Measurement of D*± production in deep inelastic scattering at HERA
Journal of High Energy Physics 2013:5 (2013)
Abstract:
The production of D *± mesons in deep inelastic ep scattering has been measured for exchanged photon virtualities 5 < Q 2 < 1000 GeV2, using an integrated luminosity of 363 pb-1 with the ZEUS detector at HERA. Differential cross sections have been measured and compared to next-to-leading-order QCD calculations. The cross-sections are used to extract the charm contribution to the proton structure functions, expressed in terms of the reduced charm cross section, σredc̄c. Theoretical calculations based on fits to inclusive HERA data are compared to the results. © 2013 SISSA.Combination and QCD analysis of charm production cross section measurements in deep-inelastic ep scattering at HERA
EUROPEAN PHYSICAL JOURNAL C 73:2 (2013) ARTN 2311
Laserwire: A high resolution non-invasive beam profiling diagnostic
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2013)
Abstract:
A laserwire is a non-invasive, high resolution particle beam size monitor based on Compton scattering that is required for future planned colliders and can also be used to estimate the size of the source in wakefield acceleration experiments. We present recent results from the high resolution laserwire transverse electron beam diagnostic installed at the Accelerator Test Facility 2 (ATF2) electron accelerator at KEK in Japan. Full characterisation of the propagation of the 150 mJ, 77 ps laser beam is used to deconvolve the transverse laserwire profile demonstrating the successful measurement of 1 μm scale vertical electron beam sizes, even with extreme aspect ratios. We also present progress in the development of high energy photonic crystal fibre based laser systems for laserwire measurements at megahertz repetition rates, suitable for intra-train scanning for planned accelerators such as the International Linear Collider, or beam size measurement in laser or particle driven plasma accelerators. © 2013 Elsevier B.V. All rights reserved.Multiple pulse resonantly enhanced laser plasma wakefield acceleration
AIP Conference Proceedings 1507 (2012) 872-873
Abstract:
We present an outline of experiments being conducted at Oxford University on multiple-pulse, resonantly-enhanced laser plasma wakefield acceleration. This method of laser plasma acceleration uses trains of optimally spaced low energy short pulses to drive plasma oscillations and may enable laser plasma accelerators to be driven by compact and efficient fibre laser sources operating at high repetition rates. © 2012 American Institute of Physics.Inclusive-jet photoproduction at HERA and determination of α s
Nuclear Physics B 864:1 (2012) 1-37