Regular Articles

Full Text / References

Temperature Diagnostics for Field-Reversed Configuration Plasmas on the Pulsed High Density (PHD) Experiment

Hiroshi GOTA, Samuel ANDREASON, George VOTROUBEK, Chris PIHL and John SLOUGH

Plasma Dynamics Laboratory, University of Washington, Seattle, WA 98195, USA

(Received 3 December 2006 / Accepted 13 March 2007 / Published 20 November 2007)

Abstract

The high flux source for the Pulsed High Density Experiment (PHDX) has been constructed, and field-reversed configuration (FRC) plasmas are being produced. To diagnose FRC plasma temperatures three kinds of diagnostic systems have been set up on PHDX; λ = 632.8 nm He-Ne laser interferometer system at the midplane for total temperature T_total, 16 channel spectrometer for ion temperature T_i and soft x-ray (SXR) measurement system for electron temperature T_e viewed along z-axis, respectively. The SXR measurement system consists of five sets of collimators and AXUV100 photodiodes with directly deposited filters which have different bandpass regions. As a result of preliminary temperature diagnostics, the following plasma parameters are estimated during a relatively quiescent phase of FRCs; T_total ∼ 50 eV, T_i ∼ 50 eV and T_e ∼ 25 eV. This result does not agree with the equilibrium relation of T_total ≈ T_i + T_e, and it must be caused by plasma condition and our assumptions in the spectral analysis.

Copyright (c) 2007 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

field-reversed configuration, FRC, theta pinch, compact torus, temperature diagnostics, soft x-ray

DOI: 10.1585/pfr.2.S1050

Full Text

PDF format (1.2Mbytes)

References

• [1] M. Tuszewski, Nucl. Fusion 28, 2033 (1988).
• [2] F.C. Jahoda et al., Phys. Rev. 119, 843 (1960).
• [3] J. Kiraly et al., Nucl. Fusion 27, 397 (1987).
• [4] International Radiation Detectors (http://www.ird-inc.com).
• [5] H. Gota et al., Rev. Sci. Instrum. 77, 10F319 (2006).

This paper may be cited as follows:

Hiroshi GOTA, Samuel ANDREASON, George VOTROUBEK, Chris PIHL and John SLOUGH, Plasma Fusion Res. 2, S1050 (2007).