Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. Journal articles
  4. High-beta, steady-state hybrid scenario on DIII-D
 
research article

High-beta, steady-state hybrid scenario on DIII-D

Petty, C. C.
•
Kinsey, J. E.
•
Holcomb, C. T.
Show more
2016
Nuclear Fusion

The potential of the hybrid scenario (first developed as an advanced inductive scenario for high fluence) as a regime for high-beta, steady-state plasmas is demonstrated on the DIII-D tokamak. These experiments show that the beneficial characteristics of hybrids, namely safety factor >= 1 with low central magnetic shear, high stability limits and excellent confinement, are maintained when strong central current drive (electron cyclotron and neutral beam) is applied to increase the calculated non-inductive fraction to approximate to 100% (approximate to 50% bootstrap current). The best discharges achieve normalized beta of 3.4, IPB98(y,2) confinement factor of 1.4, surface loop voltage of 0.01 V, and nearly equal electron and ion temperatures at low collisionality. A 0D physics model shows that steady-state hybrid operation with Q(fus) similar to 5 is feasible in FDF and ITER. The advantage of the hybrid scenario as an advanced tokamak regime is that the external current drive can be deposited near the plasma axis where the efficiency is high; additionally, good alignment between the current drive and plasma current profiles is not necessary as the poloidal magnetic flux pumping self-organizes the current density profile in hybrids with an m/n = 3/2 tearing mode.

  • Details
  • Metrics
Type
research article
DOI
10.1088/0029-5515/56/1/016016
Web of Science ID

WOS:000367934400021

Author(s)
Petty, C. C.
Kinsey, J. E.
Holcomb, C. T.
Deboo, J. C.
Doyle, E. J.
Ferron, J. R.
Garofalo, A. M.
Hyatt, A. W.
Jackson, G. L.
Luce, T. C.
Show more
Date Issued

2016

Publisher

IOP Publishing Ltd

Published in
Nuclear Fusion
Volume

56

Issue

1

Article Number

016016

Subjects

steady state tokamak

•

hybrid

•

advanced tokamak

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Available on Infoscience
February 16, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/123796
Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés