Authors: S Woodruff A I D Macnab T M Ziemba K E Miller
Publish Date: 2008/11/20
Volume: 28, Issue: 2, Pages: 229-234
Abstract
By repeated injection of magnetic helicity K = 2φψ on timescales short compared with the dissipation time τinj τ K it is possible to produce toroidal currents relevant to POPlevel experiments Here we discuss an effective injection rate dotK texteff = 2psi textgun I textgun dotL due to the expansion of a series of current sheets and their subsequent reconnection to form spheromaks and compression into a copper fluxconserving chamber The benefits of repeated injection are that the usual limits to current amplification can be exceeded and an efficient quasisteady sustainment scenario is possible within minimum impact on confinement A new experiment designed to address the physics of pulsed formation and sustainment is describedThe authors would like to acknowledge useful discussions with Prof Uri Shumlak Dr Harry McLean and thanks other WS Inc team members for hard work especially Wandee Earp This work was performed under the auspices of the US DoE by Woodruff Scientific Inc under Contract No DEFG0206ER84449
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