Abstracts Brochure - CERN

WEPLS035
WEPLS036
WEPLS037
28-Jun-06 16:00 - 18:00 WEPLS — Poster Session
case are revealed. They reduce to low Q-factor of the resonator for strong relativistic electrons and to nonlinear waveparticle
interaction for weakly relativistic electron bunches.
*I. Onishchenko et al. Proc. of EPAC’04, 5-9 July, Lucerne, Switzerland, p.770.**T. C. Marshall et al. AIP Conf. Proc.
2001, No. 569, p. 316.
X-rays from Pyroelectric Accelerator
In the present paper we describe experimen-
A.V. Shchagin, V.I. Nagaychenko (NSC/KIPT)
tal observation of spectra of x-ray radiation
produced in thin target by electrons accelerated
in pyroelectric accelerator. The pyroelectric accelerator operates due to heating or cooling of pyroelectric crystal
in ambient gas*. The spectra contain continue bremsstrahlung with maximum energy reaching about 100 keV and
peaks of characteristic X-ray radiation. Spectra were measured at gas pressure 1-30 mTorr and different height, square,
and surface state of pyroelectric crystal. Results of measurements are discussed.
*J. D. Brownridge. Pyroelectric X-ray generator. Nature 358 (1992) 287.
3D Analysis of Wake Field Excitation in Planar Dielectric Resonator
G.V. Sotnikov, I.N. Onishchenko (NSC/KIPT) T.C. Marshall (Columbia
University)
342
Dielectric-lined structures are promise for
generation strong wake field by train of electron
bunches. For increasing of wake field
amplitude, it is proposed to use the dielec-
tric resonator. Principles of the resonator concept of the dielectric wake field accelerator we reported recently*. They
were based on 2D analysis and at neglect of influence of the drift vacuum channel on eigen frequencies of the dielectric
resonator. In the present work we report the results of 3D analysis of excitation wake field in slab-symmetric
dielectric-loaded resonator. The total set of solutions containing as solenoidal and potential parts electromagnetic
field consists of LSM and LSE modes. Every of LSM and LSE modes contains odd (symmetrical in transverse direction
to the dielectric plates) and even (anti-symmetrical) waves. The numerical analysis of wake field excitation by the
symmetric electron bunches is carried out. Influence of the drift vacuum channel on wake field amplitude and on
coherent summation of wake field of periodic train of bunches in the dielectric resonator is studied. Comparison of
the obtained results with the investigations carried out earlier in 2D approach is made.
*T. C. Marshall et al. Proc. of VI Int. Workshop “Strong microwaves in plasmas”, Russia, July 25 – August 1, 2005.
P.S52.
Analytical and Numerical Calculations for the Transport of Intense Pulsed Beams in the
Cylindrically Symmetric Electrostatic Fields
The transport of the intense pulsed beams
J.-Q. Lu (PKU/IHIP)
in the cylindrically symmetric electrostatic
fields was analyzed with the Lie algebraic
method. The Gaussian and uniform particle distributions in the (x, y, z) 3-D ellipsoid was used in the analysis. The
beam transverse dimensions can be asymmetrical. Because the space charge forces depend on the particle motions,
and the particle motions are related to the space charge forces also, to get more correct results, the electrostatic lenses