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

4-381 - About Low Energy Ions Storing
Alexander Tarasenko, Ivan Guk, Stanislav Kononenko,
Anatoliy Paschenko, Ivan Shapoval, Vladimir Yuferov
(NSC/KIPT, Kharkov)
The influence of a neutral gas target on the low energy
hydrogen isotope ion beam settled energy spread and
beam lifetime is considered. It is shown, that a main
factor, which determines the circulating beam lifetime,
is the ion neutralization on internal target atoms. The
estimations of various ways of ionization have shown,
that the ionization with plasma target is the most
effective. The ratio of the neutral and plasma target
densities, when complete beam ionization and all
oscillation types damping are provided, is found. The
way of creation in the store ring plasma target with
high degree of ionization is offered. Its influence on
focusing properties of magnetooptical structure is
designed. The magnetic structure of 150 KeV tritium
ions storage ring and calculated for it the focusing
functions, which satisfy requirements to such
installation, are given. The received results for a special
case of the tritium ions storing allow make conclusion
that the offered idea of the low energy ions store can be
sold in principle and technically. One of such storage
ring possible application may be research on driven
fusion.
Type of presentation requested: Poster
Classification: [A04] Low- and Intermediate-Energy
Circular Accelerators
5-404 - Redesign of the ISIS Main Magnet Power
Supply Storage Choke
Andrew Kimber, James Gray (CCLRC/RAL/ISIS,
Chilton, Didcot, Oxon)
The ISIS facility, based at the Rutherford Appleton
Laboratory in the UK, provides intense pulsed neutron
and muon beams for condensed matter studies. As part
of the facilities upgrade and refurbishment program,
the 1MJ storage choke which forms part of the main
magnet power supply system, will be replaced with a
number of smaller units. The present storage choke,
which consists of a split secondary winding
transformer, is incorporated into a series-parallel
resonant circuit known as the 'white circuit'. This
circuit ensures that each magnet receives identical
currents, but is not subjected to excessive voltages.
Although the storage choke is essentially a transformer,
its secondary magnetising inductance is relatively low
and a precisely defined value. This paper discusses the
design and development of ten smaller units which will
eventually replace the present equipment, and the
testing of a one fifth scale model, which will be used to
prove the technology.
Type of presentation requested: Poster
Classification: [A04] Low- and Intermediate-Energy
Circular Accelerators
6-418 - Particle Dynamics in the Low Energy Positron
Toroidal Accumulator: First Experiments and Results
Grigory Troubnikov, Viktor Antropov, Evgeny Boltushkin,
Vladimir Bykovsky, Alexander Ivanov, Sergey Ivashkevich,
Andrey Kobets, Iourii Korotaev, Vyacheslav Lohmatov, Igor
Meshkov, Dmitry Monahov, Valentin Pavlov, Roman Pivin,
Igor Alekseevich Seleznev, Anatoly Olegovich Sidorin,
Alexander Smirnov, Evgeny Syresin, Sergey Yakovenko
(JINR, Dubna, Moscow Region)
The project of Low Energy Particle Toroidal Accumulator
(LEPTA) is dedicated to construction of a positron storage
ring with electron cooling of positrons circulating in the
ring. Such a peculiarity of the LEPTA enables it
automatically to be a generator of positronium (Ps) atoms,
which appear in recombination of positrons with cooling
electrons inside the cooling section of the ring. The project
has a few goals: to study electron and positron dynamics in
the ring (particle motion in the horizontal and vertical planes
are coupled contrary to of classic cycle accelerators), to set
up first experiments with Ps in flight; Magnetic
measurements of main LEPTA elements are performed.
Several elements : kicker, injection system of electron beam,
helical quadrupole, septum magnet are tested and expected
design parameters were achieved for those elements. The
investigations of electron beam dynamics are started. First
results of experiments with circulating electron beam are
presented and discussed in this article. Several beam
diagnostic methods for studying of strong coupled motion of
charged particles are proposed and tested.
Type of presentation requested: Poster
Classification: [A04] Low- and Intermediate-Energy
Circular Accelerators
7-446 - Beam Cooling ar S-LSR
Akira Noda, Hicham Fadil, Shinji Fujimoto, Masahiro
Ikegami, Toshiyuki Shirai, Takeshi Takeuchi, Mikio Tanabe
(ICR Kyoto, Kyoto), Hiromi Okamoto, Yosuke Yuri
(HU/AdSM, Higashi-Hiroshima), Hiromu Tongu
(ICR/NSRF, Kyoto), Igor Meshkov, Evgeny Syresin (JINR,
Dubna, Moscow Region), Manfred Grieser (MPI-K,
Heidelberg), Koji Noda, Shinji Shibuya (NIRS, Chiba-shi)
S-LSR is an ion accumulation and cooler ring with the
circumference and maximum magnetic rigidity of 22.589 m
and 1.0T.m, respectively. Electron beam cooling will be
applied for laser-produced hot ion beam after phase rotation.
Electron cooler for S-LSR is now under construction and the
beam simulation is also going on. Laser cooling of Mg ion
with low energy (35 keV) is also planned in 3-dimensional
way with use of Synchro-Betatron coupling.so as to realize
ultra cold beam. Cancellation of shear force due to orbitlength
difference in the dipole section is to be studied with
use of overlapping of the radial electric field inversely
proportional to the curvature radius with the uniform
vertical magnetic field. Possible experiments to approach to
ultra-cold beam is also to be studied by computer simulation