Theoretical astrophysics and plasma physics at RPC

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

Nuclear Fusion IOP Publishing 64:11 (2024) 112017

Authors:

JR Harrison, A Aboutaleb, S Ahmed, M Aljunid, SY Allan, H Anand, Y Andrew, LC 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, PK Browning, D Brunetti, P Bryant, J Bryant, J Buchanan, N Bulmer, A Carruthers, M Cecconello, ZP Chen, J Clark, C Cowley, M Coy, N Crocker, G Cunningham, I Cziegler, T Da Assuncao, Y Damizia, P Davies, IE Day, GL Derks, S Dixon, R Doyle, M Dreval, M Dunne, BP Duval, T Eagles, J Edmond, H El-Haroun, SD Elmore, Y Enters, M Faitsch, F Federici, N Fedorczak, F Felici, AR Field, M Fitzgerald, I Fitzgerald, R Fitzpatrick, L Frassinetti, W Fuller, D Gahle, J Galdon-Quiroga, L Garzotti, S Gee, T Gheorghiu, S Gibson, KJ Gibson, C Giroud, D Greenhouse, VH Hall-Chen, CJ Ham, R Harrison, SS Henderson, C Hickling, B Hnat, L Howlett, J Hughes, R Hussain, K Imada, P Jacquet, P Jepson, B Kandan, I Katramados, YO Kazakov, D King, R King, A Kirk, M Knolker, M Kochan, L Kogan, B Kool, M Kotschenreuther, M Lees, AW Leonard, G Liddiard, B Lipschultz, YQ Liu, BA 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, KG McClements, J McClenaghan, D McConville, K McKay, C McKnight, P McKnight, A McLean, BF McMillan, A McShee, J Measures, N Mehay, CA Michael, F Militello, D Morbey, S Mordijck, D Moulton, O Myatra, AO Nelson, M Nicassio, MG O’Mullane, HJC Oliver, P Ollus, T Osborne, N Osborne, E Parr, B Parry, BS 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, JF Rivero-Rodriguez, CM 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, VA Soukhanovskii, D Speirs, G Staebler, R Stephen, P Stevenson, J Stobbs, M Stott, C Stroud, C Tame, C Theiler, N Thomas-Davies, AJ Thornton, M Tobin, M Vallar, RGL Vann, L Velarde, K Verhaegh, E Viezzer, C Vincent, G Voss, M Warr, W Wehner, S Wiesen, TA Wijkamp, D Wilkins, T Williams, T Wilson, HR Wilson, H Wong, M Wood, V Zamkovska
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Linearised Fokker–Planck collision model for gyrokinetic simulations

Plasma Physics and Controlled Fusion IOP Publishing 66:10 (2024) 105016-105016

Authors:

A von Boetticher, FI Parra, M Barnes

Abstract:

Abstract We introduce a gyrokinetic, linearised Fokker–Planck collision model that satisfies conservation laws and is accurate at arbitrary collisionalities. The differential test-particle component of the operator is exact; the integral field-particle component is approximated using a spherical harmonic and a modified Laguerre polynomial expansion developed by Hirshman and Sigmar (1976 Phys. Fluids 19 1532). The numerical methods of the implementation in the δf-gyrokinetic code stella (Barnes et al 2019 J. Comput. Phys. 391 365–80) are discussed, and conservation properties of the operator are demonstrated. The collision model is then benchmarked against the collision model of the gyrokinetic solver GS2 in the limiting cases of a reduced test-particle collision operator and energy- and momentum-conserving operator. The accuracy of the full collision model is investigated by solving the parallel Spitzer-Härm problem for the transport coefficients. It is shown that retaining collisional energy flux and higher-order terms in the field-particle operator reduces errors in the transport coefficients from 10%–25% for a simple momentum- and energy-conserving model to under 1%.
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Disc novae: Thermodynamics of gas assisted binary black hole formation in AGN discs

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2024) stae1866

Authors:

Henry Whitehead, Connar Rowan, Tjarda Boekholt, Bence Kocsis
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Stochastic gravitational wave background from highly-eccentric stellar-mass binaries in the millihertz band

Physical Review D American Physical Society (APS) 110:2 (2024) 023020

Authors:

Zeyuan Xuan, Smadar Naoz, Bence Kocsis, Erez Michaely
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Dynamical evolution of Milky Way globular clusters on the cosmological timescale I. Mass loss and interaction with the nuclear star cluster

ArXiv 2406.18987 (2024)

Authors:

M Ishchenko, P Berczik, T Panamarev, D Kuvatova, M Kalambay, A Gluchshenko, O Veles, M Sobolenko, O Sobodar, C Omarov
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