A multi-channel capacitive probe for electrostatic fluctuation measurement in the Madison Symmetric Torus reversed field pinch
Abstract
A 40-channel capacitive probe has been developed to measure the electrostatic fluctuations associated with the tearing modes deep into Madison Symmetric Torus (MST) reversed field pinch plasma. The capacitive probe measures the ac component of the plasma potential via the voltage induced on stainless steel electrodes capacitively coupled with the plasma through a thin annular layer of boron nitride (BN) dielectric (also serves as the particle shield). When bombarded by the plasma electrons, BN provides a sufficiently large secondary electron emission for the induced voltage to be very close to the plasma potential. The probe consists of four stalks each with ten cylindrical capacitors that are radially separated by 1.5 cm. The four stalks are arranged on a 1.3 cm square grid so that at each radial position, there are four electrodes forming a square grid. Every two adjacent radial sets of four electrodes form a cube. The fluctuating electric field can be calculated by the gradient of the plasma potential fluctuations at the eight corners of the cube. The probe can be inserted up to 15 cm (r/a = 0.7) into the plasma. Furthermore, the capacitive probe has a frequency bandwidth from 13 Hz to 100 kHz, amplifier-circuit limit,more »
- Authors:
-
- Univ. of Science and Technology of China, Hefei (People's Republic of China)
- Univ. of Wisconsin, Madison, WI (United States)
- Univ. of Michigan, Ann Arbor, MI (United States)
- Univ. of Science and Technology of China, Hefei (People's Republic of China); Univ. of California, Los Angeles, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1466044
- Alternate Identifier(s):
- OSTI ID: 1349337
- Grant/Contract Number:
- FC02-05ER54814
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Review of Scientific Instruments
- Additional Journal Information:
- Journal Volume: 88; Journal Issue: 2; Journal ID: ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION
Citation Formats
Tan, Mingsheng, Stone, Douglas R., Triana, Joseph C., Almagri, Abdulgader F., Fiksel, Gennady, Ding, Weixing, Sarff, John S., McCollam, Karsten J., Li, Hong, and Liu, Wandong. A multi-channel capacitive probe for electrostatic fluctuation measurement in the Madison Symmetric Torus reversed field pinch. United States: N. p., 2017.
Web. doi:10.1063/1.4975095.
Tan, Mingsheng, Stone, Douglas R., Triana, Joseph C., Almagri, Abdulgader F., Fiksel, Gennady, Ding, Weixing, Sarff, John S., McCollam, Karsten J., Li, Hong, & Liu, Wandong. A multi-channel capacitive probe for electrostatic fluctuation measurement in the Madison Symmetric Torus reversed field pinch. United States. https://doi.org/10.1063/1.4975095
Tan, Mingsheng, Stone, Douglas R., Triana, Joseph C., Almagri, Abdulgader F., Fiksel, Gennady, Ding, Weixing, Sarff, John S., McCollam, Karsten J., Li, Hong, and Liu, Wandong. Wed .
"A multi-channel capacitive probe for electrostatic fluctuation measurement in the Madison Symmetric Torus reversed field pinch". United States. https://doi.org/10.1063/1.4975095. https://www.osti.gov/servlets/purl/1466044.
@article{osti_1466044,
title = {A multi-channel capacitive probe for electrostatic fluctuation measurement in the Madison Symmetric Torus reversed field pinch},
author = {Tan, Mingsheng and Stone, Douglas R. and Triana, Joseph C. and Almagri, Abdulgader F. and Fiksel, Gennady and Ding, Weixing and Sarff, John S. and McCollam, Karsten J. and Li, Hong and Liu, Wandong},
abstractNote = {A 40-channel capacitive probe has been developed to measure the electrostatic fluctuations associated with the tearing modes deep into Madison Symmetric Torus (MST) reversed field pinch plasma. The capacitive probe measures the ac component of the plasma potential via the voltage induced on stainless steel electrodes capacitively coupled with the plasma through a thin annular layer of boron nitride (BN) dielectric (also serves as the particle shield). When bombarded by the plasma electrons, BN provides a sufficiently large secondary electron emission for the induced voltage to be very close to the plasma potential. The probe consists of four stalks each with ten cylindrical capacitors that are radially separated by 1.5 cm. The four stalks are arranged on a 1.3 cm square grid so that at each radial position, there are four electrodes forming a square grid. Every two adjacent radial sets of four electrodes form a cube. The fluctuating electric field can be calculated by the gradient of the plasma potential fluctuations at the eight corners of the cube. The probe can be inserted up to 15 cm (r/a = 0.7) into the plasma. Furthermore, the capacitive probe has a frequency bandwidth from 13 Hz to 100 kHz, amplifier-circuit limit, sufficient for studying the tearing modes (5-30 kHz) in the MST reversed-field pinch.},
doi = {10.1063/1.4975095},
journal = {Review of Scientific Instruments},
number = 2,
volume = 88,
place = {United States},
year = {Wed Feb 08 00:00:00 EST 2017},
month = {Wed Feb 08 00:00:00 EST 2017}
}
Web of Science
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Works referencing / citing this record:
Development of a multi-channel capacitive probe for electric field measurements with fine spatial and high time resolution
journal, October 2018
- Nishizawa, T.; Almagri, A. F.; Goodman, W.
- Review of Scientific Instruments, Vol. 89, Issue 10
An overview of diagnostic upgrade and experimental progress in the KTX
journal, July 2019
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- Nuclear Fusion, Vol. 59, Issue 11