Advances in time-resolved measurement of magnetic field and electron temperature in low-magnetic-field plasmas

D. J. Den Hartog, J. R. Ambuel, M. T. Borchardt, K. J. Caspary, E. A. Den Hartog, A. F. Falkowski, W. S. Harris, J. Ko, N. A. Pablant, J. A. Reusch, P. E. Robl, H. D. Stephens, H. P. Summers, Y. M. Yang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Internal time-resolved measurement of magnetic field and electron temperature in low-field ( 1 T) plasmas is a difficult diagnostic challenge. To meet this diagnostic challenge in the Madison Symmetric Torus reversed-field pinch, two techniques are being developed: 1) spectral motional Stark effect (MSE) and 2) Fast Thomson scattering. For spectral MSE, the entire Stark-split H spectrum emitted by hydrogen neutral beam atoms is recorded and analyzed using a newly refined atomic emission model. A new analysis scheme has been developed to infer both the polarization direction and the magnitude of Stark splitting, from which both the direction and magnitude of the local magnetic field can be derived. For Fast Thomson scattering, two standard commercial flashlamp-pumped Nd:YAG lasers have been upgraded to “pulse-burst” capability. Each laser produces a burst of up to fifteen pulses at repetition rates 1–12.5 kHz, thus enabling recording of the dynamic evolution of the electron temperature profile and electron temperature fluctuations. To further these capabilities, a custom pulse-burst laser system is now being commissioned. This new laser is designed to produce a burst of laser pulses at repetition frequencies 5–250 kHz.

Fingerprint

Electron temperature
Time measurement
Laser pulses
bursts
time measurement
electron energy
Magnetic fields
Plasmas
Stark effect
Thomson scattering
Lasers
pulses
magnetic fields
lasers
repetition
Scattering
Hydrogen
temperature
neutral beams
temperature profiles

Keywords

  • magnetic field
  • electron temperature
  • laser pulses
  • time-resolved measurement

Cite this

Den Hartog, D. J., Ambuel, J. R., Borchardt, M. T., Caspary, K. J., Den Hartog, E. A., Falkowski, A. F., ... Yang, Y. M. (2011). Advances in time-resolved measurement of magnetic field and electron temperature in low-magnetic-field plasmas. Fusion Science and Technology, 59(11), 124-127.
Den Hartog, D. J. ; Ambuel, J. R. ; Borchardt, M. T. ; Caspary, K. J. ; Den Hartog, E. A. ; Falkowski, A. F. ; Harris, W. S. ; Ko, J. ; Pablant, N. A. ; Reusch, J. A. ; Robl, P. E. ; Stephens, H. D. ; Summers, H. P. ; Yang, Y. M. / Advances in time-resolved measurement of magnetic field and electron temperature in low-magnetic-field plasmas. In: Fusion Science and Technology. 2011 ; Vol. 59, No. 11. pp. 124-127.
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abstract = "Internal time-resolved measurement of magnetic field and electron temperature in low-field ( 1 T) plasmas is a difficult diagnostic challenge. To meet this diagnostic challenge in the Madison Symmetric Torus reversed-field pinch, two techniques are being developed: 1) spectral motional Stark effect (MSE) and 2) Fast Thomson scattering. For spectral MSE, the entire Stark-split H spectrum emitted by hydrogen neutral beam atoms is recorded and analyzed using a newly refined atomic emission model. A new analysis scheme has been developed to infer both the polarization direction and the magnitude of Stark splitting, from which both the direction and magnitude of the local magnetic field can be derived. For Fast Thomson scattering, two standard commercial flashlamp-pumped Nd:YAG lasers have been upgraded to “pulse-burst” capability. Each laser produces a burst of up to fifteen pulses at repetition rates 1–12.5 kHz, thus enabling recording of the dynamic evolution of the electron temperature profile and electron temperature fluctuations. To further these capabilities, a custom pulse-burst laser system is now being commissioned. This new laser is designed to produce a burst of laser pulses at repetition frequencies 5–250 kHz.",
keywords = "magnetic field , electron temperature , laser pulses , time-resolved measurement",
author = "{Den Hartog}, {D. J.} and Ambuel, {J. R.} and Borchardt, {M. T.} and Caspary, {K. J.} and {Den Hartog}, {E. A.} and Falkowski, {A. F.} and Harris, {W. S.} and J. Ko and Pablant, {N. A.} and Reusch, {J. A.} and Robl, {P. E.} and Stephens, {H. D.} and Summers, {H. P.} and Yang, {Y. M.}",
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Den Hartog, DJ, Ambuel, JR, Borchardt, MT, Caspary, KJ, Den Hartog, EA, Falkowski, AF, Harris, WS, Ko, J, Pablant, NA, Reusch, JA, Robl, PE, Stephens, HD, Summers, HP & Yang, YM 2011, 'Advances in time-resolved measurement of magnetic field and electron temperature in low-magnetic-field plasmas' Fusion Science and Technology, vol. 59, no. 11, pp. 124-127.

Advances in time-resolved measurement of magnetic field and electron temperature in low-magnetic-field plasmas. / Den Hartog, D. J.; Ambuel, J. R.; Borchardt, M. T.; Caspary, K. J.; Den Hartog, E. A.; Falkowski, A. F.; Harris, W. S.; Ko, J.; Pablant, N. A.; Reusch, J. A.; Robl, P. E.; Stephens, H. D.; Summers, H. P.; Yang, Y. M.

In: Fusion Science and Technology, Vol. 59, No. 11, 01.01.2011, p. 124-127.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Advances in time-resolved measurement of magnetic field and electron temperature in low-magnetic-field plasmas

AU - Den Hartog, D. J.

AU - Ambuel, J. R.

AU - Borchardt, M. T.

AU - Caspary, K. J.

AU - Den Hartog, E. A.

AU - Falkowski, A. F.

AU - Harris, W. S.

AU - Ko, J.

AU - Pablant, N. A.

AU - Reusch, J. A.

AU - Robl, P. E.

AU - Stephens, H. D.

AU - Summers, H. P.

AU - Yang, Y. M.

PY - 2011/1/1

Y1 - 2011/1/1

N2 - Internal time-resolved measurement of magnetic field and electron temperature in low-field ( 1 T) plasmas is a difficult diagnostic challenge. To meet this diagnostic challenge in the Madison Symmetric Torus reversed-field pinch, two techniques are being developed: 1) spectral motional Stark effect (MSE) and 2) Fast Thomson scattering. For spectral MSE, the entire Stark-split H spectrum emitted by hydrogen neutral beam atoms is recorded and analyzed using a newly refined atomic emission model. A new analysis scheme has been developed to infer both the polarization direction and the magnitude of Stark splitting, from which both the direction and magnitude of the local magnetic field can be derived. For Fast Thomson scattering, two standard commercial flashlamp-pumped Nd:YAG lasers have been upgraded to “pulse-burst” capability. Each laser produces a burst of up to fifteen pulses at repetition rates 1–12.5 kHz, thus enabling recording of the dynamic evolution of the electron temperature profile and electron temperature fluctuations. To further these capabilities, a custom pulse-burst laser system is now being commissioned. This new laser is designed to produce a burst of laser pulses at repetition frequencies 5–250 kHz.

AB - Internal time-resolved measurement of magnetic field and electron temperature in low-field ( 1 T) plasmas is a difficult diagnostic challenge. To meet this diagnostic challenge in the Madison Symmetric Torus reversed-field pinch, two techniques are being developed: 1) spectral motional Stark effect (MSE) and 2) Fast Thomson scattering. For spectral MSE, the entire Stark-split H spectrum emitted by hydrogen neutral beam atoms is recorded and analyzed using a newly refined atomic emission model. A new analysis scheme has been developed to infer both the polarization direction and the magnitude of Stark splitting, from which both the direction and magnitude of the local magnetic field can be derived. For Fast Thomson scattering, two standard commercial flashlamp-pumped Nd:YAG lasers have been upgraded to “pulse-burst” capability. Each laser produces a burst of up to fifteen pulses at repetition rates 1–12.5 kHz, thus enabling recording of the dynamic evolution of the electron temperature profile and electron temperature fluctuations. To further these capabilities, a custom pulse-burst laser system is now being commissioned. This new laser is designed to produce a burst of laser pulses at repetition frequencies 5–250 kHz.

KW - magnetic field

KW - electron temperature

KW - laser pulses

KW - time-resolved measurement

UR - http://os2010.inp.nsk.su/

M3 - Article

VL - 59

SP - 124

EP - 127

JO - Fusion Science and Technology

T2 - Fusion Science and Technology

JF - Fusion Science and Technology

SN - 1536-1055

IS - 11

ER -

Den Hartog DJ, Ambuel JR, Borchardt MT, Caspary KJ, Den Hartog EA, Falkowski AF et al. Advances in time-resolved measurement of magnetic field and electron temperature in low-magnetic-field plasmas. Fusion Science and Technology. 2011 Jan 1;59(11):124-127.