D
D. P. Barber
Researcher at University of Hamburg
Publications - 21
Citations - 357
D. P. Barber is an academic researcher from University of Hamburg. The author has contributed to research in topics: HERA & Spin polarization. The author has an hindex of 8, co-authored 21 publications receiving 345 citations.
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Journal ArticleDOI
The HERA polarimeter and the first observation of electron spin polarization at HERA
D. P. Barber,H.-D. Bremer,M. Böge,R. Brinkmann,W. Brückner,Ch. Büscher,M.S. Chapman,K. J. Coulter,P.P.J. Delheij,M. Düren,E. Gianfelice-Wendt,P.W. Green,H.G. Gaul,H. Gressmann,O. Hausser,O. Hausser,R. Henderson,T. Janke,H. Kaiser,Ralf Kaiser,P. Kitching,Robert Klanner,P. Levy,H.-Ch. Lewin,M. Lomperski,Wolfgang Lorenzon,L. Losev,R. D. McKeown,N. Meyners,B. Micheel,Ross Milner,A. Mücklich,F. Neunreither,W.-D. Nowak,P. M. Patel,K. Rith,Ch. Scholz,E. Steffens,M. Veltri,M. Vetterli,M. Vetterli,W. Vogel,W. Wander,D. Westphal,K. Zapfe,F. Zetsche +45 more
TL;DR: In this paper, the polarimeter, the machine conditions, the data analysis, the first results and plans for future measurements are described, as well as the polarization values close to 60% have been achieved.
Journal ArticleDOI
The first achievement of longitudinal spin polarization in a high energy electron storage ring
D. P. Barber,M. Böge,H.-D. Bremer,R. Brinkmann,W. Brückner,M. Düren,E. Gianfelice-Wendt,C. Großhauser,H. Kaiser,Robert Klanner,M. Lomperski,G. Meyer,N. Meyners,P. Oelwein,G. Ripken,Klaus Rith,G. Schmidt,E. Steffens,W. Wander,W. Wümpelmann,K. Zapfe,F. Zetsche +21 more
TL;DR: A pair of spin rotators has been installed in the electron ring of HERA and up to 65% of the spin polarizations have been reached reproducibly during dedicated measurement time.
Journal ArticleDOI
High spin polarization at the HERA electron storage ring
D. P. Barber,M. Böge,H. Böttcher,H.-D. Bremer,R. Brinkmann,W. Brückner,M. Düren,E. Gianfelice-Wendt,R. Kaiser,Robert Klanner,H.-Ch. Lewin,M. Lomperski,N. Meyners,W.-D. Nowak,P. M. Patel,G. Ripken,Klaus Rith,H.O. Roloff,E. Steffens,D. Westphal,K. Zapfe,F. Zetsche +21 more
TL;DR: In this article, the authors describe the progress made in 1992 towards increasing the vertical electron beam polarization at HERA by using harmonic spin-orbit corrections and beam tuning, and the vertical polarization has been increased from 15% to nearly 60% at a beam energy of 26.7 GeV.
Journal ArticleDOI
Higher-order effects in polarized proton dynamics
TL;DR: In this article, it was shown that the theoretical validity of the first-order theories is restricted at Hadron Electron Ring Accelerator (HERA) energies of up to 820 GeV.
Journal ArticleDOI
Spin transport, spin diffusion and Bloch equations in electron storage rings☆
Klaus Heinemann,D. P. Barber +1 more
TL;DR: In this paper, the Fokker-Planck equation for electrons emitting synchrotron radiation in a storage ring was used to construct an equation of the Bloch type for the polarisation density.