Publications


Intuition for the radial penetration of flux surface shaping in tokamaks

PLASMA PHYSICS AND CONTROLLED FUSION 57 (2015) ARTN 035006

J Ball, FI Parra


Mitigating the relativistic laser beam filamentation via an elliptical beam profile.

Physical review. E, Statistical, nonlinear, and soft matter physics 92 (2015) 053106-

TW Huang, CT Zhou, AP Robinson, B Qiao, H Zhang, SZ Wu, HB Zhuo, PA Norreys, XT He

It is shown that the filamentation instability of relativistically intense laser pulses in plasmas can be mitigated in the case where the laser beam has an elliptically distributed beam profile. A high-power elliptical Gaussian laser beam would break up into a regular filamentation pattern-in contrast to the randomly distributed filaments of a circularly distributed laser beam-and much more laser power would be concentrated in the central region. A highly elliptically distributed laser beam experiences anisotropic self-focusing and diffraction processes in the plasma channel ensuring that the unstable diffractive rings of the circular case cannot be produced. The azimuthal modulational instability is thereby suppressed. These findings are verified by three-dimensional particle-in-cell simulations.


KINEMATIC DETECTION OF THE GALACTIC NUCLEAR DISK

ASTROPHYSICAL JOURNAL LETTERS 812 (2015) ARTN L21

R Schoenrich, M Aumer, SE Sale


The impact of occupancy patterns, occupant-controlled ventilation and shading on indoor overheating risk in domestic environments

BUILDING AND ENVIRONMENT 78 (2014) 183-198

A Mavrogianni, M Davies, J Taylor, Z Chalabi, P Biddulph, E Oikonomou, P Das, B Jones


The second data release of the INT Photometric Ha Survey of the Northern Galactic Plane (IPHAS DR2)

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 444 (2014) 3230-3257

G Barentsen, HJ Farnhill, JE Drew, EA Gonzalez-Solares, R Greimel, MJ Irwin, B Miszalski, C Ruhland, P Groot, A Mampaso, SE Sale, AA Henden, A Aungwerojwit, MJ Barlow, PJ Carter, RLM Corradi, JJ Drake, J Eisloeffel, J Fabregat, BT Gaensicke, NPG Fusillo, S Greiss, AS Hales, S Hodgkin, L Huckvale, J Irwin, R King, C Knigge, T Kupfer, E Lagadec, DJ Lennon, JR Lewis, M Mohr-Smith, RAH Morris, T Naylor, QA Parker, S Phillipps, S Pyrzas, R Raddi, GHA Roelofs, P Rodriguez-Gil, L Sabin, S Scaringi, D Steeghs, J Suso, R Tata, YC Unruh, J van Roestel, K Viironen, JS Vink, NA Walton, NJ Wright, AA Zijlstra


Observations of strong ion-ion correlations in dense plasmas

PHYSICS OF PLASMAS 21 (2014) ARTN 056302

T Ma, L Fletcher, A Pak, DA Chapman, RW Falcone, C Fortmann, E Galtier, DO Gericke, G Gregori, J Hastings, OL Landen, S Le Pape, HJ Lee, B Nagler, P Neumayer, D Turnbull, J Vorberger, TG White, K Wuensch, U Zastrau, SH Glenzer, T Doeppner


Performance of the K-band multi-object spectrograph (KMOS) on the ESO VLT

GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V 9147 (2014)

R Sharples, R Bender, AA Berbel, R Bennett, N Bezawada, R Castillo, M Cirasuolo, P Clark, G Davidson, R Davies, R Davies, M Dubbeldam, A Fairley, G Finger, NF Schreiber, R Genzel, R Haefner, A Hess, I Jung, I Lewis, D Montgomery, J Murray, B Muschielok, J Pirard, S Ramsey, P Rees, J Richter, D Robertson, I Robson, S Rolt, R Saglia, I Saviane, J Schlichter, L Schmidtobreik, A Segovia, A Smette, M Tecza, S Todd, M Wegner, E Wiezorrek


HARMONI: the first light integral field spectrograph for the E-ELT

GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V 9147 (2014)

NA Thatte, F Clarke, I Bryson, H Schnetler, M Tecza, RM Bacon, A Remillieux, E Mediavilla, JM Herreros Linares, S Arribas, CJ Evans, DW Lunney, T Fusco, K O'Brien, IA Tosh, DJ Ives, G Finger, R Houghton, RL Davies, JD Lynn, JR Allen, SD Zieleniewski, S Kendrew, V Ferraro-Wood, A Pecontal-Rousset, J Kosmalski, J Richard, A Jarno, AM Gallie, DM Montgomery, D Henry, G Zins, D Freeman, B Garcia-Lorenzo, L Fernando Rodriguez-Ramos, J Sanchez-Capuchino Revuelta, E Hernandez-Suarez, A Bueno-Bueno, JV Gigante-Ripoll, A Garcia, K Dohlen, B Neichel


The ATLAS(3D) project - XXV. Two-dimensional kinematic analysis of simulated galaxies and the cosmological origin of fast and slow rotators

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 444 (2014) 3357-3387

T Naab, L Oser, E Emsellem, M Cappellari, D Krajnovic, RM McDermid, K Alatalo, E Bayet, L Blitz, M Bois, F Bournaud, M Bureau, A Crocker, RL Davies, TA Davis, PT de Zeeuw, P-A Duc, M Hirschmann, PH Johansson, S Khochfar, H Kuntschner, R Morganti, T Oosterloo, M Sarzi, N Scott, P Serra, G van de Ven, A Weijmans, LM Young


Local dependence of ion temperature gradient on magnetic configuration, rotational shear and turbulent heat flux in MAST

ArXiv (0)

Y-C Ghim, AR Field, AA Schekochihin, EG Highcock, C Michael, TMAST Team

Experimental data from the Mega Amp Spherical Tokamak (MAST) is used to show that the inverse gradient scale length of the ion temperature R/LTi (normalized to the major radius R) has its strongest local correlation with the rotational shear and the pitch angle of the magnetic field (or, equivalently, an inverse correlation with q/{\epsilon}, the safety factor/the inverse aspect ratio). Furthermore, R/LTi is found to be inversely correlated with the gyro-Bohm-normalized local turbulent heat flux estimated from the density fluctuation level measured using a 2D Beam Emission Spectroscopy (BES) diagnostic. These results can be explained in terms of the conjecture that the turbulent system adjusts to keep R/LTi close to a certain critical value (marginal for the excitation of turbulence) determined by local equilibrium parameters (although not necessarily by linear stability).


Molecular gas properties of the giant molecular cloud complexes in the arms and inter-arms of the spiral galaxy NGC 6946

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 437 (2014) 1434-1455

S Topal, E Bayet, M Bureau, TA Davis, W Walsh


Producing bright X-rays for imaging applications using a laser wakefield accelerator

Conference on Lasers and Electro-Optics Europe - Technical Digest 2014-January (2014)

SPD Mangles, MS Bloom, J Bryant, JM Cole, A Döpp, S Kneip, H Nakamura, K Poder, MJV Streeter, J Wood, Z Najmudin, R Bendoyro, J Jiang, NC Lopes, C Russo, O Cheklov, K Ertel, SJ Hawkes, CJ Hooker, D Neely, PA Norreys, PP Rajeev, DR Rusby, RHH Scott, DR Symes, J Holloway, M Wing, JF Seely

© 2014 Optical Society of America. We report on the generation of bright multi-keV betatron X-ray radiation using a GeV laser wakefield accelerator and investigate the use of these X-rays for various imaging applications.


The ATLAS(3D) project - XXVII. Cold gas and the colours and ages of early-type galaxies

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 444 (2014) 3408-3426

LM Young, N Scott, P Serra, K Alatalo, E Bayet, L Blitz, M Bois, F Bournaud, M Bureau, AF Crocker, M Cappellari, RL Davies, TA Davis, PT de Zeeuw, P-A Duc, E Emsellem, S Khochfar, D Krajnovic, H Kuntschner, RM McDermid, R Morganti, T Naab, T Oosterloo, M Sarzi, A-M Weijmans


The ATLAS(3D) project - XXIV. The intrinsic shape distribution of early-type galaxies

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 444 (2014) 3340-3356

A-M Weijmans, PT de Zeeuw, E Emsellem, D Krajnovic, P-Y Lablanche, K Alatalo, L Blitz, M Bois, F Bournaud, M Bureau, M Cappellari, AF Crocker, RL Davies, TA Davis, P-A Duc, S Khochfar, H Kuntschner, RM McDermid, R Morganti, T Naab, T Oosterloo, M Sarzi, N Scott, P Serra, GV Kleijn, LM Young


Erratum: "Correlations at large scales and the onset of turbulence in the fast solar wind" (2013, ApJ, 778, 177)

Astrophysical Journal 782 (2014)

RT Wicks, DA Roberts, A Mallet, AA Schekochihin, TS Horbury, CHK Chen


From cosmic ray source to the galactic pool

Monthly Notices of the Royal Astronomical Society 437 (2014) 2802-2805

KM Schure, AR Bell

The Galactic cosmic ray spectrum is a remarkably straight power law. Our current understanding is that the dominant sources that accelerate cosmic rays up to the knee (3 × 1015 eV) or perhaps even the ankle (3 × 1018 eV), are young Galactic supernova remnants. In theory, however, there are various reasons why the spectrum may be different for different sources, and may not even be a power law if non-linear shock acceleration applies during the most efficient stages of acceleration.We show how the spectrum at the accelerator translates to the spectrum that makes up the escaping cosmic rays that replenish the Galactic pool of cosmic rays. We assume that cosmic ray confinement, and thus escape, is linked to the level of magnetic field amplification, and that the magnetic field is amplified by streaming cosmic rays according to the non-resonant hybrid or resonant instability. When a fixed fraction of the energy is transferred to cosmic rays, it turns out that a source spectrum that is flatter than E-2 will result in an E-2 escape spectrum, whereas a steeper source spectrum will result in an escape spectrum with equal steepening. This alleviates some of the concern that may arise from expected flat or concave cosmic ray spectra associated with non-linear shock modification. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.


The relative importance of input weather data for indoor overheating risk assessment in dwellings

BUILDING AND ENVIRONMENT 76 (2014) 81-91

J Taylor, M Davies, A Mavrogianni, Z Chalabi, P Biddulph, E Oikonomou, P Das, B Jones


Using probabilistic sampling-based sensitivity analyses for indoor air quality modelling

BUILDING AND ENVIRONMENT 78 (2014) 171-182

P Das, C Shrubsole, B Jones, I Hamilton, Z Chalabi, M Davies, A Mavrogianni, J Taylor


A hadronic explanation of the lepton anomaly

COSMIC RAY ANISOTROPY WORKSHOP 2013 (CRA2013) 531 (2014) UNSP 012008

P Mertsch, S Sarkar, IOP


Suppression of local heat flux in a turbulent magnetized intracluster medium

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 440 (2014) 1153-1164

SV Komarov, EM Churazov, AA Schekochihin, JA ZuHone