Dynamics of Polarized Beams
The changes required for accelerating and storing
polarized beams in the proton accelerators at DESY were investigated.
For these studies the particle and spin dynamics program SPRINT was
developed.
The basis of this program is the "stroboscopic average", which is used
to compute invariant subsets of the coupled spin and orbit dynamics.
These
invariants limit the polarization in a proton beam at HERA.
**Publications**
- Adiabatic invariance of spin-orbit motion in
accelerators,
G.H.
Hoffstaetter, H.S. Dumas, J.A. Ellison, Physical Review ST-AB 8, 014001
(2006)
- Observation
of Snake Resonances in RHIC,
M. Bai, H. Huang, W. Mac Kay, V. Ptitsin, T. Roser, S. Tepikian, G.H.
Hoffstaetter, S.Y. Lee, F. Lin, Proceedings PAC05, Knoxville/TN (2005)
- Optimal
Axes of Siberian Snakes for Polarized
Proton Acceleration,
G. H. Hoffstaetter, Physical
Review ST-AB, 7, 121001 (2004)
- Strength
of Higher-Order Spin-Orbit Resonances,
G. H. Hoffstaetter, M. Vogt, Physical Review E 70, 056501 (2004)
- Matching
of Siberian Snakes,
G. H. Hoffstaetter, AIP Proceedings, Ann Arbor (November 2002)
- Accelerator
rings with polarized beams and spin manipulation,
G. H. Hoffstaetter, Lecture for the COSY Summer School (August 2002)
- Adiabatic
Invariants for Spin-Orbit Motion,
G. H. Hoffstaetter, S. Dumas, J. A. Ellison, Proceedings of EPAC'02,
Paris/France (June 2002)
- Polarised
Protons in HERA,
D. Barber, G. H. Hoffstaetter, M. Vogt, Proceedings
of EPAC'02, Paris, France (June 2002)
- Beam
Dynamics Activities at the University of New Mexico,
J. Ellison et al., ICFA Beam Dynamics Newsletter (April 2001)
- Using the
amplitude dependent spin tune to study high order spin-orbit resonances
in storage rings,
D. P. Barber, G. H. Hoffstaetter, and M. Vogt, Proceedings of 14th
International Spin Physics Symposium SPIN00, Osaka, Japan (2000)
- Proton and
electron polarisation in storage rings: some basic concepts,
D. P. Barber, G. H. Hoffstaetter, and M. Vogt, Proceedings of 2nd
Wokshop on Physics with a Polarized-Electron Light-ion
Collider (EPIC), MIT (MA/USA) (2000)
- Higher-order
effects in polarized proton
dynamics,
G. H. Hoffstaetter, M. Vogt, and D. P. Barber, Physical Review ST-AB,
Volume 2, Number 114001 (November 1999)
- Polarized
protons in HERA,
G. H. Hoffstaetter, Nuclear Physics
A666/&667 203c--213c (2000)
- Polarized
protons at HERA: the accelerator
issues,
G. H. Hoffstaetter, Proceedings of the Workshop on Polarized Protons at
High Energies, DESY-PROC-99-03 (1999)
- Numerical and
theoretical spin stability studies
for HERA-p,
D. P. Barber, G. H. Hoffstaetter and M. Vogt, Proceedings of the
Workshop on Polarized Protons at High Energies, Report DESY-PROC-99-03
(1999)
- Nonlinear
spin transfer maps,
C. Weissbaecker and G. H. Hoffstaetter, Proceedings
of the Workshop on Polarized Protons at High Energies, Report
DESY-PROC-99-03 (1999)
- Spin
motion at high energy in HERA-p,
D. P. Barber, G. H. Hoffstaetter, and M. Vogt, In University of
Michigan Report UM-HE-99-05 (1999)
- Snake
matching,
G. H. Hoffstaetter, In University of Michigan Report
UM-HE-99-05 (1999)
- Acceleration of
Polarized Protons to 920 GeV at HERA,
The SPIN Collaboration and the DESY Polarization Team, University of
Michigan Report UM-HE-99-05 (1999)
- The amplitude
dependent spin tune and the invariant
spin field in high energy proton accelerators,
D. P. Barber, G. H. Hoffstaetter, and M. Vogt, Proceedings SPIN98,
Protvino (1998)
- The amplitude
dependent spin tune and the invariant spin field in high energy proton
accelerators,
D. P. Barber, G. H. Hoffstaetter, and M. Vogt, Proceedings of EPAC98
(1998)
Corresponding
poster
- Introduction
to the invariant spin field
and update on simulations with polarized protons at HERA-p,
M. Vogt, D. P. Barber, and G. H. Hoffstaetter, Proceedings of the HERA
annual seminar, Report DESY-HERA-98-04 (1998)
- The
permissible equilibrium polarization distribution
in a stored proton beam,
D. P. Barber, K. Heinemann, G. H. Hoffstaetter, and
M. Vogt, ICFA Proceedings Quantum Aspects of Beam Physics (1998)
- Differential
Algebra for the Computation of Polarization Dynamics,
G. H. Hoffstaetter, unpublished (1998)
- Polarized
protons in HERA - the status,
D. P. Barber, M. Vogt, and G. H. Hoffstaetter, in Report DESY-97-200
(1997) and DESY-Proceedings-1998-01 (1998)
- Higher-order
effects in polarized proton dynamics,
G. H. Hoffstaetter, M. Vogt, and D. P. Barber, DESY-97-161 (1997)
- The
polarization at high energy in HERA,
D. P. Barber, K. Heinemann, G. H. Hoffstaetter, and
M. Vogt, Report DESY-HERA-96-07 and in University of Michigan Report
UM-HE-96-20 (1996)
- Acceleration of
Polarized Protons to 820 GeV at HERA,
The SPIN Collaboration and the DESY Polarization Team, University of
Michigan Report UM-HE-96-20 (1996), (without figures)
- Polarized
protons in HERA,
G. H. Hoffstaetter, Proceedings of SPIN96, Amsterdam
(1996)
- Calculations
of the equilibrium spin distribution
for protons at high energy in HERA,
D. P. Barber, K. Heinemann, G. H. Hoffstaetter, and
M. Vogt, Proceedings of SPIN96, Amsterdam (1996)
- Stroboscopic
averaging for computing the equilibrium spin direction in storage rings,
K. Heinemann and G. H. Hoffstaetter, 1996 unpublished
- The phase space
dependent spin polarization direction in the HERA proton ring at high
energy,
D. P. Barber, K. Heinemann, G. H. Hoffstaetter, and
M. Vogt, Report DESY-M-96-14 and Proceedings EPAC96 (1996)
- Polarized
protons in HERA,
D. P. Barber, K. Heinemann, G. H. Hoffstaetter, and
M. Vogt, in Future Physics at HERA, Volume 2, DESY (1996)
- Tracking
algorithm for the stable spin polarization field in storage rings
using stroboscopic averaging,
K. Heinemann and G. H. Hoffstaetter, Physical Review E 54, 4 (November
1996)
- Polarized
protons in HERA,
G. H. Hoffstaetter, in Report DESY-HERA-96-05 (1996)
**Invited talks**
- Matching of Siberian Snakes,
G. H. Hoffstaetter, Workshop on Polarized Protons in
the AGS, Ann Arbor (November 2002)
- Polarized Particle Beams,
G. H. Hoffstaetter, COSY Summer School, KFA Juelich
(August 2002)
- Polarized
protons in HERA,
G. H. Hoffstaetter, NUCLEON 99, INFN Frascati (June
1999)
- Polarized
protons at HERA: the accelerator issues,
G. H. Hoffstaetter, Workshop on Polarized Protons at
High Energies - Accelerator Challenges and Physics Opportunities,
DESY Hamburg (May 1999)
- Polarized Protons at HERA ,
G. H. Hoffstaetter, APS Meeting, Columbus Ohio (April 1998)
- Polarized protons in HERA,
G. H. Hoffstaetter, 12th International Symposium on
High-Energy Spin Physics (SPIN96), Amsterdam (September 1996)
- Spin Dynamics,
G. H. Hoffstaetter, Mathematical Aspects of Accelerator Physics, Bad
Honnef (9-13 December 1996)
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