7 papers
Spin tune in the single resonance model with a pair of Siberian Snakes
D. P. Barber, R. Jaganathan, M. Vogt
Snake ``resonances'' are classified in terms of the invariant spin field and the amplitude dependent spin tune. Exactly at snake ``resonance'' there is no continuous invariant spin…
V. The Semiclassical Foldy-Wouthuysen Transformation and the Derivation of the Bloch Equation for Spin-1/2 Polarised Beams Using Wigner Functions
K. Heinemann, D. P. Barber
A semiclassical Foldy--Wouthuysen transformation of the Dirac equation is used to obtain the radiationless Bloch equation for the polarisation density.
IV. Unruh Effect, Spin Polarisation and the Derbenev-Kondratenko Formalism
D. P. Barber
The relationship between the level of spin polarisation caused by Unruh radiation as calculated by Bell and Leinaas and that obtained from the Derbenev-Kondratenko formalism is exp…
III. The Permissible Equilibrium Polarisation Distribution in a Stored Proton Beam
D. P. Barber, K. Heinemann, G. H. Hoffstaetter +1
We illustrate the use of the invariant spin field for describing permissible equilibrium spin distributions in high energy spin polarised proton beams.}
II. Longitudinal Electron Spin Polarisation at 27.5 GeV in HERA
D. P. Barber
The first attainment of longitudinal spin polarisation in a high energy electron (positron) storage ring is described.
Acceleration and Storage of Polarized Electron Beams
D. P. Barber
I review recent developments in spin dynamics in electron storage rings and accelerators.