Magnetic and thermal characterization of an ELM Simulating Plasma (ESP) with helicon pre-ionization

B. C. Masters, T. K. Gray, David N Ruzic, R. Stubbers

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Edge Localized Modes (ELMs) continue to be an obstacle in magnetic confinement fusion. The simulation of such ELM events using a conical theta pinch serves as a means to explore methods to manage these events in future experiments. For the purposes of pre-ionization before the pinch, a 100 - 200 W helicon source, (at pressures between 5 - 100 mTorr, in either hydrogen or argon) is employed. Plasma pinching is the result of pulsed current through a single turn conical copper coil from discharge of high voltage capacitors. Direction of current flow around the coil and hence the magnetic field direction from pinching, as compared to the steady state magnetic field, is such that the system lends itself to a field reversed configuration (FRC). Axial magnetic field measurements during the theta pinch at the location of the coil as well as at a target downstream are accomplished using a B-dot probe array. Steady state magnetic field topology was configured in order to optimize the transfer of the pinched plasma from the pinch coil to the target, as well as to simulate tokamak-level magnetic field strengths. Thermal heating of a small target by the RF and pinched plasmas as a means of measuring plasma energy deposition augments data taken using other diagnostics. This heating is observed using an RF-compensated in-situ thermocouple probe attached to the target assembly. Power and energy densities are estimated. RF power and capacitor discharge voltage are varied to illustrate target heating parameters. Optical spectroscopy is used for atomic line spectra measurements. The results of these experiments with the imposed conditions are discussed.

Original languageEnglish (US)
Title of host publication21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)142440150X, 9781424401505
DOIs
StatePublished - Jan 1 2005
Event21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05 - Knoxville, TN, United States
Duration: Sep 26 2005Sep 29 2005

Publication series

NameProceedings - Symposium on Fusion Engineering

Other

Other21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05
CountryUnited States
CityKnoxville, TN
Period9/26/059/29/05

Fingerprint

Helicons
Ionization
Magnetic fields
Plasmas
Heating
Capacitors
Magnetic field measurement
Electric potential
Thermocouples
Argon
Fusion reactions
Experiments
Topology
Copper
Hydrogen
Hot Temperature

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering

Cite this

Masters, B. C., Gray, T. K., Ruzic, D. N., & Stubbers, R. (2005). Magnetic and thermal characterization of an ELM Simulating Plasma (ESP) with helicon pre-ionization. In 21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05 [4019017] (Proceedings - Symposium on Fusion Engineering). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/FUSION.2005.252983

Magnetic and thermal characterization of an ELM Simulating Plasma (ESP) with helicon pre-ionization. / Masters, B. C.; Gray, T. K.; Ruzic, David N; Stubbers, R.

21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05. Institute of Electrical and Electronics Engineers Inc., 2005. 4019017 (Proceedings - Symposium on Fusion Engineering).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Masters, BC, Gray, TK, Ruzic, DN & Stubbers, R 2005, Magnetic and thermal characterization of an ELM Simulating Plasma (ESP) with helicon pre-ionization. in 21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05., 4019017, Proceedings - Symposium on Fusion Engineering, Institute of Electrical and Electronics Engineers Inc., 21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05, Knoxville, TN, United States, 9/26/05. https://doi.org/10.1109/FUSION.2005.252983
Masters BC, Gray TK, Ruzic DN, Stubbers R. Magnetic and thermal characterization of an ELM Simulating Plasma (ESP) with helicon pre-ionization. In 21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05. Institute of Electrical and Electronics Engineers Inc. 2005. 4019017. (Proceedings - Symposium on Fusion Engineering). https://doi.org/10.1109/FUSION.2005.252983
Masters, B. C. ; Gray, T. K. ; Ruzic, David N ; Stubbers, R. / Magnetic and thermal characterization of an ELM Simulating Plasma (ESP) with helicon pre-ionization. 21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05. Institute of Electrical and Electronics Engineers Inc., 2005. (Proceedings - Symposium on Fusion Engineering).
@inproceedings{9701b82546a1498db7ed28c3fa887b28,
title = "Magnetic and thermal characterization of an ELM Simulating Plasma (ESP) with helicon pre-ionization",
abstract = "Edge Localized Modes (ELMs) continue to be an obstacle in magnetic confinement fusion. The simulation of such ELM events using a conical theta pinch serves as a means to explore methods to manage these events in future experiments. For the purposes of pre-ionization before the pinch, a 100 - 200 W helicon source, (at pressures between 5 - 100 mTorr, in either hydrogen or argon) is employed. Plasma pinching is the result of pulsed current through a single turn conical copper coil from discharge of high voltage capacitors. Direction of current flow around the coil and hence the magnetic field direction from pinching, as compared to the steady state magnetic field, is such that the system lends itself to a field reversed configuration (FRC). Axial magnetic field measurements during the theta pinch at the location of the coil as well as at a target downstream are accomplished using a B-dot probe array. Steady state magnetic field topology was configured in order to optimize the transfer of the pinched plasma from the pinch coil to the target, as well as to simulate tokamak-level magnetic field strengths. Thermal heating of a small target by the RF and pinched plasmas as a means of measuring plasma energy deposition augments data taken using other diagnostics. This heating is observed using an RF-compensated in-situ thermocouple probe attached to the target assembly. Power and energy densities are estimated. RF power and capacitor discharge voltage are varied to illustrate target heating parameters. Optical spectroscopy is used for atomic line spectra measurements. The results of these experiments with the imposed conditions are discussed.",
author = "Masters, {B. C.} and Gray, {T. K.} and Ruzic, {David N} and R. Stubbers",
year = "2005",
month = "1",
day = "1",
doi = "10.1109/FUSION.2005.252983",
language = "English (US)",
isbn = "142440150X",
series = "Proceedings - Symposium on Fusion Engineering",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05",
address = "United States",

}

TY - GEN

T1 - Magnetic and thermal characterization of an ELM Simulating Plasma (ESP) with helicon pre-ionization

AU - Masters, B. C.

AU - Gray, T. K.

AU - Ruzic, David N

AU - Stubbers, R.

PY - 2005/1/1

Y1 - 2005/1/1

N2 - Edge Localized Modes (ELMs) continue to be an obstacle in magnetic confinement fusion. The simulation of such ELM events using a conical theta pinch serves as a means to explore methods to manage these events in future experiments. For the purposes of pre-ionization before the pinch, a 100 - 200 W helicon source, (at pressures between 5 - 100 mTorr, in either hydrogen or argon) is employed. Plasma pinching is the result of pulsed current through a single turn conical copper coil from discharge of high voltage capacitors. Direction of current flow around the coil and hence the magnetic field direction from pinching, as compared to the steady state magnetic field, is such that the system lends itself to a field reversed configuration (FRC). Axial magnetic field measurements during the theta pinch at the location of the coil as well as at a target downstream are accomplished using a B-dot probe array. Steady state magnetic field topology was configured in order to optimize the transfer of the pinched plasma from the pinch coil to the target, as well as to simulate tokamak-level magnetic field strengths. Thermal heating of a small target by the RF and pinched plasmas as a means of measuring plasma energy deposition augments data taken using other diagnostics. This heating is observed using an RF-compensated in-situ thermocouple probe attached to the target assembly. Power and energy densities are estimated. RF power and capacitor discharge voltage are varied to illustrate target heating parameters. Optical spectroscopy is used for atomic line spectra measurements. The results of these experiments with the imposed conditions are discussed.

AB - Edge Localized Modes (ELMs) continue to be an obstacle in magnetic confinement fusion. The simulation of such ELM events using a conical theta pinch serves as a means to explore methods to manage these events in future experiments. For the purposes of pre-ionization before the pinch, a 100 - 200 W helicon source, (at pressures between 5 - 100 mTorr, in either hydrogen or argon) is employed. Plasma pinching is the result of pulsed current through a single turn conical copper coil from discharge of high voltage capacitors. Direction of current flow around the coil and hence the magnetic field direction from pinching, as compared to the steady state magnetic field, is such that the system lends itself to a field reversed configuration (FRC). Axial magnetic field measurements during the theta pinch at the location of the coil as well as at a target downstream are accomplished using a B-dot probe array. Steady state magnetic field topology was configured in order to optimize the transfer of the pinched plasma from the pinch coil to the target, as well as to simulate tokamak-level magnetic field strengths. Thermal heating of a small target by the RF and pinched plasmas as a means of measuring plasma energy deposition augments data taken using other diagnostics. This heating is observed using an RF-compensated in-situ thermocouple probe attached to the target assembly. Power and energy densities are estimated. RF power and capacitor discharge voltage are varied to illustrate target heating parameters. Optical spectroscopy is used for atomic line spectra measurements. The results of these experiments with the imposed conditions are discussed.

UR - http://www.scopus.com/inward/record.url?scp=34547773209&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34547773209&partnerID=8YFLogxK

U2 - 10.1109/FUSION.2005.252983

DO - 10.1109/FUSION.2005.252983

M3 - Conference contribution

AN - SCOPUS:34547773209

SN - 142440150X

SN - 9781424401505

T3 - Proceedings - Symposium on Fusion Engineering

BT - 21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05

PB - Institute of Electrical and Electronics Engineers Inc.

ER -