Laser-plasma accelerator group

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Laser-driven acceleration of electrons in a partially ionized plasma channel.

Phys Rev Lett 100:10 (2008) 105005

Authors:

TP Rowlands-Rees, C Kamperidis, S Kneip, AJ Gonsalves, SPD Mangles, JG Gallacher, E Brunetti, T Ibbotson, CD Murphy, PS Foster, MJV Streeter, F Budde, PA Norreys, DA Jaroszynski, K Krushelnick, Z Najmudin, SM Hooker

Abstract:

The generation of quasimonoenergetic electron beams, with energies up to 200 MeV, by a laser-plasma accelerator driven in a hydrogen-filled capillary discharge waveguide is investigated. Injection and acceleration of electrons is found to depend sensitively on the delay between the onset of the discharge current and the arrival of the laser pulse. A comparison of spectroscopic and interferometric measurements suggests that injection is assisted by laser ionization of atoms or ions within the channel.
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ATF extraction line laser-wire system

Particle Accelerator Conference 2007: Particle Accelerator Conference, 2007. PAC. IEEE (2008)

Authors:

L Deacon, ST Boogert, GA Blair, G Boorman, A Bosco, P Karataev, Laura Corner, N Delerue, B Foster, F Gannaway, D Howell, M Newman, Armin Reichold, R Senanayake, R Walczak, A Aryshev, H Hayano, K Kubo, N Terunuma, U Urakawa

Abstract:

The ATF extraction line laser-wire (LW) aims to achieve a micron-scale laser spot size and to verify that micron scale beam profile measurements can be performed at the International Linear Collider beam delivery system. Recent upgrades to the LW system are presented together with recent results including the first use of the LW as a beam diagnostic tool.
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Development of a high power fibre laser for laser based electron beam diagnostics

EPAC 2008 - Contributions to the Proceedings (2008) 1359-1361

Authors:

L Corner, LJ Nevay, N Delerue, DF Howell, M Newman, R Walczak, GA Blair, ST Boogert

Abstract:

We present the latest results on the development of a high power fibre laser system for use in a linear collider laser-wire experiment. The laser consists of a solid state oscillator which can be synchronised to an external frequency reference, and two amplification stages in double clad doped fibre, giving 1μJ pulses in a burst mode suitable for a linear collider laser-wire system. This output is amplified in large mode area photonic crystal fibre to generate the high pulse energy necessary for Compton scattering without any deleterious nonlinear effects, whilst maintaining the high spatial mode quality and beam pointing stability of a fibre laser. These properties are essential for producing the sub-micron spot sizes required for the measurement of small particle beam sizes.

Hadronic final states and QCD: Summary

DIS 2008 - Proceedings of the 16th International Workshop on Deep-Inelastic Scattering and Related Topics (2008)

Authors:

T Gehrmann, G Grindhammer, V O'Dell, R Walczak

Abstract:

A summary of new experimental results and recent theoretical developments discussed in the "Hadronic Final States and QCD" working group is presented.
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Measurement of isolated photon production in deep-inelastic scattering at HERA

European Physical Journal C 54:3 (2008) 371-387

Authors:

FD Aaron, A Aktas, C Alexa, V Andreev, B Antunovic, S Aplin, A Asmone, A Astvatsatourov, S Backovic, A Baghdasaryan, P Baranov, E Barrelet, W Bartel, S Baudrand, M Beckingham, K Begzsuren, O Behnke, O Behrendt, A Belousov, N Berger, JC Bizot, MO Boenig, V Boudry, I Bozovic-Jelisavcic, J Bracinik, G Brandt, M Brinkmann, V Brisson, D Bruncko, FW Büsser, A Bunyatyan, G Buschhorn, L Bystritskaya, AJ Campbell, KB Cantun Avila, F Cassol-Brunner, K Cerny, V Cerny, V Chekelian, A Cholewa, JG Contreras, JA Coughlan, G Cozzika, J Cvach, JB Dainton, K Daum, M Deak, Y De Boer, B Delcourt, M Del Degan, J Delvax, A De Roeck, EA De Wolf, C Diaconu, V Dodonov, A Dubak, G Eckerlin, V Efremenko, S Egli, R Eichler, F Eisele, A Eliseev, E Elsen, S Essenov, A Falkiewicz, PJW Faulkner, L Favart, A Fedotov, R Felst, J Feltesse, J Ferencei, L Finke, M Fleischer, A Fomenko, G Franke, T Frisson, E Gabathuler, J Gayler, S Ghazaryan, S Ginzburgskaya, A Glazov, I Glushkov, L Goerlich, M Goettlich, N Gogitidze, S Gorbounov, M Gouzevitch, C Grab, T Greenshaw, BR Grell, G Grindhammer, S Habib, D Haidt, M Hansson, G Heinzelmann, C Helebrant, RCW Henderson, H Henschel, G Herrera, M Hildebrandt

Abstract:

The production of isolated photons in deep-inelastic scattering ep→eγX is measured with the H1 detector at HERA. The measurement is performed in the kinematic range of negative four-momentum transfer squared 450 GeV. The analysis is based on a total integrated luminosity of 227 pb-1. The production cross section of isolated photons with a transverse energy in the range 3
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