POP Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter UniPHY Group iResearch App Facebook

Physics of Plasmas / Volume 15 / Issue 8 / ARTICLES / Magnetically Confined Plasmas, Heating, Confinement

Phys. Plasmas 15, 082501 (2008); http://dx.doi.org/10.1063/1.2968205 (10 pages)

Temperature and density characteristics of the Helicity Injected Torus-II spherical tokamak indicating closed flux sustainment using coaxial helicity injection

W. T. Hamp1, T. R. Jarboe1, B. A. Nelson1, R. G. O’Neill1, R. Raman1, A. J. Redd1, B. T. Stewart1, and D. Mueller2

1University of Washington, Box 352250, Seattle, Washington 98195-2250, USA
2Princeton Plasma Physics Laboratory, Princeton University, P.O. Box 453, Princeton, New Jersey 08543, USA

View MapView Map

(Received 8 April 2008; accepted 17 July 2008; published online 12 August 2008)

The electron temperature and density profiles of plasmas in the Helicity Injected Torus [HIT-II: T. R. Jarboe et al., Phys. Plasmas 5, 1807 (1998) ] experiment are measured by multipoint Thomson scattering (MPTS). The HIT-II device is a small low-aspect-ratio tokamak (major radius 0.3 m, minor radius 0.2 m, toroidal field of up to 0.5 T), capable of inductive ohmic (OH) current drive, Coaxial Helicity Injection (CHI) current drive, or combinations of both. The temperature and density characteristics have been characterized by a ruby laser MPTS diagnostic at up to six locations within the plasma for a single diagnostic time per discharge. Observed hollow temperature profiles of CHI discharges are inconsistent with open flux only predictions for CHI and indicate a closed flux region during CHI current drive.

© 2008 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. THE HIT-II DEVICE
  3. HIT-II MULTIPOINT THOMSON DIAGNOSTIC
  4. PLASMA TEMPERATURE AND DENSITY CHARACTERISTICS
    1. Characteristics of transformer driven plasmas
    2. Characteristics of CHI plasmas
    3. Characteristics of CHI initiated OH discharges
    4. Characteristics of OH discharges with CHI driven edge current
  5. DISCUSSION
    1. Evidence of closed flux sustainment by CHI
    2. Resolving the discrepancy between experiment and model
      1. The Boozer model
      2. The Moses model
  6. SUMMARY

RELATED DATABASES

To view database links for this article, you need to log in.

KEYWORDS and PACS

Keywords

discharges (electric), plasma density, plasma diagnostics, plasma temperature, plasma toroidal confinement, Tokamak devices

PACS

  • 52.55.Fa

    Tokamaks, spherical tokamaks

  • 52.55.Wq

    Current drive; helicity injection

  • 52.70.Kz

    Optical (ultraviolet, visible, infrared) measurements

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2968205

PUBLICATION DATA

ISSN

1070-664X (print)  
1089-7674 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    J. B. Taylor, Rev. Mod. Phys. 58, 741 (1986).

    B. A. Nelson, T. R. Jarboe, A. K. Martin, D. J. Orvis, J. Xie, C. Zhang, and L. Zhou, Phys. Plasmas 2, 2337 (1995)PHPAEN000002000006002337000001.

    D. S. Darrow, M. Ono, C. B. Forest, G. J. Greene, Y. S. Hwang, H. K. Park, R. J. Taylor, P. A. Pribyl, J. D. Evans, K. F. Lai, and J. R. Liberati, Phys. Fluids B 2, 1415 (1990)PFBPEI000002000006001415000001.

    T. R. Jarboe, J. J. Wysocki, J. C. Fernández, I. Henins, and G. J. Marklin, Phys. Fluids B 2, 1342 (1990)PFBPEI000002000006001342000001.

    M. Nagata, T. Kanki, N. Fukumoto, and T. Uyama, Phys. Plasmas 10, 2932 (2003)PHPAEN000010000007002932000001.

    A. al Karkhy, P. K. Browning, G. Cunningham, S. J. Gee, and M. G. Rusbridge, Phys. Rev. Lett. 70, 1814 (1993).

    R. G. O'Neill, A. J. Redd, W. T. Hamp, R. J. Smith, and T. R. Jarboe, Phys. Plasmas 12, 122506 (2005)PHPAEN000012000012122506000001.

    A. J. Redd, T. R. Jarboe, W. T. Hamp, B. A. Nelson, R. G. O'Neill, and R. J. Smith, Phys. Plasmas 15, 022506 (2008)PHPAEN000015000002022506000001.

    A. J. Redd, T. R. Jarboe, B. A. Nelson, R. G. O'Neill, and R. J. Smith, Phys. Plasmas 14, 112511 (2007)PHPAEN000014000011112511000001.

    A. H. Boozer, Phys. Fluids B 5, 2271 (1993)PFBPEI000005000007002271000001.

    R. W. Moses, R. A. Gerwin, and K. F. Shoenberg, Phys. Plasmas 8, 4839 (2001)PHPAEN000008000011004839000001.

    T. R. Jarboe, M. A. Bohnet, A. T. Mattick, B. A. Nelson, and D. J. Orvis, Phys. Plasmas 5, 1807 (1998)PHPAEN000005000005001807000001.

    A. J. Redd, B. A. Nelson, T. R. Jarboe, P. Gu, R. Raman, and R. J. Smith, Phys. Plasmas 9, 2006 (2002)PHPAEN000009000005002006000001.

    D. Mueller, B. A. Nelson, W. T. Hamp, A. J. Redd, T. R. Jarboe, R. G. O'Neill, and R. J. Smith, Phys. Plasmas 12, 070702 (2005)PHPAEN000012000007070702000001.

    R. Raman, T. R. Jarboe, B. A. Nelson, W. T. Hamp, V. A. Izzo, R. G. O'Neill, A. J. Redd, P. E. Sieck, and R. J. Smith, Phys. Plasmas 11, 2565 (2004)PHPAEN000011000005002565000001.

    R. Raman, T. R. Jarboe, W. T. Hamp, A. J. Redd, B. A. Nelson, R. G. O'Neill, P. E. Sieck, and R. J. Smith, Phys. Plasmas 14, 022504 (2007)PHPAEN000014000002022504000001.

    P. Gu, M. Nagata, K. J. McCollam, T. R. Jarboe, B. A. Nelson, and A. J. Redd, Rev. Sci. Instrum. 75, 1337 (2004)RSINAK000075000005001337000001.

    P. D. Jewell, R. J. Smith, and T. R. Jarboe, Rev. Sci. Instrum. 74, 80 (2003)RSINAK000074000001000080000001.

    M. R. Stoneking and D. J. Den Hartog, Rev. Sci. Instrum. 68, 914 (1996)RSINAK000068000001000914000001.

    Y. Ono, A. Morita, and M. Katsurai, Phys. Fluids B 5, 3691 (1993)PFBPEI000005000010003691000001.

    T. R. Jarboe, Phys. Plasmas 12, 058103 (2005)PHPAEN000012000005058103000001.


Figures (12) Tables (1)

Access to article objects (figures, tables, multimedia) requires a subscription; log in to view available files.
(Access to supplementary files, where available, is free for this journal.)

Access to article objects (figures, tables, multimedia) requires a subscription; log in to view available files.
(Access to supplementary files, where available, is free for this journal.)



Close

Google Calendar

ADVERTISEMENT

Your Recent History Recent History Help

Recently Viewed

  1. Temperature and density characteristics of the Helicity Injected Torus-II spherical tokamak indicating closed flux sustainment using coaxial helicity injection
  2. Coaxial helicity injection in open-flux low-aspect-ratio toroidal discharges
  3. Turbulent transport of alpha particles in reactor plasmas
  4. Three-dimensional magnetohydrodynamic simulations of the Helicity Injected Torus with Steady Inductive drive
Go to AIP Home
Copyright © American Institute of Physics
close