May 8-10

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Abstracts

Author: Stephanie J Diem
Requested Type: Poster
Submitted: 2023-04-02 22:36:06

Co-authors: M.W. Aslin, M.W. Bongard, M.T. Borchardt, A.L. Ferris, J.A. Goetz, A.K. Keyhani, B.A. Kujak-Ford, B.T. Lewicki, M.D. Nornberg, J.K. Peery, C. Pierren, C. Rodriguez Sanchez, J.A. Reusch, R.K. Sassella, C.E. Schaefer, A.C. Sontag, T.N. Tierney, J.D. Webersk

Contact Info:
University of Wisconsin-Madison
1500 Engineering Drive
Madison,   53706
USA

Abstract Text:
Minimizing or eliminating the need for induction from a central solenoid during startup, ramp-up and sustainment of a tokamak plasma is a critical challenge in magnetic fusion. Solenoid-free startup techniques such as helicity and RF wave injection offer the potential to simplify large-scale devices by reducing the requirements of the solenoid. The Pegasus-III Experiment is a new solenoid-free ST (A > 1.22, Ip < 0.3 MA, BT < 0.6 T, pulse length ~ 100 ms) focused on studying innovative non-solenoidal tokamak startup techniques. Pegasus-III will be equipped with a new local helicity injection (LHI) system capable of Ip < 0.3 MA, sustained and transient coaxial helicity injection (CHI) systems, and a 28 GHz RF system for electron Bernstein wave and electron cyclotron heating. Initial experiments will establish high-Ip LHI scenarios, followed by deployment and tests of transient CHI, modest sustained CHI and low-power RF studies. Pegasus-III will provide key enabling fusion power plant relevant technology to directly test proposed plasma startup and ramp-up scenarios envisioned for larger scale ST devices and investigate methods to synergistically improve the target plasma for consequent bootstrap and NBI current sustainment.


*Work supported by US DOE grants DE-SC0019008 and DE-SC0020402

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