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| MOPCH058 |
RF Photogun as Ultra Bright Terahertz Source
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0 |
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- W.P.E.M. Op 't Root, M.J. Loos, O.J. Luiten, M.J. Van der Wiel, T. van Oudheusden, S.B. van der Geer
TUE, Eindhoven
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Recently research into new terahertz (0.3 to 30 THz) light sources has gained a lot of interest. Especially compact sources capable of delivering high peak fields (~ 1 MV/cm), in a short pulse. To achieve this, we will use short relativistic electron bunches, created by photoemission and accelerated in an rf-photogun, to create THz light by means of coherent transition radiation. Because wavelengths smaller and comparable to the bunch length add up coherently, the intensity scales with N2, with N the number of electrons in the bunch. In the first experiments we expect to create THz light pulses with a bandwidth of 1 THz and 1 μJ per pulse. If such a light pulse is focused on a spot of radius 250 μm, this corresponds to peak electrical fields of 1 MV/cm. The eventual goal is to increase the bandwidth of the source, by creating shorter electron bunches. This will be accomplished by choosing a suitable radial laser profile, leading to ellipsoidal electron bunches, which can be focused and compressed very effectively. Eventually this will lead to THz pulses with a bandwidth of 10 THz and energy of 100 μJ. This corresponds to peak electrical fields of 10 MV/cm and higher.
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| MOPCH059 |
From Pancake to Waterbag: Creation of High-brightness Electron Bunches
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- T. van Oudheusden, O.J. Luiten, W.P.E.M. Op 't Root, M.J. Van der Wiel, S.B. van der Geer
TUE, Eindhoven
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Our recent insight is that, when creating high-brightness electron bunches, the major problem is not space charge density itself, but its distribution. Non-linear space charge effects lead to a decrease of brightness. We have a novel recipe of creating waterbag bunches (uniformly charged 3D ellipsoids), which have linear space charge fields. Because of these linear fields we have control of the Coulomb explosion of the bunches. Furthermore, using linear charged particle optics, waterbags can be compressed and focussed with conservation of brightness. Our recent simulations prove that it is possible to create such ideal waterbag bunches in practice. The recipe is to create at the cathode a pancake-like electron bunch with a "hemisphere" charge density distribution. During acceleration this pancake will evolve into a waterbag by its own space charge forces, if two conditions on the acceleration field and the surface charge density are fulfilled. These two conditions are leading to a parameter space, which is explored by simulations. We will present numerical simulations and the present status of the experimental realization.
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| WEPCH051 |
Isochronous Magneto-optical Structure of the Recirculator SALO
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2035 |
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- I.S. Guk, A. Dovbnya, S.G. Kononenko, F.A. Peev, A.S. Tarasenko
NSC/KIPT, Kharkov
- J.I.M. Botman, M.J. Van der Wiel
TUE, Eindhoven
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With the goal to provide low energy spread of electron beam, the magneto-optical structure of the recirculator SALO has been modified. All of its parts (an injection tract and arcs) were made isochronous and achromatic. Besides, with the purpose of the accelerating structure arrangement, the length of straight sections was enlarged. The amplitude and dispersion functions on various recirculator sections and design characteristics of the beam are submitted.
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| WEPLS024 |
Linear Laser Wakefield Acceleration with External Injection
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- W. van Dijk, G.J.H. Brussaard, W.H. Urbanus, M.J. Van der Wiel, S.B. van der Geer
TUE, Eindhoven
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The Laser Wakefield project at Eindhoven University seeks to separate three processes needed for controlled LWFA: Creation of a plasma channel, injection of electrons and acceleration of these electrons. This enables control over and optimization of the individual components of the accelerator. It also removes the need to operate in the non-linear wakefield regime. This allows the use of lower density plasma regimes without requiring enormous laser intensities. Using front-to-end particle tracking simulations, a setup has been designed consisting of a RF-photogun, a 'modest' 2 TW tabletop laser and a pulsed capillary discharge plasma. Together, these enable the creation of 100 MeV, 1pC bunches with a duration of 10fs. The capabilities of the setup under construction will be presented. Also the outlook of laser wakefield acceleration with external injection will be discussed.
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