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Abstracts Brochure - CERN

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WEPLS023<br />

WEPLS024<br />

WEPLS025<br />

28-Jun-06 16:00 - 18:00 WEPLS — Poster Session<br />

m downstream of the spectrometer magnets permit to determine the beam energy with required resolution. The<br />

main principles of the beam energy measurements based on SR, the numerical simulations of SR performed by the<br />

GEANT code and proposal of SR monitors with submicron resolution are discussed.<br />

The Two-beam Test-stand in CTF3<br />

V.G. Ziemann, T. J. C. Ekelof (UU/ISV) H.-H. Braun, S. Doebert, G.<br />

Geschonke, J.P.H. Sladen, W. Wuensch (<strong>CERN</strong>)<br />

338<br />

The acceleration concept for CLIC, based on<br />

the two-beam acceleration scheme, where<br />

the 30 GHz RF power needed to accelerate<br />

the high energy beam is generated by a high-<br />

intensity but rather low energy drive beam, will be for the first time tested with realistic parameters in the two-beam<br />

test-stand in CTF3. The extreme power levels of up to 600 MW warrant a careful diagnostic system to analyze RF<br />

breakdown by observing the effect on both probe − and drive-beam but also the RF signals and secondary effects<br />

such as emitted light, vibrations, vacuum, and temperatures. We describe the experimental setup and the diagnostic<br />

system planned to be installed in CTF3 for 2007.<br />

Linear Laser Wakefield Acceleration with External Injection<br />

W. van Dijk, G.J.H. Brussaard, W.H. Urbanus, M.J. Van der Wiel,<br />

S.B. van der Geer (TUE)<br />

The Laser Wakefield project at Eindhoven<br />

University seeks to separate three processes<br />

needed for controlled LWFA: Creation of a<br />

plasma channel, injection of electrons and<br />

acceleration of these electrons. This enables control over and optimization of the individual components of the<br />

accelerator. It also removes the need to operate in the non-linear wakefield regime. This allows the use of lower density<br />

plasma regimes without requiring enormous laser intensities. Using front-to-end particle tracking simulations, a<br />

setup has been designed consisting of a RF-photogun, a ’modest’ 2 TW tabletop laser and a pulsed capillary discharge<br />

plasma. Together, these enable the creation of 100 MeV, 1pC bunches with a duration of 10fs. The capabilities of the<br />

setup under construction will be presented. Also the outlook of laser wakefield acceleration with external injection<br />

will be discussed.<br />

Multi-bunch Plasma Wakefield Experiments at the Brookhaven National Laboratory Accelerator<br />

Test Facility<br />

P. Muggli, E.K. Kallos, T.C. Katsouleas (USC) M. Babzien, I. Ben-Zvi,<br />

K. Kusche, P.I. Pavlishin, I. Pogorelsky, D. Stolyarov, V. Yakimenko<br />

(BNL) W.D. Kimura (STI) F. Zhou (UCLA)<br />

In the plasma wakefield accelerator (PWFA),<br />

a short particle bunch or train of bunches<br />

drives a large amplitude relativistic plasma<br />

wave or wake. The wake has both transverse,<br />

focusing fields, and longitudinal fields that<br />

can accelerate trailing particles or a trailing bunch. In this experiment conducted at BNL-ATF, a CO2 laser driven<br />

IFEL modulates the energy of the 65 MeV, 1.5 ps electron bunch, which after a drift creates a train of bunches<br />

approximately 3 fs long, separated by the laser wavelength (10.6 µm or about 30 fs). The largest wake amplitude is<br />

reached when the plasma wavelength is equal to the bunch spacing: n=1·10 19 e-/cc. In this case, the bunch train<br />

drives a wake with an amplitude of approximately 7 GV/m in an ablative capillary discharge plasma. This wake<br />

amplitude is much larger than that previously observed with the un-bunched beam*. With this multi-bunch PWFA

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