R. Walczak
University of Oxford
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Featured researches published by R. Walczak.
European Physical Journal C | 1987
W. Braunschweig; R. Gerhards; F. J. Kirschfink; H.-U. Martyn; P. Rosskamp; B. Bock; J. Eisenmann; H. M. Fischer; H. Hartmann; E. Hilger; A. Jocksch; V. Mertens; R. Wedemeyer; B. Foster; A. J. Martin; A. J. Sephton; F. Barreiro; E. Bernardi; J. J. Chwastowski; Y. Eisenberg; A. Eskreys; K. Gather; H. Hultschig; K. Genser; P. Joos; H. Kowalski; A. Ladage; B. Löhr; D. Lüke; P. Mättig
AbstractWe present data on energy-energy correlations (EEC) and their related asymmetry (AEEC) ine+e− annihilation in the centre of mass energy range 12<W≦46.8 GeV. The energy and angular dependence of the EEC in the central region is well described byOαs2 QCD plus a fragmentation term proportional to
Journal of Physics B | 2014
Simon M. Hooker; R. Bartolini; S. P. D. Mangles; Andreas Tünnermann; L. Corner; Jens Limpert; Andrei Seryi; R. Walczak
European Physical Journal A | 1988
W. Braunschweig; R. Gerhards; F. J. Kirschfink; H.-U. Martyn; P. Rosskamp; B. Bock; H. M. Fischer; H. Hartmann; J. Hartmann; E. Hilger; A. Jocksch; V. Mertens; R. Wedemeyer; B. Foster; A. J. Martin; A. J. Sephton; F. Barreiro; E. Bernardi; J. J. Chwastowski; Y. Eisenberg; A. Eskreys; K. Gather; K. Genser; H. Hultschig; P. Joos; H. Kowalski; A. Ladage; B. Löhr; D. Lüke; P. Mättig
{1 \mathord{\left/ {\vphantom {1 {\sqrt s }}} \right. \kern-\nulldelimiterspace} {\sqrt s }}
Physical Review Letters | 2017
J. Cowley; C. Thornton; Christopher Arran; Robert Shalloo; L. Corner; Gavin Cheung; Christopher D. Gregory; S. P. D. Mangles; Nicholas H. Matlis; D. R. Symes; R. Walczak; Simon M. Hooker
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2001
Takashi Matsushita; Stewart Boogert; Robin Devenish; R. Walczak
. BareO(α)s2 QCD reproduces our data for the large angle region of the AEEC. Nonperturbative effects for the latter are estimated with the help of fragmentation models. From various analyses using different approximations, we find that values for
ieee particle accelerator conference | 2007
L. Deacon; S. Boogert; G.A. Blair; G. Boorman; Alessio Bosco; P. Karataev; L. Corner; Nicolas Delerue; B. Foster; F. Gannaway; David Howell; Myriam Newman; A. Reichold; Rohan Senanayake; R. Walczak; A. Aryshev; H. Hayano; Kiyoshi Kubo; Nobuhiro Terunuma; Junji Urakawa
European Physical Journal A | 1988
W. Braunschweig; R. Gerhards; F. J. Kirschfink; H.-U. Martyn; B. Bock; H. M. Fischer; H. Hartmann; J. Hartmann; E. Hilger; A. Jocksch; R. Wedemeyer; B. Foster; A. J. Martin; A. J. Sephton; F. Barreiro; E. Bernardi; J. J. Chwastowski; A. Eskreys; K. Gather; K. Genser; H. Hultschig; P. Joos; H. Kowalski; A. Ladage; B. Löhr; D. Lüke; P. Mättig; D. Notz; J. M. Pawlak; K. U. Pösnecker
\Lambda _{\overline {MS} }
Physical Review Special Topics-accelerators and Beams | 2014
Laurence Nevay; S. Boogert; P. Karataev; Konstantin Kruchinin; L. Corner; D. F. Howell; R. Walczak; A. Aryshev; J. Urakawa; Nobuhiro Terunuma
ADVANCED ACCELERATOR CONCEPTS: 15th Advanced Accelerator Concepts Workshop | 2013
L. Corner; R. Walczak; Laurence Nevay; S. Dann; Simon M. Hooker; N. Bourgeois; J. Cowley
in the range 0.1–0.3 GeV give a good description of the data. We also compare analytical calculations in QCD for the EEC in the back-to-back region to our data. The theoretical predictions describe well both the angular and energy dependence of the data in the back-to-back region.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2007
K. Korcsak-Gorzo; G. Grzelak; K. Oliver; M. Dawson; R. C. E. Devenish; J. Ferrando; T. Matsushita; P.D. Shield; R. Walczak
Laser-driven plasma accelerators can generate accelerating gradients three orders of magnitude larger than radio-frequency accelerators and have achieved beam energies above 1 GeV in centimetre long stages. However, the pulse repetition rate and wall-plug efficiency of laser plasma accelerators is limited by the driving laser to less than approximately 1 Hz and 0.1% respectively. Here we investigate the prospects for exciting the plasma wave with trains of lowenergy laser pulses rather than a single high-energy pulse. Resonantly exciting the wakefield in this way would enable the use of different technologies, such as fibre or thin-disc lasers, which are able to operate at multi-kilohertz pulse repetition rates and with wall-plug efficiencies two orders of magnitude higher than current laser systems. We outline the parameters of efficient, GeV-scale, 10 kHz plasma accelerators and show that they could drive compact x-ray sources with average photon fluxes comparable to those of third-generation light source but with significantly improved temporal resolution. Likewise free-electron laser (FEL) operation could be driven with comparable peak power but with significantly larger repetition rates than extant FELs.
