LINAC2012 - List of Authors (Schulte, D.)

Paper	Title	Page
SUPB007	On-Line Dispersion Free Steering for the Main Linac of CLIC	13
	J. Pfingstner, D. Schulte CERN, Geneva, Switzerland
	For future linear colliders as well as for light sources, ground motion effects are a severe problem for the accelerator performance. After a few minutes, orbit feedback systems are not sufficient to mitigate all ground motion effects and additional long term methods will have to be deployed. In this paper, the long term ground motion effects in the main linac of the Compact Linear Collider (CLIC) are analysed via simulation studies. The primary growth of the projected emittance is identified to originate from chromatic dilutions due to dispersive beam orbits. To counter this effect, an on-line identification algorithm is applied to measure the dispersion parasitically. This dispersion estimate is used to correct the beam orbit with an iterative dispersion free steering algorithm. The presented results are not only of interest for the CLIC project, but for all linacs in which the dispersive orbit has to be corrected over time.

SUPB008	Specifications of the Distributed Timing System for the CLIC Main Linac	16
	A. Gerbershagen, A. Andersson, D. Schulte CERN, Geneva, Switzerland P. Burrows JAI, Oxford, United Kingdom F.Ö. Ilday Bilkent University, Bilkent, Ankara, Turkey
	The longitudinal phase stability of CLIC main and drive beams is a crucial element of CLIC design. In order to measure and to control the phase, a distributed phase monitoring system has been proposed. The system measures the beam phase every 900 m. The relative phase between the measurement points is synchronized with an external reference system via a chain of reference lines. This paper presents the simulations of error propagation in the proposed distributed monitoring system and the impact on the drive and main beam phase errors and the luminosity. Based on the results the error tolerances for the proposed system are detailed.

MOPB042	On-line Dispersion Free Steering for the Main Linac of CLIC	267
	J. Pfingstner, D. Schulte CERN, Geneva, Switzerland
	For future linear colliders as well as for light sources, ground motion effects are a severe problem for the accelerator performance. After a few minutes, orbit feedback systems are not sufficient to mitigate all ground motion effects and additional long term methods will have to be deployed. In this paper, the long term ground motion effects in the main linac of the Compact Linear Collider (CLIC) are analysed via simulation studies. The primary growth of the projected emittance is identified to originate from chromatic dilutions due to dispersive beam orbits. To counter this effect, an on-line identification algorithm is applied to measure the dispersion parasitically. This dispersion estimate is used to correct the beam orbit with an iterative dispersion free steering algorithm. The presented results are not only of interest for the CLIC project, but for all linacs in which the dispersive orbit has to be corrected over time.

MOPB045	Specifications of the Distributed Timing System for the CLIC Main Linac	273
	A. Gerbershagen, A. Andersson, D. Schulte CERN, Geneva, Switzerland P. Burrows JAI, Oxford, United Kingdom F.Ö. Ilday Bilkent University, Bilkent, Ankara, Turkey
	The longitudinal phase stability of CLIC main and drive beams is a crucial element of CLIC design. In order to measure and to control the phase, a distributed phase monitoring system has been proposed. The system measures the beam phase every 900 m. The relative phase between the measurement points is synchronized with an external reference system via a chain of reference lines. This paper presents the simulations of error propagation in the proposed distributed monitoring system and the impact on the drive and main beam phase errors and the luminosity. Based on the results the error tolerances for the proposed system are detailed.

THPB091	Machine Protection Issues and Solutions for Linear Accelerator Complexes	1032
	M. Jonker, H. Schmickler, R. Schmidt, D. Schulte CERN, Geneva, Switzerland M.C. Ross SLAC, Menlo Park, California, USA
	The workshop “Machine Protection focusing on Linear Accelerator Complexes” was held from 6-8 June 2012 at Cern. This workshop brought together experts working on machine protection systems for accelerator facilities with high brilliance or large stored beam energies, with the main focus on linear accelerators and their injectors. An overview of the machine protection systems for several accelerators was given. Beam loss mechanisms and their detection were discussed. Mitigation of failures and protection systems were presented. This paper summarises the workshop and reviews the current state of the art in machine protection systems.

Paper

Title

Page

On-Line Dispersion Free Steering for the Main Linac of CLIC

13

J. Pfingstner, D. Schulte
CERN, Geneva, Switzerland

For future linear colliders as well as for light sources, ground motion effects are a severe problem for the accelerator performance. After a few minutes, orbit feedback systems are not sufficient to mitigate all ground motion effects and additional long term methods will have to be deployed. In this paper, the long term ground motion effects in the main linac of the Compact Linear Collider (CLIC) are analysed via simulation studies. The primary growth of the projected emittance is identified to originate from chromatic dilutions due to dispersive beam orbits. To counter this effect, an on-line identification algorithm is applied to measure the dispersion parasitically. This dispersion estimate is used to correct the beam orbit with an iterative dispersion free steering algorithm. The presented results are not only of interest for the CLIC project, but for all linacs in which the dispersive orbit has to be corrected over time.

SUPB008

Specifications of the Distributed Timing System for the CLIC Main Linac

16

A. Gerbershagen, A. Andersson, D. Schulte
CERN, Geneva, Switzerland
P. Burrows
JAI, Oxford, United Kingdom
F.Ö. Ilday
Bilkent University, Bilkent, Ankara, Turkey

The longitudinal phase stability of CLIC main and drive beams is a crucial element of CLIC design. In order to measure and to control the phase, a distributed phase monitoring system has been proposed. The system measures the beam phase every 900 m. The relative phase between the measurement points is synchronized with an external reference system via a chain of reference lines. This paper presents the simulations of error propagation in the proposed distributed monitoring system and the impact on the drive and main beam phase errors and the luminosity. Based on the results the error tolerances for the proposed system are detailed.

MOPB042

On-line Dispersion Free Steering for the Main Linac of CLIC

267

J. Pfingstner, D. Schulte
CERN, Geneva, Switzerland

For future linear colliders as well as for light sources, ground motion effects are a severe problem for the accelerator performance. After a few minutes, orbit feedback systems are not sufficient to mitigate all ground motion effects and additional long term methods will have to be deployed. In this paper, the long term ground motion effects in the main linac of the Compact Linear Collider (CLIC) are analysed via simulation studies. The primary growth of the projected emittance is identified to originate from chromatic dilutions due to dispersive beam orbits. To counter this effect, an on-line identification algorithm is applied to measure the dispersion parasitically. This dispersion estimate is used to correct the beam orbit with an iterative dispersion free steering algorithm. The presented results are not only of interest for the CLIC project, but for all linacs in which the dispersive orbit has to be corrected over time.

MOPB045

Specifications of the Distributed Timing System for the CLIC Main Linac

273

A. Gerbershagen, A. Andersson, D. Schulte
CERN, Geneva, Switzerland
P. Burrows
JAI, Oxford, United Kingdom
F.Ö. Ilday
Bilkent University, Bilkent, Ankara, Turkey

The longitudinal phase stability of CLIC main and drive beams is a crucial element of CLIC design. In order to measure and to control the phase, a distributed phase monitoring system has been proposed. The system measures the beam phase every 900 m. The relative phase between the measurement points is synchronized with an external reference system via a chain of reference lines. This paper presents the simulations of error propagation in the proposed distributed monitoring system and the impact on the drive and main beam phase errors and the luminosity. Based on the results the error tolerances for the proposed system are detailed.

THPB091

Machine Protection Issues and Solutions for Linear Accelerator Complexes

1032

M. Jonker, H. Schmickler, R. Schmidt, D. Schulte
CERN, Geneva, Switzerland
M.C. Ross
SLAC, Menlo Park, California, USA

The workshop “Machine Protection focusing on Linear Accelerator Complexes” was held from 6-8 June 2012 at Cern. This workshop brought together experts working on machine protection systems for accelerator facilities with high brilliance or large stored beam energies, with the main focus on linear accelerators and their injectors. An overview of the machine protection systems for several accelerators was given. Beam loss mechanisms and their detection were discussed. Mitigation of failures and protection systems were presented. This paper summarises the workshop and reviews the current state of the art in machine protection systems.