#### Accelerator Physics for the HERA Luminosity Upgrade
When I moved to DESY in 1998,
it had been planned to upgrade the HERA luminosity to
7.5 × 10^{31}/(cm^{2} s), which was 5 times the original design luminosity.
This was to be
achieved by decreasing the proton beam size by moving quadrupoles
closer
to the interaction point and by increasing their strength. Similar
measures
decrease the electron beam size. However, to match the smaller proton
beam size, the horizontal electron emittance additionally has to be
decreased.
Several aspects of electron and proton beam dynamics had to be
considered
in order to allow these changes in HERA.
#### Publications
- Coherent
beam-beam tune shift of unsymmetrical beam-beam interactions with large
beam-beam
parameter,
L. Jin, J. Shi, G. H. Hoffstaetter, Physical Review E 71, 036501 (2005)
- Study
of beam-beam effects in HERA with selfconsistent beam simulations,
J. Shi, L. Jin, G. H. Hoffstaetter, Proceedings of PAC'03, Portland
(May 2003)
- Experiences
with the HERA beams,
G. H. Hoffstaetter, M. Vogt, F. Willeke, ICFA Newsletter (May
2003)
- Report from
the HERA Taskforce on Luminosity Optimization: Theory and First
Luminosity Scans,
M. Dohlus, G. H. Hoffstaetter, M. Lomperski, R. Wanzenberg, Report
DESY-HERA-2003-01 (January 2003)
- Beam-beam
Limit with Hourglass Effect in HERA,
G. H. Hoffstaetter and F. Willeke, Proceedings of EPAC'02, Paris,
France (June 2002)
- Measurement of
HERA's Central RF frequency,
G. H. Hoffstaetter, B. Holzer, F. Willeke, and A. Meseck, Proceedings
of EPAC'02, Paris, France (June 2002)
- Luminosity
Scans at HERA,
G. H. Hoffstaetter, Proceedings of EPAC'02, Paris, France (June 2002)
- Destabilizing
Effect of Linear Coupling in the HERA Proton Ring,
E. Metral, G. H. Hoffstaetter and F. Willeke, Proceedings of EPAC'02,
Paris, France (June 2002)
- Orbit-Response
Matrix Analysis at HERA,
G. H. Hoffstaetter and J. Keil, Proceedings of EPAC'02, Paris, France
(June 2002)
- Bunched
Beam Echoes in the HERA Proton Ring,
I. Agapov, G. H. Hoffstaetter and E. Vogel, Proceedings of EPAC'02,
Paris, France (June 2002)
- Beam based
alignment of combined function
magnets in the upgraded HERA interaction region,
F. Brinker, W. Decking, G. H. Hoffstaetter, J. Keil,
T. Limberg, M. Minty, M. Seidel, R. Wanzenberg, F. Willeke, Proceedings
of EPAC'02, Paris, France (June 2002)
- Beam Based
Alignment of Interaction Region
Magnets,
G. H. Hoffstaetter and F. Willeke, Physical Review ST-AB, Volume 5,
102801 (October
2002)
- The Luminosity
Upgrade of HERA,
G. H. Hoffstaetter for the HERA Luminosity Upgrade Group, Beam
Dynamics Newsletter N0. 24 (April 2001)
- Future HERA High
Luminosity Performance,
G. H. Hoffstaetter and F. Willeke, Proceedings HEACC
(March 2001)
- HERA
Accelerator Studies 2000 ,
Edited by G. H. Hoffstaetter, Report DESY-HERA-00-07
(November 2000)
- HERA Accelerator
Studies,
G. H. Hoffstaetter, Annual HERA Seminar (September 2000)
Corresponding talk
- Future
Possibilities for HERA,
G. H. Hoffstaetter, EPAC 2000, Vienna (June 2000)
Corresponding invited talk
- Electron
Dynamics after the HERA Luminosity Upgrade,
G. H. Hoffstaetter, EPAC 2000, Vienna (June 2000)
Corresponding
poster
- HERA
accelerator studies 1999 ,
Edited by G. H. Hoffstaetter, Report DESY-HERA-00-02
(May 2000)
- New Beam Optics
for HERA-e: Theoretical Investigations and Experimental Tests ,
G. H. Hoffstaetter, Proceedings of the HERA annual seminar, Report
DESY-HERA-99-04 (1999)
- Recent and
past experiences with beam-beam effects
at HERA ,
M. Bieler, E. Gianfelice-Wendt, G. H. Hoffstaetter,
B. Holzer, S. Levonian, T. Limberg, M. Lomperski, M. Minty, Ch. Montag,
R. Wanzenberg, M. Wendt, F. Willeke, K. Wittenburg, Proceedings
of the Beam-beam-effects workshop, CERN (1999)
- Electron dynamics
in the HERA luminosity upgrade lattice of the year 2000,
G. H. Hoffstaetter and F. Willeke, Proceedings of PAC99 (1999)
- HERA machine
studies December 1998 ,
M. Bieler, E. Gianfelice-Wendt, G. H. Hoffstaetter,
B. Holzer, C. Kleffner, T. Limberg, Ch. Montag, A. Meseck, M. Seidel,
F. Solodovnik, M. Wendt, F. Willeke, K. Wittenburg, edited by G.
H. Hoffstaetter, Report DESY-HERA-99-03 (March 1999)
#### Invited Talks
- Beam-Beam
Experience in HERA,
G. H. Hoffstaetter, 2nd EIC workshop, TJNAF, Newport
News (March 2004)
- Electron-ion
collisions and other options for HERA,
G. H. Hoffstaetter, IPPP workshop on future physics
at HERA, Grey College, Durham 2001 (December 2001)
- Lepton
Hadron Colliders,
G. H. Hoffstaetter, Snowmass workshop on the future
of high energy physics 2001,(July 2001)
- Beam-beam
Experiments with HERA's Proton and Electron Beams,
G. H. Hoffstaetter, Snowmass workshop on the future
of high energy physics 2001,(July 2001)
- Future
HERA High Luminosity Performance,
G. H. Hoffstaetter and F. Willeke, HEACC 2001, Tsukuba (March 2001)
- Future
Possibilities for HERA,
G. H. Hoffstaetter, EPAC 2000, Vienna (June 2000)
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