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Understanding the many aspects of tokamak physics requires the development of quite sophisticated models. Moreover, in the operation of the devices, prediction of the future evolution of discharges can be of crucial importance, particularly in the case of the prediction of disruptions, which can cause serious damage to various parts of the machine. The determination of the limits of predictability is therefore an important issue for modelling, classifying and forecasting. In all these cases, once a certain level of performance has been reached, the question typically arises as to whether all the information available in the data has been exploited, or whether there are still margins for improvement of the tools being developed. In this paper, a theoretical information approach is proposed to address this issue. The excellent properties of the developed indicator, called the prediction factor (PF), have been proved with the help of a series of numerical tests. Its application to some typical behaviour relating to macroscopic instabilities in tokamaks has shown very positive results. The prediction factor has also been used to assess the performance of disruption predictors running in real time in the JET system, including the one systematically deployed in the feedback loop for mitigation purposes. The main conclusion is that the most advanced predictors basically exploit all the information contained in the locked mode signal on which they are based. Therefore, qualitative improvements in disruption prediction performance in JET would need the processing of additional signals, probably profiles.
Determining the prediction limits of models and classifiers with applications for disruption prediction in JET
Murari, A.;Peluso, E.;Vega, J.;Gelfusa, M.;Lungaroni, M.;Gaudio, P.;Martínez, F. J.;Abhangi, M.;Abreu, P.;Aftanas, M.;Afzal, M.;Aggarwal, K. M.;Aho Mantila, L.;Ahonen, E.;Aints, M.;Airila, M.;Albanese, R.;Alegre, D.;Alessi, E.;Aleynikov, P.;Alfier, A.;Alkseev, A.;Allan, P.;Almaviva, S.;Alonso, A.;Alper, B.;Alsworth, I.;Alves, D.;Ambrosino, G.;Ambrosino, R.;Amosov, V.;Andersson, F.;Andersson Sunde´n, E.;Angelone, M.;Anghel, A.;Anghel, M.;Angioni, C.;Appel, L.;Apruzzese, G.;Arena, P.;Ariola, M.;Arnichand, H.;Arnoux, G.;Arshad, S.;Ash, A.;Asp, E.;Asunta, O.;Cooper, D.;Cooper, S. R.;Corre, Y.;Corrigan, G.;Cortes, S.;Coster, D.;Couchman, A. S.;Cox, M.;Cox, M. P.;Cox, P.;Craciunescu, T.;Cramp, S.;Crisanti, F.;Cristescu, I.;Croci, G.;Croft, O.;Crombe, K.;Crowe, R.;Cruz, N.;Cseh, G.;Cull, K.;Cupido, L.;Curran, D.;Curuia, M.;Czarnecka, A.;Czarski, T.;Dalley, S.;Dalziel, A.;Darrow, D.;Davies, R.;Davis, W.;Day, C.;Day, I. E.;de la Cal, E.;de la Luna, E.;De Magistris, M.;de Pablos, J. L.;De Tommasi, G.;de Vries, P. C.;Deakin, K.;Deane, J.;Decker, J.;Degli Agostini, F.;Dejarnac, R.;Delabie, E.;den Harder, N.;Dendy, R. O.;Denner, P.;Devaux, S.;Devynck, P.;Di Maio, F.;Di Pace, L.;Dittmar, T.;Dodt, D.;Donne, T.;Dooley, P.;Dorling, S. E.;Dormido Canto, S.;Doswon, S.;Douai, D.;Doyle, P. T.;Dreischuh, T.;Drewelow, P.;Drozdov, V.;Drozdowicz, K.;Dumont, R.;Dumortier, P.;Atanasiu, C. V.;Austin, Y.;Avotina, L.;Axton, M. D.;Dunai, D.;Dunne, M.;Dˇuran, I.;Durodie, F.;Ayres, C.;Bachmann, C.;Baciero, A.;Baia˜o, D.;Bailescu, V.;Baiocchi, B.;Baker, A.;Baker, R. A.;Balboa, I.;Balden, M.;Balshaw, N.;Bament, R.;Banks, J. W.;Baranov, Y. F.;Barlow, I. L.;Barnard, M. A.;Barnes, D.;Barnsley, R.;Baron Wiechec, A.;Baruzzo, M.;Basiuk, V.;Bassan, M.;Bastow, R.;Batista, A.;Batistoni, P.;Bauer, R.;Bauvir, B.;Bazylev, B.;Beal, J.;Beaumont, P. S.;Becoulet, A.;Bednarczyk, P.;Bekris, N.;Beldishevski, M.;Bell, K.;Belli, F.;Dutta, P.;Duval, B.;Dux, R.;Dylst, K.;Dzysiuk, N.;Edappala, P. V.;Edwards, A. M.;Eich, T.h.;Ekedahl, A.;Elevant, T.;El Jorf, R.;Elsmore, C. G.;Ericsson, G.;Eriksson, A.;Eriksson, J.;Eriksson, L. G.;Esposito, B.;Esser, H. G.;Esteve, D.;Evans, G. E.;Evans, J.;Ewart, G. D.;Ewers, D. T.;Fagan, D.;Falie, D.;Farthing, J. W.;Fasoli, A.;Fattorini, L.;Faugeras, B.;Faustin, J.;Fawlk, N.;Federici, G.;Fedorczak, N.;Felton, R. C.;Fenzi, C.;Fernades, A.;Fernandes, H.;Ferreira, J.;Bellinger, M.;Belo, J. K.;Belo, P.;Belonohy, E.´.;Fessey, J. A.;Figini, L.;Figueiredo, A.;Figueiredo, J.;Benterman, N. A.;Bergsåker, H.;Bernardo, J.;Bernert, M.;Berry, M.;Bertalot, L.;Beurskens, M. N. A.;Bieg, B.;Bielecki, J.;Biewer, T.;Bigi, M.;B´ılkova, P.;Binda, F.;Bizarro, J. P. S.;Bjo¨ rkas, C.;Blackman, K.;Blackman, T. R.;Blanchard, P.;Blanco, E.;Blatchford, P.;Bobkov, V.;Boboc, A.;Bodna´r, G.;Bogar, O.;Bolzonella, T.;Boncagni, L.;Bonham, R.;Bonheure, G.;Boom, J.;Booth, J.;Borba, D.;Borodin, D.;Botrugno, A.;Boulbe, C.;Boulting, P.;Bovert, K. V.;Bowden, M.;Bower, C.;Boyce, T.;Boyer, H. J.;Bradshaw, J. M. A.;Braic, V.;Breizman, B.;Bremond, S.;Brennan, P. D.;Brett, A.;Brezinsek, S.;Bright, M. D. J.;Brix, M.;Broeckx, W.;Brombin, M.;Brown, B. C.;Brown, D. P. D.;Brown, M.;Bruno, E.;Bucalossi, J.;Buch, J.;Buckley, M. A.;Bucko, K.;Budny, R.;Bufferand, H.;Bulman, M.;Bulmer, N.;Bunting, P.;Buratti, P.;Burcea, G.;Burckhart, A.;Buscarino, A.;Butcher, P. R.;Butler, N. K.;Bykov, I.;Byrne, J.;Byszuk, A.;Cackett, A.;Cahyna, P.;Cain, G.;Calabro, G.;Callaghan, C. P.;Campling, D. C.;Cane, J.;Cannas, B.;Capel, A. J.;Caputano, M.;Card, P. J.;Cardinali, A.;Carman, P.;Carralero, D.;Carraro, L.;Carvalho, B. B.;Carvalho, I.;Carvalho, P.;Casson, F. J.;Castaldo, C.;Cavazzana, R.;Cavinato, M.;Cazzaniga, A.;Cecconello, M.;Cecil, E.;Cenedese, A.;Centioli, C.;Cesario, R.;Challis, C. D.;Chandler, M.;Chandra, D.;Chang, C. S.;Chankin, A.;Chapman, I. T.;Chapman, S. C.;Chernyshova, M.;Chiru, P.;Chitarin, G.;Chouli, B.;Chung, N.;Ciraolo, G.;Ciric, D.;Citrin, J.;Clairet, F.;Clark, E.;Clatworthy, D.;Clay, R.;Clever, M.;Coad, J. P.;Coates, P. A.;Coccorese, V.;Cocilovo, V.;Coda, S.;Coelho, R.;Coenen, J. W.;Coffey, I.;Colas, L.;Collins, S.;Conboy, J. E.;Conroy, S.;Cook, N.;Coombs, D.;Fil, A.;Finburg, P.;Firdaouss, M.;Fischer, U.;Fittill, L.;Fitzgerald, M.;Flammini, D.;Flanagan, J.;Fleming, C.;Flinders, K.;Formisano, A.;Forsythe, L.;Fortuna, L.;Fortune, M.;Frasca, M.;Frassinetti, L.;Freisinger, M.;FRESA, RAFFAELE;Frigione, D.;Fuchs, V.;Fyvie, J.;Gadomska, M.;Ga´l, K.;Galperti, C.;Galva˜o, R.;Gao, X.;Garavaglia, S.;Garcia, J.;Garcia Carrasco, A.;Garc´ıa Munoz, M.;Gardner, M.;Garzotti, L.;Gaudio, P.;Gauthier, E.;Gaze, J. W.;Gear, D. F.;Gee, S. J.;Gelfusa, M.;Genangeli, E.;Gerasimov, S.;Gervasini, G.;Ghate, M.;Gherendi, M.;Giacalone, J. C.;Giacomelli, L.;Gibson, C. S.;Giegerich, T.;Gin, D.;Giovannozzi, E.;Girardo, J. B.;Giroud, C.;Giruzzi, G.;Gleason Gonzalez, C.;Godwin, J.;Gohil, P.;Go´ jska, A.;Goloborod’Ko, V.;Gomes, R.;Gonc¸alves, B.;Goniche, M.;Gonzalez, S.;Goodsell, B.;Goodyear, A.;Gorini, G.;Goussarov, A.;Graham, B.;Graham, M. E.;Graves, J.;Grazier, N.;Green, N. R.;Greuner, H.;Grigore, E.;Griph, F. S.;Grisolia, C.;Grist, D.;Groth, M.;Grundy, C. N.;Gryaznevich, M.;Guard, D.;Gubb, D.;Guillemaut, C.;Guo, Y.;Utoh, H. H.;Hackett, L. J.;Hacquin, S.;Hagar, A.;Hakola, A.;Halitovs, M.;Hall, S. J.;Hallworth Cook, S. P.;Hammond, K.;Hart, J.;Harting, D.;Hartmann, N.;Haupt, T. D. V.;Hawkes, N. C.;Hawkins, J.;Haydon, P. W.;Hazel, S.;Heesterman, P. J. L.;Heinola, K.;Hellesen, C.;Hellsten, T.;Helou, W.;Hemming, O. N.;Hender, T. C.;Henderson, M.;Henriques, R.;Hepple, D.;Hermon, G.;Hidalgo, C.;Highcock, E. G.;Hill, J. W.;Hill, M.;Hillairet, J.;Hillesheim, J.;Hillis, D.;Hjalmarsson, A.;Hobirk, J.;Hogben, C. H. A.;Hogeweij, G. M. D.;Homfray, D. A.;Hora´cˇek, J.;Horton, A. R.;Horton, L. D.;Hotchin, S. P.;Hough, M. R.;Howarth, P. J.;Huber, A.;Huddleston, T. M.;Hughes, M.;Hunter, C. L.;Hurzlmeier, H.;Huygen, S.;Huynh, P.;Igitkhanov, J.;Iglesias, D.;Imr´ısˇek, M.;Ivanova, D.;Ivanova Stanik, I.;Ivings, E.;Jachmich, S.;Jacobsen, A. S.;Jacquet, P.;Jakubowska, K.;James, J.;Janky, F.;Ja¨rvinen, A.;Jaulmes, F.;Jednorog, S.;Jenkins, C.;Jenkins, I.;Jesˇko, K.;Joffrin, E.;Johnson, R.;Johnson, T.;Joita, L.;Jones, G.;Jones, T. T. C.;Joyce, L.;Jupe´n, C.;Hoshino, K. K.;Kallenbach, A.;Kalupin, D.;Kamiya, K.;Kaniewski, J.;Kantor, A.;Karhunen, J.;Kasprowicz, G.;Kaveney, G.;Kazakov, Y.;Keeling, D. L.;Keep, J.;Kempenaars, M.;Kennedy, C.;Kenny, D.;Khilkevich, E.;Kiisk, M.;Kim, H. T.;Kim, H. S.;King, C.;King, D.;King, R. F.;Kinna, D. J.;Kiptily, V.;Kirov, K.;Kirschner, A.;Kizane, G.;Klepper, C.;Knaup, M.;Knipe, S. J.;Kobuchi, T.;Ko¨ chl, F.;Kocsis, G.;Kogut, D.;Koivuranta, S.;Ko¨ ppen, M.;Koskela, T.;Koslowski, H. R.;Kotov, V.;Kowalska Strze˛ciwilk, E.;Krasilnikov, A.;Krasilnikov, V.;Kreter, A.;Krieger, K.;Krivchenkov, Y.;Krivska, A.;Kruezi, U.;Ksiazek, I.;Kukushkin, A.;Kundu, A.;Kurki Suonio, T.;Kwon, O. J.;Kyrytsya, V.;Laan, M.;Labate, C.;Laguardia, L.;Lam, N.;Lane, C.;Lang, P. T.;Lapins, J.;Lasa, A.;Last, J. R.;Lawson, A.;Lawson, K. D.;Lazaros, A.;Lazzaro, E.;Lee, S.;Leggate, H. J.;Lehnen, M.;Leichtle, D.;Leichuer, P.;Leipold, F.;Lengar, I.;Lennholm, M.;Lerche, E.;Leyland, M.;Leysen, W.;Liang, Y.;Likonen, J.;Lindholm, V.;Linke, J.;Linsmeier, C.h.;Lipschultz, B.;Litaudon, X.;Liu, G.;Liu, Y.;Lo Schiavo, V. P.;Loarer, T.;Loarte, A.;Lobel, R. C.;Lohr, N.;Lomas, P. J.;Lo¨ nnroth, J.;Lo´ pez, J.;Lo´ pez, J. M.;Louche, F.;Loving, A. B.;Lowbridge, S.;Lowry, C.;Luce, T.;Lucock, R. M. A.;Lukin, A.;Lungu, A. M.;Lungu, C. P.;Lupelli, I.;Lyssoivan, A.;Macheta, P.;Mackenzie, A. S.;Maddaluno, G.;Maddison, G. P.;Magesh, B.;Maget, P.;Maggi, C. F.;Maier, H.;Mailloux, J.;Maj, A.;Makkonen, T.;Makwana, R.;Malaquias, A.;Mansffield, F.;Mansfield, M.;Manso, M. E.;Mantica, P.;Mantsinen, M.;Manzanares, A.;Marandet, Y.;Marcenko, N.;Marchetto, C.;Marchuk, O.;Marinelli, M.;Marinucci, M.;Markovicˇ, T.;Marocco, D.;Marot, L.;Marren, C. A.;Marsen, S.;Marshal, R.;Martin, A.;Martin, D. L.;Martin, Y.;Mart´ın de Aguilera, A.;Mart´ın Sol´ıs, J. R.;Masiello, A.;Maslov, M.;Maslova, V.;Matejcik, S.;Mattei, M.;Matthews, G. F.;Matveev, D.;Matveev, M.;Maviglia, F.;Mayer, M.;Mayoral, M. L.;Mazon, D.;Mazzotta, C.;Mcadams, R.;Mccarthy, P. J.;Mcclements, K. G.;Mccormick, K.;Mccullen, P. A.;Mcdonald, D.;Mcgregor, R.;Mckean, R.;Mckehon, J.;Mckinley, R.;Meadows, I.;Meadows, R. C.;Medina, F.;Medland, M.;Medley, S.;Meigh, S.;Meigs, A. G.;Meneses, L.;Menmuir, S.;Merrigan, I. R.;Mertens, P.h.;Meshchaninov, S.;Messiaen, A.;Meszaros, B.;Meyer, H.;Miano, G.;Michling, R.;Middleton Gear, D.;Miettunen, J.;Migliucci, P.;Militello Asp, E.;Minucci, S.;Mirizzi, F.;Miyoshi, Y.;Mlyna´ˇr, J.;Monakhov, I.;Monier Garbet, P.;Mooney, R.;Moradi, S.;Mordijck, S.;Moreira, L.;Moreno, R.;Morgan, P. D.;Morgan, R.;Morley, L.;Morlock, C.;Morris, A. W.;Morris, J.;Moser, L.;Moulton, D.;Murari, A.;Muraro, A.;Mustata, I.;Asakura, N. N.;Nabais, F.;Nakano, T.;Nardon, E.;Naulin, V.;Nave, M. F. F.;Nedzelski, I.;Neethiraj, N.;Nemtsev, G.;Nespoli, F.;Neto, A.;Neu, R.;Neubauer, O.;Newman, M.;Nicholls, K. J.;Nicolai, D.;Nicolas, T.;Nieckchen, P.;Nielsen, P.;Nightingale, M. P. S.;Nilsson, E.;Nishijima, D.;Noble, C.;Nocente, M.;Nodwell, D.;Nordman, H.;Nunes, I.;O’Meara, B.;Oberkofler, M.;Obryk, B.;Odupitan, T.;Ogawa, M. T.;O’Gorman, T.;Okabayashi, M.;Olariu, S.;O’Mullane, M.;Ongena, J.;Orsitto, F.;Oswuigwe, B. I.;Pace, N.;Pacella, D.;Page, A.;Paget, A.;Pagett, D.;Pajuste, E.;Palazzo, S.;Pamela, J.;Pamela, S.;Panin, A.;Panja, S.;Papp, P.;Parail, V.;Paris, P.;Parish, S. C. W.;Park, M.;Parsloe, A.;Pasqualotto, R.;Pearson, I. J.;Pedrosa, M. A.;Pereira, R.;Perelli Cippo, E.;Thun, C.h. Perez von;Perez Von Thun, C.;Pericoli Ridolfini, V.;Perona, A.;Peruzzo, S.;Peschanyi, S.;Peterka, M.;Petersson, P.;Petravich, G.;Petrzˇilka, V.;Pfefferle, D.;Philipps, V.;Pietropaolo, A.;Pillon, M.;Pintsuk, G.;Piovesan, P.;Pires dos Reis, A.;Pironti, A.;Pisano, F.;Pitts, R.;Plusczyk, C.;Plyusnin, V.;Pomaro, N.;Pompilian, O.;Pool, P. J.;Popovichev, S.;Porcelli, F.;Porosnicu, C.;Porton, M.;Pospieszczyk, A.;Possnert, G.;Potzel, S.;Powell, T.;Pozniak, K.;Pozzi, J.;Prajapati, V.;Prakash, R.;Prestopino, G.;Price, D.;Price, R.;Prior, P.;Prokopowicz, R.;Proudfoot, R.;Puglia, P.;Puiatti, M. E.;Pulley, D.;Purahoo, K.;Tterich, T.h. Pu¨;Quercia, A.;Rachlew, E.;Rack, M.;Raeder, J.;Rainford, M. S. J.;Ramogida, G.;Ranjan, S.;Rasmussen, J.;Rasmussen, J. J.;Rathod, K.;Ratta, G.;Rayner, C.;Rebai, M.;Reece, D.;Reed, A.;Re´fy, D.;Regan, B.;Regana, J.;Reich, M.;Reid, P.;Reinelt, M.;Reinke, M. L.;Reinke, M.;Reiser, D.;Reiter, D.;Rendell, D.;Reux, C.;Riccardo, V.;Rimini, F. G.;Riva, M.;Roberts, J. E. C.;Robins, R. J.;Robinson, S. A.;Robinson, T.;Robson, D. W.;Roddick, P.;Rodionov, R.;Rohde, V.;Romanelli, F.;Romanelli, M.;Romanelli, S.;Romano, A.;Rowe, D.;Rowe, S.;Rowley, A.;Rubel, M.;Rubinacci, G.;Ruchko, L.;Ruiz, M.;Ruset, C.;Ryc, L.;Rzadkiewicz, J.;Saarelma, S.;Sabot, R.;Sadakov, S.;Safi, E.;Sagar, P.;Saibene, G.;Saint Laurent, F.;Salewski, M.;Salmi, A.;Salzedas, F.;Samm, U.;Sandiford, D.;Sandquist, P.;Santa, P.;Santala, M. I. K.;Sartori, F.;Sartori, R.;Saunders, R.;Sauter, O.;Scannell, R.;Scarabosio, A.;Schlummer, T.;Schmidt, V.;Schmitz, O.;Schmuck, S.;Schneider, M.;Scholz, M.;Scho¨ pf, K.;Schweer, B.;Sergienko, G.;Serikov, A.;Sertoli, M.;Shabbir, A.;Shannon, M.;Shannon, M. M. J.;Sharapov, S. E.;Shaw, I.;Shaw, S. R.;Shepherd, A.;Shevelev, A.;Shumack, A.;Sibbald, M.;Sieglin, B.;Silva, C.;Simmons, P. A.;Sinha, A.;Sipila, S. K.;Sips, A. C. C.;Sire´n, P.;Sirinelli, A.;Sjo¨ strand, H.;Skiba, M.;Skilton, R.;Slade, B.;Smith, N.;Smith, P. G.;Smith, T. J.;Snoj, L.;Soare, S.;Solano, E. R.;Soldatov, S.;Sonato, P.;Sopplesa, A.;Sousa, J.;Sowden, C. B. C.;Sozzi, C.;Sparkes, A.;Spelzini, T.;Spineanu, F.;Stables, G.;Stamatelatos, I.;Stamp, M. F.;Stancalie, V.;Stankiewicz, R.;Stanku¯ nas, G.;Stano, M.;Stan Sion, C.;Starkey, D. E.;Stead, M. J.;Stejner, M.;Stephen, A. V.;Stephen, M.;Stevens, B. D.;Stoyanov, D.;Strachan, J.;Strand, P.;Stransky, M.;Stro¨ m, P.;Stubbs, G.;Studholme, W.;Subba, F.;Summers, H. P.;Sun, Y.;Svensson, J.;Sykes, N.;Syme, B. D.;Szabolics, T.;Szepesi, G.;Szydlowski, A.;Suzuki, T. T.;Tabare´s, F.;Takalo, V.;Ta´l, B.;Tala, T.;Talbot, A. R.;Taliercio, C.;Tamain, P.;Tame, C.;Tardocchi, M.;Taroni, L.;Taylor, K. A.;Telesca, G.;Teplova, N.;Terra, A.;Testa, D.;Teuchner, B.;Tholerus, S.;Thomas, F.;Thomas, J. D.;Thomas, P.;Thompson, A.;Thompson, C. A.;Thompson, V. K.;Thomson, L.;Thorne, L.;Tigwell, P. A.;Tipton, N.;Tiseanu, I.;Tojo, H.;Tokar, M. Z.;Tomesˇ, M.;Tonner, P.;Tosti, S.;Towndrow, M.;Trimble, P.;Tripsky, M.;Tsalas, M.;Tsitrone, E.;Tskhakaya jun, D.;Tudisco, O.;Turner, I.;Turner, M. M.;Turnyanskiy, M.;Tvalashvili, G.;Tyrrell, S. G. J.;Ul Abidin, Z.;Ulyatt, D.;Unterberg, B.;Urano, H.;Uytdenhouwen, I.;Vadgama, A. P.;Valcarcel, D.;Valisa, M.;Valovic, M.;Van Eester, D.;Van Renterghem, W.;van Rooij, G. J.;Varandas, C. A. F.;Varoutis, S.;Vartanian, S.;Vasava, K.;Vdovin, V.;Vega, J.;Verdoolaege, G.;Verhoeven, R.;Verona, C.;Vervier, M.;Veshchev, E.;Ve´zinet, D.;Vicente, J.;Villari, S.;Villone, F.;Vinyar, I.;Viola, B.;Vitelli, R.;Vitins, A.;Vlad, M.;Voitsekhovitch, I.;Vondra´cˇek, P.;Vrancken, M.;Pires de Sa, W. W.;Waldon, C. W. F.;Walker, M.;Walsh, M.;Warren, R. J.;Waterhouse, J.;Watkins, N. W.;Watts, C.;Wauters, T.;Way, M. W.;Webster, A.;Weckmann, A.;Weiland, J.;Weisen, H.;Weiszflog, M.;Welte, S.;Wendel, J.;Wenninger, R.;West, A. T.;Wheatley, M. R.;Whetham, S.;Whitehead, A. M.;Whitehead, B. D.;Whittington, P.;Widdowson, A. M.;Wiesen, S.;Wilkes, D.;Wilkinson, J.;Williams, M.;Wilson, A. R.;Wilson, D. J.;Wilson, H. R.;Wischmeier, M.;Withenshaw, G.;Witts, D. M.;Wojciech, D.;Wojen´ ski, A.;Wood, D.;Wood, S.;Woodley, C.;Woz´nicka, U.;Wright, J.;Wu, J.;Yao, L.;Yapp, D.;Yavorskij, V.;Yoo, M. G.;Yorkshades, J.;Young, C.;Young, D.;Young, I. D.;Zabolotny, W.;Zacks, J.;Zagorski, R.;Zaitsev, F. S.;Zanino, R.;Zaroschi, V.;Zastrow, K. D.;Zeidner, W.;Zio´ łkowski, A.;Zoita, V.;Zoletnik;I. Zychor, S. Zoletnik;I. Zychor
2017-01-01
Abstract
Understanding the many aspects of tokamak physics requires the development of quite sophisticated models. Moreover, in the operation of the devices, prediction of the future evolution of discharges can be of crucial importance, particularly in the case of the prediction of disruptions, which can cause serious damage to various parts of the machine. The determination of the limits of predictability is therefore an important issue for modelling, classifying and forecasting. In all these cases, once a certain level of performance has been reached, the question typically arises as to whether all the information available in the data has been exploited, or whether there are still margins for improvement of the tools being developed. In this paper, a theoretical information approach is proposed to address this issue. The excellent properties of the developed indicator, called the prediction factor (PF), have been proved with the help of a series of numerical tests. Its application to some typical behaviour relating to macroscopic instabilities in tokamaks has shown very positive results. The prediction factor has also been used to assess the performance of disruption predictors running in real time in the JET system, including the one systematically deployed in the feedback loop for mitigation purposes. The main conclusion is that the most advanced predictors basically exploit all the information contained in the locked mode signal on which they are based. Therefore, qualitative improvements in disruption prediction performance in JET would need the processing of additional signals, probably profiles.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11563/127006
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simulazione ASN
Il report seguente simula gli indicatori relativi alla propria produzione scientifica in relazione alle soglie ASN 2023-2025 del proprio SC/SSD. Si ricorda che il superamento dei valori soglia (almeno 2 su 3) è requisito necessario ma non sufficiente al conseguimento dell'abilitazione. La simulazione si basa sui dati IRIS e sugli indicatori bibliometrici alla data indicata e non tiene conto di eventuali periodi di congedo obbligatorio, che in sede di domanda ASN danno diritto a incrementi percentuali dei valori. La simulazione può differire dall'esito di un’eventuale domanda ASN sia per errori di catalogazione e/o dati mancanti in IRIS, sia per la variabilità dei dati bibliometrici nel tempo. Si consideri che Anvur calcola i valori degli indicatori all'ultima data utile per la presentazione delle domande.
La presente simulazione è stata realizzata sulla base delle specifiche raccolte sul tavolo ER del Focus Group IRIS coordinato dall’Università di Modena e Reggio Emilia e delle regole riportate nel DM 589/2018 e allegata Tabella A. Cineca, l’Università di Modena e Reggio Emilia e il Focus Group IRIS non si assumono alcuna responsabilità in merito all’uso che il diretto interessato o terzi faranno della simulazione. Si specifica inoltre che la simulazione contiene calcoli effettuati con dati e algoritmi di pubblico dominio e deve quindi essere considerata come un mero ausilio al calcolo svolgibile manualmente o con strumenti equivalenti.