Publications

2023

The renormalisation group and the renormalisation group equations
- Kopper Christoph
, 2023. We describe the rigorous renormalisation group in the framework of the euclidean path integral, restricting (largely) to scalar fields. We start from a historical and conceptual overview leading from block spin transformations to the continuum description, with hindsight to critical phenomena. On the technical side we introduce some of the basic properties of Gaussian measures and perturbations thereof. The decomposition of the covariance of a Gaussian measure and its derivative with respect to a parameter lead to discrete (finite) or continuous (infinitesimal) renormalisation group transformations. The latter constitute the differential flow equations of renormalisation group. We comment on some generic results obtained with these methods. Finally we derive the Callan-Symanzik equations.
Bare-bones de Sitter vacua
- Bena Iosif
- Dudas Emilian
- Graña Mariana
- Monaco Gabriele Lo
- Toulikas Dimitrios
Physical Review D, American Physical Society, 2023, 108, pp.L021901. We compute the supersymmetry-breaking three-form fluxes generated by the addition of anti-D3 branes at the tip of a Klebanov-Strassler throat. These fluxes give rise to nontrivial terms in the superpotential when the throat is embedded in a flux compactification. We describe these terms both from a ten-dimensional and from a four-dimensional perspective and show that, upon including K\"ahler-moduli stabilization, the resulting potential admits de Sitter minima. Our proposed de Sitter construction does not require additional supersymmetry-breaking (0,3) fluxes, and hence is more minimalist than the KKLT proposal. (10.1103/PhysRevD.108.L021901)
DOI : 10.1103/PhysRevD.108.L021901
A jeff = 1/2 Kitaev material on the triangular lattice: the case of NaRuO2
- Razpopov Aleksandar
- Kaib David
- Backes Steffen
- Balents Leon
- Wilson Stephen
- Ferrari Francesco
- Riedl Kira
- Valentí Roser
Npj Quantum Materials, Nature publishing, 2023, 8 (1), pp.36. Abstract Motivated by recent reports of a quantum-disordered ground state in the triangular lattice compound NaRuO 2 , we derive a j eff = 1/2 magnetic model for this system by means of first-principles calculations. The pseudospin Hamiltonian is dominated by bond-dependent off-diagonal Γ interactions, complemented by a ferromagnetic Heisenberg exchange and a notably antiferromagnetic Kitaev term. In addition to bilinear interactions, we find a sizable four-spin ring exchange contribution with a strongly anisotropic character, which has been so far overlooked when modeling Kitaev materials. The analysis of the magnetic model, based on the minimization of the classical energy and exact diagonalization of the quantum Hamiltonian, points toward the existence of a rather robust easy-plane ferromagnetic order, which cannot be easily destabilized by physically relevant perturbations. (10.1038/s41535-023-00567-6)
DOI : 10.1038/s41535-023-00567-6
Jet substructure in heavy-ion collisions with energy correlators
- Andres C.
- Dominguez F.
- Holguin J.
- Marquet C.
- Moult I.
, 2023. (10.1016/j.nuclphysbps.2023.11.003)
DOI : 10.1016/j.nuclphysbps.2023.11.003
Quand la théorie des perturbations devient non-perturbative : applications aux systèmes fortement corrélés.
- Garioud Renaud
, 2023. Cette thèse concerne le développement et l’utilisation de nouveaux algorithmes pour l’étude théorique de systèmes quantiques fortement corrélés. Il s’agit de systèmes dans lesquels les interactions, par exemple l’interaction de Coulomb répulsive entre les électrons d’un matériau, induisent des phénomènes physiques remarquables (comme la supraconductivité à haute température critique) qui ne peuvent être décrits dans le cadre d’une théorie standard à un corps. Pour comprendre l’origine de ces phénomènes, il est indispensable de traiter l’ensemble des particules et leurs interactions: on parle du problème à N -corps.Le projet de thèse consiste à continuer le développement, l’analyse et l’application des méthodes numériques dites diagrammatiques à ces systèmes. Si des progrès ont été faits, il reste beaucoup de questions fondamentales ouvertes quant à l’utilisation de méthodes perturbatives pour décrire un système qui est,par nature, dans un régime non-perturbatif. Quelles sont les limites de ces approches? Comment se manifestent les effets des corrélations dans la structure des séries perturbatives?Les développements algorithmiques seront utilisés pour l’étude de modèles de systèmes fortement corrélés, comme le modèle de Hubbard, ce qui permettra d’aborder des questions physiques d’intérêt actuel, en particulier en relation avec la physique des corrélations magnétiques et du pseudo-gap dans les cuprates supraconducteurs ou avec l’existence d’une transition de Mott sans phase ordonnée préemptive telle qu’elle est observée dans des expériences récentes sur des composés organiques. (10.70675/a1e95040z3191z414czba3fz57fc56973174)
DOI : 10.70675/a1e95040z3191z414czba3fz57fc56973174
Strongly-interacting bosons in a two-dimensional quasicrystal optical potential
- Sanchez-Palencia Laurent
, 2023.
Instability from non-Local feedback in a laminar V-shaped flame
- Wang Chuhan
- Lesshafft Lutz
- Varillon Grégoire
- Polifke Wolfgang
- Xu Chunxiao
, 2023.
Interacting bosons on crystalline and quasiperiodic ladders in a magnetic field
- Johnstone Dean
- Öhberg Patrik
- Duncan Callum
Physical Review Research, American Physical Society, 2023, 5 (2), pp.023195. (10.1103/PhysRevResearch.5.023195)
DOI : 10.1103/PhysRevResearch.5.023195
The Surface counter-terms of the $\phi_4^4$ theory on the half space $\mathbb{R}^+ \times\mathbb{R}^3$
- Borji Majdouline
- Kopper Christoph
, 2023. In a previous work, we established perturbative renormalizability to all orders of the massive $\phi^4_4$-theory on a half-space also called the semi-infinite massive $\phi^4_4$-theory. Five counter-terms which are functions depending on the position in the space, were needed to make the theory finite. The aim of the present paper is to prove that these counter-terms are position independent (i.e. constants) for a particular choice of renormalization conditions. We investigate this problem by decomposing the correlation functions into a bulk part, which is defined as the $\phi^4_4$ theory on the full space $\mathbb{R}^4$ with an interaction supported on the half-space, plus a remainder which we call "the surface part". We analyse this surface part and establish perturbatively that the $\phi^4_4$ theory in $\mathbb{R}^+\times\mathbb{R}^3$ is made finite by adding the bulk counter-terms and two additional counter-terms to the bare interaction in the case of Robin and Neumann boundary conditions. These surface counter-terms are position independent and are proportional to $\int_S \phi^2$ and $\int_S \phi\partial_n\phi$. For Dirichlet boundary conditions, we prove that no surface counter-terms are needed and the bulk counter-terms are sufficient to renormalize the connected amputated (Dirichlet) Schwinger functions. A key technical novelty as compared to our previous work is a proof that the power counting of the surface part of the correlation functions is better by one power than their bulk counterparts.
Les Houches 2023: Physics at TeV Colliders: Standard Model Working Group Report
- Andersen J
- Assi B
- Asteriadis K
- Azzurri P
- Barone G
- Behring A
- Benecke A
- Bhattacharya S
- Bothmann E
- Caletti S
- Chen X
- Chiesa M
- Cooper-Sarkar A
- Cridge T
- Gomez A. Cueto
- Datta S
- Dhani P.K
- Donegà M
- Engel T
- Ferrario Ravasio S
- Forte S
- Francavilla P
- Garzelli M.V
- Ghira A
- Ghosh A
- Giuli F
- Gouskos L
- Gras P
- Gütschow C
- Haddad Y
- Harland-Lang L
- Hekhorn F
- Helenius I
- Hinzmann A
- Höche S
- Holguin J
- Huss A
- Huston J
- Ježo T
- Jones S
- Kiebacher S
- Knobbe M
- Kogler R
- Köneke K
- Kunz L
- Leblanc M
- Loch P
- Centeno G. Loeschcke
- Löschner M
- Maas A
- Magni G
- Maier A
- Marcoli M
- Marzani S
- Mcfayden J
- Meinzinger P
- Mikuni V
- Moch S
- Nadolsky P
- Napoletano D
- Pellen M
- Plätzer S
- Poncelet R
- Preuss C
- Qu H
- Rabbertz K
- Reichelt D
- Rescia A
- Roloff J
- Röntsch R
- Sanchez Cruz S
- Sarkar T
- Scyboz L
- Sforza F
- Siódmok A
- Stagnitto G
- Tarek A
- Thorne R.S
- Valassi A
- Whitehead J
- Winter J
- Delaunay C
- Herrmann B
- Re E
, 2023. This report presents a short summary of the activities of the "Standard Model" working group for the "Physics at TeV Colliders" workshop (Les Houches, France, 12-30 June, 2023).
Kinematical higher-twist corrections in $\gamma^* \to M1 M2 \gamma$. I. Neutral meson production
- Pire Bernard
- Song Qin-Tao
Physical Review D, American Physical Society, 2023, 107 (11), pp.114014. We carry out the calculation of kinematical higher-twist corrections to the cross section of $\gamma^* \to M \bar{M} \gamma$ up to twist 4, where $M$ is a scalar or pseudoscalar neutral meson. The three independant helicity amplitudes are presented in terms of the twist-2 generalized distribution amplitudes (GDAs), which are important non-perturbative quantities for understanding the 3D structure of hadrons. Since this process can be measured by BESIII in $e^+ e^-$ collisions, we also perform the numerical estimate of the kinematical higher-twist corrections by using the kinematics of BESIII. We adopt the $\pi \pi$ GDA extracted from Belle measurements and the asymptotic $\pi \pi$ GDA to study the size of the kinematical corrections in the case of pion meson pair, and a model $\eta \eta$ GDA is used to see the impact of target mass corrections $\mathcal O(m^2/s)$ for $\gamma^* \to \eta \eta \gamma$. Our results show that the kinematical higher-twist corrections account for $\sim 20\%$ of the cross sections at BESIII on the average, and it is necessary to include them if one tries to extract GDAs from experimental measurements precisely. Furthermore, the energy-momentum tensor (EMT) form factors can be obtained for mesons with the help of their GDAs, from which one can investigate interesting quantities such as the meson mass radius and mass distribution. (10.1103/PhysRevD.107.114014)
DOI : 10.1103/PhysRevD.107.114014
Diagrammatic Monte Carlo: recent developments and applications to the Hubbard model
- Ferrero Michel
, 2023.
Structure of the normal state and origin of the Schottky anomaly in the correlated heavy-fermion superconductor UTe2
- Khmelevskyi S.
- Pourovskii L.
- Tereshina-Chitrova E.
Physical Review B, American Physical Society, 2023, 107 (21), pp.214501. (10.1103/PhysRevB.107.214501)
DOI : 10.1103/PhysRevB.107.214501
Simulation of laser energy deposition with structured light beams in air and machine learning data treatment for LIBS analysis of remote targets
- Zou Long
, 2023. The propagation of ultrashort and ultra-intense laser pulses in the atmosphere is increasingly studied.Precise control of the focusing of the laser field and the distribution of light filaments extending beyond the focus is required for many applications, such as the Mars exploration mission on the analysis of chemical elements using Laser Induced Breakdown Spectroscopy (LIBS), the analysis of the composition of air by Light Detection and Ranging (LIDAR) techniques, the triggering and guiding of electric discharges between clouds, or the generation of white light laser by filamentation. A quantitative control of the light pulse properties is very difficult due to the complex nonlinear interaction between the intense laser pulse and the medium. At present, commonly used methods rely on the parameter control of the initial laser output and the feedback of the field at the target position. The high-dimension of the parameter space and the high sensitivity of the results to the initial conditions make the adjustment of the laser field outside the laboratory difficult and inefficient to meet the requirements of practical applications.In this context, this thesis proposes an answer to some of the challenges of long-range femtosecond laser pulse propagation, based on laser pulse modulation scenarios that guarantee to reach an on-target laser field with the desired properties. These scenarios were obtained by combining reverse engineering methods and numerical simulations. We show that different target fields can be easily and efficiently achieved by modulating the laser output field. Whenever possible, the modulation is obtained by simulating the reverse propagation of the target field towards the laser.This thesis focuses on two different objectives of laser field control: the long-range projection in the air of (1) a filament of predefined length, and (2) high intensity.(1) To achieve the first objective, one of the innovations of this thesis consists in introducing a controllable intermediate Bessel-Gauss beam close to the target, and in using a numerical algorithm to propagate this electric field forward in order to obtain the distribution of the filaments at the target point as well as back-propagate the intermediate field to obtain the desired laser output. The obtained laser output parameters are then related to filament features (starting point, length, density), providing a map for the key parameters defining the modulated laser pulse that can be projected onto the desired target field and filament.(2) For the objective of transmitting high intensities at kilometric distances, we examine the nonlinear propagation of circular Airy beams and show that a laser power of a few tens of GW is sufficient to ionize the air and form a short filament at a distance of 1 km, which could facilitate laser operating conditions compared to TW-class lasers used in conventional solutions to project high intensities at these distances.In a separate study, we propose an improvement of the elemental analysis algorithm of LIBS spectrum. The algorithm is applied to the extit{in situ} online detection of KCl and H[dollar]_2[dollar]O content in potash fertilizer by LIBS, in which correlation regression modeling of LIBS spectra is combined with a machine learning algorithm that efficiently extracts the information related to elemental content changes from the complex online collected spectra, which greatly improves the detection speed while ensuring the detection accuracy and further enhances the competitiveness. (10.70675/bed26139z517az469dz922bzd20d050b3ddf)
DOI : 10.70675/bed26139z517az469dz922bzd20d050b3ddf
Testing the Scalar Weak Gravity Conjecture in No-scale Supergravity
- Dudas Emilian
- Gherghetta Tony
- Olive Keith A
- Verner Sarunas
, 2023. We explore possible extensions of the Weak Gravity Conjecture (WGC) to scalar field theories. To avoid charged black hole remnants, the WGC requires the existence of a particle with a mass $m < g q M_P$, with charge $q$ and U(1) gauge coupling $g$, allowing the decay to shed the black hole charge. Although there is no obvious problem that arises in the absence of a U(1) charge, it has been postulated that gravity must remain the weakest force even when extended to scalar interactions. Quantifying this conjecture may be done by comparing scalar and gravitational amplitudes, or as we advocate here by comparing scattering cross sections. In theories with non-trivial field space geometries, by working out examples with perturbation theory around arbitrary field values and performing tadpole resummations, we argue that the conjecture must be applied only at the extrema of the scalar potential (when expressed in locally canonical coordinates). We consider several toy models in the context of no-scale supergravity and also consider examples of inflationary models.
Landau Theory of Causal Dynamical Triangulations
- Benedetti Dario
, 2023, pp.1-49. Understanding the continuum limit of a theory of discrete random geometries is a beautiful but difficult challenge. In this optic, we review here the insights that can be obtained for Causal Dynamical Triangulations (CDT) by employing the Landau approach to critical phenomena. In particular, concentrating on the cases of two and three dimensions, we will make the case that the configuration of the volume of spatial slices effectively plays the role of an order parameter, helping us to understand the phase structure of CDT. Moreover, consistency with numerical simulations of CDT provides hints that the effective field theory of the model lives in the space of theories invariant under foliation-preserving diffeomorphisms. Among such theories, Horava-Lifshitz gravity has the special status of being a perturbatively renormalizable theory, while General Relativity sits in a subspace with enhanced symmetry. In order to reach either of them, one would likely need to fine tune some of the parameters in the CDT action, or additional ones from some generalization thereof. (10.1007/978-981-19-3079-9_93-1)
DOI : 10.1007/978-981-19-3079-9_93-1
The case for an EIC Theory Alliance: Theoretical Challenges of the EIC
- Abir Raktim
- Akushevich Igor
- Altinoluk Tolga
- Anderle Daniele Paolo
- Aslan Fatma P.
- Bacchetta Alessandro
- Balantekin Baha
- Barata Joao
- Battaglieri Marco
- Bertulani Carlos A.
- Beuf Guillaume
- Bissolotti Chiara
- Boer Daniël
- Boglione M.
- Boughezal Radja
- Braaten Eric
- Brambilla Nora
- Braun Vladimir
- Byer Duane
- Celiberto Francesco Giovanni
- Chien Yang-Ting
- Cloët Ian C.
- Constantinou Martha
- Cosyn Wim
- Courtoy Aurore
- Czajka Alexander
- d'Alesio Umberto
- Bozzi Giuseppe
- Danilkin Igor
- Das Debasish
- de Florian Daniel
- Delgado Andrea
- de Melo J. P. B. C.
- Detmold William
- Döring Michael
- Dumitru Adrian
- Echevarria Miguel G.
- Edwards Robert
- Eichmann Gernot
- El-Bennich Bruno
- Engelhardt Michael
- Fernandez-Ramirez Cesar
- Fischer Christian
- Fox Geofrey
- Freese Adam
- Gamberg Leonard
- Garzelli Maria Vittoria
- Giacosa Francesco
- da Silveira Gustavo Gil
- Glazier Derek
- Goncalves Victor P.
- Grossberndt Silas
- Guo Feng-Kun
- Gupta Rajan
- Hatta Yoshitaka
- Hentschinski Martin
- Blin Astrid Hiller
- Boughezal Radja
- Hobbs Timothy
- Ilyichev Alexander
- Jalilian-Marian Jamal
- Ji Chueng-Ryong
- Jia Shuo
- Kang Zhong-Bo
- Karki Bishnu
- Ke Weiyao
- Khachatryan Vladimir
- Kharzeev Dmitri
- Klein Spencer R.
- Korepin Vladimir
- Kovchegov Yuri
- Kriesten Brandon
- Kumano Shunzo
- Lai Wai Kin
- Lebed Richard
- Lee Christopher
- Lee Kyle
- Li Hai Tao
- Liao Jifeng
- Lin Huey-Wen
- Liu Keh-Fei
- Liuti Simonetta
- Lorcé Cédric
- Machado Magno V. T.
- Mantysaari Heikki
- Mathieu Vincent
- Mathur Nilmani
- Mehtar-Tani Yacine
- Melnitchouk Wally
- Mereghetti Emanuele
- Metz Andreas
- Michel Johannes K. L.
- Miller Gerald
- Mkrtchyan Hamlet
- Mukherjee Asmita
- Mukherjee Swagato
- Mulders Piet
- Munier Stéphane
- Murgia Francesco
- Nadolsky P. M.
- Negele John W
- Neill Duff
- Nemchik Jan
- Nocera E.
- Okorokov Vitalii
- Olness Fredrick
- Pasquini Barbara
- Peng Chao
- Petreczky Peter
- Petriello Frank
- Pilloni Alessandro
- Pire Bernard
- Pisano Cristian
- Pitonyak Daniel
- Praszalowicz Michal
- Prokudin Alexei
- Qiu Jianwei
- Radici Marco
- Raya Khépani
- Ringer Felix
- West Jennifer Rittenhouse
- Rodas Arkaitz
- Rodini Simone
- Rojo Juan
- Salazar Farid
- Santopinto Elena
- Sargsian Misak
- Sato Nobuo
- Schenke Bjoern
- Schindler Stella
- Schnell Gunar
- Schweitzer Peter
- Scimemi Ignazio
- Segovia Jorge
- Semenov-Tian-Shansky Kirill
- Shanahan Phiala
- Shao Ding-Yu
- Sievert Matt
- Signori Andrea
- Singh Rajeev
- Skokov Vladi
- Song Qin-Tao
- Srednyak Stanislav
- Stewart Iain W.
- Sufian Raza Sabbir
- Swanson Eric
- Syritsyn Sergey
- Szczepaniak Adam
- Sznajder Pawel
- Tandogan Asli
- Tawabutr Yossathorn
- Tawfik A.
- Terry John
- Toll Tobias
- Tomalak Oleksandr
- Twagirayezu Fidele
- Venugopalan Raju
- Vitev Ivan
- Vladimirov Alexey
- Vogelsang Werner
- Vogt Ramona
- Vujanovic Gojko
- Waalewijn Wouter
- Wang Xiang-Peng
- Xiao Bo-Wen
- Xing Hongxi
- Yang Yi-Bo
- Yao Xiaojun
- Yuan Feng
- Zhao Yong
- Zurita Pia
, 2023. We outline the physics opportunities provided by the Electron Ion Collider (EIC). These include the study of the parton structure of the nucleon and nuclei, the onset of gluon saturation, the production of jets and heavy flavor, hadron spectroscopy and tests of fundamental symmetries. We review the present status and future challenges in EIC theory that have to be addressed in order to realize this ambitious and impactful physics program, including how to engage a diverse and inclusive workforce. In order to address these many-fold challenges, we propose a coordinated effort involving theory groups with differing expertise is needed. We discuss the scientific goals and scope of such an EIC Theory Alliance.
Double DVCS as a window to the complete mapping of GPDs
- Deja K.
- Martinez-Fernandez V.
- Pire B.
- Sznajder P.
- Wagner J.
, 2023. Double deeply virtual Compton scattering (DDVCS) is the process where an electron scatters off a nucleon and produces a lepton pair. The main advantage of this process in contrast with deeply virtual and timelike Compton scatterings (DVCS and TCS) is the possibility of directly measuring GPDs for $x\neq\pm\xi$ at leading order in $\alpha_s$ (LO). We present a new calculation of the DDVCS amplitude based on spinor techniques which produce expressions for amplitudes that are perfectly suited for their implementation in numerical simulations. Elements of impact studies, including predictions for experiments at JLab12, JLab20+ and the Electron-Ion Collider (EIC), are studied by means of the PARTONS software and the EpIC Monte Carlo event generator.
Quantum many-body physics II: Models and methods
- Sanchez-Palencia Laurent
, 2023.
Quantum many-body physics III: Quantum simulation of disordered and quasiperiodic models
- Sanchez-Palencia Laurent
, 2023.
Quantum many-body physics I: Introduction
- Sanchez-Palencia Laurent
, 2023.
Numerical tools for burning plasmas
- Mishchenko A
- Biancalani A
- Borchardt M
- Bottino A
- Briguglio S
- Dumont R
- Ferreira J
- Graves J
- Hayward-Schneider T
- Kleiber R
- Könies A
- Lanti E
- Lauber Ph
- Leyh H
- Lu Z
- Lütjens Hinrich
- Mcmillan B
- Campos Pinto M
- Poli E
- Rettino B
- Rofman B
- Sama Juvert Njeck
- Slaby C
- Vannini F
- Villard L
- Vlad G
- Wang X
- Widmer F
- Zonca F
Plasma Physics and Controlled Fusion, IOP Publishing, 2023, 65 (6), pp.064001. Abstract The software stack under development within a European coordinated effort on tools for burning plasma modelling is presented. The project is organised as a Task (TSVV Task 10) under the new E-TASC initiative (Litaudon et al 2022 Plasma Phys. Control. Fusion 64 034005). This is a continued effort within the EUROfusion inheriting from the earlier European coordination projects as well as research projects based at various European laboratories. The ongoing work of the TSVV Tasks is supported by the Advanced Computing Hubs. Major projects requiring the high performance computing (HPC) resources are global gyrokinetic codes and global hybrid particle-magnetohydrodynamics (MHD) codes. Also applications using the integrated modelling tools, such as the Energetic-Particle Workflow, based on the ITER Integrated Modelling & Analysis Suite (IMAS), or the code package for modelling radio-frequency heating and fast-ion generation may require intensive computation and a substantial memory footprint. The continual development of these codes both on the physics side and on the HPC side allows us to tackle frontier problems, such as the interaction of turbulence with MHD-type modes in the presence of fast particles. One of the important mandated outcomes of the E-TASC project is the IMAS-enabling of EUROfusion codes and release of the software stack to the EUROfusion community. (10.1088/1361-6587/acce68)
DOI : 10.1088/1361-6587/acce68
Extended regime of metastable metallic and insulating phases in a two-orbital electronic system
- Vandelli M.
- Kaufmann J.
- Harkov V.
- Lichtenstein A.
- Held K.
- Stepanov E.
Physical Review Research, American Physical Society, 2023, 5 (2), pp.L022016. (10.1103/PhysRevResearch.5.L022016)
DOI : 10.1103/PhysRevResearch.5.L022016
de Sitter Connectivity from Holographic Entanglement
- Franken Victor
, 2024, CORFU2023, pp.225. Considering two antipodal observers in de Sitter space, we illustrate how spacetime connectivity between the holographic screens located on the (stretched) horizons emerges from holographic entanglement. To do so, we construct a covariant holographic entanglement entropy prescription in de Sitter space, including quantum corrections. While this prescription is inspired by the bilayer proposal, we argue that the monolayer proposal appears to be inconsistent. Entanglement wedge reconstruction implies an extension of static patch holography where the exterior region connecting the static patches is included, and reconstructible from the two screens. A phase transition occurs where there is an exchange of dominance between two competing quantum extremal surfaces, leading to a transfer of the encoding of the exterior region from one screen to the other. The effects in the bulk of integrating out degrees of freedom from the screens are discussed. (10.22323/1.463.0225)
DOI : 10.22323/1.463.0225
Saturation of fishbone instability by self-generated zonal flows in tokamak plasmas
- Brochard G.
- Liu C.
- Wei X.
- Heidbrink W.
- Lin Z.
- Gorelenkov N.
- Chrystal C.
- Du X.
- Bao J.
- Polevoi A. R.
- Schneider M.
- Kim S. H.
- Pinches S. D.
- Liu P.
- Nicolau J. H.
- Lütjens H.
, 2023. Gyrokinetic simulations of the fishbone instability in DIII-D tokamak plasmas find that self-generated zonal flows can dominate the nonlinear saturation by preventing coherent structures from persisting or drifting in the energetic particle phase space when the mode frequency down-chirps. Results from the simulation with zonal flows agree quantitatively, for the first time, with experimental measurements of the fishbone saturation amplitude and energetic particle transport. Moreover, the fishbone-induced zonal flows are likely responsible for the formation of an internal transport barrier that was observed after fishbone bursts in this DIII-D experiment. Finally, gyrokinetic simulations of a related ITER baseline scenario show that the fishbone induces insignificant energetic particle redistribution and may enable high performance scenarios in ITER burning plasma experiments.

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