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High Energy Polarized Proton Beams

A Modern View

  • Book
  • © 2006

Overview

Authors:
  1. Georg Heinz Hoffstaetter

    1. Department of Physics, Laboratory of Elementary Particle Physics, Cornell University, Ithaca

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Part of the book series: Springer Tracts in Modern Physics (STMP, volume 218)

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Table of contents (5 chapters)

  1. Front Matter

    Pages i-x
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  2. Introduction

    Pages 1-9

  3. Spin Dynamics

    Pages 11-81

  4. First-Order Spin Motion

    Pages 83-124

  5. Higher-Order Spin Motion

    Pages 125-166

  6. Polarized Beams in Other Very-High-Energy Proton Accelerators

    Pages 167-174

  7. Back Matter

    Pages 175-178
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Keywords

About this book

This book deals with the acceleration and storage of polarized proton beams in cyclic accelerators. Polarized proton beams with hundreds of GeV are, for example, essential for resolving the “spin crisis,” i.e., for understanding the angular momentum distribution inside nucleons. Experience with the Relativistic Heavy Ion Collider at the Brookhaven NationalLaboratory(RHICatBNL)hasshownthatpolarizationat205GeV can be obtained, and tests at the pre-accelerating Alternating Gradient S- chrotron(AGS)haveshownthatatleastupto24GeV,thebeampolarization canbequiteundisturbedwhentheacceleratoriswelladjusted,exceptats- cial energies where resonances occur. In particular, it has not been necessary to study closely the variation of the protons’ spin directions across the phase space of the beam. However, at very high energies such as in RHIC, TEVA- TRON, HERA-p, LHC, or a future VLHC, new phenomena can occur that can lead to a signi?cantly diminished beam polarization. For these high energies, it is necessary to look in more detail at the spin motion at each point in phase space, and for this the invariant spin ?eld provestobeausefultool.This?eldgivesrisetoanadiabaticinvariantofsp- orbit motion, and it de?nes the maximum time-average polarization that is usable in a particle physics experiment. Furthermore, the invariant spin ?eld allows the amplitude dependent spin tune to be de?ned and computed and thereby opens the way to a clear evaluation of the e?ects of higher-order spin orbit resonances. In particular, the strengths and the depolarizing e?ects of these resonances can only be determined once the amplitude-dependent spin tune has been computed.

Authors and Affiliations

  • Department of Physics, Laboratory of Elementary Particle Physics, Cornell University, Ithaca

    Georg Heinz Hoffstaetter

About the author

The author teaches Physics at Cornell University and has specialized in the Physics of Beams and Accelerator Technology. He has worked in three internationally important facilities, the laboratory of elementary particle physics (LEPP) that operates the CESR e+/e- collider at Cornell University (New York State), the high energy physics laboratory DESY / Hamburg (Germany) that operates the HERA e/p collider and the nuclear physics facility NSCL / Michigan (USA). Together with colleagues from an international collaboration he has been analyzing the possibility of storing polarized protons at 920 GeV in HERA, a 6.3 km long high-energy accelerator in Hamburg, and in other large particle accelerators.

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