Abstracts Brochure - CERN

TUPCH — Poster Session 27-Jun-06 16:00 - 18:00
Acceleration of Beam from a DC Thermionic Gun Using a PWT Linac and Transmission
through an Undulator
A 2µsecond, 40 keV beam from a DC
thermionic electron gun has been accelerated
to 3.5 MeV using a 21 cm, 4-cell,
Plane Wave Transformer (PWT) linac struc-
K.K. Pant, B. Biswas, S.K. Gupta, P.J. Jain, U.K. Kale, S. Krishnagopal,
V. Kumar, S. Lal, P.N. Nerpagar (RRCAT)
ture with around 3 MW of RF power. Current measurements using a Fast Current Transformer (FCT) after a bending
magnet energy spectrometer show a peak current of around 12 mA at 3.5 MeV. We discuss these results and the
results of further experiments to transmit the beam through the undulator that has been designed and built for the
Compact Ultrafast TErahertz Free-Electron Laser (CUTE-FEL). We also discuss other experiments to accelerate beam
to higher energy in two 4-cell PWT structures.
Dipole Stabilizing Rods System for a Four-vane RFQ: Modeling and Measurements on the
TRASCO RFQ Aluminum Model at LNL
The Dipole Stabilizing Rods (DSR’s) are devices
used in order to reduce a priori the ef- F. Grespan, A. Palmieri, A. Pisent (INFN/LNL)
fect of perturbation on the operating mode of
a four-vane RFQ caused by neighboring dipole modes by increasing the frequency spacing between the TE210 mode
and dipole modes, without, in principle, affecting the quadrupole TE210 mode. They have proven to be particularly
useful in the case of coupled RFQ’s whose overall length is significantly greater than the operating wavelength. In this
article we present a circuit model of such DSR’s, that, used in combination with a transmission line model of a four
vane RFQ, has allowed us to predict the dimensioning of the DSR’s in the case of the aluminum model of TRASCO
RFQ. The DSR parameters and, in general, the accuracy of the model have been also confirmed by HFSS simulations
and by RF measurements on the above-mentioned model.
Improvement of Co-based Amorphous Core for Untuned Broadband RF Cavity
We have developed a cobalt-based amorphous
core as a new magnetic-alloy (MA) A. Sugiura, M. Kanazawa, T. Misu (NIRS)
core for the loaded RF cavity. Because of its
permeability found to be approximately twice as high as that of FINEMET, this MA core is an excellent candidate
for constructing a compact broadband RF cavity with less power consumption. In this report, we present our recent
studies of the Co-based amorphous core’s physical properties and performance. Improvement of the new core coated
by new materials surface of ribbon is also described.
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