TITLE

DENSEPACK: An array of Langmuir probes in the limiter shadow plasma of the Alcator C tokamak fusion experiment

AUTHOR(S)
LaBombard, B.; Lipschultz, B.
PUB. DATE
October 1986
SOURCE
Review of Scientific Instruments;Oct86, Vol. 57 Issue 10, p2415
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The boundary plasma of the Alcator C tokamak exhibits poloidal asymmetries in plasma parameters. In order to investigate this phenomenon, an array of 80 closely spaced Langmuir probes has been built to directly sample this plasma region. This specially developed, densely packed probe array (DENSEPACK) is unique in that it provides a simultaneous, timedependent, two-dimensional mapping (minor radius r, poloidal angle θ) of plasma density, electron temperature, and floating potential over nearly the full 360° poloidal extent of the boundary plasma in this circular cross-section tokamak. The construction and operation of the DENSEPACK probe array, as welt as support hardware and software systems needed to handle the large volume of data generated by this array, are described in this paper.
ACCESSION #
9786426

 

Related Articles

  • Frequency dependence of tokamak plasma response to the externally applied rotating helical field. Kobayashi, M.; Kojima, H.; Zhai, K.; Takamura, S. // Physics of Plasmas;Aug2000, Vol. 7 Issue 8 

    The frequency dependence of the tokamak plasma response to the externally applied rotating helical field was investigated by measuring the radial profile of the perturbation field with small magnetic probes which were inserted in the plasma. The experimental results are discussed, directly...

  • Direct indication technique of plasma potential with differential emissive probe. Yao, Wang En; Intrator, T.; Hershkowitz, N. // Review of Scientific Instruments;Apr1985, Vol. 56 Issue 4, p519 

    We present a new method of plasma potential measurement with a differential emissive probe. The dc heated probes are combined with a feedback loop control circuit to measure plasma potential automatically. In addition, it is shown that connecting to the central point of the filaments reduces the...

  • Langmuir probe array for edge plasma study on the compact helical system heliotron/torsatron. Ohkuni, K.; Toi, K.; Ohdachi, S.; Takagi, S. // Review of Scientific Instruments;Jan1999, Vol. 70 Issue 1, p419 

    Describes the installation of a triple probe array on the compact helical system heliotron/torsatron in order to study plasma behaviors and transport in edge plasma region. Design of the probe array; Measurement of the plasma parameters; Associated increase of electron temperature and the...

  • Use of emissive probes in high pressure plasma. Yan, Shiluo; Kamal, Husain; Amundson, Jay // Review of Scientific Instruments;Dec1996, Vol. 67 Issue 12, p4130 

    Studies the characteristics of emissive probes in unmagnetized high pressure argon and helium plasmas. Interpretation of emissive probe current-voltage characteristics; Amplitude of the radio fluctuation of the plasma potential; Ionization near the emissive probe; Increase in the local ion...

  • Langmuir probe analysis for high density plasmas. Chen, Francis F. // Physics of Plasmas;Jun2001, Vol. 8 Issue 6, p3029 

    High-density, radio-frequency plasmas used in semiconductor processing have progressed to densities n>=5x10[sup 11] cm[sup -3], where the methods used to interpret Langmuir probe characteristics in low-density (10[sup 9-11] cm[sup -3]) plasma reactors are no longer valid. Though theory and...

  • Probing of flowing electron plasmas. Himura, H.; Nakashima, C.; Saito, H.; Yoshida, Z. // Physics of Plasmas;Oct2001, Vol. 8 Issue 10 

    Probing of streaming electron plasmas with finite temperature is studied. For the first time, a current-voltage characteristic of an electric probe is measured in electron plasmas. Due to the fast flow of the electron plasmas, the characteristic curve spreads out significantly and exhibits a...

  • Extraction of large-scale coherent structure from plasma turbulence using rake probe and wavelet analysis in a tokamak. Xu, G. S.; Wan, B. N.; Zhang, W. // Review of Scientific Instruments;Jun2006, Vol. 77 Issue 6, p063505 

    In fusion plasmas, intermittently occurring large-scale coherent structures in electrostatic turbulence sometimes contribute more than 50% of total transport, so the investigation on these coherent structures is important for understanding plasma confinement. New experimental techniques are...

  • Scanning ion sensitive probe for plasma profile measurements in the boundary of the Alcator C-Mod tokamak. Brunner, D.; LaBombard, B.; Ochoukov, R.; Whyte, D. // Review of Scientific Instruments;May2013, Vol. 84 Issue 5, p053507 

    A new Ion Sensitive Probe head has been created for the outer-midplane scanning probe system on the Alcator C-Mod tokamak. The new probe head contains three elements: an ion sensitive probe to measure ion temperature and plasma potential, a Langmuir probe to measure electron temperature,...

  • Point-to-point analysis of MSE data for plasma diagnostics and control. Giannella, R.; Hawkes, N. C.; Jayakumar, R.; Makowski, M.; Zabeo, L. // Review of Scientific Instruments;Oct2004 Part I & II, Vol. 75 Issue 10, p4247 

    A local analysis technique is presented for the analysis of MSE data to deduce the safety factor q in tokamak discharges. The technique preserves as much as possible the individuality of every single measure by a simple rule of translation of magnetic field pitch angle measurements into...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics