Fusion Device data - Wendelstein 7-AS

Title of DeviceWendelstein 7-AS
OrganizationMax-Planck-Institut für Plasmaphysik
LocationGarching, Germany
A. Device concept and components
Vacuum vessel: -- Plasma facing material:stainless steel
Divertor/limiter facing materialgraphite
Working Gasdeuterium, hydrogen
Boundary configuration: limiter (up to 1999), island divertor (since 2000)
Toroidal magnetic field (on axis), B (T): 2.5
Remarksmodular coils, low magnetic shear
B. Plasma geometry
Major radius, R(m): 2.0
Minor radius, a(m): < 0.18 (limiter), < 0.16 (divertor)
Plasma volume (m3): < 1.3 (limiter), < 1.0 (divertor)
C. Plasma parameters (maximum values)
Central ion temperature, Ti (keV): 1.8
Central electron temperature, Te (keV): 6.8
Line averaged plasma density, <n> (1020 m-3): 4.0
Central electron density, n (1020 m-3): -
Plasma current, I (MA): -
Discharge pulse duration (s): 3.0
Plasma beta, <β> (%): 3.4
Stored energy, (MJ): 0.048
Energy confinement time, τE (s): 0.06
D. Plasma heating and current drive (device values)
Ohmic heating, (MW):-
NBI heating, (MW):2.8 (absorbed power)
RF heating: -IC: (MW):1 (at antenna)
RF heating: -EC: (MW):2.4 (absorbed power)
RF heating: -LH: (MW):-
E. Reactor relevant plasma performance parameters
Triple fusion product, ( 1020 keV s m-3): 0.05
QDT factor (if available):-
F. Input information
Date of entry 6-Feb-2003
Data was entered by: Rudolf Brakel