Mitigation of disruption electro-magnetic load with SPI on JET-ILW

JET Contributorsa EUROfusion Consortium

Mitigation of disruption electro-magnetic load with SPI on JET-ILW

JET Contributorsa EUROfusion Consortium

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

1 Scopus citations

Abstract

Small (0.1 g) pellet C with Ne/(Ne+D) = 0.6 provides good mitigation for Ip < 2 MA Ohmic plasmas. Pellets B are not fully ablated and assimilated by the end of CQ, therefore medium pellet B (and large pellet A) are unnecessarily big to mitigate Ohmic plasmas with I_p< 3 MA. There is a strong dependence of CQ duration on Ne fraction. SPI effectiveness (in terms of t80-20) does not depend on pre-disruptive I_p(< 3.0 MA, pellet B). CQ duration does not depend on #Ne atoms (= pellet size) for Ne/(Ne+D) > 0.5. SPI effectiveness (in terms of τ_80-20) does not depend on plasma status: it is effective in normal ("healthy") plasma i.e. not prone to disruption as well as postdisruptive plasma. SPI reduced vertical vessel reaction forces relative to unmitigated disruptions. Effectiveness is comparable with MGI. Pellet C (60% Ne) arrival stopped vertical movement of plasma, hence SPI prevents AVDE, when large vessel asymmetric (radial) displacement occurs.

Original language	English
Title of host publication	47th EPS Conference on Plasma Physics, EPS 2021
Publisher	European Physical Society (EPS)
Pages	205-208
Number of pages	4
ISBN (Electronic)	9781713837046
State	Published - 2021
Event	47th EPS Conference on Plasma Physics, EPS 2021 - Sitges, Spain Duration: Jun 21 2021 → Jun 25 2021

Publication series

Name	47th EPS Conference on Plasma Physics, EPS 2021
Volume	2021-June

Conference

Conference	47th EPS Conference on Plasma Physics, EPS 2021
Country/Territory	Spain
City	Sitges
Period	06/21/21 → 06/25/21

Funding

Small (0.1 g) pellet C with Ne/(Ne+D) = 0.6 provides good mitigation for Ip < 2 MA Ohmic plasmas. Pellets B are not fully ablated and assimilated by the end of CQ, therefore medium pellet B (and large pellet A) are unnecessarily big to mitigate Ohmic plasmas with Ip < 3 MA. There is a strong dependence of CQ duration on Ne fraction. SPI effectiveness (in terms of τ80-20) does not depend on pre-disruptive Ip (< 3.0 MA, pellet B). CQ duration does not depend on #Ne atoms (= pellet size) for Ne/(Ne+D) > 0.5. SPI effectiveness (in terms of τ80-20) does not depend on plasma status: it is effective in normal (“healthy”) plasma i.e. not prone to disruption as well as post-disruptive plasma. SPI reduced vertical vessel reaction forces relative to unmitigated disruptions. Effectiveness is comparable with MGI. Pellet C (60% Ne) arrival stopped vertical movement of plasma, hence SPI prevents AVDE, when large vessel asymmetric (radial) displacement occurs. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 and 2019-2020 under grant agreement No 633053 and from the RCUK Energy Programme [EP/T012250/1]. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work received funding from the ITER Organization. ITER is the Nuclear Facility INB no. 174. This paper explores physics processes during the plasma operation of the tokamak when disruptions take place; nevertheless, the nuclear operator is not constrained by the results presented here. The views and opinions expressed herein do not necessarily reflect those of the ITER Organization.

Funders	Funder number
Euratom research and training programme 2014-2018	633053
ITER Organization
Research Councils UK	EP/T012250/1

Cite this

@inproceedings{fc1e228e1ce34e228ef0597959619980,

title = "Mitigation of disruption electro-magnetic load with SPI on JET-ILW",

abstract = "Small (0.1 g) pellet C with Ne/(Ne+D) = 0.6 provides good mitigation for Ip < 2 MA Ohmic plasmas. Pellets B are not fully ablated and assimilated by the end of CQ, therefore medium pellet B (and large pellet A) are unnecessarily big to mitigate Ohmic plasmas with Ip< 3 MA. There is a strong dependence of CQ duration on Ne fraction. SPI effectiveness (in terms of t80-20) does not depend on pre-disruptive Ip(< 3.0 MA, pellet B). CQ duration does not depend on #Ne atoms (= pellet size) for Ne/(Ne+D) > 0.5. SPI effectiveness (in terms of τ80-20) does not depend on plasma status: it is effective in normal ({"}healthy{"}) plasma i.e. not prone to disruption as well as postdisruptive plasma. SPI reduced vertical vessel reaction forces relative to unmitigated disruptions. Effectiveness is comparable with MGI. Pellet C (60% Ne) arrival stopped vertical movement of plasma, hence SPI prevents AVDE, when large vessel asymmetric (radial) displacement occurs.",

author = "{JET Contributorsa EUROfusion Consortium} and Gerasimov, {S. N.} and P. Abreu and Baranov, {Yu F.} and Baylor, {L. R.} and A. Boboc and Carvalho, {I. S.} and Coffey, {I. H.} and D. Craven and V. Huber and S. Jachmich and E. Joffrin and Krasheninnikov, {S. I.} and U. Kruezi and M. Lehnen and Lomas, {P. J.} and A. Manzanares and M. Maslov and E. Matveeva and G. Pautasso and A. Peacock and S. Silburn and Smirnov, {R. D.} and C. Stuart and H. Sun and D. Shiraki and R. Sweeney and J. Wilson and Zakharov, {L. E.}",

note = "Publisher Copyright: {\textcopyright} 2021 47th EPS Conference on Plasma Physics, EPS 2021. All right reserved.; 47th EPS Conference on Plasma Physics, EPS 2021 ; Conference date: 21-06-2021 Through 25-06-2021",

year = "2021",

language = "English",

series = "47th EPS Conference on Plasma Physics, EPS 2021",

publisher = "European Physical Society (EPS)",

pages = "205--208",

booktitle = "47th EPS Conference on Plasma Physics, EPS 2021",

}

Mitigation of disruption electro-magnetic load with SPI on JET-ILW. / JET Contributorsa EUROfusion Consortium.
47th EPS Conference on Plasma Physics, EPS 2021. European Physical Society (EPS), 2021. p. 205-208 (47th EPS Conference on Plasma Physics, EPS 2021; Vol. 2021-June).

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

TY - GEN

T1 - Mitigation of disruption electro-magnetic load with SPI on JET-ILW

AU - JET Contributorsa EUROfusion Consortium

AU - Gerasimov, S. N.

AU - Abreu, P.

AU - Baranov, Yu F.

AU - Baylor, L. R.

AU - Boboc, A.

AU - Carvalho, I. S.

AU - Coffey, I. H.

AU - Craven, D.

AU - Huber, V.

AU - Jachmich, S.

AU - Joffrin, E.

AU - Krasheninnikov, S. I.

AU - Kruezi, U.

AU - Lehnen, M.

AU - Lomas, P. J.

AU - Manzanares, A.

AU - Maslov, M.

AU - Matveeva, E.

AU - Pautasso, G.

AU - Peacock, A.

AU - Silburn, S.

AU - Smirnov, R. D.

AU - Stuart, C.

AU - Sun, H.

AU - Shiraki, D.

AU - Sweeney, R.

AU - Wilson, J.

AU - Zakharov, L. E.

PY - 2021

Y1 - 2021

N2 - Small (0.1 g) pellet C with Ne/(Ne+D) = 0.6 provides good mitigation for Ip < 2 MA Ohmic plasmas. Pellets B are not fully ablated and assimilated by the end of CQ, therefore medium pellet B (and large pellet A) are unnecessarily big to mitigate Ohmic plasmas with Ip< 3 MA. There is a strong dependence of CQ duration on Ne fraction. SPI effectiveness (in terms of t80-20) does not depend on pre-disruptive Ip(< 3.0 MA, pellet B). CQ duration does not depend on #Ne atoms (= pellet size) for Ne/(Ne+D) > 0.5. SPI effectiveness (in terms of τ80-20) does not depend on plasma status: it is effective in normal ("healthy") plasma i.e. not prone to disruption as well as postdisruptive plasma. SPI reduced vertical vessel reaction forces relative to unmitigated disruptions. Effectiveness is comparable with MGI. Pellet C (60% Ne) arrival stopped vertical movement of plasma, hence SPI prevents AVDE, when large vessel asymmetric (radial) displacement occurs.

AB - Small (0.1 g) pellet C with Ne/(Ne+D) = 0.6 provides good mitigation for Ip < 2 MA Ohmic plasmas. Pellets B are not fully ablated and assimilated by the end of CQ, therefore medium pellet B (and large pellet A) are unnecessarily big to mitigate Ohmic plasmas with Ip< 3 MA. There is a strong dependence of CQ duration on Ne fraction. SPI effectiveness (in terms of t80-20) does not depend on pre-disruptive Ip(< 3.0 MA, pellet B). CQ duration does not depend on #Ne atoms (= pellet size) for Ne/(Ne+D) > 0.5. SPI effectiveness (in terms of τ80-20) does not depend on plasma status: it is effective in normal ("healthy") plasma i.e. not prone to disruption as well as postdisruptive plasma. SPI reduced vertical vessel reaction forces relative to unmitigated disruptions. Effectiveness is comparable with MGI. Pellet C (60% Ne) arrival stopped vertical movement of plasma, hence SPI prevents AVDE, when large vessel asymmetric (radial) displacement occurs.

UR - http://www.scopus.com/inward/record.url?scp=85119499544&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:85119499544

T3 - 47th EPS Conference on Plasma Physics, EPS 2021

SP - 205

EP - 208

BT - 47th EPS Conference on Plasma Physics, EPS 2021

PB - European Physical Society (EPS)

T2 - 47th EPS Conference on Plasma Physics, EPS 2021

Y2 - 21 June 2021 through 25 June 2021

ER -

Mitigation of disruption electro-magnetic load with SPI on JET-ILW

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