DIPAC2011 - List of Keywords (closed-orbit)

Paper	Title	Other Keywords	Page
MOPD11	High Resolution BPM Upgrade for the ATF Damping Ring at KEK	damping, injection, controls, diagnostics	59
	N. Eddy, C.I. Briegel, B.J. Fellenz, E. Gianfelice-Wendt, P.S. Prieto, R. Rechenmacher, A. Semenov, D.C. Voy, M. Wendt, D.H. Zhang Fermilab, Batavia, USA N. Terunuma, J. Urakawa KEK, Ibaraki, Japan
	Funding: Work is supported by the joint high energy physics research program of Japan-USA, and by FNAL, operated by Fermi Research Alliance LLC under contract #DE-AC02-07CH11359 with the US Dept. of Energy. A beam position monitor (BPM) upgrade at the KEK Accelerator Test Facility (ATF) damping ring has been accomplished, carried out by a KEK/FNAL/SLAC collaboration under the umbrella of the global ILC R&D effort. The upgrade consists of a high resolution, high reproducibility read-out system, based on analog and digital down-conversion techniques, digital signal processing, and also implements a new automatic gain error correction schema. The technical concept and realization as well as results of beam studies are presented.

TUPD12	The LHC Beam Position System: Performance during 2010 and Outlook for 2011	pick-up, feedback, injection, vacuum	323
	E. Calvo Giraldo, J.L. Gonzalez, L.K. Jensen, O.R. Jones, T. Lefèvre, J.-J. Savioz, R.J. Steinhagen, J. Wenninger CERN, Geneva, Switzerland
	This paper presents the performance of the LHC Beam Position System during 2010. The system proved to meet most specifications, was highly reliable and continuously provided 25Hz real-time orbit data with micron level resolution to the automatic global orbit feedback system. However, several issues were observed and they will be discussed in detail, such as the dependence on bunch intensity and the effect of surface electronics temperature variations on the measured position.

TUPD71	Combined Approach using Closed-Orbit and Multiturn Data for Model-Independent and Fast Beam Optics Determination in Storage Rings	betatron, storage-ring, optics, dipole	473
	B. Riemann, P. Grete, H. Huck, A. Nowaczyk, T. Weis DELTA, Dortmund, Germany
	Multiturn-capable BPMs have been used successfully for characterization of storage ring beam optics. While their use eases determination of optical parameters (e.g. beta function and phase) by observation of non ring-periodic beam centroid oscillation, the installation of multiturn electronics in all storage ring BPMs causes a high monetary effort. The presented method aims at combining multiturn and closed-orbit measurement methods in a cost-effective way. This is done using a single drift section in the ring, being equipped with two multiturn BPMs at its ends. Measuring the centroid motion in the full transverse phase space, one can completely determine all local beam optics parameters inside the drift space. Then, four additional dipole correctors inside this drift are used to create closed-orbit perturbations along the ring. Because of the known drift optics, it is then possible to extract all data that would be available if all storage ring BPMs were multiturn-capable, by using only closed-orbit BPM data of the mentioned four perturbations (incl. betatron coupling). This fast and model-independent approach may be increased in accuracy by a coupled bunch feedback system.

Paper

Title

Other Keywords

Page

MOPD11

High Resolution BPM Upgrade for the ATF Damping Ring at KEK

damping, injection, controls, diagnostics

59

N. Eddy, C.I. Briegel, B.J. Fellenz, E. Gianfelice-Wendt, P.S. Prieto, R. Rechenmacher, A. Semenov, D.C. Voy, M. Wendt, D.H. Zhang
Fermilab, Batavia, USA
N. Terunuma, J. Urakawa
KEK, Ibaraki, Japan

Funding: Work is supported by the joint high energy physics research program of Japan-USA, and by FNAL, operated by Fermi Research Alliance LLC under contract #DE-AC02-07CH11359 with the US Dept. of Energy.
A beam position monitor (BPM) upgrade at the KEK Accelerator Test Facility (ATF) damping ring has been accomplished, carried out by a KEK/FNAL/SLAC collaboration under the umbrella of the global ILC R&D effort. The upgrade consists of a high resolution, high reproducibility read-out system, based on analog and digital down-conversion techniques, digital signal processing, and also implements a new automatic gain error correction schema. The technical concept and realization as well as results of beam studies are presented.

TUPD12

The LHC Beam Position System: Performance during 2010 and Outlook for 2011

pick-up, feedback, injection, vacuum

323

E. Calvo Giraldo, J.L. Gonzalez, L.K. Jensen, O.R. Jones, T. Lefèvre, J.-J. Savioz, R.J. Steinhagen, J. Wenninger
CERN, Geneva, Switzerland

This paper presents the performance of the LHC Beam Position System during 2010. The system proved to meet most specifications, was highly reliable and continuously provided 25Hz real-time orbit data with micron level resolution to the automatic global orbit feedback system. However, several issues were observed and they will be discussed in detail, such as the dependence on bunch intensity and the effect of surface electronics temperature variations on the measured position.

TUPD71

Combined Approach using Closed-Orbit and Multiturn Data for Model-Independent and Fast Beam Optics Determination in Storage Rings

betatron, storage-ring, optics, dipole

473

B. Riemann, P. Grete, H. Huck, A. Nowaczyk, T. Weis
DELTA, Dortmund, Germany

Multiturn-capable BPMs have been used successfully for characterization of storage ring beam optics. While their use eases determination of optical parameters (e.g. beta function and phase) by observation of non ring-periodic beam centroid oscillation, the installation of multiturn electronics in all storage ring BPMs causes a high monetary effort. The presented method aims at combining multiturn and closed-orbit measurement methods in a cost-effective way. This is done using a single drift section in the ring, being equipped with two multiturn BPMs at its ends. Measuring the centroid motion in the full transverse phase space, one can completely determine all local beam optics parameters inside the drift space. Then, four additional dipole correctors inside this drift are used to create closed-orbit perturbations along the ring. Because of the known drift optics, it is then possible to extract all data that would be available if all storage ring BPMs were multiturn-capable, by using only closed-orbit BPM data of the mentioned four perturbations (incl. betatron coupling). This fast and model-independent approach may be increased in accuracy by a coupled bunch feedback system.