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Abstracts Brochure - CERN

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WEPLS035<br />

WEPLS036<br />

WEPLS037<br />

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

case are revealed. They reduce to low Q-factor of the resonator for strong relativistic electrons and to nonlinear waveparticle<br />

interaction for weakly relativistic electron bunches.<br />

*I. Onishchenko et al. Proc. of EPAC’04, 5-9 July, Lucerne, Switzerland, p.770.**T. C. Marshall et al. AIP Conf. Proc.<br />

2001, No. 569, p. 316.<br />

X-rays from Pyroelectric Accelerator<br />

In the present paper we describe experimen-<br />

A.V. Shchagin, V.I. Nagaychenko (NSC/KIPT)<br />

tal observation of spectra of x-ray radiation<br />

produced in thin target by electrons accelerated<br />

in pyroelectric accelerator. The pyroelectric accelerator operates due to heating or cooling of pyroelectric crystal<br />

in ambient gas*. The spectra contain continue bremsstrahlung with maximum energy reaching about 100 keV and<br />

peaks of characteristic X-ray radiation. Spectra were measured at gas pressure 1-30 mTorr and different height, square,<br />

and surface state of pyroelectric crystal. Results of measurements are discussed.<br />

*J. D. Brownridge. Pyroelectric X-ray generator. Nature 358 (1992) 287.<br />

3D Analysis of Wake Field Excitation in Planar Dielectric Resonator<br />

G.V. Sotnikov, I.N. Onishchenko (NSC/KIPT) T.C. Marshall (Columbia<br />

University)<br />

342<br />

Dielectric-lined structures are promise for<br />

generation strong wake field by train of electron<br />

bunches. For increasing of wake field<br />

amplitude, it is proposed to use the dielec-<br />

tric resonator. Principles of the resonator concept of the dielectric wake field accelerator we reported recently*. They<br />

were based on 2D analysis and at neglect of influence of the drift vacuum channel on eigen frequencies of the dielectric<br />

resonator. In the present work we report the results of 3D analysis of excitation wake field in slab-symmetric<br />

dielectric-loaded resonator. The total set of solutions containing as solenoidal and potential parts electromagnetic<br />

field consists of LSM and LSE modes. Every of LSM and LSE modes contains odd (symmetrical in transverse direction<br />

to the dielectric plates) and even (anti-symmetrical) waves. The numerical analysis of wake field excitation by the<br />

symmetric electron bunches is carried out. Influence of the drift vacuum channel on wake field amplitude and on<br />

coherent summation of wake field of periodic train of bunches in the dielectric resonator is studied. Comparison of<br />

the obtained results with the investigations carried out earlier in 2D approach is made.<br />

*T. C. Marshall et al. Proc. of VI Int. Workshop “Strong microwaves in plasmas”, Russia, July 25 – August 1, 2005.<br />

P.S52.<br />

Analytical and Numerical Calculations for the Transport of Intense Pulsed Beams in the<br />

Cylindrically Symmetric Electrostatic Fields<br />

The transport of the intense pulsed beams<br />

J.-Q. Lu (PKU/IHIP)<br />

in the cylindrically symmetric electrostatic<br />

fields was analyzed with the Lie algebraic<br />

method. The Gaussian and uniform particle distributions in the (x, y, z) 3-D ellipsoid was used in the analysis. The<br />

beam transverse dimensions can be asymmetrical. Because the space charge forces depend on the particle motions,<br />

and the particle motions are related to the space charge forces also, to get more correct results, the electrostatic lenses

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