Verlag des Forschungszentrums Jülich
JUEL-4031
Optimum parameters of the electron cooling system are estimated. The COSY experiment
requirements can be satisfied even when electron cooling time is rather long. That allows to
apply an electron cooling system with circulating electron beam [2] . Such a system has
potentially low cost in comparison with other possibilities. At the energy range from 500 keV
to 1 .5 MeV only longitudinal magnetic field can provide an effective focusing of an intensive
electron beam. The electron beam acceleration can be produced both by induction
acceleration of electrons or using an RF electron LINAC. Specific limitations of such a
cooling system are discussed. Preliminary design of the electron cooling system with
circulating electron beam is described in the report.
This report contains also preliminary program of experiments at LEPTA (Low Energy
Particle Toroidal Accumulator), which are aimed to study the problems of electron cooling
system with circulating electron beam. Presently the construction of LEPTA ring is in the
final stage at JINR and experiments with circulating beam will be started the next year.
Fan, Kuanjun; Maier, Rudolf; Prasuhn, Dieter; Stein, Hans Joachim; Stockhorst, Hans
Electron cooling application for luminosity preservation in an experiment with internal targets at COSY
57 S., 2003
This report is dedicated to investigation of the beam parameter evolution in the experiments
with internal target. In calculations of the proton and deuteron beams we concentrated an
cluster, atomic beam, storage cell and pellet targets at ANKE experiment mainly. In these
calculations electron and stochastic cooling, intrabeam scattering, scattering an the target and
residual gas atoms are taken into account. Beam parameter evolution is investigated in the
long-term time scale, up to one hour, at different beam energies in the range from 1 .0 to
2.7 GeV for proton beam and from 1 to 2 .11 GeV for deuteron beam. The results of numerical
simulations of the proton and deuteron beam parameters at different energies obtained using
new version of BETACOOL program (elaborated at the first stage of this work [1]) are
presented.
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