TechnologyDalian University of Technology

May 2006, Dalian, China

OUTLINE

• Overview• Plasma Theory & Simulation

Team• Fusion Related Research• Brief Summary

Overview

• Plasma Physics Program at Department of Physics – Faculty

• > 20 with 2 Chair Professors and 3 Outstanding Young Career Awardees

– Graduate Program since 1982 • Enrollment: 25 students • Graduate > 10 PhDs annually

– Undergraduate Program since 1998• Enrollment: 30/60 alternatively

Overview

• University Center for Plasma Science & Technology– State Key Disciplinary (2 Nationwide)– 40+ faculty and 200+ graduate students– Plasma branch and theory & simulation

arm of State Key Lab of Materials Modification by Beams

– Research labs over the university (School of Environment Science, School of Chemical Technology, School of Life Science, School of Electronics & Info Technology)

Overview

•College of Advanced Science & Technology (CAST) – Fusion Energy & Plasma

Physics– Space Plasma Physics– Computational Physics &

Applications

Overview

• Research activities– MCF Plasma Physics– Space Plasma Physics (DSP-Cluster)– Plasma Proceedings (Plasma-Wall

Interactions)– Atmospheric Pressure Plasma Glow

Discharge– Plasma Sources– Beam Physics (Low Power, High

Current Beams)– Other Industry Applications

Plasma Theory & Simulation• University supported research

team for Basic Plasma Physics• A Faculty of 5 and 40+

graduate students• ~ RMB 1M annual research

budget• Associated with SWIP, USTC,

ZJU, HIT, PKU, NPU

Fusion Related Research• Fast magnetic reconnection

– Hall MHD reconnection

– Unmagnetized ions and agnetized electrons

– Length scale of ion inertial length di

Fusion Related Research

• Sawtooth crashes in Tokamaks – Wang et al, PRL 70, 1627 (1993): in sawtooth c

rashes (m=1 king-tearing mode)

– Reconnection ribbon width scaled by =VA/i=di

– Reconnection ribbon lengthrs0=rsA/i=(dirs)1/2

2

4 e

pe

Pd

c dt ne nec

V B J J BE

�

Fusion Related Research

Sawtooth crashes in Tokamaks Wang et al, PRL 70, 1627 (1993):

Sawtooth crashes in Tokamaks In Wang et al, PRL 70, 1627 (1993):

Fusion Related Research

• Mode-locking due to error field– Previous work in resistive tearing regime– Current research:

• Neoclassical effects?• Error field on double-tearing modes?• Toroidal rotations?

Fusion Related Research

• Resistive wall modes (RWM)– Rotating wall to stabilize RWM– Differential rotation of plasmas– Wesson, Phys. Plasma 5, 3816(1998):

• The plasma rotation would generate another type of RMW Vrotation > sqr(2)VA

– Further studies:• Compressibility: Vrotation > cs

– Our research (linear, numerical): S. Y. Cui tomorrow afternoon

J. A. Wesson, Phys. Plasma 5, 3816 (1998)

Brief Summary

• A strong plasma program DLUT a wide spectrum

• A strong education basis also• Fusion studies are picking up• Collaborations needed