187 research outputs found
Kappa-deformed oscillators, the choice of star product and free kappa-deformed quantum fields
In order to obtain free kappa-deformed quantum fields (with c-number
commutators) we proposed new concept of kappa-deformed oscillator algebra [1]
and the modification of kappa-star product [2], implementing in the product of
two quantum fields the change of standard kappa-deformed mass-shell conditions.
We recall here that the kappa-deformed oscillators recently introduced in
[3]-[5] lie on standard kappa-deformed mass-shell. Firstly, we study
kappa-deformed fields with the standard kappa-star product, what implies that
in the oscillator algebra the corresponding kappa-deformed oscillators lie on
standard kappa-deformed mass-shell. We argue that for the kappa-deformed
algebra of such field oscillators which carry fourmomenta on kappa-deformed
mass-shell it is not possible to obtain the free quantum kappa-deformed fields
with the c-number commutators. Further, we study kappa-deformed quantum fields
with the modified kappa-star product which implies the modification of
kappa-deformed mass-shell. We obtain large class of kappa-deformed statistics
depending on six arbitrary functions which provides the c-number field
commutator functions. Such general class of kappa-oscillators can be described
as the kappa-deformation of standard oscillator algebra obtained by composing
general kappa-deformed multiplication with the deformation of the flip
operator.Comment: 21 pages;v3 more clearly exposed aims and results in the paper; the
version which will appear in Journ.Phys.
MODIFICATION OF THE CENTRAL REGION IN THE RIKEN AVF CYCLOTRON FOR ACCELERATION AT THE H=1 RF HARMONIC
Abstract A highly advanced upgrade plan of the RIKEN AVF cyclotron is under way. The study is focused on the formulation of the new acceleration regimes in the AVF cyclotron by detailed orbit simulations. The extension of the acceleration energy region of light ions towards higher energies in the existing RF harmonic equal to 2 and the modification of the central geometry for the RF harmonic equal to 1 to allow an acceleration of protons at several tens of MeV are considered. The substantial redesign of the central electrode structure is needed to accelerate protons with reasonable values of the dee voltage. The new inflector geometry and the optimized central electrode structure have been formulated for the upgrade
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