Fast acting eddy current driven valve for massive gas injection on ITER

M. S. Lyttle; L. R. Baylor; J. R. Carmichael; S. K. Combs; M. N. Ericson; N. D. Bull-Ezell; P. W. Fisher; S. J. Meitner; A. Nycz; D. A. Rasmussen; J. M. Shoulders; S. F. Smith; R. J. Warmack; J. B. Wilgen; S. Maruyama; G. Kiss

doi:10.1109/SOFE.2015.7482379

Fast acting eddy current driven valve for massive gas injection on ITER

M. S. Lyttle, L. R. Baylor, J. R. Carmichael, S. K. Combs, M. N. Ericson, N. D. Bull-Ezell, P. W. Fisher, S. J. Meitner, A. Nycz, D. A. Rasmussen, J. M. Shoulders, S. F. Smith, R. J. Warmack, J. B. Wilgen, S. Maruyama, G. Kiss

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Tokamak plasma disruptions present a significant challenge to ITER as they can result in intense heat flux, large forces from halo and eddy currents, and potential first-wall damage from the generation of multi-MeV runaway electrons. Massive gas injection (MGI) of high Z material using fast acting valves is being explored on existing tokamaks and is planned for ITER as a method to evenly distribute the thermal load of the plasma to prevent melting, control the rate of the current decay to minimize mechanical loads, and to suppress the generation of runaway electrons. A fast acting valve and accompanying power supply have been designed and first test articles produced to meet the requirements for a disruption mitigation system on ITER. The test valve incorporates a flyer plate actuator similar to designs deployed on TEXTOR, ASDEX upgrade, and JET [1-3] of a size useful for ITER with special considerations to mitigate the high mechanical forces developed during actuation due to high background magnetic fields. The valve includes a tip design and all-metal valve stem sealing for compatibility with tritium and high neutron and gamma fluxes.

Original language	English
Title of host publication	2015 IEEE 26th Symposium on Fusion Engineering, SOFE 2015
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9781479982646
DOIs	https://doi.org/10.1109/SOFE.2015.7482379
State	Published - May 31 2016
Event	26th IEEE Symposium on Fusion Engineering, SOFE 2015 - Austin, United States Duration: May 31 2015 → Jun 4 2015

Publication series

Name	Proceedings - Symposium on Fusion Engineering
Volume	2016-May

Conference

Conference	26th IEEE Symposium on Fusion Engineering, SOFE 2015
Country/Territory	United States
City	Austin
Period	05/31/15 → 06/4/15

Keywords

disruptions
eddy current
massive gas injection
valve

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1109/SOFE.2015.7482379

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Lyttle, M. S., Baylor, L. R., Carmichael, J. R., Combs, S. K., Ericson, M. N., Bull-Ezell, N. D., Fisher, P. W., Meitner, S. J., Nycz, A., Rasmussen, D. A., Shoulders, J. M., Smith, S. F., Warmack, R. J., Wilgen, J. B., Maruyama, S., & Kiss, G. (2016). Fast acting eddy current driven valve for massive gas injection on ITER. In 2015 IEEE 26th Symposium on Fusion Engineering, SOFE 2015 Article 7482379 (Proceedings - Symposium on Fusion Engineering; Vol. 2016-May). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/SOFE.2015.7482379

@inproceedings{e2b76d0614c34c688dca6bc604f89779,

title = "Fast acting eddy current driven valve for massive gas injection on ITER",

abstract = "Tokamak plasma disruptions present a significant challenge to ITER as they can result in intense heat flux, large forces from halo and eddy currents, and potential first-wall damage from the generation of multi-MeV runaway electrons. Massive gas injection (MGI) of high Z material using fast acting valves is being explored on existing tokamaks and is planned for ITER as a method to evenly distribute the thermal load of the plasma to prevent melting, control the rate of the current decay to minimize mechanical loads, and to suppress the generation of runaway electrons. A fast acting valve and accompanying power supply have been designed and first test articles produced to meet the requirements for a disruption mitigation system on ITER. The test valve incorporates a flyer plate actuator similar to designs deployed on TEXTOR, ASDEX upgrade, and JET [1-3] of a size useful for ITER with special considerations to mitigate the high mechanical forces developed during actuation due to high background magnetic fields. The valve includes a tip design and all-metal valve stem sealing for compatibility with tritium and high neutron and gamma fluxes.",

keywords = "disruptions, eddy current, massive gas injection, valve",

author = "Lyttle, {M. S.} and Baylor, {L. R.} and Carmichael, {J. R.} and Combs, {S. K.} and Ericson, {M. N.} and Bull-Ezell, {N. D.} and Fisher, {P. W.} and Meitner, {S. J.} and A. Nycz and Rasmussen, {D. A.} and Shoulders, {J. M.} and Smith, {S. F.} and Warmack, {R. J.} and Wilgen, {J. B.} and S. Maruyama and G. Kiss",

note = "Publisher Copyright: {\textcopyright} 2015 IEEE.; 26th IEEE Symposium on Fusion Engineering, SOFE 2015 ; Conference date: 31-05-2015 Through 04-06-2015",

year = "2016",

month = may,

day = "31",

doi = "10.1109/SOFE.2015.7482379",

language = "English",

series = "Proceedings - Symposium on Fusion Engineering",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

booktitle = "2015 IEEE 26th Symposium on Fusion Engineering, SOFE 2015",

}

Lyttle, MS, Baylor, LR, Carmichael, JR, Combs, SK, Ericson, MN , Bull-Ezell, ND, Fisher, PW, Meitner, SJ , Nycz, A, Rasmussen, DA, Shoulders, JM, Smith, SF, Warmack, RJ, Wilgen, JB, Maruyama, S & Kiss, G 2016, Fast acting eddy current driven valve for massive gas injection on ITER. in 2015 IEEE 26th Symposium on Fusion Engineering, SOFE 2015., 7482379, Proceedings - Symposium on Fusion Engineering, vol. 2016-May, Institute of Electrical and Electronics Engineers Inc., 26th IEEE Symposium on Fusion Engineering, SOFE 2015, Austin, United States, 05/31/15. https://doi.org/10.1109/SOFE.2015.7482379

Fast acting eddy current driven valve for massive gas injection on ITER. / Lyttle, M. S.; Baylor, L. R.; Carmichael, J. R. et al.
2015 IEEE 26th Symposium on Fusion Engineering, SOFE 2015. Institute of Electrical and Electronics Engineers Inc., 2016. 7482379 (Proceedings - Symposium on Fusion Engineering; Vol. 2016-May).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Fast acting eddy current driven valve for massive gas injection on ITER

AU - Lyttle, M. S.

AU - Baylor, L. R.

AU - Carmichael, J. R.

AU - Combs, S. K.

AU - Ericson, M. N.

AU - Bull-Ezell, N. D.

AU - Fisher, P. W.

AU - Meitner, S. J.

AU - Nycz, A.

AU - Rasmussen, D. A.

AU - Shoulders, J. M.

AU - Smith, S. F.

AU - Warmack, R. J.

AU - Wilgen, J. B.

AU - Maruyama, S.

AU - Kiss, G.

PY - 2016/5/31

Y1 - 2016/5/31

N2 - Tokamak plasma disruptions present a significant challenge to ITER as they can result in intense heat flux, large forces from halo and eddy currents, and potential first-wall damage from the generation of multi-MeV runaway electrons. Massive gas injection (MGI) of high Z material using fast acting valves is being explored on existing tokamaks and is planned for ITER as a method to evenly distribute the thermal load of the plasma to prevent melting, control the rate of the current decay to minimize mechanical loads, and to suppress the generation of runaway electrons. A fast acting valve and accompanying power supply have been designed and first test articles produced to meet the requirements for a disruption mitigation system on ITER. The test valve incorporates a flyer plate actuator similar to designs deployed on TEXTOR, ASDEX upgrade, and JET [1-3] of a size useful for ITER with special considerations to mitigate the high mechanical forces developed during actuation due to high background magnetic fields. The valve includes a tip design and all-metal valve stem sealing for compatibility with tritium and high neutron and gamma fluxes.

AB - Tokamak plasma disruptions present a significant challenge to ITER as they can result in intense heat flux, large forces from halo and eddy currents, and potential first-wall damage from the generation of multi-MeV runaway electrons. Massive gas injection (MGI) of high Z material using fast acting valves is being explored on existing tokamaks and is planned for ITER as a method to evenly distribute the thermal load of the plasma to prevent melting, control the rate of the current decay to minimize mechanical loads, and to suppress the generation of runaway electrons. A fast acting valve and accompanying power supply have been designed and first test articles produced to meet the requirements for a disruption mitigation system on ITER. The test valve incorporates a flyer plate actuator similar to designs deployed on TEXTOR, ASDEX upgrade, and JET [1-3] of a size useful for ITER with special considerations to mitigate the high mechanical forces developed during actuation due to high background magnetic fields. The valve includes a tip design and all-metal valve stem sealing for compatibility with tritium and high neutron and gamma fluxes.

KW - disruptions

KW - eddy current

KW - massive gas injection

KW - valve

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U2 - 10.1109/SOFE.2015.7482379

DO - 10.1109/SOFE.2015.7482379

M3 - Conference contribution

AN - SCOPUS:84978906115

T3 - Proceedings - Symposium on Fusion Engineering

BT - 2015 IEEE 26th Symposium on Fusion Engineering, SOFE 2015

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 26th IEEE Symposium on Fusion Engineering, SOFE 2015

Y2 - 31 May 2015 through 4 June 2015

ER -

Fast acting eddy current driven valve for massive gas injection on ITER

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Keywords

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