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Title: Fast piezoelectric valve offering controlled gas injection in magnetically confined fusion plasmas for diagnostic and fuelling purposes

Authors:
ORCiD logo [1];  [2];  [3];  [3];  [3];  [3];  [3];  [4];  [3];  [3];  [3];  [3];  [5];  [3];  [1];  [5];  [3];
  1. Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany, Physik Department E28, Technische Universität München, 85748 Garching, Germany
  2. Department of Engineering Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
  3. Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany
  4. Max Planck Institute for Plasma Physics, Wendelsteinstr. 1, 17491 Greifswald, Germany
  5. FZ Jülich, Institute for Energy- and Climate Research, 52428 Jülich, Germany
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1389657
Grant/Contract Number:
SC00013911; SC0014210
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 88; Journal Issue: 3; Related Information: CHORUS Timestamp: 2018-02-14 20:12:06; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics
Country of Publication:
United States
Language:
English

Citation Formats

Griener, M., Schmitz, O., Bald, K., Bösser, D., Cavedon, M., De Marné, P., Eich, T., Fuchert, G., Herrmann, A., Kappatou, A., Lunt, T., Rohde, V., Schweer, B., Sochor, M., Stroth, U., Terra, A., Wolfrum, E., and ASDEX Upgrade Team. Fast piezoelectric valve offering controlled gas injection in magnetically confined fusion plasmas for diagnostic and fuelling purposes. United States: N. p., 2017. Web. doi:10.1063/1.4978629.
Griener, M., Schmitz, O., Bald, K., Bösser, D., Cavedon, M., De Marné, P., Eich, T., Fuchert, G., Herrmann, A., Kappatou, A., Lunt, T., Rohde, V., Schweer, B., Sochor, M., Stroth, U., Terra, A., Wolfrum, E., & ASDEX Upgrade Team. Fast piezoelectric valve offering controlled gas injection in magnetically confined fusion plasmas for diagnostic and fuelling purposes. United States. doi:10.1063/1.4978629.
Griener, M., Schmitz, O., Bald, K., Bösser, D., Cavedon, M., De Marné, P., Eich, T., Fuchert, G., Herrmann, A., Kappatou, A., Lunt, T., Rohde, V., Schweer, B., Sochor, M., Stroth, U., Terra, A., Wolfrum, E., and ASDEX Upgrade Team. Wed . "Fast piezoelectric valve offering controlled gas injection in magnetically confined fusion plasmas for diagnostic and fuelling purposes". United States. doi:10.1063/1.4978629.
@article{osti_1389657,
title = {Fast piezoelectric valve offering controlled gas injection in magnetically confined fusion plasmas for diagnostic and fuelling purposes},
author = {Griener, M. and Schmitz, O. and Bald, K. and Bösser, D. and Cavedon, M. and De Marné, P. and Eich, T. and Fuchert, G. and Herrmann, A. and Kappatou, A. and Lunt, T. and Rohde, V. and Schweer, B. and Sochor, M. and Stroth, U. and Terra, A. and Wolfrum, E. and ASDEX Upgrade Team},
abstractNote = {},
doi = {10.1063/1.4978629},
journal = {Review of Scientific Instruments},
number = 3,
volume = 88,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1063/1.4978629

Citation Metrics:
Cited by: 2works
Citation information provided by
Web of Science

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  • A description is given of a valve suitable for use in studies involving the acceleration of plasmas into regions of high vacua. Valve opening durations of less than 60 μsec may be attained, and amounts of gas lower than 0.01 cc STP may be introduced. Valve performance characteristics and measuring techniques are discussed.
  • Spectroscopy of radiation emitted by impurities and hydrogen isotopes plays an important role in the study of magnetically confined fusion plasmas, both in determining the effects of impurities on plasma behavior and in measurements of plasma parameters such as electron and ion temperatures and densities, particle transport, and particle influx rates. Spectroscopic diagnostics of plasma radiation that are excited by collisional processes in the plasma, which are termed passive spectroscopic diagnostics to distinguish them from active spectroscopic diagnostics involving injected particle and laser beams, are reviewed. A brief overview of the ionization balance in hot plasmas and the relevant linemore » and continuum radiation excitation mechanisms is given. Instrumentation in the soft X-ray, vacuum ultraviolet, ultraviolet, visible, and near-infrared regions of the spectrum is described and examples of measurements are given. Paths for further development of these measurements and issues for their implementation in a burning plasma environment are discussed.« less
  • It is shown that during ion-Bernstein--wave heating experiments, nonlinear ion Landau damping absorbs efficiently the incident Bernstein waves in present-day tokamak and tandem-mirror plasmas. Further, this nonlinear absorption will dominate absorption by minority (impurity) ions.
  • A magnetohydrodynamic (MHD) model is applied to the problem of the stability of magnetically confined thermonuclear plasmas of interest in the pursuit of fusion power. Previous studies limited to two-dimensional configurations are here generalized to three-dimensional toroidal plasmas. Using finite Fourier representations in the angle coordinates and finite hybrid elements in the radial direction, the authors solve the discretized Euler-Lagrange equations to determine the linear stability properties of the plasma.
  • A high throughput scanning soft x-ray monochromator that uses a flat multilayer mirror in a near normal incidence configuration was built and tested in the Plasma Spectroscopy laboratory at Johns Hopkins University and operated on the DIII-D tokamak. Depending upon the mirror used, the monochromator covers the range 10--170 A, with a resolution of 0.25 to 10.8 A. The instrument was photometrically calibrated between 10 and 45 A. Spectra from DIII-D were obtained under a variety of discharge conditions over the entire range of the instrument. This paper describes the monochromator, the photometric calibration, and presents initial results.