Publications


Novel Type of inertial actuator for satellite attitude control system basis on concept of reaction sphere-ELSA project

Annual Review of Earth and Planetary Sciences 24 (2015) 85-92

R Wawrzaszek, M Sidz, M Strumik, M Banaszkiewicz, K Seweryn, Wisniewski, L Rossini, E Onillon

© Springer International Publishing Switzerland 2015.Magnetically levitated reaction sphere systems are considered as a new type of actuator dedicated for satellites ACS system. Inertial Attitude Control Systems used in spacecrafts, traditionally consists of one to four reaction wheels (RW) or control moment gyroscopes (CMG). In a principle, the attitude of the satellite can be changed by the reaction to the acceleration of the appropriate wheel. In practice, for optimization, redundancy purposes and ability to three-axis attitude stabilization, four or five wheels are common. Another approach, which states a general base for this work, assumes use of a single reaction sphere which can be accelerated in any direction instead of set of reaction wheels. The sphere can be accelerated in any direction by a three dimensional (3D) motor. Because of its unparalleled symmetry, a hollow sphere delivers constantly a maximum inertia independently of its current rotation axis. A solution investigated here consists in a rotating permanent magnet spherical rotor enclosed in a multi-coil stator. In opposition to conventional ball bearing momentum exchange devices, rotor in this solution levitates magnetically what results in absence of friction and increase of performance. The sphere can be accelerated in any direction by a three dimensional (3D) motor, making the three axes of the spacecraft controllable by just a single device. Furthermore, a hollow sphere has the natural optimal multi axis inertiato- mass and-volume ratios.


A fast algorithm for estimating actions in triaxial potentials

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 447 (2015) 2479-2496

JL Sanders, J Binney


Ultrafast collisional ion heating by electrostatic shocks.

Nature communications 6 (2015) 8905-

AE Turrell, M Sherlock, SJ Rose

High-intensity lasers can be used to generate shockwaves, which have found applications in nuclear fusion, proton imaging, cancer therapies and materials science. Collisionless electrostatic shocks are one type of shockwave widely studied for applications involving ion acceleration. Here we show a novel mechanism for collisionless electrostatic shocks to heat small amounts of solid density matter to temperatures of ∼keV in tens of femtoseconds. Unusually, electrons play no direct role in the heating and it is the ions that determine the heating rate. Ions are heated due to an interplay between the electric field of the shock, the local density increase during the passage of the shock and collisions between different species of ion. In simulations, these factors combine to produce rapid, localized heating of the lighter ion species. Although the heated volume is modest, this would be one of the fastest heating mechanisms discovered if demonstrated in the laboratory.


Self-consistent inclusion of classical large-angle Coulomb collisions in plasma Monte Carlo simulations

Journal of Computational Physics 299 (2015) C

AE Turrell, M Sherlock, SJ Rose


3D MODELS OF SYMBIOTIC BINARIES

PHYSICS OF EVOLVED STARS: A CONFERENCE DEDICATED TO THE MEMORY OF OLIVIER CHESNEAU 71-72 (2015) 81-86

S Mohamed, R Booth, P Podsiadlowski, S Ramstedt, W Vlemmings, M Maercker, T Lanz


How rare is the Bullet Cluster (in a Lambda CDM universe)?

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2015) ARTN 050

D Kraljic, S Sarkar


Intrinsic rotation in tokamaks: theory

PLASMA PHYSICS AND CONTROLLED FUSION 57 (2015) ARTN 045002

FI Parra, M Barnes


The Cherenkov Telescope Array potential for the study of young supernova remnants

ASTROPARTICLE PHYSICS 62 (2015) 152-164

BS Acharya, C Aramo, A Babic, JA Barrio, A Baushev, JB Tjus, D Berge, M Bohacova, A Bonardi, A Brown, V Bugaev, T Bulik, M Burton, G Busetto, P Caraveo, R Carosi, J Carr, P Chadwick, J Chudoba, V Conforti, V Connaughton, JL Contreras, G Cotter, F Dazzi, A De Franco, I de la Calle, RDLR Lopez, B De Lotto, F De Palma, T Di Girolamo, C Di Giulio, F Di Pierro, J-L Dournaux, V Dwarkadas, J Ebr, K Egberts, M Fesquet, H Fleischhack, L Font, G Fontaine, A Foerster, M Fuessling, B Garcia, RG Lopez, M Garczarczyk, F Gargano, D Garrido, M Gaug, N Giglietto, F Giordano, A Giuliani, N Godinovic, MM Gonzalez, T Grabarczyk, T Hassan, J Hoerandel, M Hrabovsky, D Hrupec, TB Humensky, J Huovelin, M Jamrozy, P Janecek, PE Kaaret, U Katz, S Kaufmann, B Khelifi, W Kluzniak, J Kocot, N Komin, H Kubo, J Kushida, G Lamanna, WH Lee, J-P Lenain, T Lohse, S Lombardi, R Lopez-Coto, A Lopez-Oramas, F Lucarelli, MC Maccarone, G Maier, P Majumdar, G Malaguti, D Mandat, MN Mazziotta, K Meagher, N Mirabal, A Morselli, E Moulin, J Niemiec, M Nievas, K Nishijima, D Nosek, F Nunio, M Ohishi, S Ohm, RA Ong, R Orito, N Otte, M Palatka, G Pareschi, M Pech, M Persic, M Pohl, M Prouza, A Quirrenbach, S Raino, GR Fernandez, P Romano, AC Rovero, B Rudak, P Schovanek, M Shayduk, H Siejkowski, A Sillanpaa, S Stefanik, T Stolarczyk, M Szanecki, T Szepieniec, LA Tejedor, I Telezhinsky, M Teshima, L Tibaldo, O Tibolla, G Tovmassian, P Travnicek, M Trzeciak, P Vallania, C van Eldik, S Vercellone, C Vigorito, SJ Wagner, SP Wakely, A Weinstein, A Wierzcholska, A Wilhelm, P Wojcik, T Yoshikoshi


Inertial-range kinetic turbulence in pressure-anisotropic astrophysical plasmas

JOURNAL OF PLASMA PHYSICS 81 (2015) ARTN 325810501

MW Kunz, AA Schekochihin, CHK Chen, IG Abel, SC Cowley


Quantitative single shot and spatially resolved plasma wakefield diagnostics

PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS 18 (2015) ARTN 081302

MF Kasim, J Holloway, L Ceurvorst, MC Levy, N Ratan, J Sadler, R Bingham, PN Burrows, R Trines, M Wing, P Norreys


Gas flow in barred potentials - II. Bar-driven spiral arms

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 451 (2015) 3437-3452

MC Sormani, J Binney, J Magorrian


Ultrabright X-ray laser scattering for dynamic warm dense matter physics

NATURE PHOTONICS 9 (2015) 274-279

LB Fletcher, HJ Lee, T Doeppner, E Galtier, B Nagler, P Heimann, C Fortmann, S LePape, T Ma, M Millot, A Pak, D Turnbull, DA Chapman, DO Gericke, J Vorberger, T White, G Gregori, M Wei, B Barbrel, RW Falcone, C-C Kao, H Nuhn, J Welch, U Zastrau, P Neumayer, JB Hastings, SH Glenzer


INEFFICIENT DRIVING OF BULK TURBULENCE BY ACTIVE GALACTIC NUCLEI IN A HYDRODYNAMIC MODEL OF THE INTRACLUSTER MEDIUM

ASTROPHYSICAL JOURNAL 815 (2015) ARTN 41

CS Reynolds, SA Balbus, AA Schekochihin


Investigation of the solid-liquid phase transition of carbon at 150 GPa with spectrally resolved X-ray scattering

HIGH ENERGY DENSITY PHYSICS 14 (2015) 38-43

J Helfrich, D Kraus, A Ortner, S Frydrych, G Schaumann, NJ Hartley, G Gregori, B Kettle, D Riley, DC Carroll, MM Notley, C Spindloe, M Roth


On the interpretation of dark matter self-interactions in Abell 3827

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 452 (2015) L54-L58

F Kahlhoefer, K Schmidt-Hoberg, J Kummer, S Sarkar


Intrinsic alignment of simulated galaxies in the cosmic web: implications for weak lensing surveys

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 448 (2015) 3391-3404

S Codis, R Gavazzi, Y Dubois, C Pichon, K Benabed, V Desjacques, D Pogosyan, J Devriendt, A Slyz


Pellet ignition using ions shock accelerated in the corona

42nd European Physical Society Conference on Plasma Physics, EPS 2015 (2015)

RA Cairns, E Boella, M Vranic, LO Silva, R Trines, P Norreys, R Bingham


Compression of X-ray Free Electron Laser Pulses to Attosecond Duration.

Scientific reports 5 (2015) 16755-

JD Sadler, R Nathvani, P Oleśkiewicz, LA Ceurvorst, N Ratan, MF Kasim, RM Trines, R Bingham, PA Norreys

State of the art X-ray Free Electron Laser facilities currently provide the brightest X-ray pulses available, typically with mJ energy and several hundred femtosecond duration. Here we present one- and two-dimensional Particle-in-Cell simulations, utilising the process of stimulated Raman amplification, showing that these pulses are compressed to a temporally coherent, sub-femtosecond pulse at 8% efficiency. Pulses of this type may pave the way for routine time resolution of electrons in nm size potentials. Furthermore, evidence is presented that significant Landau damping and wave-breaking may be beneficial in distorting the rear of the interaction and further reducing the final pulse duration.


Contemporary particle-in-cell approach to laser-plasma modelling

PLASMA PHYSICS AND CONTROLLED FUSION 57 (2015) ARTN 113001

TD Arber, K Bennett, CS Brady, A Lawrence-Douglas, MG Ramsay, NJ Sircombe, P Gillies, RG Evans, H Schmitz, AR Bell, CP Ridgers


Early flattening of dark matter cusps in dwarf spheroidal galaxies

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 446 (2015) 1820-1828

C Nipoti, J Binney