Prof Roman Walczak: Publications

Measurement of the cross-section ratio sigma(psi(2S))/sigma(J/psi(1S)) in deep inelastic exclusive ep scattering at HERA

NUCLEAR PHYSICS B 909 (2016) 934-953

Authors:

H Abramowicz, I Abt, L Adamczykh, M Adamus, S Antonelli, V Aushev, Y Aushev, O Behnke, U Behrens, A Bertolin, I Bloch, EG Boos, K Borras, I Brock, NH Brook, R Brugnera, A Bruni, PJ Bussey, A Caldwell, M Capua, CD Catterall, J Chwastowski, J Ciborowski, R Ciesielski, AM Cooper-Sarkar, M Corradi, F Corriveau, RK Dementiev, RCE Devenish, G Dolinska, S Dusini, J Figiel, B Foster, G Gach, E Gallo, A Garfagnini, A Geiser, A Gizhko, LK Gladilin, YA Golubkov, J Grebenyuk, I Gregor, G Grzelak, O Gueta, M Guzik, W Hain, D Hochman, R Hori, ZA Ibrahim, Y Iga, M Ishitsuka, A Iudin, F Januschek, NZ Jomhari, I Kadenko, S Kananov, U Karshon, M Kaur, P Kaur, D Kisielewska, R Klanner, U Klein, N Kondrashova, O Kononenko, I Korol, IA Korzhavina, A Kotanski, U Koetz, N Kovalchuk, H Kowalski, B Krupa, O Kuprash, M Kuze, BB Levchenko, A Levy, V Libov, S Limentani, M Lisovyi, E Lobodzinska, B Loehr, E Lohrmann, A Longhin, D Lontkovskyi, OY Lukina, I Makarenko, J Malka, S Mergelmeyer, FM Idris, NM Nasir, V Myronenko, K Nagano, T Nobe, D Notz, RJ Nowak, Y Onishchuk, E Paul, W Perlanski, NS Pokrovskiy, M Przybycien, P Roloff, I Rubinsky, M Ruspa, DH Saxon, M Schioppa, WB Schmidke, U Schneekloth, T Schoerner-Sadenius, LM Shcheglova, R Shevchenko, O Shkola, Y Shyrma, I Singh, IO Skillicorn, W Slominski, A Solano, L Stanco, N Stefaniuk, A Stern, P Stopa, J Sztuk-Dambietz, D Szuba, J Szuba, E Tassi, K Tokushuku, J Tomaszewska, A Trofymov, T Tsurugai, M Turcato, O Turkot, T Tymieniecka, A Verbytskyi, O Viazlo, R Walczak, WATW Abdullah, K Wichmann, M Wing, G Wolf, S Yamada, Y Yamazaki, N Zakharchuk, AF Zarnecki, L Zawiejski, O Zenaiev, BO Zhautykov, N Zhmak, DS Zotkin, ZEUS Collaboration

Generation of laser pulse trains for tests of multi-pulse laser wakefield acceleration

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Elsevier 829 (2016) 383-385

Authors:

Robert Shalloo, L Corner, C Arran, J Cowley, G Cheung, C Thornton, R Walczak, SM Hooker

Abstract:

In multi-pulse laser wakefield acceleration (MP-LWFA) a plasma wave is driven by a train of low-energy laser pulses separated by the plasma period, an approach which offers a route to driving plasma accelerators with high efficiency and at high pulse repetition rates using emerging technologies such as fibre and thin-disk lasers. Whilst these laser technologies are in development, proof-of-principle tests of MP-LWFA require a pulse train to be generated from a single, high-energy ultrafast pulse. Here we demonstrate the generation of trains of up to 7 pulses with pulse separations in the range 150–170 fs from single 40 fs pulses produced by a Ti:sapphire laser.

Generation of laser pulse trains for tests of multi-pulse laser wakefield acceleration

Nuclear Instruments and Methods in Physics Research A Elsevier 829 (2016) 383-385

Authors:

Simon Hooker, L Corner, C Arran, J Cowley, G Cheung, C Thornton, R Walczak

Abstract:

Production of exclusive dijets in diffractive deep inelastic scattering at HERA

European Physical Journal C Springer Berlin Heidelberg 76:1 (2016) 1-18

Authors:

H Abramowicz, I Abt, L Adamczyk, M Adamus, S Antonelli, V Aushev, Y Aushev, O Behnke, U Behrens, A Bertolin, I Bloch, EG Boos, K Borras, I Brock, NH Brook, R Brugnera, A Bruni, PJ Bussey, A Caldwell, M Capua, CD Catterall, J Chwastowski, J Ciborowski, R Ciesielski, AM Cooper-Sarkar

Abstract:

Production of exclusive dijets in diffractive deep inelastic e±p scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 372 pb-1. The measurement was performed for γ∗–p centre-of-mass energies in the range 9025GeV2. Energy flows around the jet axis are presented. The cross section is presented as a function of β and ϕ, where β=x/xIP, x is the Bjorken variable and xIP is the proton fractional longitudinal momentum loss. The angle ϕ is defined by the γ∗–dijet plane and the γ∗–e± plane in the rest frame of the diffractive final state. The ϕ cross section is measured in bins of β. The results are compared to predictions from models based on different assumptions about the nature of the diffractive exchange.

Accelerators

Chapter in Particle Physics in the LHC Era, Oxford University Press (OUP) (2016) 48-70

Authors:

G Barr, R Devenish, R Walczak, T Weidberg

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