skip to main content

DOE PAGESDOE PAGES

Title: Inductive flux usage and its optimization in tokamak operation

The energy flow from the poloidal field coils of a tokamak to the electromagnetic and kinetic stored energy of the plasma are considered in the context of optimizing the operation of ITER. The goal is to optimize the flux usage in order to allow the longest possible burn in ITER at the desired conditions to meet the physics objectives (500 MW fusion power with energy gain of 10). A mathematical formulation of the energy flow is derived and applied to experiments in the DIII-D tokamak that simulate the ITER design shape and relevant normalized current and pressure. The rate of rise of the plasma current was varied, and the fastest stable current rise is found to be the optimum for flux usage in DIII-D. A method to project the results to ITER is formulated. The constraints of the ITER poloidal field coil set yield an optimum at ramp rates slower than the maximum stable rate for plasmas similar to the DIII-D plasmas. Finally, experiments in present-day tokamaks for further optimization of the current rise and validation of the projections are suggested.
Authors:
 [1] ;  [1] ;  [1] ;  [2]
  1. General Atomics, San Diego, CA (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Grant/Contract Number:
FC02-04ER54698
Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 54; Journal Issue: 9; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; tokamak; flux; scaling; inductance
OSTI Identifier:
1353061

Luce, Timothy C., Humphreys, David A., Jackson, Gary L., and Solomon, Wayne M.. Inductive flux usage and its optimization in tokamak operation. United States: N. p., Web. doi:10.1088/0029-5515/54/9/093005.
Luce, Timothy C., Humphreys, David A., Jackson, Gary L., & Solomon, Wayne M.. Inductive flux usage and its optimization in tokamak operation. United States. doi:10.1088/0029-5515/54/9/093005.
Luce, Timothy C., Humphreys, David A., Jackson, Gary L., and Solomon, Wayne M.. 2014. "Inductive flux usage and its optimization in tokamak operation". United States. doi:10.1088/0029-5515/54/9/093005. https://www.osti.gov/servlets/purl/1353061.
@article{osti_1353061,
title = {Inductive flux usage and its optimization in tokamak operation},
author = {Luce, Timothy C. and Humphreys, David A. and Jackson, Gary L. and Solomon, Wayne M.},
abstractNote = {The energy flow from the poloidal field coils of a tokamak to the electromagnetic and kinetic stored energy of the plasma are considered in the context of optimizing the operation of ITER. The goal is to optimize the flux usage in order to allow the longest possible burn in ITER at the desired conditions to meet the physics objectives (500 MW fusion power with energy gain of 10). A mathematical formulation of the energy flow is derived and applied to experiments in the DIII-D tokamak that simulate the ITER design shape and relevant normalized current and pressure. The rate of rise of the plasma current was varied, and the fastest stable current rise is found to be the optimum for flux usage in DIII-D. A method to project the results to ITER is formulated. The constraints of the ITER poloidal field coil set yield an optimum at ramp rates slower than the maximum stable rate for plasmas similar to the DIII-D plasmas. Finally, experiments in present-day tokamaks for further optimization of the current rise and validation of the projections are suggested.},
doi = {10.1088/0029-5515/54/9/093005},
journal = {Nuclear Fusion},
number = 9,
volume = 54,
place = {United States},
year = {2014},
month = {7}
}