This list of contributions is sorted by session number. (Alternative view of contributions list)

Number of contributions : 21.

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SESSION 2 -  Requirements on a Mutli-TeV plasma wave accelerator

No.1  Abstract  submitted by Pukhov Alexander to session 2 The best possible scalings for LWFA: similarity theory and 3D PIC results A.Pukhov, S.Gordienko .

No.2  Abstract  submitted by Faure Jerome to session 2 On accelerator size and multistaging J. Faure I will present a very simple model showing how a multistage accelerator is necessary for reducing the size of a laser-plasma TeV accelerator. Optimal conditions are obtained for untrapped orbits and the total size of the accelerator scales as N^{-1/2}, where N is the number of plasma stages. This presentation can hold on a few viewgraphs and could serve as an introduction to this session.

No.3  Abstract  submitted by Pukhov Alexander to session 2 Similarity theory and the best possible scalings for LWFA Alexander Pukhov, Sergei Gordienko A similarity theory is developed for ultra- relativistic laser-plasmas. It is shown that the interaction depends on the dimensionless similarity parameter $S=n_e/n_cr a$ rather than separately on the laser amplitude $a$ and the plasma density $n_e/n_cr$. In the limit of underdense plasmas, $S<<1 $, we are able to find the optimal scalings for laser wake field electron acceleration. The strong message of the present work is that the bubble acceleration regime [see Pukhov, Meyer-ter-Vehn, Appl. Phys. B, {f 74}, 355 (2002)] satisfies these optimal scalings. Comment: The presentation could be placed in the morning session 2b on Thursday, June 9.

SESSION 3 -  Characteristics of the beam accelerated in a plasma acceleration cell

No.4  Abstract  submitted by Reitsma Albert to session 3 Beam loading - LWFA energy spread and efficiency Albert Reitsma In this talk, methods for maximising laser pulse to electron bunch energy conversion and minimising energy spread are investigated, and it is shown that an inherent trade-off between the two exists.

No.5  Abstract  submitted by Reitsma Albert to session 3 Transverse dynamics Albert Reitsma The subject of this presentation is emittance growth and matching of externally injected electron bunches in laser wakefield accelerators. Coupling between transverse and longitudinal motion of electrons is investigated. A regime is found in which the self-wakefield of the e-bunch suppresses the beam breakup instability.

No.6  Abstract  submitted by Hooker Simon to session 3 Gas-Filled Capillary Discharge Waveguides S. M. Hooker, A. J. Gonsalves and T. Rowlands-Rees The use of gas-filled capillary discharge waveguides to guide high-intensity laser pulses will be reviewed, and their potential application in laser-driven plasma accelerators will be discussed.

No.7  Abstract  submitted by Andreev Nikolay to session 3 LWFA using guided propagation of laser pulses in capillaries N.E. Andreev, B. Cros, P. Mora The guided propagation of short intense laser pulses and wakefield generation are analyzed and optimized for the real parameters of future experiments. To describe the long distance propagation of an intense laser pulse in gas filled capillaries the set of basic equations was used with allowance made for the finite pulse length effects, plasma formation due to tunnel ionization of a gas, atomic electron and relativistic effects, and laser energy losses due to optical field ionization and transmission through the capillary walls. The efficient generation of a regular wake field over long distances suitable for the laser wakefield accelerators is shown.

No.8  Abstract  submitted by Geissler Michael to session 3 3D-PIC Simulations of few-cycle bubble acceleration Michael Geissler, Jörg Schreiber, Florian Grüner and Jürgen Meyer-ter-Vehn We present here 3D-PIC simulations of Laser Electron Acceleration in the bubble regime. Focusing on few- cycle high power pulses we discuss characteristic properties of the accelerated electron bunch like number of particles, energy, energy spread and emittance depending on various laser and plasma parameter. Also the transport of the electron pulse out of the plasma will be discussed

SESSION 4 -  Conceptual design of high energy accelerator using plasmas

No.9  Abstract  submitted by Giulietti Danilo to session 4 PLASMONX: combining high energy electron bunches and super intense laser pulses in plasmas Danilo Giulietti, on the behalf of PLASMONX team The aim of this project is to provide LNF with a world-class, high- power laser facility suitable for the development of an innovative, high-gradient acceleration technique based upon super- intense and ultra-short laser pulses, and X/gamma-ray tunable sources, using Thomson scattering of optical photons by energetic electrons. The facility will be built in close interaction with the SPARC project presently in progress at LNF. The main purpose of the facility will consist in R&D activity aimed at the following objectives: 1) demonstration of high-gradient acceleration of electrons injected into electron plasma waves excited by ultra-short, high power laser pulses; 2) development of a monochromatic and tuneable X-ray source in the 20-1000 keV range, based upon Thomson Scattering of laser pulses by relativistic electrons.

No.10  Abstract  submitted by Lotov Konstantin to session 4 Efficient operating mode of the plasma wakefield accelerator K.V.Lotov A new operating mode of the plasma wakefield accelerator is found at which high efficiency of the driver-to-witness energy exchange can be achieved simultaneously with high transformer ratio and low energy spread. The efficient acceleration is realized in the blowout regime with a high-current moderate- length driver, if the most part of the driver and the whole witness are inside the cavern, and the beams are shaped to flatten the profile of the longitudinal electric field. The efficient regime can be demonstrated with state-of-the-art electron beams, but requires a longitudinal compression of the drive beam, high density plasma, and precise control of driver and witness shapes.

No.11  Abstract  submitted by Lotov Konstantin to session 4 Numerical optimization of a plasma wakefield acceleration experiment K.V.Lotov, V.S.Tikhanovich The possibility of high acceleration rates has already been demonstrated by plasma wakefield accelerators driven by electron beams. The next necessary step is obviously the demonstration of high acceleration efficiency and good quality of the beam. One possible way to achieve both the efficiency and quality is to prepare matched drive and accelerated beams by removing a central slice from a single high- quality electron bunch (parent beam). For parameters of the parent beam given, the question arises how to maximize the number and energy of accelerated particles and minimize their energy spread and emittance. This question is addressed by LCODE numerical simulations. As a reference point, the design beam parameters of VEPP-5 injection complex are taken. Optimum shape of the beams, required plasma length, achievable energy gain and energy spread are found as functions of the plasma density and parent beam characteristics. The required control accuracy of adjustable beam and plasma parameters is determined.

No.12  Abstract  submitted by Nakajima Kazuhisa to session 4 A conceptual design of the single stage multi-TeV electron-positron pair beam collider Kazuhisa Nakajima Availability of multi-PW to EW class lasers will make it possible to reduce a huge complex system of multistage electron-positron colliders to a single-stage all-in-one system. Relativistic ultrahigh laser fields can produce plasmas through interaction with matter, and accelerate laser-produced electrons and ions to generate a relativistic electron beam and energetic ions in plasmas. This process will be followed by creation of electron-positron pairs in plasma under a strong laser field. A conceptual design of multi-TeV collider using laser-plasma produced pair-beams is investigated for the plasma-based system consisting of nonlinear laser wakefiled accelerators and plasma lens final focusing, and for the laser-based system consisting of ponderomotive acceleration and focusing scheme.

No.13  Abstract  submitted by Reitsma Albert to session 4 Injection in front of the laser pulse Albert Reitsma Preliminary results for external e-bunch injection in front of the laser pulse are discussed. Advantages and problems of the scheme are highlighted

No.14  Abstract  submitted by Andreev Nikolay to session 4 Monoenergetic acceleration in LWFA N.E. Andreev, S.V. Kuznetsov The different schemes of an electron bunch injection and compression to provide monoenergetic electron acceleration to high energies are analyzed. Analytical study is confirmed by the results of numerical modelling.

No.15  Abstract  submitted by van Goor Fred to session 4 Conceptual design of a laser wakefield experiment with external bunch injection in front of the laser pulse. Arsen Khachatryan, Fred van Goor, Mark Luttikhof, Arie Irman, Jeroen Verschuur, Bert Bastiaens, and Klaus Boller At Twente University we are designing a Laser Wakefield experiment to demonstrate a novel external bunch injection scheme where the bunch is injected in a plasma channel in front of the laser pulse. A conceptual design of the experiment and results of numerical simulations are presented. The numerical simulations show that starting with a sub- picosecond, few MeV electron bunch from a photo injector, one can generate a few femtosecond duration e-bunch with average energies of a few hundred MeV’s with this injection method.

SESSION 5 -  Shorter term projects

No.16  Abstract  submitted by Yakimenko Vitaly to session 5 Terrawatt CO2 laser status and nonlinear compton experiment at ATF Vitaly Yakimenko Igor Pogorelsky The presentation will include capabilities at ATF for the plasma based acceleration experiments including compressed electron beam ant terawatt/picoseconds level CO2 laser. Recent results will be discussed and details on angular distribution of the nonlinear Compton scattering measurement will be presented.

No.17  Presentation  submitted by Mora Patrick to session 5 Laser wakefield acceleration by petawatt ultrashort laser pulses L. M. Gorbunov, S. Yu. Kalmykov, P. Mora Laser wakefield acceleration by petawatt ultrashort laser pulses: numerical simulations with the fully relativistic time-averaged particle code WAKE.

No.18  Abstract  submitted by Kando Masaki to session 5 Status of laser based electron acceleration experiments at JAERI Masaki Kando, on behalf of 100TW laser operation and experiment teams Progress and present status of electron acceleration experiments using 20fs, 100 TW laser at JAERI are described. Sharp gas-vacuum boundary enhances electron injection to the wake field. Slowly decreasing density profile along the laser propagation helps to increase the energy gain. The possibility to produce such a density profile by a supersonic gas jet is also discussed.

No.19  Abstract  submitted by Petrenko Alexey to session 5 Design of an Experiment on 500 MeV Beam Plasma Acceleration at Budker INP A. V. Burdakov, A. M. Kudryavtsev, P. V. Logatchov, K. V. Lotov, A. V. Petrenko and A. N. Skrinsky The project of an experimental facility based upon the VEPP-5 injection complex at Budker INP is described. Due to a good quality of electron beam and special beam preparation system based on arc bunch compressor the facility opens several possibilities for studies of the plasma wakefield acceleration: high peak beam currents, arbitrary beam profiles, and long term beam-plasma interaction (up to the full driver depletion). End-to-end simulations of the beam dynamics are presented. Due to nonlinear effects in the bunch compressor the peak beam current is limited to 3 kA. Coherent synchrotron radiation in magnets appears to be an important issue for maximum compression ratio resulting in many-fold increase of the initial beam emmitance.

No.20  Abstract  submitted by Nakajima Kazuhisa to session 5 The next step proposal : Frontier Laser Acceleration Science on High-quality Quantum Beams (FLASH-QUBE) Kazuhisa Nakajima The next step of advanced accelerator researches will be focused on high quality electron beam generation and acceleration up to GeV energies on a table top with mono energetic, small emittance, femto- to atto-second beams. These researches lead to new generation of femtosecond coherent X-ray and Teraherz radiations useful for currently vital nano-material sciences and life sciences, and to preparation for TeV range super high energy colliders in the long term.

No.21  Abstract  submitted by Malka Victor to session 5 Laser plasma accelerator facility Victor Malka Few MeV to few GeV highly-charged and quasi- monoenergetic electron beam will be produced in the near future with current laser technology. The original properties of these beams permit to envisage new science and new applications. A project on compact laser plasma accelerator is proposed. This facility will have two missions (i) to provide electron beam to users from a different domains (medical, chemist, accelerator, nuclear physics and material science), and (ii) to extend the electron beam energy up to few GeV well adapted for XFEL applications. This dedicated facility will pave the direction for higher energy plasma based accelerators.