Session 8: Low and Intermediate Energy Accelerators and ... - CERN

in many details: Problems in earlier designs were
related with e.g. the detection of light particles and
highly charged ions with different charge states.
Therefore, the deflectors were redesigned completely,
allowing a more flexible positioning of the diagnostics.
In this contribution the final design of the storage ring
is presented and the layout of all elements given. First
results from vacuum measurements in the recently
assembled quarter ring section are summarized.
Type of presentation requested: Poster
Classification: [A07] Electrostatic Accelerators
38-1004 - Electrostatic Charging of an Insulated
Spherical Target by Particle Beam
Boris Yurievich Bogdanovich, Valery Kapin, Alexander
Nesterovich (MEPhI, Moscow)
In the paper [*], the accelerator complex for custom
examinations had been discussed. The complex
consists of RF electron linac and the direct-voltage
proton accelerator. The 2-MeV electron beam used for
the X-ray generation is also utilized for electrostatic
charging of the high-voltage terminal of a proton
accelerator. High-voltage terminal can be constructed
as a large sphere to minimize peak electric field stress.
In this report, the charging process of the spherical
target by electron beam is studied. The particle motion
is described by the classical Coulomb scattering in the
field of the charged sphere. The effects of secondary
emission and resistive divider are included as leakage
currents. The differential equation for the timederivative
of the sphere charge is derived in a nonrelativistic
approach. The time-dependences for the
charge accumulated on sphere and the energy of hitting
electrons are obtained analytically. The final values of
the sphere voltage and the energy of hitting electrons
depend on total value of leakage current. The
numerical model for studying relativistic effects is
outlined. The simulations are performed under
conditions of negligible leakage currents.
* P.Alferov et al., EPAC-98, pp.812-814.
Type of presentation requested: Poster
Classification: [A07] Electrostatic Accelerators
39-122 - A 5 MeV Electron Linac for Radiation
Processing
Antonio Trifirò, Lucrezia Auditore, Renato
Calogero Barnà, Domenico De Pasquale,
Antonio Italiano, Marina Trimarchi (INFN - Gruppo
Messina, S. Agata, Messina)
In recent years, radiation processing is rapidly growing
in various field of industrial treatments and scientific
research as a safe, reliable and economic technique. To
match the requirements of several applications, a 5
MeV, 1 kW electron linac has been developed at the
Dipartimento di Fisica (Università di Messina), in
collaboration with the ENEA Accelerators Group
(Frascati- Rome). This self- containing standing wave
accelerator, driven by a 3 GHz, 2.5 MW Magnetron,
has been designed, by means of the SUPERFISH and
PARMELA codes, in such a way as to obtain an
autofocusing structure, that will be used to develop a
transportable system for 'in-situ' industrial radiography and
X-ray digital tomography. For this accelerator, compact
pulse forming circuits have been properly developed for the
magnetron and the cathode, and pulse frequency can be
varied ranging from 1 to 300 Hz, thus allowing the study of
several applications of radiation processing. Main features
of the accelerating structure, as well as beam spot
dimensions, surface dose distribution and electron beam
energy range will be described.
Type of presentation requested: Poster
Classification: [A08] Linear Accelerators
40-223 - A High Current Deuteron Linac
Petro Olexandrovich Demchenko, Yevgeny Gussev, Mikola
Shulika, Vladimir Sotnikov, Vladimir Voronko (NSC/KIPT,
Kharkov)
On the basis of numeric simulation a deuteron linac
accelerating channel has been calculated and the dynamics
of a beam with average current of 1 mA and particle energy
of 14 MeV has been investigated. The accelerated deuteron
beam may be used both for radio isotope molybdenum 99
production, bombarding natural molybdenum targets, and
for neutron generation by irradiation of a beryllium target.
Beam acceleration and particle focusing are carried out the
same RF electric field of 152.5 MHz frequency and 2% duty
factor. The accelerating channel consists of three sections.
The initial section is a radio frequency quadrupole of 4.7 m
length and injection deuteron energy 100 keV and output
energy of 2 MeV. Another two sections are the interdigital
H cavities with alternating phase focusing. The lengths of
these sections are 3.14 m and 3.8 m and output particle
energies are 6.4 MeV and 14 MeV respectively. Magnet
lenses, in particular quadrupole triplets, are applied only for
beam matching between linac sections. An activation dose
rate map for the linac has been computed in dependence on
linear beam current losses along the channel, time activation
and cooling time after the accelerator stop. The permissible
deuteron beam losses for the given energy range were
determined.
Type of presentation requested: Poster
Classification: [A08] Linear Accelerators
41-224 - Beam Dynamics in 100 MeV S-Band Linac for
CANDLE
Bagrat Grigoryan, Vasili Mkrtich Tsakanov (CANDLE,
Yerevan)
The report presents the results of the beam dynamics study
in 100 MeV S-band linear accelerator foreseen as an injector
for the CANDLE light source. An impact of the excited
longitudinal and transverse wake fields on the particle
energy spread and the beam transverse emittance are given.
Type of presentation requested: Poster
Classification: [A08] Linear Accelerators