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This book describes the story of how a collaboration of several
hundred physicists from Europe and North America formed in 1988 to
design, construct, install, commission and operate, for the years
1995-2007 the technically innovative HERMES experiment at the DESY
laboratory in Hamburg, Germany to study the spin structure of the
fundamental structure of matter. The authors begin by introducing
the fascinating world of subatomic physics and relate their
personal story of how the HERMES experiment came about. Guided by
the exciting idea to use a new type of target internal to an
electron storage ring, the HERMES collaboration was born to realize
this innovative experimental approach at the new HERA accelerator
at DESY. The book describes the technical design of HERMES; the
successful effort to secure the necessary funds to construct the
experiment in different countries; the fabrication of the different
components by the different HERMES institutes; and the story of the
installation and commissioning of HERMES in the East Hall of HERA
in the hot summer of 1995. Until 2007, when the operation of HERA
ceased, the collider ran typically about 9 months per year
continuously, during which HERMES data taking shifts were manned to
ensure that data of the highest quality were acquired. The book
describes the HERMES scientific results, their considerable impact,
how HERMES shaped an entire generation of young people into
scientific leaders, and ends with a description of the twenty-first
century picture of the proton that has subsequently been
developed.The authors played a leading role within the HERMES
collaboration. They describe, using non-technical language, the
various phases of the thirteen years of running, the social life in
such an international collaboration, and their personal
reminiscences over several decades.
The 9th International Symposium on High Energy Spin Physics was
held in Bonn, 6-15 September 1990, with the Physikalisches Institut
der Universitat Bonn as the host. The symposium was preceded by a
series of four workshops on * polarized electron sources and
electron spin polarimeters * Siberian snakes and polarization in
circular machines * polarized gas targets * polarized solid
targets. 160 participants from 11 countries, among them many young
physicists, came together and discussed mainly technological spin
problems. The high level of participation indicates that workshops
combined with the symposium are attractive not only for people who
plan and prepare polarized beams and targets but also for
experimentalists and theorists dealing with high energy spin
physics. At these workshops many very interesting and important
recent results were presented and reviewed. Thus we hope these
proceedings will be valuable to many researchers in these fields.
The Organizing Committee would like to thank all participants, in
particular the speakers and the session chairmen, for their
contributions to the workshops and for helping to create a lively
and stimulating atmosphere. Special thanks go to the organizers -
W. Haeberli, S. Mango, E. Reichert, E. Steffens, W. Thiel, U.
Wienands - for their cooperation in preparing and running these
workshops. We gratefully acknowledge the enthusiastic help of the
members of our institute in preparing and running the conference
and the workshops, especially Mrs. D. FaSbender, Mrs. E. Wendorf,
Mrs. J. Wetzel, and Dr. U.Idschok.
A comprehensive survey of the most recent results from the field of
quark-gluon structure of the nucleon, in particular how the spin of
the nucleon is shared by its constituents. After very intriguing
results from CERN and SLAC at the end of the 1980s, the last decade
has seen a set of second-generation experiments at high energy
accelerators that have yielded precise information on the solution
of the 'Spin Crisis' - as well as opening up new questions. The
articles are written by experts from the leading collaboration and
theory groups as well as providing an expert summary of the state
of the art, the book points the way to future research directions.
Its main focus is on semi-inclusive and exclusive measurements of
deep inelastic lepton scattering, which enables for the first time
the determination of the flavor-separated quark spin distributions.
Future developments on generalized parton distributions and their
interpretation as well as the transverse spin structure are also
covered. An indispensable volume for all working in hadronic
physics.
A comprehensive survey of the most recent results from the field of
quark-gluon structure of the nucleon, in particular how the spin of
the nucleon is shared by its constituents. After very intriguing
results from CERN and SLAC at the end of the 1980s, the last decade
has seen a set of second-generation experiments at high energy
accelerators that have yielded precise information on the solution
of the 'Spin Crisis' - as well as opening up new questions. The
articles are written by experts from the leading collaboration and
theory groups as well as providing an expert summary of the state
of the art, the book points the way to future research directions.
Its main focus is on semi-inclusive and exclusive measurements of
deep inelastic lepton scattering, which enables for the first time
the determination of the flavor-separated quark spin distributions.
Future developments on generalized parton distributions and their
interpretation as well as the transverse spin structure are also
covered. An indispensable volume for all working in hadronic
physics.
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