Full-orbit and drift calculations of fusion product losses due to explosive fishbones on JET (2024)

JET Contributors (2019). Full-orbit and drift calculations of fusion product losses due to explosive fishbones on JET. Nuclear Fusion, 59(1), Article 016004. https://doi.org/10.1088/1741-4326/aaea1e

JET Contributors. / Full-orbit and drift calculations of fusion product losses due to explosive fishbones on JET. In: Nuclear Fusion. 2019 ; Vol. 59, No. 1.

@article{ed3c512edbd04408a95d1a75f48b449f,

title = "Full-orbit and drift calculations of fusion product losses due to explosive fishbones on JET",

abstract = "Fishbones are ubiquitous in high-performance JET plasmas and are typically considered to be unimportant for scenario design. However, during recent high-performance hybrid scenario experiments, sporadic and explosive fishbone oscillations with sawtooth reconnection were observed coinciding with reduced performance and a main chamber hotspot. Fast ion loss diagnostics showed fusion products ejected from the plasma by the fishbones. We present calculations of the perturbed motion of non-resonant fusion products in the presence of fishbones assuming a fixed linear mode structure and frequency. Using careful reconstruction of the equilibrium and measurements of the perturbation, we show that the measured fishbone spatial structure in these experiments can be well modelled as a linear MHD internal kink mode. Both drift and full-orbit calculations predict losses of fusion products at the same location of the observed hotspot, however the calculated energy content of those losses is negligible and cannot be contributing significantly. The fast ions responsible for the hotspot and the reason for their loss both remain unexplained.",

keywords = "JET, fast particles, fishbone, fusion products, instability, losses, sawteeth",

author = "{JET Contributors} and M. Fitzgerald and J. Buchanan and Sharapov, {S. E.} and Kiptily, {V. G.} and M. Sertoli and G. Szepesi and J. Boom and Akers, {R. J.} and D. King and X. Litaudon and S. Abduallev and M. Abhangi and P. Abreu and M. Afzal and Aggarwal, {K. M.} and T. Ahlgren and Ahn, {J. H.} and L. Aho-Mantila and N. Aiba and M. Airila and R. Albanese and V. Aldred and D. Alegre and E. Alessi and P. Aleynikov and A. Alfier and A. Alkseev and M. Allinson and B. Alper and E. Alves and G. Ambrosino and R. Ambrosino and L. Amicucci and V. Amosov and Sund{\'e}n, {E. Andersson} and M. Angelone and M. Anghel and C. Angioni and L. Appel and C. Appelbee and L. Baylor and T. Biewer and R. Goulding and R. Grove and M. Kaufman and C. Klepper and B. Lomanowski and S. Meitner and J. Risner and Wilson, {H. R.}",

note = "Publisher Copyright: {\textcopyright} EURATOM 2018.",

year = "2019",

doi = "10.1088/1741-4326/aaea1e",

language = "English",

volume = "59",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing",

number = "1",

}

JET Contributors 2019, 'Full-orbit and drift calculations of fusion product losses due to explosive fishbones on JET', Nuclear Fusion, vol. 59, no. 1, 016004. https://doi.org/10.1088/1741-4326/aaea1e

Full-orbit and drift calculations of fusion product losses due to explosive fishbones on JET. / JET Contributors.
In: Nuclear Fusion, Vol. 59, No. 1, 016004, 2019.

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

TY - JOUR

T1 - Full-orbit and drift calculations of fusion product losses due to explosive fishbones on JET

AU - JET Contributors

AU - Fitzgerald, M.

AU - Buchanan, J.

AU - Sharapov, S. E.

AU - Kiptily, V. G.

AU - Sertoli, M.

AU - Szepesi, G.

AU - Boom, J.

AU - Akers, R. J.

AU - King, D.

AU - Litaudon, X.

AU - Abduallev, S.

AU - Abhangi, M.

AU - Abreu, P.

AU - Afzal, M.

AU - Aggarwal, K. M.

AU - Ahlgren, T.

AU - Ahn, J. H.

AU - Aho-Mantila, L.

AU - Aiba, N.

AU - Airila, M.

AU - Albanese, R.

AU - Aldred, V.

AU - Alegre, D.

AU - Alessi, E.

AU - Aleynikov, P.

AU - Alfier, A.

AU - Alkseev, A.

AU - Allinson, M.

AU - Alper, B.

AU - Alves, E.

AU - Ambrosino, G.

AU - Ambrosino, R.

AU - Amicucci, L.

AU - Amosov, V.

AU - Sundén, E. Andersson

AU - Angelone, M.

AU - Anghel, M.

AU - Angioni, C.

AU - Appel, L.

AU - Appelbee, C.

AU - Baylor, L.

AU - Biewer, T.

AU - Goulding, R.

AU - Grove, R.

AU - Kaufman, M.

AU - Klepper, C.

AU - Lomanowski, B.

AU - Meitner, S.

AU - Risner, J.

AU - Wilson, H. R.

N1 - Publisher Copyright:© EURATOM 2018.

PY - 2019

Y1 - 2019

N2 - Fishbones are ubiquitous in high-performance JET plasmas and are typically considered to be unimportant for scenario design. However, during recent high-performance hybrid scenario experiments, sporadic and explosive fishbone oscillations with sawtooth reconnection were observed coinciding with reduced performance and a main chamber hotspot. Fast ion loss diagnostics showed fusion products ejected from the plasma by the fishbones. We present calculations of the perturbed motion of non-resonant fusion products in the presence of fishbones assuming a fixed linear mode structure and frequency. Using careful reconstruction of the equilibrium and measurements of the perturbation, we show that the measured fishbone spatial structure in these experiments can be well modelled as a linear MHD internal kink mode. Both drift and full-orbit calculations predict losses of fusion products at the same location of the observed hotspot, however the calculated energy content of those losses is negligible and cannot be contributing significantly. The fast ions responsible for the hotspot and the reason for their loss both remain unexplained.

AB - Fishbones are ubiquitous in high-performance JET plasmas and are typically considered to be unimportant for scenario design. However, during recent high-performance hybrid scenario experiments, sporadic and explosive fishbone oscillations with sawtooth reconnection were observed coinciding with reduced performance and a main chamber hotspot. Fast ion loss diagnostics showed fusion products ejected from the plasma by the fishbones. We present calculations of the perturbed motion of non-resonant fusion products in the presence of fishbones assuming a fixed linear mode structure and frequency. Using careful reconstruction of the equilibrium and measurements of the perturbation, we show that the measured fishbone spatial structure in these experiments can be well modelled as a linear MHD internal kink mode. Both drift and full-orbit calculations predict losses of fusion products at the same location of the observed hotspot, however the calculated energy content of those losses is negligible and cannot be contributing significantly. The fast ions responsible for the hotspot and the reason for their loss both remain unexplained.

KW - JET

KW - fast particles

KW - fishbone

KW - fusion products

KW - instability

KW - losses

KW - sawteeth

UR - http://www.scopus.com/inward/record.url?scp=85061325475&partnerID=8YFLogxK

U2 - 10.1088/1741-4326/aaea1e

DO - 10.1088/1741-4326/aaea1e

M3 - Article

AN - SCOPUS:85061325475

SN - 0029-5515

VL - 59

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 1

M1 - 016004

ER -

JET Contributors. Full-orbit and drift calculations of fusion product losses due to explosive fishbones on JET. Nuclear Fusion. 2019;59(1):016004. doi: 10.1088/1741-4326/aaea1e