Overview of physics results from MAST upgrade towards core-pedestal-exhaust integration

J. R. Harrison; A. Aboutaleb; S. Ahmed; M. Aljunid; S. Y. Allan; H. Anand; Y. Andrew; L. C. Appel; A. Ash; J. Ashton; O. Bachmann; M. Barnes; B. Barrett; D. Baver; D. Beckett; J. Bennett; J. Berkery; M. Bernert; W. Boeglin; C. Bowman; J. Bradley; D. Brida; P. K. Browning; D. Brunetti; P. Bryant; J. Bryant; J. Buchanan; N. Bulmer; A. Carruthers; M. Cecconello; Z. P. Chen; J. Clark; C. Cowley; M. Coy; N. Crocker; G. Cunningham; I. Cziegler; T. Da Assuncao; Y. Damizia; P. Davies; I. E. Day; G. L. Derks; S. Dixon; R. Doyle; M. Dreval; M. Dunne; B. P. Duval; T. Eagles; J. Edmond; H. El-Haroun; S. D. Elmore; Y. Enters; M. Faitsch; F. Federici; N. Fedorczak; F. Felici; A. R. Field; M. Fitzgerald; I. Fitzgerald; R. Fitzpatrick; L. Frassinetti; W. Fuller; D. Gahle; J. Galdon-Quiroga; L. Garzotti; S. Gee; T. Gheorghiu; S. Gibson; K. J. Gibson; C. Giroud; D. Greenhouse; V. H. Hall-Chen; C. J. Ham; R. Harrison; S. S. Henderson; C. Hickling; B. Hnat; L. Howlett; J. Hughes; R. Hussain; K. Imada; P. Jacquet; P. Jepson; B. Kandan; I. Katramados; Y. O. Kazakov; D. King; R. King; A. Kirk; M. Knolker; M. Kochan; L. Kogan; B. Kool; M. Kotschenreuther; M. Lees; A. W. Leonard; G. Liddiard; B. Lipschultz; Y. Q. Liu; B. A. Lomanowski; N. Lonigro; J. Lore; J. Lovell; S. Mahajan; F. Maiden; C. Man-Friel; F. Mansfield; S. Marsden; R. Martin; S. Mazzi; R. McAdams; G. McArdle; K. G. McClements; J. McClenaghan; D. McConville; K. McKay; C. McKnight; P. McKnight; A. McLean; B. F. McMillan; A. McShee; J. Measures; N. Mehay; C. A. Michael; F. Militello; D. Morbey; S. Mordijck; D. Moulton; O. Myatra; A. O. Nelson; M. Nicassio; M. G. O'Mullane; H. J.C. Oliver; P. Ollus; T. Osborne; N. Osborne; E. Parr; B. Parry; B. S. Patel; D. Payne; C. Paz-Soldan; A. Phelps; L. Piron; C. Piron; G. Prechel; M. Price; B. Pritchard; R. Proudfoot; H. Reimerdes; T. Rhodes; P. Richardson; J. Riquezes; J. F. Rivero-Rodriguez; C. M. Roach; M. Robson; K. Ronald; E. Rose; P. Ryan; D. Ryan; S. Saarelma; S. Sabbagh; R. Sarwar; P. Saunders; O. Sauter; R. Scannell; T. Schuett; R. Seath; R. Sharma; P. Shi; B. Sieglin; M. Simmonds; J. Smith; A. Smith; V. A. Soukhanovskii; D. Speirs; G. Staebler; R. Stephen; P. Stevenson; J. Stobbs; M. Stott; C. Stroud; C. Tame; C. Theiler; N. Thomas-Davies; A. J. Thornton; M. Tobin; M. Vallar; R. G.L. Vann; L. Velarde; K. Verhaegh; E. Viezzer; C. Vincent; G. Voss; M. Warr; W. Wehner; S. Wiesen; T. A. Wijkamp; D. Wilkins; T. Williams; T. Wilson; H. R. Wilson; H. Wong; M. Wood; V. Zamkovska

doi:10.1088/1741-4326/ad6011

Overview of physics results from MAST upgrade towards core-pedestal-exhaust integration

J. R. Harrison
, A. Aboutaleb
, S. Ahmed
, M. Aljunid
, S. Y. Allan
, H. Anand
, Y. Andrew
, L. C. Appel
, A. Ash
, J. Ashton
, O. Bachmann
, M. Barnes
, B. Barrett
, D. Baver
, D. Beckett
, J. Bennett
, J. Berkery
, M. Bernert
, W. Boeglin
, C. Bowman

J. Bradley, D. Brida, P. K. Browning, D. Brunetti, P. Bryant, J. Bryant, J. Buchanan, N. Bulmer, A. Carruthers, M. Cecconello, Z. P. Chen, J. Clark, C. Cowley, M. Coy, N. Crocker, G. Cunningham, I. Cziegler, T. Da Assuncao, Y. Damizia, P. Davies, I. E. Day, G. L. Derks, S. Dixon, R. Doyle, M. Dreval, M. Dunne, B. P. Duval, T. Eagles, J. Edmond, H. El-Haroun, S. D. Elmore, Y. Enters, M. Faitsch, F. Federici, N. Fedorczak, F. Felici, A. R. Field, M. Fitzgerald, I. Fitzgerald, R. Fitzpatrick, L. Frassinetti, W. Fuller, D. Gahle, J. Galdon-Quiroga, L. Garzotti, S. Gee, T. Gheorghiu, S. Gibson, K. J. Gibson, C. Giroud, D. Greenhouse, V. H. Hall-Chen, C. J. Ham, R. Harrison, S. S. Henderson, C. Hickling, B. Hnat, L. Howlett, J. Hughes, R. Hussain, K. Imada, P. Jacquet, P. Jepson, B. Kandan, I. Katramados, Y. O. Kazakov, D. King, R. King, A. Kirk, M. Knolker, M. Kochan, L. Kogan, B. Kool, M. Kotschenreuther, M. Lees, A. W. Leonard, G. Liddiard, B. Lipschultz, Y. Q. Liu, B. A. Lomanowski, N. Lonigro, J. Lore, J. Lovell, S. Mahajan, F. Maiden, C. Man-Friel, F. Mansfield, S. Marsden, R. Martin, S. Mazzi, R. McAdams, G. McArdle, K. G. McClements, J. McClenaghan, D. McConville, K. McKay, C. McKnight, P. McKnight, A. McLean, B. F. McMillan, A. McShee, J. Measures, N. Mehay, C. A. Michael, F. Militello, D. Morbey, S. Mordijck, D. Moulton, O. Myatra, A. O. Nelson, M. Nicassio, M. G. O'Mullane, H. J.C. Oliver, P. Ollus, T. Osborne, N. Osborne, E. Parr, B. Parry, B. S. Patel, D. Payne, C. Paz-Soldan, A. Phelps, L. Piron, C. Piron, G. Prechel, M. Price, B. Pritchard, R. Proudfoot, H. Reimerdes, T. Rhodes, P. Richardson, J. Riquezes, J. F. Rivero-Rodriguez, C. M. Roach, M. Robson, K. Ronald, E. Rose, P. Ryan, D. Ryan, S. Saarelma, S. Sabbagh, R. Sarwar, P. Saunders, O. Sauter, R. Scannell, T. Schuett, R. Seath, R. Sharma, P. Shi, B. Sieglin, M. Simmonds, J. Smith, A. Smith, V. A. Soukhanovskii, D. Speirs, G. Staebler, R. Stephen, P. Stevenson, J. Stobbs, M. Stott, C. Stroud, C. Tame, C. Theiler, N. Thomas-Davies, A. J. Thornton, M. Tobin, M. Vallar, R. G.L. Vann, L. Velarde, K. Verhaegh, E. Viezzer, C. Vincent, G. Voss, M. Warr, W. Wehner, S. Wiesen, T. A. Wijkamp, D. Wilkins, T. Williams, T. Wilson, H. R. Wilson, H. Wong, M. Wood, V. Zamkovska

Laboratory for Plasma Physics

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UiT the Arctic University of Norway
General Atomics
Imperial College London
University of Oxford
Astrodel LLC
Princeton Plasma Physics Laboratory
Max Planck Institute for Plasma Physics
University of Liverpool
University of Manchester
Durham University
University of Texas at Austin
University of York
University of California, Los Angeles
FOM Institute DIFFER
Eindhoven University of Technology
Dublin City University
National Science Center Kharkiv Institute of Physics and Technology
École Polytechnique Fédérale de Lausanne
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27 Citaten (Scopus)

Samenvatting

Recent results from MAST Upgrade are presented, emphasising understanding the capabilities of this new device and deepening understanding of key physics issues for the operation of ITER and the design of future fusion power plants. The impact of MHD instabilities on fast ion confinement have been studied, including the first observation of fast ion losses correlated with Compressional and Global Alfvén Eigenmodes. High-performance plasma scenarios have been developed by tailoring the early plasma current ramp phase to avoid internal reconnection events, resulting in a more monotonic q profile with low central shear. The impact of m/n = 3/2, 2/1 and 1/1 modes on thermal plasma confinement and rotation profiles has been quantified, and scenarios optimised to avoid them have transiently reached values of normalised beta approaching 4.2. In pedestal and ELM physics, a maximum pedestal top temperature of ∼350 eV has been achieved, exceeding the value achieved on MAST at similar heating power. Mitigation of type-I ELMs with n = 1 RMPs has been observed. Studies of plasma exhaust have concentrated on comparing conventional and Super-X divertor configurations, while X-point target, X-divertor and snowflake configurations have been developed and studied in parallel. In L-mode discharges, the separatrix density required to detach the outer divertors is approximately a factor 2 lower in the Super-X than the conventional configuration, in agreement with simulations. Detailed analysis of spectroscopy data from studies of the Super-X configuration reveal the importance of including plasma-molecule interactions and D2 Fulcher band emission to properly quantify the rates of ionisation, plasma-molecule interactions and volumetric recombination processes governing divertor detachment. In H-mode with conventional and Super-X configurations, the outer divertors are attached in the former and detached in the latter with no impact on core or pedestal confinement.

Originele taal-2	Engels
Artikelnummer	112017
Tijdschrift	Nuclear Fusion
Volume	64
Nummer van het tijdschrift	11
DOI's	https://doi.org/10.1088/1741-4326/ad6011
Status	Gepubliceerd - 1 nov 2024

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10.1088/1741-4326/ad6011

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Harrison, J. R., Aboutaleb, A., Ahmed, S., Aljunid, M., Allan, S. Y., Anand, H., Andrew, Y., Appel, L. C., Ash, A., Ashton, J., Bachmann, O., Barnes, M., Barrett, B., Baver, D., Beckett, D., Bennett, J., Berkery, J., Bernert, M., Boeglin, W., ... Zamkovska, V. (2024). Overview of physics results from MAST upgrade towards core-pedestal-exhaust integration. Nuclear Fusion, 64(11), Artikel 112017. https://doi.org/10.1088/1741-4326/ad6011

@article{690cae1949814821a675e72ebc3bd8fb,

title = "Overview of physics results from MAST upgrade towards core-pedestal-exhaust integration",

abstract = "Recent results from MAST Upgrade are presented, emphasising understanding the capabilities of this new device and deepening understanding of key physics issues for the operation of ITER and the design of future fusion power plants. The impact of MHD instabilities on fast ion confinement have been studied, including the first observation of fast ion losses correlated with Compressional and Global Alfv{\'e}n Eigenmodes. High-performance plasma scenarios have been developed by tailoring the early plasma current ramp phase to avoid internal reconnection events, resulting in a more monotonic q profile with low central shear. The impact of m/n = 3/2, 2/1 and 1/1 modes on thermal plasma confinement and rotation profiles has been quantified, and scenarios optimised to avoid them have transiently reached values of normalised beta approaching 4.2. In pedestal and ELM physics, a maximum pedestal top temperature of ∼350 eV has been achieved, exceeding the value achieved on MAST at similar heating power. Mitigation of type-I ELMs with n = 1 RMPs has been observed. Studies of plasma exhaust have concentrated on comparing conventional and Super-X divertor configurations, while X-point target, X-divertor and snowflake configurations have been developed and studied in parallel. In L-mode discharges, the separatrix density required to detach the outer divertors is approximately a factor 2 lower in the Super-X than the conventional configuration, in agreement with simulations. Detailed analysis of spectroscopy data from studies of the Super-X configuration reveal the importance of including plasma-molecule interactions and D2 Fulcher band emission to properly quantify the rates of ionisation, plasma-molecule interactions and volumetric recombination processes governing divertor detachment. In H-mode with conventional and Super-X configurations, the outer divertors are attached in the former and detached in the latter with no impact on core or pedestal confinement.",

keywords = "MAST upgrade, alternative divertors, exhaust, fast ions, integrated scenarios, pedestal",

author = "Harrison, \{J. R.\} and A. Aboutaleb and S. Ahmed and M. Aljunid and Allan, \{S. Y.\} and H. Anand and Y. Andrew and Appel, \{L. C.\} and A. Ash and J. Ashton and O. Bachmann and M. Barnes and B. Barrett and D. Baver and D. Beckett and J. Bennett and J. Berkery and M. Bernert and W. Boeglin and C. Bowman and J. Bradley and D. Brida and Browning, \{P. K.\} and D. Brunetti and P. Bryant and J. Bryant and J. Buchanan and N. Bulmer and A. Carruthers and M. Cecconello and Chen, \{Z. P.\} and J. Clark and C. Cowley and M. Coy and N. Crocker and G. Cunningham and I. Cziegler and \{Da Assuncao\}, T. and Y. Damizia and P. Davies and Day, \{I. E.\} and Derks, \{G. L.\} and S. Dixon and R. Doyle and M. Dreval and M. Dunne and Duval, \{B. P.\} and T. Eagles and J. Edmond and H. El-Haroun and Elmore, \{S. D.\} and Y. Enters and M. Faitsch and F. Federici and N. Fedorczak and F. Felici and Field, \{A. R.\} and M. Fitzgerald and I. Fitzgerald and R. Fitzpatrick and L. Frassinetti and W. Fuller and D. Gahle and J. Galdon-Quiroga and L. Garzotti and S. Gee and T. Gheorghiu and S. Gibson and Gibson, \{K. J.\} and C. Giroud and D. Greenhouse and Hall-Chen, \{V. H.\} and Ham, \{C. J.\} and R. Harrison and Henderson, \{S. S.\} and C. Hickling and B. Hnat and L. Howlett and J. Hughes and R. Hussain and K. Imada and P. Jacquet and P. Jepson and B. Kandan and I. Katramados and Kazakov, \{Y. O.\} and D. King and R. King and A. Kirk and M. Knolker and M. Kochan and L. Kogan and B. Kool and M. Kotschenreuther and M. Lees and Leonard, \{A. W.\} and G. Liddiard and B. Lipschultz and Liu, \{Y. Q.\} and Lomanowski, \{B. A.\} and N. Lonigro and J. Lore and J. Lovell and S. Mahajan and F. Maiden and C. Man-Friel and F. Mansfield and S. Marsden and R. Martin and S. Mazzi and R. McAdams and G. McArdle and McClements, \{K. G.\} and J. McClenaghan and D. McConville and K. McKay and C. McKnight and P. McKnight and A. McLean and McMillan, \{B. F.\} and A. McShee and J. Measures and N. Mehay and Michael, \{C. A.\} and F. Militello and D. Morbey and S. Mordijck and D. Moulton and O. Myatra and Nelson, \{A. O.\} and M. Nicassio and O'Mullane, \{M. G.\} and Oliver, \{H. J.C.\} and P. Ollus and T. Osborne and N. Osborne and E. Parr and B. Parry and Patel, \{B. S.\} and D. Payne and C. Paz-Soldan and A. Phelps and L. Piron and C. Piron and G. Prechel and M. Price and B. Pritchard and R. Proudfoot and H. Reimerdes and T. Rhodes and P. Richardson and J. Riquezes and Rivero-Rodriguez, \{J. F.\} and Roach, \{C. M.\} and M. Robson and K. Ronald and E. Rose and P. Ryan and D. Ryan and S. Saarelma and S. Sabbagh and R. Sarwar and P. Saunders and O. Sauter and R. Scannell and T. Schuett and R. Seath and R. Sharma and P. Shi and B. Sieglin and M. Simmonds and J. Smith and A. Smith and Soukhanovskii, \{V. A.\} and D. Speirs and G. Staebler and R. Stephen and P. Stevenson and J. Stobbs and M. Stott and C. Stroud and C. Tame and C. Theiler and N. Thomas-Davies and Thornton, \{A. J.\} and M. Tobin and M. Vallar and Vann, \{R. G.L.\} and L. Velarde and K. Verhaegh and E. Viezzer and C. Vincent and G. Voss and M. Warr and W. Wehner and S. Wiesen and Wijkamp, \{T. A.\} and D. Wilkins and T. Williams and T. Wilson and Wilson, \{H. R.\} and H. Wong and M. Wood and V. Zamkovska",

note = "Publisher Copyright: {\textcopyright} 2024 Crown copyright, UK Atomic Energy Authority \& The Author(s).",

year = "2024",

month = nov,

day = "1",

doi = "10.1088/1741-4326/ad6011",

language = "English",

volume = "64",

journal = "Nuclear Fusion",

issn = "0029-5515",

number = "11",

}

Harrison, JR, Aboutaleb, A, Ahmed, S, Aljunid, M, Allan, SY, Anand, H, Andrew, Y, Appel, LC, Ash, A, Ashton, J, Bachmann, O, Barnes, M, Barrett, B, Baver, D, Beckett, D, Bennett, J, Berkery, J, Bernert, M, Boeglin, W, Bowman, C, Bradley, J, Brida, D, Browning, PK, Brunetti, D, Bryant, P, Bryant, J, Buchanan, J, Bulmer, N, Carruthers, A, Cecconello, M, Chen, ZP, Clark, J, Cowley, C, Coy, M, Crocker, N, Cunningham, G, Cziegler, I, Da Assuncao, T, Damizia, Y, Davies, P, Day, IE, Derks, GL, Dixon, S, Doyle, R, Dreval, M, Dunne, M, Duval, BP, Eagles, T, Edmond, J, El-Haroun, H, Elmore, SD, Enters, Y, Faitsch, M, Federici, F, Fedorczak, N, Felici, F, Field, AR, Fitzgerald, M, Fitzgerald, I, Fitzpatrick, R, Frassinetti, L, Fuller, W, Gahle, D, Galdon-Quiroga, J, Garzotti, L, Gee, S, Gheorghiu, T, Gibson, S, Gibson, KJ, Giroud, C, Greenhouse, D, Hall-Chen, VH, Ham, CJ, Harrison, R, Henderson, SS, Hickling, C, Hnat, B, Howlett, L, Hughes, J, Hussain, R, Imada, K, Jacquet, P, Jepson, P, Kandan, B, Katramados, I, Kazakov, YO, King, D, King, R, Kirk, A, Knolker, M, Kochan, M, Kogan, L, Kool, B, Kotschenreuther, M, Lees, M, Leonard, AW, Liddiard, G, Lipschultz, B, Liu, YQ, Lomanowski, BA, Lonigro, N, Lore, J, Lovell, J, Mahajan, S, Maiden, F, Man-Friel, C, Mansfield, F, Marsden, S, Martin, R, Mazzi, S, McAdams, R, McArdle, G, McClements, KG, McClenaghan, J, McConville, D, McKay, K, McKnight, C, McKnight, P, McLean, A, McMillan, BF, McShee, A, Measures, J, Mehay, N, Michael, CA, Militello, F, Morbey, D, Mordijck, S, Moulton, D, Myatra, O, Nelson, AO, Nicassio, M, O'Mullane, MG, Oliver, HJC, Ollus, P, Osborne, T, Osborne, N, Parr, E, Parry, B, Patel, BS, Payne, D, Paz-Soldan, C, Phelps, A, Piron, L, Piron, C, Prechel, G, Price, M, Pritchard, B, Proudfoot, R, Reimerdes, H, Rhodes, T, Richardson, P, Riquezes, J, Rivero-Rodriguez, JF, Roach, CM, Robson, M, Ronald, K, Rose, E, Ryan, P, Ryan, D, Saarelma, S, Sabbagh, S, Sarwar, R, Saunders, P, Sauter, O, Scannell, R, Schuett, T, Seath, R, Sharma, R, Shi, P, Sieglin, B, Simmonds, M, Smith, J, Smith, A, Soukhanovskii, VA, Speirs, D, Staebler, G, Stephen, R, Stevenson, P, Stobbs, J, Stott, M, Stroud, C, Tame, C, Theiler, C, Thomas-Davies, N, Thornton, AJ, Tobin, M, Vallar, M, Vann, RGL, Velarde, L, Verhaegh, K, Viezzer, E, Vincent, C, Voss, G, Warr, M, Wehner, W, Wiesen, S, Wijkamp, TA, Wilkins, D, Williams, T, Wilson, T, Wilson, HR, Wong, H, Wood, M & Zamkovska, V 2024, 'Overview of physics results from MAST upgrade towards core-pedestal-exhaust integration', Nuclear Fusion, vol. 64, nr. 11, 112017. https://doi.org/10.1088/1741-4326/ad6011

TY - JOUR

T1 - Overview of physics results from MAST upgrade towards core-pedestal-exhaust integration

AU - Harrison, J. R.

AU - Aboutaleb, A.

AU - Ahmed, S.

AU - Aljunid, M.

AU - Allan, S. Y.

AU - Anand, H.

AU - Andrew, Y.

AU - Appel, L. C.

AU - Ash, A.

AU - Ashton, J.

AU - Bachmann, O.

AU - Barnes, M.

AU - Barrett, B.

AU - Baver, D.

AU - Beckett, D.

AU - Bennett, J.

AU - Berkery, J.

AU - Bernert, M.

AU - Boeglin, W.

AU - Bowman, C.

AU - Bradley, J.

AU - Brida, D.

AU - Browning, P. K.

AU - Brunetti, D.

AU - Bryant, P.

AU - Bryant, J.

AU - Buchanan, J.

AU - Bulmer, N.

AU - Carruthers, A.

AU - Cecconello, M.

AU - Chen, Z. P.

AU - Clark, J.

AU - Cowley, C.

AU - Coy, M.

AU - Crocker, N.

AU - Cunningham, G.

AU - Cziegler, I.

AU - Da Assuncao, T.

AU - Damizia, Y.

AU - Davies, P.

AU - Day, I. E.

AU - Derks, G. L.

AU - Dixon, S.

AU - Doyle, R.

AU - Dreval, M.

AU - Dunne, M.

AU - Duval, B. P.

AU - Eagles, T.

AU - Edmond, J.

AU - El-Haroun, H.

AU - Elmore, S. D.

AU - Enters, Y.

AU - Faitsch, M.

AU - Federici, F.

AU - Fedorczak, N.

AU - Felici, F.

AU - Field, A. R.

AU - Fitzgerald, M.

AU - Fitzgerald, I.

AU - Fitzpatrick, R.

AU - Frassinetti, L.

AU - Fuller, W.

AU - Gahle, D.

AU - Galdon-Quiroga, J.

AU - Garzotti, L.

AU - Gee, S.

AU - Gheorghiu, T.

AU - Gibson, S.

AU - Gibson, K. J.

AU - Giroud, C.

AU - Greenhouse, D.

AU - Hall-Chen, V. H.

AU - Ham, C. J.

AU - Harrison, R.

AU - Henderson, S. S.

AU - Hickling, C.

AU - Hnat, B.

AU - Howlett, L.

AU - Hughes, J.

AU - Hussain, R.

AU - Imada, K.

AU - Jacquet, P.

AU - Jepson, P.

AU - Kandan, B.

AU - Katramados, I.

AU - Kazakov, Y. O.

AU - King, D.

AU - King, R.

AU - Kirk, A.

AU - Knolker, M.

AU - Kochan, M.

AU - Kogan, L.

AU - Kool, B.

AU - Kotschenreuther, M.

AU - Lees, M.

AU - Leonard, A. W.

AU - Liddiard, G.

AU - Lipschultz, B.

AU - Liu, Y. Q.

AU - Lomanowski, B. A.

AU - Lonigro, N.

AU - Lore, J.

AU - Lovell, J.

AU - Mahajan, S.

AU - Maiden, F.

AU - Man-Friel, C.

AU - Mansfield, F.

AU - Marsden, S.

AU - Martin, R.

AU - Mazzi, S.

AU - McAdams, R.

AU - McArdle, G.

AU - McClements, K. G.

AU - McClenaghan, J.

AU - McConville, D.

AU - McKay, K.

AU - McKnight, C.

AU - McKnight, P.

AU - McLean, A.

AU - McMillan, B. F.

AU - McShee, A.

AU - Measures, J.

AU - Mehay, N.

AU - Michael, C. A.

AU - Militello, F.

AU - Morbey, D.

AU - Mordijck, S.

AU - Moulton, D.

AU - Myatra, O.

AU - Nelson, A. O.

AU - Nicassio, M.

AU - O'Mullane, M. G.

AU - Oliver, H. J.C.

AU - Ollus, P.

AU - Osborne, T.

AU - Osborne, N.

AU - Parr, E.

AU - Parry, B.

AU - Patel, B. S.

AU - Payne, D.

AU - Paz-Soldan, C.

AU - Phelps, A.

AU - Piron, L.

AU - Piron, C.

AU - Prechel, G.

AU - Price, M.

AU - Pritchard, B.

AU - Proudfoot, R.

AU - Reimerdes, H.

AU - Rhodes, T.

AU - Richardson, P.

AU - Riquezes, J.

AU - Rivero-Rodriguez, J. F.

AU - Roach, C. M.

AU - Robson, M.

AU - Ronald, K.

AU - Rose, E.

AU - Ryan, P.

AU - Ryan, D.

AU - Saarelma, S.

AU - Sabbagh, S.

AU - Sarwar, R.

AU - Saunders, P.

AU - Sauter, O.

AU - Scannell, R.

AU - Schuett, T.

AU - Seath, R.

AU - Sharma, R.

AU - Shi, P.

AU - Sieglin, B.

AU - Simmonds, M.

AU - Smith, J.

AU - Smith, A.

AU - Soukhanovskii, V. A.

AU - Speirs, D.

AU - Staebler, G.

AU - Stephen, R.

AU - Stevenson, P.

AU - Stobbs, J.

AU - Stott, M.

AU - Stroud, C.

AU - Tame, C.

AU - Theiler, C.

AU - Thomas-Davies, N.

AU - Thornton, A. J.

AU - Tobin, M.

AU - Vallar, M.

AU - Vann, R. G.L.

AU - Velarde, L.

AU - Verhaegh, K.

AU - Viezzer, E.

AU - Vincent, C.

AU - Voss, G.

AU - Warr, M.

AU - Wehner, W.

AU - Wiesen, S.

AU - Wijkamp, T. A.

AU - Wilkins, D.

AU - Williams, T.

AU - Wilson, T.

AU - Wilson, H. R.

AU - Wong, H.

AU - Wood, M.

AU - Zamkovska, V.

PY - 2024/11/1

Y1 - 2024/11/1

N2 - Recent results from MAST Upgrade are presented, emphasising understanding the capabilities of this new device and deepening understanding of key physics issues for the operation of ITER and the design of future fusion power plants. The impact of MHD instabilities on fast ion confinement have been studied, including the first observation of fast ion losses correlated with Compressional and Global Alfvén Eigenmodes. High-performance plasma scenarios have been developed by tailoring the early plasma current ramp phase to avoid internal reconnection events, resulting in a more monotonic q profile with low central shear. The impact of m/n = 3/2, 2/1 and 1/1 modes on thermal plasma confinement and rotation profiles has been quantified, and scenarios optimised to avoid them have transiently reached values of normalised beta approaching 4.2. In pedestal and ELM physics, a maximum pedestal top temperature of ∼350 eV has been achieved, exceeding the value achieved on MAST at similar heating power. Mitigation of type-I ELMs with n = 1 RMPs has been observed. Studies of plasma exhaust have concentrated on comparing conventional and Super-X divertor configurations, while X-point target, X-divertor and snowflake configurations have been developed and studied in parallel. In L-mode discharges, the separatrix density required to detach the outer divertors is approximately a factor 2 lower in the Super-X than the conventional configuration, in agreement with simulations. Detailed analysis of spectroscopy data from studies of the Super-X configuration reveal the importance of including plasma-molecule interactions and D2 Fulcher band emission to properly quantify the rates of ionisation, plasma-molecule interactions and volumetric recombination processes governing divertor detachment. In H-mode with conventional and Super-X configurations, the outer divertors are attached in the former and detached in the latter with no impact on core or pedestal confinement.

AB - Recent results from MAST Upgrade are presented, emphasising understanding the capabilities of this new device and deepening understanding of key physics issues for the operation of ITER and the design of future fusion power plants. The impact of MHD instabilities on fast ion confinement have been studied, including the first observation of fast ion losses correlated with Compressional and Global Alfvén Eigenmodes. High-performance plasma scenarios have been developed by tailoring the early plasma current ramp phase to avoid internal reconnection events, resulting in a more monotonic q profile with low central shear. The impact of m/n = 3/2, 2/1 and 1/1 modes on thermal plasma confinement and rotation profiles has been quantified, and scenarios optimised to avoid them have transiently reached values of normalised beta approaching 4.2. In pedestal and ELM physics, a maximum pedestal top temperature of ∼350 eV has been achieved, exceeding the value achieved on MAST at similar heating power. Mitigation of type-I ELMs with n = 1 RMPs has been observed. Studies of plasma exhaust have concentrated on comparing conventional and Super-X divertor configurations, while X-point target, X-divertor and snowflake configurations have been developed and studied in parallel. In L-mode discharges, the separatrix density required to detach the outer divertors is approximately a factor 2 lower in the Super-X than the conventional configuration, in agreement with simulations. Detailed analysis of spectroscopy data from studies of the Super-X configuration reveal the importance of including plasma-molecule interactions and D2 Fulcher band emission to properly quantify the rates of ionisation, plasma-molecule interactions and volumetric recombination processes governing divertor detachment. In H-mode with conventional and Super-X configurations, the outer divertors are attached in the former and detached in the latter with no impact on core or pedestal confinement.

KW - MAST upgrade

KW - alternative divertors

KW - exhaust

KW - fast ions

KW - integrated scenarios

KW - pedestal

UR - https://www.scopus.com/pages/publications/85203195588

U2 - 10.1088/1741-4326/ad6011

DO - 10.1088/1741-4326/ad6011

M3 - Article

AN - SCOPUS:85203195588

SN - 0029-5515

VL - 64

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 11

M1 - 112017

ER -

Overview of physics results from MAST upgrade towards core-pedestal-exhaust integration

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