A fast exhaust-gas analyzer for the ITER fusion experiment divertor

C. Christopher Klepper; Eric P. Carlson; John J. Moschella; Robert C. Hazelton; Michael D. Keitz; Walter L. Gardner

doi:10.1109/TPS.2009.2037742

A fast exhaust-gas analyzer for the ITER fusion experiment divertor

C. Christopher Klepper, Eric P. Carlson, John J. Moschella, Robert C. Hazelton, Michael D. Keitz, Walter L. Gardner

Diagnostics and Control

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

This paper presents a first demonstration of a radio-frequency (RF)-excited optical gas analyzer (RF-OGA) designed to quantitatively measure minority species inside the neutralization region of the ITER fusion experiment divertor. The sensor head, which creates its own plasma excitation and plasma light emission, is designed to operate in a strong magnetic field, and the RF coupling leads to bright light emission. It also allows for operation at low voltages, avoiding the radiation-enhanced breakdowns expected when high voltages are present in the ITER environment. Furthermore, the preferred sensor head features full isolation of the metal RF electrodes from the induced plasma. This "electrodeless" operation will permit long operation without frequent maintenance. The testing of a first experimental RF-OGA with an electrodeless design in a strong (̃2-T) magnetic field showed a mostly linear response of the He I-6678 Å line emission to the He concentration in a hydrogen background, which would produce a He concentration measurement accurate to within 2% of the helium-to-hydrogen ratio.

Original language	English
Pages (from-to)	315-319
Number of pages	5
Journal	IEEE Transactions on Plasma Science
Volume	38
Issue number	3 PART 1
DOIs	https://doi.org/10.1109/TPS.2009.2037742
State	Published - Mar 2010

Funding

Manuscript received June 24, 2009; revised October 22, 2009. First published December 31, 2009; current version published March 10, 2010. This work was supported by the U.S. Department of Energy under Award DE-FG02-08ER85200 (Phase I SBIR) to HY-Tech Research Corporation.

Keywords

Divertor
Helium exhaust
Helium removal
ITER
Residual gas analysis

Access to Document

10.1109/TPS.2009.2037742

Cite this

@article{759387aaa3834981b416a4817d4890f5,

title = "A fast exhaust-gas analyzer for the ITER fusion experiment divertor",

abstract = "This paper presents a first demonstration of a radio-frequency (RF)-excited optical gas analyzer (RF-OGA) designed to quantitatively measure minority species inside the neutralization region of the ITER fusion experiment divertor. The sensor head, which creates its own plasma excitation and plasma light emission, is designed to operate in a strong magnetic field, and the RF coupling leads to bright light emission. It also allows for operation at low voltages, avoiding the radiation-enhanced breakdowns expected when high voltages are present in the ITER environment. Furthermore, the preferred sensor head features full isolation of the metal RF electrodes from the induced plasma. This {"}electrodeless{"} operation will permit long operation without frequent maintenance. The testing of a first experimental RF-OGA with an electrodeless design in a strong {\~(}2-T) magnetic field showed a mostly linear response of the He I-6678 {\AA} line emission to the He concentration in a hydrogen background, which would produce a He concentration measurement accurate to within 2% of the helium-to-hydrogen ratio.",

keywords = "Divertor, Helium exhaust, Helium removal, ITER, Residual gas analysis",

author = "Klepper, {C. Christopher} and Carlson, {Eric P.} and Moschella, {John J.} and Hazelton, {Robert C.} and Keitz, {Michael D.} and Gardner, {Walter L.}",

year = "2010",

month = mar,

doi = "10.1109/TPS.2009.2037742",

language = "English",

volume = "38",

pages = "315--319",

journal = "IEEE Transactions on Plasma Science",

issn = "0093-3813",

publisher = "Institute of Electrical and Electronics Engineers",

number = "3 PART 1",

}

TY - JOUR

T1 - A fast exhaust-gas analyzer for the ITER fusion experiment divertor

AU - Klepper, C. Christopher

AU - Carlson, Eric P.

AU - Moschella, John J.

AU - Hazelton, Robert C.

AU - Keitz, Michael D.

AU - Gardner, Walter L.

PY - 2010/3

Y1 - 2010/3

N2 - This paper presents a first demonstration of a radio-frequency (RF)-excited optical gas analyzer (RF-OGA) designed to quantitatively measure minority species inside the neutralization region of the ITER fusion experiment divertor. The sensor head, which creates its own plasma excitation and plasma light emission, is designed to operate in a strong magnetic field, and the RF coupling leads to bright light emission. It also allows for operation at low voltages, avoiding the radiation-enhanced breakdowns expected when high voltages are present in the ITER environment. Furthermore, the preferred sensor head features full isolation of the metal RF electrodes from the induced plasma. This "electrodeless" operation will permit long operation without frequent maintenance. The testing of a first experimental RF-OGA with an electrodeless design in a strong (̃2-T) magnetic field showed a mostly linear response of the He I-6678 Å line emission to the He concentration in a hydrogen background, which would produce a He concentration measurement accurate to within 2% of the helium-to-hydrogen ratio.

AB - This paper presents a first demonstration of a radio-frequency (RF)-excited optical gas analyzer (RF-OGA) designed to quantitatively measure minority species inside the neutralization region of the ITER fusion experiment divertor. The sensor head, which creates its own plasma excitation and plasma light emission, is designed to operate in a strong magnetic field, and the RF coupling leads to bright light emission. It also allows for operation at low voltages, avoiding the radiation-enhanced breakdowns expected when high voltages are present in the ITER environment. Furthermore, the preferred sensor head features full isolation of the metal RF electrodes from the induced plasma. This "electrodeless" operation will permit long operation without frequent maintenance. The testing of a first experimental RF-OGA with an electrodeless design in a strong (̃2-T) magnetic field showed a mostly linear response of the He I-6678 Å line emission to the He concentration in a hydrogen background, which would produce a He concentration measurement accurate to within 2% of the helium-to-hydrogen ratio.

KW - Divertor

KW - Helium exhaust

KW - Helium removal

KW - ITER

KW - Residual gas analysis

UR - http://www.scopus.com/inward/record.url?scp=77955086277&partnerID=8YFLogxK

U2 - 10.1109/TPS.2009.2037742

DO - 10.1109/TPS.2009.2037742

M3 - Article

AN - SCOPUS:77955086277

SN - 0093-3813

VL - 38

SP - 315

EP - 319

JO - IEEE Transactions on Plasma Science

JF - IEEE Transactions on Plasma Science

IS - 3 PART 1

ER -

A fast exhaust-gas analyzer for the ITER fusion experiment divertor

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this